Performance-Evaluation of Concrete Properties for Different Combined Aggregate Gradation Approaches

Aggregate takes up 60%∼90% of total volume of concrete. Thus, concrete properties are highly affected by physical properties of its aggregate such as aggregate size distribution. With a view to achieve optimized gradation, there are various aggregate gradation tools or methods, such as, gradation curve, individual percent retained (IPR) curve, “8-18” band and combined fineness modulus (fineness modulus of total aggregate) etc. In this research, a comparative analysis of various tools and methods of aggregate gradation was performed through a number of trial mixes. Also a comparison of combined gradation and fractional (mixing fine and coarse aggregate) gradation is given. The workability, density and strength results from these concrete mixes are finally compared to propose a suitable aggregate gradation.