Effects of Si/Al ratio on the efflorescence and properties of fly ash based geopolymer

被引：271

作者：

Wang, Yaguang ^{[2
]}

Liu, Xiaoming ^{[1
,2
]}

Zhang, Wei ^{[2
]}

Li, Zepeng ^{[2
]}

Zhang, Yuliang ^{[2
]}

Li, Yong ^{[2
]}

Ren, Yongyu ^{[2
]}

机构：

[1] Univ Sci & Technol Beijing, State Key Lab Adv Met, Beijing 100083, Peoples R China

[2] Univ Sci & Technol Beijing, Sch Met & Ecol Engn, Beijing 100083, Peoples R China

来源：

JOURNAL OF CLEANER PRODUCTION | 2020年 / 244卷

基金：

中国国家自然科学基金;

关键词：

Efflorescence; Microstructures; Geopolymer; Si/al ratio; ALKALI-ACTIVATED SLAG; LONG-TERM PERFORMANCE; RED MUD; MICROSTRUCTURE; CEMENT;

D O I：

10.1016/j.jclepro.2019.118852

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Efflorescence seriously affects the practical application of geopolymer. In this study, fly ash based geopolymer was prepared by raw materials containing different Si/Al ratios. A test method of the efflorescence degree of geopolymer was proposed and applied. The effects of the Si/Al ratio on products, microstructure, pore structures, compressive strength, water loss rate and efflorescence of geopolymer were systematically investigated. The reaction products and structures of geopolymer were tested by XRD, FTIR, TG-DTA, SEM-EDS and BET. The results showed that the efflorescence degree of different samples can be compared by the test method simply, effectively and quantitatively. The products of geopolymer were mainly amorphous gels N(C)-A-S-H containing large amounts of Si and Al components. The structures, properties and efflorescence degree of the geopolymer were different due to the different Si/Al ratio. When the Si/Al ratio of geopolymer was 1.5, the content of [AlO4](-) structures was highest, while the volume and size of pore were relatively small. The dense matrix and [AlO4](-) structures of geopolymer can reduce the efflorescence degree significantly. This study can provide a reference for future investigation about efflorescence inhibition and efflorescence test methods of geopolymer. (C) 2019 Elsevier Ltd. All rights reserved.

引用

页数：12

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