LOCKBOURNE NO. 1 - TEST TRACK, ACCELERATED TRAFFIC TESTS OF CONCRETE PAVEMENTS
OHIO RIVER DIV LABS MARIEMONT
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The purpose of the investigation was to study the behavior of full scale 6, 8, and 10-inch concrete pavement slabs on different subgrades and bases under 20, 37, and 60 thousand pound wheel load accelerated traffic, as well as a limited number of overlay and steel reinforced concrete slab designs under the same loadings. The principal objectives which have been answered within the limitation of the tests were to check the method of design outlined in the Engineering Manual, March 1943 edition, to study the effects of types of subgrade, type and thickness of granular base course, type and spacing of joints, and the use of steel reinforcement in concrete pavements, and to study the behavior of concrete overlays under traffic loading. Prior to and during traffic, deflection measurements at the interior, edge, and corner of the test slabs were made under moving and stationary wheel loads by means of the Woodman type electrical gage and mechanical extensometers. Also, at intervals during traffic, cracks and other types of pavement failures were recorded by plotting and photographs. A continuous temperature record during traffic was obtained in the top, middle, and bottom of selected test slabs by thermohms installed during construction.
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