Improving DMS 9210 requirements for limestone rock asphalt - final report.
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2015-03-01
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Abstract:Limestone Rock Asphalt (LRA) mixtures have been produced and placed for several decades using
specification requirements currently listed under DMS 9210. Several districts have had placement issues
and premature failures at the beginning of 2010. These issues and failures have been attributed to material
properties. Requirements for DMS 9210 have not changed for several years and need to be evaluated to
possibly produce a higher quality material to reduce the occurrence of premature failures and to minimize
placement issues. The objectives of the study are to (1) evaluate specification requirements of Item 330 and
DMS 9210, (2) conduct field evaluations and lab testing to determine workability and acceptability as
stockpile material for use as needed in pavement maintenance, and (3) consider improvements to the
specification requirements to ensure an acceptable and workable stockpile material for up to 6 months.
The Hveem stability was determined to be a good indicator of rutting resistance of LRA but it does not
indicate when a mix is too dry and susceptible to raveling. The Cantabro test was able to identify dry
mixtures with insufficient flux oil as well as poor quality flux oil.
A Cantabro loss of 15 percent maximum is being proposed as a new specification test and limit
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