硅粉/橡胶混凝土的力学性能及细观模拟  

Mechanical Properties and Mesoscopic Simulation of Silica Fume/Rubber Concrete

作　　者：杨刚 葛浪潮 谢森辉 冯小俊 宋子龙 何炯辉 李庚英 YANG Gang;GE Langchao;XIE Senhui;FENG Xiaojun;SONG Zilong;HE Jionghui;LI Gengying(Road&Bridge International Co.,Ltd.,Beijing 101100,China;Guangdong Huitu Resources and Environmental Technology Development Co.,Ltd.,Guangzhou 510510,China;College of Water Conservancy and Civil Engineering,South China Agricultural University,Guangzhou 510642,China)

机构地区：[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

出　　处：《硅酸盐通报》2025年第3期1032-1040,共9页Bulletin of the Chinese Ceramic Society

基　　金：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)。

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。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.

关 键 词：橡胶混凝土 硅粉 力学性能 微观结构 细观模拟 

分 类 号：TU528[建筑科学—建筑技术科学]