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Origins and magnitude of waste in the Turkish construction industry

Baytan, Mehmet
The aim of this study was to determine the quantity of construction waste for several construction materials and to state the probable origins of this waste, depending on case studies in Turkey. There is a lack of documented quantitative data in Turkey on how much material waste the construction industry generates and what amount of such materials remain unused due to this waste. Although some amount of waste is accepted as unavoidable, the probable reasons for it are unclear. Therefore, the study focused on determining waste percentage values for certain materials based on several construction projects and assessing the reasons for this as stated by the professionals who were involved in the construction process of these projects. For practical reasons, it was confined to the material amounts in the bill of quantities, progress payment reports and invoices for four different construction materials; namely, ready-mixed concrete, rebar, brick and floor block, which belonged to eight different projects of two construction companies. Data compiled on these aspects were analyzed statistically via ANOVA and regression analyses. The results showed that waste percentage values displayed differences among materials. Design-related aspects, skill level and attitude of labor, incorrect calculation of material quantities, contractual clauses and material defects were the most effective reasons for waste within the projects analyzed.