The influence of chloride-sulfate attack history on the residual mechanical properties of concrete after high temperatures

IF 3.4 3区工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY

Materials and Structures Pub Date : 2024-10-25 DOI:10.1617/s11527-024-02492-x

Jinyu Qin, Xinxin Liu, Shouxing Wang, Maqian Yang, Jinwen Sun, Limin Lu, Yongsheng Ji

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Abstract

Durability studies of basalt fiber reinforced concrete (BFRC) structures are still in their infancy. New breakthroughs are needed in the exploration of the mechanical properties of BFRC under the coupling effect of multiple factors. In order to release the influence of composite chloride-sulfate attack history on the fire resistance of BFRC, mechanical experiments were carried out on BFRC specimens, which were first soaking in a certain concentration of chloride-sulfate composite solution, and then submitted to different high temperatures. The compressive strength, relative dynamic elastic modulus and the residual compressive strength of the specimens after high temperatures were tested. The results show that compared with chloride concentration, sulfate concentration has a greater effect on the compressive strength and relative dynamic elastic modulus of BFRC. The presence of chloride can inhibit the attack of sulfate in the concrete and reduce the change in strength at room temperature. The combined attack of chloride and sulfate aggravates the strength deterioration of the BFRC specimens after high temperatures.

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氯化物-硫酸盐侵蚀历史对高温后混凝土残余力学性能的影响

玄武岩纤维增强混凝土（BFRC）结构的耐久性研究仍处于起步阶段。多因素耦合作用下的玄武岩纤维增强混凝土力学性能探索亟待新的突破。为了揭示氯酸盐-硫酸盐复合侵蚀历史对 BFRC 耐火性能的影响，我们对 BFRC 试件进行了力学实验，先将试件浸泡在一定浓度的氯酸盐-硫酸盐复合溶液中，然后置于不同的高温条件下。测试了试样的抗压强度、相对动态弹性模量和高温后的残余抗压强度。结果表明，与氯化物浓度相比，硫酸盐浓度对 BFRC 的抗压强度和相对动态弹性模量的影响更大。氯化物的存在可以抑制硫酸盐对混凝土的侵蚀，减少常温下强度的变化。氯化物和硫酸盐的联合侵蚀加剧了 BFRC 试件在高温后的强度劣化。

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来源期刊

Materials and Structures 工程技术-材料科学：综合

CiteScore

6.40

自引率

7.90%

发文量

222

审稿时长

5.9 months

期刊介绍： Materials and Structures, the flagship publication of the International Union of Laboratories and Experts in Construction Materials, Systems and Structures (RILEM), provides a unique international and interdisciplinary forum for new research findings on the performance of construction materials. A leader in cutting-edge research, the journal is dedicated to the publication of high quality papers examining the fundamental properties of building materials, their characterization and processing techniques, modeling, standardization of test methods, and the application of research results in building and civil engineering. Materials and Structures also publishes comprehensive reports prepared by the RILEM’s technical committees.