Most failed pours are not caused by bad concrete or a faulty pump. They are caused by timing, when a mixer truck arrives before the pump is set up, or the pump sits primed and idle while the next load is 40 minutes away.
Getting the two to line up is the whole job. Easypump Concrete Ltd supplies ready mix, volumetric concrete and pump hire together for this reason, and this guide covers how the sequencing works and where it goes wrong.
Why Timing Matters More Than Anything Else on Pour Day
Concrete starts hydrating the moment water hits cement. In UK conditions you generally have around 90 to 120 minutes from batching to placement, and less in warm weather or with an accelerated mix.
That window is the constraint everything else fits inside. Truck travel, waiting time, pump setup and the pour all draw from the same clock, so a 30 minute delay at the kerb comes straight out of your placing time.
The cost of getting it wrong shows up in three ways:
- Waiting time charges from both the concrete supplier and the pump operator
- Cold joints where one load stiffens before the next arrives, weakening the slab
- Rejected loads if concrete goes past its usable window and has to be sent back and paid for
The Correct Order of Events
The sequence is simple, but it only works if the pump stays ahead of the concrete. The crew should arrive first, set up, and be primed and waiting when the first truck pulls in.
Easypump Concrete Ltd normally books the pump 30 to 45 minutes ahead of the first delivery slot for this reason. On a complex setup, running hose through a house or over a roof, that gap stretches to an hour.
A standard domestic pour runs like this:
- Pump arrives, positions and runs out the hose line
- Line is primed with grout so the first concrete does not block
- First mixer truck arrives and discharges into the hopper
- Pouring starts, with your team levelling and finishing behind the hose
- Subsequent loads arrive on a staggered call off
- Final load placed, line washed out, pump packed down
How Load Staggering Actually Works
You do not want every truck arriving at once. Three mixers queued on a residential street is a parking problem, a neighbour problem, and a concrete problem, because the last one in the queue is ageing while it waits.
The right gap depends on how fast the pump clears a load and how fast your team finishes behind it. A line pump moving 15 to 20 cubic metres per hour clears a 6m³ load in 20 to 25 minutes, so loads are usually called off at 30 to 40 minute intervals.
Two things change that spacing:
- Finishing rate. If two people are tamping a large slab, the pump has to wait for them, not the other way round. Space the loads wider.
- Access. A single parking bay means one truck at a time, so the next load should leave the plant only once the first is discharging.
Volumetric concrete removes most of this problem entirely. The mix is batched on site as you pour, so there is no queue, no staggering and no ageing load standing on the road.
Where Coordinating Concrete Pump Usually Breaks Down
Most delays trace back to a few predictable causes, nearly all avoidable with a phone call the day before. The most common is a site that is not ready when the concrete arrives, with formwork half finished or reinforcement still being tied.
The second most common is a booking split across two suppliers who never spoke to each other. The concrete company has a 9am slot, the pump company has a 9am slot, and nobody accounted for the setup time in between.
Watch for these:
- Formwork, DPM or reinforcement not signed off before the truck is called
- No parking bay reserved, so the pump cannot get near the property
- The supplier not told the concrete is being pumped, so slump and aggregate are wrong
- Volume underestimated, leaving you short and waiting on an unplanned extra load
- Not enough labour on site to finish at the pump’s rate
- Skips, scaffolding or a block delivery parked in the setup area
- No washout point agreed, holding the pump on site after the pour
Booking Concrete and Pump From the Same Supplier
When one company controls both, the coordination problem largely disappears. Easypump Concrete Ltd schedules the pump and the concrete against the same job sheet, so the setup gap is built into the booking rather than being your job to work out.
It also removes the blame gap. If two suppliers are involved and something slips, each one bills for waiting time and points at the other. With a single booking there is one point of contact, one schedule and one number to call.
What single sourcing gives you in practice:
- Pump arrival time set relative to the first delivery, not booked blind
- Mix specified for pumping from the start, with correct slump and aggregate
- Load call off managed live against how fast the pour is actually going
- One number to call if access changes or the pour runs long
Preparing the Site So the Schedule Holds
The schedule only holds if the site is ready. Everything below belongs to the day before, not pour morning, because anything left over becomes waiting time on someone’s invoice.
Send access photos or a short video when you book. A 20 second clip of the route from the road to the pour area tells the pump crew more about setup than a paragraph of description ever will.
Ready before the first truck arrives:
- Formwork, DPM, insulation and reinforcement complete and checked
- Parking bay reserved for the pump, plus standing space for the mixer truck
- Hose route cleared of tools, materials and vegetation
- Volume calculated with 5 to 10 percent added for over dig
- Mix and any admixtures confirmed with the supplier
- Enough labour on site to level, tamp and finish continuously
- Washout area agreed and water available
- Neighbours warned if the street will be partly blocked
Weather, Traffic and the Things You Cannot Control
Some variables sit outside anyone’s control but can still be planned around. Traffic into London and around the M25 is the main one, which is why early slots are worth booking even though they fill first.
Weather changes the working window in both directions. Warm, dry conditions shorten it and may call for a retarder, while cold weather slows the set and can push finishing hours later than planned. Frost is the hard stop, since concrete should not be placed onto frozen ground.
Build a buffer into the plan rather than assuming a perfect day:
- Book the earliest slot available for large pours
- Agree a wet weather cut off with your supplier in advance
- Have covers and protection on site for a sudden change
- Keep the pump operator’s number on you, not just in the office
Frequently Asked Questions
How far ahead of the concrete should the pump arrive?
Usually 30 to 45 minutes for a straightforward domestic setup, and up to an hour where hose is being run through a building or over a roof.
How long can concrete sit in the truck before it is unusable?
Generally around 90 to 120 minutes from batching, shorter in warm weather or with an accelerated mix. This is why staggered call off matters.
Can I book the pump and concrete separately?
You can, but you take on the coordination and the risk of waiting time charges from both. Easypump Concrete Ltd books them together against one schedule.
What happens if my site is not ready when the truck arrives?
Waiting time is usually chargeable, and if the delay is long enough the load can become unusable. A quick call to push the slot back is always cheaper than a rejected load.
Do I still need staggered deliveries with volumetric concrete?
No. Volumetric concrete is mixed on site as you pour, so there is no queue of trucks and no load ageing on the road while it waits.
Getting Your Pour Booked Properly
The pour that runs smoothly is the one where the pump is primed before the first truck arrives, loads are called off against the real pace of the job, and nobody is standing around. That is a scheduling decision, made when you book rather than on the morning.
Easypump Concrete Ltd supplies ready mix, volumetric and onsite mixed concrete with line and boom pump hire across London, Hertfordshire, Bedfordshire, Buckinghamshire, Essex and Northampton from its Hatfield base.
Call 01582 550287 or email admin@easypump.co.uk with your site address, pour date, estimated volume and an access photo, and we will set the pump and delivery times against one schedule.
Easypump Concrete Ltd 165 Parkhouse Ct, Hatfield AL10 9RD 01582 550287 | admin@easypump.co.uk