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In earlier studies by the Rigid Pavement Laboratory, of field bearing tests applied to pavement design, only slight consideration was given to the effects of repetitions of low pressure loads. Bearing values based upon deformations under increments of a single loading cycle were considered adequate. However, later investigations have indicated that soil behavior under subsidence caused by numerous repetitions of low-pressure loads will require a revision of the bearing-test procedure to evaluate correctly values on the basis of progressive soil deformation.
This paper discusses a revision of the field bearing-test procedure and shows how its application may permit refinements in airfield-pavement design to the extent of considering the effects of repetitive loads which occur on taxiways, longtime static loads such as occur on hardstanding areas, and quick loads of very short duration which occur on runway pavements as aircraft either land or take off.
Philippe, Robert R.
Engineer, Technical Director, Corps of Engineers, U. S. Army, Mariemont, Ohio