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Relative Quality of Roadbed Soil
Iowa Soil Type
CBR
Resilient Modulus, psi
Effective Resilient Modulus, psi
k-value (psi/in)
Losss of Support k-value (psi/in)
Select
7
8,877
6,776
nformation
nformation
Suitable
5
7,157
5,482
Unsuitable
3
5,161
3,965
*For resilient modulus calculation, the following equation was used:
From: Guide for Mechanistic-Empirical Design of New and Rehabilitated Pavement Structures, APPENDIX GG-1 pg. GG 1.52
http://onlinepubs.trb.org/onlinepubs/archive/mepdg/2appendices_GG.pdf
*For stabilized soils, the following equations are used to characterize the material
*This equation is solved for M
_{r}
M
_{r}
fly ash = 17,500 psi
http://www.intrans.iastate.edu/reports/White%20et%20al.%202005_Stab_Vol21.pdf
*Effective Modulus of Subgrade Reaction, psi/in
k = M
_{r}
/19.4