Trr No. 1293 Pavement Design, Management, And Performance
A convergence method based on the use of nonlinear least squares is described. The method was adapted to a layered elastic program (CHEVRON N-layer). This convergence approach improves moduli estimates over prior procedures; however, the most important element is the ability to efficiently backcalculate not only layer moduli but also layer thicknesses. This abilitv is illustrated by using hypothetical twoand three-layer pavement sections and b_v using real data for a three-laver section