Abstract:
Most of the times, the actual percentage of waste generated is much higher than initially
assumed, causing the additional cost of the project. Therefore, minimizing materials
waste in the construction projects could yield great cost savings and profit increment.
This research was attempted to assess the current situation of minimizing wastage of
construction materials. The general objective of this study was to assess construction
resource wastage minimization mechanisms on concrete and major concrete making
material in Jimma town building project This study also identifies the main causes
wastes and rank, identify the effects of the wastes and finally provided minimization
practices of concrete and 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 analyzed was calculated using the relative importance index (RII).
The findings of this research 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 this study conclude that in order to minimize wastage on building projects
were practicing good construction management, proper storage and handling of
material, encourage re- using of waste materials and uses of appropriate software
package to minimize design changes and over ordering.
