Concrete Mix Quotes: Specify More Than Cubic Yards

Example: A contractor prices a driveway by cubic yard. The customer later expects reinforcement, testing, a pump, and a particular finish. The producer has a concrete order, but the crew and customer have different projects in mind.

A concrete quote needs to connect the specified mix with the work required to place, finish, protect, and accept it. Quantity is only one part of that agreement.

Establish what the concrete must do

Identify the use, loading, exposure, dimensions, thickness, base, reinforcement, joints, finish, and access. Where design documents or adopted requirements govern, name the controlling revision and assign required design or submittal review. Do not let a quote substitute an unsupported field choice for structural design.

ACI SPEC-301-20, Specifications for Concrete Construction, covers a broader construction specification than material quantity alone. Identify which project requirements actually apply rather than treating the publication as automatically binding on every patio.

Put the price in the concrete estimate and the technical basis in the scope attachment. Record, as applicable:

• Required strength and test age, exposure-related requirements, and approved mix identification.
• Slump or other workability requirements, air, aggregate, admixtures, color, and fibers.
• Reinforcement and support details, distinct from the concrete mix.
• Placement method, finishing, joints, curing, protection, and return-to-use criteria.
• Testing, inspection, acceptance, and responsibility for resolving nonconforming results.

A strength label alone does not explain all those decisions. The producer's order, accepted concrete bid, and crew instructions should describe the same requirements.

Calculate quantity from the actual scope

For an illustrative rectangular slab measuring 20 by 30 feet:

These are quantity examples, not recommended slab thicknesses. Account separately for thickened edges, steps, grade variation, verified base conditions, and justified ordering allowances. Say whether the price is a defined lump sum or adjusts under a stated measurement and approval rule.

If unsuitable base or concealed debris changes the job, document it before placing over it. The hidden-conditions guide explains that decision; the material reconciliation guide helps distinguish ordered, delivered, used, returned, and billable quantities.

Agree on delivery and adjustment before dispatch

ASTM C94/C94M-26a is the ready-mixed-concrete specification. Identify the edition and project ordering requirements that control the supply. Assign delivery spacing, waiting charges, access, pump or buggy work, washout, cancellation, and rejected-load handling in the actual agreement.

The concrete work order should name who releases trucks after forms, base, reinforcement, inspections, crew, access, tools, and protection are ready. A customer request does not automatically authorize a technical departure or an extra charge.

Slump describes concrete consistency under a defined test; it is not permission to add water without limits. NRMCA CIP 26, Jobsite Addition of Water, revised 2023, explains that permitted additions must remain within applicable slump and water-to-cementitious-material limits and be measured and recorded. Establish the authorized representative and producer/project procedure beforehand. Record water or admixture changes and their authorization on the delivery documentation.

Use a change order when a valid scope or commercial change needs approval. Keep contractor corrections and unsupported charges separate from customer additions.

Price testing, curing, and protection explicitly

Name who arranges and pays for required sampling, tests, specimen storage, laboratory work, and reporting. Identify the acceptance criteria and review path for an adverse result. ASTM C31/C31M-26a concerns making and curing field test specimens; the project must still specify the required tests and purpose. An exclusion in a quote does not remove mandatory testing or design obligations.

Curing is part of the work. NRMCA CIP 11, Curing In-Place Concrete, revised 2017, explains the role of moisture and temperature in developing the intended properties. Record the selected curing method, weather protection, responsible party, and applicable duration or release criterion. Do not promise vehicle access after one universal number of days.

Price demolition, cutting, slurry/washout, protection, and cleanup honestly. For covered construction silica exposure, OSHA 1926.1153 establishes task-specific controls or exposure-assessment requirements. The customer's acceptance of a quote does not replace the employer's controls.

Keep the pour record with the bill

Save mix and delivery tickets, placement locations, times, adjustments, tests, weather, curing, photographs, and exceptions with the daily report. Tie approved changes to the invoice.

At completion signoff, identify finished work, open items, care instructions, restrictions, and any pending test results. Do not describe pending acceptance as a completed pass.