RCC - During Concrete checks

During Concreting Checks   

1) Before starting concrete for the day, the gradation of fine and coarse aggregate shall be checked and if any deviation in combined gradation is observed, necessary corrections in
percentage of aggregates shall be made to achieve the desired combined gradation. This will ensure that concrete is cohesive and free from segregation and bleeding.

2) The concrete pipeline of pump shall be checked to ensure whether there is any leakage of slurry, which may affect the pumpability of concrete.

3) During concreting it must be checked whether there is any slurry leakage from the shuttering and corrective measures should be taken immediately because this may affect finishing because of honeycombing and final performance of the concrete and aesthetics.

4) Variation in pipe diameter of pump and number of bends in the pipeline should be restricted to minimum.

5) The supports/props must be checked during concreting to avoid bulging and potential failure of shuttering because of the weight of wet concrete.

6) Pouring height must be restricted as per the site condition with suitable methods to avoid segregation of concrete. 

7) Availability of sufficient equipment and manpower for compaction of concrete must be ensured

8) Vibrator needle size shall be appropriate as per the spacing of the reinforcement and workability of the concrete. Influence radius should be checked by visual observation

9) Over vibration of concrete should be avoided, which may lead to deposition of slurry at the top leading to crazing cracks any time during hardening. Over vibration may also lead to bleeding resulting in plastic settlement and subsequent cracks