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Ugwuanyi, H. K.
Department of Civil Engineering, Michael Okpara University of Agriculture Umudike
Nwaerema, V. C.
Department of Civil Engineering, Michael Okpara University of Agriculture Umudike
Okafor, F. O.
Department of Civil Engineering, University of Nigeria, Nsukka
ABSTRACT
The Annual Average Daily Traffic (AADT), being the ratio of the total volume of
vehicle traffic of a highway to the number of
days in a year, is a measure used primarily in transportation
planning and engineering.
Okigwe – Owerri road has been a commercially viable road linking the two cities
but has been under the threat of sub grade and pavement failures over the years
due to poor or improper design to checkmate the menace. An average daily
traffic load, which has been neglected by most design and construction firms,
affects the service life and strength of highways. In this research, the effect
of AADT, obtained by daily manual traffic count in two directions along the
highway in various strategized positions; in relation to the sub grade
compaction characteristics using British Standard (B.S 1377) specifications for
highway sub grade was investigated. It was discovered that the critical traffic
volume using twenty (20) year design period is 5,350,558 vehicles/year on
Okigwe – Owerri direction and 5,019,213 vehicles/year on Owerri – Okigwe
direction. The commutative axle load is 1,182kg. The average Optimum Moisture
Content (OMC) is 14.27%, while the average Maximum Dry Density (MDD) is
1.90mg/m3. This exposes a practical environment for a possible
enhancement of the sub grade compaction characteristics to achieve a higher
strength to sustain the heavy traffic volume.
Keywords: average daily traffic, traffic count, compaction, dry density, optimum moisture content
https://doi.org/10.33922/j.ujet_v6i1_2
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Published
Monday, June 01, 2020
Issue
Vol. 6 No. 1, June 2020
Article Section
GENERAL
The contents of the articles are the sole opinion of the author(s) and not of UJET.
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