Microstructure and Mechanical Property of SBR Latez Modified Cement Mortar
SEM image, Les density bottle methods, mercury intrusion method, capillary water adsorption under the same temperature and humidity are adopted in this paper, and the microstructure characteristic of cement mortar modified by different content of SBR latex are intensive studied, and the flexure strength of mortars aged at 3d, 28d, 90d are tested respectively. The content of SBR latex is 0, 3％, 6％, 9％, 12％, 18％ by weight of cement and water cement ratio is 0.43. The results show that microstructure of SBR latex modified cement mortar present the following characteristic with the increasing content of SBR latex: 1) opening porosity being reduced and closing porosity being increased visibly; 2) characteristic pore diameter of mortar being reduced and quality of pore whose size is less than 20mm being increased obviously, harmful pore(the range of pore size is from 50 to 200mm) and excessive harmful porosity (the pore size is above 200 mm) being decreased markedly; 3) At the age of 24h, capillary water absorption being reduced form 10％ for common mortar to 2.1％ for SBR latex modified mortar with the content of SBR latex. Flexure strength of SBR latex midfield cement mortar is decreased slightly at the age of 3d and that in 28d age has few changes, but that in 90d age can be increased greatly. By the way of analyses the relationship between flexure strength at the age of 90d and microstructure, it can be concluded that the smaller of characteristic pore diameter, the less harmful pore and excessive harmful pore and as the increasing proportion of closing porosity in total porosity, the better the mechanical property of mortar.
SBR latez cement mortar porosity capillary water absorption flezure strength
Yingjun Mei Zhiyong Li Naixing Liang Peiming Wang
School of Civil Engineering &Architecture Chongqin Jiao-tong University, Chongqin 400074, China Key Laboratory of Advanced Civil Engineering Materials (Tongji University), Ministry of Education Sh
国际会议
6th Asian Symposium on Polymers in Concrete(第六届亚洲聚合物混凝土国际会议)
上海
英文
265-272
2009-10-29（万方平台首次上网日期，不代表论文的发表时间）