AN ECONOMIC CONSIDERATION OF PAVEMENT OVERLAY DESIGN STRATEGIES: A CASE STUDY OF BAUCHI – JOS ROAD
AN ECONOMIC CONSIDERATION OF PAVEMENT OVERLAY DESIGN STRATEGIES: A CASE STUDY OF BAUCHI – JOS ROAD
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Date
2006-12
Authors
YARO, TIJJANI AHMAD
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Abstract
Pavement deterioration is revealed through many indications, among
which is roughness of its surface which is a collective consequence of the
various deterioration factors of the pavement. The economic impact of road
deterioration is considerable, and usually outweighs the consideration of riding
comfort, and thus providing the strongest objective for evaluating roads
improvement policies and corresponding cost implications. This work attempts to
address the effect of applying different strategies of overlay as remedies to arrest
the escalation of costs incurred by both road agencies and users, and finally,
determines the economic optimum strategy that minimize the total system cost.
In order to effectively achieve this, six different strategies (the do nothing,
200mm,150mm 100mm,75mm, and 50mm) were investigated to reflect both
service performance and economic evaluation. Relevant data for evaluating
performance were collected from the pavement evaluation unit (PEU) of the
Federal Ministry of Works, Kaduna and data concerning unit costs of road works
were determined from the World Bank’s “ROCKS” (Road cost knowledge
system). The Highway Design and Maintenance Model (HDM III) was used in the
analysis of the strategies. The model predicts the pavement deterioration and
maintenance effects, and calculates annual costs of road construction, vehicle
and operation, needed to perform the economic evaluation of the alteration.
Results obtained show that, for all the strategies considered, road user
cost exceeded all other costs and the strategy with the thickest overlay (i.e.
200mm) has the lowest road user cost of N33.4b. Also, the rate of deterioration
was lowest for the 200mm strategy, and is also associated with the highest user
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benefit N10.4b. On the other hand, the 75mm thick overlay strategy had the
lowest Total Systems Cost (TSC) of N35.5b and the highest net present value
(NPV) of N7.3b. The 75mm design strategy is therefore selected as the optimum
strategy
Description
A THESIS SUBMITTED TO THE POSTGRADUATE SCHOOL,
AHMADU BELLO UNIVERSITY, ZARIA IN PARTIAL FULFILLMENT
OF THE REQUIREMENTS FOR THE AWARD OF THE DEGREE
OF MASTER OF SCIENCE IN CIVIL ENGINEERING
(HIGHWAY AND TRANSPORTATION)
DEPARTMENT OF CIVIL ENGINEERING
AHMADU BELLO UNIVERSITY, ZARIA
DECEMBER, 2006
Keywords
ECONOMIC,, CONSIDERATION,, PAVEMENT,, OVERLAY,, DESIGN,, STRATEGIES,, CASE STUDY,, BAUCHI – JOS ROAD