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Compressive Strength of Cement. This test is carried out to determine the compressive strength of cement. Test Procedure for compressive strength of cement: (i) The mortar of cement and sand is prepared. The proportion is 1:3 which means that (X) gm of cement is mixed with 3(X) gm of sand.

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Hydraulic Cement Mortars are typically formed by a combination of cement, sand, and water, but may include a variety of other materials in the mix. The strength of the final mortar is strongly dependent on the type of materials and the ratio of the components, and testing is required to determine the correct proportions for each application.

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The compressive strength of concrete is given in terms of the characteristic compressive strength of 150 mm size cubes tested at 28 days (fck). The characteristic strength is defined as the strength of the concrete below which not more than 5% of the test results are expected to fall.

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Compressive strength of mortar is determined by using 2 inch or 50mm cubes as per ASTM C109 / C109M – Standard Test Method for Compressive Strength of Hydraulic Cement Mortars. Mortar is a combination of cement, sand mixed with water.

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