Concrete Pavement Joints, Measurement of Deflection and Slab Rocking, Development of Load Transfer Device

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Title: Concrete Pavement Joints, Measurement of Deflection and Slab Rocking, Development of Load Transfer Device

Author(s): Reinard W. Brandley

Publication: Special Publication

Volume: 70

Issue:

Appears on pages(s): 719-734

Keywords: concrete pavements; concrete slabs; deflection; failure; joints (junctions); loads (forces); load tests (structural); load transfer; measurement; resurfacing; runways.

Date: 1/1/1981

Abstract:
The only runway at San Diego International Airport, SanDiego, California, is of World War II vintage, consisting of Portland Cement Concrete (PCC) pavement placed on a dredged fill. Failure of this pavement under load has progressed to a point where rehabilitation and/or strengthening is necessary. Early observations indicated that poor performance of the joints in the Portland Cement Concrete pavement was largely responsible for the failures which had occurred. There was evidence of large total deflection of the joint and of large movement of one slab with respect to the adjoining slab (slab rocking) under heavy loading conditions. A new deflection beam was developed, and total deflection and slab rockinq under load was measured for all critical joints on the runway pavement. All joints which showed excessive total deflection were grouted, and all joints which showed excessive slab rocking were treated with a new design of load transfer device. An 8-in. bituminous surface course was placed as a strengthening overlay. Joints were sawed and sealed in the bituminous surface course to match the PCC joints to control reflective cracking. Tests conducted subsequent to construction show that the rehabilitated pavement joints have performed well.