Bond-behavior of PCM-fire damaged concrete interface under hygrothermal environment

IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Construction and Building Materials Pub Date : 2024-11-16 DOI:10.1016/j.conbuildmat.2024.139171

Yi Wang , Zhiming Zhao , Shiyi Wang , Zhiyun Deng , Jun Deng

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Abstract

When Polymer cement mortar (PCM) is utilized to strengthen fire damaged concrete, the bond behavior between PCM and concrete remains unknown, particularly under hygrothermal environment. To investigate the bond performance of PCM-fire damaged concrete interface and analyze the failure modes, splitting tensile tests on both single fire damaged concrete specimens and PCM-fire damaged concrete composite specimens were conducted in this study. The influence of different water to cement ratios (W/C) of concrete, elevated temperatures and moisture content were taken into consideration. The results reveal that the decline in bond performance of composite specimens is highly consistent with that of single concrete specimens. Under different exposure conditions, the splitting tensile strength of single concrete specimens and composite specimens decreased up to 68.34% and 47.58%, respectively. The effect of moisture content on bond-behavior of composite specimens was more pronounced than that on single concrete specimens, and the impact was more significant with higher W/C and elevated temperature. Additionally, the failure mode of composite specimens gradually shifted from adhesive failure to cohesive failure due to the deterioration of concrete performance. Finally, a model was developed to predict the splitting tensile strength of PCM-fire damaged concrete interfaces under hygrothermal conditions, which has a good agreement with experimental values.

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湿热环境下 PCM 火损混凝土界面的粘结行为

在使用聚合物水泥砂浆 (PCM) 加固火损混凝土时，PCM 与混凝土之间的粘结行为仍是一个未知数，尤其是在湿热环境下。为了研究 PCM 与火损混凝土界面的粘结性能并分析其破坏模式，本研究对单个火损混凝土试样和 PCM 与火损混凝土复合试样进行了劈裂拉伸试验。试验考虑了不同混凝土水灰比 (W/C)、高温和含水量的影响。结果表明，复合试件粘结性能的下降与单一混凝土试件高度一致。在不同的暴露条件下，单一混凝土试件和复合试件的劈裂抗拉强度分别下降了 68.34% 和 47.58%。含水率对复合试件粘结行为的影响比对单个混凝土试件的影响更明显，而且在含水率和温度升高时影响更大。此外，由于混凝土性能的恶化，复合试件的破坏模式逐渐从粘接破坏转变为内聚破坏。最后，建立了一个模型来预测 PCM-火灾受损混凝土界面在湿热条件下的劈裂拉伸强度，该模型与实验值吻合良好。

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来源期刊

Construction and Building Materials 工程技术-材料科学：综合

CiteScore

13.80

自引率

21.60%

发文量

3632

审稿时长

82 days

期刊介绍： Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged. Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.