Thermal effects of activators on the setting time and rate of workability loss of geopolymers

Abstract

A number of parameters influence the properties of both fresh and harden geopolymer concretes. Similar to the case of OPC concretes, the fresh geopolymer concrete must also exhibit desirable rheology and setting behaviours in order to be useful for field applications. These properties of geopolymer concrete cannot be controlled using traditional super plasticisers, water reducer or set retarders. Therefore, the significance of understanding alternative methods to adjust the properties of fresh geopolymer concrete is very high. Use of solid alkali activators in geopolymer mixes is less hazardous than the commonly used liquid activators and yields a “cement like” mix, where only water is added..