Fourth Cycle of Pavement Research at the Pennsylvania Transportation Research Facility. Volume 5. Open-Graded Permeable Subbases at the Pavement Durability Research Facility

摘要

A pavement subbase should be capable of rapidly draining infiltrated moisture while maintaining stability under traffic loads. Six subbases have been incorporated into experimental pavement sections at the Pavement Durability Research Facility. The subbase materials have been examined both in the laboratory and in situ. Permeability was measured in the laboratory to evaluate the drainage capability of each material. The gradation and the degree of compaction were varied to measure these effects on permeability. The measurements were compared with the results of similar studies conducted by other researchers. The results of the research were used to develop a suggested gradation specification for a free-draining subbase aggregate.