Skip to main content

Table 6 Construction requirements of the asphalt-treated permeable base in cold regions

From: Review of porous asphalt pavements in cold regions: the state of practice and case study repository in design, construction, and maintenance

Construction Requirements
Weather and Site Conditions • ≥ 10 °C (50 °F) [42]
Plant Mixing • ≤ 177 °C (350 °F); mixing temperature range is determined based on the viscosity or recommended by asphalt binder supplier
Silo Storage • ≤ 8 h [45]
• ≤ 2 h [44]
Placement Thickness • ≤ 10.2 cm (4-in.) ([38, 45], and [42])
• ≥ twice the maximum aggregate size in ATPB [42]
Roller Selection • Steel-wheeled roller with a weight of 8–10 tons and operated using static mode with no vibration ([37, 45], and [40])
• Pneumatic tire roller is prohibited.
Rolling temperature • 60–110 °C (140–230 °F) [40]
• Sufficient cool but higher than 43.3 °C (110 °F) [37] or 37.8 °C (100 °F) [38]
Rolling pattern • Two to four passes and avoid over-rolling
• APWA-WA-LAGSPs [5]: low amplitude oscillatory rolling mode first to seat and static mode to smooth the surfaces; targeted air voids of 15–20% and minimum infiltration rate of 63 mm/min. (150 in./h) tested by ASTM C170.
Inspections • Elevation, thickness, and smoothness requirements ([37] and [45])
Protections • Free of contaminations; geotextile fabric can be used to cover the ATPB and maintain its cleanliness [17]
• Traffic is not permitted on the ATPB course [45]
• Traffic is allowed after a 72-h cure [42]
Tack Coat • Not allowed on the newly-placed and clean ATPB course [5, 40]
• Light tack coat (0.02 gal/yd2 residual asphalt) may be used when the ATPB course is dirty [5]