DYNAMIC ANALYSIS OF ASPHALTIC-AGGREGATE MIXTURES
Ultrasonic probes have been constructed for use in dynamic nondestructive testing of asphaltic concrete specimens. Use of the probe systems was superior to use of their main components alone, the piezoelectric crystals. The probes have the advantages of reducing ringing time, concentrating ultrasound in one direction, elimination of noise due to unshielded connections, and increased durability. The probes were used in a limited testing program. Compression and transverse wave velocities in the specimens tested were measured simultaneously. Sample conditions suitable for maximum wave velocity corresponded to conditions producing maximum strength and minimum voids in the mineral aggregate. A relationship of increasing wave velocity with increasing strength was noted. Wave velocity was observed to increase as the percentage of voids in mineral aggregate decreased. Various elastic constants were calculated from the wave velocities measured. Maximum values of E and G moduli as well as Poisson's ratio corresponded to minimum voids of the test specimens. Relative attenuation measurements were conducted by using water as a standard material. An evaluation of relative attenuation with changes in asphalt content indicated maximum damping at asphalt contents associated with high stability values.
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Availability:
- Find a library where document is available. Order URL: http://worldcat.org/isbn/0309025648
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Supplemental Notes:
- Publication of this paper sponsored by Committee on Characteristics of Bituminous Paving Mixtures to Meet Structural Requirements. 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.
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Authors:
- Stephenson, Richard W
- Publication Date: 1976
Media Info
- Media Type: Print
- Features: Figures; References;
- Pagination: pp 34-40
- Monograph Title: Asphalts, aggregates, mixes and stress-absorbing membranes
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Serial:
- Transportation Research Record
- Issue Number: 595
- Publisher: Transportation Research Board
- ISSN: 0361-1981
Subject/Index Terms
- TRT Terms: Aggregate mixtures; Asphalt concrete; Asphalt mixtures; Compliance constant; Dynamic tests; Nondestructive tests; Probes (Measuring devices); Ultrasonic tests; Wave motion
- Uncontrolled Terms: Attenuation; Wave velocity
- Old TRIS Terms: Probes
- Subject Areas: Highways; Materials;
Filing Info
- Accession Number: 00148655
- Record Type: Publication
- ISBN: 0309025648
- Files: TRIS, TRB
- Created Date: Mar 30 1977 12:00AM