Study of epoxy composites and sisal fibers as reinforcement of reinforced concrete structure

Abstract

The application of structural reinforcement has presented a significant growth in the present days. The development of new materials for this purpose has aroused the interest of many researchers. The present work aim evaluate the production and application of polymers reinforced with vegetable fibers (PRFVeg) for reinforcement of reinforced concrete structures. An experimental program was developed using composites with 50%, 60% and 70% fibers volume content. The composites’s tensile mechanical properties were evaluated in order to choose the fiber content with better mechanical performance. Epoxy matrix and sisal fibers were adopted in the production of PRFVeg. The reinforcement design was performed by numerical simulation using the finite element method. The reinforced beams were submitted to a 3-point flexural test until rupture and the performance of the material produced was compared to carbon fiber reinforced epoxy (PRFC) composites commonly used as reinforcement of reinforced concrete structures. The results obtained showed that the PRFVeg present similar performance compared to composites reinforced with carbon fibers, obtaining a load increase of up to 62% compared to the beams without polymer reinforcement.

Thermal behavior evaluation of benzoxazine reinforced withmacadamiabiomass composites

“…Francklin et al (2019) studied epoxy composites reinforced with sisal fibers and used as reinforced concrete structures. The authors observed results, in bending tests, similar to those found in composites with carbon fibers, obtaining an increase in load of up to 62% in relation to beams without reinforcement 32 . Biswas (2019) studied epoxy, bamboo (45% w/w) and silicon carbide (SiC) (0, 5, 10, and 15 w/w) composites as a sustainable and renewable resource for the development of ecological compounds which have attractive properties such as improvement in hardness (from 46 to 57 Hv) obtained in samples with 15% SiC, in tensile strength in bodies with 10% in weight of SiC (10.48 to 13.44 MPa), in flexural strength (from 19.93 to 29.53 MPa) at 5% by weight of SiC 33…”

“…Among the most recent studies, we can mention the work of Oliveira et al (2020) who studies the properties of the benzoxazine composite reinforced with Manicaria saccifera and Lafit et al (2019) who conducts a comprehensive study on surface treatments of natural fibers for anchoring, in composites, the benzoxazine matrix. However, no literature consulted describes the study involving benzoxazine resins reinforced with macadamia biomass 6,7,30–36 …”

Mechanical spectroscopy to determine the torsion modulus from hollow glass microspheres fillers in unsaturated polyester resin

“…In the case of composites, they can meet these new requirements. 1,2 This type of material has shown astonishing growth, conquering a wide market range, used in various applications, in aerospace, 3,4 automotive, 5,6 naval, 7 civil, 8,9 electrical, 10 and biomedical. 11 In order to predict the behavior of materials when subjected to stresses or loads, it is necessary to know their characteristics, such as rigidity.…”

“…It represents an essential property in materials that could potentially use as a possible choice for implants [11][12][13][14][15] or in structures subjected to torsion or traction (compression). 1,2,8,16,17 The elastic modulus, reporting to metals and their alloys depends on the atomic bonds and the distances between the atoms in the crystalline lattice. Therefore, it is sensitive to the addition of elements, thermomechanical treatments, and deformation processing.…”

Torsion modulus with CaCO3 fillers in unsaturated polyester resin - mechanical spectroscopy

“…Therefore, the elastic modulus, which measures a material's rigidity, must always be considered. It represents an essential property in the behavior of materials used in various applications such as aerospace [1,2] , automotive [3] , naval [4] , civil [5] , electrical [6,7] , biomedical [8] , implants [9] , and structures [10][11][12] subjected to torsion and traction (compression). The elastic modulus, reported for metals and their alloys, depends on the atomic bonds and the distances between atoms in the crystalline lattice.…”