PAVEMENT DEFLECTIONS FROM LABORATORY TESTS AND LAYER THEORY

AN ATTEMPT WAS MADE TO INTERPRET THE RESULTS OF IN-SITU DEFLECTION MEASUREMENTS ON A THEORETICAL BASIS FOR MOVING LOADS UNDER WHICH THE PAVEMENT RESPONSE IS ESSENTIALLY ELASTIC, AND TO SOME EXTENT FOR STATIONARY LOADS UNDER WHICH THE PAVEMENT RESPONSE IS A COMPLEX FUNCTION OF TIME- DEPENDENT STRESSES AND STRAINS. TESTS WERE PERFORMED ON EACH MATERIAL OVER THE RANGE OF TEMPERATURE OF DENSITIES AND MOISTURE CONTENTS EXPECTED IN THE FIELD. FOR FIELD DEFLECTION DATA, REFERENCE RESINS WERE PLACED IN THE PAVEMENT AT NINE LOCATIONS AND PERIODIC MEASUREMENTS MADE DURING 1964 AND 1965. RESULTING CALCULATED AND MEASURED DEFLECTIONS ARE COMPARED. IT IS CONCLUDED THAT IN TRANSLATING FROM LABORATORY TESTS TO MOVING VEHICLES THE CONCEPT OF FREQUENCY SATISFACTORILY EXPLAINS THE EFFECT OF VARIATIONS IN DEFLECTIONS WITH VARIATION IN VEHICLE SPEED USING THE CONCEPTS OF THE LAYER ELASTIC THEORY. WITH THESE CONCEPTS THE MAGNITUDE OF MAXIMUM DEFLECTION DIFFERENCE CAN BE CALCULATED WITH CONFIDENCE WITHIN THE LIMITATIONS OF THE BOUNDARY, LOADING AND MATERIAL CONDITIONS ASSUMED. WITHIN THESE CONCEPTS AND ASSUMPTIONS, THE MAGNITUDE OF THE CALCULATED LONGITUDINAL DEFLECTION PROFILE IS A FUNCTION OF THE IMMEDIATELY PRECEDENT LOADING AND MAY BE CALCULATED WITH SOME CONFIDENCE FOR NORMALLY OPERATING VEHICLES.

• Supplemental Notes:
  • Preprint, pP 664-708, 31 FIG, 14 TAB, 6 REF, 6 APP
• Authors:
  • Coffman, B S
• Conference:
  • Intl Conf Struct Design Asphalt Pvmts
• Publication Date: 1967-8

Subject/Index Terms

• TRT Terms: Calculation; Deflection; Deflection tests; Density; Dynamic loads; Elasticity (Mechanics); Field tests; Laboratory tests; Measurement; Moisture content; Motion; Motor vehicles; Pavements; Speed; Static loads; Temperature
• Uncontrolled Terms: Computation; Moving vehicles
• Old TRIS Terms: Elastic theory; Insitu methods; Layered theories; Pavement deflection
• Subject Areas: Highways; Pavements;

Filing Info

• Accession Number: 00206726
• Record Type: Publication
• Files: TRIS
• Created Date: May 21 1994 12:00AM