Effects of mineral admixtures and lime on disintegration of alkali-activated slag exposed to 50 °c

Li, Zunrou, Pan, Zhu, Liu, Yang, He, Li, Duan, W, Collins, Frank and Sanjayan, Jay 2014, Effects of mineral admixtures and lime on disintegration of alkali-activated slag exposed to 50 °c, Construction and building materials, vol. 70, pp. 254-261, doi: 10.1016/j.conbuildmat.2014.07.101.

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Title Effects of mineral admixtures and lime on disintegration of alkali-activated slag exposed to 50 °c
Author(s) Li, Zunrou
Pan, Zhu
Liu, Yang
He, Li
Duan, W
Collins, FrankORCID iD for Collins, Frank orcid.org/0000-0001-6331-5390
Sanjayan, Jay
Journal name Construction and building materials
Volume number 70
Start page 254
End page 261
Total pages 8
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2014-11-15
ISSN 0950-0618
Keyword(s) alkali-activated slag
compressive strength
temperature exposure
Summary Alkali-activated slag can totally disintegrate when exposed to 50 C. This paper presents a study of possible solutions to avoid this disintegration by using silica fume (SF) and fly ash (FA) to partially replaceslag. It was found that partial replacement of slag with SF significantly reduces strength loss. A mixture of 50% slag 50% SF (cured at 25 and 60 C) showed no strength loss after the exposure. In comparison, a55% drop of strength was observed in a mixture of 50% slag 50% FA (cured at 25 C) after the same exposure.However, the strength loss of this mixture was reduced by 50% when cured at 60 C. The presence oflime in AAS pastes increases the degree of strength loss after the exposure. The mechanisms for the abovestrength results are discussed in terms of hydration products and microcracking.
Language eng
DOI 10.1016/j.conbuildmat.2014.07.101
Field of Research 090503 Construction Materials
0905 Civil Engineering
1202 Building
Socio Economic Objective 870301 Cement and Concrete Materials
HERDC Research category C1.1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2014, Elsevier
Persistent URL http://hdl.handle.net/10536/DRO/DU:30078498

Document type: Journal Article
Collection: Institute for Frontier Materials
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