How do you check concrete transport claims in Qardho?

Concrete transport competency risks in Qardho come down to one gap: a contractor says the crew can move concrete from mixer to formwork without it separating, and nobody checks the claim against records. Segregation before placement starts in the drum, the chute or the wheelbarrow run, not at the poker vibrator. The claim is easy to make and hard to disprove from a bid document alone.

What does a transport claim actually prove?

A claim proves nothing until it is tied to records from a pour the contractor has already done. Concrete is heavy and thixotropic. Once coarse aggregate settles out of the mortar, no amount of re-mixing on site restores the designed mix, and the placed concrete can show honeycombing, weak zones and exposed steel after stripping. That mechanism is general practice, not a Qardho finding. What varies locally is who kept the paperwork. Ask for the batch or mix design sheet, the delivery docket times from plant to discharge, and the cube or cylinder test results for a recent job. Ask the contractor to name the site, the date and the engineer who supervised it. A firm that cannot produce those records is asking you to accept an unverified claim. The municipal engineer's office may hold records for public works and can tell you what it expects on private jobs.

How do you close the gap before signing?

Close it by making transport a written, checkable part of the contract instead of a verbal promise. Ask for a one-page transport plan: the route from the batching point, the number and type of trucks or mixers, the expected travel and discharge time per load, the slump or workability check on arrival, and the name of the person who will stop a load that has waited too long. General practice treats long travel and hot, dry conditions as risks to workability, and the project specification or engineer should set the limits for your pour, not a rule of thumb. State in the plan what happens to a rejected load, and let the contract, not a site argument, decide who pays for it. Check what your contract allows before you rely on any remedy.

How do you test the claim on a live pour?

Test it by standing at the discharge point and watching the first load arrive. Watch whether the drum turns while the truck waits, whether the chute is wet before discharge, and whether the crew places the concrete near its final position instead of dragging it along the formwork. Take the slump reading yourself if the specification calls for one, and log the time of every load. Photograph the surface after each pass and again after stripping. A crew with real transport competence will welcome the record because it protects them too. Ask the municipal engineer's office what records it wants to see for a job of your type, and ask two contractors to show you a recent delivery log side by side.

What to do next

Write the transport plan into the tender documents and ask every bidder to return it signed with their price. Before awarding, call the engineer named on the contractor's most recent pour and ask two questions: did the loads arrive within the agreed time, and did any load get rejected. Keep your own delivery log from the first pour of your build.