IS 516 (1959): Method of Tests for Strength of Concrete (Highlighted Points)

Objective of  IS 516 (1959) Test

The following three tests covered by this IS 516 (1959): Method of Tests for Strength of Concrete:

1. Compressive strength of Concrete.
2. Flexural Strength
3. Modulus of elasticity of cement concrete

Making and Curing Compression Test Specimens in the Laboratory

The following steps will be adopted in the laboratory while performing the Test.

1. Sampling of Material: In this step, we will select the quality materials  (like sand and cement).
2. Preparation of Materials: All materials shall be brought to room temperature, before performing the test.
3. Proportioning: In this method, we will mix the prepared materials in the right proportions.
4. Weighing: Each batch’s quantities of cement, aggregate size, and water must be determined by weight, with an accuracy of 1% of the total weight of the batch.
5. Mixing of Concrete: The concrete must be mixed by hand, or preferably in a laboratory batch mixer so that no water or other materials are lost.
6. As we know that the Mixing of concrete maybe two types
   1. Machine Mixing: As the name indicate the process of mixing done by machine is known as machine mixing.
   2. Hand Mixing: In this method of mixing all processes of mixing are done by the labor or manual.
7. Workability: Immediately after mixing, each batch of concrete must be tested for consistency using one of the methods described in IS: 1199-1959. The concrete used for the consistency tests can be remixed with the remainder of the batch before making the test specimens, as long as no water or other material is lost. The re-mixing period should be as brief as possible while still producing a homogeneous mass.
8. Size of Test Specimens: The cubical test specimens must be 15 X 15 X 15 cm in size.
9. Moulds: This  Moulds may be different types
   1. Cube Moulds: ‘The height of the mould and the distance between opposite faces must be the specified size + 0.2 mm.
   2. Cylinders: The cylindrical mould shall be of metal which shall be not less than 3 mm thick.
   3. Temping Bar: The tamping bar must be a steel bar with a diameter of 16 mm, a length of 0.6 m, and a bullet point at the lower end.
10. Compacting: The compaction factor test is used to determine the degree of workability of fresh concrete in terms of the amount of internal energy required to compact it thoroughly. The compacting factor test is used to determine whether concrete has low workability. Compacting done by the following two methods
    1. Compacting by Hand: When compacting by hand, the standard tamping bar should be used, and the strokes of the bar should be evenly distributed across the cross-section of the mould.
    2. Compacting by Vibration:  In this process, a vibration rod is used to compact the mould.

Also Read:  Various tests on cement

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