CURRENT TRENDS IN THE DETERMINATION OF PLASTIC DEFORMATIONS

TENDENCIAS ACTUALES SOBRE DETERMINACION DE DEFORMACIONES PLASTICAS

LABORATORY TESTS FOR THE STUDY OF THE MECHANICAL BEHAVIOUR IN THE PRESENCE OF THE PLASTIC DEFORMATION OF BITUMINOUS MIXES MAY BE DIVIDED INTO TWO GROUPS: (1) STATIC TESTS WHICH EVALUATE THE BEHAVIOUR UNDER STATIC LOADING AND THE RESISTANCE TO SHEAR STRESSES WITH TANGENTIAL TENSILE STRESSES; IT IS ONLY POSSIBLE TO OBTAIN A RELATIVE AND COMPARATIVE EVALUATION OF CERTAIN MIX DESIGN PARAMETERS. (2) DYNAMIC TESTS, WHICH MAKE IT POSSIBLE TO STUDY THE PROBLEMS OF THE ACCUMULATION OF RESIDUAL DEFORMATIONS; IT IS POSSIBLE TO DISTINGUISH BETWEEN: (A) SIMPLE COMPRESSION (AXIAL OR DIAMETRICAL) OR TRIAXIAL, FROM WHICH ONE CAN DETERMINE NORMALLY THE NUMBER OF LOAD APPLICATIONS WHICH PRODUCE A GIVEN TOTAL OR RESIDUAL DEFORMATION. AMONGST THE TRIAXIAL TESTS, ARE TRIAXIAL TESTS WITH RAPID LOADING FOR THE STUDY OF THE FATIGUE OF MIXES AT LOW TEMPERATURES; AT THE PRESENT TIME THESE ARE EMPLOYED WITH SLOW LOAD TRIAXIAL TESTS, FOR THE EVALUATION OF PLASTIC DEFORMATIONS. AN EXAMPLE OF A DYNAMIC TRIAXIAL TEST IS THE FRENCH ESSO CREEP TEST IN WHICH A SINUSOIDAL COMPRESSION IS APPLIED UNDER CREEP CONDITIONS. (B) IN ANOTHER TYPE OF TEST THE EFFECT OF TRAFFIC IS SIMULATED IN A LABORATORY SCALE MODEL EXPERIMENT; THE MOST WELL KNOWN IS THE WHEEL TRACKING TEST AND THE FRENCH TRACKING TEST; THE RANGE OF APPLICATION OF THESE TESTS ENCOMPASSES THE ESTABLISHMENT OF COMPARATIVE MEASUREMENTS BETWEEN MIXES WHERE CERTAIN PARAMETERS OF DESIGN ARE VARIED. (3) OTHER TESTS INVOLVE EXPERIMENTAL ROADS. THIS CONFERENCE WAS HELD DURING A SESSION OF THE CEIA ON THE PROPORTIONING OF BITUMINOUS MIXES, WHICH TOOK PLACE IN MADRID FROM 1ST - 5TH MARCH, 1976.

  • Authors:
    • Elvira, J L
  • Publication Date: 1976-8

Language

  • Spanish

Media Info

  • Pagination: 35-45
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 01299150
  • Record Type: Publication
  • Source Agency: Institut Francais des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)
  • Files: ITRD
  • Created Date: Nov 21 2010 6:59AM