详情

Use of Rejuvenator Prior to Chip Seal on Aged Flexible Pavement

项目名称：	Use of Rejuvenator Prior to Chip Seal on Aged Flexible Pavement
摘要：	Emulsions are used as tack coats to bond hot-mix asphalt layers and in chip seals to bind aggregates. The rate of emulsion application is critical to the performance of both tack coats and chip seals and hence, is an important design factor. Emulsion is often applied to aged flexible pavements in North Carolina. Oxidative aging embrittles asphalt binder near the pavement surface which increases top down cracking and raveling, leaving the pavement surface porous and dry. Consequently, when emulsion is applied to an aged flexible pavement, a portion of the applied emulsion will be absorbed by the existing pavement. To compensate, the current practice is to adjust the required target Emulsion Application Rate (EAR) used in the construction based on visual inspection of the existing pavement surface. This current practice is subjective and visual appearance cannot be tied directly to surface dryness. Therefore, an improved method is needed to inform adjustment of the target EAR during construction to account for emulsion lost to absorption. Improved selection of the design EAR will result in prolonged pavement service life, potentially resulting in significant economic savings. The objectives of the proposed research project are to do the following: (1) Determine the rate by which pavements absorb emulsion as a function of pavement surface characteristics; and (2) Develop guidelines for the adjustment of the target EAR to account for emulsion absorption based on quantitative measurement of the existing pavement surface characteristics.
状态：	Active
资金：	$258,427
资助组织：	North Carolina Department of Transportation
管理组织：	North Carolina Department of Transportation
项目负责人：	Bolyard, Steven
执行机构：	North Carolina State University, Raleigh
主要研究人员：	Castorena Ph.D., Cassie Hintz
开始时间：	20170801
预计完成日期：	20190731
实际结束时间：	0