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    Practical Significance of Tests on Asphalt Cements

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    The practical significance of each of the usual tests for asphalt cements, and of their specification limits, is critically examined from the point of view of the highway or airport engineer who is responsible for the design, construction, and maintenance of asphalt surfaces. Based on the results of this review, it is recommended that specifications for asphalt cements should be limited to flash point by the Pensky-Martens closed tester; penetration at 77 F; ductility at either 77 F or 60 F; either loss on heating to 325 F, or the U. S. Bureau of Public Roads Thin Film Oven Test, but restricting tests on the residue in either case to penetration at 77 F; solubility in carbon tetrachloride; and statements requiring the asphalt supplier to provide the specific gravity 77/77 F and the viscosity temperature curve for each asphalt cement furnished under the specifications.

    Author Information:

    McLeod, Norman W.
    Asphalt Consultant, Imperial Oil, Ltd., Toronto, Ont.

    Committee/Subcommittee: D04.47

    DOI: 10.1520/STP47183S