Abstract
Polyoxymethylene (POM), a novel type of fibre, can be incorporated into airport-pavement concrete as a reinforcing fibre. Airport pavements are thin-plate concrete structures continuously subjected to various complex random loads. Thus, understanding the fracture behaviour of POM-fibre-reinforced concrete under various strain rates is essential. In this study, ordinary airport-pavement concrete and POM-fibre-reinforced airport-pavement concrete were subjected to three-point bending fracture tests at five strain rates (10−6, 10−5, 10−4, 10−3 and 10−2 s−1), and the effects of fibre content and strain rate on the fracture performance of these concrete were systematically investigated. The results showed that POM fibres could enhance the crack resistance of concrete used in airport pavements; for a POM fibre concentration of > 1.2 vol%, the fracture toughness increased by ∼ 50 %. The analysed critical crack propagation rates demonstrated the ability of POM fibres to inhibit fracture propagation. Although PFAPC showed distinct strain-rate-dependent fracture characteristics, this dependency weakened as the fibre concentration increased. Finally, statistical analyses of the fractured surface were performed to assess the fracture behaviour of PFAPC under various stresses and quantify the contribution of POM. These results provide a critical foundation for the practical application of PFAPC in airport pavements.
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