Uniaxial Impact Compressive Characteristics of Permeable Asphalt Concrete

David Hyunchul Shim

Department of civil engineering; Florida Atlantic University, 12201, America

Abstract: In order to investigate the dynamic characteristics of permeable asphalt concrete，a 74mm steel split Hopkinson pressure bar(SHPB)  apparatus was used to conduct uniaxial impact compressive test with various strain rates for permeable asphalt concretes with polyester fiber content of 0 and 0. 3 %.The test re-sults showed there  is a significant strain rate effect on permeable asphalt concrete and the specimen compression ratio increases in strain rate; the specimen compression ratio of the permeable asphalt concrete with polyester fiber is about 1 .2 times as large as that of the concrete without polyester fiber; the dynamic stress-train curve of permeable asphalt concrete includes 3 stages of elastic deformation stage，plastic deformation one and failure one; observing the failure mode of permeable asphalt concrete，the aggregate fracture is considered as the main reason for permeable asphalt concrete failure; polyester fiber in permeable asphalt concrete can delay cracks appearing and spreading and improve dynamic compressive strength, the largest strength increase can reach 45.1%.

Keywords: Permeable asphalt concrete; SHPB; Polyester fiber; Strain rate; Impact compressive strength