• Mcdaniel, Rebecca S.
• Shah, Ayesha
• Kowalski, Karol

Abstract

Providing adequate friction at the tire-pavement interface is a critical element forensuring the safety of the traveling public. The Indiana Department of Transportation has used alaboratory screening test to fabricate, polish and test slabs of a mixture containing an unfamiliarcoarse aggregate that is proposed for approval for use in an asphalt surface mixture. If thelaboratory performance of the unfamiliar aggregate is comparable to that of a mix slab made witha known, approved aggregate, a field test section can be built and monitored to determine if theunfamiliar aggregate can be approved for use. Based on the success of the method, the researchsummarized here was conducted to see if cylindrical samples could be tested in lieu of slabs. Theidea was that gyratory specimens possibly could be used to approve mix designs beforeconstruction and field cores could be used to accept pavement construction. The results of thisstudy comparing four different specimen types from five different mixtures showed that testingcylindrical samples is feasible. The textures and friction levels of the different specimen types werecomparable. Changes have been made to the existing test method based on this work. Additionalfield monitoring and testing of poorer quality aggregate materials are needed to verify the resultsand establish specification limits for mix design approval and construction acceptance; research tothis effect has been proposed.

Topics

• impedance spectroscopy
• surface
• texture