Rheological behavior of fly ash-based geopolymers with the addition of superplasticizers

Abstract

Geopolymers are novel cementitious binders that are finding new industrial applications every day. One of the most important aspects for the commercialization of these products is their behavior in plastic state. The workability of fresh geopolymer paste can be measured with several common tests used for Portland cement concrete, like flow and slump; however, a more in-depth characterization of their rheology is essential to understand its basic setting mechanisms. In this article, the rheological behavior of geopolymer paste prepared under different mix design formulations is studied. Special consideration is given to the rheological behavior of geopolymer paste under the action of a superplasticizer. The effect of the superplasticizers on the viscosity of fresh geopolymers was evaluated and recommendations about the use of these additives are provided.