The Indiana Department of Transportation (INDOT) Central Hot Mix Asphalt (HMA) Acceptance Lab was opened on March 29, 2018, at the Office of Materials Management (OMM) facility in Indianapolis. The state-of-the-art lab conducts acceptance testing on HMA samples from INDOT’s Crawfordsville and Greenfield districts, as well as testing of appeals samples from the other four INDOT districts. Each HMA sample undergoes multiple sequences acceptance testing processes. INDOT’s standard metric is for these tests to be completed and reported in six days. Overall average performance in 2018 met this target (4.66 days for Crawfordsville, 4.99 days for Greenfield), however, turnaround time exceeding this target during months of peak demand. The goal of this project was to improve organization, flow of work and efficiency in the central region HMA Acceptance Lab for all tests done, with implementation leading to reduction of turnaround time from 6 days to 4 days. Note that the scope of this project only included the samples from the Crawfordsville and Greenfield districts. It did not include appeals or other special testing that the lab may conduct.

Report Number



HMA lab, methodology, stone matrix asphalt, SMA, technicians, extraction

SPR Number


Performing Organization

Joint Transportation Research Program

Publisher Place

West Lafayette, IN

Date of this Version


SPR-4353 Technical Summary.pdf (929 kB)
VSM--INDOT HMA 2020-03-02.vsd (19282 kB)
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