Nondestructive Testing for Light Aircraft Pavements. Phase II. Development of the Nondestructive Evaluation Methodology.
Final rept. Aug 79-Aug 80,
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS GEOTECHNICAL LAB
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This study is the second phase of a two-phase program to develop a nondestructive pavement evaluation method to evaluate pavements designed to support aircraft with gross weights of less than 30,000 lb. A method that uses the deflection basin from nondestructive testing NDT to predict the elastic moduli of up to four pavement layers was developed. A computer program CHEVDEF was developed that predicts the moduli so that the deflection basin from a layered elastic solution approximates the measured basin. The nonlinear stress-dependent characteristics of the subgrade are defined. Moduli derived from NDT results are used in the PAVEVAL program developed in FAA-RD-77-186-I by R. A. Weiss to predict the allowable aircraft loads. The subgrade elastic moduli described by this method compares well with laboratory test results and with results from other methodologies. The predicted allowable load from this method compares well with the allowable load from the dynamic stiffness modulus procedure. Appendices present a laboratory procedure for determining the resilient modulus of subgrade soils, discuss the CHEVDEF program, and provide a guide to the use of the PAVEVAL computer program.
- Civil Engineering