Cement and lime seem to be the most common soil stabilizers but they are expensive. Which other materials can be used to effectively modify or stabilize soils?
Tire derived aggregate (TDA) is made from shredded tires and is used for a wide range of engineering applications. These include slope stabilization, retaining wall backfill, lightweight embankment fill, and various landfill applications.
The best and environmentally friendly material is limestone/marble dust.
More recently, trend is towards the environment-friendly materials.
If we consider the consumption of energy in the ground improvement processes, the use of recycled materials is the best choice, and the biological methods as well
The stabilizing agent should also be selected taking in account environmental point of view as Mohsin Qureshi nicely indicated.
The leaching of the fly ash and bottom ash for instance should be tested prior to usage. In Sweden, thousands of tons of fly and bottom ash are being stabilized with cement and disposed as hazardous wastes while the "environmentally friendly" ash is deployed for many civil engineering applications like soil stabilization, light weight blocks, cement production etc.
In my laboratory we are testing fly ash soil stabilization and it can be good solution.
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