Abstract
High performance concrete M60 cubes of 150 mm X 150 mm X 150 mm were tested experimentally under static loading. With the variation in the water binder ratios of 0.25, 0.28, 0.33, 0.39 and hyper plasticizer of 0.6%. 0.8%. 1.0%, 1.2% the cubes were cast and accordingly the cylinders were cast. For each ratio of water binder, 12 cubes and 2 cylinders were cast. Out of 12 cubes, 3 cubes were cured for 7 days, 3cubes for 15 days, 3 cubes for 21 days and the balance 3 cubes for 28 days. All the cubes were tested in a 2000kn compression testing machine. The load deflection curves, stress- strain curves were drawn for each cube and cylinder. The average compressive strength of each mix for different number of days of curing were calculated. The modulus of elasticity was calculated for each design mix.
Highlights
Concrete is widely being used in all types of structures as a main component
When people started the long span structure like infrastructures, skyscrapers, marine structures in the midst of ocean, the high strength and high performance concretes were invented by adding pozzolanic materials and admixtures for partial replacement or addition to cement and for low water cement ratios
The increase of the admixtures like silica fume or fly ash or zeolite or blast furnace slag increases the compressive strength of the concrete
Summary
Concrete is widely being used in all types of structures as a main component. When people started the long span structure like infrastructures, skyscrapers, marine structures in the midst of ocean, the high strength and high performance concretes were invented by adding pozzolanic materials and admixtures for partial replacement or addition to cement and for low water cement ratios. By reducing the water cement ratio and increasing the percentage of plasticizer the compressive strength of the concrete increases for the same mix ratios. The paper presents the results of experimental investigations carried out on varied water binder ratios with varied percentages of hyper plasticizer and number of days of curing. The typical quantities of materials used for the concrete mix with w/b ratio of 0.33 i.e., Cement: Fine Aggregate: Coarse Aggregates: Silica Fume = 1:1.73:2.51:0.055 and the percentage of hyper plasticizer is shown in (Table 1).
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