Factors influencing in the rheological behaviour of alkali-activated mortars

Resumen del póster presentado a la International Conference on Construction Research / Eduardo Torroja: Architecture, Engineering, Concrete (AEC), celebrada en el Instituto de Ciencias de la Construcción Eduardo Torroja (IETCC-CSIC) del 21 al 23 de noviembre de 2018.Alkali- activated cements (AAMs) are an excellent alternative of Portland cement due to their economical, ecological, energy and technological benefits. However, there is a lack of knowledge concerning the rheological behavior of these cements, mortars and concretes, being essential to determine and predict the fresh and hardened characteristics of the final materials. Therefore, the main objective of this research is to study the rheological behavior of alkali- activated slag (AAS) and fly ash (AAFA) mortars, ascertaining the effect of the precursor, the nature and concentration of alkaline activators and also the nature and granulometry of the aggregates. All the results were compared with those obtained by the OPC mortars. The rheological tests conducted were: Stress Growth Test and flow curves to determine determination the yield stress and plastic viscosity. Results concluded that AAS and AAFA mortars are Bingham fluids. Furthermore, rheological behaviour of AAS mortars is more sensitive to the nature and concentration of alkaline activator than the AAFA mortars