关键词: 水化热;净浆流动度;凝结时间;抗压强度

Abstract: The application of the polycarboxylate superplasticizer was limited by its low early strength.In order to improve the early strength of concrete,initiated by redox system,OX-M4000 and acrylic acid were used as the main materials to synthesize a polycarboxylate superplasticizer with early-age strength by radical polymerization.The performance of the polycarboxylate superplasticizer with early-age strength by the ways of XRD,SEM and hydration heat,etc was studied.The results show that: the polycarboxylate superplasticizer has conspicuous effect on the early strength of the concrete: the strength of 1 d increased by 17％,the strength of 3 d increased by 14％and the strength of 7 d increased by 25％.It has a good application in the production of segment,pre-cast concrete and pile with high early-age strength,which can improve the turnover rate of molds and place effectively,increase economic benefits and has a broad market prospect.

Key words: hydration heat;fluidity of cement paste;setting time;compressive strength