Enhancing the Thermoelectric Properties in Carbon Fiber/Cement Composites by Using Steel Slag

2013 ◽  
Vol 539 ◽  
pp. 103-107 ◽  
Author(s):  
Jun Qing Zuo ◽  
Wu Yao ◽  
Jun Jie Qin
Keyword(s):  
Carbon Fiber ◽  
Linear Relationship ◽  
Thermoelectric Power ◽  
Thermoelectric Properties ◽  
Steel Slag ◽  
Experimental Results ◽  
Cement Composites ◽  
Temperature Differential ◽  
High Concentration ◽  
Good Linear

Thermoelectric properties of steel slag-carbon fiber/cement composites were studied in this paper. The effect of steel slag content on thermoelectric properties was focused on especially. The experimental results show that the addition of steel slag leads to an increase in the positive thermoelectric power of the cabon fiber/cement composites. The highest absolute thermoelectric power of carbon fiber/cement composites was rendered as positive as 14.4µV/°C by using steel slag, which had a high concentration of holes. Beside, a good linear relationship was observed between thermoelectric power and temperature differential on the specimen.

Enhanced thermoelectric properties of carbon fiber reinforced cement composites

2016 ◽  
Vol 42 (10) ◽  
pp. 11568-11573 ◽  
Author(s):  
Jian Wei ◽  
Qian Zhang ◽  
Lili Zhao ◽  
Lei Hao ◽  
Chunli Yang
Keyword(s):  
Carbon Fiber ◽  
Thermoelectric Properties ◽  
Cement Composites ◽  
Fiber Reinforced ◽  
Reinforced Cement ◽  
Carbon Fiber Reinforced

Investigation on Factors Influencing Workability of Recycled Aggregates Concrete

2013 ◽  
Vol 631-632 ◽  
pp. 733-739
Author(s):  
Chang Ping Chen ◽  
Fu Qiang He ◽  
Li Hong ◽  
Xian Qi Zhou
Keyword(s):  
Linear Relationship ◽  
Fresh Concrete ◽  
Experimental Results ◽  
Recycled Aggregates ◽  
Cement Ratio ◽  
Good Linear ◽  
Factors Influencing ◽  
Increase With Increase ◽  
Logarithmic Relationship ◽  
Water Amount

In order to investigate factors influencing workability of recycled aggregates (RA) concrete, such as water amount, sand ratio and RA replacement percentage, 10 pitch of RA concrete was prepared for measurement of workability and a formula was used for calculating effect of water amount on slump of RA concrete. Experimental results and formula induction indicated that there are logarithmic relationship between flowability of fresh concrete and water amount and ratio of aggregates to cement . The flowability will logarithmically increase with increase of water amount and decrease of aggregates cement ratio. The optimum sand ratio for RA concrete can be determined by measurement of slump. Slump decreases with RA replacement percentage and there is a very good linear relationship between them. When water amount increases, slump increases and when replacement percentage of RA increases, slump decrease. Under different water amount, effect degrees of replacement percentage of RA on slump are very similar and under different replacement percentage of RA, effect degrees of water amount on slump are also very similar.

Thermoelectric Power of Carbon Fiber Reinforced Cement Composites Enhanced by Ca3Co4O9

2013 ◽  
Vol 320 ◽  
pp. 354-357 ◽  
Author(s):  
Jian Wei ◽  
Lei Hao ◽  
Ge Ping He ◽  
Chun Li Yang
Keyword(s):  
Carbon Fiber ◽  
Thermoelectric Power ◽  
Solid Phase ◽  
Fold Increase ◽  
Phase Method ◽  
Cement Composites ◽  
Fiber Reinforced ◽  
Air Atmosphere ◽  
Reinforced Cement ◽  
Carbon Fiber Reinforced

Micro-sized Ca3Co4O9powder was prepared by solid phase method at 850-950°C in air atmosphere. Seebeck effect of carbon fiber reinforced cement composites was enhanced efficiently by combining the Ca3Co4O9powder of 3.0wt.% by mass of cement. The absolute thermoelectric power achieves 1.65 fold increase and is up to 58.6μV/°C at room temperature. The lower activation energy of holes carriers and higher carrier concentration by doping Ca3Co4O9, are probably attributed to the increase of absolute thermoelectric power.

Effect of moisture on the thermoelectric properties in expanded graphite/carbon fiber cement composites

2017 ◽  
Vol 43 (14) ◽  
pp. 10763-10769 ◽  
Author(s):  
Jian Wei ◽  
Qian Zhang ◽  
Lili Zhao ◽  
Lei Hao ◽  
Zhengbo Nie
Keyword(s):  
Carbon Fiber ◽  
Thermoelectric Properties ◽  
Expanded Graphite ◽  
Cement Composites ◽  
Effect Of Moisture

scholarly journals Effect of plasma surface modification on pullout characteristics of carbon fiber-reinforced cement composites

Carbon Trends ◽  
2021 ◽  
Vol 3 ◽  
pp. 100030
Author(s):  
Jin Hee Kim ◽  
Jong Hun Han ◽  
Seungki Hong ◽  
Doo-Won Kim ◽  
Sang Hee Park ◽  
...  
Keyword(s):  
Surface Modification ◽  
Carbon Fiber ◽  
Cement Composites ◽  
Fiber Reinforced ◽  
Plasma Surface Modification ◽  
Plasma Surface ◽  
Reinforced Cement ◽  
Carbon Fiber Reinforced

scholarly journals Effect of nano and micro conductive materials on conductive properties of carbon fiber reinforced concrete

2020 ◽  
Vol 9 (1) ◽  
pp. 445-454 ◽  
Author(s):  
Juhong Han ◽  
Dunbin Wang ◽  
Peng Zhang
Keyword(s):  
Carbon Fiber ◽  
Carbon Black ◽  
Steel Slag ◽  
Pressure Sensitivity ◽  
Electric Conduction ◽  
Conductive Materials ◽  
Slag Powder ◽  
Steel Slag Powder ◽  
Resistivity Variation ◽  
Nano Carbon

AbstractIn this study, the pressure sensitivity and temperature sensitivity of the diphasic electric conduction concrete were investigated by measuring the resistivity using the four-electrode method. The diphasic electric conduction concrete was obtained by mixing nano and micro conductive materials (carbon nanofibers, nano carbon black and steel slag powder) into the carbon fiber reinforced concrete (CFRC). The results indicated that, with the increase of conduction time, the resistivity of CFRC decreased slightly at the initial stage and then became steady, while the resistivity of CFRC containing nano carbon black had a sharp decrease at the dosage of 0.6%. With the increase of compression load, the coefficient of resistivity variation of CFRC containing nano carbon black and steel slag powder changed little. The coefficient of resistivity variation increased with the increase of steel slag powder in the dry environment, and CFRC had preferable pressure sensitivity when the mass fractions of carbon fiber and carbon nanofiber were 0.4% and 0.6%, respectively. Besides, in the humid environment, the coefficient of resistivity variation decreased with the increase of steel slag powder, and the diphasic electric conduction concrete containing 0.4% carbon fibers and 20% steel slag powder had the best pressure sensitivity under the damp environment. Moreover, in the dry environment, CFRC containing nano and micro conductive materials presented better temperature sensitivity in the heating stage than in the cooling stage no matter carbon nanofiber, nano carbon black or steel slag powder was used, especially for the CFRC containing steel slag powder.

Determination of Chitosan Oligosaccharide Content by Acetylacetone Spectrophotometry Method

2012 ◽  
Vol 503-504 ◽  
pp. 543-547 ◽  
Author(s):  
Ze Ping Xu ◽  
Chuan Lun Yang ◽  
Xin Qing Zhang ◽  
Xiu Zhi Wang ◽  
Bao Sheng Huang
Keyword(s):  
Hydrochloric Acid ◽  
Linear Relationship ◽  
Regression Equation ◽  
Common Method ◽  
Chitosan Oligosaccharide ◽  
Average Recovery ◽  
Good Linear ◽  
Good Linear Relationship

Objective: To establish a common method to detect the content of chitosan oligosaccharide. Methods: Chitosan oligosaccharide was hydrolyzed completely by concentrated hydrochloric acid, and the solution was regulated into neutral with NaOH. Then, determined the absorbance in 525nm, and substituted into the regression equation to determine the results. Results: The results showed there was a good linear relationship when the concentration of chitosan oligosaccharide ranged from 0.02 mg/mL to 0.12 mg/mL, r2 = 0.999. The average recovery of chitosan oligosaccharide samples was 99.25%. Conclusion: The method is sensitive, accurate and simple. It is applied to determine of the content of chitosan oligosaccharide.

Thermoelectric properties of Al1−xInxN and Al1−y−zGayInzN prepared by radio-frequency sputtering: Toward a thermoelectric power device

2003 ◽  
Vol 82 (13) ◽  
pp. 2065-2067 ◽  
Author(s):  
Shigeo Yamaguchi ◽  
Yasuo Iwamura ◽  
Atsushi Yamamoto
Keyword(s):  
Radio Frequency ◽  
Thermoelectric Power ◽  
Thermoelectric Properties ◽  
Power Device ◽  
Radio Frequency Sputtering
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