Compressive Strength Test

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CHAPTER-5 STRENGTH STUDIES ON CONCRETE 5.1 Compressive Strength Test according to IS 516-1959 This test is conducted on compression testing machine. The cubes prepared for testing are 150mm x 150mm x 150mm. The cube was placed in the compression testing machine and the load on the cube is applied at a constant rate up to the failure of the specimen and the ultimate load is noted. The cube compressive strength of the concrete mix is then computed. This test has been carried out on cube specimens at 7, 14 and 28 days age. The following testing procedure was undertaken during the modified cube compression testing: The measuring and testing of test specimens was undertaken as soon as possible after being removed from the curing tank. All specimens…show more content…
It was ensured there was no trace of lubricant on the bearing surfaces. The 150 x 150 mm plate was placed on top and bottom of the beam directly opposite each other. The specimens were centered on the bottom platen of the testing machine. The upper platen was lowered until uniform pressure was provided on the specimen. A force was applied at the required rate shown by the rotating disc on the testing machine. The maximum force applied to the cylinder was recorded and the compressive strength calculated by Compressive strength = P/A Where, p = maximum load in kg applied to the specimen A = cross sectional area of the cube on which load is applied (150 X 150 mm) The compression test was conducted according to IS 516-1959. The compressive strength was obtained after 7, 14 and 28 days of curing. Standard cast iron moulds of dimensions 150x150x150mm were used to cast the specimen. Figure 5.1: Compression testing Machine Figure 5.2: Compressive strength test 5.2 Split Tensile Strength Test according to IS…show more content…
The beam element is simply supported on two steel rollers of 38mm in diameter d these rollers should be so mounted that the distance from centre to centre is 400 mm for 10.0 cm specimens. The load is applied through two similar rollers mounted at the third points of the supporting span, which is spaced 13.3cm center to centre. The load is divided equally between the two loading rollers, and all rollers are mounted in such a manner that the load is applied axially and without subjecting specimen to any torsional stresses. The specimen is placed in the machine in such a manner that the load is applied to the uppermost surface as cast in the mould, along two lines spaced 13.3 cm apart. The axis of the specimen is carefully aligned with the axis of the loading device. No packing is used between the bearing surfaces of the specimen and the rollers. The load is applied without shock and increasing continuously at a rate such that the extreme fibre stress increases at a rate of 180 kg/min for the 10.0 cm specimens. The load is increased until the specimen fails, and the maximum load applied to the specimen during the test is recorded. Also the distance between the line of fracture and the nearer support is measured. In the present investigation, this test has been conducted on beam specimens after 7, 14 and 28 days of

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