Construction and Building Materials最新文献_第4页

Double-shell TiO2@SiO2 hollow spheres for enhanced thermal insulation in architectural coatings 双壳TiO2@SiO2空心球，用于增强建筑涂料的隔热性能

IF 8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials

Pub Date : 2026-01-29 DOI: 10.1016/j.conbuildmat.2026.145413

Xiaoqiang Qi , Siyao Guo , Huanjun Lv , Zhiqing Jia

The escalating global energy consumption, driven primarily by the growing demand for building temperature regulation exacerbated by the greenhouse effect and urban heat island phenomena, necessitates the development of high-performance thermal insulation materials. Conventional hollow or reflective coatings are often limited by inadequate near-infrared scattering, elevated thermal conductivity resulting from excessive wall thickness, and deficient ultraviolet stability. To overcome these drawbacks, we developed double-shell heterogeneous hollow microspheres (H-TiO₂@SiO₂) featuring a TiO₂ inner shell and a SiO₂ outer shell through a modified Stöber method. This hierarchical design effectively integrates the complementary functions of both shells: the TiO₂ inner layer provides efficient broad-spectrum light reflection, while the SiO₂ outer layer offers robust ultraviolet shielding and enhances thermal insulation. H-TiO₂@SiO₂ demonstrate superior optical and thermal properties, achieving a high light reflectance of 93.67 % and a low thermal conductivity of 0.068 W/(m·K), respectively. Incorporated into architectural coatings, these microspheres markedly improve thermal regulation performance, yielding a surface temperature reduction of up to 8.3 °C relative to unmodified coatings. Moreover, the SiO₂ shell endows coatings with excellent ultraviolet ageing resistance. Furthermore, the coatings exhibit excellent compatibility with foam concrete, resulting in a composite material with significantly enhanced thermal insulation (an 18.4 % reduction in thermal conductivity) and improved water resistance. This study presents a novel strategy for designing multifunctional thermal insulation fillers, offering considerable potential for curbing building energy consumption and promoting sustainable construction practices.

温室效应和城市热岛现象加剧了建筑温度调节需求的增长，推动了全球能源消耗的不断升级，这就要求开发高性能保温材料。传统的中空或反射涂层通常受到近红外散射不足、过高的壁厚导致的热导率升高以及紫外线稳定性不足的限制。为了克服这些缺点，我们通过改进的Stöber方法开发了具有TiO2内壳和SiO2外壳的双壳非均质空心微球（H-TiO2@SiO2）。这种分层设计有效地整合了两个外壳的互补功能：TiO2内层提供高效的广谱光反射，而SiO2外层提供强大的紫外线屏蔽和增强隔热。H-TiO2@SiO2具有优异的光学和热性能，具有93.67 %的高反射率和0.068 W/（m·K）的低导热系数。加入到建筑涂料中，这些微球显著提高了热调节性能，与未改性的涂料相比，表面温度降低了8.3°C。此外，SiO2外壳赋予涂层优异的抗紫外线老化性能。此外，涂层与泡沫混凝土表现出优异的相容性，从而使复合材料的隔热性能显著增强（导热系数降低18.4 %），并提高了耐水性。本研究提出了一种设计多功能隔热填料的新策略，为抑制建筑能耗和促进可持续建筑实践提供了相当大的潜力。

{"title":"Double-shell TiO2@SiO2 hollow spheres for enhanced thermal insulation in architectural coatings","authors":"Xiaoqiang Qi , Siyao Guo , Huanjun Lv , Zhiqing Jia","doi":"10.1016/j.conbuildmat.2026.145413","DOIUrl":"10.1016/j.conbuildmat.2026.145413","url":null,"abstract":"<div><div>The escalating global energy consumption, driven primarily by the growing demand for building temperature regulation exacerbated by the greenhouse effect and urban heat island phenomena, necessitates the development of high-performance thermal insulation materials. Conventional hollow or reflective coatings are often limited by inadequate near-infrared scattering, elevated thermal conductivity resulting from excessive wall thickness, and deficient ultraviolet stability. To overcome these drawbacks, we developed double-shell heterogeneous hollow microspheres (H-TiO<sub>2</sub>@SiO<sub>2</sub>) featuring a TiO<sub>2</sub> inner shell and a SiO<sub>2</sub> outer shell through a modified Stöber method. This hierarchical design effectively integrates the complementary functions of both shells: the TiO<sub>2</sub> inner layer provides efficient broad-spectrum light reflection, while the SiO<sub>2</sub> outer layer offers robust ultraviolet shielding and enhances thermal insulation. H-TiO<sub>2</sub>@SiO<sub>2</sub> demonstrate superior optical and thermal properties, achieving a high light reflectance of 93.67 % and a low thermal conductivity of 0.068 W/(m·K), respectively. Incorporated into architectural coatings, these microspheres markedly improve thermal regulation performance, yielding a surface temperature reduction of up to 8.3 °C relative to unmodified coatings. Moreover, the SiO<sub>2</sub> shell endows coatings with excellent ultraviolet ageing resistance. Furthermore, the coatings exhibit excellent compatibility with foam concrete, resulting in a composite material with significantly enhanced thermal insulation (an 18.4 % reduction in thermal conductivity) and improved water resistance. This study presents a novel strategy for designing multifunctional thermal insulation fillers, offering considerable potential for curbing building energy consumption and promoting sustainable construction practices.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"513 ","pages":"Article 145413"},"PeriodicalIF":8.0,"publicationDate":"2026-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146070899","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Nanoindentation-based multidimensional deconvolution framework for gel-phase creep characterization and loading protocol optimization in fly ash–based geopolymers 基于纳米压痕的凝胶相蠕变表征多维反褶积框架及粉煤灰基地聚合物加载方案优化

IF 8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials

Pub Date : 2026-01-29 DOI: 10.1016/j.conbuildmat.2026.145374

Wenrui Xu , Youjun Xie , Zhuo Tang , Yinuo Guo , Guangcheng Long , Fan Wang , Gang Peng

This study develops a three-dimensional Gaussian mixture model (3D-GMM) framework and corresponding nanoindentation loading protocols for gel-phase creep characterization in fly ash–based geopolymers. The optimal cluster number of 3D-GMM was found to be 4, enabling the identification of the gel phase, which is characterized by an by an elastic modulus (E) of 14–19 GPa, hardness (H) of 0.6–0.7 GPa, and creep modulus (C) of 140–230 GPa in this study. A clear correlation among E, H, and C is revealed by the correlation analysis, indicating coupled elastic, plastic, and viscoelastic responses that likely originate from a common microstructural mechanism. Backscattered electron imaging analysis confirms the accuracy of the 3D-GMM phase identification, with gel-phase fractions showing good agreement with image-based estimates . Further analysis reveals that a holding duration of 180 s provides a balance between stable results and minimized environmental noise. A holding load of 10 mN offers a suitable compromise between bulk representativeness and substrate effects, whereas 2 mN is more appropriate for probing isolated gel phases. Based on these findings, a standardized nanoindentation workflow is proposed, integrating parameter selection, data quality control, 3D-GMM deconvolution, statistical analysis, and microstructural validation. This framework improves the robustness of nanoindentation data and provides a systematic methodology for characterizing heterogeneous geopolymer systems.

本研究开发了三维高斯混合模型（3D-GMM）框架和相应的纳米压痕加载方案，用于粉煤灰基地聚合物的凝胶相蠕变表征。发现3D-GMM的最佳簇数为4，可以识别凝胶相，该凝胶相在本研究中具有弹性模量(E)为14-19 GPa，硬度(H)为0.6-0.7 GPa，蠕变模量(C)为140-230 GPa。相关性分析揭示了E、H和C之间的明显相关性，表明耦合的弹性、塑性和粘弹性响应可能源于共同的微观结构机制。后向散射电子成像分析证实了3D-GMM相识别的准确性，凝胶相分数与基于图像的估计显示出良好的一致性。进一步的分析表明，保持180 s的持续时间可以在稳定的结果和最小化的环境噪声之间取得平衡。保持负载为10 mN提供了体积代表性和底物效应之间的适当折衷，而2 mN更适合探测分离的凝胶相。基于这些发现，提出了一个标准化的纳米压痕工作流程，包括参数选择、数据质量控制、3D-GMM反褶积、统计分析和微观结构验证。该框架提高了纳米压痕数据的稳健性，并为表征非均相地聚合物体系提供了系统的方法。

{"title":"Nanoindentation-based multidimensional deconvolution framework for gel-phase creep characterization and loading protocol optimization in fly ash–based geopolymers","authors":"Wenrui Xu , Youjun Xie , Zhuo Tang , Yinuo Guo , Guangcheng Long , Fan Wang , Gang Peng","doi":"10.1016/j.conbuildmat.2026.145374","DOIUrl":"10.1016/j.conbuildmat.2026.145374","url":null,"abstract":"<div><div>This study develops a three-dimensional Gaussian mixture model (3D-GMM) framework and corresponding nanoindentation loading protocols for gel-phase creep characterization in fly ash–based geopolymers. The optimal cluster number of 3D-GMM was found to be 4, enabling the identification of the gel phase, which is characterized by an by an elastic modulus (<em>E</em>) of 14–19 GPa, hardness (<em>H</em>) of 0.6–0.7 GPa, and creep modulus (<em>C</em>) of 140–230 GPa in this study. A clear correlation among <em>E</em>, <em>H</em>, and <em>C</em> is revealed by the correlation analysis, indicating coupled elastic, plastic, and viscoelastic responses that likely originate from a common microstructural mechanism. Backscattered electron imaging analysis confirms the accuracy of the 3D-GMM phase identification, with gel-phase fractions showing good agreement with image-based estimates . Further analysis reveals that a holding duration of 180 s provides a balance between stable results and minimized environmental noise. A holding load of 10 mN offers a suitable compromise between bulk representativeness and substrate effects, whereas 2 mN is more appropriate for probing isolated gel phases. Based on these findings, a standardized nanoindentation workflow is proposed, integrating parameter selection, data quality control, 3D-GMM deconvolution, statistical analysis, and microstructural validation. This framework improves the robustness of nanoindentation data and provides a systematic methodology for characterizing heterogeneous geopolymer systems.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"513 ","pages":"Article 145374"},"PeriodicalIF":8.0,"publicationDate":"2026-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146070904","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The effect of bamboo macro-cellulose fibers on the early age properties of UHPC: In situ formation of multi-scale fiber system 竹大纤维素纤维对UHPC早期老化性能的影响：多尺度纤维体系的原位形成

IF 8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials

Pub Date : 2026-01-29 DOI: 10.1016/j.conbuildmat.2026.145414

Xuzhe Zhang , Yuxuan Chen , Qian Deng , Yuting Wang , Jiaqi Ren , Mingyang Chen , Qingliang Yu

Cellulosic fiber is a green and lightweight bio-fiber that has been utilized in high performance concrete for crack and shrinkage control. The most utilized cellulosic fiber used in modern concrete is nanocellulose fiber (NCF), featuring high aspect ratio and water retention ability. However, the high specific surface area and micro-size of NCF lead to a more viscos UHPC paste, increasing the defects due to low self-compactness. Inspired by the high ductility of bamboo, a new type of bamboo macro-cellulose fiber (BCF) extracted from bamboo stem is developed and shows high tensile strength and low surface area. Moreover, it shows the ability to form multi-scale fibers in-situ during UHPC preparation. The developed BCF is expected to obtain the advantages of NCF and also possess crack bridging effect simultaneously. Hence, this study investigates the influence of bamboo derived BCF on the early age properties of UHPC, and compares it with traditional NCF. The results indicate that UHPC incorporating BCF exhibits superior overall performance compared to that containing NCF, including a 47.18 % reduction in viscosity, an 11.84 % increase in compressive strength, and a 14.02 % improvement in flexural strength. Additionally, it demonstrates flowability closer to that of plain UHPC, less pronounced delayed hydration, and a finer, denser pore structure. In summary, BCF derived from bamboo exhibits the best performance in UHPC mechanical properties, showing promising potential for its application in green and high performance cementitious materials.

纤维素纤维是一种绿色轻质的生物纤维，已被用于高性能混凝土的裂缝和收缩控制。现代混凝土中使用最多的纤维素纤维是纳米纤维素纤维（NCF），它具有高长径比和保水能力。然而，NCF的高比表面积和微尺寸导致UHPC膏体粘度更高，增加了自密实度低的缺陷。利用竹子的高延展性，从竹茎中提取出一种新型的竹宏纤维素纤维（BCF），具有高抗拉强度和低比表面积的特点。此外，在UHPC制备过程中，还显示出原位形成多尺度纤维的能力。开发后的BCF可望在取得NCF的优点的同时，又具有裂缝的桥接作用。因此，本研究考察了竹源性BCF对UHPC早期性能的影响，并将其与传统NCF进行了比较。结果表明，与含NCF的UHPC相比，含BCF的UHPC表现出更好的综合性能，包括粘度降低47.18% %，抗压强度提高11.84 %，抗弯强度提高14.02 %。此外，它的流动性更接近普通UHPC，延迟水化不明显，孔隙结构更细、更致密。综上所述，竹基BCF在UHPC力学性能方面表现最佳，在绿色高性能胶凝材料方面具有广阔的应用前景。

{"title":"The effect of bamboo macro-cellulose fibers on the early age properties of UHPC: In situ formation of multi-scale fiber system","authors":"Xuzhe Zhang , Yuxuan Chen , Qian Deng , Yuting Wang , Jiaqi Ren , Mingyang Chen , Qingliang Yu","doi":"10.1016/j.conbuildmat.2026.145414","DOIUrl":"10.1016/j.conbuildmat.2026.145414","url":null,"abstract":"<div><div>Cellulosic fiber is a green and lightweight bio-fiber that has been utilized in high performance concrete for crack and shrinkage control. The most utilized cellulosic fiber used in modern concrete is nanocellulose fiber (NCF), featuring high aspect ratio and water retention ability. However, the high specific surface area and micro-size of NCF lead to a more viscos UHPC paste, increasing the defects due to low self-compactness. Inspired by the high ductility of bamboo, a new type of bamboo macro-cellulose fiber (BCF) extracted from bamboo stem is developed and shows high tensile strength and low surface area. Moreover, it shows the ability to form multi-scale fibers in-situ during UHPC preparation. The developed BCF is expected to obtain the advantages of NCF and also possess crack bridging effect simultaneously. Hence, this study investigates the influence of bamboo derived BCF on the early age properties of UHPC, and compares it with traditional NCF. The results indicate that UHPC incorporating BCF exhibits superior overall performance compared to that containing NCF, including a 47.18 % reduction in viscosity, an 11.84 % increase in compressive strength, and a 14.02 % improvement in flexural strength. Additionally, it demonstrates flowability closer to that of plain UHPC, less pronounced delayed hydration, and a finer, denser pore structure. In summary, BCF derived from bamboo exhibits the best performance in UHPC mechanical properties, showing promising potential for its application in green and high performance cementitious materials.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"513 ","pages":"Article 145414"},"PeriodicalIF":8.0,"publicationDate":"2026-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146070895","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Rapid and effective healing for surface-initiated deep cracks of mortar by electromagnetic-driven magnetic liquid metal strategy 电磁驱动磁性液态金属策略快速有效修复砂浆表面深层裂缝

IF 8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials

Pub Date : 2026-01-29 DOI: 10.1016/j.conbuildmat.2026.145446

Yuchao Gao , Han Wang , Jianyu Xu , Rui Liang , Yali Li , Chuanxiu Wang , Zeyu Lu , Jinyang Jiang

Conventional strategies to repair concrete with surface cracks are usually time-consuming and hardly to heal the surface-initiated deep cracks. In this study, a novel electromagnetic-driven magnetized liquid metals (EM-MLMs) strategy was proposed to heal surface and deep cracks in mortar rapidly and effectively. Experimental results indicated that with the help of magnetic induction, the MLM droplets (1 mm) deformed adaptively in the cracks of half their size (500 μm) and extended to a deeper region within 2.7 s. The overlapped electric field helped to reduce the surface tension of intruded MLM droplets, which can better wet the crack surface and realize the deep crack fully filled after solidification of MLM. Compared to the conventional strategies of cement grout injection and epoxy sealing, the EM-MLMs strategy further improved the compressive strength of cracked mortar by 31 % post-repair and achieved near-complete healing (healing ratios > 99 %) for deep cracks at the depth of 20 mm. Notably, this novel strategy also reduced the average repair duration from 20 to 4.3 mins, representing a 71 % reduction in remediation time. In conclusion, the EM-MLMs strategy has great potential to advance the repair efficiency for cracked concrete, which contributes to protect existing constructions from further damage and structure failure.

传统的混凝土表面裂缝修复方法既耗时又难以修复表面深层裂缝。本研究提出了一种新型电磁驱动磁化液态金属（EM-MLMs）策略，用于快速有效地修复砂浆表面和深层裂缝。实验结果表明，在磁感应作用下，MLM液滴（1 mm）在其一半尺寸（500 μm）的裂纹中自适应变形，并在2.7 s内扩展到更深的区域。重叠电场有助于降低侵入的MLM液滴的表面张力，从而更好地湿润裂纹表面，实现MLM凝固后深层裂纹的充分填充。与传统的水泥灌浆和环氧树脂密封策略相比，EM-MLMs策略进一步提高了裂缝砂浆的抗压强度，修复后的抗压强度提高了31% %，并且在深度为20 mm的深裂缝中实现了近乎完全的愈合（愈合率>； 99 %）。值得注意的是，这种新策略还将平均修复时间从20分钟减少到4.3 分钟，代表修复时间减少了71 %。总之，EM-MLMs策略有很大的潜力来提高裂缝混凝土的修复效率，这有助于保护现有建筑免受进一步的破坏和结构破坏。

{"title":"Rapid and effective healing for surface-initiated deep cracks of mortar by electromagnetic-driven magnetic liquid metal strategy","authors":"Yuchao Gao , Han Wang , Jianyu Xu , Rui Liang , Yali Li , Chuanxiu Wang , Zeyu Lu , Jinyang Jiang","doi":"10.1016/j.conbuildmat.2026.145446","DOIUrl":"10.1016/j.conbuildmat.2026.145446","url":null,"abstract":"<div><div>Conventional strategies to repair concrete with surface cracks are usually time-consuming and hardly to heal the surface-initiated deep cracks. In this study, a novel electromagnetic-driven magnetized liquid metals (EM-MLMs) strategy was proposed to heal surface and deep cracks in mortar rapidly and effectively. Experimental results indicated that with the help of magnetic induction, the MLM droplets (1 mm) deformed adaptively in the cracks of half their size (500 μm) and extended to a deeper region within 2.7 s. The overlapped electric field helped to reduce the surface tension of intruded MLM droplets, which can better wet the crack surface and realize the deep crack fully filled after solidification of MLM. Compared to the conventional strategies of cement grout injection and epoxy sealing, the EM-MLMs strategy further improved the compressive strength of cracked mortar by 31 % post-repair and achieved near-complete healing (healing ratios > 99 %) for deep cracks at the depth of 20 mm. Notably, this novel strategy also reduced the average repair duration from 20 to 4.3 mins, representing a 71 % reduction in remediation time. In conclusion, the EM-MLMs strategy has great potential to advance the repair efficiency for cracked concrete, which contributes to protect existing constructions from further damage and structure failure.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"513 ","pages":"Article 145446"},"PeriodicalIF":8.0,"publicationDate":"2026-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146070966","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental study on the disintegration characteristics of hydrophobic polymer-modified waste mud 疏水聚合物改性废泥崩解特性的实验研究

IF 8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials

Pub Date : 2026-01-29 DOI: 10.1016/j.conbuildmat.2026.145417

Pan Ding , Menghuan Chen , Shaoheng He , Minjie Wen , Riqing Xu , Yongsheng Song , Houren Xiong

Engineering waste mud is commonly generated during construction activities. Improper disposal or indiscriminate piling of this waste may pose significant risks to environmental geology. An eco-friendly hydrophobic polymer can be used as an effective additive for soil reinforcement, and the modified soil has the potential to be reused as infrastructure materials. This study investigates the disintegration characteristics of hydrophobic polymer-modified mud soil under climate-induced conditions, such as flooding or rainfall. Soil slaking tests were conducted to investigate the effects of the polymer treatment on soil immersion disintegration resistance. Wetting-drying (WD) cycle tests were carried out to investigate the effects of the polymer treatment and the number of WD cycles on mechanical strength and microstructural evolution. The digital image correlation (DIC) technique was used to examine the effect of the polymer treatment on the deformation patterns of the specimens. The results indicated that: (1) The polymer significantly enhanced the soil’s disintegration resistance to disintegration under complete immersion conditions. The disintegration ratio decreased from 92.9 % to 44.3 %, as the additive dosage increased from 0 % to 5 %. (2) The polymer-modified soil exhibited better resistance to strength deterioration under WD cycles, with a strength loss of 9.0 % for the modified soil (reinforced with 5 % hydrophobic polymer) compared to the untreated soil after 7 cycles. (3) Microstructural analysis demonstrated that the polymer reduced porosity and increased microstructural integrity by filling soil pores and cementing particles while mitigating WD damage. Papilla-like structures resembling the micro/nanostructures on the natural lotus leaf were observed, which are believed to enhance the water resistance of the soil. This research provides valuable insights into the use of hydrophobic polymer for improving waste mud and the potential reuse of modified mud in geological and geotechnical engineering.

工程废泥通常是在建筑活动中产生的。不当处置或随意堆放这些废物可能对环境地质构成重大风险。一种生态友好的疏水聚合物可以作为土壤加固的有效添加剂，改性后的土壤具有重复利用作为基础设施材料的潜力。本研究探讨了气候条件下疏水聚合物改性泥土的崩解特性，如洪水或降雨。通过土壤溶蚀试验研究了聚合物处理对土壤浸水抗崩解能力的影响。进行了干湿循环试验，研究了聚合物处理和干湿循环次数对材料机械强度和微观结构演变的影响。采用数字图像相关（DIC）技术研究了聚合物处理对试件变形模式的影响。结果表明：(1)聚合物显著增强了土壤在完全浸没条件下的抗崩解能力。随着添加剂用量从0 %增加到5 %，崩解率从92.9 %下降到44.3 %。(2)聚合物改性土在WD循环下表现出更强的抗强度劣化能力，7次循环后，改性土（添加5 %疏水聚合物加固）的强度损失比未处理土大9.0 %。(3)微观结构分析表明，聚合物通过填充土壤孔隙和胶结颗粒来降低孔隙度，提高微观结构完整性，同时减轻WD损伤。观察到类似于天然荷叶的微/纳米结构的乳头状结构，认为这可以增强土壤的抗水性。该研究为利用疏水聚合物改善废泥浆以及改性泥浆在地质和岩土工程中的潜在再利用提供了有价值的见解。

{"title":"Experimental study on the disintegration characteristics of hydrophobic polymer-modified waste mud","authors":"Pan Ding , Menghuan Chen , Shaoheng He , Minjie Wen , Riqing Xu , Yongsheng Song , Houren Xiong","doi":"10.1016/j.conbuildmat.2026.145417","DOIUrl":"10.1016/j.conbuildmat.2026.145417","url":null,"abstract":"<div><div>Engineering waste mud is commonly generated during construction activities. Improper disposal or indiscriminate piling of this waste may pose significant risks to environmental geology. An eco-friendly hydrophobic polymer can be used as an effective additive for soil reinforcement, and the modified soil has the potential to be reused as infrastructure materials. This study investigates the disintegration characteristics of hydrophobic polymer-modified mud soil under climate-induced conditions, such as flooding or rainfall. Soil slaking tests were conducted to investigate the effects of the polymer treatment on soil immersion disintegration resistance. Wetting-drying (WD) cycle tests were carried out to investigate the effects of the polymer treatment and the number of WD cycles on mechanical strength and microstructural evolution. The digital image correlation (DIC) technique was used to examine the effect of the polymer treatment on the deformation patterns of the specimens. The results indicated that: (1) The polymer significantly enhanced the soil’s disintegration resistance to disintegration under complete immersion conditions. The disintegration ratio decreased from 92.9 % to 44.3 %, as the additive dosage increased from 0 % to 5 %. (2) The polymer-modified soil exhibited better resistance to strength deterioration under WD cycles, with a strength loss of 9.0 % for the modified soil (reinforced with 5 % hydrophobic polymer) compared to the untreated soil after 7 cycles. (3) Microstructural analysis demonstrated that the polymer reduced porosity and increased microstructural integrity by filling soil pores and cementing particles while mitigating WD damage. Papilla-like structures resembling the micro/nanostructures on the natural lotus leaf were observed, which are believed to enhance the water resistance of the soil. This research provides valuable insights into the use of hydrophobic polymer for improving waste mud and the potential reuse of modified mud in geological and geotechnical engineering.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"513 ","pages":"Article 145417"},"PeriodicalIF":8.0,"publicationDate":"2026-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146070898","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Mechanism of bio-carbonation on leaching behavior: a case study of coal gasification slag-based binder 生物碳化对浸出行为的影响机理：以煤气化渣基粘结剂为例

IF 8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials

Pub Date : 2026-01-29 DOI: 10.1016/j.conbuildmat.2026.145441

Junchen Xiang , Chenyu Zhao , Qingbo Liu , Yingliang Zhao , Yongchang Guo , Xunchang Fei

The valorization of industrial solid wastes as sustainable alternatives to Portland cement has attracted increasing attention due to their potential for reducing CO₂ emissions and mitigating environmental pollution. In this study, a novel bio-carbonation process utilizing carbonic anhydrase-producing bacteria was introduced to enhance the mineral carbonation of coal gasification slag (CGS) and promoted the immobilization of hazardous elements. The CGS was used as a precursor for clinker-free binders, in combination with calcium carbide residue and phosphogypsum as activators. The CGS-based materials and carbonated products were systematically analyzed by a series of characterization and leaching tests. Results showed that bio-carbonation not only enhanced CO₂ sequestration, with carbon uptake increasing up to 8.66 % at 28 days, but also effectively reduced heavy metal leaching. The formation of carbonate and sulfate-bearing hydration phases such as calcite, ettringite, and C−S−H gel contributed to the improved microstructure and stability of the binders. The incorporation of phosphogypsum promoted the development of additional ettringite and facilitated heavy metal immobilization. This study demonstrated a feasible pathway for producing sustainable clinker-free cementitious materials through the bio-carbonation of CGS, achieving both CO₂ reduction and environmental risk mitigation.

工业固体废物的增值作为波特兰水泥的可持续替代品，由于其减少二氧化碳排放和减轻环境污染的潜力，引起了越来越多的关注。本文介绍了一种利用产碳酸酐酶菌进行生物碳化的新工艺，以促进煤气化渣的矿物碳化，促进有害元素的固定化。以CGS为前驱体，以电石渣和磷石膏为活化剂，制备无熟料粘结剂。通过一系列表征和浸出试验，对cgs基材料和碳酸化产物进行了系统分析。结果表明，生物碳化不仅增强了CO2固存，28 d时碳吸收量提高了8.66 %，而且有效地减少了重金属的浸出。方解石、钙矾石和C - S - H凝胶等含碳酸盐和硫酸盐水化相的形成有助于改善粘合剂的微观结构和稳定性。磷石膏的掺入促进了附加钙矾石的形成，有利于重金属的固定。本研究展示了通过CGS生物碳化生产可持续无熟料胶凝材料的可行途径，实现了二氧化碳减排和环境风险缓解。

{"title":"Mechanism of bio-carbonation on leaching behavior: a case study of coal gasification slag-based binder","authors":"Junchen Xiang , Chenyu Zhao , Qingbo Liu , Yingliang Zhao , Yongchang Guo , Xunchang Fei","doi":"10.1016/j.conbuildmat.2026.145441","DOIUrl":"10.1016/j.conbuildmat.2026.145441","url":null,"abstract":"<div><div>The valorization of industrial solid wastes as sustainable alternatives to Portland cement has attracted increasing attention due to their potential for reducing CO<sub>2</sub> emissions and mitigating environmental pollution. In this study, a novel bio-carbonation process utilizing carbonic anhydrase-producing bacteria was introduced to enhance the mineral carbonation of coal gasification slag (CGS) and promoted the immobilization of hazardous elements. The CGS was used as a precursor for clinker-free binders, in combination with calcium carbide residue and phosphogypsum as activators. The CGS-based materials and carbonated products were systematically analyzed by a series of characterization and leaching tests. Results showed that bio-carbonation not only enhanced CO<sub>2</sub> sequestration, with carbon uptake increasing up to 8.66 % at 28 days, but also effectively reduced heavy metal leaching. The formation of carbonate and sulfate-bearing hydration phases such as calcite, ettringite, and C−S−H gel contributed to the improved microstructure and stability of the binders. The incorporation of phosphogypsum promoted the development of additional ettringite and facilitated heavy metal immobilization. This study demonstrated a feasible pathway for producing sustainable clinker-free cementitious materials through the bio-carbonation of CGS, achieving both CO<sub>2</sub> reduction and environmental risk mitigation.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"513 ","pages":"Article 145441"},"PeriodicalIF":8.0,"publicationDate":"2026-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146070958","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Research on the deterioration characteristics and service life prediction of magnesium oxychloride cement concrete under different salt-freeze environments 不同盐冻环境下氯氧镁水泥混凝土劣化特性及寿命预测研究

IF 8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials

Pub Date : 2026-01-29 DOI: 10.1016/j.conbuildmat.2026.145432

An Yang , Yuan Qin , Yuanke Li

This study investigates the damage characteristics and durability of magnesium oxychloride cement concrete (MOCC) under different salt-frost conditions by simulating the saline soil environment of Golmud. Freeze-thaw tests were designed with varying salt types (chloride, sulfate, and mixed salts) and salt concentrations. The deterioration behavior was analyzed through macroscopic performance tests (mass, relative dynamic elastic modulus, and compressive strength) and microscopic characterization (SEM, XRD, and X-CT). A GM (1,1)-Markov model was established to predict the freeze-thaw life of the concrete. The results show that MOCC experiences the most significant deterioration in a clear water environment, with a 35.78 % decrease in compressive strength after 180 freeze-thaw cycles. In contrast, high chloride salt concentrations can inhibit the hydrolysis of main hydration products, resulting in the slowest deterioration, with only a 19.28 % decrease in compressive strength. Sulfate salts accelerate damage by disrupting the crystal structure of strength phases and causing salt crystallization expansion. X-CT scanning revealed that the total number of pores in MOCC increased by 78.7 % after freeze-thaw cycles in a clear water environment, with most pores concentrated in the 0–1 mm range, and the most severe damage occurring in the 0–50 mm layer. Finally, the GM (1,1)-Markov model predicted that the freeze-thaw life of C2 specimens in a high chloride salt environment could reach 196 cycles. These findings provide valuable insights for the engineering application of MOCC in salt-frost regions.

通过模拟格尔木盐渍土环境，研究了不同盐霜条件下氯氧镁水泥混凝土（MOCC）的损伤特性和耐久性。冻融试验采用不同的盐类型（氯化物、硫酸盐和混合盐）和盐浓度设计。通过宏观性能测试（质量、相对动弹性模量和抗压强度）和微观表征（SEM、XRD和X-CT）分析其劣化行为。建立了GM (1,1)-Markov模型来预测混凝土的冻融寿命。结果表明：清水环境下MOCC的抗压强度下降最为明显，经过180次冻融循环后，MOCC的抗压强度下降35.78 %；而高氯盐浓度对主要水化产物的水解有抑制作用，其降解速度最慢，抗压强度仅下降19.28 %。硫酸盐通过破坏强度相的晶体结构和引起盐的结晶膨胀来加速破坏。X-CT扫描结果显示，在清水环境下，冻融循环后MOCC孔隙总数增加78.7% %，孔隙主要集中在0-1 mm层，0-50 mm层损伤最严重。最后，GM (1,1)-Markov模型预测C2试件在高氯盐环境下的冻融寿命可达196次。这些发现为MOCC在盐霜地区的工程应用提供了有价值的见解。

{"title":"Research on the deterioration characteristics and service life prediction of magnesium oxychloride cement concrete under different salt-freeze environments","authors":"An Yang , Yuan Qin , Yuanke Li","doi":"10.1016/j.conbuildmat.2026.145432","DOIUrl":"10.1016/j.conbuildmat.2026.145432","url":null,"abstract":"<div><div>This study investigates the damage characteristics and durability of magnesium oxychloride cement concrete (MOCC) under different salt-frost conditions by simulating the saline soil environment of Golmud. Freeze-thaw tests were designed with varying salt types (chloride, sulfate, and mixed salts) and salt concentrations. The deterioration behavior was analyzed through macroscopic performance tests (mass, relative dynamic elastic modulus, and compressive strength) and microscopic characterization (SEM, XRD, and X-CT). A GM (1,1)-Markov model was established to predict the freeze-thaw life of the concrete. The results show that MOCC experiences the most significant deterioration in a clear water environment, with a 35.78 % decrease in compressive strength after 180 freeze-thaw cycles. In contrast, high chloride salt concentrations can inhibit the hydrolysis of main hydration products, resulting in the slowest deterioration, with only a 19.28 % decrease in compressive strength. Sulfate salts accelerate damage by disrupting the crystal structure of strength phases and causing salt crystallization expansion. X-CT scanning revealed that the total number of pores in MOCC increased by 78.7 % after freeze-thaw cycles in a clear water environment, with most pores concentrated in the 0–1 mm range, and the most severe damage occurring in the 0–50 mm layer. Finally, the GM (1,1)-Markov model predicted that the freeze-thaw life of C2 specimens in a high chloride salt environment could reach 196 cycles. These findings provide valuable insights for the engineering application of MOCC in salt-frost regions.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"513 ","pages":"Article 145432"},"PeriodicalIF":8.0,"publicationDate":"2026-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146070957","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Evolution mechanism of the structure and performance of lightweight ultra-high performance concrete materials under traffic vibration 交通振动作用下轻质超高性能混凝土材料结构与性能演化机理

IF 8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials

Pub Date : 2026-01-29 DOI: 10.1016/j.conbuildmat.2026.145345

Li Liu , Jun Yang , Gaozhan Zhang , Qingjun Ding , Aiguo Wang , Dongdong Chen , Jufang Cao , Daosheng Sun

Bridge repair or widening projects typically adopt half-width construction and traffic flow strategies. As a result, fresh concrete is unavoidably exposed to traffic vibrations while it hardens. This research examined how traffic-induced vibrations impact the mechanical properties, mesostructure, and microstructure of lightweight ultra-high performance concrete (LUHPC) during various stages of hardening. Mercury intrusion porosimetry (MIP), X-ray diffraction (XRD), back-scattered electron image analysis (BSE-IA), and X-ray computed tomography (X-CT) were employed to systematically analyze the performance of LUHPC and its multiscale structural characteristics under traffic vibration. The results show that during the PI and PF stages, vibration enhances axial compressive strength and elastic modulus, while the opposite effects were observed during the IF stage. The ultrasonic pulse velocity of LUHPC is highly consistent with its compressive strength, with R² values up to 0.95, providing a reliable basis for nondestructive evaluation under traffic vibration. Vibration causes changes in fiber orientation from horizontal to vertical and this change is mainly originated from the rotation of top layer steel fibers. Vibration during the IF stage (four hours) shows the highest efficient in accelerating hydration, increasing hydration degree by 9.08 % within four hours. The increasing number of gel pores in LUHPC could be related to the hydration accelerating effect of traffic vibration. Traffic vibration alters the ITZ structure around LWA, especially during the IF stage. During the IF stage, ITZ porosity in the 0–5 μm range rises by 34.87 % relative to the SC sample. Correlation analysis revealed that the contribution of fiber orientation to compressive/flexural strengths is minor under vibration, ITZ width correlates most strongly with compressive strength (R² = 0.94), and ITZ porosity with flexural strength (R² = 0.90). Traffic vibration accelerates cement hydration during various hardening stages.

桥梁维修或拓宽工程通常采用半宽施工和交通流量策略。因此，新混凝土在变硬时不可避免地暴露在交通振动中。本研究考察了交通振动对轻质超高性能混凝土（LUHPC）在不同硬化阶段的力学性能、细观结构和微观结构的影响。采用汞侵入孔隙度法（MIP）、x射线衍射（XRD）、背散射电子图像分析（BSE-IA）和x射线计算机断层扫描（X-CT）等方法，系统分析了交通振动作用下LUHPC的性能及其多尺度结构特征。结果表明：振动对轴向抗压强度和弹性模量有显著的促进作用，而中频阶段则相反；超声脉冲速度与其抗压强度高度一致，R2值高达0.95，为交通振动下的无损评价提供了可靠依据。振动引起纤维取向由水平向垂直的变化，这种变化主要源于顶层钢纤维的旋转。中频阶段（4小时）的振动对水化的促进效果最好，在4小时内水化程度提高了9.08 %。LUHPC中凝胶孔数量的增加可能与交通振动的水化加速作用有关。交通振动改变了LWA附近的ITZ结构，尤其是中频阶段。在中频阶段，相对于SC试样，0 ~ 5 μm范围内的ITZ孔隙率提高了34.87 %。相关分析结果表明，振动作用下纤维取向对抗压/抗弯强度的影响较小，纤层宽度与抗压强度的相关性最强（R2 = 0.94），纤层孔隙率与抗弯强度的相关性最强（R2 = 0.90）。交通振动加速了水泥各硬化阶段的水化。

{"title":"Evolution mechanism of the structure and performance of lightweight ultra-high performance concrete materials under traffic vibration","authors":"Li Liu , Jun Yang , Gaozhan Zhang , Qingjun Ding , Aiguo Wang , Dongdong Chen , Jufang Cao , Daosheng Sun","doi":"10.1016/j.conbuildmat.2026.145345","DOIUrl":"10.1016/j.conbuildmat.2026.145345","url":null,"abstract":"<div><div>Bridge repair or widening projects typically adopt half-width construction and traffic flow strategies. As a result, fresh concrete is unavoidably exposed to traffic vibrations while it hardens. This research examined how traffic-induced vibrations impact the mechanical properties, mesostructure, and microstructure of lightweight ultra-high performance concrete (LUHPC) during various stages of hardening. Mercury intrusion porosimetry (MIP), X-ray diffraction (XRD), back-scattered electron image analysis (BSE-IA), and X-ray computed tomography (X-CT) were employed to systematically analyze the performance of LUHPC and its multiscale structural characteristics under traffic vibration. The results show that during the PI and PF stages, vibration enhances axial compressive strength and elastic modulus, while the opposite effects were observed during the IF stage. The ultrasonic pulse velocity of LUHPC is highly consistent with its compressive strength, with R<sup>2</sup> values up to 0.95, providing a reliable basis for nondestructive evaluation under traffic vibration. Vibration causes changes in fiber orientation from horizontal to vertical and this change is mainly originated from the rotation of top layer steel fibers. Vibration during the IF stage (four hours) shows the highest efficient in accelerating hydration, increasing hydration degree by 9.08 % within four hours. The increasing number of gel pores in LUHPC could be related to the hydration accelerating effect of traffic vibration. Traffic vibration alters the ITZ structure around LWA, especially during the IF stage. During the IF stage, ITZ porosity in the 0–5 μm range rises by 34.87 % relative to the SC sample. Correlation analysis revealed that the contribution of fiber orientation to compressive/flexural strengths is minor under vibration, ITZ width correlates most strongly with compressive strength (R<sup>2</sup> = 0.94), and ITZ porosity with flexural strength (R<sup>2</sup> = 0.90). Traffic vibration accelerates cement hydration during various hardening stages.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"513 ","pages":"Article 145345"},"PeriodicalIF":8.0,"publicationDate":"2026-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146070965","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Performance of surface-grafted nano-SiO2 -modified bamboo bark fiber asphalt mixtures under low-temperature and water-salt damage conditions 表面接枝纳米sio2改性竹皮纤维沥青混合料在低温和水盐损伤条件下的性能

IF 8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials

Pub Date : 2026-01-29 DOI: 10.1016/j.conbuildmat.2026.145133

Nan Zhang , Xichen Wang , Nanxiang Zheng , Jingting Huang

An investigation was conducted into the application of modified bamboo bark fibers derived from bamboo plywood processing waste in asphalt mixtures. To improve the adsorption capacity of bamboo bark fibers for asphalt, the bamboo fiber was modified by grafting nano-SiO₂ The microstructure, chemical composition and modification mechanisms of the fibers were analyzed by SEM, TG, contact angle and adhesive work. Comparative evaluations with traditional lignin fiber-based mixtures focused on water resistance, low-temperature crack resistance and fatigue performance. The results demonstrated that the modification significantly improved the surface roughness, hydrophobicity, and thermal stability of the bamboo bark fibers, while enhancing their adhesion to asphalt. Among the modified fibers, NaOH-KH570-nano-SiO₂ modified bamboo bark fibers (NKSBF) exhibited the most remarkable performance improvements. Compared to lignin fibers, NKSBF increased the high-temperature stability of the asphalt mixture by 24.2 %, maximized the low-temperature bending strain by 57.8 %, and effectively delayed crack propagation under low-temperature stress, indicating substantial enhancement in low-temperature crack resistance. In saline environments, the tensile strength under splitting resistance of NKSBF-modified asphalt increased by 10.3 %, while its fatigue performance improved by 59.3 %. These findings confirm the promising application potential of SiO₂-grafted bamboo bark fibers in asphalt mixtures.

以竹胶合板加工废料为原料，研究了改性竹皮纤维在沥青混合料中的应用。为提高竹皮纤维对沥青的吸附能力，通过接枝纳米sio2对竹皮纤维进行改性，通过SEM、TG、接触角和粘接功分析了竹皮纤维的微观结构、化学成分和改性机理。与传统木质素纤维基混合物的耐水性、低温抗裂性和疲劳性能进行了对比评价。结果表明，改性后的竹皮纤维表面粗糙度、疏水性和热稳定性显著提高，与沥青的附着力增强。在改性纤维中，NaOH-KH570-nano-SiO₂改性竹皮纤维（NKSBF）的性能改善最为显著。与木素纤维相比，NKSBF可使沥青混合料的高温稳定性提高24.2% %，使低温弯曲应变最大化57.8% %，并可有效延缓低温应力下的裂纹扩展，低温抗裂性显著增强。在盐渍环境下，nksbf改性沥青抗劈裂强度提高10.3 %，疲劳性能提高59.3 %。这些研究结果证实了二氧化硅接枝竹皮纤维在沥青混合料中的应用前景。

{"title":"Performance of surface-grafted nano-SiO2 -modified bamboo bark fiber asphalt mixtures under low-temperature and water-salt damage conditions","authors":"Nan Zhang , Xichen Wang , Nanxiang Zheng , Jingting Huang","doi":"10.1016/j.conbuildmat.2026.145133","DOIUrl":"10.1016/j.conbuildmat.2026.145133","url":null,"abstract":"<div><div>An investigation was conducted into the application of modified bamboo bark fibers derived from bamboo plywood processing waste in asphalt mixtures. To improve the adsorption capacity of bamboo bark fibers for asphalt, the bamboo fiber was modified by grafting nano-SiO<sub>2</sub> The microstructure, chemical composition and modification mechanisms of the fibers were analyzed by SEM, TG, contact angle and adhesive work. Comparative evaluations with traditional lignin fiber-based mixtures focused on water resistance, low-temperature crack resistance and fatigue performance. The results demonstrated that the modification significantly improved the surface roughness, hydrophobicity, and thermal stability of the bamboo bark fibers, while enhancing their adhesion to asphalt. Among the modified fibers, NaOH-KH570-nano-SiO₂ modified bamboo bark fibers (NKSBF) exhibited the most remarkable performance improvements. Compared to lignin fibers, NKSBF increased the high-temperature stability of the asphalt mixture by 24.2 %, maximized the low-temperature bending strain by 57.8 %, and effectively delayed crack propagation under low-temperature stress, indicating substantial enhancement in low-temperature crack resistance. In saline environments, the tensile strength under splitting resistance of NKSBF-modified asphalt increased by 10.3 %, while its fatigue performance improved by 59.3 %. These findings confirm the promising application potential of SiO<sub>2</sub>-grafted bamboo bark fibers in asphalt mixtures.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"513 ","pages":"Article 145133"},"PeriodicalIF":8.0,"publicationDate":"2026-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146070907","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

From hazardous waste to sustainable filler: Synergistic use of treated spent cathode carbon and basalt fiber in asphalt mixtures 从危险废物到可持续填料：在沥青混合物中协同使用处理过的废阴极碳和玄武岩纤维

IF 8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials

Pub Date : 2026-01-27 DOI: 10.1016/j.conbuildmat.2026.145412

Yongjun Meng , Qiyao Wang , Yingwei Li , Beite Li , Tianyi Yan , Guodong Li

Spent cathode carbon blocks (SCCB), a by-product of aluminum electrolysis, are considered hazardous waste because they contain toxic substances like fluoride and cyanide. Traditional treatment methods pose a risk of environmental pollution. To achieve reliable and large-scale recycling and utilization of SCCB, this paper utilizes physicochemical synergistic harmless treatment of spent cathode carbon powder (SCCP) to prepare gel-encapsulated spent cathode carbon (PSC), PSC is used as a filler to replace part of limestone powder (LP), and basalt fiber is introduced as a modifier. Microscopic analysis, pavement performance, and environmental tests were conducted to evaluate its feasibility in road engineering, and analysis of variance (ANOVA) was employed to statistically analyze the performance differences among different treatments. The results show that PSC surfaces contain numerous grooves and pores, which bond well with asphalt. When the PSC replacement ratio is 50 %, the overall pavement performance of the asphalt mixture reaches the optimal level. However, all PSC replacement ratios exert a negative impact on the low-temperature cracking resistance of the asphalt mixture, and this adverse effect can be effectively mitigated by the incorporation of basalt fiber. After synergistic treatment, the fluoride ion leaching concentration of PSC is significantly reduced to 8.207 mg·L⁻¹ , and the fluoride ion leaching concentration of the corresponding asphalt mixture is less than 10 mg·L⁻¹ , both of which meet the environmental standards. This study proposes a sustainable approach to the resource recovery of SCCB, facilitating the safe recycling of hazardous materials and contributing to sustainable environmental development.

废阴极碳块（SCCB）是铝电解的副产品，因为含有氟化物和氰化物等有毒物质而被认为是危险废物。传统的处理方法存在污染环境的风险。为实现废阴极炭的可靠大规模回收利用，采用物化增效无害化处理方法对废阴极炭粉（SCCP）进行了制备凝胶包埋的废阴极炭（PSC），以PSC作为填料替代部分石灰石粉（LP），并引入玄武岩纤维作为改性剂。通过微观分析、路面性能和环境试验来评估其在道路工程中的可行性，并采用方差分析（ANOVA）来统计分析不同处理之间的性能差异。结果表明，PSC表面含有大量沟槽和孔隙，与沥青结合良好。当PSC替换率为50 %时，沥青混合料的整体路用性能达到最佳水平。然而，所有PSC替换率对沥青混合料的低温抗裂性能都有负面影响，而玄武岩纤维的掺入可以有效地缓解这一不利影响。经协同处理后，PSC的氟离子浸出浓度显著降低至8.207 mg·L⁻¹ ，相应的沥青混合料的氟离子浸出浓度小于10 mg·L⁻¹ ，均符合环保标准。本研究提出了一种可持续的SCCB资源回收方法，促进有害物质的安全回收，促进环境的可持续发展。

{"title":"From hazardous waste to sustainable filler: Synergistic use of treated spent cathode carbon and basalt fiber in asphalt mixtures","authors":"Yongjun Meng , Qiyao Wang , Yingwei Li , Beite Li , Tianyi Yan , Guodong Li","doi":"10.1016/j.conbuildmat.2026.145412","DOIUrl":"10.1016/j.conbuildmat.2026.145412","url":null,"abstract":"<div><div>Spent cathode carbon blocks (SCCB), a by-product of aluminum electrolysis, are considered hazardous waste because they contain toxic substances like fluoride and cyanide. Traditional treatment methods pose a risk of environmental pollution. To achieve reliable and large-scale recycling and utilization of SCCB, this paper utilizes physicochemical synergistic harmless treatment of spent cathode carbon powder (SCCP) to prepare gel-encapsulated spent cathode carbon (PSC), PSC is used as a filler to replace part of limestone powder (LP), and basalt fiber is introduced as a modifier. Microscopic analysis, pavement performance, and environmental tests were conducted to evaluate its feasibility in road engineering, and analysis of variance (ANOVA) was employed to statistically analyze the performance differences among different treatments. The results show that PSC surfaces contain numerous grooves and pores, which bond well with asphalt. When the PSC replacement ratio is 50 %, the overall pavement performance of the asphalt mixture reaches the optimal level. However, all PSC replacement ratios exert a negative impact on the low-temperature cracking resistance of the asphalt mixture, and this adverse effect can be effectively mitigated by the incorporation of basalt fiber. After synergistic treatment, the fluoride ion leaching concentration of PSC is significantly reduced to 8.207 mg·L⁻¹ , and the fluoride ion leaching concentration of the corresponding asphalt mixture is less than 10 mg·L⁻¹ , both of which meet the environmental standards. This study proposes a sustainable approach to the resource recovery of SCCB, facilitating the safe recycling of hazardous materials and contributing to sustainable environmental development.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"512 ","pages":"Article 145412"},"PeriodicalIF":8.0,"publicationDate":"2026-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146090281","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0