Prediction Model of Deflections in PET Fiber Reinforced Concrete Beams
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Prediction Model of Deflections in PET Fiber Reinforced Concrete Beams F. J. Baldenebro-Lopez1,2, J. H. Castorena-Gonzalez2,*, J. A. Baldenebro-Lopez2, J.I. VelazquezDimas3,J. E. Ledezma-Sillas1, R. Martinez-Sanchez1 and J. M. Herrera-Ramirez1 1 Centro de Investigación en Materiales Avanzados (CIMAV), Chihuahua, Chih., México 2 Facultad de Ingeniería Mochis, Universidad Autónoma de Sinaloa, Los Mochis, Sinaloa, México 3 Facultad de Ingeniería, Universidad Autónoma de Sinaloa, Culiacán, Sinaloa, México ABSTRACT The increasing use of polymeric reinforcements in concrete structures requires either the development of a new design theory or the adaptation of current designs considering the engineering properties of this type of materials. In this work a method for calculating the deflections of reinforced concrete elements is proposed, which can be used in predicting the flexural behavior of longitudinally reinforced concrete with PET strips in amounts up to 1%. The model theory assumes that concrete has a tensile load capacity different to zero, characterized by a uniaxial tensile stress-strain diagram. A series of tests were conducted to corroborate the validity of the suggested method, showing that the theory also correctly predicts the creep deformation post-cracking. The deflection results of reinforced concrete with recycled PET strips are presented. The tests are carried out by a simple beam with center-point loading, using three different amounts of reinforcement and comparing the experimental results with the theoretical results of the proposed model. INTRODUCTION Concrete is the most widely construction material used in the world due to its high compressive strength, durability and low cost. However, it has inherent disadvantages such as low tensile strength and cracking. Several studies about concrete reinforced with polymeric strips have been made with the aim of improving such deficiencies of the material. The reported results show that it is possible to improve the performance of concrete by reinforcing it with different plastic elements [1]. Reinforced concrete (RC) is a composite material that results from the addition of diverse elements to the brittle matrix of ordinary concrete. Several investigations have been done on the reinforcement of structural materials using plastic elements [2-7]. In the case of concrete, the main reinforcing materials are steel, glass and polymeric fibers. Some of these reinforcements are used in structures such as columns, beams and walls [8-10]. Recently the use of recycled materials as reinforcement in concrete elements has received increasing attention worldwide, being one of them polyethylene terephthalate (PET) obtained from recycled plastic bottles. PET has higher resistance to degradation, lower cost and density, and is also non-conductive of electricity and magnetism. Therefore, polymer reinforced concrete can be an excellent alternative for structures built in or near marine environments or similar corrosive environments (deicing salts), where electromagnetic neutra
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