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REUSE OF WASTE MATERIALS AS SUSTAINABLE SOLUTION TO STABILIZE THE EXPANSIVE CLAY SOILS
Abstract
The expansive soils, known for significantly volume changes when subjected to moisture, pose major problems to foundations, causing severe damages to structures built on this kind of soils. Recent environmental approaches are focused on the conservation of natural resources and on reducing the effects of waste landfills by recycling and reusing different types of waste materials. In this perspective, a sustainable way to deal with expansive clay soils is to integrate them back into secondary building materials or to provide cost-efficient and ecological solutions for engineering purposes, such as the treatment of difficult soils. The paper studies the possibilities of improvement of the mechanical parameters of soils by reusing construction waste materials and additional water-based polymeric product. In this study, uniaxial compression strength (UCS) and compressibility parameters of three sets of mixtures with expansive soils stabilized with 5%, 7% and 10% of concrete and ceramic tiles have been investigated. Moreover, in order to quantify the strength behavior, the samples were cured for 7 and 28 days at normal temperature and humidity conditions. The results showed that the treated soil specimens were substantially improved in terms of strength and swelling pressure while increasing the percentage of waste materials in the mixture. Also, the outcomes of the experimental tests clearly demonstrate the optimum use of construction wastes in engineering applications as a sustainable alternative in ground improvement practice, apart from environmental benefits of minimizing waste generation.
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