Experimental Behavior of Natural Fiber-Based Composites Used for Strengthening Masonry Structures

Codispoti, Rosamaria; Oliveira, Daniel V.; Fangueiro, Raúl; Lourenço, Paulo B.; Olivito, Renato Sante

doi:10.1155/2013/539856

Cited by 10 publications

(7 citation statements)

References 4 publications

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“…Composite samples were produced using one, two or three layers of flax and sisal fabric strips. Because of their good mechanical properties compared to those of other natural fibres, flax and sisal fibres have been used to produce composite materials with great potential for strengthening structures [4,11,14,22]. The matrix used was a limebased grouting (NLG) mix containing natural pozzolans and carbonated filler.…”

Section: Introductionmentioning

confidence: 99%

Effects of fabric parameters on the tensile behaviour of sustainable cementitious composites

Cevallos

Olivito

2015

Composites Part B: Engineering

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Section: Introductionmentioning

confidence: 99%

Effects of fabric parameters on the tensile behaviour of sustainable cementitious composites

Cevallos

Olivito

2015

Composites Part B: Engineering

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“…In fact, after the cracking, the stress-strain curve depends on the tension stiffening phenomena. In particular, the matrix cracks according to a non-uniform distribution [27,28]. The cracks develop in a finite number of sections and, where the matrix is cracked, the load is carried by the fibers only.…”

Section: Theoretical Approachmentioning

confidence: 99%

“…Conversely, if the matrix is characterized by more compatible properties with the fiber, the stress-strain curve shifts from the uncracked to the cracked condition progressively. According to the experimental results, the latter is typical of composite systems made of inorganic matrix and hemp fibers [27].…”

Section: Theoretical Approachmentioning

confidence: 99%

Numerical Investigation of Masonry Strengthened with Composites

et al. 2018

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In this work, two main fiber strengthening systems typically applied in masonry structures have been investigated: composites made of basalt and hemp fibers, coupled with inorganic matrix. Starting from the experimental results on composites, the out-of-plane behavior of the strengthened masonry was assessed according to several numerical analyses. In a first step, the ultimate behavior was assessed in terms of P (axial load)-M (bending moment) domain (i.e., failure surface), changing several mechanical parameters. In order to assess the ductility capacity of the strengthened masonry elements, the P-M domain was estimated starting from the bending moment-curvature diagrams. Key information about the impact of several mechanical parameters on both the capacity and the ductility was considered. Furthermore, the numerical analyses allow the assessment of the efficiency of the strengthening system, changing the main mechanical properties. Basalt fibers had lower efficiency when applied to weak masonry. In this case, the elastic properties of the masonry did not influence the structural behavior under a no tension assumption for the masonry. Conversely, their impact became non-negligible, especially for higher values of the compressive strength of the masonry. The stress-strain curve used to model the composite impacted the flexural strength. Natural fibers provided similar outcomes, but a first difference regards the higher mechanical compatibility of the strengthening system with the substrate. In this case, the ultimate condition is due to the failure mode of the composite. The stress-strain curves used to model the strengthening system are crucial in the ductility estimation of the strengthened masonry. However, the behavior of the composite strongly influences the curvature ductility in the case of higher compressive strength for masonry. The numerical results discussed in this paper provide the base to develop normalized capacity models able to provide important information on the out-of-plane behavior of masonry elements strengthened with inorganic matrix and several kinds of fibers, both synthetic and natural.

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“…By integrating relation (14) and considering the above boundary condition (15), the vertical deflection w 0 of the arbitrary cross section may be computed by using the formula:…”

Section: Beam Theorymentioning

confidence: 99%

“…13 Many applications of the composite materials reinforced with flax fibres refer to randomly reinforcing with chopped flax fibres, 1 to reinforcing with continuous flax fibres by using biaxial woven fabric 7 or to reinforcing with continuous unidirectional fibres. [12][13][14] Comparative analysis was made 14 regarding the results obtained in case of composite materials based on epoxy resin reinforced with natural fibres (flax, jute, sisal, hemp). The tensile modulus corresponding to the flax/epoxy composite was reported to be 152.49%, 102.35% and 182.35% 14 greater than that corresponding to the composite materials reinforced with jute, sisal and hemp fibres, respectively.…”

Section: Introductionmentioning

confidence: 99%

Practical solution for improving the mechanical behaviour of the composite materials reinforced with flax woven fabric

Cerbu

2015

Advances in Mechanical Engineering

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This article focuses on finding a practical solution for improving the mechanical behaviour especially in bending in case of the composite materials reinforced with flax fabric. For this purpose, two kinds of composites having the same number of layers are mechanically tested: the flax/epoxy composite and the flax/glass/epoxy composite (hybrid composite). The mechanical tests used were tensile test and bending test (three-point method). Different results corresponding to the weft or warp directions were remarked in case of the hybrid composite: for example, the maximum values of the tensile strength and the flexural strength measured in the weft direction are 40.63% and 34.61% greater, respectively, than the values corresponding to the warp direction. This article reports the improvement of the mechanical properties by replacing the flax reinforcement with glass reinforcement in the two upper and lower layers of the flax composite materials: increasing with 35.19% in terms of Young's modulus E recorded in the tensile test, with 79.86% of the maximum value of the tensile stress and with 91.08% of the maximum value of the flexural stress. Composite beam theory was considered and theoretical approaches were validated by the experimental results.

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Experimental Behavior of Natural Fiber-Based Composites Used for Strengthening Masonry Structures

Cited by 10 publications

References 4 publications

Effects of fabric parameters on the tensile behaviour of sustainable cementitious composites

Effects of fabric parameters on the tensile behaviour of sustainable cementitious composites

Numerical Investigation of Masonry Strengthened with Composites

Practical solution for improving the mechanical behaviour of the composite materials reinforced with flax woven fabric

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