Browsing by Author "Sagidullina, Nazerke"

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    ENGINEERING PROPERTIES OF CEMENT-TREATED SILTY SAND SUBJECTED TO FREEZE THAW CYCLES
    (Nazarbayev University School of Engineering and Digital Sciences, 2022) Sagidullina, Nazerke
    The problem of soft ground is currently of great interest, as with the rapid development of infrastructure, researchers are trying to cope with the improvement of properties of problematic soil to build structures on it since any structures built on weak soils can be easily damaged. In cold regions, the problem of weak soils is further exacerbated by freeze-thaw cycling, resulting in reduced soil strength. For the improvement of soil properties, the soil stabilization method can be used. For such purposes, ordinary Portland Cement (OPC) is commonly used. However, despite the effectiveness of OPC cement as a binding material, it produces a significant amount of carbon dioxide emission. As an alternative to OPC, calcium sulfoaluminate (CSA) cement can be used. Therefore, the purpose of this research study is to present the results from laboratory experiments to evaluate the effectiveness of the soil treatment method using CSA cement for the improvement of the properties of silty sand. The unconfined compressive strength (UCS) and ultrasonic pulse velocity (UPV) testing conducted on the soil samples that were cured for 3, 7, and 14 days and subjected to 0, 1, 3, 5, 7, 10, and 15 freeze-thaw cycles. The water content is defined from the optimum moisture content and three different cement content were used, 3%, 5%, and 7%. Applying the results from the unconfined compressive strength (UCS) test, the strength loss/gain and resilient modulus parameters were obtained. The findings of the study show that the strength and pulse velocity values decreased with the exposure of soil specimens to cyclic freezing and thawing. However, improvement in soil performance can be observed with the use of CSA cement. Overall, the application of CSA cement for treatment purposes could be an effective method to enhance soil performance and meet the subgrade design requirements.