In Plain English
Quick Answer
A machine that pumps liquid concrete through a hose or boom to reach places a concrete truck can't directly discharge.
Definition
Definition
A mechanical device that transfers liquid concrete from the truck mixer to the point of placement through a system of pipes or a boom arm, used when direct discharge from the truck is not practical. Boom pumps mount on trucks with a folding articulating arm that can reach over or around obstacles. Line pumps use flexible hoses to reach more confined areas. Pumping requires a mix design with adequate slump and workability.
Context
Why It Matters in Bidding
Pumping is often a separate cost the concrete sub or GC must carry, and forgetting it on a bid can wipe out the pour's margin. Estimators decide between a boom pump and a line pump based on access, reach, and pour volume, then price mobilization plus an hourly or per-yard rate. Pump availability and the required pumpable mix design also affect scheduling and the concrete spec.
Example
Example
Facing a basement slab with no truck access, an estimator prices a boom pump with a four-hour minimum plus mobilization, adds it as a distinct line item in the concrete scope, and confirms the mix design carries enough slump to pump without segregating.
See Also
Related Terms
FAQ
Questions Contractors Ask
When should a bid include a concrete pump?
Whenever trucks cannot discharge directly at the placement point, such as elevated decks, interior slabs, tight sites, or pours over obstacles. Estimators flag access constraints during the site review and the takeoff, then add pumping as a separate cost rather than assuming chute placement that the site geometry will not allow.
Boom pump or line pump, which is cheaper to bid?
Line pumps generally cost less per pour and suit smaller or confined placements, while boom pumps cost more but place large volumes fast and reach over obstacles. The right choice depends on volume, reach, and access. Estimators weigh the equipment rate against labor savings from faster placement when selecting.
How is concrete pumping priced in an estimate?
Pumping is typically quoted with a mobilization or setup charge plus an hourly rate or per-cubic-yard rate, often with a minimum. Estimators get a quote from the pumping vendor or include the sub's pumping line, then add it to the placement scope separate from the ready-mix material cost.
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