Journal Published Online: 16 March 2021
Volume 49, Issue 6

“Simplified” Cracking Tests: Evaluation of the IDEAL-CT Performed Using a Marshall Testing Platform

CODEN: JTEVAB

Abstract

In considering the implementation of a cracking test for asphalt mixes, attention should be given to both the accuracy and the practical implications of equipment cost and ease of use. This study evaluated the applicability of the indirect tensile asphalt cracking test (IDEAL-CT) performed using a Marshall frame with an in-house-assembled data acquisition instrumentation, compared with the Illinois flexibility index test (I-FIT) protocol using a modern asphalt materials performance test (AMPT). Both flexibility index (FI) and cracking resistance index (CRI) values were obtained from the I-FIT tests. Mixes representing five in-service pavements exhibiting different levels of cracking performance are included. Despite an unstable (and out of specification) loading rate on the Marshall testing frame, IDEAL-CT test results compared favorably with those of the I-FIT performed on the AMPT. The CTIndex exhibited less variability than the FI but more variability than the CRI. The CTIndex appears to discriminate cracking-related behavior in a manner consistent with the FI and CRI. This study indicates the potential for using the IDEAL-CT on a Marshall frame—offering laboratories potentially significant savings in both equipment and specimen preparation costs.

Author Information

Castillo-Camarena, Elvis A.
Facultad de Ingeniería Civil, Universidad Tecnológica de Panamá, Campus Victor Levi Sasso, Edificio 1, Vía Centenario, Ancón, Ciudad de Panamá, Panamá Department of Civil Engineering, University of Arkansas, Fayetteville, AR, USA
Hall, Kevin D.
Department of Civil Engineering, University of Arkansas, Fayetteville, AR, USA
Pages: 10
Price: $25.00
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Stock #: JTE20200578
ISSN: 0090-3973
DOI: 10.1520/JTE20200578