A management approach to construction and demolition wastes in ibadan metropolis

Abstract

The construction and demolition waste impacts negatively on the natural economy and the environment. This paper examines some engineering and management approaches such as waste segregation, reduction concept, reuse concept, waste exchange concept and waste rethink concept to construction and demolition wastes in Ibadan Metropolis. Two sites each were visited for construction and demolition activities to observe and quantity their waste characteristics. Construction site A is of a 40.375m length by 39.225m width storey building at decking slap stage with a total waste components of 2500Kg having 32% of it as wood(planks) and 36% of it as bamboo. Construction site B has 42.1m length by 24.385m width storey building at lintel stage has total waste components of 625.5Kg with 48% of it being wood(planks) and 0.90% of it being cement bags(sacks). Demolition site C has a total of 10850Kg with 92.2% of it as concrete/brick wastes and 0.50% of it constitutes electrical and paper materials and demolition site D of total waste components of 8630Kg has 93% of it as concrete/brick materials and 2.3% as metal wastes. These figures show that an enormous amount of wastes are generated from construction and demolition activities and if not properly managed, it could negatively impact our environment. Therefore, it is ideal that appropriate measures are taken to ensure effective management of these waste hence the various waste components identified in all the sites under consideration can be harnessed and transformed into other uses.