Reinforced concrete fails for predictable reasons. A sequence of checks from mix approval to curing, with what each stage must produce.
Concrete is the one material you cannot inspect after installation without destroying it. Everything that determines its performance happens before, during and immediately after the pour, which is why quality control for concrete is a sequence rather than an inspection.
Before stage one
Before the first pour is scheduled, the mix design should be approved, the supplier confirmed, the testing laboratory appointed and the inspection hold points written into the programme so nobody treats them as an interruption.
- Approved mix design matching the specified strength and exposure conditions.
- Accredited testing laboratory appointed and its scope agreed.
- Hold points for reinforcement inspection written into the construction programme.
- Curing method agreed in advance, including water availability in hot weather.
Stage 1: Mix design approval
Review the proposed mix against the specified strength, exposure class and workability, including cement type and any admixtures.
- Deliverable: Approved mix design with supporting trial results.
- Owner: Structural engineer with the supplier.
- Approval gate: No concrete is ordered against an unapproved mix.
Stage 2: Formwork and level check
Verify formwork dimensions, alignment, support and tightness, since formwork failure during a pour is both dangerous and expensive.
- Deliverable: Formwork inspection record with dimensions verified.
- Owner: Contractor, checked by supervision.
- Approval gate: Formwork signed off before reinforcement is fixed.
Stage 3: Reinforcement inspection
Check bar diameter, spacing, lap lengths, cover and the placement of any additional bars, against the structural drawings.
- Deliverable: Signed reinforcement inspection record with photographs.
- Owner: Supervising engineer.
- Approval gate: This is the critical hold point. Once concrete is placed, nothing here can be verified again.
Stage 4: Services coordination check
Confirm that conduits, sleeves and openings are in place before pouring, so nobody cuts into the structure afterwards.
- Deliverable: Marked drawing showing embedded items verified on site.
- Owner: Contractor with services subcontractors.
- Approval gate: Pour proceeds only after embedded items are confirmed.
Stage 5: Pouring and sampling
Place and compact the concrete properly, and take test cubes from the load in accordance with the specification.
- Deliverable: Delivery notes and sampling records tied to the specific pour and location.
- Owner: Contractor, witnessed by supervision.
- Approval gate: Sampling recorded at the time of the pour, not reconstructed afterwards.
Stage 6: Curing
Keep the concrete moist and protected for the specified period, which matters far more in high temperatures than most sites treat it.
- Deliverable: Curing record showing method, duration and responsible person.
- Owner: Contractor.
- Approval gate: Formwork struck only after the specified period and confirmation of strength gain.
Stage 7: Test results and acceptance
Receive laboratory results at the specified ages and compare them against the required characteristic strength.
- Deliverable: Laboratory certificates linked to the pour location.
- Owner: Testing laboratory reporting to the owner or supervisor.
- Approval gate: Results accepted before the payment covering that structural element is certified.
Handovers between stages
The most dangerous handover in this sequence is between reinforcement fixing and pouring. Once trucks are on site, the pressure to proceed is commercial and physical, and it is the moment where inspection is most likely to be skipped and least recoverable.
How you know it is finished
A structural element is complete when its reinforcement record, delivery notes, sampling record, curing record and laboratory results exist and agree with each other. Concrete that stands up without this documentation is untested, not proven.
If you are preparing to build, Domira can review your drawings, scope and contractor offers before you commit, and supervise delivery against the programme and specification you agreed.
Frequently Asked Questions
Who should take the concrete test samples?
An independent accredited laboratory, sampling on site at the time of the pour. Samples supplied later by the contractor, or results that cannot be tied to a specific pour and location, do not tell you what you need to know about your building.
What happens if test results come back below the specified strength?
The structural engineer assesses the element, and options range from further testing of the in-place concrete to strengthening or, in serious cases, removal. This is why results must be reviewed before the covering work proceeds and before that payment is certified.
Does curing really matter in a hot climate?
It matters more, not less. High temperatures and low humidity accelerate moisture loss, which affects strength development and causes early cracking. Curing method and duration should be agreed before the first pour, including who is responsible for it over weekends.
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