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Find a library where document is available.The results indicate that the cracking and cement-treated base crushing in the asphalt pavement may result in an abnormal deflection basin and make the backcalculated modulus incorrect therefore, it may be necessary to remove the unusual deflection basin before the backcalculation to obtain accepted backcalculation results, or decrease the number of structural layers to reduce the unreasonable backcalculation results. Then the effect of the distresses was investigated on the deflection basin and the backcalculation modulus. There is substantial synergy in combining the analysis capabilities of both systems. The modulus of the structural layers and subgrade was backcalculated from the FWD data using the MODULUS 6.0 program. The GPR data are processed with the COLORMAP analysis system, and the FWD data are processed with MODULUS 6.0. In this study, the finite element method (FEM) was used to simulate the asphalt pavement with and without the distresses and the FWD load, and thus produce the defection data. It is necessary to investigate the effect of the distresses on the deflection basin and the backcalculation modulus. The FWD test has sometimes been performed on asphalt pavement with distresses. BACKCALCULATION OF LAYER MODULI OF GRANULAR LAYERS FOR BOTH RIGID AND FLEXIBLE PAVEMENTS By Ashvini Kumar Thottempudi The resilient moduli (MR) of surface, base and subbase pavement layers and that of the roadbed soil are primary design input parameters to all pavement design software. The Falling Weight Deflectometer (FWD) is widely used to evaluate the asphalt pavement structural conditions through the deflection basin and the backcalculation modulus. Effect of Distresses on Deflection Basins and Backcalculation Modulus of Asphalt Pavement with Cement-Treated Base