Construction and Building Materials最新文献_第10页

Dynamic compressive behavior of ECC with PET fine aggregate: Experimental investigation and constitutive modeling PET细骨料ECC的动态压缩性能：实验研究与本构模型

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

Construction and Building Materials

Pub Date : 2026-01-12 DOI: 10.1016/j.conbuildmat.2026.145202

Bei-Xin Xie , Zheng Guo , Xue-Er Zhang , Shuo Wang , Huang-Yan Xu , Gai Chen , Zhi-Hong Xie , Jia-Xiang Lin , Yong-Chang Guo

Engineered cementitious composites using polyethylene terephthalate as fine aggregate (PET-ECC) combine the advantages of waste plastic utilization and high ductility. The distinct material and interfacial properties of PET compared with mineral aggregates may alter the dynamic behavior of ECC, motivating the present investigation. In this study, impact compression tests of PET-ECC were conducted using a split Hopkinson pressure bar (SHPB) over a strain rate range of 50–150/s. Three water-to-binder ratios (0.21, 0.30, and 0.39) and four PET particle sizes (median size: 72.6–267.5 μm) were considered. The results show that PET-ECC exhibits pronounced strain-rate sensitivity, with dynamic compressive strength, peak strain, energy absorption, and fragmentation degree all increasing with strain rate. Reducing PET particle size improves pore structure and decreases flaw size, resulting in an enhancement of approximately 11–13 % in compressive strength. The dynamic increase factor (DIF) increases with water-to-binder ratios, and specimens with either large or ultrafine PET particles exhibit higher values. A damage-based dynamic constitutive model based on the ZWT viscoelastic theory was developed, which accurately captures the dynamic stress-strain responses with an average R² of 97 %. Sustainability analysis reveals up to a 47 % improvement in dynamic mechanical performance per unit environmental cost, highlighting PET-ECC’s potential for green construction. These findings provide valuable insights into the engineering design and application of PET-ECC under extreme loads, such as impact and seismic events.

以聚对苯二甲酸乙二醇酯为细骨料的工程胶凝复合材料（PET-ECC）结合了废塑料利用和高延展性的优点。与矿物聚集体相比，PET的独特材料和界面特性可能会改变ECC的动态行为，从而推动本研究的开展。本研究采用分离式霍普金森压杆（SHPB）在50-150 /s应变速率范围内对PET-ECC进行冲击压缩试验。考虑了三种水胶比（0.21,0.30和0.39）和四种PET粒径（中位数尺寸：72.6-267.5 μm）。结果表明：PET-ECC具有明显的应变速率敏感性，动态抗压强度、峰值应变、能量吸收和破碎程度均随应变速率的增加而增加；减小PET粒径可改善孔隙结构，减小缺陷尺寸，抗压强度提高约11 - 13% %。动态增加因子（DIF）随水胶比的增加而增加，PET颗粒大或超细的样品都表现出更高的数值。建立了基于ZWT粘弹性理论的基于损伤的动态本构模型，该模型能准确地捕捉到动态应力应变响应，平均R2为97 %。可持续性分析显示，每单位环境成本的动态机械性能提高了47% %，突出了PET-ECC在绿色建筑方面的潜力。这些发现为PET-ECC在极端载荷（如冲击和地震事件）下的工程设计和应用提供了有价值的见解。

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引用次数: 0

Investigating the microstructure of mortar systems reinforced with wind turbine blade waste using X-ray computed tomography 利用x射线计算机断层扫描研究风力涡轮机叶片废料加固砂浆系统的微观结构

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

Construction and Building Materials

Pub Date : 2026-01-12 DOI: 10.1016/j.conbuildmat.2026.145187

Charilaos Paraskevoulakos, Tao Liu, Ana Teresa Lima

The potential of valorising shredded end of life wind turbine blades (EoL-WTB) as reinforcement for mortar applications has been only scarcely explored. The relevant studies prove that incorporating WTBW within the mortar matrix can improve the composite strength. However, this reinforcing amplitude varies significantly. Unravelling the corresponding microstructure, which is known to play a pivotal role on the behaviour of fibre-reinforced cement-based composites, remains a knowledge gap until today. This paper attempts to fill this gap via utilising X-ray computed tomography (XCT) to investigate the microstructure of this novel composite. In line with the state-of the-art industry-trail practices, various sizes of the embedded WTBW have been incorporated into the relevant cement matrices. The effect of the waste size on the composite microstructure is determined via probing differences in the porosity behaviour (pore size and spatial distribution and shape factor) and the cement hydration. The spatial distribution and orientation of the WTBW, dispersed within the composite volume, is also investigated. Microstructural observations are linked with the corresponding sample strength. The results reveal the crucial effect of the embedded waste’ size on both cement hydration and generated porosity.

将报废风力涡轮机叶片（EoL-WTB）作为砂浆加固材料的潜力几乎没有得到探索。相关研究证明，在砂浆基体中掺入WTBW可提高复合材料强度。然而，这种强化幅度变化很大。揭示相应的微观结构，这在纤维增强水泥基复合材料的行为中起着关键作用，直到今天仍然是一个知识缺口。本文试图通过利用x射线计算机断层扫描（XCT）来研究这种新型复合材料的微观结构来填补这一空白。根据最先进的行业实践，各种尺寸的嵌入式WTBW已被纳入相关的水泥基质中。垃圾粒径对复合材料微观结构的影响是通过探测孔隙行为（孔隙大小、空间分布和形状因子）和水泥水化的差异来确定的。此外，还研究了分散在复合体内的WTBW的空间分布和取向。显微结构观察与相应的样品强度相关联。结果表明，埋置废弃物粒径对水泥水化和孔隙度的影响至关重要。

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引用次数: 0

Development and evaluation of epoxy resin/activated rubber powder modified asphalt: Optimization, performance, reaction mechanism, and cost-effectiveness 环氧树脂/活性胶粉改性沥青的开发与评价：优化、性能、反应机理和成本效益

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

Construction and Building Materials

Pub Date : 2026-01-12 DOI: 10.1016/j.conbuildmat.2026.145183

Peipei Kong , Xianhua Chen , Guocui Teng , Jianping Han , Tengfei Nian , Shiqi Wang , Gang Xu

The severe climatic conditions and intense economic activities in the Hexi region of China pose significant challenges to the durability of asphalt pavements. To address this issue, the study developed an epoxy resin/activated rubber powder modified asphalt (EARMA) binder. To accelerate the application of this material in the Hexi region of China, a thorough evaluation was conducted encompassing the optimization of the preparation process, high-, low-, and intermediate-temperature performance, aging resistance, the reaction mechanism, and cost-effectiveness of EARMA. The results indicate that the optimal formulation of EARMA for the Hexi region of China comprises an activated rubber powder dosage of 21.30 % (by weight of asphalt), epoxy resin dosage of 4.25 % (by weight of asphalt), the ratio of epoxy resin to curing agent of 1.27, curing at 170 °C for 3 h, followed by 2 days at 60 °C. The results of assessments on high-, low-, and intermediate-temperature performance, as well as aging resistance suggest that EARMA not only shows exceptional resistance to rutting but also exhibits favorable low-temperature performance, fatigue resistance, and aging resistance. Reaction mechanism studies demonstrate that epoxy groups within epoxy resins undergo ring-opening reactions to crosslink with polar functional groups (such as secondary amines, tertiary amines, hydroxyl groups, and carboxyl groups) present in curing agent, activated rubber powder, and base asphalt, forming ether compounds. Raw material economic evaluations reveal that the raw material cost of EARMA is reduced by 21.4–84.1 CNY/ton in comparison to styrene-butadiene-styrene modified asphalt and styrene-butadiene rubber modified asphalt.

中国河西地区恶劣的气候条件和密集的经济活动对沥青路面的耐久性提出了重大挑战。针对这一问题，研究开发了一种环氧树脂/活性胶粉改性沥青（EARMA）粘结剂。为加快该材料在河西地区的应用，从制备工艺优化、高、低温、中温性能、耐老化性能、反应机理、成本效益等方面进行了全面评价。结果表明，中国河西地区EARMA的最佳配方为活性胶粉用量为21.30 %（沥青重量），环氧树脂用量为4.25 %（沥青重量），环氧树脂与固化剂的比例为1.27，在170℃下固化3 h，在60℃下固化2 d。高、低温、中温性能和耐老化性能评价结果表明，EARMA不仅具有优异的抗车辙性能，而且具有良好的低温性能、耐疲劳性能和耐老化性能。反应机理研究表明，环氧树脂中的环氧基与固化剂、活性橡胶粉和基础沥青中的极性官能团（如仲胺、叔胺、羟基和羧基）发生开环反应，形成醚类化合物。原料经济评价表明，与丁苯改性沥青和丁苯橡胶改性沥青相比，EARMA的原料成本降低21.4 ~ 84.1元/吨。

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引用次数: 0

Mechanistic and spatiotemporal evolution of alkali-pumping in newly constructed bridge pavements in subtropical environments 亚热带环境下新建桥面抽碱机理及时空演化

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

Construction and Building Materials

Pub Date : 2026-01-12 DOI: 10.1016/j.conbuildmat.2026.145163

Yadong Xie , Xu Yue , Junfei Zheng , Guangwei Chen , Lin Kong , Dongya Ren

In hot and humid regions, early alkali-pumping frequently occurs in newly constructed asphalt pavement layer on cement concrete bridge deck, with surface whitening often observed even before the bridge is opened to traffic. This phenomenon severely compromises the durability and service performance of the bridge deck system. To elucidate its formation mechanism and dominant influencing factors, this study investigates a newly built cement concrete bridge deck located in a typical subtropical climate zone, where extensive surface whitening occurred even before the bridge was opened to traffic. A combination of field investigation, permeability testing, ground penetrating radar (GPR), computed tomography (CT) scanning, and X-ray analyses (XRD/XRF) was employed to systematically explore the water migration pathways and the spatiotemporal characteristics of alkali-pumping evolution. The results indicate that the early occurrence of alkali-pumping is closely related to insufficient interlayer compaction, moisture accumulation in structural depressions, and preferential infiltration through poorly drained zones such as shoulders and joints. CT analysis demonstrated the presence of interconnected pores within the asphalt layer, which serve as channels for upward moisture migration and calcium ion transport. XRD and XRF tests confirmed that the alkali-pumping products are primarily composed of calcium carbonate, originating from the free calcium components in the cement concrete decks. This study advances the theoretical understanding of alkali-pumping in cement concrete bridge decks under hot and humid environments and provides a scientific basis and technical reference for improving structural design and early-stage damage prevention.

在湿热地区，水泥混凝土桥面新建沥青路面层经常出现早期抽碱现象，甚至在桥梁通车前就出现了表面白化现象。这种现象严重影响了桥面体系的耐久性和使用性能。为了阐明其形成机制和主要影响因素，本研究以位于典型亚热带气候区的新建水泥混凝土桥面为研究对象，该桥面在通车前就出现了大面积的白化现象。采用现场调查、渗透率测试、探地雷达（GPR）、CT扫描、x射线衍射（XRD/XRF）等方法，系统探讨了水运移路径及抽碱演化的时空特征。结果表明，抽碱的早期发生与层间压实不足、构造洼地水分积聚、肩、节理等排水性差带优先入渗密切相关。CT分析表明，沥青层内存在相互连接的孔隙，这些孔隙是向上迁移水分和钙离子的通道。XRD和XRF测试证实，抽碱产物主要由碳酸钙组成，来源于水泥混凝土甲板中的游离钙成分。本研究提高了湿热环境下水泥混凝土桥面抽碱的理论认识，为改进结构设计和早期损伤预防提供了科学依据和技术参考。

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引用次数: 0

The potential of SiO2 obtained from pyrite slag: Used in the fabrication of SiO2/graphite glass ceramic with pronounced capacity for electromagnetic wave absorption 从黄铁矿渣中提取SiO2的电位：用于制备具有明显电磁波吸收能力的SiO2/石墨玻璃陶瓷

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

Construction and Building Materials

Pub Date : 2026-01-12 DOI: 10.1016/j.conbuildmat.2026.145157

Yuzhao Ma , Muqing Li , Aifang Pan , Xiaofeng Yang , Hudie Yuan , Dahong Chen

The rapid development of electronic devices is increasing electromagnetic pollution, raising demand for efficient electromagnetic wave absorption materials in commercial applications. Low-cost SiO₂/graphite glass ceramics with excellent EMW absorption and load-bearing capacity were fabricated using amorphous SiO₂, recycled from Baihe pyrite slag, showing potential for use as EMW absorbing building exterior walls decoration layer material. The effects of sintering temperature, graphite content, and fluxing agent addition on ceramic preparation were investigated. XRD, SEM, and EDS analyses confirmed phase composition and microstructural evolution during fabrication. Mechanical property of samples showed that adding a small amount of graphite improves crack propagation resistance and enhances mechanical properties, with bending strength of glass ceramics with 10 % graphite adding reached 18.3 MPa. However, further increasing graphite content reduces the material's mechanical properties. The EMW absorption of SiO₂/graphite glass ceramics with varying graphite contents was studied over 2–18 GHz. Optimal performance occurs at 20 % graphite content, achieving a minimum reflection loss (RL_min) of –28.4 dB and an effective absorption bandwidth of 3.4 GHz, due to impedance matching ability. Overall, the 20 % graphite composition offers excellent EMW absorption (RL_min=–28.4 dB) and good mechanical strength. The use of SiO₂ derived from Baihe pyrite slag to fabricate EMW absorbable glass ceramics enables tailings recycling, reduces environmental pollution, and lowers production costs for load-bearing EMW absorbing materials, supporting economic circularity.

电子器件的快速发展使电磁污染日益严重，在商业应用中对高效电磁波吸收材料提出了更高的需求。利用从白河黄铁矿渣中回收的无定形sio2制备了具有良好EMW吸收和承载能力的低成本sio2 /石墨玻璃陶瓷，具有作为建筑外墙装饰层材料吸收EMW的潜力。研究了烧结温度、石墨含量、助熔剂用量对陶瓷制备的影响。XRD， SEM和EDS分析证实了在制造过程中相组成和微观结构的演变。试样的力学性能表明，少量石墨的加入改善了试样的抗裂纹扩展性能，提高了试样的力学性能，石墨添加量为10 %时，玻璃陶瓷的抗弯强度达到18.3 MPa。然而，进一步增加石墨含量会降低材料的机械性能。研究了不同石墨含量SiO2/石墨玻璃陶瓷在2-18 GHz范围内对EMW的吸收。当石墨含量为20% %时，由于阻抗匹配能力，反射损耗最小（RLmin）为-28.4 dB，有效吸收带宽为3.4 GHz。总体而言，20% %的石墨成分具有优异的EMW吸收性能（RLmin= -28.4 dB）和良好的机械强度。利用从白河黄铁矿渣中提取的SiO2制备EMW可吸收玻璃陶瓷，实现了尾矿的回收利用，减少了环境污染，降低了承载EMW吸收材料的生产成本，支持经济循环。

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引用次数: 0

A facile coprecipitation strategy for engineering a robust Z-scheme coating with high-efficiency photoelectrochemical anticorrosion and durability 一种简单的共沉淀策略，用于设计具有高效光电化学防腐和耐用性的坚固z方案涂层

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

Construction and Building Materials

Pub Date : 2026-01-12 DOI: 10.1016/j.conbuildmat.2026.145219

Haosen Jiang , Zuquan Jin , Xiaoyuan Li , Zheng Li , Xiaoying Zhang

A Z–scheme TiO₂/CdS heterojunction composite was synthesized via a coprecipitation method and incorporated into a super–clear resin (SCR) matrix to construct a photoelectrochemical cathodic protection (PECCP) coating. The construction of the Z–scheme TiO₂/CdS heterojunction extended the optical absorption edge from 406 to 582 nm, effectively promoting the separation of photogenerated electron–hole pairs and enhancing the electrochemically active surface area by approximately 44 times. The protection efficiencies of PECCP coating were 74.45 % and 98.88 % higher than those of the SCR coating under dark and illuminated conditions, respectively, after 480 h immersed in a 3.5 wt% NaCl solution. After 1200 h of accelerated ultraviolet aging, the performance of the PECCP coating remained stable. Its optical absorption edge showed fluctuations of less than 15 nm and was consistently maintained above 583 nm, while a hardness of 77 HD and a surface roughness of 63 μm were retained. In contrast, SCR coating hardness decreased to 56 HD, and its surface roughness increased sharply to 223 μm. This work provides a new strategy for designing high–performance PECCP composites and offers key material and experimental guidance for developing durable anticorrosion coatings for marine steel structures.

采用共沉淀法合成了Z-scheme TiO2/CdS异质结复合材料，并将其掺入超透明树脂（SCR）基体中，构建了光电阴极保护（PECCP）涂层。Z-scheme TiO2/CdS异质结的构建将光吸收边从406延伸到582 nm，有效地促进了光生电子-空穴对的分离，并将电化学活性表面积提高了约44倍。在3.5 wt% NaCl溶液中浸泡480 h后，PECCP涂层在黑暗和光照条件下的保护效率分别比SCR涂层高74.45 %和98.88 %。经1200 h加速紫外老化后，PECCP涂层性能保持稳定。其光吸收边缘波动小于15 nm，稳定保持在583 nm以上，硬度为77 HD，表面粗糙度为63 μm。SCR涂层硬度下降至56 HD，表面粗糙度急剧上升至223 μm。本研究为高性能PECCP复合材料的设计提供了新思路，为开发船用钢结构耐久防腐涂料提供了关键材料和实验指导。

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引用次数: 0

Enhancing seismic resilience of precast bridge piers using novel inner column socket connection with HPC/ECC materials 新型HPC/ECC材料内柱套接提高预制桥墩抗震性能

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

Construction and Building Materials

Pub Date : 2026-01-12 DOI: 10.1016/j.conbuildmat.2026.145208

Rashad Al-Shaebi , Ning Li

This study introduces an innovative inner column socket connection (ICSC) method designed to enhance the seismic resistance of precast segmental bridge piers (PSBPs) by leveraging the advanced properties of high-performance concrete (HPC) and engineered cementitious composites (ECC). The ICSC incorporates an inner column (IC) made of HPC (IC-HPC) or ECC (IC-ECC) within the pier’s plastic hinge region, optimizing strength, ductility, self-centering, energy dissipation, and damage control. Cyclic loading tests were performed on three PSBP specimens: a baseline pier without an IC (P-NIC), one with IC-HPC (P-IC-HPC), and one with IC-ECC (P-IC-ECC). Experimental results reveal significant seismic performance improvements of PSBP with ICs (PSBP-ICs), with P-IC-HPC and P-IC-ECC achieving lateral load capacity increases of 25.2%–34%, compared to P-NIC. Residual displacements decreased by 54–72%, while energy dissipation capacity rose by 16.3–24.3% in PSBP-ICs, showcasing enhanced damage control and self-centering behavior. The integration of HPC and ECC in the ICSC system provides exceptional drift capacities and resilience, making it highly suitable for bridge construction in high-seismic regions. This research highlights the potential of composite materials in advancing structural engineering, offering a practical solution for improving the seismic design and accelerated construction of bridge piers.

本研究介绍了一种创新的内柱套接连接（ICSC）方法，旨在通过利用高性能混凝土（HPC）和工程胶凝复合材料（ECC）的先进性能，提高预制节段桥墩（psbp）的抗震性能。ICSC在桥墩塑性铰区域内加入由HPC （IC-HPC）或ECC （IC-ECC）制成的内柱（IC），优化了强度、延性、自定心、耗能和损伤控制。在三个PSBP试件上进行了循环加载试验：一个没有IC的基线墩（P-NIC），一个有IC- hpc (P-IC-HPC)，一个有IC- ecc （P-IC-ECC）。实验结果表明，与P-NIC相比，P-IC-HPC和P-IC-ECC的横向承载能力提高了25.2%-34%。psbp - ic的残余位移减少了54-72%，而能量耗散能力增加了16.3-24.3%，表现出增强的损伤控制和自定心行为。ICSC系统中HPC和ECC的集成提供了出色的漂移能力和弹性，使其非常适用于高地震地区的桥梁建设。该研究突出了复合材料在推进结构工程方面的潜力，为改进桥梁桥墩的抗震设计和加速施工提供了切实可行的解决方案。

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引用次数: 0

A synergistic strategy with phosphorus-based compound and ionic liquid VIPA for simultaneously enhanced flame retardancy, mechanical properties, and chemical resistance of epoxy resin 与磷基化合物和离子液体VIPA协同作用，同时增强环氧树脂的阻燃性、力学性能和耐化学性

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

Construction and Building Materials

Pub Date : 2026-01-12 DOI: 10.1016/j.conbuildmat.2026.145224

Guoping Zhu, Jingjing Gao, Yu Huang, Zhennan Wang, Yadong Wang, Zongmin Zhu

Epoxy resins (EP) are widely used in construction and electronic packaging， however, their flammability and the substantial smoke generation during combustion remain critical issues that need to be addressed. In this study, a novel ionic liquid, VIPA, was synthesized via a one-step method and co-introduced into the EP system along with DOPO. When 3 wt% DOPO and 1 wt% VIPA were added, the composite achieved a V-0 rating in the UL-94 test, with the LOI increasing to 32.3 %. The fire hazard of the EP-3DOPO/1VIPA composite significantly decreased, with a 36.3 % reduction in pHRR, while maintaining excellent mechanical properties: the tensile strength increased by 44.2 %, and the impact strength improved by 65.9 %. The synergistic effect of DOPO and VIPA also endowed the material with high transparency, UV resistance, acid and alkali stability, and significant fluorescence properties. The multifunctional enhancement mechanisms under the synergistic action of multiple components were revealed, providing experimental evidence for the development of multi-component thermosetting composites with both high safety and multifunctionality.

环氧树脂（EP）广泛应用于建筑和电子封装领域，但其可燃性和燃烧过程中产生的大量烟雾仍然是需要解决的关键问题。本研究通过一步法合成了一种新型离子液体VIPA，并将其与DOPO共引入EP体系。当添加3 wt% DOPO和1 wt% VIPA时，该复合材料在UL-94测试中达到V-0等级，LOI增加到32.3% %。EP-3DOPO/1VIPA复合材料的火灾危险性显著降低，pHRR降低36.3% %，同时保持了优异的力学性能：拉伸强度提高44.2% %，冲击强度提高65.9% %。DOPO和VIPA的协同作用也使材料具有高透明度、抗紫外线、酸碱稳定性和显著的荧光性能。揭示了多组分协同作用下的多功能增强机理，为研制高安全性、多功能的多组分热固性复合材料提供了实验依据。

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引用次数: 0

Unveiling the self-sensing mechanism and multifunctional performance of intelligent engineered cementitious composites 揭示了智能工程胶凝复合材料的自传感机理和多功能性能

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

Construction and Building Materials

Pub Date : 2026-01-12 DOI: 10.1016/j.conbuildmat.2026.145147

Hao Shen, Yingwu Zhou, Menghuan Guo, Zhongfeng Zhu, Biao Hu, Xiaoxu Huang

This research pioneers the development of intelligent engineered cementitious composites (ECCs) that integrate autonomous crack-width control, inherent self-sensing, and robust self-healing functionalities. The optimized composite demonstrates superior tensile ductility (nearly 7.9 % tensile strain) alongside a considerable compressive strength of ∼40 MPa, ensuring robust mechanical performance. Its intrinsic intelligence is unveiled through a distinctive, three-stage piezoresistive response under tension, providing discernible electrical signatures for elastic deformation, microcrack formation, and damage propagation—and enabling real-time structural health monitoring. Notably, we observed significant piezoresistive behavior for ECCs without carbon fibers (CF), indicating that the self-sensing mechanism arises not only from CF-formed conductive paths, but also from ion migration through pore networks and interfacial polarization. While the developed self-sensing ECCs reduce the dependency on conventional conductive fillers, the addition of CFs serves to substantially improve sensing stability. Furthermore, the intelligent ECCs exhibit pronounced self-healing, effectively autogenously sealing cracks below 200 µm via calcium carbonate precipitation during wet-dry cycles. This study establishes a foundational pathway for designing next-generation smart ECCs, which are critical for constructing sustainable, resilient, and intelligently monitored infrastructure systems that can self-diagnose damage and self-recover longevity.

这项研究开创了智能工程胶凝复合材料（ECCs）的发展，该复合材料集成了自主裂缝宽度控制、固有的自感知和强大的自修复功能。优化后的复合材料具有优异的拉伸延展性（接近7.9 %的拉伸应变）以及可观的抗压强度（约40 MPa），确保了稳健的机械性能。它的内在智能是通过在张力下独特的三阶段压阻响应来揭示的，为弹性变形、微裂纹形成和损伤传播提供了可识别的电子特征，并实现了实时结构健康监测。值得注意的是，我们观察到无碳纤维的ECCs （CF）具有显著的压阻行为，这表明自感机制不仅来自CF形成的导电路径，还来自离子通过孔隙网络和界面极化的迁移。虽然开发的自传感ECCs减少了对传统导电填料的依赖，但CFs的加入大大提高了传感稳定性。此外，智能ecc表现出明显的自修复能力，在干湿循环过程中通过碳酸钙沉淀有效地自封闭200 µm以下的裂缝。该研究为设计下一代智能ecc建立了基础途径，这对于构建可持续、弹性和智能监控的基础设施系统至关重要，这些系统可以自我诊断损伤和自我恢复寿命。

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引用次数: 0

Study on the fracture characteristics of GO-reinforced cementitious materials using DIC and AE techniques 基于DIC和AE技术的氧化石墨烯增强胶凝材料断裂特性研究

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

Construction and Building Materials

Pub Date : 2026-01-12 DOI: 10.1016/j.conbuildmat.2026.145227

Kai Yang , Jing Chen , Hongniao Chen , Yingjie Xu , Shu Bao , Chenhui Zhu

The inherent brittleness and low tensile strength of cementitious materials like concrete limit its application in high-toughness and durable structures. Recent research suggests that graphene oxide (GO) can be used to modify hydration reaction and enhance interfacial bond in cementitious materials due to its high surface area and abundant oxygen-containing functional groups. To understand the enhancement mechanism of GO on mortar through analysis on crack initiation and evolution, Digital Image Correlation (DIC) and Acoustic Emission (AE) techniques were used to measure deformation and damage evolution of single-edge notched beams under three-point bending tests. The influence of GO content on the evolution of fracture process zone (FPZ) and strength of interfacial transition zone (ITZ) was investigated. Experimental results showed that, with 0.02 wt% GO, the compressive strength, flexural strength and elastic modulus (E) of mortar were increased by 13.2 %, 4.1 %, and 21.4 %, respectively, while fracture energy and characteristic length (L_ch) rose by 11.1 % and 10.4 %, compared with that without GO. DIC analysis showed that GO limit the FPZ evolution, with the FPZ length reduced from 5.406 mm (WT0) to 2.434 mm (WT2). The denser ITZ promoted uniform strain distribution and delayed crack coalescence, consistent with the enhanced fracture resistance observed in GO-modified mortar. AE monitoring in mortar with 0.02 wt% GO showed a 40.7 % reduction in total AE events and lower high-amplitude signals, suppressing microcrack activity and improving fracture resistance. The findings links GO-induced micro-enhancement of ITZ to macroscopic fracture resistance, which can deepen fundamental understanding of GO’s toughening mechanisms and provide reference for designing high-toughness, crack-resistant cement-based composites.

混凝土等胶凝材料固有的脆性和低抗拉强度限制了其在高韧性和耐久性结构中的应用。近年来的研究表明，氧化石墨烯（GO）由于其高的比表面积和丰富的含氧官能团，可以用来修饰胶凝材料中的水化反应，增强界面键合。为了通过裂缝萌生和演化分析来了解氧化石墨烯对砂浆的增强机理，采用数字图像相关（DIC）和声发射（AE）技术对单边缺口梁在三点弯曲试验下的变形和损伤演化进行了测量。研究了氧化石墨烯含量对断裂过程区（FPZ）演化和界面过渡区（ITZ）强度的影响。实验结果表明，添加0.02 wt%氧化石墨烯时，砂浆的抗压强度、抗折强度和弹性模量(E)分别比未添加氧化石墨烯时提高13.2 %、4.1 %和21.4 %，断裂能和特征长度（Lch）分别提高11.1 %和10.4 %。DIC分析表明，GO限制了FPZ的演化，FPZ长度从5.406 mm （WT0）减少到2.434 mm （WT2）。更致密的ITZ促进了应变分布均匀，延迟了裂缝的合并，这与go改性砂浆的抗断裂性能增强一致。在含有0.02 wt%氧化石墨烯的砂浆中进行声发射监测，结果显示声发射总事件减少40.7 %，高振幅信号降低，抑制微裂纹活动，提高抗断裂能力。该研究结果将氧化石墨烯诱导的ITZ微观增强与宏观抗断裂能力联系起来，可以加深对氧化石墨烯增韧机理的基本认识，并为设计高韧性、抗裂水泥基复合材料提供参考。

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