Parkways and park roads | ||
BITUMINOUS MATERIALS:
Requires soils analysis to determine thickness of pavement.
Asphalt Institute establishes various thickness and spec for
soils.Low Type Bituminous: for wheel loads up to 7000 pounds; life
up to two years; requires annual seal coat; low cost, high
maintenance; surface treatment less than 1″ thickness;
"prime and seal coat: Armor coat"Calculate thickness according to Seelye table for "design of
flexible pavements"; design curves are by Asphalt Institute;
soils are classified by USDA or USCESelection of Bituminous Material depends largely on temperature!
RT-1 is 60° to 125° (RT = Road Tar) RT-12 is 175° to 250° RTCB is 60° to 120° (RTCB = Road Tar Cut Back) SC-0 is 50° to 120° (SC = Slow Curing Road Oil) SC-6 is 400° to 400° MC-0 is 50° to 150° (MC = Medium Curing Cut Back Asphalt) MC-5 is 200° to 275° 7RC-0 is 60° to 125° (RC = Rapid Curing Cut Back Asphalt) RC-5 is 200° to 250° SS-1&2 is 50° to 120° (SS = Slow Setting Asphalt Emulsion, AE) MS-1 is 60° to 120° (MS = Medium Setting Asphalt Emulsion, AE) RS-1 is 80° to 135° (RS = Rapid Setting Asphalt Emulsion, AE) Asphalt Cement Penetration is hot application from 275° to 400°
(the higher the number the more viscous the material)Types of Pavement:
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12
Parkways and park roads | ||