United States Department of Transportation
i
A Practice for including Intelligent Construction Equipment in Quality Assurance Programs
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2023-01-12
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[PDF-1.13 MB]
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Edition:Final Report
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Abstract:Many State departments of transportation (DOTs) include density of the asphalt mat as a quality characteristic in their quality assurance (QA) programs. Density values are determined from point-specific laboratory tests. State DOTs desire real-time tests to evaluate asphalt mixture consistency and mat density across the entire width and length of a paving lot. Two innovative devices that have emerged for use in evaluating the uniformity and density of asphalt mixtures are the paver-mounted thermal profiler (PMTP) and the dielectric profiling system (DPS). Both technologies generate a significant amount of real-time data using hardware and software with spatial referencing sources. The DPS is used to test the asphalt mat after final rolling and is considered to be in the field demonstration stage or just entering the field pilot stage of research deployment. The PMTP is attached to the paver for monitoring the surface temperatures of the asphalt mat and is currently at the field pilot and specification development stage. A few State DOTs have deployed the PMTP in their QA program. A third innovative technology referred to as intelligent compaction (IC) is used to map roller coverage of the mat during construction and monitor relative mat stiffness during breakdown rolling. The IC technology is discussed in this report, but it is still considered to be in the initial field demonstration stage. This report provides information and suggestions for using intelligent construction equipment in a QA program conforming to 23 CFR part 637, subpart B. The document focuses on asphalt mat density and temperature for application in QA programs, but the information provided can be applied to other quality characteristics.
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