Alkali-activated mortars: Workability and rheological behaviour

AAS and AAFA mortar workability was more sensitive to changes in the liquid/solid ratio than OPC mortars. In AAM mortars, fluidity was found to be proportional to the liquid/solid ratio and dependent upon aggregate content. When in a plastic state, AAS and AAFA mortars activated with waterglass solutions exhibited larger spreads and greater workability than OPC mortars, confirming the fluidising effect of waterglass. Rheology of AAS mortars was more influenced by the nature and concentration of the alkaline activator than that of AAFA mortars. Rheological behaviour of AAS and AAFA mortars fits the Bingham model.