Influence of Superplasticizer Type and Dosage on Early-age Drying Shrinkage of Cement Paste with Consideration of Pore Size Distribution and Water Loss  

作　　者：QIAN Xiaoqian YU Congdi ZHANG Lifeng QIAN Kuangliang FANG Minghui LAI Junying 钱晓倩;YU Congdi;ZHANG Lifeng;QIAN Kuangliang;FANG Minghui;LAI Junying(College of Civil Engineering and Architecture,Zhejiang University,Hangzhou 310058,China)

机构地区：[1]College of Civil Engineering and Architecture,Zhejiang University,Hangzhou 310058,China

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2020年第4期758-767,共10页武汉理工大学学报（材料科学英文版）

基　　金：Funded by the Key Research and Development Program of Zhejiang Province in 2018(No2018C03033-1)。

摘　　要：We introduced a parameter r_s(the radius of the pores where the meniscus forms),which is composed of two factors,i e,water loss and cumulative pore size distribution(PSD),to provide a better explanation of the influence of superplasticizers(SPs)on early-age drying shrinkage.In our experiments,it is found that the addition of three types of SPs leads to a significant increase in the early-age drying shrinkage of cement paste,and drying shrinkage increases with the dosage of SPs.Based on the results above,we further studied the mechanism of the effects of SPs on the early-age drying shrinkage of cement paste by PSD and water loss,which are two components of r_s.The experimental results indicate that r_s can be a better index for the early-age drying shrinkage of cement-based materials with SPs than a single factor.In addition,the effects of SPs on other factors such as hydration degree and elastic modulus were also investigated and discussed.

关 键 词：SUPERPLASTICIZER early-age drying shrinkage water loss pore size distribution 

分 类 号：TU528[建筑科学—建筑技术科学]