What is the purpose of a concrete temperature measurement instrument during transit inspections?

• A. To monitor concrete temperature to ensure compliance with project specs and to predict set time and workability.
• B. To measure air content in the fresh concrete.
• C. To determine the color of the concrete.
• D. To assess the slump without testing.

Answer: (A)

Monitoring the temperature of fresh concrete during transit is essential because temperature directly affects how quickly hydration occurs, which in turn governs set time, strength development, and workability. By keeping the concrete within the specified temperature range, inspectors can verify that the mix will behave as intended once placed: too hot can speed up hydration and shorten the workable window, increasing the risk of early stiffening or cracking; too cold can slow hydration and delay strength gain. Measuring temperature allows the team to predict when the concrete will set and how workable it will remain during placement and finishing, helping coordinate timing and any needed adjustments. This is specific to temperature and its impact on performance, whereas other tests for air content, color, or slump rely on different instruments and procedures.