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Apparatus Required
- Cube moulds ( Size 150mm×150mm×150mm )
- Tamping Rod 16mm dia & 600mm long
- Sampling Tray
- Trowel
The procedure of the test
- Collect the fresh concrete of the required grade.
- Check the Slump before casting the cubes and ensure that the slump of concrete should be as per the requirement of structure.
- Check for the cleanliness of the mould & it has to be oiled, take a required number of cube moulds for casting.The required numbers of cube to be cast as per the Codal provision are given below:
-
Quantity of Concrete in
the Work (Cum)Number of Samples
1-5
1
6-15
2
16-30
3
31-50
4
51 and above
4 + one additional
sample for each additional 50cum or part thereof - Pour the concrete in the mould till 1/3rd full, compact with the tamping rod to get 100% compaction, not less than 35 strokes.
- Repeat the above for the next two layers, after compaction of the 3rd layer level the concrete with a trowel.
- Note the cube mould number in the record for the particular grade of concrete.
- Before de-moulding the cube moulds ,the next day give the proper identification on the test sample.
- After de-moulding the cube mould place the concrete cube sample 3nos in 7 days curing tank, and rest in 28days curing tank.
- Crush the cubes for compressive strength at their corresponding dates.
- Report the corresponding day’s test results.
