Measuring and testing – Tire – tread or roadway – Tire inflation testing installation
Patent
1996-07-02
1997-03-25
Williams, Hezron E.
Measuring and testing
Tire, tread or roadway
Tire inflation testing installation
73 8, E01C 2300
Patent
active
056146701
ABSTRACT:
A device and method for monitoring conditions associated with pavement deterioration are disclosed. Conditions such as voids or loss of support under a rigid pavement, moisture infiltration in asphalt concrete pavement, fine cracking in pavements, delamination of overlays, and aging of asphalt may be measured according to the present invention. These pavement conditions are detected by estimating Young's and shear moduli in the pavement, base, and subgrade from the following wave propagation measurements: Impact Echo; Impulse Response; Spectral Analysis of Surface Waves; Ultrasonic Surface Wave; and Ultrasonic Body Wave Velocity. The pavement response produced by high- and low-frequency pneumatic hammers on five accelerometers and three geophones is recorded. A computer controls data acquisition, instrument control, and interpretation; measurements and interpretations are reported in both screen and database formats.
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A photograph of a first pre-prototype of the device exhibited at the AASHTO Annual Meeting in Milwaukee, Wisconsin in Oct., 1991.
Baker Mark R.
Crain Kevin
Nazarian Soheil
Board of Regents , The University of Texas System
Felber Joseph L.
Williams Hezron E.
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