Recycled Aggregate Mixtures for Backfilling Sewer Trenches in Nontrafficable Areas

Sewer infrastructures that are backfilled with available onsite expansive soils may be exposed to damages due seasonal ground movements. Therefore, for deep excavated trenches located in nontrafficable areas, the suitability of utilizing mixtures recycled materials as alternative backfilling lower sensitivity moisture variations was studied. Extensive environmental and geotechnical testing programs were carried out on performance four proposed blends comprising different proportions glass, plastic, tire aggregates order determine an optimum mix design. First, potential hazards individual assessed. The investigation advanced by development application-specific program geomechanics theories methods associated granular materials. included determination maximum dry density achieved using a sand-rain technique (SRT) simulate real-life procedure trenches, compressibility modified oedometer test. In addition, migration finer particles within material possible long-term settlement area test results showed could safely used fill SRT revealed increased content height drop mixture decreased. At contents ? 15%, densities obtained through standard Proctor compaction close, achieving relative greater than 80%. Furthermore, simulating precipitation, inconsiderable segregation observed blends. Based developed experimental program, two recommended mixtures.