TOP FIVE THUMB RULE TO BE CONSIDER WHEN USING AN ADMIXTURE IN CONCRETE.

When we use admixtures in concrete to enhance its quality and durability, We Should have to use IS 9103. This Indian standard covers the chemical and air-entraining admixtures including super-plasticizers, solid or liquid or emulsions etc.

Following points should be checked before use of admixture in concrete.

1. Admixtures should not impair durability of concrete nor combine with constituent to form harmful compounds nor increase the risk of corrosion of reinforcement.

2. The workability, compressive strength and the slump loss of concrete with and without the use of admixtures shall be established during the trial mixes before use of admixtures.

3. The relative density of liquid admixtures shall be checked for each drum containing admixtures and compared with the specified value before acceptance.

4. The chloride content of admixtures shall be independently tested for each batch before acceptance.

5. If two or more admixtures are used simultaneously in the same concrete mix, data should be obtained to assess their interaction and to ensure their compatibility.

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