Author(s): Aparna Sai Surya Sree Nedunuri and Salman Muhammad



The production of ordinary Portland cement (OPC) contributes enormously to global anthropogenic CO2 emissions and alkali-activated binders are one of the potential alternatives to OPC.

To use these materials as a replacement of OPC-based binders, they need to be engineered to overcome the drawbacks, one of which is the rapid setting that leads to the reduced workable time. In this study, an attempt has been made to investigate the dependence of rheological parameters—namely, yield stress, apparent viscosity, and spread diameter (mini-slump) of alkali-activated slag and fly ash binders—on the oxide composition of the precursor, solid content, molar modulus, and activator dosage.

It has been observed that the calcium oxide content plays a major role in the evolution of rheological parameters. Results showed that the yield stress and apparent viscosity were also influenced by molar modulus, activator dosage, and solid content.

Keywords: alkali-activated binders; apparent viscosity; mini-slump; oxide composition; solid content yield stress

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