RMC Pour Planning for a Commercial Slab: Trucks, Pumps and the Cold Joint

Plan an RMC slab pour around the truck cycle, not around the clock.

Key Takeaways

  • Fix the pour sequence and truck interval before the first truck leaves.
  • Keep concrete moving so no bay waits long enough to set.
  • Record every truck ticket with time, grade and slump on site.

Fix the Pour Sequence First

A commercial slab pour starts on paper, with the slab divided into bays and the pouring order marked on the drawing. Placing ready mix concrete bulk orders without a written plan leaves the site exposed, because a plant that does not know the pour rate will send trucks on its own schedule.

Position the Pump and the Pipeline

Pump placement decides how far the concrete travels and how many bends the pipeline has. Dumping concrete in one spot segregates the mix, pushing coarse aggregate to the edges and leaving cement paste in the middle. Good rmc suppliers in lucknow usually send a technician with the first truck, and that technician checks the slump at the site and records it on the ticket.

Stop the Cold Joint Before It Forms

A cold joint forms when a bay of concrete begins to set before the next load arrives against it. A load that arrives outside the agreed slump range is rejected, and the rejection is written on the ticket with the time and the reason. BTech Mart buyers who keep this record habit find that disputes over strength or finish are settled by documents rather than by argument.

  1. Mark the bays and the pour order on the drawing.
  2. Confirm grade, slump and truck interval with the plant.
  3. Inspect shuttering, steel and cover blocks before booking the first truck.
  4. Place the pump close to the pour with the fewest pipeline bends.
  5. Pour bay by bay, keeping each new load against fresh concrete.

Faults That Break a Slab Pour

  • Long gap between trucks: the bay edge starts to set, and the next load lands against stiff concrete, leaving a cold joint through the slab depth.
  • Water added on site: the driver or crew adds water to a stiff load, the water-cement ratio rises, and the slab loses strength across the full bay.
  • Concrete dumped in one spot: the mix segregates, coarse aggregate collects at the edges, and the soffit shows honeycombing after striking.

Buyers placing ready mix concrete bulk orders should agree the grade, slump range, truck interval and cube schedule with the plant in writing, and those comparing rmc suppliers in lucknow can use delivery timing and site support as the deciding factors. BTech Mart lists raw material suppliers on one platform,

Curing Starts When the Pour Ends

A slab that has been poured well can still lose strength if curing starts late. Curing should begin as soon as the surface can take water without damage, and it should continue without a gap until the slab has gained enough strength to hold its own moisture. Where ponding is not possible, wet hessian or gunny bags kept damp do the same work, provided someone is assigned to wet them on schedule and the covers are not left to dry out between rounds.

The curing record belongs with the pour record. If a cube result comes back low later, the curing record is the first document the engineer reaches for, because it shows whether the slab was given the water it needed. A slab that was cured on time and a cube that was cured in the tank can then be compared fairly, and the reason for a low result can be traced instead of guessed at. The curing record is kept with the pour file, beside the cube register and the delivery challans.

  • Ponding: hold shallow water on the slab with a mortar bund where the edges allow it.
  • Wet covers: keep hessian or gunny bags damp at all times, with a named person on the duty.
  • Timing: start curing as soon as the surface can take water without damage.
  • Record: note the start time, the method and the person responsible beside the pour record.

FAQs

What is a cold joint in a concrete slab?

A cold joint is a weak plane that forms when placed concrete begins to set before the next load arrives against it.

How is slump checked on site?

The technician fills a slump cone with concrete from the truck, lifts the cone and measures how far the concrete settles.

Can water be added to RMC on site?

No, water should not be added to a stiff load on site.

Why are cubes cast during a pour?

Cubes are cast to test the compressive strength of the concrete at 7 and 28 days.

When can formwork be struck after a slab pour?

Formwork striking follows the period given in the specification for the span and the member type.

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