In brief
- When nobody records the batch, the mix proportions on a Borama site can drift from the specification without anyone noticing until cores or cube results come back.
- Ask the municipal engineer's office what the project approval requires and whether it holds records for the plot, then match the batching sheets against the specification before the next pour.
- A supervisor's presence on site is not the same as tested concrete. Witness the batching, keep the sheets, and confirm acceptance criteria with the project engineer.
Contents
Weak supervision of concrete batching in Borama rarely shows up as one dramatic failure. It shows up as a mix that drifts from the specification pour by pour, because no one is measuring and recording what goes into the drum. The gap sits in the routine: who counts the cement bags, who watches the water, and who signs the batching sheet.
Who is supposed to supervise batching?
The answer depends on the appointment, not the job title. Check the contract, the specification and the appointment letters together, and ask the project engineer to confirm in writing who checks batching, what record is kept, and what happens if the record is missing. If those lines are blank, the gap is already open.
Ask the municipal engineer's office what the building approval requires for inspection and record keeping, and whether the office holds any site records for the plot. Then compare the two answers against what happens at the mixer.
A supervisor who stands near the mixer but never checks a bag count, a water container or a moisture reading is not supervising batching. That is attendance, and it leaves the concrete unverified.
How does weak supervision change the concrete?
Concrete strength depends on the cement, water, aggregate and admixture proportions actually used, and on how they are combined. Small drift across many batches adds up. Extra water for workability raises the water-cement ratio; too much sand and too little coarse aggregate leaves a mortar-rich mix that shrinks and cracks.
Because the mix changes from batch to batch, the finished element is not uniform. A column cast on Monday can differ from the same column cast on Thursday. Results from one cube or core then say little about the rest of the pour, which is the missed-inspection risk.
On a Borama site, ask what governs the proportions: a specification mix, a trial mix, or an on-site decision. If it is on-site, who made it and on what basis? Confirm the acceptance criteria with the project engineer rather than relying on a general rule of thumb. Keep the batching sheets, delivery notes and any test results together, so the evidence follows the pour.
How do you detect the gap before a pour?
Stand at the mixer during the next pour and watch the loading. Check that each material is measured by a defined method, and that the measured quantities match the specified proportions. Confirm the measuring method with the project engineer, and check whether the water is adjusted for how wet the sand is. Look at the batching record: if the daily figures are identical, ask whether the quantities were actually measured and request the measurement records behind the sheet.
Walk a recent site with the same contractor and ask to see the same records. Compare the concrete in place against the specification: cover, finish, cracking, and honeycombing around forms. Then read the cube or core results if any exist, and ask who took the samples and when.
If the records do not exist, the practical route is a fresh test programme agreed with the project engineer, before more concrete goes in.
What to do next
Before the next pour, send the contractor a written list of the batching records you want to see, and ask the project engineer to confirm the mix proportions and acceptance criteria in writing. Then stand at the mixer for one full load and compare it against that list. Keep every sheet.
Frequently asked questions
Can I test concrete after it has hardened?
Yes. Cores can be taken from hardened concrete and tested, but the result applies mainly to the location drilled. A testing laboratory can explain the method and the limits, and the project engineer should confirm whether cores are acceptable as evidence.
What records should a batching supervisor keep?
A batching sheet for each pour showing the cement, sand, coarse aggregate, water and any admixture used, the time of the pour, and the element cast. Delivery notes for cement and aggregate should sit with it. Ask the project engineer to confirm the exact format required.
Local reporting: this article is written for building work in Borama and Somaliland. Ground conditions, prices and rules differ between places; confirm the details for your own site.