Coarse aggregate accuracy within 1% is a requirement of which criterion?

• A. Water-Cementitious Ratio (Acceptance)
• B. Aggregate Accuracy
• C. Initial Concrete Temperature
• D. Retarding Admixture

Answer: (B)

This is about controlling how closely the amount of coarse aggregate in each batch matches the specified target. Keeping the coarse aggregate within 1% of the prescribed mass ensures the batch proportions stay true to the design, which helps maintain the intended water–cementitious ratio, workability, and ultimately strength and durability. In practice, the inspector verifies this by using a calibrated scale and confirming the measured aggregate weight falls within ±1% of the target; small deviations in aggregate mass can cause larger shifts in batch performance.

The other items deal with different aspects: the water–cementitious ratio acceptance focuses on the ratio itself rather than aggregate mass; initial concrete temperature concerns heat/temperature at placement; retarding admixture deals with delaying set time, not measurement accuracy of ingredients.