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Edition:Progress rept. no. 1.
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Abstract:Deflection tests conducted on eight sections of primary highway, both before and after asphaltic concrete resurfacings, were analyzed as a study of the utility of such tests in the design of overlays. The application of tentative traffic and allowable deflection criteria showed that seven of the eight projects had deflections reduced to a satisfactory level by overlays of from 125 to 220 psy. It is likely that maintenance engineers would find deflection tests useful as decision making tools where the underlying pavement structure is unknown or of questionable quality. Other uses could include the definition of weight limits where unusual traffic or weather conditions prevail. It is recommended that the Research Council, in cooperation with the Maintenance Division, proceed with the development of an overlay design procedure which would include well defined traffic and structural parameters.
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