evaluation of carbon fiber dispersion in cementbased

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Evaluation of carbon fiber dispersion in cement-based ...

Jan 10, 2021  Uniform dispersion of carbon fibers is key to improving the properties of carbon fiber reinforced cement-based composites (CFRC). For the sake of high reliability, several methods were applied to measure the dispersed state of carbon fibers in the matrix.

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Quantitative evaluation of carbon fiber dispersion in ...

Oct 15, 2014  This is a preliminary study on the quantitative evaluation about the degree of the carbon fiber dispersion in cement based composites. The properties of the composites with these carbon fiber dispersions, such as cracking, should be included in future studies to

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Evaluation of carbon fiber dispersion in cement-based ...

Evaluation of carbon fiber dispersion in cement-based materials using mechanical properties, conductivity, mass variation coefficient, and microstructure January 2021 Construction and Building ...

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Quantitative evaluation of carbon fiber dispersion in ...

Evaluation of carbon fiber dispersion in cement-based materials using mechanical properties, conductivity, mass variation coefficient, and microstructure Article Jan 2021

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Evaluation of fibers dispersion of cement-based sensors ...

The orientation of the carbon fibres in the 2-D thin section was studied precisely by measuring both the dip and bearing angles. This procedure was found to be useful in eliminating the errors in orientation measurements of the carbon fibres. REFERENCES [1] Azhari, F. and Banthia, N. (2012) Cement-Based Sensors with Carbon Fibers and

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Quantitative Evaluation of Carbon Fiber Dispersion in ...

Carbon fiber dispersion has a substantial influence on the properties of amorphous calcium silicate hydrate-based contact-hardening composites. In this study, a mixture of carbon fiber and calcium silicate hydrate powder was compressed into solid composites at 40 MPa for one minute. The mechanical properties and electrical resistivity of the solid materials were measured, and the dispersion of ...

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CVD Treatment of Carbon Fibers and Evaluation of Their ...

3. Evaluation Methods of Carbon Fiber Dispersion. 3.1. SE Method. Short carbon fibers were initially placed in a 200 mL glass beaker. 100 mL water was added to ensure that fibers were completely submerged in the water. The beaker was vibrated by ultrasonic wave for 30 min, during which the temperature of water keeps around 45˚C.

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BSE-based dispersion quantification of carbon fibres in ...

Nov 10, 2020  Micro-engineered cementitious composite requires a quantitative evaluation of the phase dispersion state. In the application of the carbon fibre enhanced cementitious composite, the excellent electrical conductivity of the fibre network has been utilized for

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Evaluation of carbon fiber reinforced cementitious matrix ...

Apr 20, 2019  In the research presented in this paper, a new cement-based material was developed introducing chopped carbon fiber. The carbon-fiber-reinforced cementitious matrix (C-FRCM) containing a cement-based matrix and embedded carbon-fiber mesh is an alternative solution to FRP-epoxy resin, addressing cost, durability, and reversibility issues.

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(PDF) CVD Treatment of Carbon Fibers and Evaluation of ...

It is shown that this inhomogeneity increases when weight percentage of carbon fibers increases [8,33]. Different studies have been conducted to optimize the dispersion of these long CFs [33][34 ...

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Quantitative evaluation of carbon fiber dispersion in ...

Evaluation of carbon fiber dispersion in cement-based materials using mechanical properties, conductivity, mass variation coefficient, and microstructure Article Jan 2021

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Evaluation of fibers dispersion of cement-based sensors ...

The orientation of the carbon fibres in the 2-D thin section was studied precisely by measuring both the dip and bearing angles. This procedure was found to be useful in eliminating the errors in orientation measurements of the carbon fibres. REFERENCES [1] Azhari, F. and Banthia, N. (2012) Cement-Based Sensors with Carbon Fibers and

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CVD Treatment of Carbon Fibers and Evaluation of Their ...

Carbon fiber dispersion, which is a common topic, and usually difficult to cope with [1] [2] [3] [12], greatly influences the properties of CFRC especially when carbon fibers were treated by CVD ...

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Carbon fiber reinforced cement mortar improved by using ...

Nov 01, 2001  Table 1, Table 2 show the tensile properties and electrical resistivity of mortars with and without silica fume, respectively. All mortars contained carbon fibers and the water/cement ratio was 0.35. The amount of water added to the mix containing a dispersion was less than 0.35 by mass of cement, due to the amount of water in the dispersion.

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Partial replacement of carbon fiber by carbon black in ...

Mar 01, 2007  The electrical resistivity of cement paste without conductive admixture is 6 × 10 5 Ω cm . Table 1 shows that both carbon fiber and carbon black are effective in decreasing the resistivity. However, as shown in Table 1, carbon fiber is more effective than carbon black at the same mass content (whether 0.5% or 1.0% by mass of cement) in lowering the resistivity and in enhancing the

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Improvement in the physical and mechanical properties of ...

Sep 29, 2021  Korayem, A. H. et al. Optimizing the degree of carbon nanotube dispersion in a solvent for producing reinforced epoxy matrices. Powder Technol. 284 ,

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Image Analysis and DC Conductivity Measurement for the ...

Dec 18, 2015  The present work proposes a new image analysis method for the evaluation of the multi-walled carbon nanotube (MWNT) distribution in a cement matrix. In this method, white cement was used instead of ordinary Portland cement with MWNT in an effort to differentiate MWNT from the cement matrix. In addition, MWNT-embedded cement composites were fabricated under different flows of

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Evaluation of steel fiber distribution in cement-based ...

Mar 10, 2016  The non-uniform distribution of steel fibers in fiber-reinforced cement-based mortars (FRCMs) can lead to heterogeneous properties of hardened material with direct impact on mechanical properties. Among various nondestructive testing techniques, the active microwave thermography (AMT) has shown good potential for inspection of cement-based materials. AMT utilizes combination of

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Functional Properties of a Pitch-Based Carbon Fiber–Mortar ...

This experimental study investigated the utility of a pitch-based carbon fiberndash;mortar composite, which could replace polyacrylonitrile carbon fiber, as a thin overlay for concrete pavement. The objective was to explore the utility of the low-cost carbon fiber, which was produced via a melt-blown method, i.e., blowing at high pressure after melting the pitch residue following crude oil ...

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Experimental Analysis of Mechanical Properties and ...

Sep 01, 2021  Cement-based composite is a kind of composite material based on Portland cement, which is composed of alkali resistant glass fiber, general synthetic fiber, various ceramic fiber, carbon and aramid fiber, metal wire, natural plant fiber and mineral fiber as reinforcement, adding fillers, chemical additives, and water through composite process.

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MWCNT/rGO/natural rubber latex dispersions for innovative ...

Sep 23, 2021  Wen, S. Chung, D. D. L. Partial replacement of carbon fiber by carbon black in multifunctional cement–matrix composites. Carbon 45 , 505–513 (2007). CAS Article Google Scholar

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Smart Properties of Carbon Fiber Reinforced Cement-based ...

Jan 01, 2007  In this study carbon fiber reinforced cement-based composites (CFRC) are fabricated by compressing, and the smart properties of the composites are studied. The results show that there exists a remarkable negative temperature coefficient (NTC) and a positive temperature coefficient (PTC) in the composite.

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Fiber-Reinforced Magnesium Phosphate Cement-Based ...

Aug 03, 2021  Currently, fiber-reinforced magnesium phosphate cement-based nanocomposites are being used in various projects. The unique physical properties of this material allow it to bear the load together with the material in the inherent structure, and it will be better used in the field of bridge structure repair and reinforcement. The purpose of this article is to study the application of fiber ...

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US20090036573A1 - Cement-based composition for extrusion ...

In a cement-based extrusion molding composition, deterioration of productivity due to fluctuation of unburned carbon is prevented by ensuring excellent dispersibility of coal ash mainly composed of fly ash, the extrusion pressure in extrusion molding is reduced, and the strength of a molded product in the same curing condition as in single use of silica sand or silica stone powder is developed.

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Quantitative Evaluation of Carbon Fiber Dispersion in ...

Jan 30, 2021  Carbon fiber dispersion has a substantial influence on the properties of amorphous calcium silicate hydrate-based contact-hardening composites. In this study, a mixture of carbon fiber and calcium silicate hydrate powder was compressed into solid composites at 40 MPa for one minute. The mechanical properties and electrical resistivity of the solid materials were measured, and

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Quantitative Evaluation of Carbon Fiber Dispersion in ...

Jan 30, 2021  However, excessive carbon fiber content would cause fiber clusters, leading to a decreasing uniformity of the fiber dispersion. A quantitative relationship between the distribution coefficient ( α f ) and electrical resistivity ( ρ c ρ c ) was obtained based on the Taipalus model, and the expression was α f = 0.9236 − 448.0652 / ρ c α f ...

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CVD Treatment of Carbon Fibers and Evaluation of Their ...

Carbon-fiber-reinforced cement-based (CFRC) composites is a promising functional material which can be used both in the military and civil fields against electromagnetic interference. However, it is essential to make carbon fibers dispersed uniformly during the preparation of CFRC. In this work, short carbon fibers were treated through Chemical Vapor Deposition (CVD) process at high ...

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Carbon fiber reinforced cement mortar improved by using ...

Nov 01, 2001  Table 1, Table 2 show the tensile properties and electrical resistivity of mortars with and without silica fume, respectively. All mortars contained carbon fibers and the water/cement ratio was 0.35. The amount of water added to the mix containing a dispersion was less than 0.35 by mass of cement, due to the amount of water in the dispersion.

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A Study on Improving the Mechanical Performance of Carbon ...

Aug 24, 2019  The distribution in the cement can be evaluated using statistical approaches and electron microscopy. Furthermore, several research projects defined the dispersion coefficient of carbon fiber to evaluate the dispersion of fibers in the cement composites [8,9,10]. The mechanical characteristics of the cement composites depend on not only the ...

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Characterizing fiber dispersion in cement composites using ...

Jul 01, 2005  A novel method is developed to evaluate fiber dispersion issues in short (or discontinuous) fiber-reinforced cement composites. Fiber orientation, global segregation (i.e., as a result of gravitational settling or improper mixing), and local aggregation (i.e., small fiber agglomerates distributed uniformly throughout the matrix) are quantified using an electrical measurement technique.

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A Study on Improving the Mechanical Performance of Carbon ...

Aug 24, 2019  This study investigated several approaches for silane-removal from the surface of short carbon fiber bundles, and short carbon fibers uniformly dispersed in cement to produce a novel compound of carbon-fiber-reinforced cement. In order to facilitate the uniform distribution of short carbon fibers in the carbon-fiber-reinforced cement, it is necessary to remove the silane from the

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Partial replacement of carbon fiber by carbon black in ...

Mar 01, 2007  The electrical resistivity of cement paste without conductive admixture is 6 × 10 5 Ω cm . Table 1 shows that both carbon fiber and carbon black are effective in decreasing the resistivity. However, as shown in Table 1, carbon fiber is more effective than carbon black at the same mass content (whether 0.5% or 1.0% by mass of cement) in lowering the resistivity and in enhancing the

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Evaluation on mechanical enhancement and fire resistance ...

Evaluation on mechanical enhancement and fire resistance of carbon nanotube (CNT) Fig. 1 Schematic diagram showing the general mechanism of fiber reinforcement in cement composite. Gray color indicates solid and white indicates void. content covers FRC mechanism, CNT dispersion, CNT-cement structures, mechanical properties,

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Effect of Varying High and Low-Speed Churners on the ...

i-manager's Journal on Future Engineering and Technology, i-manager's Journal on Software Engineering, i-manager's Journal on Electrical Engineering, i-manager's Journal on Electronics Engineering, i-manager's Journal of Educational Technology, i-manager's Journal on Educational Psychology, i-manager's Journal on School Educational Technology, i-manager's Journal on English

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Publications – Decisionics

Evaluation of commercially available sensors for soil stress measurements. 12 th International Workshop on Structural Health Monitoring (IWSHM), Stanford, USA. C14. Heirani, N., Abouhussien, A., Azhari, F. (May 2019). Evaluation of fibers dispersion of cement-based

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HIGHLY-DISPERSED CARBON NANOTUBE-REINFORCED CEMENT-BASED ...

The present invention is directed to a method of producing highly dispersed carbon nanotubes (CNTs) reinforced cement-based composite materials by applying ultrasonic energy and using a surfactant to form a fluid dispersion of CNTs and mixing the dispersion and a cement material in a manner that CNTs can be well dispersed in the cementitious ...

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Preparation and microstructural properties study on cement ...

Dec 19, 2013  Effect of carbon fiber dispersion on the mechanical properties of carbon fiber-reinforced cement-based composite. Mater Sci Eng A 2008; ... Highly-dispersed carbon nanotubes reinforced cement-based materials. Patent Application, 0229494 A1, USA, 2009. Google Scholar. 15.

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1. Introduction - Scientific Research Publishing

Carbon fiber dispersion, which is a common topic, and usually difficult to cope with [1] [2] [3] [12] , greatly influences the properties of CFRC especially when carbon fibers were surface treated by CVD method in a high temperature furnace (900˚C - 1200˚C).

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