Effect of different types of superplasticizer on fresh, Theological and strength properties of self-consolidating concrete

摘要

The effect of different types of superplasticizer on fresh, rheological and strength properties of self-consolidating concrete (SCC) was investigated. The admixtures had same main chain and same polymer structure but different molecular weight and different side chain density of carboxylic acid groups. Fresh concrete properties were determined by using the slump-flow, V-funnel, slump-flow loss and L-box tests. Besides, the rheological parameters including apparent yield stress and plastic viscosity were measured by using a concrete rheometer. The compressive strength, ultrasonic pulse velocity and dynamic elastic modulus of SCC mixtures were determined at 1,3,7 and 28 day ages. Test results indicated that V-funnel flow time, plastic viscosity and slump retention of SCC mixtures were affected by the side chains density of polymer considerably. It was observed that the compressive strength of SCC mixtures was also influenced slightly with the incorporation of different types of superplasticizers. The effect was more pronounced at early ages.