Crack Resistance and Durability of Ohio DOT Asphalt Mixtures Using I-FIT & IDEAL-CT: Phase 2
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2021-11-01
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Edition:Final Report
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Abstract:The primary objective of this research project was to assist the Ohio Department of Transportation (ODOT) in identifying a laboratory test that can be used to characterize the fracture behavior and cracking resistance of asphalt mixtures for potential incorporation into ODOT’s mix design approval and quality control/quality assurance (QC/QA) process. Two laboratory tests were evaluated for this purpose, namely the Illinois flexibility index test (I-FIT) and indirect tensile asphalt cracking test (IDEAL-CT). A laboratory testing plan was developed and implemented in this project that involved conducting both tests on a limited number of asphalt mixtures for screening purposes and selecting one of the two tests for full-scale evaluation using a larger number of asphalt mixtures representing the majority of asphalt mixtures used by ODOT. The screening evaluation revealed a high correlation between the I-FIT and IDEAL-CT test results. The I-FIT and IDEAL-CT test results also resulted in a similar ranking of asphalt mixtures in terms of resistance to cracking, which implies that each test can be used as a surrogate for the other. Several advantages were identified for the IDEAL-CT test that make it more favorable to use than the I-FIT test, including faster and easier sample preparation, applicability to asphalt mixtures containing larger aggregates, ability to achieve target air void level during compaction, availability of Excel spreadsheets to analyze test results, lower variation in test results, and familiarity of asphalt mix designers in Ohio with sample preparation and test procedure for conducting the IDEAL-CT test. Therefore, it was recommended to select the IDEAL-CT test for the full-scale evaluation. The laboratory test results from the full-scale evaluation revealed that the total asphalt content (%), percentage of RAP, blend absorption (%), and aggregate gradation represented using the percent passing 3/4” sieve are the most significant parameters affecting the cracking parameter obtained using the IDEAL-CT test.
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