ISSN: 1945-7553
CODEN: JTEVAB
Page Count: 9

Specimen Instrumentation Techniques for Permanent Deformation Testing of Asphalt Mixtures

Kaloush, KE
Assistant professor, assistant professor of research, and professor, Arizona State University, Tempe, AZ

Mirza, MW
Assistant professor, assistant professor of research, and professor, Arizona State University, Tempe, AZ

Uzan, J
Professor, Technion, Israel Institute of Technology, Haifa,

Witczak, MW
Assistant professor, assistant professor of research, and professor, Arizona State University, Tempe, AZ

(Received 19 January 2001; accepted 16 April 2001)

Abstract

This paper presents research efforts undertaken to develop, evaluate, and recommend proper laboratory specimen instrumentation and preparation techniques. The instrumentation was intended specifically to capture test parameters in permanent deformation tests for asphalt mixtures. The study evaluated axial deformation measurements and test parameters using the traditional clamps compared to on-specimen glued studs, both being holding devices for linear variable differential transformers (LVDTs). Sawed, “as compacted,” and capped specimen end conditions were also compared. The test results for specimens using clamps and/or capped ends indicated that the specimens were being restrained from deforming freely during the test. In addition, the permanent deformation parameters from both instrumentation types (clamps versus glued studs) were substantially different. The recommendation for permanent deformation testing of asphalt mixtures is to use the instrumentation setup with glued studs and sawed specimen ends with thin lubricated membranes at the ends to insure frictionless surface conditions.

Keywords:
permanent deformation testing, instrumentation and preparation techniques, clamps, glued studs

Paper ID: JTE12272J
DOI: 10.1520/JTE12272J
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