United States Department of Transportation
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Concrete pavement mixture design and analysis (MDA) : application of a portable x-ray fluorescence technique to assess concrete mix proportions.
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2012-03-01
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NTL Classification:NTL-HIGHWAY/ROAD TRANSPORTATION-Pavement Management and Performance;NTL-HIGHWAY/ROAD TRANSPORTATION-Design;
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Abstract:Any transportation infrastructure system is inherently concerned with durability and performance issues. The proportioning and
uniformity control of concrete mixtures are critical factors that directly affect the longevity and performance of the portland cement
concrete pavement systems. At present, the only means available to monitor mix proportions of any given batch are to track batch
tickets created at the batch plant. However, this does not take into account potential errors in loading materials into storage silos,
calibration errors, and addition of water after dispatch. Therefore, there is a need for a rapid, cost-effective, and reliable field test that
estimates the proportions of as-delivered concrete mixtures. In addition, performance based specifications will be more easily
implemented if there is a way to readily demonstrate whether any given batch is similar to the proportions already accepted based on
laboratory performance testing.
The goal of the present research project is to investigate the potential use of a portable x-ray fluorescence (XRF) technique to assess the
proportions of concrete mixtures as they are delivered. Tests were conducted on the raw materials, paste and mortar samples using a
portable XRF device. There is a reasonable correlation between the actual and calculated mix proportions of the paste samples, but data
on mortar samples was less reliable.
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