Endale, Alemayehu (2024). Development of asphalt pavement recycling method for road maintenance and construction in Ethiopia. University of Birmingham. Ph.D.
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Endale2024PhD_Redacted.pdf
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Abstract
Ethiopia is a landlocked country where the road network is of paramount importance as it carries over 90% of freight and people movement. Cognizant of this, the government launched a Road Sector Development Program (RSDP) in 1997 and spent over 525billion ETB (9.53 billion USD) for rehabilitation, upgrading and construction over 25 years. Seventy percent of the expenditure was on asphalt roads. Many of the roads constructed, upgraded or rehabilitated since the beginning of the RSDP are reaching the end of their design life and are creating a significant backlog in road maintenance works due to budget constraints and capacity limitations. Due to the lack of maintenance and increase in traffic, many roads need major rehabilitation. Conventional mill and overly may not be feasible considering the urgency of rehabilitating these roads and there is a need to reduce costs and conserve natural materials to improve sustainability and reduce environmental impact. It is considered that these benefits can be achieved by reusing old asphalt pavement. Accordingly, systematic review of the literature combined with suitability criteria was used to select the most appropriate recycling method. Using Analytical Hierarchy Process the criteria were evaluated and those related to cost effectiveness, Ease of application, environment, and energy conservation are more important in evaluating recycling methods. The result indicated that cold recycling methods are more favorable than hot recycling. It is also found out that as the Reclaimed Asphalt Pavement (RAP) amount used increases an average of 27%cost saving is obtained for RAP 20% to 90%used in HMA mix. The maximum amount of cost saving was 49% obtained for 90% RAP. Economic analysis indicated that saving on total transport cost does not vary for different climatic zones (Semi-arid, Sub-humid and Tropical-humid), however, they showed different pavement deterioration trends.
Key Words: Systematic review, Recycling, Asphalt, Pavement rehabilitation, RAP materials
| Type of Work: | Thesis (Doctorates > Ph.D.) | |||||||||
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| Award Type: | Doctorates > Ph.D. | |||||||||
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| Licence: | All rights reserved | |||||||||
| College/Faculty: | Colleges (2008 onwards) > College of Engineering & Physical Sciences | |||||||||
| School or Department: | Department of Civil Engineering | |||||||||
| Funders: | Other | |||||||||
| Other Funders: | Ethiopian Roads Adminstration, University of Birmingham | |||||||||
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) T Technology > TE Highway engineering. Roads and pavements |
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| URI: | http://etheses.bham.ac.uk/id/eprint/14594 |
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