Engineering and micro-properties of alkali-activated slag pastes with Bayer red mud

被引：26
|
作者：
Tian, Kaige [1 ,2 ]
Wang, Yanshuai [2 ]
Dong, Biqin [2 ]
Fang, Guohao [3 ]
Xing, Feng [1 ,2 ]
机构：
[1] China Earthquake Adm, Inst Engn Mech, Key Lab Earthquake Engn & Engn Vibrat, Harbin 150080, Peoples R China
[2] Shenzhen Univ, Coll Civil & Transportat Engn, Shenzhen 518060, Peoples R China
[3] Shenzhen Univ, Inst Adv Study, Shenzhen 518060, Peoples R China
来源：
CONSTRUCTION AND BUILDING MATERIALS | 2022年 / 351卷
基金：
中国国家自然科学基金;
关键词：
Red mud; Alkali -activated materials; Delayed gel coagulation; Hydration promotion; FLY-ASH; HYDRATION PRODUCTS; CEMENT PRODUCTION; STRENGTH; MICROSTRUCTURE; GEOPOLYMER; EFFLORESCENCE; CARBONATION; PHOSPHATE; RECOVERY;
D O I：
10.1016/j.conbuildmat.2022.128869
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
In this study, we produced alkali-activated slag/red mud (AASR) pastes using sodium silicate as the alkali activator. The effects of Bayer red mud (RM) on the engineering and micro-properties of alkali-activated slag pastes were investigated. It was found that the decreased fluidity and the increased setting time of the fresh AASR pastes were achieved through the delayed gel coagulation of RM. The maximum compressive strength of the hardened AASR paste arrived at 89.93 MPa with an optimal proportion (i.e., R40S60). Furthermore, the increases in hydration heat peaks of AASR pastes were observed in some mixes (e.g., R20S80 and R40S60), which verified the appropriate amounts of RM enabled promoting the alkali-activated reaction of slag. Besides, the polymeri-zation and hydration products (C-(N)-A-S-H gels and ettringite) of AASR pastes were elaborated through spec-troscopic and micro-morphologic analyses.
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页数：12
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