|Table of Contents|

Study on performance of gypsum based self-leveling mortar mixed with modified coal gangue powder(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2026年02期
Page:
66-73
Research Field:
建筑材料
Publishing date:

Info

Title:
Study on performance of gypsum based self-leveling mortar mixed with modified coal gangue powder
Author(s):
HOU Yongli1; 2;  CHEN Meng1;  YANG Tao3;  SONG Chengjie4
(1. School of Civil Engineering, Inner Mongolia University of Technology, Hohhot 010051, Inner Mongolia, China; 2. Key Laboratory of Civil Engineering Structure and Mechanics of Inner Mongolia Autonomous Region, Inner Mongolia University of Technology, Hohhot 010051, Inner Mongolia, China; 3. Guangdong Branch of the Second Construction Limited Company of China Construction Eighth Engineering Division, Shenzhen 518131, Guangdong, China)
Keywords:
desulfurization gypsum;  self leveling mortar;  modified coal gangue;  mechanical property;  water resistance
PACS:
TU526
DOI:
10.19815/j.jace.2024.09015
Abstract:
In response to the relatively poor water resistance and mechanical properties of desulfurization gypsum based self-leveling mortar(SLF-FGD)in practical engineering applications, desulfurization gypsum was used as the main cementitious material, and high-temperature modified coal gangue powder was used to replace cementitious materials in different proportions to prepare self leveling mortar. Through macroscopic performance testing, X-ray diffraction analysis, scanning electron microscopy, high-pressure mercury intrusion porosimetry and other microscopic testing methods, the influence of modified coal gangue powder on the macroscopic properties and microscopic characteristics of SLF-FGD was studied. The results show that adding an appropriate amount of coal gangue powder can improve the strength and water resistance of SLF-FGD. With the increase of coal gangue powder content, the water absorption rate of SLF-FGD gradually increases, while the 24 h flexural and compressive strength and 28 d dry flexural and compressive strength gradually decrease. Adding 5% coal gangue powder can reduce the water absorption rate of SLF-FGD and improve its strength. The pore structure of mortar can be optimized by adding proper amount of coal gangue powder and Ba(OH)2·8H2O to generate AFt crystal, C—S—H gel and BaSO4 crystal. When too much coal gangue powder and Ba(OH)2·8H2O are added, the excessive unreacted coal gangue powder particles and the large amount of barium sulfate crystals generated in the system can reduce the number of large pores, but the internal structure is loose and not compact, resulting in an increase in water absorption and a decrease in strength.

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Last Update: 2026-04-01