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    Effect of a Class C Fly Ash on the Geotechnical Properties of an Expansive Soil
    (Kırıkkale Üniversitesi, 2009) Mollamahmutoğlu, Murat; Yılmaz, Yüksel; Güngör, Ahmet Gürkan
    In this study, an experimental investigation is carried out on the stabilization of an expansive soil with fly ash. In the course of experimental studies, the chemical, physical and mineralogical properties of the swelling clay to be stabilized and the fly ash are investigated. Swell pressure and swell tests are conducted on the samples compacted at optimum moisture content by standard Proctor test. The strength variation, swelling behavior of the mixture with curing period, the effects of the properties of the fly ash and the mineralogical content of the clay on the expansion behavior are examined. It is determined that 35 % fly ash treated expansive soil samples provide satisfactory fill material. Furthermore, the strength increases with curing timebut liquid limit, plasticity index, swell pressure and thus swell  percentage decrease substantially with the increase in fly ash percentage.
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    Stabilization of clays using liquid enzymes
    (Crc Press-Taylor & Francis Group, 2009) Yılmaz, Yüksel; Güngör, Ahmet Gürkan; Avşar, Cahit
    The potential of three different liquid enzymes to stabilize CL and CH type of soils is evaluated. The evaluation involved the determination of the geotechnical properties of clay soils in their natural state as well as when mixed with three different liquid enzymes, separately. The parameters tested included the particle size distribution, Atterberg limits, compaction characteristics (optimum moisture content and maximum dry unit weight) under standard Proctor compaction energy effort, swell percentage and California bearing ratio (CBR). All tests of the treated samples were repeated after 1-day, 7-day and 28-day curing periods. Results showed that the geotechnical parameters of clay soils are improved very little by the addition of liquid enzymes; plasticity and optimum moisture content were reduced around 5% to 10%, maximum dry unit weight is reduced as negligible as 1%. But, swell percentages and CBR values are increased by 5% to 350% and 5% to 70% depending on the curing period and type of soil treated, respectively. These results imply that although liquid enzymes provide some beneficial effects in CBR values, it is unlikely to be a substitute for CH type of soil as swell percentage increased dramatically.