Abstract
Magnesite Mine Tailings (MMT) collected from Salem magnesite dump site are evaluated for their application as subgrade in road construction. Ordinary Portland Cement (OPC) was added to MMT by 2%, 4%, 6%, 8% and 10% of its dry weight and compaction characteristics, Unconfined Compressive Strength (UCS), Ultrasonic Pulse Velocity (UPV), California Bearing Ratio (CBR), durability characteristics and leaching characteristics were studied. In addition, X-ray Diffraction (XRD), Field Emission Scanning Electron Microscope (FESEM) and Energy-Dispersive X-ray spectroscopy (EDX) analyses were carried out to explore the stabilisation mechanisms. The addition of OPC aided in producing a denser mix. The strength characteristics have revealed that the addition of OPC increases the strength of OPC-MMT mixes. The relationship between UPV and UCS is established to help in non-destructive evaluation. Nonetheless, higher cement content is mandatory to withstand the durability cycles. The stabilized mixes have fulfilled the environmental regulatory limits. The XRD, FESEM and EDX analyses have shown the products of hydration and alkali-magnesite reactions. This study finds that the cement treated MMT can be used as a subgrade in road construction which will not only reduce the negative environmental effects of open dumping of MMT but also replaces the natural soil in subgrade construction.
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