Effects of Fiber Type and Fiber Volume Content on Frost Resistance of Fiber-Reinforced Concrete in Airport Pavement

Abstract

Based on the discussion of fiber reinforced pavement concretes and frost resistance of airport pavement, and aiming at the different view of frost resistance of steel fiber reinforced concrete and the lack of comprehensive research of frost resistance of synthetic fiber reinforced concrete, this paper researched the effects of adding steel fibers and polypropylene fibers into pavement concrete and different fiber volume contents on frost resistance of concrete by fast freezing and thawing test. Results show that by adding polypropylene fibers, the improving effects on frost resistance of pavement concrete is better than by adding steel fibers. When adding polypropylene fibers into pavement concrete, there are coupled effects, which is crack resistance effect and weak interface zone effect, so that the optimum fiber volume content exists. Adding 1.0% polypropylene fibers into pavement concrete can achieve the best improving effect of frost resistance, and its relative dynamic elastic modulus is high to 98.01% after 300 freezing and thawing cycles.