Idoro, G.I.
Department of Building, Faculty of Environmental Sciences, University of Lagos, Akoka, Lagos

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Empirical Evaluation of Construction Material Waste Generated on Sites in Nigeria Adewuyi, T.O.; Idoro, G.I.; Ikpo, I.J.
Civil Engineering Dimension Vol. 16 No. 2 (2014): SEPTEMBER 2014
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (535.755 KB) | DOI: 10.9744/ced.16.2.96-103

Abstract

The study investigates the level of construction material waste generated on building sites in South-South, Nigeria. The objective is to empirically establish the level of waste generated on building sites and compare such with the allowable value in estimates. Data were collected from 30 on-going public building projects for six months. The level of material waste was calculated in percentages while one way ANOVA was employed to compare the waste values among the States in the zone. The significant difference between actual and allowable values of waste was tested using paired t-test. The level of material waste was found to be 11.69, 12.10, 10.45, 14.54, and 12.07 for concrete blocks, steel reinforcement, timber, and tiles respectively. It was concluded that these values are significantly different, with p-values < 0.05, from the allowable waste. The study recommends that the values of waste derived by this study be adopted in estimates
Contractors Perceptions of Effects of Project Overhead Costs on Building Project Performance in South-South of Nigeria Ujene, A.O.; Idoro, G.I.; Odesola, I.A.
Civil Engineering Dimension Vol. 15 No. 2 (2013): SEPTEMBER 2013
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (306.332 KB) | DOI: 10.9744/ced.15.2.102-113

Abstract

This study assesses 12 types of project overhead costs, 6 methods of allocation and 15 factors which affect project overhead costs in South-South of Nigeria. The objective is to compare small and medium contractors’ perception of the methods of allocation, factors affecting project overhead costs and the effect of the types of project overhead costs on cost, time and quality of the projects. Data were obtained through 501 structured questionnaires administered to small and medium contractors and analysed using mean item score, and Mann-Whitney U test. The results reveal that contractors perceive that supervision costs, cost of rework, equipment management costs, general field expenses, and temporary works costs were prominent overheads affecting cost, time, and quality performance of projects. There is no difference in the contractors’ perceptions of issues affecting overhead costs. It is recommended that contractors should give adequate priority to significant project overheads and their influencing factors.