Checks Needed at Site During Concreting

Checks Needed at Site During Concreting

Proper co-ordination between the Ready Mix Concrete supply and placing and compacting gangs.

·     Proper signaling or communication at site is necessary.

·     Workability of concrete within accepted limits.

·     Adequacy of cohesiveness of concrete for pump ability.

·    Ensure that water addition or chemical admixtures are not added during transportation by RMC unauthorized persons and without the knowledge of the site in charge of the consumer.

·     Temperature of concrete at the time of receipt at site (if specified).

·     Continuous and steady supply at site and speedy unloading of the Monitor speed and progress of placing to avoid formation of cold joints transit mixers.

·     Monitor proper  placement without segregation.

·     Monitor placement of concrete at the closest possible point to its final location.

·     Arrange for curing as soon as finishing is completed. This is specially required in case of slabs, pathways and roads in hot/warm weather.

·     Retempering should be prohibited as experiments shows the addition of water to RMC truck at the construction site may result in substantial reduction in strength. The reduction in strength was found to be proportional to the increase in slump. Large increase in slump means higher reduction in strength. When the amount of water added is not controlled, reduction of strength may be as high as 35%. In cases where controlled amount of water is added to restore the slump within the specification’s limits (100 ±25 mm), the reduction of strength may be below 10%.