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2019-08

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The objective of this study was to evaluate selected ODOT mixtures to assist with determining test procedures, specifications and special provisions for evaluation and eventual adaptation of a BMD procedure for ODOT. The test plan was developed by ODOT and consisted of evaluating I-FIT test results from 31 existing mixes and I-FIT and Ideal CT Index tests from nine mixes from three ODOT projects. The nine mixes consisted of three control mixes and six BMD mixes. Testing was performed by ODOT and a consultant laboratory on plant produced field sampled materials. There were inconsistent results from the testing within and between the data sets. BMD mixes differed from control mixes by the addition of RAP, increased VMA and increased asphalt content. Many ofthese high VMA BMD mixes collapsed in the field resulting in void properties below specification limits.

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