Design of Pavement Subdrainage for Iran

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Pouranian, Mohammad Reza | 2009

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 39564 (09)
University: Sharif University of Technology
Department: Civil Engineering
Advisor(s): Tabatabaei, Nader
Abstract:
It is widely recognized today that excess moisture in pavement layers, when combined with heavy truck traffic and moisture-susceptible materials, can reduce the service life. Temperatures below freezing can also contribute to durability problems of saturated materials. A major objective in pavement design is to keep the base, subbase, subgrade, and other susceptible paving materials from becoming saturated or even being exposed to constant high moisture levels over time. The use of subsurface drainage has gained popularity over the past two decades, and many pavement agencies now routinely specify drainable pavement structures to reduce moisture-related problems in avements. In this research, need assessment of subdrainage was investigated by climatic parameters such as freezing index and annual precipitation, then material consideration for pavement layers such as base, subbase and separator layer were suggested based on drainage requirements. In this research, drainage design software based on AASHTO and FHW A manuals was also developed
Keywords:
Pavements ; Software ; Rainfall ; Freezing Index ; Drainage Coefficient

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