ACI Concrete Transportation Inspector Practice Test

When contamination is detected in a truck discharge, the priority is to prevent cross-contamination and protect mix quality. The correct approach is to stop the discharge, segregate the current batch, document what happened, and follow the corrective action defined in the contract. Stopping the discharge halts the spread of residues into the fresh mix, while segregating the batch keeps the contaminated portion separate so it can be managed according to established procedures. Documenting the contamination creates a record for traceability, QA, and contract compliance, which is essential for accountability and future reference. Following the contract’s corrective action ensures the issue is resolved properly—this may involve retesting, disposing of the affected material, or rework as defined by the agreement. This method protects concrete properties (slump, air content, strength, color), maintains safety and quality standards, and avoids liability. Rinsing briefly, ignoring the contamination, or returning the truck without action do not address the risk to the new batch or meet contractual and QA requirements.