Hot Mix Asphalt Calculator
Calculate Hot Mix Asphalt (HMA) tonnage, square yards, and truckloads with temperature loss and density estimates.
= 14.81 Metric Tonnes (7.72 cu yds)
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What Is a Hot Mix Asphalt Calculator?
A Hot Mix Asphalt (HMA) calculator computes the required mass in US tons for standard hot-poured flexible pavement. HMA consists of 95% high-grade crushed aggregate blended with 5% liquid asphalt petroleum binder, heated to 300°F.
How to Use This Calculator
- Input length and width of the project in feet.
- Enter target compacted thickness in inches.
- Review the required HMA tonnage, square yardage, and metric equivalents.
- Estimate the number of delivery trucks needed from the batch plant.
HMA Tonnage Equation
\text{Tons} = \frac{\text{Length (ft)} \times \text{Width (ft)}}{9} \times \text{Thickness (in)} \times \frac{112}{2000} \times 1.05Hot mix asphalt compacts to 112 lbs per square yard per inch. Multiplying by 1.05 provides 5% job site safety allowance.
Worked Example
Scenario: Paving a community sports court: 80 ft by 45 ft with 2 inches of fine-graded hot mix surface asphalt.
Area: 80 × 45 = 3,600 sq ft (400 sq yds).
Weight: 400 sq yds × 2 in × 112 lbs = 89,600 lbs.
Tonnage: (89,600 ÷ 2000) × 1.05 = 47.04 tons.
Tips & Key Notes
- Never pave hot mix asphalt during rain; water causes steam pockets, destroying the binder adhesive bond.
- Use an infrared thermometer to ensure the mix remains above 185°F during final roller passes.
- Apply an asphalt tack coat over existing pavement before overlaying to prevent slippage between layers.
Frequently Asked Questions
What is the difference between Hot Mix Asphalt and Cold Patch?
Hot Mix Asphalt (HMA) is delivered hot from a commercial plant and compacted while molten to form permanent roads and driveways. Cold patch is pre-bagged emergency repair material for potholes that cures by solvent evaporation.
Why does Hot Mix Asphalt smell like petroleum?
HMA contains 5% liquid bitumen, a heavy viscous oil byproduct of crude petroleum refining that acts as the waterproof glue binding aggregates together.
What is the typical compaction percentage of hot mix asphalt?
Loose hot mix asphalt compacts by approximately 20% to 25% under steel drum rollers (e.g. 2.5 inches loose rolls down to 2.0 inches compacted).
Can you pave hot mix asphalt in winter?
Paving in cold weather (<40°F) is discouraged because the thin asphalt layer cools before the roller can achieve required density, leading to premature raveling.
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