硅粉/橡胶混凝土的力学性能及细观模拟

硅酸盐通报 ›› 2025, Vol. 44 ›› Issue (3): 1032-1040.

硅粉/橡胶混凝土的力学性能及细观模拟

杨刚¹, 葛浪潮¹, 谢森辉², 冯小俊¹, 宋子龙¹, 何炯辉³, 李庚英³

1.中交路桥建设有限公司,北京 101100;
2.广东慧图资环科技发展有限公司,广州 510510;
3.华南农业大学水利与土木工程学院,广州 510642

收稿日期:2024-10-11 修订日期:2024-12-12 出版日期:2025-03-15 发布日期:2025-04-01
通信作者: 李庚英,博士,教授。E-mail:ligengying@scau.edu.cn
作者简介:杨刚(1980—),男,高级工程师。主要从事道路材料及结构的研究及应用。E-mail:371681108@qq.com
基金资助:
国家自然科学基金(52178209,51878299);广东省普通高校重点领域专项及创新团队项目(2023KCXTD005,2019KZDZX2001)

Mechanical Properties and Mesoscopic Simulation of Silica Fume/Rubber Concrete

YANG Gang¹, GE Langchao¹, XIE Senhui², FENG Xiaojun¹, SONG Zilong¹, HE Jionghui³, LI Gengying³

1. Road & Bridge International Co., Ltd., Beijing 101100, China;
2. Guangdong Huitu Resources and Environmental Technology Development Co., Ltd., Guangzhou 510510, China;
3. College of Water Conservancy and Civil Engineering, South China Agricultural University, Guangzhou 510642, China

Received:2024-10-11 Revised:2024-12-12 Published:2025-03-15 Online:2025-04-01

摘要/Abstract

摘要： 为了提高废弃橡胶的用量并获得符合设计要求的混凝土,本文研究了硅粉掺量和废弃橡胶掺量对混凝土28 d抗压强度、抗折强度和劈裂抗拉强度的影响,并采用扫描电子显微镜观察混凝土的微观形貌,利用ABAQUS有限元软件对混凝土的受压破坏过程进行细观模拟。结果表明:废弃橡胶掺量越高,混凝土的力学性能越低;硅粉可以改善橡胶混凝土的力学性能,最优用量为7%(质量分数);复掺7%硅粉和15%(体积分数)橡胶的混凝土力学性能与基准混凝土相当,其28 d抗压强度、抗折强度和劈裂抗拉强度分别为50.3、3.56和2.64 MPa,分别比单掺15%橡胶的混凝土提高了24.2%、13.4%和10.0%,满足C40混凝土的设计要求。橡胶-水泥砂浆界面存在缺陷,橡胶掺量越多则微观缺陷越多。掺入橡胶后,微细裂缝由粗骨料界面向橡胶颗粒界面迁移,且橡胶掺量越高,橡胶颗粒界面的微细裂缝越多;硅粉减少了橡胶颗粒界面的裂缝,提高了混凝土的强度。

关键词: 橡胶混凝土, 硅粉, 力学性能, 微观结构, 细观模拟

Abstract: In order to increase the replacing amount of waste rubber within concrete and to ensure its mechanical strength meet the designed standard, the paper investigated the effects of silica fume content and waste rubber content on the 28 d compressive strength, flexural strength and splitting tensile strength of concrete. The morphology of concrete was explained by using scanning electron microscopy (SEM), and the failure process was simulated by using ABAQUS finite element software at the microscopic level. The results show that the adding of waste rubber reduces the mechanical properties of concrete. The higher the waste rubber content is, the lower the mechanical properties is. Silica fume can improve the mechanical properties of rubber concrete, and the optimal content is 7% (mass fraction). The mechanical properties of concrete hybrid incorporating of 7% silica fume and 15% (volume fraction) rubber are consistent with the control one, and 28 d compressive strength, flexural strength and splitting tensile strength are 50.3, 3.56, and 2.64 MPa, respectively, meeting the designed requirements of C40 concrete, which are 24.2%, 13.4%, and 10.0% than those of concrete single doped with 15% rubber concrete. There are a lot of defects on the interface between rubber and cement mortar, and the higher the waste rubber is, the more the microscopic defects is. The adding of waste rubber leads to the micro-cracks transfer from the coarse aggregates interface to rubber particles, and the higher the rubber content is, the more the micro-cracks is. The incorporating of silica fume is effective in reducing the rubber particle interface cracks, and improve concrete strength.

Key words: rubber concrete, silica fume, mechanical property, microstructure, mesoscopic simulation

中图分类号:

TU528

杨刚, 葛浪潮, 谢森辉, 冯小俊, 宋子龙, 何炯辉, 李庚英. 硅粉/橡胶混凝土的力学性能及细观模拟[J]. 硅酸盐通报, 2025, 44(3): 1032-1040.

YANG Gang, GE Langchao, XIE Senhui, FENG Xiaojun, SONG Zilong, HE Jionghui, LI Gengying. Mechanical Properties and Mesoscopic Simulation of Silica Fume/Rubber Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(3): 1032-1040.

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