EVALUATION OF THE CONSTRUCTION RESOURCE WASTAGE MINIMIZATION MECHANISMS ON CONCRETE AND MAIN CONCRETE MAKING MATERIALS ON THE SITE: A CASE STUDY IN WOLAYTA SODO TOWN BUILDING PROJECTS

Abstract

A great deal of the time, the actual percentage of waste produced is substantially more than first anticipated, increasing the project's cost. Thus, reducing materials waste in building projects could result in significant cost savings and profit growth. This Project work was attempted to assess the current situation of mechanisms of minimizing wastage of concrete and concrete making materials. The general objective of this study was to assess construction resource wastage minimization mechanisms on concrete and major concrete making material in Wolaita Sodo town building project this study also identifies the main cause’s wastes and rank, identify the effects of the wastes and finally provided minimization practices of concrete and main concrete making material wastes. The main tools for the collection of data included questionnaires, interviews, site visits and document collected is used to identify the various efforts that have been made in the past to evaluate and examine the causes and sources of construction materials waste. The data analysed was calculated using the relative importance index (RII). The findings of this project study indicated that the level of contribution of the waste sources to the generation of waste saw differences between the perceptions of the respondents (Contractors and consultants). The results from analysis ranked from the 1st to 5th position by contractors and consultants that the most significant factors causing construction waste on building construction projects are Design and documentation, Operation, Site management and practices, material and Site supervisor factors. The survey focused on the four most dominant materials in terms of influencing the project costs which are concrete and major concrete making material such as cement, sand, aggregate. The variables were then ranked in their order of importance based on the response of the consultant’s and contractors. Therefore, the project study's findings show that good construction management, proper material handling and storage, encouraging the reuse of waste materials, and the use of suitable software to reduce design changes and over ordering are all necessary to minimize waste on building projects.