Improving drying shrinkage and strength development of alkali-activated high-calcium fly ash using commercial-grade calcium sulfate as expansive additive

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Published: Aug 23, 2021
Keywords:
Alkali-activated high-calcium fly ash Commercial-grade calcium sulfate Strength development Shrinkage compensation

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Chudapak Detphan
Sustainable Construction Material Technology Research Unit, Department of Civil Engineering, Faculty of Engineering and Architecture, Rajamangala University of Technology Isan, Nakhon Ratchasima 30000, Thailand
Patthamawadee Kaeorawang
Sustainable Construction Material Technology Research Unit, Department of Civil Engineering, Faculty of Engineering and Architecture, Rajamangala University of Technology Isan, Nakhon Ratchasima 30000, Thailand
Borwonrak Injorhor
Sustainable Construction Material Technology Research Unit, Department of Civil Engineering, Faculty of Engineering and Architecture, Rajamangala University of Technology Isan, Nakhon Ratchasima 30000, Thailand
Khattiya Chompoovong
Sustainable Construction Material Technology Research Unit, Department of Civil Engineering, Faculty of Engineering and Architecture, Rajamangala University of Technology Isan, Nakhon Ratchasima 30000, Thailand
Sakonwan Hanjitsuwan
Program of Civil Technology, Faculty of Industrial Technology, Lampang Rajabhat University, Lampang 52100, Thailand
Tanakorn Phoo-ngernkham
Sustainable Construction Material Technology Research Unit, Department of Civil Engineering, Faculty of Engineering and Architecture, Rajamangala University of Technology Isan, Nakhon Ratchasima 30000, Thailand
Prinya Chindaprasirt
Sustainable Infrastructure Research and Development Center, Department of Civil Engineering, Faculty of Engineering, Khon Kaen University, Khon Kaen 40002, Thailand

Abstract

The effect of using commercial-grade calcium sulfate (CS) in alkali-activated high-calcium fly ash (AAHFA) paste on the drying shrinkage and strength is reported. Five different fly ash (FA): CS ratios of 100:0, 97.5:2.5, 95:5, 92.5:7.5, and 90:10 were investigated. A constant Na2SiO3:10 M NaOH ratio of 1.0, liquid alkaline activator/binder (L/B) ratio of 0.40, and ambient curing temperature (~25 °C) were used for all mixes. The results clearly showed a reduction in the setting time for the AAHFA incorporating CS. The compressive strength of the AAHFA paste increased with increasing CS content up to an optimum level. In addition, the use of a mixture of FA and CS to produce AAHFA could improve its drying shrinkage. The use of 2.5% CS or 5% CS is recommended to realize significant improvements in both the drying shrinkage and strength development of AAHFA paste.

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How to Cite
Detphan, C. ., Kaeorawang, P. ., Injorhor, B. ., Chompoovong, K. ., Hanjitsuwan, S. ., Phoo-ngernkham, T. ., & Chindaprasirt, P. . (2021). Improving drying shrinkage and strength development of alkali-activated high-calcium fly ash using commercial-grade calcium sulfate as expansive additive. Engineering and Applied Science Research, 49(1), 58–64. Retrieved from https://ph01.tci-thaijo.org/index.php/easr/article/view/245209
Issue
Vol. 49 No. 1 (2022)
Section
ORIGINAL RESEARCH

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This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

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