APA Rut Testing Evaluation

Principal Investigator:

Gene Skok, Former University Researcher, Civil, Environmental and Geo-Engineering

Project Summary:

During the 1980's the Georgia loaded wheel device was developed. The Asphalt Pavement Analyzer was developed in 1996 as an up-dated version of the Georgia loaded wheel device. It is a multifunctional loaded device, which can be used to evaluate permanent deformation (rutting), fatigue cracking and moisture susceptibility. This research considers the Asphalt Pavement Analyzer (APA) as a tool for evaluating the rutting susceptibility of Minnesota Hot Mix Asphalt (HMA). Its authors analyze the 25 responses to a questionnaire sent to members of the APA Users' Group and conduct a literature review. Based on this evidence, they recommend that Mn/DOT purchase an APA. The tool provides a measure of rutting susceptibility; is reasonably reliable and repeatable; and has been used by over 60 agencies and contractors. In addition, procedures for conducting tests are available in ASTM and AASHTO formats and the Users' Group provides a forum for discussion and support.

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