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The R-Value, or resistance value, of a soil is measured in a stabilometer test, and is usually estimated for pavement design. The R-value is the ability of a soil medium to resist lateral spreading due to an applied vertical load, such as tire loads. A range of values are established from 0 to 100, where 0 is the resistance of water and 100 is the resistance of steel. Typical R-values are presented below (from Lindeburg):

Clay:                            5-15
Sandy Clay:               10-20
Clayey Silts:              20-35
Sandy Silts:                20-55
Silty Sands:                25-70
Sand:                          40-75
Gravel:                       20-80
Good Crushed Rock: 75-90

Other soil and soil related properties are listed below:

Angle of Internal Friction
Bearing Capacity Factors
Cohesion
External Friction Angle
Factor of Safety
Lateral Earth Pressure Coefficients
Modulus of Vertical Subgrade Reaction
Soil Unit Weights
Young's Modulus or modulus of elasticity

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