Can lime be combined with fly ash for soil stabilization?
The addition of fly ash can significantly increase the compressive strength of a lime stabilized soil. The fly ash provides additional alumina and silica to the mixture made soluble at high pH, reacting with the calcium from the lime to form calcium aluminates and calcium silicates for the pozzolanic cementitious action. This is particularly beneficial for lower plasticity soils with higher silt content. With proper material selection and proportioning, virtually any granular soil can be stabilized with lime-fly ash.
