In brief
- Asphalt temperature experience gaps in Burao show up as cold joints and unrecorded mat temperatures, not as obvious crew failures.
- Ask for the mix design's target temperatures, the supplier's haul and compaction window, and dated temperature records from a comparable job.
- Supervision should record mat temperature and time at the paver for each truck, then verify roller passes before the mix drops below the compaction window.
Contents
Asphalt temperature experience gaps in Burao rarely show up as a crew that cannot lay blacktop. They show up when nobody on site can say what the mix supplier's target temperatures are, how long the haul from the plant allows, or what the roller needs to do before the mat cools past the compaction window. Ask for the mix design and a dated temperature record from a comparable job before mobilisation.
Why does the experience gap matter more than the crew's confidence?
A paving crew can lay a straight, even mat and still leave a road that debonds within a season. Temperature control decides whether the aggregate and bitumen in the mix are workable at the paver, whether the roller can still compact, and whether the next truck's load fuses to the previous one at the joint.
General practice for hot mix asphalt places compaction temperatures against the mix design, often with a defined window below laying temperature on the supplier's job mix formula. Confirm the actual figures for the mix being supplied against the project specification and the engineer, because they change with binder grade and aggregate.
Where the gap bites is that nobody holds the number. On a Burao job, ask the crew foreman three questions: what is the target discharge temperature at the plant, what is the minimum rolling temperature, and how long does the haul take. A foreman who answers from the mix design has the experience. One who answers with a shrug is relying on the paver operator's feel.
What actually happens to the mat when temperature control slips?
The mat goes down looking acceptable and then fails at the joints and the thin spots. Cold mix arriving at the paver stiffens before the roller reaches it, so the achieved density drops and the surface ravels under traffic. A cold joint between two loads leaves a plane that water follows. Ambient temperature and haul distance both affect the compaction window, and each site needs its own figures: ask the engineer to confirm the window for the mix and the route before paving starts.
Detection is practical. Walk a recent job by the same crew and look for joint lines that have opened, oxidation at the edges, and loose aggregate at the surface. Ask the supervisor for the daily paving record: truck number, discharge time, arrival time, mat temperature at the paver, roller passes completed before the mat dropped below the rolling limit. If no such record exists, experience in temperature control cannot be evidenced either way.
How do you close the gap before work starts?
Put the numbers in the contract documents and on the site wall. Ask the mix supplier for the job mix formula with target discharge, laying and minimum rolling temperatures, then ask how long the haul from the plant to the Burao site takes and what that does to the window. Ask the contractor to name the person who will hold the thermometer and record temperatures, and to submit sample records from a comparable job with the bid.
During the work, check that the thermometer is calibrated and that records are made at the paver, not reconstructed afterwards. Ask the municipal engineer's office whether it holds paving records or compaction test results for other roads in the town, and whether it has any requirement on temperature recording for municipal work. Confirm the testing regime, whether cores or density checks, with the project engineer, since the specification sets the frequency.
Where a crew genuinely lacks the experience, the practical options are a trial section before the main run, a supplier technician on site for the first days, or a supervisor who insists on records until the routine is established.
What to do next
Before the next Burao paving job mobilises, ask the contractor for the mix supplier's job mix formula, the target and minimum rolling temperatures, an estimated haul time to site, and one dated temperature record from a comparable job. If the contractor cannot produce them, ask the project engineer to require a trial section with recorded mat temperatures and roller passes before the main run starts.
Frequently asked questions
What temperature should asphalt be when it leaves the plant in Burao?
That figure comes from the mix design and the supplier's job mix formula, not from a general rule. Ask the supplier for the target discharge temperature in writing and confirm it against the project specification and the engineer before paving.
How do you check a paving crew's temperature experience?
Ask for dated paving records from a comparable job showing mat temperature at the paver and roller passes completed before the mat cooled. Walk a road the crew built and look at the joints.
Local reporting: this article is written for building work in Burao and Somaliland. Ground conditions, prices and rules differ between places; confirm the details for your own site.