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Funding Agency: Michigan Department of Transportation
Amount: $164,968.37
10/1/2021 – 3/31/2023
Student Researchers: Blane Johnston, Natalia Piotrowski, Justin Przeslawski
The primary objectives and activities of this project are; 1. Establish site-specific criteria (such as soil type, drainage characteristics of the site, traffic levels,etc.) where subgrade stabilization should be considered. This may be different for fine-grained vs. coarse-grained soils. It may also be different for situations where the goal is establishing a solid construction platform versus stabilizing for long-term performance. Cost/benefit analysis may also be a part of the decision process. 2. Establish the best materials to use as stabilization agents for fine-grained and coarse-grained soils. 3. Propose which existing mix design methods, mix design criteria (such as strength), construction methods, and testing protocols/criteria for construction acceptance should be used and when. A decision matrix or table is desirable. 4. Establish inputs for the stabilized subgrade to be used in the mechanistic-empirical pavement design and AASHTO 1993 pavement design methods.
Sub Consultant to Resource Recycling Systems, Inc.
09/28/2021-5/31/2022
The primary objectives of this research study is to evaluate the long-performance of scrap tire modified asphalt projects in Michigan. The technical evaluation team for this projects include researches from Lawrence Technological University, Michigan Technological University, and Michigan State University.
Funding Agency: Michigan Department of Transportation
Amount: $169,010.18,
5/1/2019 – 12/31/2020
Student Researches: Megan Roden, Alexis Willing, Logan Delonis, Blane Johnston, Ali Abdulla, Chris Bragg
This research was initiated with a comprehensive literature review and a survey of the state-of-the-practice through an online survey of state DOTs and other highway agencies. Considering the findings from the literature review and the survey, a field and laboratory research program was developed to assess the extent of the problem and to develop solutions to mitigate the concerns. The field investigation in this study was designed to supplement previously collected MDOT data. The field investigation included collecting water samples from underdrain outlets after significant rain events. The collected water samples were tested in the field for pH and total dissolved solids (TDS) content. Samples were then transferred to the laboratory for chemical analysis. The chemical analysis was conducted to determine if the leachate contained any hazardous materials. The original research plan was expanded to include a laboratory column leaching testing program to quantity gaps observed in the field investigation program. The column leaching test simulated rainwater seeping into the pavement base through cracks and joints and then leaching out through underdrain outlets. In the laboratory investigation, several pavement bases configurations were evaluated and they included limestone, SA, and RCCA bases as well as solutions to mitigate leaching problems.
Amount $50,000
August 2015 – August 2016
Student Researcher: Ali Abdulla
Funding Agency: Michigan Department of Transportation
Amount: $213,518
April 2013-June 2016
Student Researcher: Tarik Binoy
Due to rising costs of good quality acceptable materials for remove/replace options and traditional subgrade stabilization materials, MDOT is in need to identify potential recycled materials to treat unacceptable subgrade soils. Use of recycled materials may not only provide less costly alternatives for subgrade stabilization, their use may also alleviate landfill disposal challenges.
This research study is aimed at identifying short-term and long-term advantages and disadvantages associated with subgrade stabilization using recycled materials such as Cement Kiln Dust (CKD), Lime Kiln Dust (LKD), flash, concrete fines and mixtures of LKD and FA. An extensive laboratory testing program was conducted to determine suitability of the above recycled stabilizers for subgrade stabilization for common problematic soils found in Michigan. The laboratory investigative program involved determining the basic soil properties, developing mix designs to select proper stabilizer percentage for each soil type, CBR testing to determine pavement design parameters, and laboratory freeze/thaw testing to determine durability of stabilized subgrade sections. A limited field investigation was performed to assess insitu performance of stabilized subgrades. Based on the findings of both investigations, stabilizers were selected for long-term subgrade stabilization for different soil types and their associated pavement design inputs were determined. A design matrix with cost considerations was also developed to aid the selection of subgrade treatment options.
Funding Agency: Michigan Department of Transportation
Amount: $186,661
April 2013-September 2016
The following objectives were identified as primary tasks of this project:
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