TONG Yu, QI Chengcheng, AI Xiaoling, PAN Wenhao, DING Xiangqun
（School of Materials Science and Engineering， Shenyang Jianzhu University， Shenyang 110168, China）
Abstract: In order to explore the contribution of mechanochemical effect to the hydration activity of slag and enhance the activity index of slag, a process of mixed pulverization was carried out to realize the mechanochemical activation of slag-containing powder. The effects of the kind and content of the chemical aid, as well as the processing time, were investigated in details by testing the activity index and microstructural characteristics of slag products, which were subsequently used to analyze and discuss the working mechanism of mechanlchemical activation in the process of mixed pulverization. The results show that once Ca（OH）2 is employed as the chemical aid and the pulverizing time is fixed, the 28 d activity index of slag-containing powder is found to increase evidently with the increasing of Ca（OH）2 content up to 3%, and thus arrive a maximum activity index of 126%, but further increase of Ca（OH）2 content gives rise of a relative low value of the 28 d activity index. The maximum activity index is obtained with a Ca（OH）2 content of 3%, which is evidently superior to that of the reference sample. In the cases of a fixed Ca（OH）2 content of 3%, the activity index of slag-containing powder behaves a tendency of increasing with the continuous processing of mixed pulverization, although the increasing rate slow down gradually with the time. Microstructural characterization especially X-ray diffraction indicate the expenditure of Ca（OH）2 with the processing of the mixed pulverization. As a comparison, the employment of CaO as the chemical aid do not arrive an equivalent effect of mechanochemical activation in the process of mixed pulverization.
Keywords: mechanochemical effect; slag; calcium hydroxide; calcium oxide; mixed pulverization; activity index
中图分类号： TU375 文献标志码：A
收稿日期： 2022-04-05， 修回日期：2022-06-07，在线出版时间：2022-11-01。
基金项目：辽宁省自然科学基金项目，编号：20180550092；辽宁省教育厅面上项目，编号：LJKZ0591。
第一作者简介：佟钰（1972—），男，副教授，博士，研究方向为新型建筑材料的制备与应用。E-mail: tong_yu123@hotmail.com。
文章编号：1008-5548（2022）06-0031-06
DOI:10.13732/j.issn.1008-5548.2022.06.004
