What is the purpose of specifying a moisture correction for aggregates in transit testing?

• A. To adjust the batch water content to account for aggregate moisture, maintaining the intended slump and performance
• B. To reduce cement content
• C. To increase air content
• D. To change the color of concrete

Answer: (A)

Moisture in aggregates affects how much water actually participates in the concrete mix. When aggregates are in transit, their moisture content can differ from what was assumed when the mix was designed. Applying a moisture correction means adjusting the water added to the batch so the real water-to-cement ratio matches the design, which keeps the slump and overall performance on target. If the aggregates are wetter than expected, you reduce the added water; if they’re drier, you add more water. This ensures consistent workability and strength, and it isn’t about changing cement content, air content, or color.