A SUMMARY OF LOAD TRANSMISSION TESTS ON FLEXIBLE PAVING AND BASE COURSES

THE LOAD TRANSMISSION APPARATUS PROVIDES A MEANS OF CONDUCTING LOAD TESTS ON FULL-SCALE PAVEMENT SECTIONS UNDER LABORATORY CONDITIONS. A SEGMENTED LOADING PLATFORM SUPPORTED BY COIL SPRINGS IS SUBSTITUTED FOR THE NATURAL SUBGRADE TO INSURE CONSTANT TEST CONDITIONS OVER LONG PERIODS, AND TO PERMIT QUICK AND ACCURATE MEASUREMENT OF VERTICAL STRESSES TRANSMITTED THROUGH THE PAVEMENT. FOR A GIVEN APPLIED LOAD, THE MAXIMUM STRESS ON THE SUBGRADE PROVIDES A CONVENIENT MEANS OF COMPARING THE EFFICIENCIES OF VARIOUS PAVEMENT SECTIONS OR EVALUATING THE EFFECTS OF VARIOUS DESIGN VARIABLES. THE RELATIONSHIP OF SUBGRADE CONTACT AREA, AND RESPECTIVE STRENGTHS (OR STIFFNESSES) OF PAVEMENT AND SUBGRADE. AN ANALYSIS OF 814 LOADING TESTS ON 123 PAVEMENT SECTIONS VERIFIES THE ESSENTIAL CORRECTNESS OF THEORETICAL STUDIES AND PROVIDES NUMERICAL VALUES FOR USE IN DESIGN OR FOR FURTHER STUDY. THESE VALUES ARE GIVEN IN CHART FORM, AND REPRESENT A GENERALIZATION OF ALL PERTINENT TEST DATA. THEY MAY BE USED DIRECTLY IN A METHOD OF PAVEMENT THICKNESS DESIGN BASED ON A LIMITING SUBGRADE STRESS OR DEFLECTION, OR TO EXTEND EMPIRICAL DESIGNS INTO AREAS NOT ADEQUATELY COVERED BY SERVICE EXPERIENCE. THE TRIAXIAL TEST WAS USED TO COMPARE STRENGTHS OF THE VARIOUS MATERIALS (GRAVEL, CLAY-GRAVEL, SAND, LIMESTONE, SLAG, AND ASPHALTIC CONCRETE) USED IN THE PAVEMENT SECTIONS. ALTHOUGH FURTHER CORRELATION STUDIES ARE IN PROGRESS, THE METHOD OUTLINED IN THIS AND PREVIOUS PAPERS IS CONSIDERED ADEQUATE FOR DESIGN PURPOSES. THE VALIDITY OF THE TEST DATA FOR USE IN HIGHWAY PAVEMENT DESIGN WILL BE CHECKED BY CORRELATION WITH RESULTS OF TRAFFIC TESTS ON THE AASHO TEST ROAD. /AUTHOR/

Media Info

  • Monograph Title: Flexible pavement design: research and development 1958
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00205708
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Apr 28 1994 12:00AM