EFFECTS OF LIGNOSULFONATE WITH DIFFERENT MOLECULAR WEIGHT ON THE WORKABILITY OF HIGH-VOLUME FLY ASH CEMENT MORTAR
Commercial lignosulfonate (LS) was fractionated into four fractions according to different molecular weight via ultrafilteration. Effects of molecular weight of LS fractions on the workability of highvolume fly ash cement mortar were studied. The adsorption on the cementitious surface, the effect on the Zeta potential of cement particle surface and the foaming capacity of the LS fractions were measured. Of the four fractions, LS3 with average molecular weight of 9479 offers high fluidity, low fluidity loss and good stability of the cement mortar due to its larger adsorptive amount on the cementitious particle surface, the higher zeta potential of the cementitious particle surface and the better foaming ability. In addition, lower fluidity loss of the cement mortar containing LS3 was related to the stronger retarding of LS3 on the mortar setting time. The experimental results suggested that for the purpose of better utilization of LS in the highvolume fly ash cement mortar in grouting, the average molecular weight of commercial LS should be properly increased.
lignosulfonate molecular weight cement mortar water reducer
Zheng Dafeng Qiu Xueqing Ouyang Xinping Yang Dongjie Lou Hongming
School of Chemical and Energy Engineering, South China University of Technology Guangzhou, 510640, China
国际会议
广州
英文
943-948
2006-11-08（万方平台首次上网日期，不代表论文的发表时间）