ECONOMIC EVALUATION OF PAVEMENT OVERLAY DESIGN STRATEGIES (KADUNA-ABUJA ROAD AS A CASE STUDY)
ECONOMIC EVALUATION OF PAVEMENT OVERLAY DESIGN STRATEGIES (KADUNA-ABUJA ROAD AS A CASE STUDY)
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Date
1989-08
Authors
ADEGBESAN, JOSEPH FOLORUNSO
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Abstract
ABSTRACT
There are two main phases to this work. The
first dealt with the overlay thickness design
while the second considered economic appraisal of
overlay design strategies.
Pavement overlay design on Kaduna - Abuja
road was carried out based on elastic layer and
traffic estimate theories, as well as field and
-Laboratory observations. The road was statistically
divided into 8 homogenous sections.
A computer program 'LAYER 5' was developed and
used for the calculation of horizontal and vertical
strain, vertical stress and fatigue remaining life
of the pavement based on Odemark, Burminster and
Boussinesq equations.
The economic appraisal of the design was based
on a cost model that considers all costs incurred
over a period of 20 years. A total of 10 strategies
involving design periods ranging from 2 years to
20 years at an incremental rate of 2 years were
considered for the different thicknesses of the
overlays. Relationships were developed for both
the maintenance and users costs as functions of
overlay thickness and design period. All cost
items were subjected to sensitivity analyses.
(vi)
The results of the economic appraisals showed
that those strategies that require frequent
overlays are more expensive than these with fewer
overlays. However, differences in total costs
diminish as from the design period of 14 years
onwards. Also, it was found that on the basis
of present physical conditions of the road, the
stretch spanning 2,3km - 8.0 km from Kaduna is
the strongest.
(vii
Description
A THESIS SUBMITTED TO THE POSTGRADUATE SCHOOL,
AHMADU BELLO UNIVERSITY, ZARIA, NIGERIA
IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE
DEGREE OF MASTER OF SCIENCE
IN CIVIL ENGINEERING
DEPARTMENT OF CIVIL ENGINEERING
FACULTY OF ENGINEERING
AHMADU BELLO UNIVERSITY
ZARIA, NIGERIA
AUGUST, 1989
Keywords
ECONOMIC EVALUATION, PAVEMENT, OVERLAY, DESIGN, STRATEGIES, (KADUNA-ABUJA ROAD