YING Zhigang1，LEI Yiming2，QIAO Lin1，LI Jinkai2，LIU Zongming2
(1. Shandong Chuangwei External Wall Thermal Insulation Material Co., Ltd., Jinan 250013, China;2. College of Materials Science and Engineering, University of Jinan, Jinan 250022, China)
Abstract: In order to study the effects of fly ash content, aluminum powder content, sodium hydroxide content, water material ratio (the proportion of water quality to quality sum of cement and fly ash), water temperature and other factors on the compressive strength and bulk density of autoclaved fly ash aerated concrete, L16 (45) orthogonal design experiment was adopted. The results show that the content of aluminum powder is the primary factor affecting the compressive strength and bulk density of the non-autoclaved fly ash aerated concrete, and the increase of the content of fly ash between 40% and 55% does not significantly reduce the compressive strength. Water temperature and water-material ratio are not the secondary factors of bulk density and compressive strength of aerated concrete. According to range analysis and comprehensive equilibrium analysis, the optimal experimental ratio of this orthogonal experiment is A2B3C4D1E2, the compressive strength and bulk density are 1.2 MPa and 672.16 kg/m3 respectively. Using automatic mercury porosimeter to test the pore size distribution, it is found that scheme 1 with the greatest strength has the best pore size distribution. Using scanning electron microscope (SEM), spherical fly ash particles embedded in the fracture surface of aerated concrete were observed.
Keywords: orthogonal analysis； fly ash aerated concrete； compressive strength; density
中图分类号：TU528
文献标志码：A
文章编号：1008-5548(2021)06-0105-07
DOI:10.13732/j.issn.1008-5548.2021.06.013
收稿日期： 2021-07-03，修回日期：2021-10-02，在线出版时间：2021-10-25 16:59。
基金项目：国家重点研发计划基金项目，编号：2017YFE0120900。
第一作者简介：英志刚(1980—)，男，研究方向为新型保温材料。E-mail: 122404565@qq.com。
