In brief
- Curing cost omissions in Bosaso are usually not deliberate fraud but a bid built from a rate per cubic metre, not from the hours, water and cover the pour needs.
- A bid that names a water source, a curing duration and a person responsible is easier to compare than one that only gives a total.
- Ask to see the curing record from a recent Bosaso pour before you accept a low rate.
Contents
A low concrete rate in Bosaso often leaves out curing: the water, the labour to apply and replace it, and the cover that holds it. The pour gets priced, the curing does not. A bid priced per cubic metre can carry water, labour and cover without ever naming them, and it shows up months later as surface cracking, dusting and weak cover to the steel.
What does a curing bid actually leave out?
Curing costs money in three places: water, labour and protection. Water has to be bought or pumped, stored and carried to the pour, and in hot, dry, windy conditions it evaporates faster than a small crew can replace it. Labour has to wet hessian, sand or mats, keep them wet through the day, and return at night. Protection covers polythene sheeting, shading and the time to place and secure it. A bid priced per cubic metre can leave out all three without the total looking wrong. When a contractor strips them out to win the job, the site has no budget line for the person who keeps the concrete wet. Ask each bidder to list water source, application method, cover material and the hours per day for the curing period. Confirm the curing duration and method against the project specification or the engineer, since general practice varies with mix, element and weather.
How does the gap damage the concrete?
Curing holds water in the mix while cement hydrates. Stop the water and hydration stops near the surface, so the top layer stays weak and porous. That porous surface lets chlorides and sulphates into the cover concrete more easily, and the exposure conditions on your plot decide how much that matters. Confirm the exposure conditions with the project engineer before you settle the curing method. You may then see plastic shrinkage cracks, dusting underfoot, and a floor or slab that fails an abrasion or cover test. Ask for the curing record from a recent pour: times, water source, cover used and who signed it. Laboratory cube results do not prove curing happened on site, so ask for the site diary as well. Walk a recent job by the same contractor and look at the slab surface for cracks, dusting and patchy colour.
How do you close the gap before award?
The cheapest moment to fix a curing omission is before you sign. Put the curing method in the tender documents: water source, application, cover, duration and the person responsible. Require a daily curing record as a condition of payment, and make the first measurement before the first large pour. Ask the municipal engineer's office what records it expects for a commercial pour, and ask two suppliers for written quotes on sheeting, hessian or curing compound so you can compare them on the same basis. On site, the supervisor checks that cover is in place, that it stays wet, and that the record is signed. If the contract ties payment to the record, the curing crew is paid to do it.
What to do next
Before you award a concrete package in Bosaso, send every bidder one written question: name the water source, the cover material, the curing duration and the daily hours, and confirm the rate includes them. Compare the answers side by side. Then strike the lowest bid that cannot answer, or price the curing yourself and add it before you sign.
Frequently asked questions
Is the lowest concrete bid in Bosaso always the one missing curing?
Not always, but a bid that cannot name a water source, cover material and curing hours has not priced them. Ask the question in writing and compare the answers before you decide.
Can curing compound replace water curing in Bosaso?
It can be an option where water is scarce or wind is strong, but confirm with the project engineer whether the specification allows it and how it must be applied.
How long should concrete be cured in hot weather?
General practice is to keep it moist for several days, longer for structural elements, but the project specification or engineer sets the figure for your pour.
Local reporting: this article is written for building work in Bosaso and Puntland. Ground conditions, prices and rules differ between places; confirm the details for your own site.