THE EFFECTS OF THE RHEOLOGICAL PROPERTIES OF ASPHALT ON STRENGTH CHARACTERISTICS OF ASPHALT CONCRETE

IN THE DESIGN OF ASPHALT PAVEMENTS, CONSIDERATION SHOULD BE GIVEN TO THE STRESSES IMPOSED ON THE PAVEMENT AND THE ABILITY OF THE PAVEMENT TO RESIST THESE STRESSES. A MAJOR CONCERN IN THE DESIGN OF AN ASPHALT CONCRETE SURFACE COURSE IS THE VERTICAL STRESS TRANSMITTED TO THE SURFACE FROM TIRE CONTACT. ALSO TO BE CONSIDERED ARE THOSE STRESSES IN THE SURFACE WHICH RESULT FROM SHRINKAGE AND EXPANSION WITH VARIATIONS IN TEMPERATURE. AN ASPHALT PAVEMENT SURFACE WILL BE SUBJECTED TO COMPRESSION, FLEXURE, AND TENSION STRESSES UNDER VARYING CONDITIONS OF LOAD AND ENVIRONMENTAL CONDITIONS. FOR THIS INVESTIGATION, ASPHALT CONCRETE TEST SPECIMENS WERE PREPARED IN THE LABORATORY USING LIMESTONE AGGREGATE OF ONE GRADATION AT AN ASPHALT CONTENT OF 5.5 PERCENT, BASED ON THE TOTAL WEIGHT OF THE MIX. FIVE ASPHALTS WERE USED' THREE WERE FROM VENEZUALIAN CRUDES AND HAD PENETRATIONS OF 70, 94, AND 173; AND THE OTHER TWO WERE OF PENETRATION GRADE 85-100, ONE FROM ROCKY MOUNTAIN CRUDE AND THE OTHER FROM CALIFORNIA CRUDE. THE EFFECTS OF ASPHALT VISCOSITY ON THE COMPRESSIVE STRENGTH OF ASPHALT CONCRETE AT 80 AND 140 DEGREES F, AND AT A RATE OF DEFORMATION OF 0.05 INCH PER MINUTE, WERE EVALUATED. TRIAXIAL SPECIMENS WERE TESTED AT ZERO AND AT 30 POUNDS PER SQUARE INCH LATERAL CONFINEMENT. ALSO, THE INFLUENCE OF RATE OF LOADING ON THE COMPRESSIVE STRENGTH OF ASPHALT CONCRETE AT 80 DEGREES F WAS INVESTIGATED. THE DATA WERE ANALYZED TO DETERMINE PAVEMENT RESISTANCE TO TIRE CONTACT PRESSURE. MODULUS OF RUPTURE FOR MIXTURES USING EACH TYPE OF ASPHALT WAS DETERMINED AT 40 AND 80 DEGREES F. THE INFLUENCE OF REPETITIVE LOADING ON FLEXURE STRENGTH IS SHOWN. THE INFLUENCE OF ASPHALT VISCOSITY ON THE TENSILE STRENGTH AND DEFORMATION OF ASPHALT CONCRETE WAS INVESTIGATED. INSTRUMENTATION AND TEST PROCEDURES ARE DESCRIBED. THE APPLICATION OF THE RESULTS OF THIS INVESTIGATION TO ASPECTS OF ASPHALT PAVEMENT DESIGN IS DISCUSSED. /AUTHOR/

• Supplemental Notes:
  • Preprint VoL, PP 628-640, 10 FIG, 8 TAB, 5 REF
• Authors:
  • Hewitt, W L
  • SLATE, F O
• Conference:
  • Intl Conf Struct Design Asphalt Pvmts
• Publication Date: 1967-1

Subject/Index Terms

• TRT Terms: Asphalt; Asphalt concrete; Asphalt pavements; Compressive strength; Deformation; Expansion; Limestone aggregates; Pavement design; Rheological properties; Shrinkage; Specimens; Strength of materials; Stresses; Temperature; Tensile strength; Viscosity
• Subject Areas: Highways; Materials; Pavements;

Filing Info

• Accession Number: 00210673
• Record Type: Publication
• Files: TRIS
• Created Date: Sep 15 1994 12:00AM