Dump-Truck Fleet Sizing for UAE Earthmoving Projects
The most consistently miscalculated thing on UAE earthmoving projects is dump-truck fleet sizing. Too few trucks and the excavator sits idle for 30% of its day; too many and they queue at the loading point. The correct number depends on excavator cycle time, truck capacity, and haul distance — and the answer changes by season because UAE summer haul-cycle-times run 8–12% slower than winter.
The basic formula
Fleet size = (truck cycle time) ÷ (load time at excavator)
Where:
- Truck cycle time = load + haul + dump + return + queue allowance.
- Load time = number of bucket cycles × cycle time.
Both in minutes. If the truck cycle is 24 minutes and load time is 4 minutes, you need 6 trucks to keep the excavator continuously loading.
UAE-specific corrections
Summer cycle-time correction
Truck haul speeds in UAE summer drop because:
- Drivers slow down to manage tyre heat (legitimate; sustained 90 km/h on a 50 °C tarmac shortens tyre life materially).
- Engine cooling cycles are tighter; trucks idle more between hauls.
- Operator fatigue / heat stress on the driver is real. Driver shifts often run shorter than nominal.
Practical correction: add 8–12% to truck cycle time in May–September. So a 24-minute winter cycle becomes ~26–27 minutes summer. Fleet sizing scales accordingly.
Haul-distance reality on UAE projects
Most UAE earthworks projects have a haul to a designated dump site or to the project's own fill area. Haul distances:
| Project type | Typical haul | Round-trip time (winter) |
|---|---|---|
| Urban infrastructure (Dubai, Abu Dhabi, Sharjah) | 5–15 km | 20–35 min |
| Airport / DWC works | 3–8 km internal | 15–25 min |
| Etihad Rail civil works | 2–10 km project-internal | 10–25 min |
| Solar farm civil | 1–3 km internal | 8–15 min |
| Highway works | 10–30 km | 30–60 min |
Fleet ratio — rule of thumb
For most UAE construction work with 20m³ dump trucks paired with 22T excavators:
- Short haul (under 3 km): 3–4 trucks per excavator
- Medium haul (3–10 km): 5–7 trucks per excavator
- Long haul (10–25 km): 8–12 trucks per excavator
For 35T excavators paired with 25m³ dump trucks: same ratios because both numerator and denominator scale proportionally.
The economic optimum
The right fleet isn't the one that keeps the excavator at 100% utilisation — it's the one that minimises total fleet cost per cubic metre moved.
An excavator runs at AED 200–350 / hour all-in (including operator, fuel, depreciation). A 20m³ dump truck runs at AED 120–180 / hour all-in. So:
- Excavator idle time costs AED ~280 / hour wasted.
- Dump-truck queue time costs AED ~150 / hour wasted (the truck still earns its operator wage when queued).
The economic optimum is to slightly over-supply trucks, because excavator idle is more expensive than truck queue. Aim for excavator at 92–96% utilisation (small idle), trucks at 80–88% (small queue).
The practical operational note
Most UAE projects operate on the "one extra truck" rule: take the calculated fleet number and add one. This handles:
- One truck out of service for any reason on a given day (puncture, breakdown, driver-medical).
- The slowest truck on the rotation (drivers vary by 5–10% on cycle time).
- Unexpected site delays at either the load or dump end.
Where we fit
We supply 22T and 35T excavators paired with 20m³ dump trucks as a matched fleet. For a typical 30,000 cubic-metre month at 15 km haul, that's a fleet of ~3 excavators and ~24 dump trucks. We can size and quote the full fleet in one shot. Send us your monthly volume and haul distance.
Sizing a fleet for a UAE earthworks contract?
Send us your monthly volume and haul distance — we'll quote the full matched fleet.
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