The City of Minneapolis is constructing a test section of a bituminous underseal in 2019. The section is broken into three 660-foot segments. The goal of this research is to monitor the performance of the test sections and determine the benefit, if any, gained from the application of the bituminous underseal. The appeal of a bituminous underseal is it combines a chip seal with a mill-and-overlay. Both techniques are... more »
Materials and Construction
Street and utility reconstruction projects provide increased value to surrounding land use. It is often difficult for property owners to understand street improvement assessments relative to the increased value. Training/education tools are needed to communicate the broad range of benefits provided on a typical street reconstruction through a residential neighborhood. State Aid Pre-Screening Meeting input: A broader... more »
The performance of concrete and bituminous pavement needs to be better understood and compared. Performance curves are need to compare roadway lifecycle attributes including pavement deteriorization.
State Aid Pre-Screening Meeting input:
Bituminous pavement deterioration curves and comparing to concrete pavement roads
Asset with identification and/or development of training to assist construction staff in navigating electronic environments to further promote construction's ability to advance 3D models, asset management in a GIS environment, and other digital e-construction administration methods.
Real field data are lacking for a direct comparative performance evaluation of Mesabi (taconite) friction aggregate and calcined bauxite in high friction surface treatments (HFST) applications. Calcined bauxite has been given a preferred status relative to HFST usage by FHWA, but is imported, expensive, and energy-intensive to produce. A recycled/byproduct alternative like Mesabi HFST aggregate may still provide adequate... more »
The goal of this research is to determine the layer thicknesses and moduli for a layered road system based on FWD test results. Current back-calculation techniques for determining these results use the wrong theory, i.e., elasto-statics, not elasto-dynamics, and the wrong boundary condition (constant traction, not constant displacement). The purpose of this research is to improve the solution to include the correct... more »
Mechanical Concrete®️ is a geo-synthetic aggregate confinement technology. It confines all types of aggregate materials in a free standing, self-supporting geo-cylinder, similar to a single geocell. Mechanical Concrete®️ geo-cylinders offers strength, scalability and economy for crushed stone and aggregate materials confinement systems. Its geo-cylinder is manufactured by removing both sidewalls... more »
A "Buy Clean MN" bill was proposed in 2019 legislature to require MnDOT to use materials with the lowest Global Warming Potential (GWP). The language was copied from a recently passed bill in CA that requires use of lowest GWP materials based on a life cycle assessment of emissions and uses Environmental Product Declarations (EPDs) to verify results. MnDOT has targets to reduce construction emissions and we have been... more »
The first phase would summarize the current performance of roadways already built using tire derived aggregate (TDA). There are varying experiences from successful installations across the region and country regarding how much material is required to successfully surcharge the TDA before the embankment can be successfully surfaced. After completion of phase 1, phase 2 would be done if test sections are needed. This... more »
A new field moisture measurement device would be built based on prior research, trialed on construction projects, and a draft test standard developed. This new field moisture device would provide a fast and accurate method to determine the optimum moisture for compacting soils without laboratory Proctor testing or the use of a sand cone or nuclear density gauge. This new field test would determine if the construction... more »
Expand research started by University of Minnesota Twin Cities campus Remote Sensing Lab to automatically extract footprints of buildings, roadway edges, and other features from aerial imagery (photography) and laser generated point clouds, that currently require a manual identification and interaction during photogrammetric mapping.
There is a need to quantitively assess the permeability of aggregate materials both for design and during construction when materials do not meet specification. A simple tool to assess permeability based upon gradation, coarse crushing percentage, fine aggregate angularity, and material type would uses in both design requirements and materials acceptance.