A practical shear rate on modified asphalt binders for optimum compaction temperature determination in asphalt mixture design

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• 作者：Han Geng ; Lihan Li
• 刊名：Materials and Structures
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：50
• 期：1
• 全文大小：817 KB
• 刊物类别：Engineering
• 刊物主题：Structural Mechanics
  Theoretical and Applied Mechanics
  Mechanical Engineering
  Operating Procedures and Materials Treatment
  Civil Engineering
  Building Materials
  
• 出版者：Springer Netherlands
• ISSN：1871-6873
• 卷排序：50

文摘

This paper is attempted to establish a practical shear rate for optimum compaction temperature determination of modified asphalt binders in asphalt mixture design. Viscosity of seven modified asphalt binders was measured, optimum compaction temperatures of eight asphalt mixtures were obtained and the shear rate range during roller compaction was estimated. Results showed that in the shear rate measuring range of commonly used Brookfield viscometer (0.3–25 s−1), viscosity characteristics at 25 s−1 showed the best similarity to viscosity characteristics during roller compaction in the shear rate range of 10–130 s−1. Also, viscosity at the shear rate of 25 s−1 exhibited the best correlation with the minimum compaction energy index of asphalt mixtures at optimum compaction temperatures. Based on the results above, 25 s−1 was suggested as the practical shear rate, providing a direct viscosity measurement for optimum compaction temperature determination of modified asphalt binders in asphalt mixture design.KeywordsModified asphalt binderOptimum compaction temperatureShear rateViscosityCompaction energy index