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Effect of CaSO4 Incorporation on Pore Structure and Drying Shrinkage of Alkali-Activated Binders

Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Korea
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Materials 2019, 12(10), 1673; https://doi.org/10.3390/ma12101673
Received: 25 April 2019 / Revised: 15 May 2019 / Accepted: 17 May 2019 / Published: 23 May 2019
(This article belongs to the Special Issue Microstructures and Durability of Cement-Based Materials)
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Abstract

This present study investigates the effects of CaSO4 incorporation on the pore structure and drying shrinkage of alkali-activated slag and fly ash. The slag and fly ash were activated at a 5:5 ratio by weighing with a sodium silicate. Thereafter, 0%, 5%, 10%, and 15% of CaSO4 were incorporated to investigate the changes in phase formation and internal pore structure. X-Ray Diffraction (XRD), thermogravimetry (TG)/derivative thermogravimetry (DTG), mercury intrusion porosimetry (MIP), nuclear magnetic resonance (NMR), and drying shrinkage tests were carried out to find the correlation between the pore structure and drying shrinkage of the specimens. The results showed that CaSO4 incorporation increased the formation of thenardite, and these phase changes affected the pore structure of the activated fly ash and slag. The increase in the CaSO4 content increased the pore distribution in the mesopore. As a result, the capillary tension and drying shrinkage decreased. View Full-Text
Keywords: slag; fly ash; CaSO4; pore structure; drying shrinkage slag; fly ash; CaSO4; pore structure; drying shrinkage
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Son, H.; Park, S.M.; Seo, J.H.; Lee, H.K. Effect of CaSO4 Incorporation on Pore Structure and Drying Shrinkage of Alkali-Activated Binders. Materials 2019, 12, 1673.

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