In brief
- A low slump testing bid usually leaves out something the test needs to happen: a working cone and tamping rod, travel to site, or someone to record results during the pour.
- Workability changes that go unrecorded during placing cannot be recovered later, because the concrete has already set.
- Ask for a priced method statement with the bid, so omitted items appear as gaps before the tender is awarded.
Contents
A low slump testing bid in Berbera usually leaves a cost out rather than doing the same work for less. The bidder may drop travel to site, standby during the pour, or the person who records results while concrete goes in. When any of these items disappears, the test is either rushed or never done, and undetected workability changes reach the formwork.
What does the bid leave out?
The priced items that vanish first are the ones nobody sees on pour day. A slump test needs a cone, a tamping rod, a clean level base, water for rinsing, and someone to take the sample from the middle of the load, not the first bucket. It also needs a person to write the result on a sheet while the pump or skip keeps moving. A bid that only counts the testing time has left out travel, loading and standby. That gap matters because a Berbera pour may start early to avoid the heat, so the tester waits on site with no other billable work. Ask each bidder for a method statement with the price, listing every item: equipment, transport, operator, technician, records and reporting. An item that is missing from the list is a cost the bidder has not priced.
How does that gap reach the concrete?
When standby and records are unpriced, the test is squeezed into the pour or skipped. Concrete placed in hot, dry and windy conditions can lose workability between the mixer and the formwork, so a mix that left the plant at the specified slump may arrive stiffer. If nobody tests and records at the point of placing, the gang may add water to keep it workable, or the pump operator may push through a stiff mix that bridges around steel. Both results are hidden by the time the formwork is struck. Confirm the sampling point with the project specification or the engineer, since the slump test belongs where the concrete is placed, not where it is loaded. Ask the batching plant for its delivery records and the testing laboratory for its worksheets, then compare the times against the pour log.
How do you catch it before award?
Compare bids on the same priced schedule, not on the bottom line. Send every bidder one method statement template and one bill of quantities line for each item: equipment, transport, technician time, standby, sampling, records and reporting. A bid that leaves standby or reporting blank is incomplete, and you can ask for it as a priced addition before award. Check that the testing laboratory can show current worksheets for slump tests it has done, and that its equipment list includes a cone with the right dimensions for the project specification. Ask the municipal engineer's office whether it holds any records from testing on nearby public work, and walk a recent site to see how tests were logged. Where the contract sets out testing frequency and hold points, check what it allows before you accept a reduced scope.
What to do next
Take the last low slump testing bid you received and mark every unpriced item: travel, standby, sampling, records and reporting. Send that list back to the bidder as a priced addition, and request the same from the other bidders. Award only against the completed schedule, then check the first pour log against the test worksheets.
Frequently asked questions
Should a slump test be done at the plant or at the point of placing?
General practice is to sample where the concrete is placed, because workability can change between loading and discharge. Confirm the sampling point and frequency against the project specification or the engineer's instruction.
How can a client check a testing laboratory before award?
Ask for recent slump test worksheets, the equipment list including the cone dimensions, and the name of the technician who will attend. Compare those worksheets against the pour logs from the same dates.
Local reporting: this article is written for building work in Berbera and Somaliland. Ground conditions, prices and rules differ between places; confirm the details for your own site.