Bending Properties of Polyoxymethylene Fiber Airport Pavement Concrete under Different Strain Rates

Abstract

Abstract: The mechanical behavior of airport pavement concrete structure under different loads is greatly affected by strain rate. In order to study the effect of strain rate on the bending properties of polyoxymethylene fiber airport pavement concrete (PFAPC), the bending deflection, bending modulus, bending strength and toughness index of PFAPC under different strain rates (10^-5~10^-1 s^-1) were analyzed by four-point bending test, and the microstructure of fracture fibers was observed and the failure mode of fibers under different strain rates was summarized. The test results show that the bending peak strength, ultimate bending deflection, and bending modulus of PFAPC increase with the increase of strain rate. Compared with the peak strength, the strain rate has little effect on the residual strength of PFAPC, but the overall trend is upward with the increase of strain rate. Compared with the ultimate bending deflection, the peak deflection fluctuates with the increase of strain rate. The bending modulus increases with the increase of strain rate. The polyoxymethylene fiber is mainly in the pull-out failure mode under the action of each strain rate. PFAPC absorbs a large amount of energy under the impact of vehicles and aircraft, showing a certain ductile failure characteristics, and a good bending toughness.

Key words: airport pavement concrete, polyoxymethylene fiber, strain rate, bending property, fracture morphology

CLC Number:

U414

WANG Zhenhui, GUO Rongxin, YAN Yong, ZHANG Jiuchang, LI Lishan. Bending Properties of Polyoxymethylene Fiber Airport Pavement Concrete under Different Strain Rates[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(7): 2268-2274.

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