In this study, an apparatus and a technique were developed to measure the amount of exposed surface area on asphalt- coated mineral aggregate particles after they have been subjected to the stripping effects of water. The test procedure is based on the principle that calcareous or siliciferous minerals will react with a suitable reagent and create a gas as part of the chemical reaction products. Within reasonable time limits in a sealed container, the generated gas creates a certain amount of pressure that can be considered proportional to the mineral surface area exposed to the reagent. With proper selection of reagents and reagent concentrations, asphalt, being a relatively inert substance, will not enter into the reaction and will not contribute to the created gas pressure. By using duplicate aggregate samples, one uncoated and the other asphalt-coated and partially stripped, the change in gas pressure of the respective samples can be compared to determine the amount of exposed surface area on the partially coated sample. This procedure was used to measure the amount of stripping evidenced by 11 aggregate-asphalt mixtures. The aggregates, obtained from various Oklahoma sources, included several different types of carbonate and siliceous materials. The quantitative results of the surface reaction test were compared with visual evaluations of similar mixtures that were subjected to static and dynamic immersion stripping procedures.

Media Info

  • Media Type: Print
  • Features: Figures; Photos; References; Tables;
  • Pagination: pp 40-54
  • Monograph Title: Characteristics of and factors influencing bituminous materials and mixtures
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00095567
  • Record Type: Publication
  • ISBN: 0309023599
  • Report/Paper Numbers: #517
  • Files: TRIS, TRB
  • Created Date: Jul 2 1975 12:00AM