What is the role of QA/QC during concrete placement and curing?

• A. Approve payments for concrete deliveries.
• B. Verify mix design compliance, placement, consolidation, finishing, curing procedures, and record test results (slump, air, compressive strength).
• C. Manage site safety certificates.
• D. Schedule crane operations.

Answer: (B)

Quality assurance and quality control during concrete placement and curing centers on verifying that the concrete work follows the approved mix design and project specifications, and on documenting the results to prove performance. This means checking that the delivered concrete matches the mix design in proportions and properties, ensuring proper placement and consolidation to eliminate voids, applying finishing and curing procedures as specified, and recording test results such as slump for workability, air content for durability, and compressive strength to confirm strength targets are met. These records and verifications provide the evidence needed to accept or reject the concrete and guide any necessary actions to protect performance.

Other project tasks like approving payments, managing safety certificates, or scheduling crane operations are important to project execution but fall outside the primary QA/QC focus on concrete quality, compliance with design, and documentation of test results.