Asphalt Spread Rate and Yield Check
The spread rate (lb/sy) a mat lays and the yield (sy/ton) a paving crew checks load by load: spread = thickness x density x 0.75; yield = 2000 / spread. A 2 in mat at 145 pcf lays 217.5 lb/sy and yields 9.2 sy/ton; a 3 in lift lays 326 lb/sy at 6.1 sy/ton. A low yield means the mat is running thick or the trucks are short. The mix design's compacted density governs.
Formula and source
spread_lb_per_sy = thickness_in x density_pcf x 0.75 (0.75 = 9 sf/sy / 12 in/ft); yield_sy_per_ton = 2000 / spread_lb_per_sy.
Asphalt spread / yield identity by name (spread = thickness x density x conversion; yield = 2000 / spread); first-principles unit arithmetic.
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