HYDRATION OF ULTRAFINE AND ORDINARY PORTLAND CEMENT AT EARLY AGES

摘要：

　　Experimental results of a quantitative of the hydration of ultrafine and ordinary Portland cement pastes were presented in this paper.The degree of hydration of cement pastes was determined based on the determination of non-evaporable content.The purpose of this study was to explore the mechanism of the effects of particle size distribution on hydration kinetics of cement.The data obtained from test indicates that at each age before 7 days,the non-evaporable water content of the ultrafine cement paste was higher than that of the ordinary cement paste.The fineness has a great effect on early 7 days hydration; however,the view that increased fineness improves hydration at later ages is not correct.In the later age,the rate of hydration slows down and diffusion of silicate ions through a lays of existing products becomes the rate-limiting process.The porosity of ultrafine cement paste is lower than of ordinary cement paste.The difference in porosity of two cement paste is most pronounced at early ages before 14 days.A general reduction in porosity with increasing in age is observed from test results.The ultrafine cement consistently produces higher gel/space ratios at all seven testing ages.At an age of 1 day,the ordinary Portland cement achieves 79% of its fine counterpart.

关键词： Ultrafine cement cement paste non-evaporable water degree of hydration porosity gel/space ratio

作者: Jikai Zhou Yuanyuan Yan Xudong Chen Minquan Zhou Xiuming Jiao

作者单位: College of Civil and Transportation Engineering, Hohai University, Nanjing, Jiangsu, 210098, P.R.Chi Tianhuangping Pumped Storage Power Co.Ltd., Anji 313302, P.R.China

会议类型: 国际会议

会议名称: The Twelfth International Symposium on Structural Engineering (第十二届结构工程国际研讨会)

会议地点: 武汉

会议语种:英文

页码: 310-315

在线出版日期: 2012-11-17（万方平台首次上网日期，不代表论文的发表时间）