TM 5-822-13/AFJMAN 32-1018
4-3 Nondestructive Testing Procedure.
When computer programs are used to compute the stresses and strains in a pavement, the input needed is the
elastic moduli of the pavement layers. The modulus values may be determined using the nondestructive testing
(NDT) procedure presented in TM 5-826-5/AFP 88-24, Chap. 5. The NDT procedure used in this manual is the
falling weight deflectometer (FWD). With the FWD the deflection basins of the pavement can be measured.
Based on the measured deflection basins, the elastic modulus of the pavement material in each layer can be
backcalculated by a computer program WESDEF available at US Army Engineer Waterways Experiment Sta-
tion (WES) (TM 5-826-5/AFP 88-24, Chap. 5).
4-7
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