Abstract:
Now a day’s building construction industries are boosting globally and consuming
huge amounts of resources. However, responsibly managing waste on a building
construction project is a vital component of optimum use of the limited resources to
sustain the ongoing development in the construction sectors. Waste on site is the
difference between that used as specified and the quantity of material delivered to site
as a percentage of such deliveries.
The Ethiopian construction activities were exponentially grown but the construction
management practice are poor. The Construction industry in jimma, is an activities
and crucial segment in economic development of the town. It generates tons of
construction wastes per year, making construction wastes a cross cutting issue for indepth investigation. Until now, there is no study in Jimma construction sites that has
investigated this issue and addressed the main causes and factors that contribute to
construction wastes.
Therefore, the general objective of this study was to investigate on the factors
affecting construction materials wastage on building projects. This study also
identifies the main causes, determine the percentage of construction materials, rank
and analyses the main effect on the group of factors and to measure the minimization
practices of construction materials wastage on building projects.
The data analyzed was calculated using relative importance index (RII) and the
numerical formula to determine material quantity data as well as the percentage of
construction materials wastage on building projects considering building schedules of
rates (BSR) as the basis for analysing the level of percentage.
The research discovered that the major factors that causing construction waste in
building projects are material storage and handling, design and documentation,
procurement, operational respectively In addition, the key materials which quantified
as per the percentage level wastage coarse aggregate (12.26%), fine aggregate
(11.73%), HCB (11.65%), reinforcement steel (9.23%), concrete mix (7.52%), and
cement (6.11%) are the key materials wasted on construction sites.
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.
