How to Order Ready-Mix Concrete Without Missing a Requirement
A field-focused ready-mix ordering checklist covering strength, exposure, slump, aggregate, air, admixtures, placement rate, and delivery coordination.
Editorial review: 2026-09-29 · How we review technical content
Key takeaways
- A concrete order should translate the drawings and specifications into producer-ready requirements. Before calling the plant, identify the placement, specified compressive strength and test age, exposure class or durability requirements, maximum water-cementitious ratio when specified, air-entrainment requirement, nominal maximum aggregate size, slump or slump-flow requirement, and any limits on cementitious materials or admixtures. If the project is engineered, the concrete schedule and specifications govern over any generic residential rule of thumb.
- Provide the project address, estimated quantity, placement type, requested delivery rate, truck access limitations, discharge method, and the technical mixture requirements. Confirm whether the order is by producer-designated mixture or by prescriptive/performance requirements from the project specification. For a pump placement, coordinate aggregate size, hose size, line length, and any pumpability requirements with the producer and pump operator.
- Estimate net concrete volume from actual geometry and add a rational allowance for subgrade irregularity, form variation, spillage, and inaccessible leftovers. Excessive over-ordering is expensive, but an under-order can create a cold joint, finishing delay, or second short-load charge. For large placements, estimate the placement rate the crew can actually strike off, consolidate, finish, and cure; truck spacing should follow that rate.
Start with the project documents
A concrete order should translate the drawings and specifications into producer-ready requirements. Before calling the plant, identify the placement, specified compressive strength and test age, exposure class or durability requirements, maximum water-cementitious ratio when specified, air-entrainment requirement, nominal maximum aggregate size, slump or slump-flow requirement, and any limits on cementitious materials or admixtures. If the project is engineered, the concrete schedule and specifications govern over any generic residential rule of thumb.
The same PSI can describe mixtures that behave very differently in the field. Pumping, congested reinforcement, thin sections, hard-troweled floors, exterior broom finish, hot weather, and cold weather can each justify different workability or admixture decisions. Tell the producer how the concrete will be placed and finished rather than asking only for a strength number.
Information to give the producer
Provide the project address, estimated quantity, placement type, requested delivery rate, truck access limitations, discharge method, and the technical mixture requirements. Confirm whether the order is by producer-designated mixture or by prescriptive/performance requirements from the project specification. For a pump placement, coordinate aggregate size, hose size, line length, and any pumpability requirements with the producer and pump operator.
Discuss anticipated weather and travel time. Retarding, accelerating, water-reducing, or other admixtures should be selected through the producer and specification rather than improvised at the jobsite. If fibers are required, identify the fiber type and dosage from the project documents or product design—not merely “fiber concrete.”
Quantity and scheduling
Estimate net concrete volume from actual geometry and add a rational allowance for subgrade irregularity, form variation, spillage, and inaccessible leftovers. Excessive over-ordering is expensive, but an under-order can create a cold joint, finishing delay, or second short-load charge. For large placements, estimate the placement rate the crew can actually strike off, consolidate, finish, and cure; truck spacing should follow that rate.
Plan a place for washout before the first truck arrives. Verify access height, turning radius, ground bearing, overhead utilities, gate width, and whether backing assistance is needed. A good order is part material specification and part logistics plan.
At delivery
Check the batch ticket against the order before accepting the load. Record arrival, discharge, water added at the site when permitted, and any unusual conditions. Do not assume the driver can authorize changes that conflict with the approved mixture or project specification. If the load appears outside specification, involve the producer and project quality representative before placement.
If field testing is required, have the testing agency and sampling location ready. Samples should represent the concrete placed and be handled according to the applicable ASTM procedures. The batch ticket, field test data, specimen IDs, and placement location should be traceable to one another.
Common ordering failures
Frequent failures include ordering only by PSI, forgetting air entrainment for a qualifying exterior exposure, ordering a large aggregate for a thin or congested section, choosing a slump without considering placement method, and failing to coordinate truck rate with crew capacity. Another mistake is relying on added jobsite water to make an unsuitable mixture placeable.
For structural or specification work, use the approved mixture submittal and project requirements. The practical checklist here is intended to prevent omissions; it does not replace the mix-design approval process.
Field checklist
- Identify placement and specified strength.
- Confirm exposure, air, and water-cementitious requirements.
- Confirm slump/workability and placement method.
- Estimate quantity plus a rational allowance.
- Coordinate delivery rate, access, pump, testing, and washout.
References & further reading
- ACI SPEC-301-20 — Specifications for Concrete Construction — Specification framework for concrete construction.
- American Cement Association — Working with Concrete — General concrete construction and placement education.
- ACI SPEC-301-20 — Specifications for Concrete Construction — Reference specification used when incorporated into project specifications.