Construction and Building Materials最新文献_第4页

The influence of key design factors on voids characterisation and the balance between permeability and strength performance of porous asphalt concrete 关键设计因素对多孔沥青混凝土孔隙特征及渗透与强度平衡的影响

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

Construction and Building Materials

Pub Date : 2026-01-15 DOI: 10.1016/j.conbuildmat.2025.145085

Xiang Ma , Bin Wu , Jiachen Xu , Jiwang Jiang , Fangyu Huang , Xiaowei Wang

Void parameter is the critical factor to the balance design of drainage function and structural strength of porous asphalt concrete (PAC). However, the comprehensive influence of composition design factors on void characteristics is still unclear. To address this problem, the key factors affecting the composition design of PAC in the three stages of material selection, proportion design and compaction were considered, and the three-dimensional meso void distribution characteristics of PAC were obtained by using X-ray CT scanning and digital image processing technology. Combined with the test results of permeability coefficient and indirect tensile strength, the correlation between permeability and strength performance with void parameters was analyzed. The results showed that the average void coordination number has a better correlation with performance than porosity. The performance is mainly affected by large voids, while small voids exhibit no significant correlation with performance, which may be attributed to the limited detection resolution for submillimeter-scale voids. The shape of coarse aggregate has little effect on the total porosity, but the difference of meso void structure leads to distinct performance variations. Reducing the amount of 0–3 mm fine aggregates is an effective way to improve the permeability of PAC. Excessive compaction times reduce permeability by diminishing void connectivity, while also having the potential to fracture aggregates, thereby compromising the skeletal framework and resulting in strength reduction. The surplus asphalt not only fills small voids, but also reduces the cohesion. Appropriate asphalt content and compaction times are conducive to the balance of permeability and strength of PAC.

孔隙参数是多孔沥青混凝土排水功能与结构强度平衡设计的关键因素。然而，成分设计因素对孔隙特性的综合影响尚不清楚。针对这一问题，考虑了材料选择、比例设计和压实三个阶段影响PAC组成设计的关键因素，并利用x射线CT扫描和数字图像处理技术获得PAC的三维细观空隙分布特征。结合渗透系数和间接抗拉强度的试验结果，分析了渗透性能和强度性能与孔隙参数的相关性。结果表明，平均孔隙配位数与性能的相关性优于孔隙率。性能主要受大孔洞的影响，而小孔洞对性能的影响不显著，这可能与亚毫米尺度孔洞的检测分辨率有限有关。粗集料的形状对总孔隙率影响不大，但介孔结构的不同导致了不同的性能变化。减少0-3 mm细骨料的用量是提高PAC渗透性的有效方法。过度的压实时间会减少孔隙连通性，从而降低渗透性，同时也有可能导致骨料断裂，从而损害骨架框架并导致强度降低。多余的沥青不仅填满了小空隙，而且降低了粘聚力。适当的沥青含量和压实次数有利于PAC的渗透性和强度的平衡。

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引用次数: 0

Effect of moderate-heat cement on the performance and microstructure of UHPC matrix 中热水泥对UHPC基体性能和微观结构的影响

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

Construction and Building Materials

Pub Date : 2026-01-15 DOI: 10.1016/j.conbuildmat.2026.145233

Jinlang Yu , Jianhui Liu , Junyu Chen , Wufeng Wei , Zheng Chen , Caijun Shi , Chaofan Yi

In order to solve the problems of high hydration heat, large autogenous shrinkage and poor workability of ultra-high performance concrete (UHPC), this study investigated the effects of moderate-heat cement (MHC) on the rheological properties, heat of hydration, mechanical properties and microstructure of UHPC matrix with different water-to-binder (w/b) ratios (0.14, 0.16 and 0.18). The results showed that under the same w/b ratio, MHC-based UHPC matrix (M-UHPC matrix) exhibited a 21.7% higher fluidity than ordinary Portland cement-based UHPC matrix（P-UHPC matrix）, along with reductions in yield stress and plastic viscosity by 26.1%-35.5% and 14.2%-30.0% respectively, and weakened shear thickening behavior. The early strength of M-UHPC matrix was lower than that of P-UHPC matrix, but the trend reverses at later stages, with the 180-day compressive strength increasing by 11.7%. This enhancement is attributed to the continuous hydration of C₂S and the refinement of the pore structure, as evidenced by the increase in gel nanopores from 56.3% to 82.2%. The autogenous shrinkage of M-UHPC matrix at 7 days was 10.9% lower than that of P-UHPC matrix; however, reducing the w/b ratio tends to exacerbate autogenous shrinkage. Based on the autogenous shrinkage prediction model derived from the internal relative humidity (IRH) segmentation, a two-stage mechanism is revealed: chemical shrinkage dominates when the IRH is 100%, while capillary negative pressure drives shrinkage when the IRH is less than 100%. This study provides theoretical support and a basis for mix proportion optimization in the engineering application of UHPC with low heat of hydration and reduced shrinkage.

为解决超高性能混凝土（UHPC）水化热高、自收缩大、和易性差的问题，研究了中热水泥（MHC）对不同水胶比（w/b）（0.14、0.16和0.18）下UHPC基体流变学性能、水化热、力学性能和微观结构的影响。结果表明：在相同w/b比下，mhc基UHPC基质（M-UHPC基质）的流动性比普通硅酸盐水泥基UHPC基质（P-UHPC基质）高21.7%，屈服应力和塑性黏度分别降低26.1% ~ 35.5%和14.2% ~ 30.0%，剪切增稠性减弱；M-UHPC基质的早期强度低于P-UHPC基质，但后期趋势逆转，180 d抗压强度增加11.7%。这种增强是由于C2S的持续水化和孔隙结构的细化，凝胶纳米孔从56.3%增加到82.2%。M-UHPC的自收缩率比P-UHPC的自收缩率低10.9%；然而，降低w/b比往往会加剧自收缩。基于内部相对湿度（IRH）分段建立的自收缩预测模型，揭示了两阶段收缩机制：当IRH为100%时，化学收缩占主导地位，而当IRH小于100%时，毛细负压驱动收缩。本研究为低水化热减缩超高性能混凝土的工程应用配合比优化提供了理论支持和依据。

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引用次数: 0

Bond-slip damage characterization of steel tube interfaces with UHP-LAC incorporating solid waste 含固体废物UHP-LAC钢管界面粘结滑移损伤表征

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

Construction and Building Materials

Pub Date : 2026-01-15 DOI: 10.1016/j.conbuildmat.2026.145281

Baichuan Li , Xiaoting Song , Jun Fu , Miao Yang , Haojun Zhu , Hongan Qiu , Zhao Sun , Gaozhan Zhang

The interfacial bonding and shrinkage between the steel tube of the stiffening skeleton and the encased concrete were crucial for the stability of the structure. The core challenge lies in developing an encased concrete that is simultaneously lightweight, low-shrinkage, high-strength, and sustainable. The interfacial bond strength is largely dictated by encased concrete shrinkage, a phenomenon where ultra high performance lightweight aggregate concrete (UHP-LAC) 's inherently low shrinkage makes it ideal for enhancing composite integrity. In this study, UHP-LAC with coal gangue aggregate made from solid waste was prepared. A scaled model with a 1:6 ratio, identical to the engineering prototype, was fabricated. The push-out test of the steel tube filled with solid waste UHP-LAC was conducted. The coupled numerical model integrating the finite element method (FEM) and the discrete element method (DEM) was established. The results revealed that the low water-binder ratio bestowed UHP-LAC with excellent adhesion properties. The interfacial bonding strength between UHP-LAC and the steel tube was significantly enhanced to 1.984 MPa. The damage of UHP-LAC exhibited a progressive fracture development, and the fibers demonstrated damage controllability. The interfacial fibers provided cyclic energy dissipation through frictional resistance by means of bridging slip. During the later stage of the push-out, they offered an interfacial resistance of approximately 0–0.8 kN. In the early stage, the radial stress of the steel tube decreased with the increase in the shrinkage. The wrapped concrete with a shrinkage of 200 με, the radial stress showed a stable decline. For the specimens with a shrinkage of 1600 με, the radial stress dropped sharply at the early stage of loading due to interfacial debonding and increased significantly in the later stage. It was recommended to select UHP-LAC as the wrapped concrete for the steel tube.

加劲骨架钢管与包覆混凝土之间的界面粘结和收缩对结构的稳定性至关重要。核心挑战在于开发一种同时具有轻质、低收缩、高强度和可持续性的封闭式混凝土。界面结合强度很大程度上取决于包裹混凝土的收缩，超高性能轻骨料混凝土（UHP-LAC）固有的低收缩使其成为增强复合材料完整性的理想选择。本研究以固体废弃物为原料制备了煤矸石骨料的UHP-LAC。制作了与工程原型相同的1:6比例的比例模型。对固体废弃物UHP-LAC填充钢管进行了推出试验。建立了有限元法与离散元法相结合的耦合数值模型。结果表明，低水胶比使UHP-LAC具有优异的粘接性能。UHP-LAC与钢管的界面结合强度显著提高，达到1.984 MPa。UHP-LAC的损伤表现为渐进式断裂发展，纤维具有损伤可控性。界面纤维以桥接滑移的方式通过摩擦阻力提供循环能量耗散。在推出的后期阶段，它们提供了大约0-0.8 kN的界面阻力。在收缩初期，钢管径向应力随收缩量的增大而减小。当收缩量为200 με时，包覆混凝土的径向应力呈稳定下降趋势。当收缩率为1600 με时，加载初期由于界面剥离，径向应力急剧下降，加载后期径向应力显著升高。建议选用UHP-LAC作为钢管包覆混凝土。

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引用次数: 0

Performance evaluation of pyrolytic carbon black-modified asphalt mastic with fly ash/calcium carbide slag fillers: Rheology, microwave susceptibility, and self-healing behavior 粉煤灰/电石渣填料热解炭黑改性沥青胶泥的性能评价：流变学、微波敏感性和自愈行为

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

Construction and Building Materials

Pub Date : 2026-01-15 DOI: 10.1016/j.conbuildmat.2026.145279

Xu Li, Yongbao Wang, Xiaolei Zhang, Yunjing Nie, Yang Gao

This study develops a synergistic modified asphalt mastic system using three typical wastes: Pyrolysis Carbon Black (PCB) from waste tires as a modifier, and Fly Ash (FA)/Calcium Carbide Slag (CCS) as alternatives to traditional Limestone Mineral Powder (LMP) fillers. Besides the microscopic characteristics of the PCB and the fillers were analyzed using X-Ray Diffraction (XRD) and Scanning Electron Microscopy (SEM). The rheological properties, the energy utilization efficiency and the self-recovery efficiency were evaluated via Dynamic Shear Rheology (DSR), microwave heating, and fatigue-healing cycle tests. The experimental results show that FA/CCS, which are characterized by small particle sizes and large specific surface areas, show higher integration potential with asphalt. Additionally, FA/CCS enhance the microwave heating efficiency and self-healing capability of asphalt mastic. While PCB can improve most of the characteristics of asphalt mastic, the saturation point and degree of improvement vary form the type of asphalt mastic. The FAM with 10 % PCB shows a 17.1 % higher microwave energy utilization efficiency compared with FAM without PCB. It also exhibits a higher complex shear modulus (G*) and a higher energy-based self-healing index (HI₁) at 46°C. The CCSM with 10 % PCB also outperforms CCSM without PCB, with a 7.3 % increase in microwave energy utilization efficiency, a 30 % increase in G* at 46°C, and a 56.3 % increase in HI₁. These results confirm that FA/CCS combined with PCB can significantly improve the high-temperature performance, microwave responsiveness and self-healing ability of asphalt mastic. A high-value utilization path for industrial solid wastes in pavement engineering is also provided.

本研究利用三种典型废弃物：废轮胎的热解炭黑（PCB）作为改性剂，粉煤灰(FA)/电石渣（CCS）作为传统石灰石矿物粉（LMP）填料的替代品，开发了一种增效改性沥青胶泥体系。此外，利用x射线衍射仪（XRD）和扫描电子显微镜（SEM）分析了PCB和填料的微观特征。通过动态剪切流变学（DSR）、微波加热和疲劳愈合循环试验，对其流变学性能、能量利用效率和自恢复效率进行了评价。实验结果表明，FA/CCS具有粒径小、比表面积大的特点，与沥青具有较高的结合潜力。此外，FA/CCS还能提高沥青胶泥的微波加热效率和自愈能力。PCB可以改善沥青胶泥的大部分特性，但其饱和点和改善程度因沥青胶泥的种类而异。与不含PCB的FAM相比，含有10 % PCB的FAM的微波能量利用效率提高了17.1 %。在46°C时，它还表现出更高的复杂剪切模量（G*）和更高的基于能量的自愈指数（HI₁）。含有10 % PCB的CCSM也优于没有PCB的CCSM，微波能量利用效率提高了7.3% %，46°C时G*增加了30 %，HI 1增加了56.3% %。这些结果证实，FA/CCS与PCB复合可以显著提高沥青胶泥的高温性能、微波响应性和自愈能力。为工业固体废物在路面工程中的高价值利用提供了一条途径。

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引用次数: 0

Evaluation of EAF steel slag as aggregate replacement in LCC-based roller-compacted concrete pavements EAF钢渣在lcc基碾压混凝土路面中替代骨料的性能评价

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

Construction and Building Materials

Pub Date : 2026-01-15 DOI: 10.1016/j.conbuildmat.2026.145244

Vaibhav Vilasrao Butle , D. Sitarami Reddy , V. Srinivasan

The growing demand for sustainable construction materials has accelerated the use of supplementary cementitious materials (SCMs) and industrial by-products in concrete, with roller-compacted concrete pavement (RCCP) emerging as a suitable application. This study developed RCCP incorporating a 50 % limestone–calcined clay (LCC) binder and electric arc furnace (EAF) steel slag as a coarse aggregate replacement (25–100 %) to address the early-age strength limitation of LCC. Slag incorporation increased optimum moisture content by 22–36 %, reduced densities due to its porous structure, and produced faster response to compaction, while all mixes maintained compaction ratios above 97 %. In terms of strength, slag improved aggregate interlock and the interfacial transition zone (ITZ), enhancing early-age performance by 17–26 % compared with the LCC-only mix. The mixture with 50 % slag showed the most balanced overall behaviour, being 9 % lower at 7 days yet surpassing the reference RCCP by 5 % at 28 days and remaining within 6 % at 90 days, with flexural and splitting tensile strengths displaying similar trends. Although stiffness parameters decreased with slag content, reductions at 50 % replacement were moderate. Statistical analysis confirmed a significant influence of slag on fresh and early-age properties, while the 50 % slag mix achieved statistical equivalence with the reference RCCP from 7 days onward. Overall, the study establishes 50 % coarse slag replacement in RCCP mixes containing a 50 % LCC blend as the optimum synergy, effectively overcoming early-age limitations while advancing sustainability for pavement applications.

对可持续建筑材料的需求不断增长，加速了混凝土中补充胶凝材料（scm）和工业副产品的使用，碾压混凝土路面（RCCP）成为一种合适的应用。为了解决LCC的早期强度限制，本研究开发了RCCP，该RCCP采用50% %的石灰石煅烧粘土（LCC）粘结剂和电弧炉（EAF）钢渣作为粗骨料替代（25-100 %）。掺渣使最佳含水率提高了22 ~ 36 %，由于其多孔结构降低了密度，对压实的响应速度更快，而所有混合料的压实率都保持在97 %以上。在强度方面，矿渣改善了骨料互锁和界面过渡区（ITZ），早期性能比纯lcc提高了17-26 %。含有50% %矿渣的混合料表现出最平衡的总体行为，在第7天降低了9 %，但在第28天超过了参考RCCP 5 %，在第90天保持在6 %以内，弯曲和分裂抗拉强度表现出类似的趋势。虽然刚度参数随着矿渣含量的增加而降低，但在50% %替代时，降低幅度不大。统计分析证实了矿渣对新鲜和早期性能的显著影响，而50% %的矿渣混合物在7天后与参考RCCP达到了统计等效。总体而言，该研究建立了含有50% % LCC混合料的RCCP混合料中50% %粗渣替代作为最佳协同作用，有效克服了早期的限制，同时提高了路面应用的可持续性。

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引用次数: 0

Performance evaluation and correlation analysis of UV aged asphalt mixture and its extracted asphalt UV老化沥青混合料及其提取沥青的性能评价及相关性分析

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

Construction and Building Materials

Pub Date : 2026-01-15 DOI: 10.1016/j.conbuildmat.2026.145272

Songtao Lv , Zihao Ju , Dongdong Ge , Yonghou Bai , Zhihui Li

UV radiation induced cracking of asphalt pavements predominantly occurred in the surface layer. Therefore, the loose asphalt mixtures were subjected to UV aging prior to specimen preparation. This study focused on assessing the influence of UV radiation on the properties of surface asphalt mixtures and their extracted binders. Moreover, the correlations between mixture performance and binder evaluation parameters were established, and key binder indexes were proposed as reliable predictors of mixture durability. Based on test results, UV radiation significantly increased mixture stiffness and strength index, the splitting strength increased by 141 %-176 %. However, these enhancements were primarily due to binder hardening and embrittlement rather than performance improvement. UV aging markedly deteriorated the low-temperature cracking resistance, moisture susceptibility, and fatigue performance of the mixture. After undergoing 9 cycles of UV aging, the tensile strength ratio (TSR) decreased to 57 %, the fracture energy dropped by 43.3 %, and the fatigue life reduced to merely 2.6 % of unaged mixture, nearly losing its capacity to withstand cyclic loading. UV radiation also caused the extracted asphalt to become more brittle and stiffer. The rheological behavior of the extracted asphalt further confirmed the impact of UV radiation on performance degradation. Based on correlation analysis, the highly correlated indices (rutting factor, N_f2.5 %, N_f5 %, I_S_O, and I_C_O) were the critical indicators for evaluating the durability of UV aged mixtures and could be directly applied in performance prediction and service life assessment. This research will offer a scientific basis for the design of durable pavement materials in high-altitude regions with intense UV radiation.

紫外线辐射引起的沥青路面开裂主要发生在路面表层。因此，松散的沥青混合料在试样制备之前经受紫外线老化。本研究的重点是评估紫外线辐射对表面沥青混合料及其提取粘合剂性能的影响。建立了混合料性能与粘结剂评价参数之间的相关性，提出了粘结剂关键指标作为混合料耐久性的可靠预测指标。试验结果表明，紫外辐射显著提高了混合材料的刚度和强度指标，劈裂强度提高了141 %-176 %。然而，这些增强主要是由于粘合剂硬化和脆化，而不是性能的提高。UV老化显著降低了混合料的低温抗裂性能、湿敏感性和疲劳性能。经过9次UV老化后，其抗拉强度比（TSR）降至57 %，断裂能下降43.3% %，疲劳寿命降至仅为未老化混合物的2.6 %，几乎失去了承受循环载荷的能力。紫外线辐射也使提取的沥青变得更脆、更硬。提取沥青的流变行为进一步证实了紫外线辐射对性能退化的影响。通过相关分析，车情因子、Nf2.5 %、Nf5 %、ISO和ICO是评价UV老化混合料耐久性的重要指标，可直接应用于性能预测和使用寿命评估。该研究将为高海拔紫外线辐射强地区耐用路面材料的设计提供科学依据。

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引用次数: 0

Anisotropy and mechanical enhancement of 3D-printed vitrified microsphere thermal insulation mortar incorporating basalt fiber under different printing paths 不同打印路径下玄武岩纤维3d打印玻璃化微球保温砂浆的各向异性及力学增强

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

Construction and Building Materials

Pub Date : 2026-01-15 DOI: 10.1016/j.conbuildmat.2026.145282

Guixiang Chen , Xuanzheng Zhang , Jun Wang , Kui Hu , Junhui Duan , Boyi Zhao

3D-printed vitrified microsphere thermal insulation mortar (3DP-VMIM) possesses excellent thermal insulation but insufficient strength and anisotropy control. This study explores the combined effects of basalt fiber (BF) incorporation and printing path on its anisotropic and mechanical behaviors. Mortars with five BF contents (0, 0.3 %, 0.6 %, 0.9 %, 1.2 %) are printed using parallel (Path-A) and cross (Path-B) interlayer paths, and tested for fluidity, shape retention, dry density, thermal conductivity, and strength, complemented by SEM analysis. As BF content increases, fluidity decreases while shape retention improves; shape retention exceeds 80 % after 60 min when BF ≥ 0.9 %. The dry density and thermal conductivity of 3DP-VMIM peak at 0.9 % BF. Due to the mechanical interlocking effect mitigating the adverse impact of interlayer weak planes, Path-B exhibits significantly superior mechanical performance and density compared to Path-A. Moreover, Path-A and Path-B exhibit optimal compressive strength in the X and Y directions, respectively, while their flexural strength peaks in the Y and Z directions, respectively. In Path-A, the X-direction is more affected by interstrip and interlayer weak planes, resulting in a thermal conductivity pattern of X > Y > Z. In Path-B, the Y-direction exhibits more pronounced weakening from interstrip interfaces, resulting in Y > X > Z. Moderate BF addition improves interfacial bonding, while excessive fiber causes agglomeration. Overall, the optimal BF content is 0.9 %. Although sacrifices some thermal insulation performance, it yields the best mechanical properties. Path-A demonstrates superior thermal insulation performance, while Path-B exhibits stronger mechanical properties and enhanced anisotropy stability.

3d打印玻璃化微球保温砂浆（3d - vmim）具有良好的保温性能，但强度和各向异性控制能力不足。研究了玄武岩纤维掺入量和印刷路径对其各向异性和力学性能的综合影响。采用平行（路径a）和交叉（路径b）层间路径打印5种BF含量（0、0.3 %、0.6 %、0.9 %、1.2 %）的砂浆，测试其流动性、保形性、干密度、导热性和强度，并进行SEM分析。随着BF含量的增加，流动性降低，形状保持度提高；当BF≥ 0.9 %时，60 min后形状保持率超过80 %。3DP-VMIM的干密度和导热系数在0.9 % BF时达到峰值。由于机械联锁效应减轻了层间弱面的不利影响，路径b的力学性能和密度明显优于路径a。路径a和路径b的抗压强度分别在X和Y方向上表现最佳，抗折强度分别在Y和Z方向上达到峰值。在路径a中，X方向受条带间和层间弱面影响较大，导致导热模式为X >； Y >； Z。在路径b中，Y方向从带间界面处减弱更为明显，产生Y >； X >； Z。适量的BF添加量可以改善界面粘合，而过量的纤维则会导致结块。综合考虑，最佳BF含量为0.9 %。虽然牺牲了一些隔热性能，但它产生了最好的机械性能。Path-A具有较好的保温性能，而Path-B具有较强的力学性能和增强的各向异性稳定性。

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引用次数: 0

Performance degradation mechanism of UHPC under combined thermal and sulfate exposure: A study of one-dimensional erosion in harsh environments 高温和硫酸盐复合暴露下UHPC性能退化机理：恶劣环境下一维侵蚀的研究

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

Construction and Building Materials

Pub Date : 2026-01-15 DOI: 10.1016/j.conbuildmat.2025.144642

Jie Wu , Yan Wang , Shaohui Zhang , Pei Wang , Chenyu Gao , Zifan Yang , Tianfeng Chang , Ditao Niu

Concrete structures in tunnel, underground, and oil field environments are vulnerable to high temperature and SO₄^2 − attack, leading to one-dimensional erosion and structural damage, a pattern not well studied despite the recommendation of UHPC for such conditions. This study investigated the long-term (360 d) degradation of UHPC under temperature (20, 40, 60 and 80 °C) and SO₄²⁻ (10 % Na₂SO₄) one-dimensional erosion conditions. Results show that while mechanical properties initially improve, they deteriorate over time, with higher temperatures accelerating this process. At 60 °C and 80 °C, degradation begins after 180 d, while at 40 °C it occurs after 270 d. Specifically, rod-like AFt forms at 40 and 60 °C, and long lath-like AFt forms at 80 °C. These crystallization products generate expansion pressure, leading to microcracking and increased porosity of 56.79 % and 70.24 % at 60 and 80 °C, respectively. Elevated temperatures reduce the electrical resistivity, making the steel fibers in the top 5 mm layer highly susceptible to corrosion, whereas SO₄²⁻ is more easily transported in loose oxides. These findings underscore the importance of considering both temperature and salt conditions in UHPC applications.

隧道、地下和油田环境中的混凝土结构容易受到高温和SO42 -攻击，导致一维侵蚀和结构破坏，尽管UHPC推荐用于此类条件，但这种模式尚未得到很好的研究。研究了UHPC在温度（20、40、60和80℃）和SO42−（10 % Na2SO4）一维侵蚀条件下的长期（360 d）降解。结果表明，虽然机械性能最初有所改善，但随着时间的推移，它们会恶化，高温会加速这一过程。在60°C和80°C时，降解在180 d后开始，而在40°C时，降解在270 d后开始。具体而言，在40°C和60°C形成棒状AFt，在80°C形成长板条状AFt。这些结晶产物产生膨胀压力，导致微开裂，孔隙率在60℃和80℃时分别增加56.79 %和70.24 %。升高的温度降低了电阻率，使得顶部5 mm层的钢纤维极易受到腐蚀，而SO42−更容易以松散的氧化物形式传输。这些发现强调了在UHPC应用中同时考虑温度和盐条件的重要性。

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引用次数: 0

Design of 8-hydroxyquinoline functionalized MgAl layered double hydroxide films on steel surfaces for the self-healing corrosion protection of reinforced concrete 钢筋混凝土表面8-羟基喹啉功能化MgAl层状双氢氧化物膜的自愈防腐设计

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

Construction and Building Materials

Pub Date : 2026-01-15 DOI: 10.1016/j.conbuildmat.2026.145207

Qingrui Yang, Xiaowei He, Xiang Wang, Wenjie Liu, Lu Wang, Yuanyuan Zhang, Shengxin Fan, Biqin Dong, Shuxian Hong

Steel protective coatings are commonly used to enhance the durability of reinforced concrete (RC) structures. However, conventional coatings can inadvertently accelerate localized corrosion through galvanic effects at micro-defect sites. To address this critical limitation, self-healing coatings capable of autonomous defect repair are urgently needed. This study developed a novel self-healing 8-hydroxyquinoline-functionalized MgAl layered double hydroxide (8HQ@MgAl LDH) film through hydrothermal synthesis and alkaline-induced restructuring. This innovative design integrates 8HQ⁻-intercalated LDH layers for inhibitor storage with epitaxially grown Mg(HQ)₂ crystalline barriers, formed through Mg²⁺ coordination. Electrochemical impedance spectroscopy analysis of the chloride-contaminated simulated concrete pore solution demonstrated exceptional performance, revealing fivefold higher low-frequency impedance than conventional LDH after 15 days. Artificial scratch tests demonstrated autonomous healing capability, maintaining electrochemical stability (<5 % impedance fluctuation over 96 h) while forming a regenerated barrier enriched with corrosion-inhibiting elements. The atomic-scale mechanism was further investigated using molecular dynamics simulations, which revealed that 8HQ⁻ anions formed interfacial clusters through bidentate coordination with Fe³ ⁺ and Ca²⁺, thus effectively blocking Cl⁻ adsorption.

钢保护涂层通常用于增强钢筋混凝土（RC）结构的耐久性。然而，传统的涂层可能会在微缺陷部位通过电偶效应无意中加速局部腐蚀。为了解决这一关键限制，迫切需要能够自主修复缺陷的自修复涂层。本研究通过水热合成和碱诱导重组制备了一种具有自修复功能的8-羟基喹啉功能化MgAl层状双氢氧化物（8HQ@MgAl LDH）薄膜。该创新设计将用于抑制剂储存的8HQ -插入LDH层与外延生长的Mg(HQ) 2晶体屏障结合在一起，通过Mg 2 +配合形成。电化学阻抗谱分析表明，氯化物污染的模拟混凝土孔隙溶液表现出优异的性能，15天后的低频阻抗比常规LDH高5倍。人工划痕测试显示了自主修复能力，在形成富含缓蚀元素的再生屏障的同时，保持了电化学稳定性（<；5 %阻抗波动超过96 h）。通过分子动力学模拟进一步研究了原子尺度上的机理，发现8HQ⁻+与Fe³ +、Ca 2 +通过双齿配位形成界面团簇，有效阻断了Cl⁻的吸附。

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引用次数: 0

Mechanical force/chloride triggered microcapsules reboot geopolymer durability: Interfacial bond networks driving self-healing under salt-dry-wet cycles 机械力/氯化物触发微胶囊重新启动地聚合物耐久性：界面键网络在盐-干-湿循环下驱动自愈

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

Construction and Building Materials

Pub Date : 2026-01-15 DOI: 10.1016/j.conbuildmat.2026.145278

Yongming Han , Lu Zhou , Dehong Wang , Yanzhong Ju , Yuchen Guo , Wenting Dai

To address deterioration of durability and high-brittleness cracking in geopolymers under complex salt erosion, this study designed a mechanical-force/chloride-triggered microcapsule self-healing system that activates within geopolymers under chloride-sulfate wet-dry cycling conditions. Hybrid microcapsules achieve synchronous core hexamethylene diisocyanate (HDI) release through crack-tip stress and chloride-induced shell dissolution. At the optimal dosage (1.5 wt%), the synergistic triggering mechanism enhances impermeability by 8.32 %, reduces pest hole (pores size > 0.1 μm) proportion by 52.7 %, and decreases compressive strength loss by 13.23 %. After 150 cycles of dry-wet chlorine salt-sulfate exposure, the relative dynamic elastic modulus remains above 60 %, confirming that the healing agent simultaneously reduces ion migration channels and suppresses pest hole expansion. Microscopic experiments and molecular dynamics studies reveal that at the repair product interface—formed by HDI reacting with hydroxyl groups—the binding energy between polyurethane (PU) and sodium aluminosilicate hydrate (N-A-S-H) gel increases by 9.53 % compared to the polyurea (PUA) system. The ester groups in PU coordinate to form an ordered hydrogen-bond network, exhibiting a 398 % increase in O-H bonds. Under salt erosion, PU demonstrates significantly superior interfacial stability with N-A-S-H gel over PUA. The spatial confinement of sodium ions within PU inhibits Cl⁻/

{SO}_{4}^{2 -}

migration. This research establishes a cross-scale design paradigm for self-healing geopolymer durability in harsh environments.

为了解决复杂盐侵蚀下地聚合物耐久性恶化和高脆性开裂问题，本研究设计了一种机械力/氯化物触发的微胶囊自修复系统，该系统在氯化物-硫酸盐干湿循环条件下在地聚合物中激活。杂化微胶囊通过裂纹尖端应力和氯化物诱导的壳溶出实现核心六亚甲基二异氰酸酯（HDI）的同步释放。在最佳投加量（1.5 wt%）下，协同触发机制可使抗渗性能提高8.32 %，气孔（孔隙尺寸 >； 0.1 μm）比例降低52.7 %，抗压强度损失降低13.23 %。在干湿氯盐-硫酸盐作用150次后，相对动态弹性模量保持在60 %以上，证实了愈合剂在减少离子迁移通道的同时抑制了虫孔的扩张。微观实验和分子动力学研究表明，在HDI与羟基反应形成的修复产物界面上，聚氨酯（PU）与水合硅酸铝钠（N-A-S-H）凝胶的结合能比聚脲（PUA）体系提高了9.53 %。PU中的酯基相互配合形成有序的氢键网络，O-H键增加398 %。在盐侵蚀作用下，PU与N-A-S-H凝胶的界面稳定性明显优于PUA。PU内钠离子的空间限制抑制Cl - /SO42−迁移。本研究建立了一个在恶劣环境中自愈地聚合物耐久性的跨尺度设计范例。

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引用次数: 0