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Strength and stiffness of stabilized alluvial silt under freezing

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Document pages: 13 pages

Abstract: The Yellow River alluvial silt is stabilized as pavement base material in cold areas. The stabilizing additives are cement, fly ash and lime, which are included in a series of combinations and doses when mixed with sludge. The treated samples were subjected to freeze-thaw cycle to evaluate the performance of the material under frost. The test was carried out on samples cured for 7 to 180 days. The test results show that the samples treated with cement fly ash are better than the other two stability types in material strength and stiffness under normal and frost conditions. Under normal conditions, the unconfined compressive strength (UC) of the material increases to 3.0   the pressure on the 28th day is MPa according to the dosage of cement and fly ash used.If subjected to frost actions, the fly ash inclusions warrant a residual UC strength value of 1.3 MPa and above. The antifrost performance of the cement-fly ash-treated samples is related to thermal buffer capacity of the fly ash particles. Water adsorption and material soundness results agree with the strength and stiffness development. An optimal dosage was 3–6 for the cement and 0.3 for cement to fly ash mass ratio.

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