Forming technology of polymer matrix composites

Fibers are used to improve the properties of concrete. This paper investigates the mechanical properties of chopped carbon fiber-reinforced concrete (CFRC). The properties examined include workability, compressive strength, splitting tensile strength, and flexural strength. The fibers were added at the volume fractions of 0.5, 1.0, 1.5, and 2.0 percent. Adding carbon fiber to the concrete decreased the workability of concrete. Compressive strength of CFRC increases with increasing fiber content up to a certain percentage, after which increasing fiber content becomes unbeneficial. This optimum fiber content is found to be 1 percent, with strength effectiveness of 13 .65 percent. The splitting tensile strength of CFRC improved linearly with increased fiber content, and the strength effectiveness ranged from 18.37 percent to 132.6 percent. The flexural strength of CFRC improved linearly with increasing fiber content, and the strength effectiveness ranged from 3.26 percent to 13.82 percent. Relationships for compressive strength, splitting tensile strength, and flexural strength of CFRC are introduced. AbstractThis study is investigating the properties of self-consolidating concrete (SCC) containing synthetic polymer fibers. The influence of hybrid synthetic fiber reinforcement on concrete properties is reported. A total of six mixtures on which five of them are reinforced with fiber content ratio of 1 % using several percent of macro and micro fibers. The concrete mixtures' density, filling ability, passing ability, segregation and compressive strength are determined. The test results showed that all mixtures with fiber have lower density, slump and J-Ring flow than unreinforced concrete. The less the macro fiber percent in the mixture, the higher the slump flow.all mixtures are classified as resistant for static segregation resistance. SCC compressive strength decreased drastically with adding fibers linearly. homopolymer polypropylene fibers in a collated fibrillated form will give smaller flow slump, smaller compressive strength, but larger penetration depth than mixtures with homopolymer polypropylene monofilament fibers.

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“…• Relationships for compressive strength, splitting tensile strength, and flexural strength of FRC are introduced. 43.00…”

Section: Discussionmentioning

confidence: 99%

“…7.). Composites with strong interface bond have a high strength and stiffness which attributes to a difficulty to pull out fiber from the matrix at cracks locations [ 43]. Fibers will act as a reinforcement and bridge microcracks and prevents the expansion.…”

Section: Flexural Strengthmentioning

confidence: 99%

Mechanical Properties of Carbon-Fiber–Reinforced Concrete

Ghanem

Bowling

2019

Adv. Civ. Eng. Matls.

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“…Diluents are additives that have traditionally been used to control viscosity for easier processing, without major changes to the behavior of the cured ER system [27,28]. Non-reactive diluents include solvents like toluene, acetone, phenols among others, which cannot react with and therefore bond to the forming network, and are assumed to have negligible influence on the final properties of the ER [26,29]. Due to the low boiling and flash points of such non-reactive diluents, they are assumed to leave the polymer matrix during degassing and curing, even though work has been published that showed some potential effects of diluents on properties of ER based composites, but without giving explanation of the potential causes of said effects [30].…”

Section: X23 Dielectric Responsementioning

confidence: 99%

Dielectric Properties of Epoxy/POSS and PE/POSS Systems

David

Andritsch

2018

Polymer/Poss Nanocomposites and Hybrid Materials

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In many applications in electronic, power and high voltage engineering, there is a need to improve the electrical properties of existing insulation systems and/or to develop novel insulation materials with properties more suitable with the changing requirements, particularly in the electrotechnical area. During the last few decades, a considerable attention has been given to the possible use of polymeric nanocomposites systems, usually a non-conductive polymer containing nanometric inorganic fillers, as a replacement to the neat polymers offering better electrical and thermal properties. There is almost nowadays a consensus among the scientific community that such property enhancements can only be achieved when the nano-fillers present a reasonably good size dispersion and spatial distribution within the host polymer. However, due to nano-fillers' strong tendency to agglomerate and their generally poor compatibility with commonly-used polymers, to reach optimal dispersions has been found challenging in most cases. In order to improve the polymer/particles compatibility and therefore to avoid agglomeration and poor dispersion problems, polyhedral oligomeric silsesquioxanes (POSS) appears to be a filler of choice since they are by nature nanoscaled molecules bearing built-in functionalities which can be selected according to the chemical nature of the host polymer. This chapter summarizes the investigations that were reported so far on the electrical properties of epoxy/POSS, PE/POSS and PP/POSS systems. The general conclusion is that in the case of polyolefin/POSS composites, nanoscale dispersion was found to be hard to reach despite the selection alkyl-type POSS and the dielectric properties were not found to be strongly improved while in the case of epoxy/POSS systems, the selection of appropriate POSS compounds and a carefully chosen resin/additive/hardener ratio allow nanoscale dispersion accompanied with noticeable improvements of the dielectric properties.

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“…When exposed to moisture, water acts a plasticizer, lowering the glass transition temperature of polymers [25]. Coupled with an increase in temperature, the matrix might have reached its glass transition temperature.…”

Section: Effect Of Temperaturementioning

confidence: 99%

Effect of Particle Loading, Temperature and Surface Treatment on Moisture Absorption of CFB Fly Ash Reinforced Thermoset Composite

Onishi¹

2015

IJCEA

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Abstract-Coal combustion is widely used in the Philippines and is a major contributor to power generation due to its low cost; however, it produces wastes such as emissions and fly ash (FA). Traditional fuel combustion uses pulverized coal (PC) boilers while modern technology involves the use of circulated fluidized bed (CFB) boilers which produce less emissions and are more efficient. However, the fly ash produced from CFB combustion has limited application to the construction industry as opposed to PC FA which is used as an additive to the cement industry. In this study, CFB FA is used as filler and the matrix is orthophthalic unsaturated polyester resin. Moisture absorption study is conducted on the composite by immersing in water and constant weighing of samples at specified time intervals. Percent weight gain is reported. Particle loading and sorption temperatures are varied and their effects are observed. With the increase in particle loading, absorbed moisture increases while diffusivity decreases. Increase in temperature leads to an increase in moisture absorption and diffusivity. The CFB FA is also treated using coconut oil which is composed of saturated fatty acids (majority of which is lauric oil). Coconut oil serves as a non-coupling type surface modifier. Untreated and treated fly ash samples are characterized by X-Ray Flourescence (XRF), Scanning Electron Microscopy (SEM) and Fourier Transform Infrared Spectroscopy (FTIR). The effect of treatment to composite moisture absorption at 80oC (different particle loading) is observed and it is found to decrease moisture absorption.Index Terms-CFB fly ash, moisture absorption, particle filled composite, polyester composite. I. INTRODUCTIONCombustion of solid fuels is one of the most widely used source of energy. Worldwide, coal is a sought-after energy source. It is often the cheapest fuel option and has a large reserve. Philippines is a coal consuming country, having coal as one of the major contributors to power generation [1]. Energy consumption and generation in the Philippines is increasing and with this power generation from coal will also increase. This will continue to increase as the government promotes clean coal technology, production of coal and establishment of ASEAN Coal Supply Security Agreement. The increase in production of coal is targeted to displace and decrease oil use [2].With environmental awareness and restrictions, cleaner and more efficient burning of fuel is now available thru the Manuscript received April 15, 2014; revised June 25, 2014. This work was supported by the Philippine Department of Science and TechnologyEngineering and Research Development for Technology.Sakura E. Onishi is with the University of the Philippines-Diliman, Philippine (e-mail: sakura.onishi@gmail.com).clean coal technology, wherein circulating fluidized bed (CFB) are used. Circulating fluidized bed combustion (CFBC) boiler can utilise all grades of coal and lignites in an efficient and environmentally clean way (lower emissions) [3].Combustion of solid f...

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Forming technology of polymer matrix composites

Cited by 43 publications

References 2 publications

Mechanical Properties of Carbon-Fiber–Reinforced Concrete

Mechanical Properties of Carbon-Fiber–Reinforced Concrete

Dielectric Properties of Epoxy/POSS and PE/POSS Systems

Effect of Particle Loading, Temperature and Surface Treatment on Moisture Absorption of CFB Fly Ash Reinforced Thermoset Composite

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