United States Department of Transportation
i
Inter-Laboratory Study (ILS) of Bituminous Concrete Balanced Mix Design (BMD) Tests for Use on VTrans Projects
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2024-10-31
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[PDF-2.11 MB]
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Edition:Final Report 2022-2023
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Abstract:Many state departments of transportation across the US are in various stages and levels of implementation of performance testing for Balanced Mix Design (BMD). The tests are intended to provide data to the designer with the goal of developing a mix design that balances adequate resistance to rutting and stripping with resistance to thermal and stress cracking. The objective of this Inter-Lab Study (ILS) was to determine the variability between eleven (11) different laboratories in the region using typical testing methods included as part of Balanced Mix Design (BMD) procedures including AASHTO T 324 Hamburg Wheel-Track Test (HWTT), the AASHTO T 393-21 Illinois Flexibility Index Test (I-FIT), and the ASTM D8225-19 Indirect Tension Asphalt Cracking Test (IDEAL-CT). To ensure the consistency of samples used in this study, all specimen sampling, compaction and sample preparation were undertaken by a single lab (the UConn CT Advanced Pavement Lab). The aforementioned BMD testing methods were then conducted across multiple machines and operators from various laboratories/agencies to establish minimum variabilities expected across a single sample for these tests.
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