LI Yao1，LIU Runqing¹，QI Wenhan¹，ZHANG Yahui²

(1.College of Materials Science and Engineering, Shenyang Ligong University, Shenyang 110159, China；2. College of Materials Science and Engineering, Shenyang Jianzhu University, Shenyang 110168, China)

Abstract: On the premise of not changing the mix ratio of concrete, silica fume with different particle size distribution prepared by grinding was mixed into concrete. The compressive strength, pore characteristics, pore size distribution and other microstructure changes of silica fume concrete were studied after curing at different ages at low temperature. The results show that under the conditions of -10 ℃ and 28 d curing age, the compressive strength of the concrete mixed with a specific surface area of 18.2 m2/g silica fume increases by 35.89%, the total porosity decreases by 3.1%, the proportion of much harmful and harmful holes decreases by 19.4% and 44.1% respectively, and the proportion of less harmful and harmless holes increases by 31.6% and 46.4% respectively. Therefore, optimizing the particle size distribution of silica fume can improve the compactness of concrete microstructure and improve the compressive strength of concrete under low temperature environment.

Keywords: silica fume; particle size distribution; concrete; microstructure; compressive strength

中图分类号：TU528                                文献标志码：A

文章编号：1008-5548(2019)06-0075-06

DOI:10.13732/j.issn.1008-5548.2019.06.013

收稿日期： 2019-04-15， 修回日期：2019-05-08，在线出版时间：2019-09-29 17:18。

基金项目：国家自然科学基金项目，编号：51472168；辽宁省自然科学基金指导计划项目，编号：20180550329；辽宁省创新人才计划项目，编号：LR2016060。

第一作者简介：李瑶(1983—)，女，博士，讲师，研究方向为低温混凝土，E-mail:49728418@qq.com。

通信作者简介：刘润清(1980—)，女，教授，硕士生导师，研究方向为水泥基复合材料，E-mail:13940195514@163.com。