静力荷载下橡胶水泥砂浆力学性能及微观结构研究

doi:10.16552/j.cnki.issn1001-1625.2024.1136

摘要/Abstract

摘要： 为深入探究废弃橡胶颗粒粒径与取代率对静力荷载作用下水泥砂浆力学性能的影响规律,选取3种橡胶粒径(0.100、0.425、2.000 mm),分别按0%、5%、10%、15%、20%的体积分数取代天然砂,进行抗压、抗折和劈裂抗拉强度试验,并结合压汞测试、扫描电子显微镜分析、能谱分析,研究橡胶颗粒对水泥砂浆力学性能的影响机理。结果表明,橡胶水泥砂浆的抗压、抗折及劈裂抗拉强度均随橡胶取代率增大而减小,粒径对砂浆强度的影响不太明显。当橡胶取代率从5%增至20%时,橡胶水泥砂浆的28 d抗压强度降幅达到27.2%~61.0%,抗折强度降幅达到22.5%~31.7%,劈裂抗拉强度降幅为30.0%~38.9%。折压比随取代率、粒径增大而增大。橡胶砂浆试件的总孔隙率和平均孔径总体与抗压、抗折和劈裂抗拉强度呈负相关。

关键词: 橡胶水泥砂浆, 橡胶粒径, 橡胶取代率, 力学性能, 微观结构

Abstract: In order to further explore the effects of particle size and substitution rate of waste rubber particles on the mechanical properties of cement mortar under static loading, three kinds of rubber particle sizes (0.100, 0.425 and 2.000 mm) were selected to replace natural sand with volume fraction of 0%, 5%, 10%, 15% and 20%, respectively. The compressive, flexural and splitting tensile strength tests were carried out, and the influence mechanism of rubber particle on the mechanical properties of cement mortar were studied by mercury intrusion porosimetry test, scanning electron microscopy analysis and energy dispersive spectroscopy analysis. The results show that the compressive, flexural and splitting tensile strength of rubber cement mortar decrease with the increase of rubber substitution rate, and the effect of particle size on the strength of mortar is not obvious. When the rubber substitution rate increases from 5% to 20%, the 28 d compressive strength of rubber cement mortar decreases by 27.2%~61.0%, the flexural strength decreases by 22.5%~31.7%, and the splitting tensile strength decreases by 30.0%~38.9%, respectively. The ratio of bending-compression ratio increases with the increase of substitution rate and particle size. The total porosity and average pore size of rubber mortar specimens are negatively correlated with compressive, flexural and splitting tensile strength.

Key words: rubber cement mortar, rubber particle size, rubber substitution rate, mechanical property, microstructure

中图分类号:

TU533

吴廷杰, 王春益, 杜向琴, 袁雪冰. 静力荷载下橡胶水泥砂浆力学性能及微观结构研究[J]. 硅酸盐通报, 2025, 44(4): 1438-1447.

WU Tingjie, WANG Chunyi, DU Xiangqin, YUAN Xuebing. Mechanical Properties and Microstructure of Rubber Cement Mortar under Static Loading[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(4): 1438-1447.

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