高温后玄武岩纤维增强高强砂浆力学性能及抗氯离子渗透性能研究

doi:10.16552/j.cnki.issn1001-1625.2024.1307

摘要/Abstract

摘要： 玄武岩纤维增强高强砂浆(BFHSM)因轻质高强、耐久性好等特点,具有广泛的工程应用前景。高温作用后的力学性能及耐久性是评价结构安全性能的重要指标。本文通过高温试验、抗压强度及劈裂抗拉强度试验、XRD分析和抗氯离子渗透性能试验,研究了温度(20、100、150、200、250、300、350、400 ℃)对玄武岩纤维(BF)掺量为0%(体积分数,下同)和1.0%的BFHSM力学性能及抗氯离子渗透性能的影响。结果表明,随温度升高,BFHSM的抗压强度、劈裂抗拉强度均呈先上升后下降趋势,且掺入BF能提高抗压强度和劈裂抗拉强度。XRD分析发现,超过临界温度后,BFHSM基体中水化硅酸钙(C-S-H)凝胶及硅酸二钙(C₂S)、硅酸三钙(C₃S)逐渐减少,这是BFHSM抗压强度降低的主要原因。掺入BF能提高BFHSM高温后的抗氯离子渗透性能,与对照组相比,BFHSM的电通量在20、100、200、300 ℃后分别减小了19.82%、5.33%、7.61%、2.21%,且抗氯离子渗透性能均随温度升高而降低。

关键词: 高强砂浆, 玄武岩纤维, 高温, 抗压强度, 劈裂抗拉强度, 电通量

Abstract: Basalt fiber reinforced high-strength mortar (BFHSM) has a bright prospect of applications in engineering due to its lightweight, high strength, and great durability. The mechanical properties and durability after high temperature are important indicators for evaluating structural safety performance. In this paper, the effect of temperature (20, 100, 150, 200, 250, 300, 350, 400 ℃) on the mechanical properties and the chloride ion penetration resistance of BFHSM with basalt fiber (BF) content of 0% (volume fraction, the same below) and 1.0% were investigated by high temperature test, compressive strength test, splitting tensile strength test, XRD analysis, and chloride ion penetration resistance test. The results show that the compressive strength and splitting tensile strength of BFHSM increase first and then decrease, and the compressive strength and splitting tensile strength can be improved with BF. XRD results indicate that the hydrated calcium silicate (C-S-H) gel, dicalcium silicate (C₂S) and tricalcium silicate (C₃S) in BFHSM matrix gradually decrease after the temperature exceeds the critical temperature, which is the main reason for the decrease in compressive strength of BFHSM. Also, the incorporation of BF can improve the chloride ion penetration resistance of BFHSM. Compared with the control group, the electric flux of BFHSM decreases by 19.82%, 5.33%, 7.61%, and 2.21% after 20, 100, 200 and 300 ℃, respectively. Moreover, the chloride ion penetration resistance of BFHSM decreases with the increase of temperature.

Key words: high-strength mortar, basalt fiber, high temperature, compressive strength, splitting tensile strength, electric flux

中图分类号:

TU528

高永红, 李佳好, 金清平, 彭梦蜜. 高温后玄武岩纤维增强高强砂浆力学性能及抗氯离子渗透性能研究[J]. 硅酸盐通报, 2025, 44(6): 2016-2025.

GAO Yonghong, LI Jiahao, JIN Qingping, PENG Mengmi. Mechanical Properties and Chloride Ion Penetration Resistance of BFHSM after High Temperature[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(6): 2016-2025.

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