Experimental Study on Dynamic Tensile Properties of Macro‑Polypropylene Fiber Reinforced Cementitious Composites

Guoliang Yang; Jingjiu Bi; Zhiwen Dong; Ying Li; Yi Liu

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자료유형: 학술저널

저자정보: Guoliang Yang (China University of Mining and Technology-Beijing) Jingjiu Bi (China University of Mining and Technology-Beijing) Zhiwen Dong (China University of Mining and Technology-Beijing) Ying Li (China University of Mining and Technology-Beijing) Yi Liu (China University of Mining and Technology-Beijing)

저널정보: 한국콘크리트학회 International Journal of Concrete Structures and Materials International Journal of Concrete Structures and Materials Vol.17 No.1

발행연도: 2023.1

수록면: 189 - 200 (12page)

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Using a high-speed photography system and a split Hopkinson pressure bar, macro-polypropylene fiber reinforced cementitious composites are tested to reveal the effects of the macro-polypropylene fiber volume fraction and loading rate on the dynamic tensile strength and failure mode. We also analyze the functional relationship between the dynamic tensile strength, loading rate, and fiber volume fraction, and study the splitting failure process using digital image correlation technology. The evolution law of the strain and displacement fields of the specimens is obtained, and the effect of the fiber volume fraction on the crack initiation strain value is quantitatively studied. The results show that the appropriate fiber content (1.5–2%) can significantly improve the dynamic tensile strength, while a higher fiber content (2.5%) leads to deterioration of the specimen. Adding macro-polypropylene fiber prevents the specimen from undergoing central tensile fracturing under dynamic loading, and distributes the impact load more evenly, thus improving the ability of the specimen to resist cracking.

#Polypropylene fiber #Fiber cement-based material #Fiber volume fraction #Dynamic tensile strength #Digital image correlation method

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