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http://dx.doi.org/10.14190/JRCR.2021.9.1.1

Modified-stoichiometric Model for Describing Hydration of Alkali-Activated Slag  

Abate, Selamu Yihune (Bless Construction PLC)
Park, Solmoi (Department of Civil Engineering, Pukyong National University)
Song, Keum-Il (Department of Architectural Engineering, Chonnam National University)
Lee, Bang-Yeon (School of Architecture, Chonnam National University)
Kim, Hyeong-Ki (Department of Architectural Engineering, Chosun University)
Publication Information
Journal of the Korean Recycled Construction Resources Institute / v.9, no.1, 2021 , pp. 1-12 More about this Journal
Abstract
The present study proposes the modified-stoichiometric model for describing hydration of sodium silicate-based alkaliactivated slag(AAS), and compares the results with the thermodynamic modelling-based calculations. The proposed model is based on Chen and Brouwers(2007a) model with updated database as reported in recent studies. In addition, the calculated results for AAS are compared to those for hydrated portland cement. The maximum difference between the proposed model and the thermodynamic calculation for AAS was at most 20%, and the effects of water-to-binder ratio and activator dosages were identically described by both approaches. In particular, the amount of non-evaporable water was within 10% difference, and was in excellent agreement with the experimental results. Nevertheless, notable deviation was observed for the chemical shrinkage, which is largely dependent on the volume of hydrates and pores.
Keywords
Alkali-activated slag; Hydration; Stoichiometric model;
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