Modification of Quaternary Clays Using Recycled Fines from Construction and Demolition Waste

Foundation of buildings in soft soil such as quaternary clay is often associated with difficult compaction, settlement, non-uniform and/or excessive deformation, and unsatisfactory shear resistance. The present study aims to assess the possibility using recycled fines from construction demolition waste, mechanically treated gypsum waste concrete powder (WCP), instead ordinary binders or industrial stabilization clay. A detailed characterization components presented. Seven mixes various proportions WCP are prepared. Main geotechnical parameters modified studied by applying standardized methods a few deviations. XRD analysis pH measurements performed. It was found that effect 5% 20% di-hydrate limited improvement moist compatibility. content 10% positively impacts cohesion oedometer modulus. an active component, containing non-hydrated cement, portlandite, calcite calcium silicates hydrate. As result, adding only, significant can be achieved: greater cohesion, reduced deformability higher UCS. When also added, further improved because ettringite formation.