Site preparation for concrete placing is the coordinated check that the work, people, materials, equipment, and records are ready before the first truck is discharged. Reinforcement and formwork are only part of the check. Access, weather, testing, curing, communication, and responsibility also have to be settled before concrete is ordered.
Use a pre-pour meeting and hold point
For a significant placement, hold a pre-pour meeting with the contractor, concrete supplier, testing agency, pump or placing crew, inspector, and relevant designers or consultants. The project specifications determine who must attend and who has authority to release the placement.
The release should be a clear hold point. Do not rely on a general statement that the area is ready. Record the checks, outstanding items, responsible person, and final acceptance before dispatch.
Pre-pour readiness checklist
| Area | What to verify | Evidence or hold point | Typical owner |
|---|---|---|---|
| Drawings and approvals | Latest approved drawings, mixture submittal, pour sequence, joint locations, embedded items, and approved changes. | Revision check and signed inspection record. | Contractor and inspector. |
| Subgrade or bearing surface | Line, level, compaction or bearing condition, drainage, cleanliness, frost, mud, standing water, and soft spots. | Survey, geotechnical acceptance, and visual inspection as required. | Earthworks team, geotechnical representative, and inspector. |
| Formwork and shores | Dimensions, alignment, stability, tightness, cleanliness, release agent, chamfers, blockouts, working platforms, and reshoring plan. | Formwork inspection and survey where specified. | Formwork contractor and competent inspector. |
| Reinforcement | Bar size, spacing, laps, couplers, anchorage, cover, supports, cleanliness, congestion, and stability during placement. | Reinforcement inspection and approved field changes. | Reinforcing contractor and inspector. |
| Embedded items | Anchor bolts, sleeves, conduits, waterstops, inserts, drains, openings, and monitoring devices are secured and coordinated. | Trade sign-off and location check. | Relevant trades and contractor. |
| Concrete supply | Correct mixture, quantity, delivery rate, truck access, backup plan, permitted adjustments, and communication with dispatch. | Order confirmation and pour schedule. | Contractor and producer. |
| Placement equipment | Pump setup, hose or chute reach, crane capacity if used, vibrators, backup vibrator, lighting, power, washout, and safe access. | Equipment check and exclusion-zone plan. | Placement contractor. |
| Testing and inspection | Sampling frequency, tests, specimen storage, technician access, acceptance limits, and action for nonconforming concrete. | Testing plan and laboratory confirmation. | Testing agency and inspector. |
| Weather and protection | Forecast, concrete temperature plan, wind, rain, heat, freezing risk, evaporation control, enclosures, and protection period. | Weather plan and required materials on site. | Contractor and producer. |
| Finishing and curing | Finish class, screed and finishing equipment, curing method, curing materials, joint cutting, protection, and access restrictions. | Method statement and materials physically available. | Finishing contractor. |
Foundation and slab preparation
Foundation excavation should reach the approved bearing material shown by the project documents. Loose material, mud, debris, ice, and standing water must be removed. Soft spots, over-excavation, and unexpected ground conditions require an approved disposition; they should not be filled with whatever material is available.
For slabs-on-ground, verify subgrade uniformity, elevations, granular layers, vapor retarder details, penetrations, and edge conditions. The required moisture condition depends on the specification and materials. The surface should not be muddy, frozen, or damaged by traffic before placement.
Construction joints
Construction joints must be located and detailed on approved documents. Their position depends on structural forces, member geometry, placement sequence, concrete supply, shrinkage, and project requirements. A generic rule such as always placing a joint where shear is minimum is not enough for every structure.
Before adjoining concrete is placed, prepare the existing surface as specified. Remove laitance and weak material, clean the surface, and provide the required moisture condition without leaving standing water. Reinforcement, waterstops, keys, and other load-transfer details must match the approved joint design.
Formwork, reinforcement, and embedded items
Formwork must support fresh-concrete pressure and construction loads while maintaining the required dimensions and tolerances. It should be stable, tight, clean, and treated with a compatible release agent. Formwork design and inspection are the responsibility of qualified persons under the project requirements.
Reinforcing steel must be the correct size and position, adequately supported, and free from substances that impair bond. Light surface rust is not treated the same as loose scale, oil, mud, or paint; acceptance follows the specification. Do not move bars to clear embedded items without an approved change.
Anchor bolts, conduits, sleeves, drains, waterstops, blockouts, and inserts should be secured so they cannot move during placement and vibration. Confirm that the placing route and vibrator can reach around congestion.
Do not order concrete before the curing plan is ready
Curing is part of placement preparation. Water, coverings, curing compound, protection, temperature-control materials, and labor must be available before discharge begins. The team should also know when finishing ends, when curing starts, who maintains it, and how early traffic or loading will be controlled.