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Advances in Nano Research Volume 14, Number 4, April 2023 , pages 363-373 DOI: https://doi.org/10.12989/anr.2023.14.4.363 |
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Synergistic bond properties of new steel fibers with rounded-end from carbon nanotubes reinforced ultra-high performance concrete matrix |
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Nguyen Dinh Trung, Dinh Tran Ngoc Huy,
Dmitry Olegovich Bokov, Maria Jade Catalan Opulencia,
Fahad Alsaikhan, Irfan Ahmad and Guljakhan Karlibaeva
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| Abstract | ||
| A novel type of steel fiber with a rounded-end shape is presented to improve the bonding behavior of fibers with Carbon Nanotubes (CNT)-reinforced Ultra-High Performance Concrete (UHPC) matrix. For this purpose, by performing a parametric study and using the nonlinear finite element method, the impact of geometric characteristics of the fiber end on its bonding behavior with UHPC has been studied. The cohesive zone model investigates the interface between the fibers and the cement matrix. The mechanical properties of the cohesive zone model are determined by calibrating the finite element results and the experimental fiber pull-out test. Also, the results are evaluated with the straight steel fibers outcomes. Using the novel presented fibers, the bond strength has significantly improved compared to the straight steel fibers. The new proposed fibers increase bond strength by 1.1 times for the same diameter of fibers. By creating fillet at the contact area between the rounded end and the fiber, bond strength is significantly improved, the maximum fiber capacity is reachable, and the pull-out occurs in the form of fracture and tearing of the fibers, which is the most desirable bonding mode for fibers. This also improves the energy absorbed by the fibers and is 4.4 times more than the corresponding straight fibers. | ||
| Key Words | ||
| bond strength; CNT-reinforced; novel steel fibers; pull-out behavior; UHPC | ||
| Address | ||
| Nguyen Dinh Trung: National Economics University (NEU), Hanoi Vietnam Dinh Tran Ngoc Huy: Banking university HCMC Ho Chi Minh city Vietnam- International University of Japan, Niigata, Japan Dmitry Olegovich Bokov: Institute of Pharmacy, Sechenov First Moscow State Medical University, 8 Trubetskaya St., bldg. 2, Moscow, 119991, Russian Federation; Laboratory of Food Chemistry, Federal Research Center of Nutrition, Biotechnology and Food Safety, 2/14 Ustyinsky pr., Moscow, 109240, Russian Federation Maria Jade Catalan Opulencia: College of Business Administration, Ajman University, Ajman, United Arab Emirates Fahad Alsaikhan: Department of Clinical Pharmacy, College of Pharmacy, Prince Sattam Bin Abdulaziz University, Alkharj, Kingdom of Saudi Arabia Irfan Ahmad: Department of Clinical Laboratory Sciences, College of Applied Medical Sciences, King Khalid University, Abha, Saudi Arabia Guljakhan Karlibaeva: Department of Physics Teaching Methods, Tashkent State Pedagogical University named after Nizami, Bunyodkor street 27, Tashkent, Uzbekistan | ||