By BuildSupply Editorial Team
Concrete aggregate orders should translate an approved concrete requirement into a clear ballast enquiry, with the purchasing unit and delivery evidence agreed in writing. Do not turn a general calculator output into a concrete mix design or assume that every lorry carries the same quantity. Keep material specification, estimated requirement, quoted load description and accepted delivery as separate parts of the record.
Concrete aggregate orders: identify the aggregate being requested
Ask the responsible engineer or concrete specialist to define the aggregate requirement for the actual work. The buyer needs the specified material description and any required evidence, not an improvised recipe from a general building guide. BuildSupply’s catalogue includes ballast, also called kokoto. This guide does not represent the store as supplying a complete concrete package, cement, reinforcement or a concrete placement service.
State the particular work package in the enquiry and identify the current approved specification. Different operations on one project may have different requirements. Do not combine them into a single ballast total until the technical team has confirmed that the same material description applies. If a supplier proposes an alternative, refer the details to the authorised reviewer. A delivery described as available sooner or at a lower rate is not automatically suitable for the specified work. Keep the decision and supporting evidence connected to the order line.
Concrete aggregate orders: check the connection between measured and purchased quantities
Retain the unit used in the approved BOQ and show the supplier's purchasing unit in a separate column. If the two differ, ask the responsible quantity reviewer to explain the bridge between them. A material described per piece, foot, length or load cannot be treated as interchangeable merely because the descriptions refer to the same project. The conversion needs a stated basis that the buyer can repeat.
Distinguish a theoretical net requirement from the quantity proposed for ordering. The net calculation describes the measured work under its assumptions. Cutting, handling or contingency allowances are separate purchasing decisions and should retain their reasons and approvals. Check whether an allowance is already included in the source schedule before adding another. Otherwise a well-intended precaution may duplicate a quantity already allowed by the project team.
Record measurements at a useful level of detail. Total footage can hide an unsuitable length mix, and a total piece count can hide differences in size. Similarly, an assumed volume does not prove a delivered mass. Identify the dimensions, length classes or delivery evidence relevant to the agreed sales unit. Do not invent a conversion factor or rely on appearance to settle a quantity that requires measurement or supporting documentation.
Make every conversion and allowance visible
Round only after understanding the unit in which the supplier actually offers the material. An internal calculation can produce a fractional figure, while the quotation may use whole pieces or another agreed increment. Show the unrounded calculation and the purchasing decision separately. Ask the supplier to confirm the commercial measurement basis. A neat rounded total should not conceal a change in specification or an assumption about stock that has not been confirmed.
Use a worked example to test the schedule before approval. Choose one representative line, reproduce its calculation and ask a second reviewer to follow the assumptions. If the results differ, compare inputs and units before changing the order quantity. The objective is not to force agreement with an existing spreadsheet. It is to understand why the calculation describes the approved work and whether it maps to a feasible purchase.
Keep the same unit labels on the receiving record and closing reconciliation. A count made using a different basis from the order may look like a shortage even when the underlying quantities have not yet been compared correctly. Resolve the unit question first and retain the explanation. This makes later payment, balance and variation discussions more accurate without pretending that an estimating worksheet is a structural design or a supplier's delivery certificate.
Concrete aggregate orders: test mass and volume assumptions
Suppose a hypothetical approved schedule requires 54 tonnes of a specified aggregate. If an offer describes an 18-tonne load, three such quoted loads would arithmetically total 54 tonnes. That calculation is valid only if the quantity basis is agreed and evidenced. The name of a catalogue load does not itself prove what was delivered on a particular trip. Ask what documentation and receiving process will establish the order quantity.
Now suppose another offer is expressed in cubic metres. You cannot compare it directly with 54 tonnes without a justified density and measurement basis for the actual material and condition. Do not insert a generic conversion merely to complete a comparison table. Record the unresolved conversion and ask the responsible quantity reviewer and supplier to clarify it. This keeps an apparent price difference from being mistaken for a saving when the offers describe different quantities. The worked numbers are examples, not a statement about BuildSupply’s loaded vehicles or stock.
Concrete aggregate orders: tie the release to readiness for the operation
Before arranging a delivery, ask the contractor to confirm when the aggregate is actually needed and where it will be received. A concrete operation may depend on approved temporary works, labour, access and other materials sourced separately. Buying aggregate early does not establish that the rest of the operation is ready. The project’s competent team must decide the technical sequence and readiness requirements.
Use the proposed programme to identify a release window, then obtain the supplier’s response. An internal pour date is a request, not a confirmed delivery promise. If the programme changes, review the current order before requesting another load. Stock already accepted may still cover part of the next operation, provided it matches the approved requirement and condition. Keep the supplier’s commercial timing separate from the project team’s decision to proceed with the concrete work. This prevents a purchasing message from being treated as an authorisation for a safety-critical activity.
Concrete aggregate orders: prepare acceptance checks before the load arrives
Prepare the receiving sheet from the actual order, using the same material descriptions and units. Include the expected quantity, delivery note reference, person checking and space for exceptions. A form written before arrival helps the team check the agreed requirement rather than reconstruct it from the load. Where a measurement or document is required, arrange for a competent person and suitable equipment to be available at the receiving point.
Name the person who may acknowledge arrival and the person who may accept the material. Those responsibilities may belong to different people. A gate contact can confirm that a vehicle arrived without having authority to accept a specification difference. Explain how the contact should reach the authorised reviewer if something is unclear. The driver should not have to negotiate an improvised acceptance process with several people giving conflicting instructions.
Record physically received, accepted and held quantities separately. If a delivery contains material awaiting review, show that it is present without counting it as cleared for use. Keep it identifiable while the issue is resolved. The outstanding order balance depends on the agreed contract and the eventual acceptance decision. Do not hide an exception by simply adjusting a total until it matches the delivery note or the original purchase quantity.
Separate physical receipt from acceptance
Use photographs as supporting evidence, with a reference that connects them to the order line and date. Where dimensions are disputed, record the agreed measurement method as well as the result. A photograph without scale or context cannot establish every material property. Similarly, a visual inspection cannot replace a specified technical test or certificate. Label the type of check performed so the record does not imply more assurance than was actually obtained.
When a difference is found, describe the observation rather than assigning blame. Identify the affected quantity, requirement and evidence, then follow the agreed review route. Confirm who will respond and how the held material should be managed in the meantime. This guide does not establish a supplier replacement, return or refund promise. Those remedies must come from the applicable quotation, order or other agreed terms.
After acceptance, update the stock register promptly and attach the receiving evidence. Make sure the team that issues materials knows which batch is available and which remains on hold. A clear handover reduces the chance of disputed material being mixed into accepted stock. At the next release review, reconcile the register with what is physically present, rather than relying on a dispatch message as proof that the previous order was completed.
Concrete aggregate orders: keep receiving bays and quantity records distinguishable
Plan the receiving position so the site team can maintain the identification required by the specification. If different aggregate requirements are present, ask the supervisor how they will remain distinguishable. The procurement record should identify the intended bay or material reference, but it cannot determine a safe traffic arrangement, stockpile geometry or ground capacity. Those details need competent site assessment.
Record each trip separately, with the order line, vehicle or delivery reference, agreed quantity evidence and acceptance outcome. A project total is useful only after those individual records can be reconciled. Concrete aggregate orders should show where a claimed quantity came from and whether it was accepted, rather than relying on a photograph of a pile. If an inspection or documentation issue remains open, preserve the evidence and follow the agreed review process. Do not adjust the tonnage or volume to a convenient number simply because several trips were expected to complete the requirement.
Concrete aggregate orders: review the decision before release
For the first proposed aggregate delivery, prepare the evidence route in advance: the quoted sales unit, the document or measurement expected, the receiving contact and the person who can resolve a discrepancy. Ask the team what it will do if that evidence is absent or unclear. Record the agreed response without assuming a refund or replacement. A receiving procedure that cannot explain the quantity basis before arrival is unlikely to become clearer merely because a loaded vehicle is waiting at the gate.
Next steps for concrete aggregate orders
Prepare concrete aggregate orders with the approved material requirement, clear purchasing units and proposed release window. Ask BuildSupply to explain the quoted load description and evidence, and confirm destination feasibility and delivery responsibilities. Use the quantity calculator only with reviewed assumptions, and leave concrete mix and structural decisions to the responsible qualified professional.
Catalogue and buying resources
Use these catalogue entries to identify the exact lines for your enquiry. Confirm their current specification and purchasing unit in the quote:
- Ballast – Per 18 Tonne Lorry — listed purchasing unit: lorry.
- Kokoto – 17 Tonne Lorry — listed purchasing unit: lorry.
Browse the relevant ranges: Ballast.
Set out the work package on the concrete materials page and send the approved schedule with a bulk quotation enquiry. Ask the supplier to confirm feasibility, timing and commercial terms for your actual destination.
For the supporting buying process, read Building material quote comparison: find the true delivered cost, and Stone quantity estimates: reconcile wall area and purchase units.
Check the input assumptions with your project adviser before using the ballast quantity calculator. A calculation does not confirm a vehicle’s delivered quantity.
Frequently asked questions
Does an 18-tonne product name prove every delivery weighs 18 tonnes?
No. Confirm the agreed quantity evidence for the actual delivery and reconcile it with the order rather than relying on the listing name alone.
Can I convert tonnes to cubic metres with one universal factor?
Do not assume a universal factor. Use a justified basis for the actual material and condition, reviewed by the responsible quantity professional.
Does this guide provide a concrete mix ratio?
No. The project’s responsible engineer or concrete specialist must specify the concrete and aggregate requirements for the intended work.
What does kokoto mean in this enquiry?
The term is used here for ballast. Keep the approved material description and purchasing unit explicit even where local terminology is familiar.
Should a change in the pour date trigger a fresh ballast order?
First review existing accepted stock, the approved requirement and the current order. A revised programme does not automatically mean another full load is required.
What should each trip record include?
Include the order line, delivery reference, agreed quantity evidence, receiving date and acceptance outcome, with any exception clearly identified.
References
Official background resources for the relevant procurement, weather or wood-care questions discussed above. They do not certify a catalogue item or confirm this supplier’s terms.
