WTI’s Bozeman Commuter Project is working with Bozeman neighborhoods to implement Pop-up Traffic Calming projects to reduce drivers speeds on residential streets, and bring more visibility to bikes and pedestrians. This weekend residents of Northwest Bozeman in the Valley Unit neighborhood will be setting up a temporary demonstration of curb extensions and a traffic circle at three intersections near Valley Unit park. Data will be collected via intercept surveys and radar speed detection units to better understand how these designs can reduce vehicle speeds and increase safety for local residents and those traveling by bike, foot, bus, stroller, walker or wheelchair.
Related News Story: AARP Highlights Bozeman Traffic Calming Project in National Publication
In ongoing efforts to expand international research partnerships, WTI is developing a memorandum of agreement with Francesca Russo, PhD of the Road Infrastructures and Transportation Systems Department of Civil, Construction and Environmental Engineering (DICEA) at the University Federico II of Naples Scuola Politecnica e delle Scienze in Naples, Italy. Led by WTI Program Manager Laura Fay, this collaboration was born from service on the Transportation Research Board (TRB) Low Volume Roads Committee, and will focus on cooperative studies and research exchanges.
WTI Research Engineer Natalie Villwock-Witte recently had the opportunity to meet some of the staff on the campus. Everyone at WTI is looking forward to working with these new partners, and seeing what innovations emerge from sharing ideas between the two countries.
Concrete can be susceptible to expansive reactions between alkalis in the Portland cement and reactive forms of silica in the aggregates, which can ultimately reduce the lifespan of the concrete used in pavements and other structures. When this occurs, it can result in costly repairs or even replacement of infrastructure. While alkali-silica reactivity (ASR) has been documented as an issue in many states, little work has been conducted to determine the presence/potential of ASR in Montana. The primary objectives of the proposed research are to evaluate the potential for ASR in the state of Montana, and to develop a testing protocol for identifying potential reactive aggregates. This research will also identify/document existing ASR damage in the state and investigate the potential underlying geological features that may contribute to the presence of reactive aggregates. Finally, this research will evaluate potential techniques used to mitigate the damaging effects of ASR.
Sponsored by the Montana Department of Transportation (MDT), this research project will provide a better understanding of reactive aggregates (including severity) and a better understanding of potential ASR issues in the state of Montana. This information will be helpful in promoting sustainability and extending the service life of Montana concrete pavements and structures. Principal Investigator Mike Berry is conducting this research in partnership with MDT and the Montana Contractors Association.
Ultra-high performance concrete (UHPC) has mechanical and durability properties that far exceed those of conventional concrete. However, using UHPC in conventional concrete applications has been cost prohibitive, with commercially available/proprietary mixes costing approximately 30 times more than conventional concrete. Previous WTI research resulted in nonproprietary UHPC mixes made with materials readily available in Montana. These mixes are significantly less expensive than commercially available UHPC mixes, thus opening the door for their use in construction projects in the state. The Montana Department of Transportation (MDT) Bridge Bureau is interested in using UHPC in field-cast joints between precast concrete deck panels. The use of UHPC in this application will reduce development lengths, and subsequently reduce the requisite spacing between the decks and improve the overall performance of the bridge. Through this project, P.I. Michael Berry will build on the non-proprietary Phase I UHPC research he recently completed for MDT and focus on ensuring the successful application of this material in these field-cast joints.
If these mixes are viable for this application, Montana could take advantage of the cost savings of the non-proprietary mixes and ultimately improve the performance and durability of bridges. More information on this Phase II project is available here.
Geosynthetic materials are routinely used in transportation applications to facilitate construction, improve stability, and enhance longevity. Departments of transportation have generally had good experience with these products, although a robust and non-proprietary design process for geosynthetic reinforced paved roads is still lacking. The Montana Department of Transportation (MDT) believes that geosynthetics can be used responsibly to provide cost-savings on a number of upcoming highway construction projects in the state, based on their in-house experience as well as previous research and evaluation by WTI. MDT desires experimental evidence of performance for these typical projects in order to proceed with future designs.
Principal Investigator Steve Perkins is leading a new study to conduct full-scale indoor testing of reinforced pavement test sections using a traffic simulator to provide performance data and to evaluate a spreadsheet-based design tool that can be used to augment current design procedures. The results from this study can be directly implemented into future MDT highway construction designs having similar conditions to the test sections. These recommendations will pertain most directly to operational conditions where a stable construction platform is established over relatively weak subgrade when it is advantageous to reduce base course thickness in order to save both time and money.
To follow this project, visit its webpage on the WTI website.