Tag Archives: performance

Fiber-Reinforced Concrete’s Potential as a Performance Engineered Mixture

Reinforcing concrete pavement with structural fibers improves its durability and helps protect against potential faulting and cracking. MnDOT has used fiber-reinforced concrete (FRC) on some concrete bridge decks and pavements. Winter weather, freeze-thaw cycles and road salt, however, still hasten concrete deterioration. In a recent study, researchers evaluated FRC in the context of performance engineered mix design methods, giving MnDOT confidence in the parameters that FRC needs to meet to help withstand Minnesota’s harsh weather. 

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Improving Asphalt Performance and Durability With Superpave 5

Minnesota’s harsh climate requires dense, durable asphalt to avoid frequent maintenance and replacement. Asphalt mixes as designed in the laboratory, however, don’t always perform consistently in the field. A new Superpave mix shows promise for providing cost-effective, high-performing pavements for state roadways.

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Using Chemical Adhesives to Post-Install Epoxy-Coated Rebar in Concrete

The Minnesota Department of Transportation (MnDOT) had suspended the use of post-installed epoxy-coated rebar for concrete barrier repairs as a precautionary measure because chemical adhesives used in the process are not designed for use with coated bars. But laboratory testing (conducted in a recent MnDOT-sponsored research study) has now shown that using these adhesives with coated rebar for post-installation works well and provides a safety level 200 to 300 times that predicted by manufacturer specifications. MnDOT is considering research recommendations to modify the installation process in order to resume using coated rebar in post-installed concrete crash barriers.

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