WU Lianjie^1,2, YE Chuxiong¹, OUYANG Gaoshang^1,2, WANG Jinsong^1，2, YI Mingming¹

(1. College of Civil Engineering, University of South China, Hengyang 421000, China;2. Yangtze River Delta (Zhuji) Research Institute, University of South China, Shaoxing 312000, China)

Abstract: In this paper, metakaolin with different particle size distribution was prepared by mixing two kinds of raw materials with different mass ratios, then the metakaolin base polymer was prepared.Rheological and fluidity testing methods, combined with setting time test and mechanical property test, were used to study the influence of raw material particle size on the working properties and mechanical strength of alkali-excited metakaolin base polymer.Finally, morphology analysis, isothermal adsorption and Fourier transform infrared spectroscopy (FTIR) were used to characterize the cross-section morphology, pore structure and reaction degree of the geopolymer.The results show that the increase of metakaolin particle size can significantly improve the flow performance of the geopolymer slurry, but also significantly prolong the setting time of the slurry.With the increase of raw material particle size, the mechanical strength of geopolymer solidified body decreases monotonically for 1 d.The mechanical strength of the solidified body at 3 and 7 days did not show obvious change rule.

Keywords: particle size； geopolymers； fluidity； mechanical properties

中图分类号： TU502

文献标志码：A

文章编号：1008-5548(2021)06-0075-10

DOI:10.13732/j.issn.1008-5548.2021.06.009

收稿日期： 2021-03-25，修回日期：2021-06-09，在线出版时间：2021-10-18 17:10。

基金项目：湖南省研究生科研创新项目，编号：CX20200939。

第一作者简介：吴廉洁(1996—)，男，硕士研究生，研究方向为新型绿色胶凝材料。E-mail: 1714915877@qq.com。

通信作者简介：王劲松(1972—)，博士，教授，博士生导师，研究方向为环境功能材料。E-mail: xhwjs@163.com。