How do you check asphalt temperature on a Hargeisa road?

Asphalt temperature skills gaps in Hargeisa decide whether a road bonds or peels. The window between mixing, laying and rolling is short, and the crew must judge it by feel, by timing and by the thermometer. Where that judgement is missing, the mat cools before the roller reaches it, the joint stays unsealed, and water finds the gap in the first Gu rains.

Why does the temperature window matter on a Hargeisa road?

Asphalt has a working range: too hot and the binder drains off the aggregate, too cold and it cannot be compacted. The mixing temperature and the compaction temperature come from the mix design, so ask the project engineer or the approved specification for both figures and for the lowest surface temperature at which rolling may continue.

The risk is not the figure itself, it is who owns it. On a small crew, the same people may load, lay, level and roll. If nobody has been shown how quickly a thin layer loses heat in a dry, breezy afternoon, the roller arrives after the mat has stiffened. Compaction then leaves voids, and voids take in water. Ask the municipal engineer's office whether the specification for your road names a compaction temperature, then check that the crew has a thermometer on site and knows how often to use it.

How does poor bonding show up later?

Bonding fails at the interfaces: between two passes, between old and new asphalt, and between the asphalt and the base. A cold joint is a plane of weakness. Traffic works it, water gets in, and the edge starts to ravel or the layer lifts.

In Hargeisa, the first Deyr or Gu rain can expose it. Look for fretting along the centre line where two passes met, for a darker line that stays wet longer than the surrounding surface, and for edges that crumble under a pick. The mechanism is simple: cold asphalt does not knit, and a joint that does not knit is a drain. Ask for the delivery notes and the laying record, then walk a road the same crew finished one season ago. Check the joints after rain, not straight after laying, because a fresh mat hides the defect.

How do you check competence before the work starts?

Competence here is a sequence: correct mix arriving at the right temperature, laying at a steady rate, rolling immediately behind, and jointing while the edge is still workable. Test it in a trial length.

• Ask who reads the thermometer and what they do if the load arrives cold.
• Watch whether the roller follows the paver without a gap or waits at the end.
• Check how the crew treats a joint: cut back, tack coat, then lay against it while hot.
• Ask what happens when a lorry is late: does the mat stay open, or does the crew stop?

General practice is to keep a tack coat thin and clean and to cut joints square, but confirm the rates and method with the engineer. If the answers are vague, the crew has not done this enough. Request the mix design, the delivery records and any compaction test results, and if there are none, agree a trial section before the main run.

What to do next

Before the next asphalt layer, ask the contractor for a written laying sequence with the temperatures, the joint treatment and the roller positions. Then watch one full day of work from the paver, with a thermometer in the crew's hands, and record the times. If the crew cannot explain its own sequence, arrange a trial section first.