A STUDY ON EFFECTS OF SIZE COARSE AGGREGATE IN CONCRETE STRENGTH

The utilization of four types of aggregate for concrete work is investigated in this paper. Normal concrete is being produced from different types of aggregate and this imparts different property to the resulting concrete. The most important property of concrete is its compressive strength. For the purpose of this work, there are 4 types of aggregate size used for this study were classified as aggregate size 10, size 20, size 30 and mix aggregate. Concrete cube specimens of mix 1:1:2 were prepared with water-cement ratio of 0.5. The cubes were cured using methods water-submerged curing until testing ages of 7, 14, 21 and 28 days before the result determined. Some laboratory tests will be carried out in this study for the purpose of knowing the difference between the uses of different size aggregate in the concrete mix design. The tests carried out are as follows slump test, density test, flexural test, compression test, shrinkage and expansion test, ultrasonic pulse velocity test, water absorption test and permeability test. According to laboratory tests, we can conclude that size 30 and mix aggregates are the best choice in concrete design.