INFLUENCE OF LIME ON THE PROPERTIES OF CEMENT-BASED MATERIALS

摘要

Slabs are subjected to many important drying effects due to their large exchange surface area, particularly plastic and drying shrinkage. The use of suitable mineral additions with shrinkage reducing properties is necessary to improve cement-based materials behavior. The aim of the experimental work carried out is to investigate the influence of natural hydraulic lime (NHL) and aerial lime (AL) on the properties of cement mortars at fresh and hardened state. A reference mortar was designed with a water-to-cement ratio of 0.6. At a constant paste volume, cement was replaced with increasing mass proportions of 12.5%, 25% and 50% of NHL. The approach used shows that the substitution of cement by either type of lime reduces plastic and drying shrinkage, but negatively affected rheological behavior and compressive strength. The findings of this paper highlight the benefits of lime/cement substitution on the volume changes in cement mixtures at early age and long-term.