Study on properties and structure of lightweight concrete prepared with high-volume coal-fired solid waste
WEI Kaibo
FAN Haihong
MA Chunling
LI Buya
HE Yujie
Abstract：Slag was used as the main aggregate,fly ash and desulfurization gypsum were used as cementitious materials to re-place part of the cement to study the effects of single addition of fly ash and combined addition of fly ash and gypsum on the me-chanical properties and microstructure of lightweight concrete,and investigate its reaction mechanism through microscopic analysis such as scanning electron microscopy(SEM)and X-ray energy spectroscopy(EDS).The results show that when the slag content in the con-crete is 70%and the single fly ash content is 10%,the 28 d compressive strength reaches 27.12 MPa,and the dry apparent density is 1758.31 kg/m3.When double doped fly ash of 10%and desulfurization gypsum of 30%,the 28 d compressive strength of lightweight concrete reaches 20.81 MPa,and the dry apparent density reaches 1703.51 kg/m3.The incorporation of fly ash and desulfurization gyp-sum with appropriate ratio changed the growth orientation of Ca(OH)2,which make the hydration products more uniform and dense.
Keywords：high-volume solid wastelightweight concretemicrostructurereaction mechanism
Publication Date：2026-01-25
Online Publishing Date：2026-03-17(First online date of this platform, not the publication date of the document)
Pages：8( 27-33,47 )