NEW TEST METHODS FOR STUDYING THE EFFECT OF WATER ACTION ON BITUMINOUS MIXTURES

THE INFLUENCE OF WATER ON THE SERVICE PERFORMANCE OF BITUMINOUS PAVEMENTS HAS BEEN THE OBJECT OF EXTENSIVE RESEARCH FOR MANY YEARS. THERE APPEARS TO BE A CONTINUING NEED FOR TESTS WHICH WILL PROVIDE A MORE POSITIVE MEASURE OF THIS INFLUENCE. THESE TESTS SHOULD BE PERFORMED ON PAVING MIXTURES CONTAINING THE ENTIRE AGGREGATE GRADATION WITH THE DESIGN BINDER CONTENT. PREFERABLY, THE TEST SHOULD ALSO BE PERFORMED ON COMPACTED SPECIMENS THAT CLOSELY SIMULATE THE PAVEMENT IN PLACE ON THE ROAD. THIS REPORT DESCRIBES FOUR NEW TEST METHODS IN USE BY THE CALIFORNIA DIVISION OF HIGHWAYS, WHICH MEASURE THE EFFECTS OF WATER ON BITUMINOUS PAVEMENTS. ONE OF THE TESTS INVOLVES THE USE OF THE DYE TECHNIQUE FOR PROVIDING A QUANTITATIVE MEASURE OF THE DEGREE OF STRIPPING OF THE LOOSE MIXTURE. THE OTHER THREE TESTS ARE PERFORMED ON COMPACTED SPECIMENS, AND PROVIDE METHODS FOR MEASURING THE CHANGE IN PHYSICAL PROPERTIES WHEN SUBJECTED TO MOISTURE VAPOR OR FREE WATER EXPOSURE. RESULTS FROM INVESTIGATIONS CONCERNED WITH THE VARIABLES AFFECTING THE RESISTANCE OF BITUMINOUS PAVEMENTS WHEN SUBJECTED TO THE INFLUENCE OF WATER ARE PRESENTED. THESE STUDIES INDICATE THE IMPORTANCE OF THE CONSISTENCY OF THE BITUMINOUS BINDER IN PREVENTING FAILURES FROM ACTION OF MOISTURE. THEY ALSO INDICATE THAT ADDITIVES VARY IN THEIR EFFECTIVENESS DEPENDING ON THE AGGREGATE SOURCE. THIS STUDY, TO DATE, CLEARLY INDICATES THE IMPORTANCE OF INCLUDING THE ENTIRE MIX GRADATION IN ANY WATER ACTION TEST. THE FINE PORTION OF THE AGGREGATE COMBINATION IS OF FUNDAMENTAL IMPORTANCE AND TESTS PERFORMED ON THE COARSER FRACTION ONLY MAY PROVIDE RESULTS OF LITTLE VALUE IN DETERMINING THE SERVICE PERFORMANCE OF THE PAVEMENT.

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Filing Info

  • Accession Number: 00210921
  • Record Type: Publication
  • Source Agency: Highway Research Board Bibliography
  • Report/Paper Numbers: pp 380-411
  • Files: TRIS
  • Created Date: May 1 1994 12:00AM