NEW GUIDELINES FOR MATERIALS CHARACTERIZATION OF IN-SERVICE RIGID PAVEMENTS

In this paper, the derivation of expressions for computing the number of deflection measurements required for materials characterization of in-service rigid pavements is presented. Both a normal and a Student's t distribution are considered in the analysis and comparisons are made between estimates resulting from both approaches. Guidelines are provided for estimating the number of deflection measurements for rigid pavements based on findings emanating from this study. Figures are also presented as an alternate method for determining deflection sample size. Deflections measured near the pavement edge are influenced by the temperature gradient in a concrete slab. A method is proposed that predicts temperature in the concrete slab in order to apply a suitable temperature correction.