Aggregates occupies about (60 to 75) per cent of the concrete volume, and therefore the concrete strength is impacted by the maximum size of coarse aggregate (MSC-A).In this study, the components of the mixture are completely redesigned according to the MSC-A. Concrete mixture containing great gravel particles needs low water than small gravel particles, In other words, a small gravel particles has more surface area than a large gravel particles. In this research, about twenty two mixtures were covered to study the impact of the MSC-A on compressive strength (fcu) of concrete. The American design method was adopted (ACI 211.1-91) for concrete mixtures. And use the MSC-A with dimensions (9.5, 12.5, 19, 25, 37.5 and 50) mm. The slump was fixed (75-100) mm. With fineness modulus of sand (F.M) fixed (2.8). According to the results of the tests, the fcu increases with the increase in the MSC-A.
Volume 12 | Issue 4