# Five decisions that shape concrete quality

> The essentials that matter on site, from specification to curing.

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- Last updated: 2026-08-24
- Dil / Language: English

## Summary

- Correct specified class
- Proper placing and vibration
- Consistent curing control

## Quality begins in the decision chain

Concrete performance depends on more than the ordered class. Design, production, transport, placing and curing must all support the same quality objective.

## Placing and curing make the unseen difference

Appropriate vibration reduces void risk, while correct curing limits early moisture loss. Weather, pour timing and surface protection belong in the site plan.

## Control becomes stronger when it is recorded

Recording delivery tickets, samples, temperature, pour time and curing start makes the process traceable and helps identify issues earlier.

## Preparation is completed before the concrete arrives

Formwork cleanliness, reinforcement and cover, service openings, pump position, access, vibrators and backup equipment should be verified before delivery. The team should understand the pour plan and know who responds to interruptions or changing weather.

## A sample result does not tell the whole story

Standard samples help assess the potential of delivered concrete; in-place performance is also affected by transport, placing, consolidation, temperature and curing. Results should be interpreted by the authorised engineer alongside project criteria and site records.

## Frequently asked questions

### Can water be added to concrete on site?

Unauthorised changes to the mixture can affect strength and durability. Any adjustment must follow the specification and authorised technical control.

### Why is curing so important?

Curing maintains early moisture and temperature conditions, supporting hydration and the development of strength and durability.

### Is the 28-day sample result enough?

It is an important control, but in-place workmanship, records and project criteria must also be considered.

## Sources

- [American Concrete Institute · What is curing?](https://www.concrete.org/frequentlyaskedquestions.aspx?faqid=789)
- [NRMCA · CIP 11 Curing In-Place Concrete](https://www.nrmca.org/wp-content/uploads/2021/01/11pr.pdf)

> Content is prepared to be clear, practical and technically responsible. Project-specific decisions require assessment by an authorised professional.