返回Google圖書搜尋

RAP Stockpile Management and Processing in Texas

Fujie ZhouGautam DasThomas ScullionSheng Hu

其他書名	State of the Practice and Proposed Guidelines
出版	Texas Transportation Institute, Texas A & M University System, 2010
URL	http://books.google.com.hk/books?id=ipQVYAAACAAJ&hl=&source=gbs_api

註釋In addition to conserving energy and protecting the environment, the use of reclaimed asphalt pavement (RAP) can significantly reduce the increasing cost of asphalt mixes. However, one of the key problems with RAP mixes is its variability, which is the main reason why many states including Texas Department of Transportation (TxDOT) limit the use of RAP. In most circumstances, RAP variability is closely related to RAP stockpiles management and RAP processing. This report first documents the state of the practice of RAP stockpile management and RAP processing in Texas. In contrast to the RAP stockpiles owned by TxDOT, most contractors currently combine materials from different RAP sources and sometimes waste into a single pile and then process it into a usable material by crushing and/or fractionation. During the first year of this study it was found that the contractors visited are doing a good job of managing the processed RAP stockpiles. To quantify the RAP variability, samples were collected from several stockpiles and evaluated using asphalt ignition oven test. The results showed that both TxDOT's and contractors' RAP materials, in terms of aggregate gradation and asphalt content, are consistent and slightly better than those reported at the national level.