The effectiveness of nominal dosage of ordinary cement on strength and permeability of clayey soil
2008
Hossain, Md.Z.(Mie Univ., Tsu (Japan)) | Sakai, T.
Pozzolanic materials, either naturally occurring or artificially made, have long been in practice for soil stabilization. Of the artificial pozzolans, the ordinary portland cement is the most commonly used globally. Literature review indicates that, to date, the percentage of the cement used to improve the properties of soil is 4 to 14% or more. For the sake of cost saving in soil-cement construction works, it is crucial to scrutinize the efficacy of an incredibly diminutive amount of cement on the engineering properties of soils. In this paper, efforts have been made to study the usefulness of nominal dosage rate of the ordinary portland cement on the bearing capacity and permeability of a clayey soil in Mie prefecture. Laboratory tests were conducted on California Bearing Ratio (CBR), unconfined compressive strength and the permeability coefficient of the clayey soil with the cement content of 0.0, 0.2, 0.4 and 0.6% in the ratio of mass. On the basis of the test results, it was concluded that both the CBR and compressive strength, a measure of bearing capacity of a soil, increased with the increase in the amount of cement. The stress-strain relationships of the soil under the unconfined compression tests indicated that the addition of the nominal dosage rate of ordinary portland cement reduced the strain at which the ultimate compressive strength occurred noticing the increase in the rigidity of soil. The modulus of deformation, a measure of deformation characteristics of a soil, was also found to increase with the increase in the quantity of cement content. Permeability tests revealed that the coefficient of permeability increased with the increase in the amount of cement.
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