Chemical stabilization of residual granitic soils
DOI:
https://doi.org/10.14195/2184-8394_101_2Abstract
This paper describes the results of a research work carried out for evaluating the beneficial effects when lime is used in stabilization of soils in which the predominant clay mineral is caulinite (like residual granite soils), benefits that relate to the change of classification and the improvement of load bearing capacity. The modifications in particle size distribution and plasticity of two soils, with different clay fractions, were studied when 2% calcitic hydrated lime was added. Furthermore, the beneficial effects on compressive strength were monitored when 6 and 10% lime was added, for curing times up to 10 weeks after mixing. The effects of saturation on stabilized soils were also studied. Moreover, the effects of a small percentage of NaCl added with 6% lime were studied. This addition proved to be a better alternative to the addition of larger amounts of lime, since the compressive strengths obtained were similar to those obtained with 10% lime addition. The results obtained indicate that the properties of this type of soil can also be improved by chemical additives, with advantages when used in pavement base and sub-base or in embankment construction.
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