Technical Viability and Life Cycle Assessment to Excavated Soil and CDW Blends for Hydraulic Applications

摘要

The largest proportion of solid waste comes from the construction industry. Construction and demolition waste (CDW) include among others, petrous waste like those derived from concretes and masonry, ceramic rips, and excavation products, being the latter, the ones with the largest generation percentage. Petrous waste reuse is well studied in literature, however, the reincorporation of excavated soils with poorly geotechnical features represents a major challenge than traditional type of reuse. In this paper, experimental results are shown for the design of compacted blends composed of excavated soils, CDW and cement, which are selected as the main supply of prefabricated hydraulic elements. Technical feasibility was established from Proctor test and unconfined compressive strength results, both as a criterion for workability and maximum densification and use of waste. A life cycle assessment (LCA) was performed for the compacted blends with the best technical feasibility results to evaluate its environmental impact. The results showed that compacted blends with at least 90 of waste meet the technical criteria for being reused.