Dynamic compressive and flexural behaviors of ultra-rapid-hardening mortar containing polyethylene fibers

• Autorzy: Chun Booki , Shin Wonsik , Oh Taekgeun , Yoo Doo-Yeol

Identyfikatory

DOI

10.1007/s43452-021-00233-3

• Języki publikacji: EN

Abstrakty

EN

In this study, the dynamic, compressive, and flexural behaviors of ultra-rapid-hardening mortar (URHM) containing 2% polyethylene fiber are investigated. The results confirm the robust strain-hardening behavior of URHM at an early age of 4 h. Its tensile strength, strain capacity, and g value at 4 h were found to be 7.3 MPa, 5.1%, and 297.5 kJ/m3, respectively. The compressive and flexural strength and toughness of URHM increased with the strain rate. A higher loading rate led to a greater increase in the strength; the rate sensitivity was higher during flexure compared to that during compression. The highest dynamic increase factor (DIF) of the compressive strength was 1.75 up to a strain rate of 115/s; the highest DIF of the flexural strength was 3.34 up to a strain rate of 96/s. Its deflection-hardening behavior was converted to deflection-softening behavior under impact loads having a potential energy of 392 J or greater. Furthermore, the greater potential energy led to a lower energy dissipation rate, and more energy remained in the system. The rate sensitivity of the URHM under compression was similar to that of other fiber-reinforced concretes; however, its flexural strength was less sensitive to the strain rate than that of the others.

Słowa kluczowe

EN

ultra-rapid-hardening mortar; polyethylene fiber; impact resistance; rate sensitivity

PL

zaprawa szybkowiążąca; włókno polietylenowe; odkształcenie; odporność na uderzenie

• Wydawca: Springer ; Wrocław University of Science and Technology
• Czasopismo: Archives of Civil and Mechanical Engineering
• Rocznik: 2021
• Tom: Vol. 21, no. 2
• Strony: 576--592
• Opis fizyczny: Bibliogr. 62 poz., fot., rys., wykr.

Twórcy

autor

Chun Booki

• Department of Architectural Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Republic of Korea

autor

Shin Wonsik

• Department of Architectural Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Republic of Korea

autor

Oh Taekgeun

• Department of Architectural Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Republic of Korea

autor

Yoo Doo-Yeol

• Department of Architectural Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Republic of Korea

• https://orcid.org/0000-0003-2814-5482

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