Document Type : Original Article
Authors
1
Assistant Prof., Civil Engineering, Faculty of Engineering, Behbahan Khatam Alanbia University of Technolog, Behbahan, Iran.
2
Master's student in Civil-Structural Engineering, Faculty of Engineering, Behbahan Khatam Alanbia University of Technology, Behbahan, Iran.
10.22065/jsce.2024.428815.3293
Abstract
Self-compacting concrete is concrete that, due to its fluidity and fluidity, can fill all corners of the mold and rebars only under the influence of gravity and without the need for any mechanical pressure, without causing separation or shedding water, and it compacts automatically. Self-compacting concrete has been increasingly targeted by engineers and researchers in the construction industry. Plastic bottles are one of the major parts of solid waste. One of the plastic recycling materials that are prepared based on plastic bottles are recycled polyethylene terephthalate fibers. The main goal of this research is to use polyethylene terephthalate fibers in the self-compacting concrete mixing plan to increase the tensile strength and reduce the permeability of the samples. In this way, the fibers are cut with a length of 3 to 4 cm and used in self-compacting concrete with different percentages (0, 0.5, 1, 1.5, 2 percent compared to the weight of cement) as a cheap and accessible additive. became. Slump flow tests, V funnel, L box, J ring, compressive strength, tensile strength, ultrasonic pulse speed, Schmidt hammer and permeability tests were tested for the fresh and hardened properties of self-compacting concrete with fibers. The results of the experiments showed that with the increase in the percentage of polyethylene terephthalate fibers in self-compacting concrete, the tensile strength during 7 and 28 days of curing in the range of 14.35-58.35 and 21.9-72.57 percent increased compared to self-compacting concrete without fibers. The compressive strength was in the range of 3.02-12.64 and 3.97-12.88 percent of the strength reduction compared to self-compacting concrete without fibers, and also the permeability test in 72 hours was in the range of 8.13-47.67 percent of permeability compared to concrete The self-density without fibers decreased.
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