Study on dynamic tensile properties of short-cut carbon fiber reinforced concrete

doi:10.19936/j.cnki.2096-8000.20220928.014

Abstract

Abstract: Due to the non-uniform tension and compression strength of concrete, carbon fiber can be added to concrete to improve its static tensile behavior and increase the tension-compression ratio. In view of the destructive consequences of impacts and explosions, the effects of the stress rates and carbon fiber contents on the dynamic tension behavior of concrete were investigated in this paper. And from the mesoscopic level, the difference between the dynamic and static properties of its tensile strength is discussed. The dynamic splitting tests of concrete with the fiber contents of 0‰, 1‰, 2‰, and 3‰ were carried out by using a split Hopkinson pressure bar (SHPB) device with a diameter of 74 mm. We found that with the increase of fiber content, the static tensile strength of concrete increases obviously, but the increased amplitude tends to decrease. The dynamic tensile strength and dynamic increase factor (DIF) both increase with the increase of stress rate, but the growth rate slows down, showing an obvious rate effect. There are significant differences in the influence of carbon fiber on the dynamic and static strength of concrete. In the design of concrete mixing proportion, the content of carbon fiber should be appropriately selected to meet the requirements of dynamic and static mechanical properties.

Key words: carbon fiber, SHPB, tensile strength, DIF, mesoscopic, concrete

CLC Number:

TB332

LIU Yu-juan, WANG Li-juan. Study on dynamic tensile properties of short-cut carbon fiber reinforced concrete[J]. COMPOSITES SCIENCE AND ENGINEERING, 2022, 0(9): 97-101.

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