However, the trial mixes are expected to show higher mean strength as compared to mean strength of in-situ cast cube test result to minimize the risk. Therefore, trial mixes and slump testing prior to acceptance of concrete are carried out to ensure the concrete is having the specified strength. However, the strength of the concrete cannot be assured instantly as like metals once they delivered from the production line because it requires a reasonable time to gain it's expected strength. The quality assurance of concrete is the prime concern in the construction since inferior quality of concrete causes serious issues with respect to strength and durability during the life span of the structures.
