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Unconˆned compression tests and suction measurements were carried out in the present work on sandy specimens with distinct Class F ‰y ash amounts, lime contents, porosities and curing periods to assess key parameters controlling strength of ‰y ash-lime amended soil. A special eŠort has been allocated in order to develop a dosage methodology for ‰y ash-lime improved soils based in a rational criterion, as it exists in the concrete technology where the water/cement ratio plays a fundamental role in the assessment of the target strength. The results show that the unconˆned compressive strength (UCS) increased linearly with the amount of lime for soil-‰y ash-lime mixtures at all curing time periods studied. A power functionˆts better the relation UCS-porosity for soil-‰y ash-lime mixtures. The bigger the amount of ‰y ash and the curing time, the larger the UCS for any given porosity and lime content. Finally, the porosity/volumetric lime content ratio, in which volumetric lime content is adjusted by a coe‹cient (in this case a unique value-0.12-was found for all soil-‰y ash-lime mixtures and all curing periods studied) to end in single correlations for each curing period, show to be a good parameter in the evaluation of the unconˆned compressive strength of the soil studied (UCS varies non-linearly with the porosity/volumetric lime content ratio in the case of ‰y ash-lime addition).

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