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How S/S is conducted

CONCRETE ENGINEERING

S/S can be carried out either insitu or ex-situ depending on the site conditions. Insitu S/S is usually carried out as a shallow (0-0.5m), intermediate (0.5-5m) or deep (over 5m) treatment.

Shallow treatment involves spreading the cementitious binder over the surface of the ground to be treated, and then mixing it in using rotovatingtype plant.

Intermediate reatment uses a range of standard soil engineering plant.

Deep treatment uses modified augurs, through which the binder is introduced as slurry or powder and mixed into the contaminated soil.

With ex-situ S/S, the contaminated ground is excavated and mixed with the selected binder and a predetermined dosage in a pugmill mixer. The process can be carried out continuously or in batches.

Ex-situ S/S is especially good at addressing problems of heterogeneous ground with buried foundations, and situations where the treated materials are to be selected and used as an engineered fill. It is also suitable for pretreatment of waste for landfill.

Further reading:

Remediating Brownfield Land

The Concrete Centre in association with the British Cement Association and the British Lime Association.

The Essential Guide to Stabilisation/Solidification for the Remediation of Brownfield Land using Cement and Lime.

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