Investigation of In-Place Asphalt Film Thickness and Performance of Minnesota Hot Mix Asphalt Mixtures

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Date Created
2009-06
Report Number
P2009-01
Description
Two methods for calculating the aggregate surface areas, the Surface Area Factor and Index methods, are discussed in this research and the results are further used to compute an average asphalt film thickness in asphalt mixtures. Field performance data from six Minnesota routes and MnROAD, including both coarse and fine gradations, were analyzed to determine significant correlations between asphalt film thickness values and the performance of asphalt mixtures. The analysis showed that the asphalt film thickness is a significant factor affecting the rutting performance for asphalt mixtures. However, the pavement performance is also affected by many other factors such as traffic level and surrounding environment. More research work is needed to investigate the relationship between the asphalt film thickness and the other performance parameters of asphalt mixtures such as fatigue cracking.

Traffic Flow Modeling, Simulation, and Signal Timing Plans Evaluation of the Miller Hill Corridor

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Date Created
2002-12
Report Number
P2003-02
Description
Traffic flow study of the Miller Hill corridor on Highway 194 between Arlington Avenue and Haines Road, the most heavily traveled and congested roadway in the Duluth area. The study includes preliminary data collection using a non-intrusive Remote Traffic Microwave Sensor (RTMS), traffic flow modeling, traffic simulation and development of an efficient traffic signa l light timing plan. The author develops a reasonably accurate model to estimate traffic flow, which is used in association with the RTMS and a database system to conduct real-time traffic simulations. Results of the simulation were used to develop a traffic-signal optimization plan with Synchro 5.0 software. Discussion of problems faced and how improvements could be made through further research. The author concludes with a proposal that recommends the adoption of the newly developed signal-timing plan to alleviate the traffic congestion on the Miller Hill corridor.

Findings of Facts and Conclusions: Appendix A: Public Comments and Summary of Public Involvement

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Date Created
2018-05
Description
This appendix contains: • Comments from the Metropolitan Council, dated May 30, 2018 • Comments from the Minnesota Pollution Control Agency, dated May 30, 2018 • Comments from the Ramsey-Washington Metro Watershed District, dated May 24, 2018 • Public Comments from the May 24, 2018 Open House • Summary of Public Involvement

Findings of Facts and Conclusions: I-694/I-494/I-94 Interchange Improvements

Date Created
2018-07
Description
Based upon the information in the record, which comprises the Environmental Assessment Worksheet (EAW) for the proposed project, related studies referenced in the EAW, written comments received, and other supporting documents included in this Findings of Fact and Conclusions document, MnDOT makes the following Findings of Fact and Conclusions

Production and Characterization of Mycorrhizal Fungal Inoculum

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Date Created
2004-07
Report Number
P2004-01
Description
The aim of this research is to produce a local, diverse mycorrhizal inoculum for commercial production for use in the Minneapolis/St. Paul area. In earlier studies, spores of several arbuscular mycorrhizal fungal (AMF) species were isolated from a Minnesota remnant prairie and identified by morphological features. For each species, single spore cultures were established and stored in the cold for 6 to 7 years. Objectives of this project were to produce pot cultures from the single spore cultures and to recommend AMF species for commercial production. To check the identity of the fungi before and after inoculum production, genetic identification of fungi used to develop the inoculum should be performed. The extraction and preservation of DNA of AMF species were done. DNA analysis showed general agreement between the morphological and molecular identification of the spores and their placement in genera. However, results suggested that some species placement might not be consistent where these comparisons can be made. Further research may result in the re-naming of some species. Several AMF species are recommended as candidates for commercial inoculum production based on production of spores in pot cultures, on their longevity in cold storage, and in some species on molecular traits.

Expanded Use of AVL/GPS Technology

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Date Created
2022-12
Report Number
CR20-04
Description
Summer road maintenance is a critical activity for highway maintenance agencies that involves a wide range of maintenance and construction vehicles that can be active at any given time, which makes vehicle and maintenance asset management challenges. Automated Vehicle Location (AVL) and Global Positioning Systems (GPS) technologies installed in winter maintenance vehicles have the potential to support summer road maintenance vehicles to improve asset tracking and management practices, as well as other purposes such as process automation and paperwork reduction for field staff in terms of activity reporting. The use of AVL/GPS systems to support both winter and summer maintenance activities can help justify the expenses incurred with respect to hardware / software acquisition and training costs across a wide range of applications. This report continues building upon prior Clear Roads research and helps highway maintenance agencies optimize the value gained from the acquisition of AVL/GPS systems by deploying them year-round, rather than being limited to winter maintenance operations. This report summarizes agencies’ experiences and lessons learned in using AVL/GPS technologies in summer and year-round maintenance activities. It also highlights the types of issues other highway maintenance agencies should consider prior to system procurement, provides guidance for successful transition and implementation of the technology, and serves as a possible template for agencies to get the best value out of different levels their AVL/GPS applications.