| Abstrakt: |
Freeze–thaw experiments were conducted on a frost susceptible soil stabilised using alccofine and incorporating a soluble salt in pore water. The objective behind the investigation was to study the effect of solute incorporation on the frost susceptibility of alccofine-stabilised soil. The optimum alccofine content by weight of dry soil corresponding to maximum unconfined compressive strength of the treated soil was first determined. Then, alccofine-treated samples with and without 5% CaCl2(salinity in pore water) were prepared for testing in a customised laboratory-based freeze–thaw test setup that allowed unidirectional freezing of the sample. The maximum frost heave, the heave rate, and the thaw-CBR were compared for different samples tested. In addition, the effects of salinity on depth of frost infiltration and moisture movement during freeze and thaw were also studied. By lowering the overall ice content during freezing, the existence of pore water salinity was found to alter the treated soil’s overall frost susceptibility by reducing frost heave, depth of frost infiltration, and moisture movement towards the freezing front and generating higher thaw-CBR compared to non-saline treated samples. Also, less soil degradation at the microstructural level was established by scanning electron micrographs. |
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