Plan, schedule, and execute ready-mix concrete deliveries with confidence
Everything you need to plan a successful concrete delivery and pour in 2026 — from ordering and site preparation to truck scheduling, weather risks, compaction, and curing. Covers BS 8500, UK standards, and best practice for all pour types.
Professional guidance for ready-mix concrete delivery planning, site preparation, and successful pour execution on any project
Accurate volume calculation is the foundation of every successful concrete delivery. Over-ordering wastes money; under-ordering causes cold joints and structural weaknesses. Use the formula: Volume (m³) = Length × Width × Depth, then add a 5–10% wastage allowance. Always confirm your mix specification (e.g. C25/30, C30/37) with your supplier to BS 8500 requirements before placing the order.
A ready-mix truck arriving at an unprepared site is one of the most costly mistakes in construction. Formwork must be set, checked, and braced before the truck leaves the batching plant. Access routes, pump positions, and discharge points must all be confirmed. Concrete begins to set from the moment it is batched — typically you have 90 minutes from batching to discharge under BS EN 206.
UK weather is unpredictable and has a direct impact on concrete workability, setting time, and long-term strength. Pouring below 5°C without protection risks frost damage; pouring above 30°C accelerates setting and risks plastic shrinkage cracking. Always check the forecast 48 hours ahead, have contingency materials ready (insulating blankets, shade covers), and factor seasonal adjustments into your pour schedule for 2026.
Every stage must be completed in sequence — skipping any step risks structural failure or project delays.
Before contacting any supplier, you must have an accurate concrete volume calculation. Ready-mix concrete is ordered in cubic metres (m³) and suppliers typically have a minimum order quantity — commonly 0.5 m³ to 1 m³ for standard drum trucks. For very small volumes, mini-mix suppliers can deliver from 0.1 m³, which is ideal for domestic footings, post holes, and repair work.
For irregular shapes, break the area into rectangles, calculate each volume separately, and sum them. For sloped slabs, use the average depth. Always round your final order up — never down. Running out of concrete mid-pour forces a cold joint, which is a structural weakness and a Concrete Society non-compliance issue.
A full-size ready-mix drum truck carries 6–8 m³ of concrete. For large pours requiring multiple trucks, plan staggered arrival times of 20–30 minutes to maintain a continuous pour without cold joints forming between loads.
Under BS EN 206, ready-mix concrete must be fully discharged within 90 minutes of batching (or before the drum has completed 300 revolutions). In hot weather this window reduces significantly — always factor this into truck scheduling.
Add 5% for simple slabs and walls. Add 7.5–10% for foundations with irregular ground, complex formwork, or pump delivery. For reinforced elements, add 10% as rebar and spacers displace volume.
Ordering the wrong mix is as costly as ordering the wrong volume. In the UK, concrete mixes are specified to BS 8500-1:2023 and BS EN 206. You must provide your supplier with the correct Designated Mix or Designed Mix reference. The most common designated mixes for different applications are shown below.
| Mix Designation | Strength Class | Typical Application | Min. Cement Content | Max. w/c Ratio |
|---|---|---|---|---|
| GEN 1 | C8/10 | Mass concrete fill, blinding layers | 180 kg/m³ | 0.80 |
| GEN 3 | C16/20 | Kerb bedding, domestic footings | 240 kg/m³ | 0.70 |
| RC25/30 | C25/30 | Reinforced slabs, beams, columns | 280 kg/m³ | 0.60 |
| RC28/35 | C28/35 | Reinforced foundations, retaining walls | 300 kg/m³ | 0.55 |
| RC32/40 | C32/40 | Heavy-duty slabs, bridge decks | 320 kg/m³ | 0.50 |
| FND 2 | C25/30 | Foundations in Class 2 sulfate ground | 300 kg/m³ | 0.55 |
| FND 4 | C32/40 | Foundations in Class 4 sulfate ground | 340 kg/m³ | 0.45 |
Site preparation must be fully complete before the first truck is booked. Any delay at site after the truck arrives wastes the 90-minute discharge window and risks the concrete stiffening in the drum. The following checklist covers all critical pre-pour preparation tasks for a standard UK concrete pour in 2026.
For large pours requiring multiple trucks, scheduling is critical. If trucks arrive too close together, concrete backs up and the pour becomes unmanageable. If they arrive too far apart, the previously placed concrete begins to set, creating a cold joint. The ideal interval between trucks depends on your pour rate and site conditions.
| Delivery Method | Typical Pour Rate | Truck Interval (6m³ load) | Best For |
|---|---|---|---|
| Direct Chute | 4–8 m³/hr | 45–90 mins | Footings, strip foundations, accessible slabs |
| Concrete Pump | 15–40 m³/hr | 10–24 mins | Large slabs, elevated structures, tight access sites |
| Skip & Crane | 3–6 m³/hr | 60–120 mins | Columns, walls, restricted areas |
| Wheelbarrow | 1–3 m³/hr | 120–360 mins | Very small pours, domestic, inaccessible areas |
| Conveyor Belt | 10–25 m³/hr | 15–36 mins | Long-distance horizontal placement, road works |
A cold joint forms when fresh concrete is placed against partially set concrete. In structural elements this creates a plane of weakness and potential water ingress. If there is a gap of more than 45–60 minutes between pours into the same element (in normal UK temperatures), treat the surface as a construction joint — clean it, apply bonding agent, and take structural advice before proceeding.
Weather is one of the most significant variables in concrete delivery and pour planning in the UK. Both hot and cold conditions affect workability, setting time, and final strength. In 2026, UK construction sites must plan around increasingly variable weather patterns when scheduling pours.
Concrete must not be placed when air or ground temperature is below 2°C without protection measures. At 5°C, hydration slows significantly — use accelerating admixtures, heated water, or insulated formwork. Cover poured concrete immediately with insulating blankets. Minimum concrete temperature at point of delivery: 10°C to BS 8500.
High temperatures accelerate cement hydration and increase water evaporation, reducing workability rapidly. Add a retarding admixture to extend workability. Pour early morning to avoid peak heat. Keep aggregate stockpiles shaded and use chilled water if available. Plastic shrinkage cracking risk increases significantly above 30°C.
Light rain has minimal effect on a concrete pour already in progress. Heavy rain can add uncontrolled water to the mix, raising the water-cement ratio and reducing strength. Do not add water to the mix on site regardless of conditions. If very heavy rain begins during a pour, protect the fresh surface with polythene sheeting and pause the pour if necessary.
| Temperature Condition | Effect on Concrete | Recommended Action | BS 8500 / CIRIA Guidance |
|---|---|---|---|
| Below 2°C | Hydration stops; freeze risk to fresh concrete | Do not pour without full frost protection regime | CIRIA C660 cold weather guidance |
| 2°C to 5°C | Very slow setting, frost risk overnight | Insulating blankets, accelerator admixture, warm sub-base | BS 8500-1 Cl. 7.3 |
| 5°C to 20°C | Ideal UK pouring temperature range | Normal pour — standard curing procedures | Standard BS EN 206 conditions |
| 20°C to 30°C | Faster setting, reduced workability window | Retarder admixture, early morning pour, wet curing | Reduce 90-min window to 60 mins |
| Above 30°C | Rapid set, plastic shrinkage cracking risk | Chilled water, shade aggregates, wind breaks, mist spray | CIRIA hot weather concreting guide |
Vibration is essential for removing entrapped air voids, consolidating the mix around reinforcement, and ensuring full contact with formwork faces. Poor vibration is one of the leading causes of honeycombing — a defect that reduces structural strength and durability, and can require expensive repair or demolition and re-pour.
Curing is the process of maintaining adequate moisture and temperature in fresh concrete to allow full cement hydration and strength gain. It begins immediately after finishing and is one of the most commonly neglected stages on UK construction sites. Inadequate curing is a leading cause of early-age cracking, surface dusting, and long-term strength deficiency in concrete structures.
Apply wet hessian or damp sand immediately after finishing, then cover with polythene sheeting to retain moisture. Maintain for a minimum of 3 days for OPC mixes (7 days for GGBS or PFA mixes). Re-wet if the hessian dries out. Most reliable curing method for UK conditions.
Spray-applied curing compounds form a thin film that retains surface moisture. Apply immediately after finishing while the surface is still wet. Ensure 100% coverage — missed patches will develop surface defects. Suitable for large horizontal slabs where wet curing is impractical.
Leaving formwork in place is an effective curing method for vertical elements. Minimum striking times: side forms to beams/columns — 9 hours at 10°C; soffit forms — 8–14 days depending on span and temperature. Never strike early to rush programme.
The principal UK complementary standard to BS EN 206 covering concrete specification, including designated mixes, designed mixes, prescribed mixes, and standardised prescribed mixes for all exposure classes.
BSI Standards →Leading UK technical authority on concrete construction. Publishes technical guidance including TR34 (industrial floors), TR66 (early-age thermal crack control), and cold weather concreting guidance referenced throughout this guide.
Concrete Society →CIRIA publications C660 and C766 provide detailed guidance on controlling early-age thermal cracking and concreting in extreme UK weather conditions — essential references for pour planning in 2026.
CIRIA Publications →