ANALYSES OF THE FATIGUE TYPE PROPERTIES OF BITUMINOUS CONCRETE

PROGRESS TO DATE IS REVIEWED ON THE STUDIES OF ELASTIC PROPERTIES OF BITUMINOUS CONCRETE, PARTICULARLY AS RELATED TO FATIGUE OR REPETITIONAL FACTORS. SOME FUNDAMENTAL ASSUMPTIONS AND BROAD BASIC PRINCIPLES ARE DISCUSSED BRIEFLY, BUT CONCERN IS PRIMARILY CENTERED ON THE BEHAVIOR OF A MATERIAL UNDER STRESS. CONSIDERATIONS ARE GIVEN TO THE STRENGTH, DEFORMATION, AND FATIGUE PROPERTIES OF A GIVEN ASPHALTIC CONCRETE MIX UNDER VARIOUS CONDITIONS OF LOADING. IT WAS DETERMINED THAT THE STRESS AND STRAIN CHARACTERISTICS OF ASPHALTIC CONCRETE MIXTURES DEPEND ON SEVERAL VARIABLES, THE MOST IMPORTANT OF WHICH, FOR A GIVEN MIX, ARE THE TEMPERATURE AND THE RATE OF STRAIN. EQUATIONS ARE GIVEN WHICH RELATE THE COMPRESSIVE STRENGTH OF ASPHALTIC CONCRETE TO THE TEMPERATURE AND THE RATE OF STRAIN. ASPHALTIC CONCRETE DISPLAYS ELASTIC BEHAVIOR IN THAT AN APPROXIMATE PROPORTIONALITY EXISTS BETWEEN UNIT STRESS AND UNIT STRAIN IN UNCONFINED COMPRESSION. YOUNG'S MODULUS FOR A GIVEN ASPHALTIC CONCRETE IS VARIABLE, DEPENDENT UPON THE RATE OF LOADING AND UPON TEMPERATURE, HOWEVER, THERE SEEMS TO BE A CONSTANT PROPORTIONALITY BETWEEN YOUNG'S MODULUS AND THE COMPRESSIVE STRENGTH OF ASPHALTIC CONCRETE, AT HIGH RATES OF LOADING AND AT LOW OR MODERATE TEMPERATURES, BITUMINOUS CONCRETE POSSESSES CONSIDERABLE FLEXURAL STRENGTH AS MEASURED BY ITS MODULUS OF RUPTURE. HOWEVER, THIS SLAB STRENGTH DECREASES RAPIDLY WITH INCREASING TEMPERATURE AND STATIC CONDITIONS OF LOADING. UNDER REPEATED DYNAMIC LOADING, SEVERAL THOUSAND FLEXURAL STRESSES CAN BE APPLIED TO AN ASPHALTIC CONCRETE BEAM, BEHAVING IN AN ELASTIC FASHION INSOFAR AS LOAD-DEFLECTION CONSIDERATIONS ARE CONCERNED, WITHOUT A RESULTING FAILURE. ASPHALTIC CONCRETE, LIKE OTHER STRUCTURAL MATERIALS, IS SUBJECT TO FATIGUE FAILURE. THE LIMITING FACTOR ON THE CONTROL OF THE MAGNITUDE OF THE PAVEMENT DEFLECTION AND, HENCE, THE STRESS LEVEL IN THE PAVEMENT, IS THE SUBGRADE SUPPORT. BECAUSE OF THE CONFINING NATURE OF THE PAVEMENT, IT MUST BE RECOGNIZED THAT A FAILURE OF THE PAVEMENT (STRESS LEVEL EXCEEDS STRENGTH) MUST DEVELOP BEFORE SHEAR FAILURES OF THE SUBGRADE CAN OCCUR.

• Supplemental Notes:
  • Iii + 54 Pp, 18 FIG, 4 TAB, 20 REF
• Corporate Authors:

  Ohio State University, Columbus

  Engineering Experiment Station, 2070 Neil Avenue
  Columbus, OH  United States  43210
• Authors:
  • Papazian, H S
  • Baker, R F
• Publication Date: 1959-1

Subject/Index Terms

• TRT Terms: Asphalt concrete; Compressive strength; Concrete; Deflection; Deformation; Dynamic loads; Equations; Failure; Fatigue (Physiological condition); Flexural strength; Modulus of elasticity; Modulus of rupture; Pavements; Physical properties; Strain (Mechanics); Subgrade (Pavements); Temperature
• Uncontrolled Terms: Concrete properties; Strain rate
• Old TRIS Terms: Pavement deflection
• Subject Areas: Highways; Materials; Pavements;

Filing Info

• Accession Number: 00210684
• Record Type: Publication
• Files: TRIS
• Created Date: Feb 20 1994 12:00AM