00203106

Component

http://onlinepubs.trb.org...ubs/hrr/1964/46/46-002.pdf

A DESCRIPTION IS GIVEN OF NEWLY DEVELOPED LIGHT EQUIPMENT FOR VIBRATION TESTING OF ROAD CONSTRUCTIONS. SINUSOIDAL LOADING IS PRODUCED BY MEANS OF AN ELECTRODYNAMIC VIBRATOR EXERTING VERTICAL FORCES ON THE SURFACE OF THE ROAD OR LAYER UNDER TEST. THE EQUIPMENT, MOUNTED ON A SPECIAL TRAILER, IS EXTREMELY FLEXIBLE FOR APPLICATION TO THIS TYPE OF TEST AND PERMITS RELIABLE RESULTS TO BE OBTAINED UNDER A WIDE VARIETY OF CONDITIONS. TWO TYPES OF TEST HAVE BEEN CARRIED OUT' IN THE IMPEDANCE METHOD, THE RATIO OF FORCE TO RESULTANT VELOCITY IS MEASURED IN AMPLITUDE AND PHASE; IN THE WAVE PROPAGATION METHOD, WAVELENGTHS ALONG THE SURFACE ARE DETERMINED. TESTS ARE CARRIED OUT OVER A FREQUENCY RANGE FROM 10 C/S TO 500 C/S IN THE IMPEDANCE METHOD AND UP TO 1,000 C/S IN THE WAVE PROPAGATION METHOD. MEASUREMENTS HAVE BEEN CARRIED OUT ON AN EXPERIMENTAL ROAD IN WHICH WIDELY VARYING TYPES OF CONSTRUCTION HAD BEEN INCLUDED. FROM THE IMPEDANCE MEASUREMENTS IT WAS POSSIBLE TO ASCRIBE DYNAMIC PARAMETERS TO EACH LAYER OF THE CONSTRUCTION AND, FROM THESE, STRESSES AT VARIOUS DEPTHS; AND ENERGY LOSSES IN THE VARIOUS LAYERS HAVE BEEN CALCULATED. THE POTENTIALITIES OF VIBRATION TESTING IN THE CONTROL, DESIGN AND EVALUATION OF ROAD CONSTRUCTIONS ARE BRIEFLY REVIEWED. /AUTHOR/

Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.

01410013

Thrower, E N; Jones, R; Szendrei, M E; Kuhn, S H

pp 11-42

1964

Highway Research Record

Digital/other

Figures (25) ; References (12) ; Tables (8)

Construction management; Electrical impedance; Evaluation; Force; Loads; Measuring instruments; Mechanical impedance; Methodology; Pavement design; Pavement performance; Pavements; Paving; Ratios; Sine curves; Testing; Velocity; Vibration; Vibratory equipment

Loading

Construction; Design; Highways; Pavements

TRIS, TRB

Oct 28 1994 12:00AM

• A MODIFICATION OF THE AASHO ROAD TEST SERVICEABILITY INDEX FORMULA
• A NEW METHOD OF TRAFFIC EVALUATION FOR PAVEMENT DESIGN
• CAN DYNAMIC TIRE FORCES BE USED AS A CRITERION OF PAVEMENT CONDITIONS?
• COMPUTATION OF TRUE HIGHWAY ELEVATIONS FROM AN ELEVATION PROFILOMETER RECORD
• EVALUATION OF PAVEMENT PERFORMANCE RELATED TO DESIGN, CONSTRUCTION, MAINTENANCE AND OPERATION
• PORTLAND CEMENT CONCRETE AIRPORT PAVEMENT PERFORMANCE IN CANADA
• PRINCIPLES OF SUBJECTIVE RATING SCALE CONSTRUCTION
• SOME RECENT DEVELOPMENTS IN WORK ON SKIDDING PROBLEMS AT THE ROAD RESEARCH LABORATORY