Top points to be observed while supervising R.C.C. work

In construction field whenever if you are supervising R.C.C. work, you must observe the following top points are given as below:

1. Cement:
This should comply with the standard requirements and cement, which has become hard due to moisture or any other reason, should be discarded and not used for the work.

2. Coarse aggregate:
It should be properly graded as required. It should be clean and free from impurities such as earth, coal dust and other organic materials. The unclean coarse aggregate should be screened and washed before use.

3. Fine aggregate:
The sand to be used as fine aggregate should be clean and coarse. It should be free from organic or vegetable matters. The sand should be washed, if there is any trace of earth in it.

4. Water:
The mixing water for concrete should be clean and fresh. Usually, the water, which is fit for drinking, should be used for preparing concrete.

5. Proportion:
The proportion of cement concrete should be as per specification of the work. The necessary allowance should be made for the bulking of sand.

6. Centering:
The centering or formwork for concrete work should be sufficiently strong surface. It should be removed only after getting written permission of the engineer in charge of the work.

7. Reinforcement:
It should be placed as per design given by the engineer and it should be free from rust, oil, mud, etc. The steel to be used as reinforcement should comply with the standard reuirements Extreme care should be taken to see that the reinforcement is not disturbed during placing of the concrete.

8. Mixing:
The mixing should be done either in a mechanical mixer or by hand operations. The former is adopted for large quantities of cement concrete while the latter is adopted for small quantities of cement concrete. The engineer, in charge of the work, decides the mode of mixing.

9. Transporting and placing:
The cement concrete should be carefully transported and placed in position with usual precautions.

10. Consolidation:
For consolidation of concrete, the hand tools or vibrators may be used and concrete should be tapped in such a way that no honeycomb surface appears on removal of the formwork. It should be seen that all edges and corners of the concrete remain unbroken, sharp and straight in line.

11. Curing:
The curing is the most important part of construction specially in R.C.C. work. The concrete should be kept moist or wet by a suitable method of curing. The period of curing is generally mentioned in the specification of the work. But in any case, it should not be less than 10 days.

12. Finishing:
The finishing of all exposed surfaces of concrete should be carried out as per requirements of the specification of the work.

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