Research on Optimizing the Electrical and Mechanical Properties of Carbon Fiber Reinforced Cement

2013 ◽  
Vol 539 ◽  
pp. 94-98 ◽  
Author(s):  
Jing Xu ◽  
Wu Yao
Keyword(s):  
Mechanical Properties ◽  
Carbon Fiber ◽  
Surface Treatment ◽  
Fiber Surface ◽  
Fiber Reinforced ◽  
Cement Ratio ◽  
Water To Cement Ratio ◽  
Reinforced Cement ◽  
Carbon Fiber Reinforced ◽  
Fiber Surface Treatment

Using orthogonal experimental design, the influence of water-to-cement ratio, silica fume content, and fiber surface treatment on the electrical and mechanical properties of carbon fiber reinforced cement was studied. Moreover, the surface appearance of fibers with and without surface treatment was investigated by means of scanning electron microscopy. The results show that the effect of water-to-cement ratio on conductivity is the largest among all the three factors. Fiber surface treatment plays an important role in the mechanical properties of CFRC and the optimum way is HNO3 treatment. By adopting the method of efficiency coefficient, the best combination can be determined effectively.

Effects of fiber surface treatments on mechanical properties of T700 carbon fiber reinforced BN–Si3N4 composites

2007 ◽  
Vol 471 (1-2) ◽  
pp. 169-173 ◽  
Author(s):  
Bin Li ◽  
Chang-Rui Zhang ◽  
Feng Cao ◽  
Si-Qing Wang ◽  
Bang Chen ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Carbon Fiber ◽  
Fiber Surface ◽  
Surface Treatments ◽  
Fiber Reinforced ◽  
Carbon Fiber Reinforced

Effect of Fiber Surface Treatment on Interfacial Mechano-Electric Properties of Carbon Fiber Reinforced Concrete

2011 ◽  
Vol 211-212 ◽  
pp. 1087-1090 ◽  
Author(s):  
Cui Xiang Jiang ◽  
Rui Li ◽  
Ji Yun Mo ◽  
Dong Wang Zhong
Keyword(s):  
Reinforced Concrete ◽  
Carbon Fiber ◽  
Surface Treatment ◽  
Bonding Strength ◽  
Fiber Surface ◽  
Electric Properties ◽  
Interfacial Bonding ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Fiber Surface Treatment

The effect of carbon fiber surface treatment on interfacial mechano-electric properties of carbon fiber reinforced concrete is studied by single fiber pull-out testing. As-received carbon fiber is with poor surface polarity, and the fiber-matrix interface bonding strength is low. Surface treatment of the carbon fiber improves both the interfacial bonding strength and the interfacial ductility. The interfacial bonding force and interfacial resistance increased linearly with increasing displacement until the fiber-matrix debonding was completed. The superior interfacial mechanical properties can help improve the strain-sensing ability relates to the better repeatability and reliability. But the sensitivity decreases to some extent.

Effect of Heat Treatment on Mechanical Properties of Laminated Carbon Fiber Reinforced Polymeric Composites

2016 ◽  
Author(s):  
A. B. M. I. Islam ◽  
Ajit D. Kelkar ◽  
Lifeng Zhang
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Carbon Fiber ◽  
Carbon Fibers ◽  
Fiber Surface ◽  
Fiber Reinforced ◽  
Carbon Fabric ◽  
Carbon Fiber Reinforced ◽  
Fiber Deposition ◽  
Pan Fibers

In recent years use of electrospun nanofibers and nanoparticles to improve the interlaminar properties have increased significantly. In most of the cases the additional interlaminar phase of nanofibers is required to go through various thermal and/or chemical processes. There has been emphasis to optimize the interlaminar nanofiber layers to achieve the optimum desired mechanical properties such as interlaminar strength. One common practice is to disperse nanofibers into the resin and then use the nanofiber enhanced resin to fabricate the laminated composites. However, proper dispersion and fiber filtering out are some of the problems that exist in fabrication using the nanofiber mixed resin approach. To alleviate this problem, an innovative approach of growing PAN (polyacrylnitrile) nano fibers directly on carbon fabric by electrospinning seems to solve the dispersion and fiber filtering problem. However, as PAN fibers require stabilization and carbonization, it is obvious that carbon fabric with PAN fiber deposition will have to undergo stabilization and carbonization process. The effect of stabilization and carbonization heat treatment on the mechanical properties of carbon fiber fabric is not yet fully understood. This paper presents the effects of heat treatment on carbon fabric used for fabricating laminated carbon fiber reinforced composite with epoxy resin. The heat treatment was performed at 280°C in air for six hours, and 1200°C for one hour in nitrogen which are similar to stabilization and carbonization of pure PAN fibers. The effects, due to heat treatment, were mainly characterized in terms of mechanical properties by performing tensile tests and shear tests. Fiber surface topography was observed by SEM to analyze physical changes. Chemical changes, corresponding to the existing groups with carbon fibers, were examined through FTIR. The results obtained are compared with a set of control laminated composite specimens, which were fabricated using heat vacuum assisted resin transfer molding (HVARTM) process and cured at 149°C. The two sets of composite were infused with resin in a single vacuum bag to ensure that both sets of specimens have identical resin infusion and cure cycle. Laminates used for making control specimens were fabricated using carbon fabric which did not undergo any heat treatment. A change in laminate thickness for heat treated carbon fabric was observed indicating a possible bulk up of the carbon fibers due to loss of sizing compounds, which also resulted into significant change in tensile properties.

Influence of Oxygen Plasma Surface Treatment of PET Micro Fibers on Flexural Strength of Reinforced Cement Pastes

2016 ◽  
Vol 825 ◽  
pp. 73-76
Author(s):  
Jan Trejbal ◽  
Jan Bartoš ◽  
Lubomír Kopecký ◽  
Pavla Ryparová ◽  
Štěpán Potocký
Keyword(s):  
Surface Treatment ◽  
Oxygen Plasma ◽  
Fiber Surface ◽  
Cement Matrix ◽  
Cement Pastes ◽  
Softening Behavior ◽  
Plasma Surface Treatment ◽  
Water To Cement Ratio ◽  
Reinforced Cement ◽  
Fiber Surface Treatment

Presented work deals with PET (polyethylene terephthalate) fiber-reinforced cement pastes and cool oxygen plasma fiber surface treatment used to attain the better adhesion between fibers surface and the cement matrix. Three sets of cement paste samples were made with the same matrix (CEM I 42.5R with water to cement ratio equal to 0.4). The two sample sets contained micro fiber reinforcement varying in surface properties. One set was reinforced with unmodified fibers, while in to the other set plasma treated fibers were used. As a comparative indicator to bending response of the composite materials, four-point destructive tests were carried out. The samples reinforced with unmodified fibers exhibited deflection-softening behavior during the post-cracking phase, while samples with plasma treated fibers exhibited deflection-hardening behavior.

Sign in / Sign up

Export Citation Format

Share Document