Influence of excess paste thickness on rheology, mechanical properties, and durability of concrete

The optimized mix design for concrete is important for quality and durability of concrete infrastructure and industrial applications. This study mainly investigates excess paste thickness's influence on rheology, hardened mechanical properties, and durability of concrete using gravel and crushed stone aggregate. The experimental results showed that excess paste thickness positively influences the rheological, and hardened mechanical properties. The continuous increase in slump with a reduction in yield stress and plastic viscosity was observed with an increase in excess paste thickness irrespective of the type of aggregate and superplasticizer. The gradual increase in compressive strength was observed with an increase in excess paste thickness up to an optimal point beyond that it started to decline. The impact of excess paste thickness on fresh and hardened mechanical properties is clearly explained as an illustration. Interestingly, no significant impact of excess paste thickness on concrete's abrasion resistance and chloride migration resistance was observed.