Fiber reinforced concrete, Specifications
Structural fibers improve the long-term performance of concrete pavements and overlays and potentially are useful to reduce the slab thickness. The state of Minnesota has been using various structural fibers in concrete pavements and overlays for many decades at MnROAD, with limited placement on mainline concrete pavements. The current specification for the fresh concrete properties is not fiber reinforced concrete specific and based on the nearly century-old slump, air content and compressive strength test results; it does not also properly address the durability issues of concrete. As the state of Minnesota and many other states are moving towards the implementation of the performance engineered mixture (PEM) design, it is essential to develop a new specification for fiber reinforced concrete.