Effect of recycled fibers made of polyethylene terephthalate (PET) on the mechanical properties of concrete

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SHAFABAKHSH GH.; Kobari Ghotbi a.; AHMADI M.

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Journal: Modares Civil Engineering journal Year:2018 | Volume:18 | Issue:1 Page(s): 123-132

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Information Journal Paper

Title

Effect of recycled fibers made of polyethylene terephthalate (PET) on the mechanical properties of concrete

Author(s)

SHAFABAKHSH GH. | Kobari Ghotbi a. | AHMADI M. | Issue Writer Certificate

Keywords

plastic bottlesQ1

polyethylene terephthalaQ1

fiberQ2

concreteQ2

mechanical propertiesQ2

Abstract

Disposal of Waste materials is a major challenge in each country and the use of plastics materials is increasing every day. A large part of the plastic wastes are bottles of drinks which are made of polyethylene terephthalate (PET). The reuse of plastic wastes plays an important role in sustainable solid waste management. Plastic waste management helps to save natural resources that cannot be replenished, decreases pollution of the environment and also helps to save and recycle energy production processes. Now a days, PET has been widely used to produce fibers, particles, or lakes to obtain cement-based products with improved properties. One transcendental alternative to recycling PETmaterials consists of using them as substitute of concrete aggregates. Due to demands of technological development in the construction area, the possibility for generating alternative materials that can be applied with increasing functionality, low costs, and better physical, chemical, and mechanical properties than conventional materials is being explored. fiber-reinforced concrete is a composite material resulting from the addition of reinforcing fibers to the brittle matrix of ordinary concrete. The ability to enhance flexural and tensile performance of the concrete matrix, together with the opportunity for improving its durability, pushed boundaries in developing new materials tobe used as fibres. Several studies using reinforced concrete with polymer fibers like polypropylene, polystyrene, polyethylene terephthalate, and polyethylene have evidenced variation of concrete properties according to the nature and size of the aggregate. The level of fibre performance depends strongly on the quality and amount of the employed fibres applied, on their shape and dimensions as well as on their bond to the concrete matrix. The ability to enhance flexural and tensile performance ofthe concrete matrix, together with the opportunity for improving its durability, pushed boundaries in developing new materials tobe used as fibres. Use of PET fibers in concrete will solve environmental problem of this waste material in addition to improvement of mechanical properties of concrete. Research on the use of PET fibres as dispersed reinforcement in concrete and mortars has been ongoing for about a decade withsporadic studies. In this research physical and mechanical behavior of concrete containing recycled PET fiber has been studies. For this purpose 10 concrete mixture, including 1control mixture and 9 pet fiber concrete mixtures were made. fibers in volume percentage of 0. 15%, 0. 30% and 0. 45% with the length of 1, 2 and 3 cm were used separately. The Compressive strength, tensile strength and flexural strength tests were done on the samples. fibers deformed with deforming machine to improve the adhesion of fiber with concrete. Compressive strengthwere performed ater7 and 28 days. The results show that PET fibers led to the increment of 5% to 18% in compressive strength compared to the control specimen. Unlike the compressive strength, PET fibers had no significant effect on the concrete tensile strength. Based on the results, in low volume percent of fiber (0. 15% volume percent), a slight increase was generated in the tensile strength while in greater volume percent it had negligible effect and even some reduction in tensile strength.

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