Abstract
About 1 million tons of sugar-factory-ash generated every year in India. And its usage in geotechnical applications as a stabilizing agent and filling material is gaining momentum. However, a proper assessment of mechanical behavior of sugar-factory-ash as a backfill material and environmental impact of leachates generated during its usage are significantly lacking. In this study, triaxial shear behavior of sugar-factory-ash is investigated. Similarly, leachability tests are carried out to study the environmental impact. Furthermore, a gabion retaining wall was designed with sugar-factory-ash backfill to assess its economic feasibility. Triaxial test results showed that the shear strength (φ′m(p) ≥ 34°) of sugar-factory-ash is comparable with conventional backfill material. The alkaline nature of leachate results in a lower leaching rate (≤2.46) and lower concentration of toxic heavy metals, making it an inert waste (DEFRA, 2010). Its lower monetary value makes the retaining wall up to 41% more economical than conventional material. At the same time, its utilization can save equal amounts of natural resources from being exploited. This study revealed that technically sugar-factory-ash has a high potential as a backfill material and is economically more viable than conventional backfill material.
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