United States Department of Transportation
i
Determination of Fines Produced During Crushing, Handling, and Placement of Aggregates Employed in Roadway Construction Final Report
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1987-09-01
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[PDF-3.43 MB]
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TRIS Online Accession Number:00471878
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Abstract:The three part test procedure was developed to determine the quantity of fines produced during crushing, handling, and placement of aggregates used as base course in roadway construction. The results of the test series were compared to fines determined from field records for six aggregate sources in Alaska. These sources were associated with projects experiencing final fines contents in the roadway structure which exceeded that allowed by the State of Alaska. A comparison of the laboratory and field results indicates that the test series may overestimate the quantity of fines that is likely to be produced under normal field conditions. Presently, the three part test procedure can only be used as a conservative measure of the maximum quantity of fines that is likely to be produced for a given crushing, handling, and placement history. The nature and quantity of the fines created in the laboratory test series were analyzed in order to determine their contribution to the frost action susceptibility of a representative base course aggregate. The fines produced are predominantly in the coarse-silt (0.02 to 0.074 mm) size range. Current frost action susceptibility theories suggest that these fines alone should not render the base course aggregate frost susceptible, but fines present before crushing in combination with those produced in processing may prove to be detrimental to roadway structure performance.
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