详情

Documenting the Impact of Aggregate Quality on Hot Mix Asphalt (HMA) Performance

项目名称：	Documenting the Impact of Aggregate Quality on Hot Mix Asphalt (HMA) Performance
摘要：	In Texas, the Surface Aggregate Classification (SAC) system is currently used to qualify aggregates for hot mix asphalt (HMA), which ranks aggregates into SAC A, B, or C based on their magnesium soundness and acid insolubility values. Only SAC A aggregate is recommended on high volume roads. However, this classification has led to shortages of surfacing aggregates and increment in the cost of premium HMA surfacings because limestone, a main Texas aggregate source, has a SAC B designation due to the acid insolubility requirement. It is TxDOT�s long-term goal to revise and possibly replace the existing SAC system with a system more related to in-service field performance. The main objective of this study is to provide the fundamental laboratory and field performance data required to make major changes of the current SAC system and provide guidelines for the enhancement of the Texas aggregate screening/selection criteria. To accomplish these objectives, the researcher team will use the existing databases (mainly the Project 0-6658 database with over 70 in-service highway test sections across the State and other in-house district databases) to correlate field performance in terms of skid resistance, as well as rutting and cracking, with the aggregate properties � supplemented with limited field data (skid) collection.
状态：	Active
资金：	$250000
资助组织：	Texas Department of Transportation
项目负责人：	Kuhr, James
执行机构：	The University of Texas at Tyler
主要研究人员：	Walubita, Lubinda F
开始时间：	20170901
预计完成日期：	20201031
实际结束时间：	0