详情

Evaluation of Otta Seal Surfacing for Low-Colume Roads in Iowa - Phase II

项目名称：	Evaluation of Otta Seal Surfacing for Low-Colume Roads in Iowa - Phase II
摘要：	This proposed phase II research is a follow-up investigation of the recently completed TR-674 (IHRB-13-08), entitled, �Evaluation of Otta Seal Surfacing for Low-volume Roads in Iowa�. The primary objectives of this proposed phase II research are listed below:  To establish the recommended specifications including quality control/quality assurance (QC/QA) procedures for Iowa Otta seal construction projects through two concurrent research studies: (1) comprehensive laboratory evaluation & characterization and (2) field implementation projects Specific objectives established to achieve this primary objective include the following:  Evaluate various local aggregate types in Iowa suitable for Otta seal construction  Develop rational or engineered approach for determining the optimum application rates for asphalt binder and aggregate systems in Otta seal applications  Identify road surface/base preparation requirements before Otta seal application  Develop minimum requirements for aggregate layer thickness (with CBR ranges for subgrade strength) to establish Otta Seal selection for an unpaved road  Develop minimum requirements (i.e., PCI or SN ranges) to identify candidates for Otta Seal placement on existing HMA pavements  Identify test and control procedures for checking and calibrating actual field application rates of asphalt binder and aggregate  Evaluate rolling operations (e.g., number of passes) for achieving appropriate field compaction  Identify test procedures for determining curing times on Otta seals and recommend the optimum curing time between 1st and 2nd layer for double Otta seal construction  Evaluate the feasibility of using recycled materials (RAP or slag) as an alternative to virgin aggregate in Otta seal  Evaluate if Otta seal layers could be used as one of the holding strategy options for Iowa county roads
状态：	Active
资金：	$349,601
资助组织：	Iowa Department of Transportation
管理组织：	Iowa Department of Transportation
项目负责人：	Moore, Brian
执行机构：	Iowa State University, Ames
主要研究人员：	Zhang, Yang
开始时间：	20180701
预计完成日期：	20210630
实际结束时间：	0