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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/3109

Title: Time – Cost Relationships for Public Road Construction Projects in Ethiopia
Advisors: Dr. Ing. Wubishet Jekale Mengesha
Keywords: Construction Management
Time - Cost relationship
Bromilow’s Principle
Earned Value Management
Copyright: May-2008
Date Added: 21-May-2012
Abstract: This research work has tried to test the time – cost relationship of road projects by using the hypothesized empirical and graphical models developed for the concept. Based on the Empirical Bromilow’s Model, the duration of Ethiopian Federal Road Construction Projects has been modeled by a time - cost formula expressed in the form of T = KCB, where T is the actual construction time in calendar days, C is the final cost of contract in Ethiopia Birr, K is a constant characteristic of time performance, and B is a constant indicative of the sensitivity of time performance to cost level. This thesis applied the relationship to 33 projects based on the two categories International Contractor (IC) and Domestic Contractor (DC) Projects and on the adjusted and unadjusted cost basis. Analysis using both linear and multiple regression technique was performed between project duration (i.e., time), project cost, project length and type of construction (asphalt concrete, double surface treatment, and gravel surface). The analysis results indicated that the above principle is valid to IC projects and is invalid to DC projects based on T – test. Though the Bromilow’s principle has been found to invalid for DC projects, the relationship between contract Time and length has been developed. In addition the research has developed a cost prediction model for IC projects. Based on the Graphical Model, the time – cost relationship has been reviewed by using the cumulative time – cost curve(S – curve) concept and the earned value management techniques (EVM). The applicability of this curve was tested by using two case study projects. The test for smoothness of the curve was carried out by testing the reliability index using Weibull probability functions. In addition to that EVM techniques like Schedule Variance, Schedule Performance Index and Estimate to Completion were used to view their applicability. The analysis results clearly indicated that the S- curve concept is not applicable to the case study projects and the tools of EVM technique are better indicators of the performance than the S – curve.
URI: http://hdl.handle.net/123456789/3109
Appears in:Thesis - Civil Engineering

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