Abstract. The objective of the present study is to depict an inclusive Construction Waste Management (CWM) plan looking at the total project life cycle. This holistic approach is called Integrated Construction Waste Management (ICWM). This research program has been conducted through several consecutive academic dissertations at Civil Engineering Department of SUT and was rstly aimed to identify waste sources throughout project life cycle. Concurrent research e orts were focused on project delivery methods evaluation, e.g. contract type e ect on waste generation amount along with appropriate guidelines/incentives development that could promote ICMW. These studies were conducted via eld observations and questionnaire surveys where respondents were educated, skilled, and experienced construction industry experts. The research ndings indicate that construction waste origins/processes should be determined separately during the life cycle of construction projects to devise exclusive solutions accordingly. Furthermore, cost-plus contract, which is common in local residential projects in Iran, is identi ed as an improper contract type from construction waste generation standpoint. Incentive based programs, project stakeholders training, salvage plan establishing for all materials before project initiation, and apt documentation for future CWM planning are identi ed as e ective/practical ICWM solutions. Finally, it is concluded that thriving ICWM is going to be a teamwork result rather than responsibility of a sole stakeholder, e.g. contractor.
Abstract:Purpose of this research is twofold. Study's first part focuses on developing quantitative wastage models for rebar, concrete, brick and cement, as major bulk traditional building materials, used in Tehran residential buildings. Primary results indicate that multiple linear regression is an apt tool to model studied variables' effects on materials wastage. In every developed wastage model, subtractive or accumulative effect of each studied variable is recognized by its coefficient value and sign. Developed models resulted in adjusted R 2 values of 0.907, 0.875, 0.920 and 0.790 respectively for rebar, cement, brick and concrete waste. Cement, with average wastage of 8.57% by weight, is identified as the most wasted material verified by the case study.In study's second part, previously developed models as well as project management experts' opinions were combined to structure a cement waste reduction guideline for traditional building construction which is common in Tehran, Iran. With this purpose in mind, for projects' initiating phase, choosing lump-sum contract instead of cost-plus contract is suggested. Moreover a financial incentive reward scheme, with its economic viability and environment friendliness, has been tested with positive results and hence is proposed for construction phase. Applicability of proposed scheme is verified through a case study.
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