scholarly journals Comparación entre redes de fibras sintéticas y redes de fibras de cáñamo para el refuerzo de muros de albañileria = Comparison between synthetic fiber networks and hemp fiber networks for the reinforcement of masonry walls

2016 ◽  
Vol 2 (3) ◽  
pp. 26
Author(s):  
Alessandra Vilardi
Keyword(s):  
Natural Fibers ◽  
Synthetic Fiber ◽  
Masonry Walls ◽  
Historic Buildings ◽  
Structural Elements ◽  
Hemp Fiber ◽  
Hemp Fibers ◽  
Fiber Networks ◽  
Synthetic Fibers ◽  
Bidirectional Networks

ResumenLa existencia de una gran cantidad de edificios antiguos ha movilizado la investigación para estudiar nuevos sistemas de refuerzo a aquellas construcciones que sean dañadas por decadencia fisiológica o por terremoto. El presente documento demuestra la eficacia de un sistema de refuerzo innovador para los muros de mampostería, constituyentes los elementos estructurales de los edificios históricos. Se hace una comparación entre unas redes bidireccionales de fibras sintéticas tradicionales y las de fibras naturales, ambas pegadas a las dos fachadas del muro con matriz de mortero. El resultado muestra la aplicación de las fibras de cáñamo como refuerzo sísmico y una mayor compatibilidad de estas con el material que caracterizan los edificios antiguos. AbstractThe existence of a large number of old buildings has mobilized research to study new systems of reinforcement to those buildings that are damaged by physiological decay or earthquake. This document demonstrates the effectiveness of an innovative reinforcement system for masonry walls, which are the structural elements of historic buildings. A comparison is made between bidirectional networks of traditional synthetic fibers and those of natural fibers, both glued to the two facades of the wall with mortar matrix. The result shows the application of hemp fibers as seismic reinforcement and a greater compatibility of these with the material that characterize the old buildings.

Valorization of Vegetal Fibers in Anti-Fissuration Screed Mortar Formulation

2022 ◽  
Author(s):  
Sergio Pons Ribera ◽  
Rabah Hamzaoui ◽  
Johan Colin ◽  
Benitha Vasseur ◽  
Laetitia Bessette ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Mechanical Strength ◽  
Natural Fiber ◽  
Natural Fibers ◽  
Point Of View ◽  
Synthetic Fiber ◽  
Sem Images ◽  
Hemp Fibers ◽  
Synthetic Fibers ◽  
Rigid Fibers

This work, which is part of the FIBRABETON project, aims to anti-fissuration screed formulations proposition based on natural fibers and comparing these formulations to a synthetic fiber-screed formulation. Different natural fiber (hemp, flax, miscanthus and bamboo) with contents rangingfrom 0.4% to 0.8% were tested. The spread (slump), the shrinkage and mechanical strength (flexural and compressive) studies were carried out. SEM images of natural fibers and natural fibers screed formulation were analyzed. Overall, it is found that all natural fibers screed formulations tested, have shown better behaviour than the synthetic fibers screed formulation in point of view workability, shrinkage and mechanical properties. The lowest shrinkage value is found in the case of the H5 (5 mm long hemp fibers) screed formulation. Generally speaking, the mechanical strength values (flexural and compressive) are more or less similar between natural soft fibers (hemp and flax) and rigid fibers (miscanthus and bamboo). Taking in account slump, shrinkage and mechanical behavior, the proposed good compromise in this work is the H5 screed formulation.

Investigation of the Mechanical Behavior of Natural Vegetable Fibers Used in Composite Materials for Structural Strengthening

2021 ◽  
Vol 888 ◽  
pp. 15-21
Author(s):  
Ivelina Ivanova ◽  
Jules Assih ◽  
Dimitar Dontchev
Keyword(s):  
Mechanical Properties ◽  
Composite Materials ◽  
Fiber Composite ◽  
Low Cost ◽  
Weight Ratio ◽  
Synthetic Fiber ◽  
Engineering Structures ◽  
Hemp Fiber ◽  
Plant Fibers ◽  
Hemp Fibers

This research aims at studying the mechanical properties of industrial hemp fibers and promoting their use as a reinforcing composite material for strengthening of civil engineering structures. Natural hemp fibers are of great interest due to the following advantages they have: low cost, high strength-to-weight ratio, low density and non-corrosive properties. The use of plant fiber composite materials has increased significantly in recent years because of the negative reduction impact on the environment. For example, the tendency to use renewable resources and their possibility for recycling. They cause fewer health and environmental problems than synthetic fibers. Natural fibers, in addition to environmental aspects, have advantages such as low densities, i.e. have low weight, interesting mechanical properties comparable to those of synthetic fiber materials, and last but not least, low cost. Composites based on natural plant fibers can be used to reinforce or repair reinforced concrete structures, as shown by research on flax fiber composites. These concretes specimens strengthened with biocomposite materials have very good resistance to bending and significantly increase the rigidity of the structure. The results show that the hemp fiber reinforcement has significant effects on the strengthening and increase in flexural strength from 8% to 35 %.

Influence of Montmorillonite Treated with Cetyl Trimethyl Ammonium Bromide Addition in Epoxy-Kenaf Composites

2015 ◽  
Vol 754-755 ◽  
pp. 235-239
Author(s):  
A. Zuliahani ◽  
H.D. Rozman ◽  
Abdul Rahman Rozyanty
Keyword(s):  
Cetyl Trimethyl Ammonium Bromide ◽  
Natural Fiber ◽  
Environmental Concern ◽  
Low Cost ◽  
Natural Fibers ◽  
Synthetic Fiber ◽  
Ammonium Bromide ◽  
Synthetic Fibers ◽  
Cetyl Trimethyl Ammonium ◽  
Kenaf Composites

The use of natural fiber as reinforcement in polymer composites has gained importance recently due to environmental concern and its abundance availability from agricultural crops and wood industry [1]. Many advantages offered by natural fibers over synthetic fibers include low density, greater deformability, low cost per unit volume, recyclability and biodegradability [2-3]. In addition, the mechanical properties of natural fibers such as flax, hemp, jute, sisal and kenaf are comparable with glass fiber in respect of strength and modulus [4]. Hence, many studies have been carried out to replace the synthetic fiber for composite preparation.

Preparation and Mechanical Characterization of Jute-PP and Coir-PP Bio-Composites

2015 ◽  
Vol 766-767 ◽  
pp. 122-132
Author(s):  
Tippusultan ◽  
V.N. Gaitonde
Keyword(s):  
Mechanical Properties ◽  
Research Work ◽  
Natural Fibers ◽  
Weight Ratio ◽  
Synthetic Fiber ◽  
Synthetic Fibers ◽  
Fiber Loading ◽  
High Initial Cost ◽  
Full Factorial

Polymers reinforced with synthetic fibers such as glass and carbon offer advantages of high stiffness and strength to weight ratio compared to conventional materials. Despite these advantages, the prevalent use of synthetic fiber-reinforced polymer composite has a tendency to demur because of high initial cost and most importantly their adverse environmental impact. On the contrary, the increased interest in using natural fibers as reinforcement in plastics to substitute conventional synthetic fibers in automobile applications has become one of the main concerns to study the potential of using natural fibers as reinforcement for polymers. In this regard, an investigative study has been carried out to make potential utilization of natural fibers such as Jute and Coir as reinforcements, which are cheap and abundantly available in India. The objective of the present research work is to study the effects of fiber loading and particle size; fiber loading and fiber length on the mechanical properties of Jute-PP and Coir-PP bio-composites respectively. The experiments were planned as per full factorial design (FFD) and response surface methodology (RSM) based second order mathematical models of mechanical properties have been developed. Analysis of variance (ANOVA) has been employed to check the adequacy of the developed models. From the parametric analysis, it is revealed that Jute-PP bio-composites exhibit better mechanical properties when compared to Coir-PP bio-composites.

scholarly journals Characterization of a New Fiber From Cyperus Dichrostachus A.Rich Plant

2021 ◽  
Author(s):  
BELETE BAYE GELAW(Lecturer) ◽  
Tamrate Tesfaye(D.r)
Keyword(s):  
Energy Requirement ◽  
Natural Fibers ◽  
Vital Role ◽  
Synthetic Fiber ◽  
Cellulose Content ◽  
Competitive Advantages ◽  
Synthetic Fibers ◽  
Renewable Biomass ◽  
Potential Benefits

Abstract Natural fibers are of the good substitute sources for swapping synthetic fibers and reinforcing polymer matrices because of their contributions in maintaining of ecology, low energy requirement for processing and sustainability. The aim of this study is to characterize new fiber from Cyperus Dichrostachus A.Rich (CDA) plant. The CDA plant is a perennial non woody grass found in Ethiopian high lands and river basins. The fiber from this plant has good chemical composition of Cellulose (60.27%), hemicellulose (22.72%), lignin (16.59%) contents. It is light fiber having a density of 1010kg/m3 and good tenacity behaviour of 105.76cN/Tex with low elongation of 4.88%. The thermal stability of Cyperus Dicrostachys A,Rich fiber (CDAF) was studied using TGA and DTG analysis and revealed that the cellulose degraded at a temperature of 377.1°C. Fourier transform-infrared spectroscopy analysis confirmed that CDAF is rich in cellulose content. Furthermore, the properties of CDAF ensured that it can play a vital role as new reinforcement material and best alternative in bio composite industries. This will give competitive advantages when evaluated with other natural fibers reveals that there are significant potential benefits in implementation of “cleaner production” in textile material production industries. Specifically, replacement of synthetic fiber source with renewable biomass will reduce the environmental impact of these fibers. The future study will entail on investigating the possible valorization route especially in paper board, composite reinforcement and bio composite applications.

scholarly journals Tucum Fiber from Amazon Astrocaryum vulgare Palm Tree: Novel Reinforcement for Polymer Composites

Polymers ◽  
2020 ◽  
Vol 12 (10) ◽  
pp. 2259
Author(s):  
Michelle Souza Oliveira ◽  
Fernanda Santos da Luz ◽  
Andressa Teixeira Souza ◽  
Luana Cristyne da Cruz Demosthenes ◽  
Artur Camposo Pereira ◽  
...  
Keyword(s):  
Polymer Composites ◽  
Impact Energy ◽  
Natural Fibers ◽  
Critical Length ◽  
Epoxy Composites ◽  
Synthetic Fiber ◽  
Palm Tree ◽  
Ballistic Performance ◽  
Synthetic Fibers ◽  
Izod Impact

The replacement of synthetic fibers by natural fibers has, in recent decades, been the subject of intense research, particularly as reinforcement of composites. In this work, the lesser known tucum fiber, extracted from the leaves of the Amazon Astrocaryum vulgare palm tree, is investigated as a possible novel reinforcement of epoxy composites. The tucum fiber was characterized by pullout test for interfacial adhesion with epoxy matrix. The fiber presented a critical length of 6.30 mm, with interfacial shear strength of 2.73 MPa. Composites prepared with different volume fractions of 20 and 40% tucum fiber were characterized by tensile and Izod impact tests, as well as by ballistic impact energy absorption using .22 ammunition. A cost analysis compared the tucum fiber epoxy composites with other natural and synthetic fiber reinforced epoxy composites. The results showed that 40 vol% tucum fiber epoxy composites increased the tensile strength by 104% and the absorbed Izod impact energy by 157% in comparison to the plain epoxy, while the ballistic performance of the 20 vol% tucum fiber composites increased 150%. These results confirmed for the first time a reinforcement effect of the tucum fiber to polymer composites. Moreover, these composites exhibit superior cost effectiveness, taking into account a comparison made with others epoxy polymer composites.

Applications of Bio-Composites in Industrial Products

2001 ◽  
Vol 702 ◽  
Author(s):  
Prabhu Kandachar ◽  
Rik Brouwer
Keyword(s):  
Biodegradable Polymers ◽  
Moisture Absorption ◽  
Natural Fiber ◽  
Natural Fibers ◽  
Fiber Composites ◽  
Point Of View ◽  
Synthetic Fiber ◽  
Attractive Alternative ◽  
Natural Fiber Composites ◽  
Synthetic Fibers

ABSTRACTAvailable as agricultural resources in many countries, natural fibers, such as flax, hemp, kenaf, exhibit mechanical properties comparable to those of synthetic fibers like glass. But they are lighter, biodegradable, and are often claimed to be less expensive. Composites with these natural fibers have the potential to be attractive alternative to synthetic fiber composites. The natural fibers, however, exhibit more scatter in their properties, are thermally less stable and are sensitive to moisture absorption. The choice of matrix to reinforce with these fibers therefore becomes critical.Currently, synthetic non-biodegradable polymers, such as polypropylene, polyester, etc., are being explored as matrix materials, for applications in sectors like automobiles and buildings. Biodegradable polymers, if made available in sufficient quantities at affordable prices, pave way for bio-composites in future. With both matrix and fibers being biodegradable, bio-composites become attractive candidates from the environment point of view.Extensive and reliable property data on natural fiber composites and/or on bio-composites, are still lacking, making product design with these materials rather tedious. Once the database is available, design & manufacture of products with natural fiber composites and biocomposites offer several opportunities and challenges.

Effect of Fiber Treatment on Fiber Strength and Fiber/Matrix Interface of Hemp Reinforced Polypropylene Composites

2010 ◽  
Vol 112 ◽  
pp. 1-8 ◽  
Author(s):  
Sofien Bouzouita ◽  
Michelle Salvia ◽  
Hachmi Ben Daly ◽  
A. Dogui ◽  
E. Forest
Keyword(s):  
Load Transfer ◽  
Fiber Strength ◽  
Natural Fibers ◽  
Interfacial Properties ◽  
Impregnation Method ◽  
Interface Properties ◽  
Matrix Interface ◽  
Hemp Fiber ◽  
Hemp Fibers ◽  
Fiber Matrix

The use of natural fibers as reinforcement in composites is emerging. Several studies are underway to improve the mechanical characteristics of these fibers and its matrix interface properties for better load transfer. However, the treatments generally used are relatively expensive and complicated to apply. This work deals with the effect of new Fibroline process on tensile and interfacial properties of hemp fiber reinforced in polypropylene. Fibroline is a dry powder impregnation method which consists of submitting fibers and polymer powder under strong alternating electric field. Morphology and tensile properties of hemp fibers after different surface treatments (raw, dried, raw and Fibroline-treated, dried and Fibroline-treated) are evaluated. Interface properties of treated hemp fibers on polypropylene matrix are then characterized by fragmentation test of monofilament composites. Results showed the Fibroline treatment reduces the fiber mechanical properties but improves the load transfer efficiency due to random generation of surface cracks and better fiber/matrix adherence, respectively. For the case of dried and Fibroline-treated hemp fibers, large decrease in mechanical and interfacial properties was observed.

scholarly journals Multi-Leaf Masonry Walls with Full, Damaged and Consolidated Infill: Experimental and Numerical Analyses

2017 ◽  
Vol 747 ◽  
pp. 488-495 ◽  
Author(s):  
Ivano Aldreghetti ◽  
Daniele Baraldi ◽  
Giosuè Boscato ◽  
Antonella Cecchi ◽  
Lorenzo Massaria ◽  
...  
Keyword(s):  
Finite Element ◽  
Comparative Analysis ◽  
Structural Complexity ◽  
Experimental Tests ◽  
Masonry Wall ◽  
Research Community ◽  
Masonry Walls ◽  
Historic Buildings ◽  
Structural Elements ◽  
Historical Buildings

Multi-leaf masonry walls constitute the construction typology most widely adopted in historic buildings. This aspect, together with the intrinsic structural complexity, heterogeneity and irregularity, directs the present research towards a topic not yet sufficiently investigated by the research community of architects and civil engineers. In this paper, the case of multi-leaf masonry wall has been investigated, and with the aim of reproducing historical buildings structural elements, three different typologies of multi-leaf masonry walls have been considered: (i) full infill, (ii) damaged infill, (iii) consolidated infill. A comparative analysis has been performed and results of experimental tests have been compared with numerical ones obtained by means of Finite Element (FE) models.

scholarly journals Synthesis and Characterization of Polypropylene/Ramie Fiber with Hemp Fiber and Coir Fiber Natural Biopolymer Composite for Biomedical Application

2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
T. Sathish ◽  
Kumaran Palani ◽  
L. Natrayan ◽  
Anjibabu Merneedi ◽  
Melvin Victor De Poures ◽  
...  
Keyword(s):  
Biomedical Application ◽  
Research Work ◽  
Natural Fibers ◽  
Ramie Fiber ◽  
Coir Fiber ◽  
Compression Moulding ◽  
Hemp Fiber ◽  
Volume Percentage ◽  
Hemp Fibers ◽  
The Individual

In the current scenario, many natural fibers available in the world can be used in various applications in the day-to-day life of biomedical products, automobile parts, industrial products, etc. Biocomposites can replace or serve as a framework allowing the regeneration of traumatized, degenerated tissues, and organs, thus, improving the patients’ quality of life. This research work is aimed at fabricating and investigating the natural biopolymer composites for biomedical applications. There are two sets of fiber composites fabricated in this research work. Ramie fiber considers a common base fiber for both composites. Hemp fibers and coir fibers were considered as filler in this research work. Biodegradable and bioresorbable polypropylene resins are used to fabricate the biocomposite using the compression moulding technique. Different proportion specimen mechanical properties were compared for bone fixtures and joint applications. The contour plots and bar charts were plotted to identify the variations in the volume percentage. The individual fiber specimens also have significant properties when compared with the composite fibers. Then, the individual superior property-based combinations such as hemp and coir fiber mixed with biodegradable and bioresorbable polypropylene/ramie fiber were recommended to produce joints and bone fixtures to alleviate pain for patients.

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