Moduli of unbound materials

The parameters describing the moduli of unbound materials as a function of the bending stiffness of the materials above the layer, and as a function of the load level, are given in the spreadsheet ModuliUnboundMaterial.xls.

The parameters in the spreadsheet are those defined by the equations:

In addition the spreadsheet may be used to evaluate the influence of the seasonal changes, given by:

E = Emean * (1 + ERange/2*sin(2p(Day – MaxDay)/365 + p/2))

and the influence of frost/thaw:

R = 1 - (1 - Ro) * exp(A * days since frost)