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原文传递 Precision of Biodegradable Solvents in Determining Asphalt Content and Aggregate Gradation; Final rept

题名：	Precision of Biodegradable Solvents in Determining Asphalt Content and Aggregate Gradation; Final rept
作者：	Jeng, Y. S.; Kim, S. C.
关键词：	Hot mix paving mixtures; Solvent extraction; Biodegradation; Solvents; Precision; Asphalt pavements; Concentration(Chemistry); Road materials; Aggregates; Highway maintenance; Limestone; Sieves; Grain size
摘要：	Solvent extraction method (i.e., centrifuge method and reflux method) using chlorinated solvents such as 1,1,1-trichloroethane, trichloroethylene etc. have been a regular practice to determine the asphalt content and aggregate gradation for several decades for hot mix quality control. Chlorinated solvents, however, are now known to be suspected carcinogens, which may have detrimental effects on the health of persons exposed to them. As a result, organic biodegradable solvents will be the ultimate alternatives to replace the chlorinated solvents in the centrifuge extraction method, since most of the biodegradable solvents are non-toxic, non-carcinogenic, and do not contribute to the depletion of the Earth's stratospheric ozone layer. The effectiveness of biodegradable solvents was evaluated using centrifuge extraction method in this project. It was found that biodegradable solvents were less effective in extracting asphalt compared to chlorinated solvents such as 1,1,1-trichloroethane. However, despite the fact that the basic chemical compositions of different biodegradable solvents are very different, their effectiveness in determining asphalt content and aggregate gradation was found to be about the same.
总页数：	102p
报告类型：	科技报告