Mechanical performance of TRUHPC composites under freeze-thaw cycles

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

Construction and Building Materials Pub Date : 2025-10-02 DOI:10.1016/j.conbuildmat.2025.143836

Yijiang Liu , Chaoyang Zhou , Ridho Surahman , Lina Wang , Yi Wang , Tamon Ueda , Kohei Nagai

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Abstract

This study aims to analyze the durability of textile-reinforced ultra-high-performance concrete (TRUHPC) composites under freeze-thaw cycles (FTCs). To clarify the frost resistance mechanism, mechanical property tests of the UHPC matrix, pullout tests of carbon fiber-reinforced polymer (CFRP) grid-UHPC matrix interfaces, and axial tensile tests of the TRUHPC plates were conducted. In addition, changes in microstructure were also evaluated quantitatively through thermogravimetric and mercury intrusion porosimetry tests, and qualitatively through scanning electron microscopy test. The results showed that after subjected to 100 FTCs, the rehydration products primarily accumulated at the interfacial transition zone (ITZ) between the steel fibers-matrix, rather than at the CFRP grid-matrix interface, resulting in a denser microstructure. Consequently, the flexural strength of the matrix was significantly increased by approximately 52.9 %, which enhanced the tensile properties of the TRUHPC composite. However, as the number of FTCs increased, the flexural strength of matrix, the pullout strength of CFRP grid-UHPC interface, and tensile strength of TRUHPC composite reduced obviously due to greater frost damage and higher stress concentration at the steel fibers-matrix and CFRP grid-matrix interfaces. Even so, the compressive strength of the hybrid fiber UHPC matrix almost constant even after 700 FTCs.

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冻融循环作用下TRUHPC复合材料力学性能研究

本研究旨在分析纺织增强高性能混凝土（TRUHPC）复合材料在冻融循环（FTCs）下的耐久性。为明确其抗冻机理，开展了UHPC基体力学性能试验、碳纤维增强聚合物（CFRP）网格-UHPC基体界面拉拔试验和TRUHPC板轴向拉伸试验。此外，还通过热重法和压汞孔隙法测试定量评价了微观结构的变化，并通过扫描电镜测试定性评价了微观结构的变化。结果表明：经100次FTCs处理后，再水化产物主要积聚在钢纤维-基体之间的界面过渡区（ITZ），而不是在CFRP网格-基体界面处，导致微观结构更加致密；因此，基体的抗弯强度显著提高了约52.9% %，增强了TRUHPC复合材料的拉伸性能。然而，随着纤维增强纤维数量的增加，由于钢纤维-基体和CFRP网格-基体界面处的霜冻损伤更大，应力集中程度更高，导致基体的抗弯强度、CFRP网格- uhpc界面的拉拔强度和TRUHPC复合材料的抗拉强度明显降低。即便如此，混杂纤维UHPC基体的抗压强度即使在700 FTCs之后也几乎保持不变。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.