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SMiRT consists of 8 tasks:
Tasks A and B: Development, construction and validation of SMT equipment Current SMT equipment allows either dry or wet binder delivery and are two very different systems. For one set of equipment to be able to deliver both, significant changes need to be made to existing equipment or a completely new system will need to be designed. A quality assurance system, which will measure and monitor variables such as dry binder delivery pressure, injection quantity and rate, column depth, and mixing energy, will also be designed and implemented in the new SMT equipment.
Task C: Laboratory treatability studies Extensive laboratory treatability studies will be carried out to optimise the selection and application of the additives for the field trials using both performance and cost. Site soils as well as generic soil and contaminant types will be tested. The treatments considered are stabilisation/ solidification, permeable reactive barriers and ground improvement. A range of conventional and novel materials and binders will be applied, some in dry and some slurry form. as appropriate for the required application including: organoclays, zeolites, zeolite-clay mixes, PC and blended PC, PC-zeolite and PC-organoclays and reactive magnesia cements. A range of tests will be conducted as appropriate for the required application including density, compaction, CBR, MCV, strength, leachability (batch and tank), flow-through column sorption and desorption, stress-strain, compressibility, wet-dry and freeze-thaw durability and resistance to chemical attack.
Task D: Field trials Extensive field trials will be carried out on at the selected site which will contain varied ground conditions and a cocktail of contaminants. The field trials will take a total of ~6 weeks in which a large number of soil mixed sections including reactive wall sections, hot-spot stabilisation/solidification treatments and ground improvement. The field trials are scheduled for the first half of 2011.
Task E: Field sampling, monitoring and testing Boreholes for groundwater monitoring will be installed upstream and downstream of the permeable reactive barrier wall sections. Sampling of the hot-spot stabilisation/solidification treatment and the ground improvement sections including all the different variable considered will be carried out and tested in the laboratory. Trial pits will be excavated for visual inspection of the wall sections and sample will be taken for testing. In-situ testing, such as CPT, will be performed as appropriate.
Task F: Laboratory testing of field samples The site trial samples will be laboratory tested for the same range of tests used in the treatability study work. Trends between different binder mixes including wet and dry binders, different installation techniques, variations with depth and between single and overlapping sections, where appropriate, and variations between the laboratory treatability study results and the field trial results will be investigated. As one of the main concerns is the long-term effectiveness of SMT treatments, a dedicated testing programme will be performed including desorption tests to assess the permanence and robustness of sorptive behaviour under varied environmental conditions, long-term monitoring of the groundwater around the treated areas on the site and the application of accelerated ageing experimental techniques and associated numerical modelling.
Task G: Stakeholder meetings A number of brainstorming and information exchange workshops and meetings will be held at which issues of stakeholder concerns will be addressed and will be fed back into the project activities.
Task H: Dissemination of the results Dissemination of the various research and development findings of the project to the wider community in the contaminated land, waste management and construction sectors, will be carried out using a number of routes throughout the project with significant contribution from CL:AIRE and Environmental-KTN.
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