PENG Shangshi1，2 ， ZHOU Shihua1，2 ， YANG Huaquan1，2 ， SU Jie1
（1. Changjiang River Scientific Research Institute, Wuhan 430010, China; 2. Collaborative Innovation Center for Geo-Hazards and Eco-Environment in Three Gorges Area, Yichang 443000, China）
Abstract： The influence of different preparing processes on hydration characteristics of magnesia expansion agent was analyzed from the aspects of calcining temperature, sintering time, and grinding fineness. The results show that the hydration activity of magnesia gradually decreases with the increasing of calcining temperature, extending of sintering time and increasing of particle size. When the calcining temperature exceeds over 1 100 ℃, the hydration activity decreases sharply. The magnesia with higher calcining temperature and larger particle size has greater expansion energy. The hydration reaction time is longer, the later expansion continues, and the final expansion amount is larger.
Keywords: magnesia; expansion agent; hydration; mass concrete
中图分类号：TU528 文献标志码：A
文章编号：1008-5548（2014）05-0067-04
DOI:10.13732/j.issn.1008-5548.2014.05.017
收稿日期：2014-01-02， 修回日期：2014-01-15，在线出版时间：2014-10-11。
基金项目：国家自然科学基金项目，编号：51279017，51109122；国家“十二五”科技支撑计划项目，编号：2011BAE27B01。
第一作者简介：彭尚仕（1969－），男，高级工程师，研究方向为水工材料。电话：027-82926347，E-mail: pengss@mail.crsri.cn。
通信作者简介：周世华（1979－），男，高级工程师，研究方向为水工材料。E-mail: 937210661@qq.com。
