The Influence of the Interface Friction Coefficient on Composite Concrete Pavement Performance

Paper by AL HAKIM AL NAGEIM POUNTNEY from ISCR 7th 1994 Vienna Austria

The paper discusses the role of non-destructive testing in pavement evaluation and the importance of bonding between its layers on back-calculated properties. Rigid composite pavement structures were analysed using the BISAR programme under different bonding coefficients (ks) between the asphalt and the concrete layers. The results indicate that: A small amount of debonding reduced the back-calculated moduli of the top and second layers in average by 20% and 8% of full adhesion case rospoctivoly. Deflections are very sensitive to the interface condition for the values of k between 1 0 and 10.2 m3/MN. Therefore the use of the interface friction coefficient in a fundamental back-analysis method allows for a more accurate calculation of the remaining life of the pavement, analysis of the causes of its failure, and more importantly, can be used as a quality control during construction and overlaying.

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