Pavement management database preparation and case studies for Cold In-place asphalt recycling in Iowa

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2022-12
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Zhang, Yuhan
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Jahren, Charles
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Ceylan, Halil
Wang, Kejin
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With the development of the economy and technology, more and more vehicles were produced, and more and more vehicles began to drive on roads, and as a result, pavements are under more pressure compared to 10 to 20 years ago. Maintaining a safe, efficient, environmentally friendly, and cost-effective roadway system by rehabilitating the existing surface is becoming increasingly important. Among various pavement rehabilitation methods, Cold in-place recycling is a viable method used to extend the life of relatively thick asphalt concrete pavements, and it is a long-lasting solution for heavily cracked pavements saving up to 50% of the cost of other repair opinions. The cold in-place recycling process involves milling off 2-4 inches of the existing hot mix asphalt surface layer and mixing it with a stabilizing agent like foamed asphalt, Portland cement, asphalt emulsion, or a combination of stabilizers and compacting the recycled materials into a newer base layer. The recycled layer is then covered with an asphalt overlay, a thin HMA overlay, or a bituminous surface treatment to protect the pavement from environmental and load factors. The history of cold in-place recycling could date back to the early 1900s, when engineers would use rippers to rip up pavement and place it back down. Oregon, New Mexico, Kansas, and Pennsylvania were early pioneers of using cold in-place recycling in the 1970 and 1980s. Since then, the cold in-place recycling CIR process has been greatly enhanced and improved with the development of engineered emulsions, the improvements in equipment, for example, the CIR train, and the development of the foamed asphalt. Studies have shown that recycled materials can be both a cost-effective and environmentally friendly solution [1]. In Iowa, with the dwindling supply of quality aggregates and overall good performance, CIR is a much-needed sustainable alternative to many pavement rehabilitation techniques, and over time, more and more projects in Iowa have used the CIR rehabilitation method. Also, Iowa researchers found that roadways using CIR rehabilitation typically last, on average, 15 to 26 years on roadways with <2000 ADT [2]. Even though most CIR-related research has been focused on improving the CIR performance and CIR project selection, etc., it is also very important to pay attention to the long-term evaluation of the CIR and the factors that would influence the CIR performance. In Iowa, with the help of the PMIS database, researchers could monitor the CIR performance over time. When using the Pavement Management Information System (PMIS) database, an important process is to perform a data preparation process since some of the raw project data may not accurately represent the actual performance of the roadways or the process of providing usable analytical results. This document includes details on how to do the data preparation process when using the Pavement Management database to analyze roadway performance.
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2022
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