TABLE 21-8 Soil classifications and compaction requirements (average) SYMBOL DESCRIPTION LIFT THICKNESS ROLLING SPEED NUMBER OF PASSES COMPACTED INCHES (MPH/VPM) GW Well-graded gravels or 18 (BEST) 4 mph 8 gravel sand mixture with 1400 vpm 5% or less fines GP Poorly graded gravels or 18 (BEST) 4 mph 8 gravel-sand mixture with 1400 vpm little or no fines GM Silty gravel and poorly 12 4 mph 6 graded gravel-sand silt 1100 vpm mixtures GC Clayey gravel and poorly 12 4 mph 6 graded gravel-sand-clay 700 vpm mixture SW Well-graded sands or 18 (BEST) 4 mph 8 gravely sand mixture 1400 vpm with 5% or less fines SP Poorly-graded sands or 18 (BEST) 4 mph 8 gravely sand mixture 1400 vpm with 5% or less fines SM Silty sands, sand-silt 12 4 mph 6 mixture 1100 vpm SC Clayey sands, sand-clay 12 3 mph 7 mixture 700 vpm ML Inorganic silt of low 8 3 mph 7 plasticity, silty fine 700 vpm sands CL Inorganic clay of low 8 3 mph 7 to medium plasticity, 700 vpm lean OL Organic silt and organic * N/A N/A silt-clay of low plasticity MH Inorganic silt * N/A N/A micaceous or diatomaceous silty soil CH Inorganic clay of high * N/A N/A plasticity, fatty clays OH Organic clay medium to * N/A N/A high plasticity S 3 MPH L 8" P 7 (d) Step #3: Determine Operator/Time Factor (E). Due to the fact an operator cannot physically operate a Vibratory compactor for more than 50 minutes without a break, it is necessary to figure an efficiency factor. This is taken from the table below. E .83
TABLE 21-8 Soil classifications and compaction requirements (average) SYMBOL DESCRIPTION LIFT THICKNESS COMPACTED INCHES ROLLING SPEED (MPH/VPM) NUMBER OF PASSES GW Well-graded gravels or gravel sand mixture with 5% or less fines 18 (BEST) 4 mph 1400 vpm 8 GP Poorly graded gravels or gravel-sand mixture with little or no fines 18 (BEST) 4 mph 1400 vpm 8 GM Silty gravel and poorly graded gravel-sand silt mixtures 12 4 mph 1100 vpm 6 GC Clayey gravel and poorly graded gravel-sand-clay mixture 12 4 mph 700 vpm 6 SW Well-graded sands or gravely sand mixture with 5% or less fines 18 (BEST) 4 mph 1400 vpm 8 SP Poorly-graded sands or gravely sand mixture with 5% or less fines 18 (BEST) 4 mph 1400 vpm 8 SM Silty sands, sand-silt mixture 12 4 mph 1100 vpm 6 SC Clayey sands, sand-clay mixture 12 3 mph 700 vpm 7 ML Inorganic silt of low plasticity, silty fine sands 8 3 mph 700 vpm 7 CL Inorganic clay of low to medium plasticity, lean 8 3 mph 700 vpm 7 OL Organic silt and organic silt-clay of low plasticity * N/A N/A MH Inorganic silt micaceous or diatomaceous silty soil * N/A N/A CH Inorganic clay of high plasticity, fatty clays * N/A N/A OH Organic clay medium to high plasticity * N/A N/A S 3 MPH L 8" P 7 (d) Step #3: Determine Operator/Time Factor (E). Due to the fact an operator cannot physically operate a Vibratory compactor for more than 50 minutes without a break, it is necessary to figure an efficiency factor. This is taken from the table below. E .83
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