Practical Approaches to Hot-Mix Asphalt Mix Design and Production Quality Control Te

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Practical Approaches to Hot-Mix Asphalt Mix Design and Production Quality Control Testing

Author: TRB | Size: ~2 MB | Format: PDF | Publisher: TRB | Year: 2007 | pages: 84

Since the introduction of the Superpave mix design procedure, there has been considerable
research to refine the design procedure so that laboratory tests and procedures used during
the hot-mix asphalt (HMA) mix design process relate better to actual field performance. Also, a
number of agencies have been concerned with the lack of a proof test for validating the
volumetric properties. Many have expressed a desire for a truly simple mix test that could be
employed at the HMA plant lab level.

These issues were explored in a workshop at the 85th Annual Meeting of the
Transportation Research Board (TRB). The papers in this document were written following the
workshop and are based on the presentations; the papers have not undergone a formal peer
review.

The first paper offers a state-of-the-practice for Superpave mix design and specification,
which is based on an in-depth survey of the regional User–Producer Groups. It includes a
summary of changes made to the Superpave mix design procedure as a result of NCHRP
research findings, Expert Task Group/American Association of State Highway and
Transportation Officials (ETG/AASHTO) recommendations, and individual state experience.

The remaining papers deal with other tools for mix design and evaluating HMA during
production that are relatively simple and implementable. This includes such things as the Bailey
method of gradation evaluation, use of the Superpave gyratory compactor to assess performance,
and use of the locking point to establish NDesign. In addition, other mix tests that show some
potential as practical tools for use in the verification of mix designs and the quality control of
HMA production are offered. These changes and new tools are intended to improve the field
performance of HMA.

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