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原文传递 DEVELOPMENT OF AN APPROACH TO DETERMINE THE ALLOWABLE RAP BINDER CONTENT IN HOT RECYCLED BITUMINOUS MIXES

题名：	DEVELOPMENT OF AN APPROACH TO DETERMINE THE ALLOWABLE RAP BINDER CONTENT IN HOT RECYCLED BITUMINOUS MIXES
正文语种：	eng
作者：	ANKIT SHARMA;G.D. RANSINCHUNG R.N.;PRAVEEN KUMAR
作者单位：	Civil Engineering Department Indian Institute of Technology Roorkee Uttarakhand;Civil Engineering Department Indian Institute of Technology Roorkee Uttarakhand;Civil Engineering Department Indian Institute of Technology Roorkee Uttarakhand
摘要：	This study developed an approach to determine the allowable range of Reclaimed Asphalt Pavement (RAP) content for hot recycling in bituminous pavements. The RAP material was procured from Nazimabad, Uttar Pradesh, and the RAP binder was recovered. The soft paving grade, i.e., VG-10, was used as a recycling agent to achieve the final viscosity grade equivalent to the VG-40. The rheological characterization was done on recycled binders (blends of VG-10 and the RAP binder). Indian Roads Congress specification IRC: 120-2015 states two mixing rules to determine the desired RAP content in the hot recycled pavement. The first mixing rule is based on the viscosity of binders, and the second mixing rule is based on the Superpave rutting parameter G/sin5. Statistical analysis (Chi-square test) indicates that G/sin8 is a more accurate mixing rule than the viscosity-based mixing rule. Moreover, the Performance Grade (PG) high temperature-based mixing rule was also analyzed and compared. It was statistically proved that out of the three mixing rules, the true high PG temperature-based mixing rule is the most accurate in predicting the PG of the resultant recycled binder. However, the high PG mixing rule can only provide minimum RAP content. To determine the upper limit i.e. maximum RAP content, a contour plot was traced to estimate the maximum and minimum RAP content for a recycling project. The findings will be helpful for the practicing engineers to finalize the RAP content for hot recycling of asphalt pavements.
出版年：	2022
期刊名称：	Indian Highways
卷：	50
期：	10
页码：	19-25