The Influence of Viscosity-Modifying Admixture (VMA) on the Performance of Self-Consolidating Concrete (SCC)

Abstract

This paper describes how the stability of highly fluid self-consolidating concrete (SCC) can be achieved by using a viscosity-modifying admixture (VMA). Currently, there are several types of VMAs available in the market place. Three of the most common types are based on cellulose-ethers, biopolymers and synthetic polymers. This paper studied and compared the properties of these three types of VMAs. Specifically, the influence of these three types of VMAs on the properties of self-consolidating concrete (SCC was studied. Particular attention was placed on the influence of each VMA on the following characteristics of the SCC: (1) dose response of high range water reducer (HRWR); (2) dose response of air entraining agent (AEA): (3) stability of the mixture; (4) effects on time of setting; and (5) compressive strength development.