What to check before a ready-mix concrete delivery arrives

Pouring concrete is a race against the clock. Once the truck is on site, the mix has a working window measured in minutes, not hours. A missed detail in preparation can mean a rejected load, a weak slab, or a pour that has to stop halfway. The difference between a smooth pour and a costly delay usually comes down to what you checked before the truck left the plant.

Ready-mix suppliers run to tight schedules. When a truck leaves the yard, the clock starts ticking on the mix chemistry and on the driver's route. A planned delivery for concrete pours depends on the site being ready the moment the chute swings into position. Below are the key points to confirm before you call for that first load. planned delivery for concrete pours

Confirm the mix and the volume

Ordering the right grade of concrete sounds simple, but it is worth double-checking the paperwork against the job. A C10 mix suits blinding and light domestic work. C30 is the standard for garage bases, driveways and general foundations. C40 handles heavier structural loads. If the wrong grade arrives, the pour becomes a problem. Check the order confirmation against the specification on your drawings or your structural engineer's note.

Volume is just as critical. Order too little and you are left with a partial pour and a cold joint. Order too much and you pay for material you cannot use. Most suppliers will let you add a small surplus if you ask, but they will not take back what is left in the drum. Measure the area, calculate the cubic metres, and add a small buffer if the ground is uneven or the formwork might bulge.

Site access and vehicle clearance

A concrete truck is a large, heavy vehicle. It needs a clear route from the road to the pouring area. Check for overhanging branches, low telephone cables, narrow gateways and soft ground. The driver will not risk getting stuck. If the truck cannot reach within chute length of the pour, you will need a pump or a barrow run, and that means extra time and labour.

Look at the turning circle at the end of the access road. A mixer drum cannot reverse far without the load becoming unstable. If the site is tight, arrange a turning point or agree on a reversing plan with the driver beforehand. For sites with very restricted access, consider a smaller truck or a volumetric mixer, but book that well ahead.

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The pouring area and formwork

The ground where the concrete will land must be ready. That means the sub-base is compacted, the formwork is braced and level, the reinforcement is in place, and the blinding layer (if needed) is down. Check that the formwork can hold the weight of wet concrete without bulging or bursting. A blowout mid-pour is messy and dangerous.

If the pour is on a slope, think about how the concrete will flow and where it might run to. Have a plan for stopping the pour if the ground shifts or the formwork moves. It is easier to pause and fix a problem than to dig out a half-set slab.

Wheelbarrow access

If the truck cannot reach every part of the pour, you will need wheelbarrows. Plan the route from the chute to the far corners of the slab. The ground should be firm enough to wheel a heavy barrow without sinking. Lay plywood or boards over soft spots. A wheelbarrow run that takes more than a couple of minutes per trip will slow the pour and risk the concrete stiffening before it is levelled.

Delivery time and traffic management

A planned delivery for concrete pours includes a precise arrival window. The driver will give an estimated time of arrival, but traffic, breakdowns and other jobs can shift that. Stay in touch with the dispatcher on the morning of the pour. If the site is on a busy road or a narrow lane, have someone manage traffic while the truck reverses in. Warn neighbours if the noise or the road blockage will affect them.

For large pours, stagger the deliveries so that the first load is almost placed before the second arrives. If all the trucks arrive at once, you create a bottleneck at the chute and the concrete in the later drums will have been waiting longer than it should. Talk to the supplier about a timed schedule and agree on a maximum wait time between loads.

Weather and ground conditions

Concrete does not care about the weather forecast, but you should. Rain on fresh concrete can wash the cement from the surface and leave a weak, dusty finish. Cover the pour with polythene sheeting if rain is likely. If the temperature is near freezing, the mix needs to be protected with insulation or accelerator, and the ground must not be frosty. Hot weather speeds up the set, so you will need to work faster or add a retarder to the mix. Ask the supplier for advice on the day's conditions.

Ground water is another hidden risk. If the excavation fills with water before the pour, the concrete will not bond properly and the slab may crack later. Pump out standing water and keep the sub-base dry until the concrete goes in.

Labour and tools

A pour needs enough hands. One person on the chute, one or two barrowing, one levelling and one finishing. Skimp on labour and the concrete will start to set before it is floated. Have a rake, a shovel, a straightedge, a bull float and a trowel ready. For large areas, a power float or a vibrating screed will save time and give a better finish.

Make sure someone on site knows how to handle a problem load. If the concrete arrives too stiff, do not add water on site without checking the supplier first. Too much water weakens the mix. A small amount of superplasticiser can adjust the workability without harming the strength. Keep a phone number for the dispatcher handy.

After the pour

Once the concrete is in place, the work is not over. Cover it to stop moisture loss, especially in wind or sun. Leave the formwork in place for the recommended time. Do not load the slab until the concrete has reached its design strength, which can take several days. A simple curing plan - keep it damp, keep it covered, keep traffic off - will protect the investment.

Stacey Concrete Ltd, based at Ryder Point Works, Wirksworth, Matlock DE4 4HE, UK, supplies ready-mix concrete grades C10, C30, C40 and more across the East Midlands and can be reached at +44 1629 825188.