Evaluation of the IDEAL-CT for Hveem-Designed Asphalt Mixtures in Nevada
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Authors
Mahenthiran, Buveenthiran
Issue Date
2025
Type
Thesis
Language
en_US
Keywords
Alternative Title
Abstract
This study focuses on evaluating the applicability and effectiveness of the Indirect Tensile Asphalt Cracking Test (IDEAL-CT) for Hveem designed asphalt mixtures in the State of Nevada. While IDEAL-CT has traditionally been applied to Superpave Gyratory Compacted (SGC) specimens; this study investigates its use with Hveem-compacted specimens, highlighting adaptations for smaller diameters. The sensitivity of the CT Index to changes in mix design parameters, such as aggregate gradation and asphalt binder content, was evaluated, and results were compared between Hveem and SGC compaction methods.Findings indicate that both specimen diameter and compaction method influence the IDEAL-CT test parameters, with differing effects on cracking performance. The study also explored the use of IDEAL-CT on Hveem-compacted specimens to determine the tensile strength for moisture damage evaluation in accordance with AASHTO T 283 (tensile strength ratio, TSR). In addition, the Moisture Induced Stress Tester (MiST) was examined as a potential alternative for the freeze-thaw cycle of moisture-conditioned specimens.
As an initial attempt to validate the CT Index for Nevada conditions, the LTPP SPS-10 project was used as a case study. Field core samples collected at different in-service periods within the first two years of pavement life, along with plant-produced asphalt mixtures, were tested for the CT Index. Field distress data for cracking were obtained from LTPP InfoPave and analyzed for potential correlations with the laboratory results. Limited cracking distress was observed during the early years following construction, which limited the comparison with core test results.