Mechanism Study and Application of the Modifier for Siliceous Machine-made Sand
ZHANG Guangtian1,2, LIU Juanhong1, SUI Baolong3, CHEN Zhaoyang2
1 College of Civil and Resources Engineering, University of Science and Technology Beijing, Beijing 100083; 2 Hebei Academy of Building Research,Shijiazhuang 050227; 3 Hebei Institute of Technology Co., Ltd.,Shijiazhuang 050227
Abstract: Because of the high content of stone powder and the ability of stone powder to absorb water reducing agent, the workability of concrete prepared by siliceous machine-made sand is poor. A small molecule surfactant, referred to as modifier, was prepared to improve the occurrence of siliceous sand. Firstly, the composition, morphology and characteristics of machine-made sand powder were analyzed. Then, the expansion degree of mortar of different stone powder with and without the addition of modifier was compared and applied in two kinds of siliceous machine-made sand concrete. Finally, the mechanism of modifier was analyzed by means of particle size analysis, micrograph, SEM and Zeta potential. Experimental results show that the modified agent of siliceous mechanism sand can effectively increase the degree of expansion of concrete mortar which improve the initial slump effectively and reduce slump loss of concrete. And it has little influence on the strength. The modified agent is mainly used to improve the workability of the siliceous mechanism sand concrete by complexation with strong dispersion and adsorption,and reduce the negative influence.
张广田,刘娟红,隋宝龙,陈朝阳. 硅质机制砂改性剂的机理研究与应用[J]. 《材料导报》期刊社, 2017, 31(24): 56-62.
ZHANG Guangtian, LIU Juanhong, SUI Baolong, CHEN Zhaoyang. Mechanism Study and Application of the Modifier for Siliceous Machine-made Sand. Materials Reports, 2017, 31(24): 56-62.
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2017, Vol. 31 
