scholarly journals Comparison of the Mechanical Behavior of Concrete Containing Recycled CFRP Fibers and Polypropylene Fibers

2021 ◽  
Vol 11 (21) ◽  
pp. 10226
Author(s):  
María Isabel Prieto ◽  
María de las Nieves González ◽  
Alfonso Cobo ◽  
David Alonso
Keyword(s):  
Structural Material ◽  
Mechanical Behavior ◽  
Epoxy Resin ◽  
Carbon Fibers ◽  
Raw Materials ◽  
Polypropylene Fibers ◽  
Impact Tests ◽  
Recycled Fibers

The incorporation of natural or recycled fibers in concrete represents a field for improvement in this structural material and a step towards sustainability. The objective of this research is to determine whether the addition of recycled carbon fibers (CFRP), which have been hardened using epoxy resin, improves the behavior of concrete and whether its performance is comparable to that achieved by adding polypropylene fibers, which would result in a viable recycling alternative for this type of fiber. In order to explore this objective, 120 specimens were produced, on which compression, flexural, and impact tests were performed, and into which recycled CFRP fibers or polypropylene fibers were incorporated. By comparing the results obtained, it may be concluded that the addition of fibers substantially improves the ductility of the concrete and reduces the spalling effect when compared to concretes without added fibers. The concretes containing recycled CFRP fibers in quantities of 3 kg/m3 and 6 kg/m3 obtain better flexural and impact behaviors than concretes featuring the same amounts of polypropylene fibers, making this recycling alternative viable for CFRP fibers as well as reducing the amount of energy and raw materials that would be used to manufacture the fibers.

Bio-Based Epoxies and Composites for Technical Applications

2013 ◽  
Vol 559 ◽  
pp. 1-6 ◽  
Author(s):  
Andrzej K. Bledzki ◽  
Magdalena Urbaniak ◽  
Axel Boettcher ◽  
Christian Berger ◽  
Ryszard Pilawka
Keyword(s):  
Mechanical Behavior ◽  
Epoxy Resin ◽  
Charpy Impact ◽  
Fiber Reinforced ◽  
Plant Oil ◽  
Impact Tests

This paper focuses on the thermal and mechanical behavior of fiber-reinforced bio-epoxy materials in which the bio-content has been varied from 0 up to 100 %. Assorted formulations based on standard epoxy resin and epoxidized plant oil with varying bio-hardeners in differing matrix formulations, filler contents and fibers were used. DSC, TGA, DMA and HDT tests were carried out, as well as tensile and Charpy impact tests. The results show possible technical applications for bio-based epoxy materials.

scholarly journals Preparation and Characterization of Continuous Fe-Containing Silicon Carbide Radar Absorbing Fibers from Precursor-Based Processing

2012 ◽  
Vol 6 (1) ◽  
pp. 34-38
Author(s):  
Zhiyan Chen ◽  
Jun Wang ◽  
Xiaodong Li ◽  
Hao Wang
Keyword(s):  
Silicon Carbide ◽  
Structural Material ◽  
Epoxy Resin ◽  
Raw Materials ◽  
Nitrogen Atmosphere ◽  
Ceramic Fibers ◽  
Heat Treated ◽  
Melt Spun ◽  
Amorphous Sic

A new polymer polyferrocarbosilane (PFCS) was synthesized using polydimethylsilane and ferrocene as the raw materials. The polymer was then melt-spun into continuous PFCS fibers, cured in air and heat-treated in a nitrogen atmosphere up to 1300􀀁, a kind of Fe-containing SiC fibers were finally obtained. The SiC(Fe) ceramic fibers were combined with epoxy resin and a structural material was prepared showing excellent radar absorbing properties. HRTEM, XRD and XPS were used to characterize the SiC(Fe) fibers. The results show that the fibers are composed of β-SiC, amorphous SiCxO4-x, free carbon and small amount of Fe3Si-like microcrystals. A carbon-enriched layer of about 120nm was formed on the surface of the fibers.

scholarly journals Altered Rheokinetic and Mechanical behavior of Anhydride Cured Epoxy Resin Due To Addition of Cellulose Nano-Crystals

2021 ◽  
pp. 100124
Author(s):  
Sangeeta Sankhla ◽  
Santoshi Mohanta ◽  
Karthika K Namboothiri ◽  
Raghu Raja Pandiyan Kuppusamy ◽  
Swati Neogi
Keyword(s):  
Mechanical Behavior ◽  
Epoxy Resin

Interface property of carbon fibers/epoxy resin composite improved by hydrogen peroxide in supercritical water

2009 ◽  
Vol 63 (17) ◽  
pp. 1531-1534 ◽  
Author(s):  
H. Guo ◽  
Y.D. Huang ◽  
L.H. Meng ◽  
L. Liu ◽  
D.P. Fan ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Epoxy Resin ◽  
Carbon Fibers ◽  
Supercritical Water ◽  
Resin Composite ◽  
Interface Property ◽  
Epoxy Resin Composite

scholarly journals Changes in Color and Dynamic Viscoelastic Properties of Epoxy Resin Composites by Surface Modification of Carbon Fibers

TANSO ◽  
1996 ◽  
Vol 1996 (173) ◽  
pp. 148-153
Author(s):  
Takao Yoshikawa ◽  
Akira Kojima ◽  
Sugio Otani ◽  
Eiichi Yasuda
Keyword(s):  
Surface Modification ◽  
Epoxy Resin ◽  
Carbon Fibers ◽  
Viscoelastic Properties ◽  
Resin Composites ◽  
Epoxy Resin Composites

scholarly journals Fibers Networks as a New Type of Core Material. Processing and Mechanical Properties

2009 ◽  
Vol 1188 ◽  
Author(s):  
Laurent Mezeix ◽  
Christophe Bouvet ◽  
Serge Crézé ◽  
Dominique Poquillon
Keyword(s):  
Epoxy Resin ◽  
Carbon Fibers ◽  
Sandwich Panels ◽  
Open Architecture ◽  
Core Material ◽  
Cross Linking ◽  
Damping Capacity ◽  
The Core ◽  
Water Accumulation ◽  
Core Materials

AbstractMany different sandwich panels are used for aeronautical applications. Open and closed cell structured foam, balsa wood or honeycomb are often used as core materials. When the core material contains closed cells, water accumulation into the cell has to be taken into account. This phenomenon occurs when in service conditions lead to operate in humidity atmosphere. Then, water vapor from air naturally condenses on cold surfaces when the sandwich panel temperature decreases. This water accumulation might increase significantly the weight of the core material. Core with a ventilated structure helps to prevent this phenomenon. Periodic cellular metal (PCM) has been motivated by potential multifunctional applications that exploit their open architecture as well as their apparent superior strength and stiffness: pyramidal, lattice, Kagome truss or woven. One of the drawbacks of these materials is the expensive cost of the manufacturing. Recently, a novel type of sandwich has been developed with bonded metallic fibers as core material. This material presents attractive combination of properties like high specific stiffness, good damping capacity and energy absorption. Metal fibers bonded with a polymeric adhesive or fabricated in a mat-like form consolidated by solid state sintering. Entangled cross-linked carbon fibers have been also studied for using as core material by Laurent Mezeix. In the present study, ventilated core materials are elaborated from networks fibers. The simplicity of elaboration is one of the main advantages of this material. Multifunctional properties are given by mixing different sorts of fibers, by example adding fibers with good electrical conduction to give electrical conductivity properties. In this study network fibers as core material are elaborated using carbon fibers, glass fibers and stainless steel fibers. In aeronautical skins of sandwich panels used are often carbon/epoxy prepreg, so epoxy resin was used to cross-link fibers. The core thickness was chosen at 30 mm and fibers length was chosen at 40 mm. Entanglement, separation of filaments and cross-linking are obtained in a specific blower room. Fibers are introduced in the blower room, compressed air is applied and in same time epoxy resin is sprayed. Indeed one of the sandwich core material properties required is low density, so yarns size need to be decreased by separating filaments. Network fibers are introduced in a specific mould and then are compressed. The density obtained before epoxy spaying is 150 kg/m3. Finally samples are polymerized at 80°C for 2 hours in a furnace under laboratory air. Compressive behavior is study to determinate the influence of fibers natures and the effect of cross-linking. Reproducibility is also checked.

Pitch-based carbon fibers: preparation and applications

2021 ◽  
Vol 19 (3) ◽  
pp. 159-169
Author(s):  
B. B. Kaidar ◽  
G.T. Smagulova ◽  
A.A. Imash ◽  
S. Zhaparkul ◽  
Z.A. Mansurov
Keyword(s):  
Composite Materials ◽  
Electrical Properties ◽  
Carbon Fibers ◽  
Storage Systems ◽  
Raw Materials ◽  
Coal Tar ◽  
Commercial Use ◽  
Mechanical And Electrical Properties ◽  
Reinforced Composite ◽  
The Cost

Attention to carbon fiber (CF) conditioned by their unique physicochemical, mechanical and electrical properties, which makes them in demand in various fields of activity. Today there are several kinds of carbon fibers, most of which (about 90%) are made of polyacrylonitrile (PAN). Despite the fact that carbon fibers are produced from several types of different precursors, their widespread commercial use is limited by the high cost of the product. Has, many research and engineering group seek to reduce the cost of production by using cheap carbon raw materials. A likely solution to this problem is the exploitation of coal, petroleum and coal tar as an effective progenitor for CF production. This review discusses neoteric accomplishment in CF synthesis using various carbon pitches. The possibility of obtaining carbon fibers based on resin with the addition of PAN is presented, and the prospects for their use in energy storage systems and various reinforced composite materials are described in detail.

Curing Properties of Matrix Epoxy Resin on Surface Modified Carbon Fibers

TANSO ◽  
1996 ◽  
Vol 1996 (173) ◽  
pp. 154-160
Author(s):  
Takao Yoshikawa ◽  
Saburo Endo ◽  
Akira Kojima ◽  
Sugio Otani ◽  
Eiichi Yasuda
Keyword(s):  
Epoxy Resin ◽  
Carbon Fibers ◽  
Surface Modified
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