Influence of type of calcium sulfate on chemical shrinkage and heat of hydration in self-leveling underlayments using ettringite binder

  • Nguyen Ngoc Lam

Abstract

Chemical shrinkage of cementitious materials relates to the early-age volume change of mortar and concrete. Therefore, determining exactly the chemical shrinkage plays a significant role in predicting and preventing early-age cracking in materials using cement as binder. In this study, the chemical shrinkage of self leveling underlayment using ettringite binder is investigated by a buoyancy method, data was recorded automatically for studying the hydration kinetics of the binder. The results show that the chemical shrinkage of self-leveling underlayerments using hemihydrate CaSO4.0.5H2O is smaller than that of self-leveling underlayerment using anhydrite CaSO4. However, the hydration rate of the anhydrite-based mixtures occurs faster than that using hemihydrate.

Received: January 16th, 2018; revised: February 13th, 2018; accepted: February 28th, 2018

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Published
17-04-2018
How to Cite
Lam, N. (2018). Influence of type of calcium sulfate on chemical shrinkage and heat of hydration in self-leveling underlayments using ettringite binder. Journal of Science and Technology in Civil Engineering (STCE) - NUCE, 12(2), 92-97. https://doi.org/10.31814/stce.nuce2018-12(2)-14
Section
Research Papers