pg grade selection
DESCRIPTION
PG Grade Selection. Low Pavement Design Temperature T surf - 0.859 Tair + 1.7 T air = 1 day minimum air temperature Note: currently under review High pavement Design Temperature T 20mm = (T air -0.00618Lat 2 + 0.2289Lat + 42.2) x(0.9545) - 17.78 - PowerPoint PPT PresentationTRANSCRIPT
PG Grade Selection• Low Pavement Design Temperature
– Tsurf - 0.859 Tair + 1.7
• Tair = 1 day minimum air temperature
– Note: currently under review
• High pavement Design Temperature
– T20mm = (Tair-0.00618Lat2 + 0.2289Lat + 42.2) x
(0.9545) - 17.78
• T20mm = high design temp at a depth of 20 mm
• Tair = 7 day average high air temp
• Lat - geographical latitude in degrees
PG Grade Selection