RELATIONSHIPS OF FLOW PROPERTIES TO CHEMICAL COMPOSITION FOR PAVING ASPHALTS

IN RECENT YEARS CONSIDERABLE RESEARCH HAS BEEN DEVOTED TO THE PHYSICAL AND CHEMICAL PROPERTIES OF ASPHALT. BECAUSE OF THE DEPENDENCY OF THE PHYSICAL PROPERTIES ON CHEMICAL COMPOSITION, THERE IS A NEED FOR MORE FUNDAMENTAL KNOWLEDGE OF THEIR INTERRELATIONSHIPS. THIS STUDY WAS CONDUCTED TO DETERMINE RELATIONSHIPS BETWEEN CHEMICAL COMPOSITION AND RHEOLOGICAL PROPERTIES OF PAVING-GRADE ASPHALTS. RHEOLOGICAL PROPERTIES AND CHEMICAL COMPOSITIONS WERE DETERMINED FOR NINE PAVING-GRADE ASPHALTS. FLOW PROPERTIES AT 45, 77, AND 120 F WERE OBTAINED BY MEANS OF A SLIDING-PLATE MICROVISCOMETER. A MODIFIED CORBETT-SWARBRICK CHROMATOGRAPHIC METHOD FOR CHEMICAL COMPOSITION DATA WAS EMPLOYED. MULTIPLE-LINEAR-REGRESSION ANALYSIS YIELDED EQUATIONS THAT RELATED FLOW PROPERTIES AT 120 F TO CHEMICAL COMPOSITION. THE COEFFICIENT OF THERMAL EXPANSION WAS FOUND TO BE A SIGNIFICANT QUANTITY FOR THE DESCRIPTION OF THE FLOW PROPERTIES AT THE LOWER TEMPERATURES. REGRESSION EQUATIONS WERE OBTAINED FOR THE FLOW PROPERTIES AT 45 AND 77 F, AND FOR THE WALTHER VISCOSITY-TEMPERATURE SLOPE WHEN THE EXPANSION COEFFICIENTS WERE INCLUDED IN THE REGRESSION ANALYSIS. IT WAS CONCLUDED THAT THE FLOW BEHAVIOR OF ASPHALTS IN THE LOWER RANGE OF SERVICE TEMPERATURE WAS MORE DEPENDENT ON FACTORS SUCH AS ASSOCIATION AND COLLOIDAL STATE THAN ON THE RELATIVE CONTENT OF THE GENERIC CHEMICAL GROUPS USED IN THIS STUDY. /AUTHOR/

Media Info

  • Media Type: Print
  • Features: References; Tables;
  • Pagination: pp 24-33
  • Monograph Title: Physical factors affecting the durability of asphaltic pavements
  • Serial:

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Filing Info

  • Accession Number: 00211347
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Oct 14 1994 12:00AM