FENG Shuxia，LI Yanqi

(School of Architectural Engineering, Shandong Yingcai University, Jinan 250104, China)

Abstract: Three kinds of original low calcium fly ash from different regions were classified into several groups according to particle size. The bulk density, chemical constituent and pozzolanic activity of classified fly ash particle group were tested. Then the influencing factors of fly ash activity were analyzed by grey correlation analysis method. The results show that as the particle size decreases, the bulk density of fly ash increases while the Fe2O3 and SO3 mass contents decrease. When the particle size is less than 80 μm, the mass content of Al2O3 increases greatly. The pozzolanic activity of fly ash does not increase with the decrease of particle size. When fly ash particles are larger than 40 μm, chemical constituents have a greater influence on pozzolanic activity than particle size. When particles smaller than 40 μm, the pozzolanic activity of fly ash increase significantly due to the increasing content of glass phase in small fly ash particles.

Keywords: fly ash; size classification; chemical constituents; pozzolanic activity; grey correlation analysis

文章编号：1008-5548(2020)06-0051-07

DOI:10.13732/j.issn.1008-5548.2020.06.007

收稿日期： 2020-06-07， 修回日期：2020-07-11，在线出版时间：2020-09-10 13:19。

基金项目：国家自然科学基金项目，编号： 51702190； 山东省自然科学基金项目，编号： ZR2017LEM012； 山东省重点研发计划，编号：2017GGX20109。

第一作者简介：丰曙霞(1982—)，女，博士，教授，研究方向为固体废弃物在绿色建材中的综合利用。E-mail:fengshuxia1982@163.com。

中图分类号：TB321； TQ178                          文献标志码：A