Evaluation of Otta Seal Surfacing for Low-Volume Roads in Iowa - Phase II
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
Language
- English
Project
- Status: Active
- Funding: $349,601
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Contract Numbers:
Addendum 665
TR-753
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Sponsor Organizations:
Iowa Department of Transportation
800 Lincoln Way
Ames, IA United States 50010 -
Managing Organizations:
Iowa Department of Transportation
800 Lincoln Way
Ames, IA United States 50010 -
Project Managers:
Goetz, Vanessa
Moore, Brian
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Performing Organizations:
Institute for Transportation
2711 South Loop Drive, Suite 4700
Ames, Iowa United States 50010-8664 -
Principal Investigators:
Ceylan, Halil
Kim, Sunghwan
Jahren, Charles
Zhang, Yang
- Start Date: 20180701
- Expected Completion Date: 20210630
- Actual Completion Date: 0
Subject/Index Terms
- TRT Terms: Road materials
- Subject Areas: Construction; Maintenance and Preservation;
Filing Info
- Accession Number: 01675172
- Record Type: Research project
- Source Agency: Iowa Department of Transportation
- Contract Numbers: Addendum 665, TR-753
- Files: RIP, STATEDOT
- Created Date: Jul 19 2018 12:12PM