改性废旧橡胶粉对水泥胶砂性能的影响  

Effect of Modified Rubber Powder on Performances of Cement Mortar

作　　者：季节 王颢翔 王琴 索智 苑志凯 JI Jie;WANG Haoxiang;WANG Qin;SUO Zhi;YUAN Zhikai(School of Civil and Transportation Engineering,Beijing University of Civil Engineering and Architecture,Beijing 100044,China;Beijing Advanced Innovation Center for Future Urban Design,Beijing 100044,China;Beijing Collaboratire Innovation Center for Energy Conservation&Emission Reduction and Sustainable Urban-Rural Development,Beijing 100044,China;Hebei Mobile Communication Co.,Ltd.,Shijiazhuang 050000,China)

机构地区：[1]北京建筑大学土木与交通工程学院,北京100044 [2]北京未来城市设计高精尖创新中心,北京100044 [3]北京节能减排与城乡可持续发展省部共建协同创新中心,北京100044 [4]中国移动通信集团河北有限公司,河北石家庄050000

出　　处：《建筑材料学报》2021年第4期679-686,共8页Journal of Building Materials

基　　金：国家自然科学基金资助项目(52078025,51778038);北京市自然基金委北京市教委联合资助项目(KZ201910016017);长江学者和创新团队发展计划资助项目(IRT-17R06);中国公路工程咨询集团有限公司开放性课题(YFZX-2019-06);市属高校基本科研业务费项目-ZC重大重点科研支撑专项-ZC05科研创新团队建设计划(X18259);北京建筑大学2021年度研究生创新项目支持。

摘　　要：为了探究改性废旧橡胶粉(简称改性胶粉)对水泥胶砂性能的影响及作用机理,利用四因素三水平正交试验研究了改性胶粉掺入顺序、粒径、掺量及改性方法对水泥胶砂性能的影响,通过极差分析确定了最佳条件组合;通过热重分析、扫描电子显微镜、压汞试验研究了改性胶粉水泥胶砂CH含量、界面过渡区形貌及孔隙的变化.结果表明:掺加改性胶粉可以降低水泥胶砂中CH的发育程度、界面过渡区的厚度以及凝胶孔体积,从而提升其干缩性能和韧性;掺加改性胶粉以后,水泥胶砂的水化进程减缓,大孔体积增大,力学性能降低;采用化学改性的301μm胶粉,以1%掺量按后掺入的顺序掺入水泥胶砂后,其综合性能最好.In order to explore the effect of modified rubber powder on performances of cement mortar and its mechanism,four factors i.e.mixing order,particle size,modified rubber powder content and modification method,and their three levels of orthogonal experiment were used.The performances of cement mortar in different conditions were test.The optimal combination of conditions was determined through range analysis.Thermogravimetric analysis,scanning electron microscope and mercury injection tests were used to measure the CH content,interfacial transition zone morphology and pore structure.The test results showed that adding modified rubber powder could reduce CH content,interface transition zone thickness and gel pore volume of cement mortar and improve its drying shrinkage and toughness.However,the adding modified rubber powder could slow down the hydration process and increase the macropore volume of cement mortar,which reduce its strength slightly.So,it was found that the performances of cement mortar with the 1%chemical modification of 301μm powder using after mixed order were the best.

关 键 词：改性胶粉 水泥胶砂 CH含量 界面过渡区形貌 孔隙结构 

分 类 号：TU528[建筑科学—建筑技术科学] U414.1[交通运输工程—道路与铁道工程]