ULTRASONIC MODULI OF ASPHALT CONCRETE

THERE HAS BEEN A NEED FOR A NONDESTRUCTIVE, DYNAMIC TECHNIQUE FOR EVALUATING CERTAIN ELASTIC CONSTANTS OF ASPHALT PAVING MATERIALS. IN THIS STUDY, A METHOD IS DEVELOPED BY WHICH THE DYNAMIC E-MODULUS, G-MODULUS, AND POISSON'S RATIO OF COMPACTED ASPHALT- AGGREGATE SPECIMENS ARE DETERMINED FROM MEASUREMENT OF THE PROPAGATION VELOCITIES OF PULSED ULTRASONIC SHEAR AND COMPRESSIONAL WAVES THROUGH THE TEST MATERIAL. THIS TEST PROCEDURE PROVED TO BE...