Procedure:1. Monitor 2 to 3 trucks successively when supplying to 1 project, choose low slump mixes when checking2. After site discharge, instruct drivers not to wash or put water in the balldrum of mixer ask them to return immediately to the plant.3. Upon arrival of chosen truck, discharged 200liters of water measured from the batching plant.4. Rotate repeatedly to loosen concrete sticking on the drum5. Discharge in a pre-measured container (White tank for curing samples, Mr. Dat controls this containers).6. Measurement.
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