不同岩性石粉对混凝土性能的影响研究  

Study of the effects of clay modifier on the properties of different mud concrete

作　　者：李崇智[1] 张方财 刘雷霆 马健 葛挺林 

机构地区：[1]北京建筑大学土木与交通工程学院,北京100044 [2]北京君盛混凝土制品有限公司,北京100012 [3]和创新天(北京)环保科技有限公司,北京100015

出　　处：《混凝土》2015年第12期56-59,共4页Concrete

基　　金：北京自然科学基金资助项目(2112012);北京教育委员会基金资助项目(KM201210016009);北京市属高校创新团队建设与教师职业发展计划项目(IDHT20130512)

摘　　要：选取岩性不同的石灰石粉和砂岩石粉,按照1∶1的比例组合成复合粉体,用该粉体以不同比例替代水泥用于配制水泥砂浆和混凝土,通过掺入自制的高性能聚羧酸系减水剂PCE和黏土改性剂SMA,可以很好的改善因为复合石粉的掺入导致的混凝土相容性问题。结果表明,复合石粉掺量达到10%对混凝土的工作性具有很大影响,加入5%的黏土改性剂SMA,对粉体含量低于15%的水泥净浆的流动度和经时损失都达到要求;混凝土工作性良好,各龄期强度最高,并通过对不同岩性的石粉形貌进行分析,初步探索石粉对混凝土影响机理。Selecting limestone powder and sandstone powder of different lithology, according to the ratio of 1 ： 1 to combine them into a composite powder,use the powder in the preparation of cement mortar and concrete with different proportion of replacement of cement, through adding the high performance polycarboxylate superplasticizer PCE and clay modifier SMA, the compatibility problems caused by composite powder incorporation can be well improved.The results show that it has a great influence on the concrete work when the content of composite powder reached 10%of cement, adding 5%clay modifier SMA, the initial fluidity and the loss of fluidity of the ce- ment paste with the powder content lower than 15%of cement can reach requirements. Concrete workability is good, the strength of vari- ous age is the highest. And based on the powder morphology of different lithological analysis, a preliminary exploration of the mecha- nism of the influence of powder on concrete.

关 键 词：聚羧酸减水剂 相容性 黏土改性剂 

分 类 号：TU528.041[建筑科学—建筑技术科学]