Assessment Of Damages Caused By Expansive Soil On Roads Constructed In Addis Ababa

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Roads are one of the basic infrastructures and serve as means of a communication system for any country.rnThe investment budgeted and the cost for original construction and repair of roads of our country isrnrelatively high. rn Most of the time road lines constructed in our country failed early before functioning the design life. Thisrnis because of various problems arising from different causes. Among these roads which are failing beforernserving its design life is the Addis Ababa Roads. The main reason is that large areas of these roads arernconstructed on problematic expansive soils. This is due to improper construction and operation of the road. rnIt is well known that Addis Ababa is a populated and investment area as it is the capital city of Ethiopia.rnAs a result, the roads in Addis Ababa serve or carry the highest daily traffic in the country. These roadsrnwere constructed and opened to traffic in different years accordingly. The design pavement life wasrnestimated at 15 and above years, however; pavement structure failures have been observed sincernconstruction time, within the first few years after opening to traffic. rnFrom the end of construction to date, the Addis Ababa roads are repeatedly under periodic maintenance.rnConsiderable resources were spent during this period on periodic maintenance, but without solving thernbasic problem. This maintenance is not working as each maintained section is failing within a short period,rnhence, it needs to investigate the root causes of the failure to come up with an appropriate solution. rnThis paper tries to present some issues of geotechnical cases for roads built on expansive soils. Some casernstudy sites, representatives knew problem-areas in Addis Ababa were carefully selected for geotechnicalrnsite investigation. The field exploration consisted of detailed observation and measurement of damagedrnroads. These road damages have been identified and characterized based on the theoretical aspect of soilrnproperty and its effect on construction. This work was also have been used any secondary data concerningrnthe study area as a baseline and it was helped as an input. rnField investigations which include visual condition survey, DCP test, Benkelman Deflection measurement,rnand other methods were conducted to investigate causes of failure. Finally, based on the investigation, all causes of road failure are identified. Based on the identified damagerntypes and their causes, maintenance and rehabilitation mechanism or techniques are recommended andrnsuggested.

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Assessment Of Damages Caused By Expansive Soil On Roads Constructed In Addis Ababa

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