Abstract: The compressive strength ratio (activity indexes) of mortar specimens in 7, 14, 21, 28, 35, 120 d were studied which were prepared by three kinds of waste glass powders with median diameter of 15.63, 14.93, 9.54 μm substituting 10%, 20% and 30% cements with the same mass fraction. The pH values of waste glass powders lime solution and fly ash lime solution in different ages were determined. The results show that the higher the replace rate is, the lower the activity index is. In the early stage of before 35 d, waste glass powders groups with the diameter of 15.63, 14.93 μm have the high activity index. During the latter stage of 35~120 d, 9.54 μm group was the most active. In the early stage, the activity index of waste glass powders group decreases with the extension of the age， and increases during the latter stage. In 120 d, more than 90% can be reached which is about 15% lower than the activity index of fly ash group. The pH values of waste glass powders and fly ash lime solution decrease in the early stage, and increase during the latter stage. The waste glass powders and fly ash lime solution generate a large number of CaO-SiO₂ -H₂O, and ettringite is generated in fly ash lime solution, which shows that waste glass powders have very strong pozzolanic activity during the latter stage.

Keywords: waste glass powder; pozzolanic activity; mortar specimen; compressive strength ratio

中图分类号：TU528.31           文献标志码：A

文章编号：1008-5548（2014）04-0074-06

DOI:10.13732/j.issn.1008-5548.2014.04.017

收稿日期：2013-11-02， 修回日期：2013-11-11，在线出版时间：2014-08-28。

基金项目：国家自然科学基金重点项目，编号：51378247。

第一作者简介：李卓才（1984—），男，硕士研究生，研究方向为结构设计理论及高性能混凝土应用。 E-mail:619093479@qq.com。

通信作者简介：柯国军（1964—），男，硕士，教授，研究方向为高性能混凝土应用。 E-mail:kegj320@sina.com。