USE OF RECYCLED CONSTRUCTION AND DEMOLITION WASTE AS REINFORCED FILL OVER WEAK SUBGRADE

ABSTRACT: This research investigates the role of geogrid reinforcement in enhancing the performance of recycled construction anddemolition waste (CDW) when utilized as a foundation material over soft sandy soil. The study addresses the limitationsof using CDW due to concerns about its mechanical properties by exploring its reinforcement with geogrids. A series ofstatic plate load tests were performed on 200, 300 and 400 mm thick layers of both unreinforced and geogrid reinforcedCDW. The results demonstrated significant improvements in bearing capacity, with enhancements ranging from 31% to81%, and a notable reduction in settlement under applied loads due to the geogrid reinforcement. Additionally, thepresence of geogrids contributed to increased stiffness and shear strength of the CDW layer. The findings of this studyadvocate for the consideration of geogrid reinforced CDW as a sustainable and structurally reliable alternative to naturalaggregates in foundation applications over weak soil, promoting environmental sustainability in construction practices.