ISSN: 1945-7553
CODEN: JTEVAB
Page Count: 14

Dynamic Properties of Asphalt Concrete

Sousa, J
Assistant Research Engineer, and The Robert Horonjeff Professor of Civil Engineering and Research Engineer, The Institute of Transportation Studies, University of California, Berkeley, CA

Monismith, CL
Assistant Research Engineer, and The Robert Horonjeff Professor of Civil Engineering and Research Engineer, The Institute of Transportation Studies, University of California, Berkeley, CA

(Received 16 July 1987; accepted 30 November 1987)

Abstract

This paper describes equipment developed to determine the dynamic properties of paving materials in axial and torsional loading. Dynamic properties were determined by the excitation of hollow cylindrical specimens using two independent sinusoidal loads with frequencies up to 30 Hz.

An IBM PC/AT equipped with a Metrabyte DASH16 Data Acquisition Board was used to directly control two MTS Hydraulic Servorams. Menu-driven software was developed, taking advantage of DMA channels, so that data acquisition, waveform generation, and closed-loop control could simultaneously take place at rates above 5000 samples/s/channel. To convert raw data into graphs and parameters representative of dynamic material properties, a post-processing menu-driven program was also developed.

Dynamic properties for a dense-graded asphalt concrete are presented for a range in temperatures from 11 to 40°C and for a range in frequencies from 0.5 to 20 Hz. Test results include: dynamic moduli in axial loading defined by

Keywords:
asphalt concrete, dynamic elastic modulus, dynamic shear modulus, internal damping, dynamic Poisson's ratio, hollow cylindrical specimen, resilient modulus, computer-controlled test equipment

Paper ID: JTE11078J
DOI: 10.1520/JTE11078J
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