Effects of pH value and temperature in pore solution of carbonated SCM concrete on creep rupture performance of BFRP bars

IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials Pub Date : 2024-11-15 DOI:10.1016/j.conbuildmat.2024.139160

Lijie Chen , Kun Liang , Ray Kai Leung Su , Zhenyu Huang

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Abstract

The mechanical performance of basalt fiber reinforced polymer (BFRP) bars can deteriorate as a result of creep rupture due to sustained loading and alkaline corrosion caused by concrete alkalinity. Unfortunately, the effect of alkaline corrosion on the creep rupture performance of BFRP bars remains unclear. This study aims to investigate the effects of the pH value and temperature of the simulated pore solution of supplementary cementitious material (SCM) seawater sea sand concrete (SWSSC) subject to carbonation, on the creep rupture of BFRP bars. The pH value, chemical composition of pore solution, phase composition and pore structure of SCM concrete subject to natural carbonation have been characterized. The creep rupture performance of BFRP bars in simulated pore solutions have been tested at various pH values (9.0, 11.0 and 13.5) and temperatures (25 °C, 45 °C and 65 °C). A theoretical model for predicting the creep rupture strength of BFRP bars in air, simulated pore solution and real concrete environments has been developed and validated in comparison with experimental data in existing literature. Experimental results suggest that reducing the pH value (down to 10–11) and temperature of the pore solution can significantly improve the creep rupture performance of BFRP bars. The application of limestone calcined clay cement (LC³) concrete and concrete carbonation is promising in mitigating the alkaline corrosion effect on the creep rupture performance of BFRP bars by lowering pH values, as evidenced by the improvements of creep rupture strength at one million hours of OPC concrete, from 24.1 % to 50.3 % and 71.2 %, respectively.

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碳酸化 SCM 混凝土孔隙溶液中的 pH 值和温度对 BFRP 钢筋徐变断裂性能的影响

玄武岩纤维增强聚合物（BFRP）棒材的机械性能会因持续加载导致的蠕变断裂和混凝土碱度引起的碱性腐蚀而恶化。遗憾的是，碱性腐蚀对 BFRP 钢筋蠕变断裂性能的影响仍不清楚。本研究旨在探讨碳化作用下的辅助胶凝材料（SCM）海水海砂混凝土（SWSSC）模拟孔隙溶液的 pH 值和温度对 BFRP 钢筋徐变断裂的影响。对自然碳化的 SCM 混凝土的 pH 值、孔隙溶液的化学成分、相组成和孔隙结构进行了表征。在不同的 pH 值（9.0、11.0 和 13.5）和温度（25 °C、45 °C 和 65 °C）下，测试了 BFRP 钢筋在模拟孔隙溶液中的蠕变断裂性能。建立了一个理论模型，用于预测 BFRP 钢筋在空气、模拟孔隙溶液和实际混凝土环境中的蠕变断裂强度，并与现有文献中的实验数据进行了对比验证。实验结果表明，降低孔隙溶液的 pH 值（低至 10-11）和温度可显著改善 BFRP 钢筋的蠕变断裂性能。石灰石煅烧粘土水泥（LC3）混凝土和混凝土碳化的应用有望通过降低 pH 值减轻碱性腐蚀对 BFRP 钢筋徐变断裂性能的影响，这一点从 OPC 混凝土一百万小时徐变断裂强度分别从 24.1% 提高到 50.3% 和 71.2% 可以看出。

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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.