Utilization of waste rubber tires in artificially cemented alluvial clay

Problematic soils possess unfavorable engineering properties that need to be treated before usage, whilst cement is one of the most common materials used for such purpose. However, cement production is one of the highest contributors to global CO2 emissions that cause global warming. On the other hand, a massive amount of waste rubber tires is being generated annually, which commonly are being disposed of in landfills causing many environmental and health problems. In this context, this study investigates the performance of waste rubber tire inclusion in alluvial clay stabilized with ordinary Portland cement. For this purpose, samples of various mixes were prepared, containing soil, cement content (7%, 10%, and 13%) of the dry mass of the soil, and two types of rubber tires (i.e., powder [TRP] and fiber [TRF]) proportioned as (0%, 2.5%, 5%, 10%, and 20%) of the cement quantity. The blends were compacted at (1600 and 1800 kg/m3) dry densities and 7, 28 and 60 days of curing. After curing, strength (unconfined compressive strength, and stiffness), durability (wet/dry cycles), and microstructural (SEM, XRD, XRF) evaluations were performed. Furthermore, life cycle assessment (LCA) of employing the tires in cemented soils was performed to highlight the environmental impacts of such technique. Overall, the results showed that the inclusion of 2.5% to 5% TRF or TRP replacing cement is the ideal range of rubber tire content in the composites studied concerning strength, stiffness, and weathering resistant performances. Furthermore, LCA results confirmed the significant contribution of this method to the environment.


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Citation Formats
L. N. A. AL-SUBARI, “Utilization of waste rubber tires in artificially cemented alluvial clay,” M.S. - Master of Science, Middle East Technical University, 2022.