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- W631921975 abstract "This report examines the procedures currently being used for evaluating an asphalt concrete mixture and evaluates the suitability of replacing current procedures with newer equipment and procedures. Current test requirements call for the asphalt content and gradation to be dtermined for comparison with specifications to certify the level of quality in the mixture. Newer techniques include the nuclear asphalt content (NAC) gauge, the use of biodegradable solvents, and determination of gradation from cold feed testing. The evaluation of State experience and State special studies, and analysis of raw data collected by various State agencies provided supporting data that show the NAC gauge can be substituted for traditional extraction tests for asphalt content determination, when properly calibrated for each mixture being produced. Several of the new biodegradable solvents, not all, can be substituted directly for traditional solvents to provide the same level of accuracy in asphalt content determination when special procedures are adopted to ensure proper accountability of fines removed during rinsing operations. The use of the biodegradable solvents did not produce a consistently different gradation when the appropriate procedures were used to ensure complete rinsing of the new solvent and accounting for the fines removed during rinsing. It is recommended that the biodegradable solvents be used in conjunction with the NAC gauges to provide a more economical means of evaluating an asphalt concrete mixture. A number of studies examining cold feed determination indicate that the cold feed gradations are as accurate, and no more variable than the determination of gradation from the truck or road. The durability of the aggregate can alter this if it degrades during production, producing a different gradation on the roadway." @default.
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- W631921975 date "1990-06-01" @default.
- W631921975 modified "2023-09-26" @default.
- W631921975 title "ASPHALT CONTENT DETERMINATION MANUAL. FINAL REPORT" @default.
- W631921975 hasPublicationYear "1990" @default.
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