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Evaluation of joint and subbase efficiency in rigid pavement using nondestructive testing : final report.
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1991-01-01
[PDF-1.14 MB]
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Alternative Title:Evaluation of joint & subbase efficiency in rigid pavement using nondestructive testing.
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Abstract:The first phase of this study was undertaken to develop an inexpensive, easy-to-use non-destructive test procedure for evaluating the structural condition of transverse joints in concrete pavements. The test method consists of a load deflection measurement technique (18,000 pound single-axle load) in conjunction with a finite element model of the jointed slab system, called JSLAB. Time-deflection measurements were recorded over a variety of concrete pavement thicknesses, ages, and conditions. The process was determined to be very useful as an aid in making rehabilitation decisions for concrete joints. Deflection based guidelines are provided for concrete pavement rehabilitation decisions for joint replacement and for grinding and undersealing of faulted joints. The test method was sufficiently sensitive to characterize a roadbed soil conditioned with lime, and then treated with cement, as containing greater stiffness than soil (for the same pavement) that was lime conditioned only. The second phase was conducted to investigate the effectiveness of adding a bonded concrete overlay and tied shoulder to an existing CRC pavement with asphalt shoulder. In general, the addition of an overlay and tied shoulder reduced pavement deflections significantly. The test method used was similar to that in Phase I and included load deflection measurements in conjunction with the finite element program JSLAB.
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