Abstract

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Title:: Experiment on Strength and Flexural Toughness of Hybrid Fiber Reinforced Concrete for Airport Pavement

Author(s):: DENG Zong-cai; GENG Xue-hui; LIU Yan; LAN Ming-zhang; College of Architecture and Civil Engineering, Beijing University of Technology

Keywords:: airport pavement; flexural toughness; hybrid fiber reinforced concrete; strength; volume ratio

Abstract:: In order to reduce the brittleness of airport pavement concrete, the toughness of pavement concrete was improved by mixing high performance coarse polyolefin fiber (PP) and fine polyvinyl alcohol fiber (PVA). By four point bending test, the loaddeflection curves of beam specimens were obtained, and the improving effects of mixing ratio of two different fibers on the flexural toughness of threegraded airport pavement concrete were analyzed. The results show that the flexural toughness of concrete can be significantly improved by fiber mixing. There are 2 times of peak values of loaddeflection curves when PP is mixed. When volume ratio of PVA is 0.2% or 0.4%, with the increase of PP mixing ratio, the toughness index values P3₀₀, P₇₅, P₅₀show an increasing trend. The late toughness index values P₇₅, P₅₀can be improved more obviously when PP mixing ratio increases. The firstpeak strength can be more significantly improved when PVA mixing ratio increases. When the volume ratios of PP and PVA are 1.1% and 0.4% respectively, the flexural toughness of airport pavement concrete is most obviously improved.