Concrete placement is one of the most critical stages in reinforced concrete construction.

By the time concrete arrives at the point of placement, considerable work may already have gone into excavation, formwork, reinforcement, services coordination and inspection. Labour, equipment and sometimes concrete pumps are waiting.

Rejecting concrete at this stage can therefore be inconvenient and costly.

But inconvenience is not a technical criterion for acceptance.

Equally, concrete should not be rejected casually merely because something about it appears unusual.

The appropriate decision should be based on the project specifications, the approved concrete mix, delivery and production records, relevant test results, site observations and sound engineering judgement.