The Influence of Carboxy Methyl Cellulose (CMC) and Solution pH on Carbon Fiber Dispersion in White Cement Matrix

Dispersion of carbon fiber in cement matrix is one of main challenges for fabricating carbon fiber reinforced cement based materials. In this study, the dispersion of carbon fiber was improved by pre-dispersion of carbon fiber in basic aqueous solution using different concentrations of CMC. The relationships of CMC concentration and pH solution toward carbon fiber dispersion in aqueous solution was evaluated by UVvis spectroscopy. In order to understand how carbon fiber is dispersed in cement matrix, morphology fiber carbon reinforced composite was examined. Experimental results show that aqueous solution of CMC is effective to disperse carbon fiber. In addition, dispersion of carbon fiber increases with increasing of pH of CMC solution.

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Mechanical and Strain-Sensing Properties of Cement-Matrix Composite Containing Nano-Sized Carbon Black

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.815.203 ◽

2019 ◽

Vol 815 ◽

pp. 203-209

Author(s):

Yan Feng Wang ◽

Yi Zhao ◽

Xiao Hua Zhao ◽

Ran Hai

Keyword(s):

Carbon Black ◽

Compressive Loading ◽

Cement Matrix ◽

Structural Function ◽

Matrix Composites ◽

Strain Sensing ◽

Reinforced Composite ◽

Carbon Fiber Reinforced Composites ◽

Reinforced Cement ◽

Experimental Researches

An experimental researches was performed for carbon black-reinforced cement-matrix composites. The carbon black used was in the form of particles with a nano-size. Results show that when content of the carbon black is between 0.25% and 0.75% by weight of cement, both flexural and compressive strengths of the composite can be enhanced. Flexural strength increases up to 9.69%, and compressive strength increases up to 6.92%, respectively. Moreover, the carbon black-reinforced composite is of high strain-sensing ability. The fractional change in resistance () increases monotonically upon compressive loading, and decreases monotonically upon unloading. These properties indicate that the carbon black-reinforced composite can be used for structural function, while at the same time act as a strain sensor itself. Compared with carbon fiber-reinforced composites, the carbon black-reinforced composite has a low price and is easy for mixing.

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Preparation of wrapped nZVI particles and their application for the degradation of trichloroethylene (TCE) in aqueous solution

Journal of Water Reuse and Desalination ◽

10.2166/wrd.2015.082 ◽

2015 ◽

Vol 5 (3) ◽

pp. 335-343 ◽

Cited By ~ 2

Author(s):

Wenjing Fan ◽

Yue Cheng ◽

Shuzhen Yu ◽

Xiaofeng Fan ◽

Yaqian Deng

Keyword(s):

Electron Microscopy ◽

Aqueous Solution ◽

Methyl Cellulose ◽

Order Reaction ◽

Phase Reaction ◽

Solution Ph ◽

First Order ◽

Structure And Morphology ◽

Transmission Electron ◽

Optimal Ph

Three types of wrappped nanoscale zero-valent iron (W-nZVI) with different coatings including agar, starch, and carboxyl methyl cellulose, were synthesized using a rheological phase reaction method. The structure and morphology of W-nZVI particles were characterized by scanning electron microscopy and transmission electron microscopy. Batch degradation experiments exhibited that W-nZVI dosage, initial trichloroethylene (TCE) concentration and solution pH had significant effects on TCE dechlorination. Experimental results proved that the highest dechlorination efficiency was obtained within 320 minutes for 10 mg/L of TCE at the optimal pH of 5.0 and W-nZVI dosage of 0.5 g/L. Kinetic study revealed that TCE dechlorination by W-nZVI in aqueous solution obeyed the quasi-first-order reaction kinetics. The product after the reaction could be easily separated by the permanent magnet for re-use.

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Electromagnetic Interference of Ferrocene-Doped Carbon Fiber-Reinforced Cement Composites

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.261-263.638 ◽

2011 ◽

Vol 261-263 ◽

pp. 638-641

Author(s):

Chuang Wang ◽

Ke Zhi Li ◽

Zhen Jun Wang ◽

Geng Sheng Jiao

Keyword(s):

Carbon Fiber ◽

Electromagnetic Interference ◽

Cement Matrix ◽

Cement Composites ◽

Matrix Composites ◽

Fiber Reinforced ◽

Frequency Range ◽

Maximum Reflectivity ◽

Reinforced Cement ◽

Carbon Fiber Reinforced

The reflectivity of ferrocene-doped carbon fiber-reinforced cement-matrix composites against the electromagnetic radiation was measured in the frequency range of 8-18 GHz for different carbon fiber contents of 0.4, 0.6, 0.89, 1.33, and 1.78 wt% by mass of cement. The ferrocene was doped in 0.89, 1.78, 3.56, 4.89, and 6.27 wt% by mass of cement respectively. The maximum reflectivity reached -4.0 dB when the fiber percentage was 0.89 and the ferrocene was 3.56. The microwave was attenuated by 64 % through reflection. The minimum reflectivity -7.5 dB occurred when the fiber percentage was 1.33 and the ferrocene percentage was 4.89. The microwave was attenuated by 67.5 % through absorption. Prior to the fiber percentage of 0.89 and the ferrocene percentage of 3.56, the reflectivity kept rising.

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Effect of carbon fiber dispersion on the mechanical properties of carbon fiber-reinforced cement-based composites

Materials Science and Engineering A ◽

10.1016/j.msea.2007.09.073 ◽

2008 ◽

Vol 487 (1-2) ◽

pp. 52-57 ◽

Cited By ~ 74

Author(s):

Chuang Wang ◽

Ke-Zhi Li ◽

He-Jun Li ◽

Geng-Sheng Jiao ◽

Jinhua Lu ◽

...

Keyword(s):

Mechanical Properties ◽

Carbon Fiber ◽

Fiber Reinforced ◽

Fiber Dispersion ◽

Reinforced Cement ◽

Carbon Fiber Reinforced

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Study on the Mechanical Properties and Strengthening Mechanism of Interface-Modified Carbon Fiber Mesh Reinforced Cement-Based Composites with SCA&HMC

Molecules ◽

10.3390/molecules24213989 ◽

2019 ◽

Vol 24 (21) ◽

pp. 3989

Author(s):

Bo Wu ◽

Xiaohai Xu ◽

Shigang Luo ◽

Dedao Yan ◽

Kai Song ◽

...

Keyword(s):

Carbon Fiber ◽

Epoxy Resin ◽

Load Transfer ◽

Strengthening Mechanism ◽

Longitudinal Shear ◽

Cement Matrix ◽

Base Surface ◽

Specific Strength ◽

Reinforced Cement ◽

Fiber Mesh

Carbon fiber mesh reinforced cement-based composites (CMCCs) have received extensive attention in the field of engineering repair and structural reinforcement due to their outstanding properties such as two-way force, rust prevention, high specific strength, and low base surface requirements. However, the development of this material has been slowed down to some extent due to the poor interfacial bonding between the carbon fiber mesh and the cement matrix. In this paper, a novel fabrication strategy was proposed in which the carbon fiber mesh was modified with epoxy resin and silane coupling agent (SCA) to increase its surface chemical activity. Meanwhile, the hydroxymethyl cellulose (HMC) was also filled into the concrete matrix to improve the mechanical strength of the matrix as well as the load transfer behaviors between the mortar and carbon fiber (CF) mesh. The potential to employ SCA and HMC was evaluated for the making of CMCCs via the above methods. The results showed that the longitudinal shear strength of composites with SCA and SCA&HMC increased by 26.6% and 56.1% compared to those of CF with epoxy resin (EP) reinforced composites, respectively. The flexural strength of composite with SCA&HMC increases by 147.6% compared to I-(F) without CF. The novel II-HCM&CF/EP-SCA composites with excellent performance are promised to be applied in practical uses.

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Measurement of crack length sensitivity and strain gage factor of carbon fiber reinforced cement matrix composites

Measurement ◽

10.1016/j.measurement.2015.07.021 ◽

2015 ◽

Vol 74 ◽

pp. 21-30 ◽

Cited By ~ 23

Author(s):

Egemen Teomete

Keyword(s):

Carbon Fiber ◽

Crack Length ◽

Strain Gage ◽

Cement Matrix ◽

Matrix Composites ◽

Fiber Reinforced ◽

Gage Factor ◽

Reinforced Cement ◽

Carbon Fiber Reinforced

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Effects of Moisture on Mechanical and Piezoresistive Properties of Cement Composites containing Carbon Fiber during long age

E3S Web of Conferences ◽

10.1051/e3sconf/202124503061 ◽

2021 ◽

Vol 245 ◽

pp. 03061

Author(s):

Wangyanfeng ◽

Zhaoxiaohua ◽

Zhaoyi ◽

Bianyadong

Keyword(s):

Compressive Strength ◽

Carbon Fiber ◽

Stress Amplitude ◽

Cement Matrix ◽

Gauge Factor ◽

Cement Composites ◽

Matrix Composites ◽

Fiber Reinforced ◽

Reinforced Cement ◽

Carbon Fiber Reinforced

This paper presents a compressive test program designed to determine the mechanical and self-sensing properties of cement-matrix composites containing carbon fiber. Two kinds of mixes with 0.5% and 0.75% carbon fiber （CF） were prepared. The mechanical and piezoresistive properties of the cement-matrix composites were evaluated at 28, 90, 180, 270, and 360 d. The results show that the mechanical properties were enhanced in most cases. However, the compressive strength of carbon fiber reinforced cement-matrix composites decreased compared with the reference mix at the early curing ages, which agrees with the results mentioned in the literature. What is worth to mention, the 360 d compressive strength of carbon fiber reinforced cement-matrix composites reached the same level as that of the reference. Moreover, both negative and positive piezoresistivity were observed during the experiments. The amplitude of piezoresistivity was found to change with the variation of moisture content, and was not directly proportional to the magnitude of the stress. In the elastic stage with smaller stress amplitude, the piezoresistivity amplitude was larger. When the stress amplitude was multiplied, the piezoresistivity change was not synchronous. The gauge factor for the composite with 0.75% CF was higher than that of the composite with 0.5% CF and commercially available strain gauges.

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Heterogeneous Fenton Catalytic Removal of Organic Pollutant in Aqueous Solution by using Coal Gangue as a Catalyst

Recent Innovations in Chemical Engineering (Formerly Recent Patents on Chemical Engineering) ◽

10.2174/2405520412666190806120033 ◽

2019 ◽

Vol 12 (4) ◽

pp. 312-325

Author(s):

Jiwei Zhang ◽

Jingjing Xu ◽

Shuaixia Liu ◽

Baoxiang Gu ◽

Feng Chen ◽

...

Keyword(s):

Aqueous Solution ◽

Hydrogen Peroxide ◽

Hydroxyl Radical ◽

Removal Rate ◽

Organic Pollutant ◽

Coal Gangue ◽

Ion Leakage ◽

Heterogeneous Fenton ◽

Solution Ph ◽

X Ray

Background: Coal gangue was used as a catalyst in heterogeneous Fenton process for the degradation of azo dye and phenol. The influencing factors, such as solution pH gangue concentration and hydrogen peroxide dosage were investigated, and the reaction mechanism between coal gangue and hydrogen peroxide was also discussed. Methods: Experimental results showed that coal gangue has the ability to activate hydrogen peroxide to degrade environmental pollutants in aqueous solution. Under optimal conditions, after 60 minutes of treatment, more than 90.57% of reactive red dye was removed, and the removal efficiency of Chemical Oxygen Demand (COD) up to 72.83%. Results: Both hydroxyl radical and superoxide radical anion participated in the degradation of organic pollutant but hydroxyl radical predominated. Stability tests for coal gangue were also carried out via the continuous degradation experiment and ion leakage analysis. After five times continuous degradation, dye removal rate decreased slightly and the leached Fe was still at very low level (2.24-3.02 mg L-1). The results of Scanning Electron Microscope (SEM), energy dispersive X-Ray Spectrometer (EDS) and X-Ray Powder Diffraction (XRD) indicated that coal gangue catalyst is stable after five times continuous reuse. Conclusion: The progress in this research suggested that coal gangue is a potential nature catalyst for the efficient degradation of organic pollutant in water and wastewater via the Fenton reaction.

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