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

卷:

期数:

2026年02期

页码:

66-73

栏目:

建筑材料

出版日期:

2026-03-30

文章信息/Info

Title:

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

文章编号:

1673-2049(2026)02-0066-08

作者:

侯永利^1,2,陈猛¹,杨涛³,宋成杰⁴

(1. 内蒙古工业大学 土木工程学院,内蒙古 呼和浩特 010051; 2. 内蒙古工业大学 内蒙古自治区土木工程结构与力学重点实验室,内蒙古 呼和浩特 010051; 3. 中建八局第二建设有限公司广东分公司,广东 深圳 518131)

Author(s):

HOU Yongli^1,2, 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)

关键词:

脱硫石膏;  自流平砂浆;  改性煤矸石;  力学性能;  耐水性

Keywords:

desulfurization gypsum;  self leveling mortar;  modified coal gangue;  mechanical property;  water resistance

分类号:

TU526

DOI:

10.19815/j.jace.2024.09015

文献标志码:

A

摘要:

针对脱硫石膏基自流平砂浆(SLF-FGD)在实际工程应用中耐水性和力学性能相对较差的现状,以脱硫石膏为主要胶凝材料,将高温改性后的煤矸石粉按不同比例替代胶凝材料制备自流平砂浆,通过宏观性能测试和X射线衍射分析、扫描电子显微镜、高压压汞等微观测试方法,研究改性煤矸石粉对SLF-FGD宏观性能及微观特征的影响。结果表明:掺入适量煤矸石粉有助于改善SLF-FGD的强度和耐水性; 随着煤矸石粉掺量的增加,SLF-FGD的吸水率逐渐增大,24 h抗折、抗压强度以及28 d绝干抗折、抗压强度逐渐降低,掺5%煤矸石粉可以降低SLF-FGD的吸水率,提高SLF-FGD的强度; 掺入适量的煤矸石粉和Ba(OH)₂·8H₂O,生成的AFt晶体、C—S—H凝胶以及BaSO₄晶体可优化砂浆内部孔隙结构; 掺入过多煤矸石粉和Ba(OH)₂·8H₂O时,体系中会存在过多未反应的煤矸石粉颗粒以及生成的大量硫酸钡晶体,虽然可以减少大孔数量,但内部结构疏松不密实,导致吸水率提高、强度下降。

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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相似文献/References:

[1]侯永利,杨 涛.脱硫石膏强度及耐水性改善方法研究综述[J].建筑科学与工程学报,2024,41(04):95.[doi:10.19815/j.jace.2022.08079]
　HOU Yongli,YANG Tao.Review on improvement methods of desulfurization gypsum strength and water resistance[J].Journal of Architecture and Civil Engineering,2024,41(02):95.[doi:10.19815/j.jace.2022.08079]

备注/Memo

备注/Memo:

收稿日期:2024-09-08
基金项目:国家自然科学基金项目(52168031); 内蒙古自治区直属高校基本科研业务费项目(JY20230109)
作者简介:侯永利(1972-),男,工学博士,副教授,E-mail:houyongli@imut.edu.cn。
Author resume: HOU Yongli(1972-), male, PhD, associate professor, E-mail: houyongli@imut.edu.cn.

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更新日期/Last Update: 2026-04-01