Demessie, Abeba Berhanu (2023). The Evaluation Using a Life Cycle Approach of Different Types of Road Pavement Surfacing Subjected to Climate Impact. University of Birmingham. Ph.D.
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Demessie2023PhD.pdf
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Abstract
The choice of road surfacing depends on different factors, as each type has its own use, and its suitability depends on different circumstances. The pavement surfacing in the road network plays a key role in achieving the design target in changing climate and traffic conditions. However, consideration of the potential impact of future climate change in the calculation of the life-cycle cost analysis is limited. To address this, the study aimed to compare the life-cycle costs of various bound surfaces under future climate change impacts. The objectives include developing a framework for the analysis; calibration of the HDM-4 deterioration model to local conditions; future climate change adjustments to the roughness model for the selected emission scenario; and an assessment of the climate change impact using discrete and continuous approaches on selected bound surfaces.
The methodology developed in the research was used to investigate the effect of climate change on five surfacing types used in Ethiopia for three traffic levels in five different climate zones of the country. The developed framework can be applied to evaluate not only the identified surface types, but also to other pavement surfacing alternatives for different scenarios. For the considered climate change periods from 2016 to 2059, the roughness model showed environmental age coeffect adjustment from 1% to 10% to incorporate the climate change effect.
The results revealed that from representative AC sections of high-traffic-volume roads, 100% in the moist and semi-arid and 75% in sub-moist climate zones were economically viable compared to DBST, JPCP, and JRCP. The maximum increment in the RUC for these emission scenarios was obtained for the DBST pavement. At the end of 15 years, the user was expected to be charged the highest additional cost (10,941.06 million ETB/km (₤269.68 million/km)) when using DBST roads with routine maintenance to correct the additional deterioration caused by the change in climate under the maximum A2 emission scenario. However, the user may be charged 10,865.66 million ETB/km (₤267.83 million /km) for AC, if compound maintenance is applied for the same deterioration caused by the climate change scenario. For the minimum A2 emission scenario, 0.024 million ETB/km and 0.029 million ETB/km (₤591.57/km and ₤714.82/km) maximum additional user costs were obtained for AC and DBST pavements, respectively.
Similarly, from the AC section, 100% for the arid and sub-humid high-traffic-volume roads and 62.5% for the sub-humid medium-traffic-volume roads were also economically feasible with a positive NPV/cost ratio under future climate change. In the moist climate zone for medium-traffic-volume roads, the finding showed that 66.67% of DBST and 100% of Otta-seal sections were resilient to future climate change. The DBST sections were strong enough to resist future climate change and they were more economically suitable than AC for low and medium traffic-volume roads in all climate zones, except in moist and sub-humid zones. In addition to this, the lesser deterioration and RUC for AC JPCP and JRCP were observed when continuous climate change analysis was done for the whole 44 years than the usual one-way approach.
It was concluded that the pavement surfacing selection criteria need to be supplemented with an LCCA since only 71% of the existing representative road pavement surfaces are resilient to future climate change and also economically viable.
| 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: | School of Engineering, Department of Civil Engineering | ||||||||||||||||||
| Funders: | Other | ||||||||||||||||||
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) | ||||||||||||||||||
| URI: | http://etheses.bham.ac.uk/id/eprint/13455 |
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