In this study, the influence of two types of fibre reinforcement, namely polypropylene and carpet waste fibres, on mechanical properties of cement treated kaolinite is investigated. The results of unconfined compressive strength testing of 63 cylindrical samples of cement treated kaolinite with varied cement and fibre contents are analysed to discern the relationships between these parameters and the key mechanical properties, including unconfined compressive strength and stiffness of treated soil. The fibre reinforcement increases the peak strength. The initial Young's modulus of the fibre reinforced cement treated kaolinite increases by adding polypropylene whereas slightly decreases when adding carpet fibres. The improvement of mechanical properties was far more pronounced with the introduction of polypropylene than carpet waste fibres. The implication of these findings is a cost effective and environmentally friendly alternative compare to increasing cement content in soil to achieve the required mechanical properties, particularly where the strength is a governing consideration.
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