Performance of Porous Asphalts with Various Additives: Laboratory Assessment

Porous asphalt generally has strongly gap-graded aggregate gradations to yield higher air voids. It has many good functional properties such as higher pavement surface texture, better drainage property and lower external noise. However, its structural properties, such as durability and strength, are relatively poor compared to conventional dense asphalt. The objective of this study is to evaluate the approaches to improve the durability and strength of the porous asphalt through laboratory testing. Porous asphalt specimens were prepared using three types of binders: high-viscosity binder (HVB), PG76-22, and PG70-22. Various additives: fiber, hydrated lime and DBS polymer, were utilized in the porous asphalt. Comprehensive laboratory tests, including strength test, binder draindown test, Cantabro abrasion test, moisture susceptibility test, rutting test, thermal stress restrained sample test, and permeability test, were conducted. It is found that HVB significantly improved the overall performance of the porous asphalt; DBS additive improved its high-temperature performance, but lowered the cracking resistance at low temperature as well as the durability; fiber enhanced its durability and anti-cracking performance at low temperature; hydrated lime improved its moisture stability while weakening its durability. It is concluded that HVB and polyester fiber should be used in all porous asphalt; DBS additive is good for porous asphalt in high temperature areas, and hydrated lime can be added to porous asphalt in rainy areas.

Language

  • English

Media Info

  • Media Type: DVD
  • Features: References; Tables;
  • Pagination: 13p
  • Monograph Title: TRB 89th Annual Meeting Compendium of Papers DVD

Subject/Index Terms

Filing Info

  • Accession Number: 01157666
  • Record Type: Publication
  • Report/Paper Numbers: 10-2746
  • Files: TRIS, TRB
  • Created Date: Jan 25 2010 11:20AM