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Investigation Into Ascertain The Causes Of Failure And Present Traffic Capacity Of Highways
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CHAPTER ONE
INTRODUCTION
In construction of highway, generally the roads are not
designed to last forever. It is been designed to serve some purpose for a
specific time. As it can be seen in engineering work, the life span of a
road is always an important factor that must be taken into
consideration as one of the criteria for the construction. This really
depends on the factors like construction procedure and consideration,
the soil water relationship, quality of workmanship during the
construction and the type of maintenance culture adopted.
Many roads
(Highway mostly) are seen widely as attaining the state of failure and
show signs of distress before the expected life span used for
construction is reach, due to the lack of factors such as lack of
maintenance culture etc. many of our road today serve as death trap and
hang out for hoodlums going by the number of accident recorded daily on
them as a result of bad paved road.
Pavement failure can be defined
as the failure of the constructed layer of durable material of specified
thickness, usually of concrete, asphalt or bituminous materials
assigned to carry wheeled vehicles. Due to the number of load passing
through a pavement structure, some deflection of the surface and
underlying layers occur. The deflection can be as a result of the excess
load, poor material usage, and poor road foundation resulting from the
nature of the soil or groundwater rise in the area of high groundwater
level. If layers are lacking in strength, repeated applications causes
roughening and cracking that ultimately lead to failure of the pavement
structure.
The construction of the Eliozu-New Airport road, which was
constructed a while ago, sudden failure due to improper investigation
of either the soil composition or traffic capacity situation in the said
section of the road networking, lack of proper drainage to control the
effect of rise in groundwater level. The pavement thickness of the road
section as measure was about 3.87inches (98.3mm) and the width of the
dual carriage way about 7.9m with no proper shoulder and drainage
provided.
The effort of put in controlling the rate of failure and
provision for annually increase of traffic capacity has been a thing of
burden to the government of the River State in particular and the
Federal government in general. By questioning and observation, failure
of the said Eliozu-New Airport road as it problem from compounded
presence of water coming out at a particular points on the road surface
poor material and workmanship and pressure from increasing traffic
capacities on the road pavement of which the government is making
provision for overhead bridge which is currently in construction and it
is found out that most at a point like Eliozu junction by ABC shuttle,
the pavement bituminous material on the road have disappear.
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ABSRACT - [ Total Page(s): 1 ]The essence of this project work is to look into the causes of highway failure and the different types of failure which are presented along the Eliozu - New Airport road in Obio/Akpor L.G.A in River state, taken as a case study. Some factors identify as being responsible for the failure of the chosen road section includes, poor sub grade soil with questionable material. Ground water study is carried out, which give insight to it effect to the failure of the flexible pavement, lack of drainage fa ... Continue reading---
