Calculate the asphalt quantity needed in tons based on area, layer thickness and mix type, accounting for compaction during laying.
| Step | Formula |
|---|---|
| Volume | Area × Thickness |
| Weight | Volume × density (kg/m³) × compaction factor ÷ 1000 |
A compaction factor is needed because loose (uncompacted) asphalt takes up more volume than the final compacted layer — without it you'd run short of material.
A private driveway usually uses a 4–6 cm layer. Streets with heavier traffic need 6–10 cm, highways — multiple layers up to 14 cm.
Asphalt mix is loaded loosely, and once laid and rolled its volume shrinks by about 5–8%. Without this factor you'd calculate less material than you'll actually need.
AC (asphalt concrete) is the standard mix for most pavements. SMA (stone mastic asphalt) is tougher and more deformation-resistant, used for high-traffic surfaces.
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