Effect of limestone on rheological, shrinkage and mechanical properties of alkali - Activated slag/fly ash grouting materials

The effect of limestone powder (5%, 10% and 20%) on the rheological properties, drying shrinkage and mechanical properties of alkali-activated slag/fly ash grouting materials (AASFGM) are investigated. The results show that AASFGM with or without limestone powder conforms to the Bingham fluid model. The incorporation of fine limestone powder into AASFGM has a positive effect on rheology, strength and shrinkage properties. The yield stress, plastic viscosity and drying shrinkage properties activated by the solid waterglass are larger than those of the liquid type. However, the paste activated by the solid waterglass with 10% limestone powder exhibited satisfactory compressive strength and drying shrinkage after curing for 28 d. The shrinkage was decreased for finer limestone particle packing and filling to improve the compactness of AASFGM. (C) 2018 Elsevier Ltd. All rights reserved.