Laboratory and Field Tests on Aggregate Base Material for Caltrans Accelerated Pavement Testing Goal 5
AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH
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This report characterizes the aggregate base material used for Caltrans Accelerated Pavement Testing APT Goal 5. Laboratory and field tests were performed on aggregate base material used in the construction of the Heavy Vehicle Simulator HVS test sections at the University of Californias Richmond Field Station. Excess water accumulating in untreated granular base layers may cause damage through four mechanisms weakening, buoyancy, expansive soils, and frost heave. To prevent and mitigate water damage, drainage structures are often incorporated into pavement design. Presently, California Department of Transportation Caltrans design for flexible pavements includes an asphalt treated permeable base ATPB layer between the traffic-bearing asphalt concrete layer and the aggregate base layer. This report summarizes the laboratory and field evaluation of typical Caltrans aggregate base course density and permeability relationships. Tests to determine the permeability of aggregate base materials were performed according to AASHTO, ASTM, and Caltrans compaction and permeability standards. This report gives a description and results from tests performed on the aggregates used in the construction of an aggregate base course for the Caltrans Accelerated Pavement Testing at the Richmond Field Station. The aggregate base material met the Caltrans gradation standards and was compacted according to the Caltrans specifications. This report evaluates the effect of aggregate base density and permeability on in-situ moisture content, assess the effectiveness of asphalt treated permeable base ATPB courses and recommends future testing.
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