Traffic Closure Duration is associated with which statement?

• A. Traffic closure duration ends after the concrete reaches 2000 psi.
• B. Traffic closure durations unrelated to strength.
• C. Traffic closures last 24 hours regardless of strength.
• D. Traffic closures are not required for any concrete works.

Answer: (A)

Traffic closure duration is determined by concrete strength, not by a set time. In FDOT practice, opening to traffic is allowed once the placed concrete reaches a specified compressive strength, commonly 2000 psi, as confirmed by cylinder test results. This ensures the pavement has developed enough stiffness and load-carrying capacity before vehicles drive on it. So, the statement that closure ends after the concrete reaches 2000 psi best fits how closures are managed. The other ideas don’t align with this strength-based approach: relying on a fixed time would ignore how quickly or slowly the concrete cures, a universal 24-hour rule doesn’t guarantee adequate strength, and not requiring closures would risk damage to fresh concrete.