Influences of High-Sulphur Fly Ash on the Properties of Lightweight Cement-Treated Materials Subjected to Sulphate Corrosion

被引：2

作者：

Wang, Xiaoyuan ^{[1
]}

Han, Pengju ^{[1
]}

Dong, Xiaoqiang ^{[1
]}

Li, Xiangyu ^{[1
]}

Bai, Xiaohong ^{[1
]}

He, Bin ^{[1
,2
]}

Niu, Shiwei ^{[1
]}

Sun, Funan ^{[1
]}

机构：

[1] Taiyuan Univ Technol, Coll Civil Engn, West Yingze St 79, Taiyuan 030024, Peoples R China

[2] Tongji Univ, Key Lab Geotech & Underground Engn, Minist Educ, Shanghai 200092, Peoples R China

来源：

APPLIED SCIENCES-BASEL | 2020年 / 10卷 / 15期

基金：

中国国家自然科学基金;

关键词：

lightweight cement-treated materials; high-sulphur fly ash; sulphate corrosion; unconfined compressive strength; X-ray diffraction; electrochemical impedance spectroscopy; scanning electron microscopy; FOAMED CONCRETE; VOLCANIC ASH; ENGINEERING PROPERTIES; PERFORMANCE EVALUATION; POZZOLANIC REACTION; BLENDED CEMENT; HYDRATION; STRENGTH; SUBGRADE; BEHAVIOR;

D O I：

10.3390/app10155217

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

In this study, the effects of high-sulphur fly ash on the properties of lightweight cement-treated materials (LCMs) immersed in sodium sulphate solutions were studied. The unconfined compressive strength of LCMs corroded by sulphate was tested. The microscopic properties were characterised by X-ray diffraction (XRD), electrochemical impedance spectroscopy (EIS), and scanning electron microscopy (SEM). The results show that high-sulphur fly ash has an adverse effect on the structural strength of LCMs after corrosion, but when the content of fly ash is less than 75%, the effect of fly ash on the strength is small. A small amount of high-sulphur fly ash can improve the density of the material structure; the internal pore structure of LCMs provides space for the growth of ettringite and other corrosive substances and relieves the expansion pressure. LCMs mixed with high-sulphur fly ash have a certain resistance to sodium sulphate corrosion.

引用

页数：16

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