Cement stabilisation is a remedial treatment technology used for contaminated soils. Portland cement is often used, in conjunction with lime, fly ash as a binding agent because of its ability to change the physical properties (solidify) as well as the chemical properties (stabilise) a range of contaminants. Solidification results in the encapsulation of contaminants, an increase in compressive strength and a decrease in the permeability of contaminated soils.
It is important that the correct mixture of binding agents is used to attain optimal results. Cement stabilisation allows contaminated soils to be disposed off site under a lesser classification to landfill or to be reused on site. Both of which have positive budgetary impacts.
A great advantage of cement stabilisation is its ability to treat various chemicals in one process. Cement is suitable to be used in the solidification and stabilisation of contaminated soil because of the way it reacts with other materials by either binding them, and in doing so locking up free liquids and organic contaminants, or by encapsulating and chemically transforming inorganic contaminants.
Testing of the treated waste is required prior to validation of the site is approved. Tests can include, dependent upon the specifics of the Immobilisation Approval (EPA requirement) under which the works are conducted, unconfined compressive strength and Toxicity Characteristic Leaching Procedure (TCLP). These tests are used to evaluate the physical and chemical performance of the treatment.
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