STRUCTURAL DESIGN OF FLEXIBLE PAVEMENTS EXPERIMENTAL RESEARCH PROGRAM IN MEXICO

AN EXPERIMENTAL RESEARCH PROGRAM IS CONDUCTED ON FLEXIBLE PAVEMENT THICKNESS DESIGN FOR LOW TRAFFIC HIGHWAYS IN MEXICO. RESEARCH IS CONDUCTED ON SPECIALLY CONSTRUCTED ROADS. THE THREE PROJECTS UNDER STUDY COMPRISE 20 DIFFERENT STRUCTURAL DESIGNS, AND A TOTAL OF 80 FIELD SECTIONS. THE MAIN VARIABLES ARE: (1) THICKNESS OF BASE COURSE, WITH 2 LEVELS (10 AND 20 CM) AND (2) THICKNESS OF SUBBASE COURSE, WITH 3 OR MORE LEVELS (0,10,20 AND 30 CM) DEPENDING ON THE PROJECT. THE EXISTING PAVEMENTS IN THE HIGHWAY NETWORK ARE STUDIED. THE FACTORIAL EXPERIMENT CONSISTS OF 9 PRIMARY CONTROL COMBINATIONS, EACH WITH 16 EXPERIMENTS, GIVING A TOTAL OF 144 SECTIONS FOR THE PERFORMANCE SURVEY. THE MAIN VARIABLES ARE: (1) CLIMATE, WITH 3 LEVELS: OPTICAL, STEPPE, AND SUBTROPICAL, AND (2) SUBGRADE STRENGTH, WITH THREE LEVELS: LOW, MEDIUM, AND HIGH. RESEARCH IS CONDUCTED ON PAVEMENT BEHAVIOR OF FIELD SECTIONS IN THE HIGHWAY NETWORK AND STUDY OF FULL-SCALE MODELS IN THE LABORATORY. A CIRCULAR TEST TRACK IS PLANNED FOR THE LATTER TEST. EXPERIMENTATION IS CONDUCTED WITH NON-DESTRUCTIVE TEST METHODS TO ESTIMATE PERFORMANCE. THE CHLOE PROFILOMETER HAS BEEN USED WITH SATISFACTORY RESULTS WHEN THE TEXAS FORMULA IS APPLIED TO DETERMINE PRESENT SERVICEABILITY INDEX. BENKELMAN BEAM REBOUND DEFLECTIONS ARE POOR INDICATORS OF COMPOSITE STRENGTH IN THE STUDIED PAVEMENTS. REPEATED FIELD PLATE BEARING TESTS, USING A 30.5 CM DIAMETER RIGID PLATE ARE PROGRAMMED TO ESTIMATE THE BEHAVIOR OF PAVEMENTS AND TO OBTAIN QUALITATIVE INFORMATION BOTH ON COEFFICIENTS OF RELATIVE STRENGTH FOR PAVEMENT MATERIALS AND ON AXIAL LOAD EQUIVALENCY FACTORS FOR REGIONAL CONDITIONS. SOME OF THE MATHEMATICAL MODELS DEVELOPED BY THE AASHO ROAD TEST HAVE BEEN FOUND USEFUL FOR RESEARCH.

  • Supplemental Notes:
    • No I-12, pp 2-27, 11 FIG, 5 TAB, 47 REF, 2 APP
  • Authors:
    • Caballero, S C
    • Menchaca, L M
  • Publication Date: 1967

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  • Accession Number: 00205522
  • Record Type: Publication
  • Files: TRIS
  • Created Date: May 24 1994 12:00AM