Where should the temperature reading for fresh concrete be taken?

• A. In the point of discharge or representative sample
• B. On the surface of the truck
• C. In the ambient air near the truck
• D. In the drum around the edge

Answer: (A)

The temperature reading for fresh concrete should reflect the actual mix you’re placing, so it’s taken at the point of discharge or from a representative sample. Measuring here captures the true temperature of the concrete as it will be placed, which is crucial because temperature affects how quickly hydration occurs, early strength development, and curing needs. If you check temperatures on the surface of the truck, in the surrounding air, or around the edge of the drum, you’re getting readings influenced by surfaces or environment rather than the batch itself, and those won’t accurately indicate the concrete’s temperature.