INFLUENCE OF CALCIUM SULFATE ON DEVELOPMENT OF EARLY-AGE RHEOLOGICAL PROPERTIES IN SELF-LEVELING UNDERLAYMENTS BASED ON ETTRINGITE BINDER

  • Nguyen Ngoc Lam Faculty of Building Materials, National University of Civil Engineering (NUCE)

Abstract

The aim of this study is to evaluate the effect of the types and the amount of calcium sulfate (C$Hx) replacing calcium aluminate cement (CAC) in ettringite binder on the early-age rheological properties of self - leveling underlayment. The evolution of rheological properties such as yield stress, plastic viscosity, rheological dynamic modulus (storage modulus and loss modulus) was determined by a rheometer with the rotation mode and the oscillation mode. The use of these technics is considered as a method to monitor the development of structure in cementitious materials. Increasing the yield stress, plastic viscosity and dynamic modulus of the self - leveling underlayment during hydration was identified from just 5 minutes after mixing to the period where the transition from a fluid state to a solid state where the development of elastic properties in the self - leveling underlayment takes place. The result shows that the structuration of compositions based on anhydrite (C$ - CaSO4) or compositions containing 90CAC/10C$Hx is faster than that of the composition 75CAC/25C$Hx or the compositions based on hemihydrate (C$H0.5 or CaSO40.5H2O).

Keywords: Self - leveling underlayment; calcium aluminate cement; calcium sulfate; ettringite binder; rheological properties.

Received: August 24th, 2016, revised: September 5th, 2016, accepted: October 13th, 2016

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Published
31-10-2016
How to Cite
Lam, N. (2016). INFLUENCE OF CALCIUM SULFATE ON DEVELOPMENT OF EARLY-AGE RHEOLOGICAL PROPERTIES IN SELF-LEVELING UNDERLAYMENTS BASED ON ETTRINGITE BINDER. Journal of Science and Technology in Civil Engineering (JSTCE) - HUCE, 10(5), 102-109. Retrieved from https://stce.huce.edu.vn/index.php/en/article/view/301