Discuss the process of lime stabilization, and indicate the soil characteristics for which it is most effective.
What will be an ideal response?
Lime stabilization can be used for stabilizing both base and subbase
materials. The materials most commonly used for lime stabilization are calcium
hydroxide and dolomite. Clayey materials are most suitable for lime stabilization,
but the materials should have plasticity index values less than 10 for the
stabilization to be most effective. The reaction of the material with the lime
reduces the tendency to swell as a result of an increase in moisture content; the PI
value of the soil is also reduced. Desirable changes also include a pozzolanic
reaction may also occur resulting in some cementation of the soil and in an
increase in strength; soils with high silica or alumina content may exhibit
significant increases in strength over long periods of time; and, finally,
flocculation occurs, increasing the effective grain size of the soil.
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