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IS 516:1959 Most Important Point (Method of Tests For Strength of Concrete)
- As per IS 516:1959, a representative sample of the materials of concrete for construction work shall be obtained by careful sampling.
- For machine mixing, the period shall not be less than 2 minutes until the concrete is uniform in appearance.
- For hand mixing, cement and fine aggregate should be mixed dry until it is uniformly colored, followed by the addition and mixing of coarse aggregate until uniformly distributed and finally adding water until it is homogeneous.
- The tamping bar for cubes shall be steel with a bullet-pointed lower end and 16mm in diameter and 0.6m long.
- In the cube compaction by hand, 35 strokes per layer for 15cm cubes and 25 strokes per layer for 10cm cubes are recommended.
- For cube curing in the lab, the specimens shall be stored in a place with at least 90% relative humidity and a temperature of 27±2°C for 24 hours from the time of adding water to the dry ingredients, followed by immediate submersion in clean, fresh water or saturated lime solution until testing.
- Cube specimens stored in the field shall be kept under damp matting/sacks or similar material for 24 hours from the time of adding water to the dry mixes within the temperature range of 22-32°C.
- For concrete cube testing, the report must include identification mark, date of test, age of specimen, curing condition, weight, dimensions, sectional area, maximum load, compressive strength, and appearance of fractured concrete face.
- The IS 516:1959 code outlines the procedure for making and curing concrete test cubes and conducting compression tests to determine the compressive strength of concrete.
- For concrete slump test, the IS code for India is IS 1199:1959.
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