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Volume 49, Issue 6 (March 2021)
“Simplified” Cracking Tests: Evaluation of the IDEAL-CT Performed Using a Marshall Testing Platform
(Received 16 September 2020; accepted 30 November 2020)
Published Online: 16 March 2021
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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.
Castillo-Camarena, Elvis A. Department of Civil Engineering, University of Arkansas, Fayetteville, AR
Facultad de Ingeniería Civil, Universidad Tecnológica de Panamá, Campus Victor Levi Sasso, Edificio 1, Vía Centenario, Ancón, Ciudad de Panamá,
Hall, Kevin D.
Department of Civil Engineering, University of Arkansas, Fayetteville, AR
Stock #: JTE20200578
Title “Simplified” Cracking Tests: Evaluation of the IDEAL-CT Performed Using a Marshall Testing Platform