Truck overloading may cause excessive damage to the road infrastructure and will incur a significant increase in annual expenditure on roads for a road controlling authority and requires budgeting for. However, truck drivers violate the load regulation by neglecting the damage occurs on road. Thus, this study aims to reveal the existing truck overload situation and study the negative impact on pavement service life. The impact of overloading with respect to tire type and contact pressure will be dealt in depth. Axle load survey, secondary material property, and data for damage quantifiers are collected from the site visit and the concerned office. Some material quality investigations, like sub grade extension is carried out in laboratory data is used for the analysis was also collected. The research uses KENPAV software to calculate pavement critical responses such as stress, strain and deflection based on layer material properties and climatic conditions. The research tries to device mechanism to minimize the overloading situation in the country. Since the route is the only route heading to the port Djibouti, It entertains an intense traffic flow to and from the port. Truck overloading is the problem found in the entire country; however, the situation is severe on Awash – Mille road. To this fact, the location is preferred to be a primary choice for this study. Due to this reason and resource limitation (time and budget) the study is restricted on this specific site. However, End outcomes obtained from this study will help as a representative to indicate the seriousness of truck overloading on pavement service life in our country. On the road under study (Awash-Mille), heavy truck and articulated trucks are dominant types, of which its second tandem axle dual wheel arrangement is critical combination since it takes about 20.6% of gross vehicle weight. The research finds up to 1.86% of front axles are over the legal limit. Nevertheless, on average 29% of rear axles are still over the legal limit. As a result of this externally applied load. The induced pavement deflection, vertical stress and horizontal stress have minimum value in low temperature season than at high temperature season. Pavement life or number of load repetitions to failure obtained from either fatigue or rutting models. While, in our case it was governed by rutting failure. The research ultimately concludes that, increase in axle load limit, decreases pavement service life. Hence, when the axle load increase from 10 Tons to 12 Tones the pavement service life decreases to about 64% of the value for a pavement of having lower AC modulus xi (during high temperature season). While, pavement service life decreases to about 80% for a pavement having strongest AC modulus (during low temperature season). Due to the Ethiopian government‟s effort to minimize over loading problem, a lot of punitive measures has been set out. But, there were vehicles who frequently contravene the load regulation. Accordingly, because of those vehicles which increased axle load from 10 Tons to 12 Tones, the pavement would approximately have a chance to provide (remaining life) two third of its service life compared to 10 tones axle load during high temperature season. However, it loses only one fifth of its service life during low temperature season. The strength of asphalt stiffness has significant effect on the load carrying capacity of the pavement. The more the asphalt stiffness increases, the more it becomes durable (Long serving) and vice versa. To avoid the detrimental effect of axle load increase beyond the permissible limit, different mitigation measures has shown at the end of this document. In view of this, as a developing country with a limited resources, a durable / long serving/ road is necessitated to minimize the associated early maintenance cost. We demand a road in good condition and better transportation system. Having a road free of damage is economically worthwhile and establishes a comfortable and safe transportation system.
IMPACT OF TRUCK OVERLOADING ON PAVEMENT SERVICE LIFE
2017-01-01
doi:10.20372/nadre:1547982911.72
Theses
Electronic Resource
English
DDC: | 621 |
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