Development Of Integrated Project Delivery And Last Planner System Concepts As A Waste Minimization Technique In Ethiopian Road Construction Projects

Abstract

Every nation's socioeconomic progress is significantly influenced by the construction industry. But the construction industry also significantly depletes resources through waste generation. There is a proof that these wastes lower productivity in the construction industry. Additionally, construction wastes are one of the major reasons for cost overrun and delay. The aim of the study is to develop the concepts of Integrated Project Delivery and Last Planar System as a Waste Minimization technique in Ethiopian Road Construction Projects. This research contains both quantitative and qualitative, with a descriptive nature based on comparison judgment (prioritization) aiming to build an analytical hierarchical model for the implementation of Last Planner System and Integrated Project Delivery System. The study defines road construction projects which are currently on progress under the authority of Ethiopian Road Administration as a total population. In this study both primary and secondary data are used. The study mainly uses Analytic Hierarchical Process to prioritize the sources of construction waste and also it uses site observation to get better understand about waste generating activities in road construction projects. Based on the questionnaire data analysis; design change, poor workmanship, use of incorrect material (replacement), improper planning and lack of information on the drawing are the highest waste generating sources. From the result it is identified as operational wastes are the most waste generative sources followed by design wastes and material and handling wastes respectively. And also, activities which are considered as waste generating activities are identified from site observation. After that, explanation of the concepts of last planer system and integrated projects delivery system as waste minimization is discussed. On the discussion it is briefly explained that only the important concepts of these two lean construction tools towards waste minimization are taken for framework development. Next, based on the data analysis, site observation and literature review, conceptual framework is developed to support waste minimization. And finally, conclusion about the result obtained and recommendation on future research work is given