Evaluation of geotechnical properties and liquefaction behavior of cohesive subgrade soil stabilized with fly ash, gypsum and lime

Abstract

This paper is an investigation to evaluate the stabilization of silty clay subgrade (A-6) brought from Ohio State-United States. Atterberg limits standard proctor compaction, unconfined compression, triaxial, consolidation and swelling tests, in addition to liquefaction tests were carried out on subgrade mixed with 5% fly ash, 5% gypsum, 10% fly ash, 10% gypsum and 10% fly ash mixed with 5% lime. It is concluded that the soil that stabilized with 10% fly ash and 5% lime improving the stiffness, compressibility and shear strength characteristics as well as it shows withstanding against liquefaction by reaching high value of normalized principal stress when reaching to critical built up of pore water pressure which lead to the fact that a liquefied condition could not possibly develop in the mixture. Many correlation equations obtained to evaluate the stiffness of stabilized soil. © Springer-Verlag Berlin Heidelberg 2013.