High Friction Surface Treatments (HFST) are pavement treatments that involve applying a high-quality aggregate and binder to pavement surfaces to help maintain friction. The treatment has significantly reduced crashes and injuries in wet and dry road conditions in high crash areas. However, HFST can be a costly treatment. Researchers, funded by MnDOT and the Local Road Research Board, are evaluating if taconite, a readily available Minnesota byproduct, can be an effective alternative treatment in low volume areas.

On July 25^th, members of the technical advisory panel met at MnROAD, MnDOT’s pavement test track, in Otsego, MN to test different friction aggregates applied to pavement markings and colored pavements. Operators drove a surface friction tester known as SCRIM or the Sideway Force Coefficient Routine Investigation Machine, over the test strips multiple times at different speeds to measure the friction of each strip. Watch the SCRIM in action, in this video from WDIO-Duluth.

Up next, researchers will assess the performance of each test aggregate and review the installation and maintenance costs of each treatment. Additional evaluation criterions include skid resistance (dry and over ice and snow), wear over time, and color of the aggregate on pavements.

Results will help Minnesota road agencies decide which type of friction treatment is most suitable for them.

To receive updates about the project, visit MnDOT’s Office of Research & Innovation to subscribe.