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Title:

DYNAMIC ANALYSIS OF ASPHALTIC-AGGREGATE MIXTURES

Accession Number:

00148655

Record Type:

Component

Availability:

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Order URL: http://worldcat.org/isbn/0309025648

Abstract:

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.

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.

Monograph Accession #:

01411128

Authors:

Stephenson, Richard W

Pagination:

pp 34-40

Publication Date:

1976

Serial:

Transportation Research Record

Issue Number: 595
Publisher: Transportation Research Board
ISSN: 0361-1981

ISBN:

0309025648

Media Type:

Print

Features:

Figures (9) ; References (5)

Uncontrolled Terms:

Attenuation; Wave velocity

Old TRIS Terms:

Subject Areas:

Highways; Materials

Files:

TRIS, TRB

Created Date:

Mar 30 1977 12:00AM

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