Influence of Elevated Temperatures and Cooling Method on the Microstructure Development and Phase Evolution of Alkali-Activated Slag

Article


Fu, Hua, Mo, Rui, Wang, Penggang, Wang, Yanru, Cao, Yubin, Guang, Wentao and Ding, Yao. 2022. "Influence of Elevated Temperatures and Cooling Method on the Microstructure Development and Phase Evolution of Alkali-Activated Slag." Materials. 15 (6). https://doi.org/10.3390/ma15062022
Article Title

Influence of Elevated Temperatures and Cooling Method on the Microstructure Development and Phase Evolution of Alkali-Activated Slag

ERA Journal ID123663
Article CategoryArticle
AuthorsFu, Hua, Mo, Rui, Wang, Penggang, Wang, Yanru, Cao, Yubin, Guang, Wentao and Ding, Yao
Journal TitleMaterials
Journal Citation15 (6)
Article Number2022
Number of Pages22
Year2022
PublisherMDPI AG
Place of PublicationSwitzerland
ISSN1996-1944
Digital Object Identifier (DOI)https://doi.org/10.3390/ma15062022
Web Address (URL)https://www.mdpi.com/1996-1944/15/6/2022
Abstract

The performance of alkali-activated slag (AAS) under thermal treatment has received particular attention. In this study, the effect of five elevated temperatures (25, 200, 400, 600, and 800 °C) and two cooling methods (air cooling and water spraying) on the mechanical and durability properties, microstructure, and phase evolution of AAS was investigated. The results show that AAS mortars exhibit higher resistance to thermal attack than OPC in terms of strength and durability. AAS samples cooled in air show higher residual strength than those cooled by spraying water, which is mainly attributed to fewer cracks formed in the former. The resistance to carbonization of exposed AAS mortars depends on the pore size distribution, while that to chloride ion penetration depends on the porosity. Cooling methods show a minor effect on the phase evolution of reaction products, suggesting that the microstructure degradation is mainly responsible for the damage of AAS structures. This study provides fundamental knowledge for the thermally induced changes on AAS which contributes new ideas for the development of construction structures with higher fire resistance.

Keywordsphase evolution; alkali-activated slag; elevated temperature; cooling metho; durability
Byline AffiliationsQingdao University of Technology, China
Centre for Future Materials
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