Effect of Carbon Fiber Gradient Distribution on Heat Property of Electrically Conductive Cement Mortar

2011 ◽  
Vol 415-417 ◽  
pp. 1474-1477
Author(s):  
Ran Hai
Keyword(s):  
Thermal Stress ◽  
Carbon Fiber ◽  
Cement Mortar ◽  
Heat Stability ◽  
Fiber Reinforced Concrete ◽  
Electrically Conductive ◽  
Gradient Distribution ◽  
Stress Maximum ◽  
Thermal Layer ◽  
Heat Property

Abstract. Based on the electro-thermal property of carbon fiber-reinforced concrete, two groups of carbon fiber with equal quality dispersed in cement mortar deferring to layered and gradient distribution separately. The heat change of electro-thermal layer (with carbon fiber) and non- electro-thermal layer (without carbon fiber) of the two kinds of specimen was contrasted, and the corresponding thermal stress value among each layer was calculated theoretically. The results indicate that comparing with the carbon fiber layered distribution, carbon fiber gradient distribution decreases the thermal stress maximum of neighboring layers from 15.42MPa to 5.21MPa. The decrease of heating stress increases heat stability, by which can enhance cement mortar service life.

Surface Modification of Carbon Fiber by Polymer Emulsions and Mechanical Property of Modified Carbon Reinforced Concrete

2011 ◽  
Vol 233-235 ◽  
pp. 2002-2005 ◽  
Author(s):  
Dong Lin ◽  
Chao Jin Wang ◽  
Feng Bo Dong ◽  
Song Lou ◽  
Chong Qi Shou
Keyword(s):  
Mechanical Property ◽  
Tensile Strength ◽  
Reinforced Concrete ◽  
Carbon Fiber ◽  
Cement Mortar ◽  
Fiber Reinforced Concrete ◽  
Coal Pitch ◽  
Fiber Reinforced ◽  
Carbon Fiber Reinforced ◽  
Coated Carbon

Four kinds of polymer emulsions were coated on the surface of coal pitch carbon fiber using atomized flow static coating method. The surface morphology of the carbon fiber after modification was analyzed by fluorescence microscope.The tensile strength of coated carbon fiber in the cement mortar and the mechanical property of the coated carbon fiber reinforced concrete were tested. The results showed that all the polymer emulsions were coated successfully on the surface of carbon fiber. The tensile strength of the coated carbon fiber in the cement mortar increased obviously, specially for the carbon fiber coated by meta chloride copolymer emulsion, whose tensile strength improved by 61%. The tensile strength of the coated carbon fiber reinforced concrete increased by 11%, the fracture energy increased by 47% and the max crack width increased by 18.5% when the content of the carbon fiber coated by meta chloride copolymer was 1.7 kg/m3.

scholarly journals Effect of Super Plasticizers on Fresh and Hardened State Properties of Short Carbon Fiber Reinforced Electrically Conductive Concrete

2020 ◽  
Vol 8 (5) ◽  
pp. 2644-2650
Keyword(s):  
Carbon Fiber ◽  
Carbon Fibers ◽  
Strength Properties ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Electrically Conductive ◽  
Negative Effect ◽  
Hardened State ◽  
Carbon Fiber Reinforced ◽  
The Impact

This study enlightens the influence of superplasticizers (SP) on the dispersion and distribution of carbon fibers in the carbon fiber reinforced concrete (CFRC) cast with a low w/c ratio. The effectiveness of Polycarboxylate ether (PCE) based SP in the enhancement of workability of concrete and deagglomeration of carbon fibers in CFRC has been studied extensively in this study. The effect of PCE based SP on the compressive strength properties and electrical properties of the CFRC were also studied. The microstructure of the CFRC specimens was also analyzed to study the impact of SP on the deagglomeration of carbon fibers in CFRC. It was observed that the inclusion of carbon fibers in the dry concrete mixes without SP showed a negative effect on the functional properties of concrete whereas the inclusion of SP in the CFRC mixes improved the mobility and viscosity of the CFRC mixes. The fresh and hardened state properties were effectively enhanced with the use of SP in the CFRC mixes. The magnitude of decrease in electrical resistance was better in SP based CFRC resulting in more electrical conductivity. The microstructure of the CFRC indicated improvement in the distribution of carbon fibers in SP based CFRC.

Experimental Research on Reinforcing Effect of Spiral Steel Fiber

2012 ◽  
Vol 174-177 ◽  
pp. 668-671
Author(s):  
He Ting Zhou
Keyword(s):  
Reinforced Concrete ◽  
Bond Strength ◽  
Experimental Research ◽  
Significant Role ◽  
Steel Fiber ◽  
Cement Mortar ◽  
Fiber Reinforced Concrete ◽  
Steel Fibers ◽  
Steel Fiber Reinforced Concrete ◽  
Reinforcing Effect

Steel fiber has a fine nature in reinforcing concrete. This essay aims to find out the influence of physical forms of steel fiber on its nature of reinforcement. By comparing two types of cement mortar reinforced by steel fibers, it is found that spiral steel fibers have a better bond strength with matrix than straight ones. Therefore, a conclusion could be drawn that physical forms of the steel fiber play a significant role in steel fiber reinforced concrete, and the experiment also serves a rewarding reference to the application of spiral steel fibers.

Thermal Expansion Coefficients and Thermal Stresses in an Aligned Short Fiber Composite With Application to a Short Carbon Fiber/Aluminum

1985 ◽  
Vol 52 (4) ◽  
pp. 806-810 ◽  
Author(s):  
Y. Takao ◽  
M. Taya
Keyword(s):  
Thermal Expansion ◽  
Thermal Stress ◽  
Carbon Fiber ◽  
Thermal Stresses ◽  
Short Fiber ◽  
Short Carbon Fiber ◽  
Thermal Expansion Coefficients ◽  
Equivalent Inclusion Method ◽  
Expansion Coefficients ◽  
Short Carbon

A formulation to compute the effective thermal expansion coefficients (αc) of an anisotropic short fiber-reinforced composite and the thermal stress (σ) induced in and around the fiber is developed. The formulation is based on the Eshelby’s equivalent inclusion method. Main emphasis is placed on short Carbon fiber/Aluminum. The thermal stress due to a uniform temperature rise ΔT is computed at points just outside the fiber. The effects of various parameters on αc and σ are also investigated.

Experimental Research on Mechanical Behavior of Carbon Fiber Reinforced Concrete Beam

2013 ◽  
Vol 641-642 ◽  
pp. 393-397
Author(s):  
Le Zhou ◽  
Jun Wei Wang ◽  
Hong Tao Liu
Keyword(s):  
Carbon Fiber ◽  
Cross Section ◽  
Brittle Failure ◽  
Concrete Beam ◽  
Concrete Beams ◽  
Reinforced Concrete Beam ◽  
Fiber Reinforced Concrete ◽  
Test Model ◽  
Steel Bar ◽  
Fiber Concrete

Based on the cross-section bending of 5 carbon fiber concrete beams, the mechanism of deflection and strain of carbon fiber concrete beam were studied considering the variation of the length of carbon fiber. The experimental results show that the deflection of destruction increased with the increase of the length of the carbon fiber. The carbon fiber can effectively improve the brittle failure of concrete beam, and the stain of concrete accorded with that steel bar at the same height. According to the existing test model, the theoretical calculating formula of CFRC was proposed.

scholarly journals Development of Carbon Fiber-modified Electrically Conductive Concrete for Implementation in Des Moines International Airport

2018 ◽  
Vol 8 ◽  
pp. 277-291 ◽  
Author(s):  
Alireza Sassani ◽  
Halil Ceylan ◽  
Sunghwan Kim ◽  
Ali Arabzadeh ◽  
Peter C. Taylor ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Electrically Conductive ◽  
International Airport ◽  
Des Moines
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