Roller Compaction Production Rate
Surface coverage (sf/hr, sy/hr) and compacted cubic yards per hour a roller turns out from the drum width, speed.
Example
You enter
- Compacting drum width (ft) 7
- Roller speed (mph) 3
- Compacted lift thickness (in) 8
- Passes to reach spec density 6
- Job efficiency 0.75
You get
- Surface coverage 13860
- Area (SY/hr) 1540
- Compacted production 342.2 compacted cy/hr
Checked against published worked examples from: US Army.
Details, formula, and sources
ScopeLift thickness, and passes - the production that sizes the fill schedule and the number of rollers. The test strip sets the passes.
Formula or tablearea_sf_hr = drum_width x speed x 5280 x efficiency / passes; area_sy_hr = area_sf_hr / 9; production_ccy_hr = area_sf_hr x (lift/12) / 27 = 16.3 x width x speed x lift x efficiency / passes (16.3 = 5280 / (12 x 27)).
Source and editionRoller production identity by name (compacted volume rate from coverage and lift); first-principles unit-folding arithmetic.
Free accessThe roller coverage-rate identity is published earthmoving practice; the 5280 / 12 / 27 unit constant is exact.
What governsEstimate. AHJ and licensed professional govern.
API field namesdrum_width_ft, speed_mph, lift_in, passes, efficiency, area_sf_hr, area_sy_hr, production_ccy_hr
- Efficiency 0.75 job efficiency (default; real-world delays)earthmoving practice
- Unit constant 16.3 = 5280 / (12 x 27) folds mile, inch, and cubic yard (exact 16.2963)physical fact