scholarly journals Mechanical and Electrical Characteristics of Graphite Tailing Concrete

2018 ◽  
Vol 2018 ◽  
pp. 1-9 ◽  
Author(s):  
Hongbo Liu ◽  
Kun Liu ◽  
Zhu Lan ◽  
Dashuang Zhang
Keyword(s):  
Electrical Conductivity ◽  
Compressive Strength ◽  
Electrical Resistivity ◽  
Carbon Fiber ◽  
Reasonable Agreement ◽  
Experimental Results ◽  
Orthogonal Experimental Design ◽  
Electrical Characteristics ◽  
Environment Problem ◽  
Pollution Problem

The graphite tailing causes serious environmental pollution, and the pollution problem becomes worse and worse with the increase in graphite demands. This paper focuses on the graphite tailing concrete, which can alleviate the environment problem through utilizing graphite tailings. With the orthogonal experimental design, 16 groups of specimens were designed to investigate the compressive strength of the graphite tailing concrete, and each group had 6 specimens. The significance sequence of the influencing factors for the compressive strength was studied, including the ratio of water to cement, sand ratio, graphite tailings content, and carbon fiber content. The optimal contents of graphite tailings and carbon fiber were obtained from the further experimental study on the electrical characteristics of the graphite tailing concrete, and a regression analysis was conducted to develop the predictive mixture design relationships for the electrical resistivity of the conductive graphite tailing concrete. The experimental results show that the conductive concrete mixture containing graphite tailings and carbon fiber has satisfactory mechanical strength along with well electrical conductivity. With the increase in graphite tailings content, the compressive strength decreases slowly, but the electrical resistivity decreases much more obviously. Predictions with the proposed relationship are in reasonable agreement with experimental results. This study provides references for the graphite tailing utilization alleviating the environment problems.

scholarly journals Influence of Carbon Fiber Incorporation on Electrical Conductivity of Cement Composites

2020 ◽  
Vol 10 (24) ◽  
pp. 8993
Author(s):  
Ilhwan You ◽  
Seung-Jung Lee ◽  
Goangseup Zi ◽  
Daehyun Lim
Keyword(s):  
Electrical Conductivity ◽  
Electrical Resistivity ◽  
Carbon Fiber ◽  
Percolation Threshold ◽  
Cement Composite ◽  
Electrode Spacing ◽  
Cement Composites ◽  
Different Types ◽  
The Difference

This study investigated the effects of carbon fiber (CF) length, electrode spacing, and probe configuration on the electrical conductivity of cement composites. Accordingly, 57 different types of samples were prepared, considering three different CF lengths, five different CF contents, three different electrode spacings, and two different probe configurations. This research found that the influence of CF length on the electrical resistivity of cement composite depends electrode spacing. For the cement composite with wide electrode spacing of 40 mm, its resistivity decreased as increasing CF length as in the previous study. However, when the electrode spacing is 10 mm, which is narrow (10 mm), the resistivity of the cement composite rather increased with increasing CF length. The results implied that when an electrode is designed for the cement composite incorporating CF, the CF length should be short compared to the electrode spacing. The percolation threshold of CF measured by the two-probe configuration was 2% or more. This is higher than that measured by the four-probe configuration (1%). At a lower CF content than 2%, the two-probe configuration gave higher resistivity of the cement composite than the four-probe configuration. However, the difference coming from the different probe configurations was marginal as increasing the CF content.

Electrical Conductivity of VGCF/ Aluminum Composites Fabricated by Electro Spark Sintering

2007 ◽  
Vol 561-565 ◽  
pp. 729-732 ◽  
Author(s):  
Gen Sasaki ◽  
Fumiaki Kondo ◽  
Kazuhiro Matsugi ◽  
Osamu Yanagisawa
Keyword(s):  
Electrical Conductivity ◽  
Residual Stress ◽  
Electrical Resistivity ◽  
Thermal Expansion ◽  
Carbon Fiber ◽  
Ultrasonic Vibration ◽  
Volume Fraction ◽  
Pure Aluminum ◽  
Average Diameter ◽  
Aluminum Powders

Vapor grown carbon fiber (VGCF) was sleaved in acetone with ultrasonic vibration. Then pure aluminum powders with 3 μm in average diameter was poured into VGCF containing acetone and mixed with ultrasonic vibration. The composites were fabricated by electro spark sintering. The strength, rigidity, electrical conductivity and microstructure of the composites was investigated. VGCF was distributed uniformly and no pores was observed in composite. As increasing the volume fraction of VGCF in composites, the strength of composites increased gradually but the elongation decreased. The electrical resistivity of the composites increased as increasing VGCF content, constantly. The theoretical resistivity of composites without residual stress is lower than that of experimental results. It seems that is caused by the high dislocation density and strain introduced by big difference of thermal expansion between VGCF and pure aluminum.

Laboratory Evaluation of Electrically Conductive Asphalt Mixtures for Snow and Ice Removal Applications

2021 ◽  
pp. 036119812199582
Author(s):  
Rahaf Hasan ◽  
Ayman Ali ◽  
Christopher Decarlo ◽  
Mohamed Elshaer ◽  
Yusuf Mehta
Keyword(s):  
Electrical Conductivity ◽  
Electrical Resistivity ◽  
Carbon Fiber ◽  
Asphalt Mixtures ◽  
Laboratory Evaluation ◽  
Particle Sizes ◽  
Rutting Resistance ◽  
Air Voids ◽  
Modified Asphalt ◽  
Performance Grade

The study evaluates the electrical conductivity and mechanical performance of graphite modified asphalt mixtures. The effects of air voids, carbon fiber, and binder performance grade (PG) on the electrical resistivity of graphite modified asphalt mixtures are also assessed. Three graphite grades, two asphalt binders (polymer-modified PG 76-22 and neat PG 64-22), one aggregate type, and one carbon fiber were used to produce graphite modified asphalt mixtures. The mixtures were produced without graphite (control mix, PG 76-22), with only graphite (three grades and PG 76-22), with both graphite and 1% carbon fiber (three grades and PG 76-22), and with graphite (all three grades) and PG 64-22. The electrical conductivity, resistance to rutting, resistance to cracking, and durability of these mixes were evaluated using electrical resistivity (using a multi-meter), asphalt pavement analyzer, Hamburg wheel tracking device, semi-circular bend, indirect tension cracking, and Cantabro loss tests. Test results showed that graphite improves the electrical conductivity of asphalt mixtures when added at dosages of 10% to 15% or higher by volume of binder. Graphite grades with larger particle sizes helped improve the conductivity of asphalt mixtures better than graphite grades with smaller particle sizes. Air voids (higher air voids increased resistivity), carbon fiber dosage (decreased resistivity), and binder performance grade (neat binders had lower resistivity) affected the electrical resistivity of graphite modified asphalt mixtures. Furthermore, graphite modified mixes had better rutting resistance but higher susceptibility to breakdown and cracking when compared with unmodified mixtures.

Assessment on the Electrical Conductivity of Additive Fillers into Carbon Fiber-Cement Based Composites

2011 ◽  
Vol 492 ◽  
pp. 185-188 ◽  
Author(s):  
Jun Jie Qin ◽  
Wu Yao ◽  
Jun Qing Zuo ◽  
Hai Yong Cao
Keyword(s):  
Carbon Nanotubes ◽  
Electrical Conductivity ◽  
Electrical Resistivity ◽  
Carbon Fiber ◽  
Percolation Threshold ◽  
Electrical Conduction ◽  
Cement Matrix ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

This paper gives an assessment on the electrical conductivity of different additive fillers (graphite, multi-walled carbon nanotubes) into carbon fiber-cement based composites (CFRC). Results show that cement matrix containing 0.4% carbon fiber (CF) and 0.5% multi-walled carbon nanotubes (MWCNTs) exhibits an excellent electrical conductivity of 33.65Ω·cm. When the content of CF is below the percolation threshold (0.4% CF), adding graphite is beneficial to the electrical conduction of CFRC, which has a tremendous drift from 3991.44Ω·cm to 524.33Ω·cm as the content of graphite varies from 0% to 30%. However, when the content of CF is above the percolation threshold, adding graphite makes no advantages in the electrical conductivity of CFRC because of leading to a porosity rising. MWCNTs are useful conductive constituents for CFRC and can increase electrical conductivity by two orders of magnitude. However, excessive adding MWCNTs into CFRC will have a rapid increase of electrical resistivity on the contrary.

Electrical conductivity and compressive strength of carbon fiber reinforced fly ash geopolymeric composites

2017 ◽  
Vol 135 ◽  
pp. 164-176 ◽  
Author(s):  
Panjasil Payakaniti ◽  
Supree Pinitsoontorn ◽  
Prasit Thongbai ◽  
Vittaya Amornkitbamrung ◽  
Prinya Chindaprasirt
Keyword(s):  
Electrical Conductivity ◽  
Compressive Strength ◽  
Fly Ash ◽  
Carbon Fiber ◽  
Fiber Reinforced ◽  
Carbon Fiber Reinforced

Effects of Conductive Phase on Properties of Concrete

2019 ◽  
Vol 960 ◽  
pp. 174-179
Author(s):  
Bao Zhen Fan ◽  
Zheng Gang Fang ◽  
Rui Liu ◽  
Hong Bing Shen
Keyword(s):  
Compressive Strength ◽  
Electrical Resistivity ◽  
Carbon Fiber ◽  
Lamellar Structure ◽  
Good Condition ◽  
Conductive Network ◽  
Hydration Products ◽  
Conductive Phase ◽  
Compressive Strength Of Concrete

In this paper, the effects of graphite and carbon fiber on the properties of concrete were studied, the 28d compressive strength and electrical resistivity of concrete were measured, and the microstructure of concrete was observed. The results show that the graphite could improve the conductivity of concrete meanwhile reduce the compressive strength, and that the carbon fiber can improve the compressive strength of concrete, but its influence is considerably limited. Only when the mixing amount of graphite is higher than 1%, the compressive strength of concrete will increase along with the increase of mixing amount of carbon fiber, and the lamellar structure of graphite will be obvious, and the lamellar connection between graphite flakes will be in good condition. When the mixing amount of carbon fiber is 0.8%, dense connection will be formed between the carbon fiber & graphite and the hydration products. The combined mixture of graphite and carbon fiber can form a dense and relatively complete conductive network and is beneficial to the improvement of compressive strength of concrete.

Influence of Compressive Strength of Concrete on Shear Strengthening of Reinforced Concrete Beams with Near Surface Mounted Carbon Fiber-Reinforced Polymer

Buildings ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 563
Author(s):  
Ma’en Abdel-Jaber ◽  
Mu’tasim Abdel-Jaber ◽  
Hasan Katkhuda ◽  
Nasim Shatarat ◽  
Rola El-Nimri
Keyword(s):  
Compressive Strength ◽  
Carbon Fiber ◽  
Experimental Results ◽  
Fiber Reinforced Polymer ◽  
Carbon Fiber Reinforced Polymer ◽  
Shear Strengthening ◽  
Near Surface ◽  
Strength Concrete ◽  
Reinforced Polymer ◽  
Near Surface Mounted

This paper investigates the effect of using near-surface mounted carbon fiber-reinforced polymer (NSM-CFRP) on the shear strengthening of rectangle beams with low strength concrete (f′c = 17 MPa), medium strength concrete (f′c = 32 MPa), and high strength concrete (f′c = 47 MPa). The experimental program was performed by installing NSM-CFRP strips vertically in three different configurations: aligned with the internal stirrups, one vertical NSM-CFRP strip between every two internal stirrups, and two vertical NSM-CFRP strips between every two internal stirrups. All tested beams were simply supported beams and tested under a three-point loading test. The experimental results were compared with the theoretical capacities that were calculated according to the ACI 440.2R-17 and finite element analysis (FEA) that was conducted using ABAQUS software to simulate the behavior of all beams. The experimental results indicated that using NSM-CFRP limited the failure mode of all beams to pure shear failure with no debonding or rapture of the carbon strips. Moreover, the use of NSM-CFRP proved its efficiency by increasing the shear capacity of all beams by a range of 4% to 66%, in which the best enhancement was recorded for the case of using two unaligned NSM-CFRP strips. In general, the experimental shear capacities increased with the increase in the compressive strength of all beams. On the other hand, the ACI 440.2R-17 was conservative in predicting the theoretical shear capacities, and the FEA results agreed well with the experimental results.

MALLORY 53B

Alloy Digest ◽  
1965 ◽  
Vol 14 (9) ◽  
Keyword(s):  
Electrical Conductivity ◽  
Compressive Strength ◽  
Corrosion Resistance ◽  
Physical Properties ◽  
Tensile Properties ◽  
Copper Alloy ◽  
High Strength ◽  
Heat Treating ◽  
High Heat ◽  
Excellent Corrosion Resistance

Abstract MALLORY 53B is an economical copper alloy combining high strength with high heat and electrical conductivity and excellent corrosion resistance. It is heat treatable. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and compressive strength. It also includes information on corrosion resistance as well as forming, heat treating, and machining. Filing Code: Cu-155. Producer or source: P. R. Mallory & Company Inc..

scholarly journals Undergraduate Research Program to Recycle Composite Waste

2021 ◽  
Vol 11 (7) ◽  
pp. 354
Author(s):  
Waleed Ahmed ◽  
Essam Zaneldin ◽  
Amged Al Hassan
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Carbon Fiber ◽  
Undergraduate Students ◽  
Research Program ◽  
Modulus Of Elasticity ◽  
Undergraduate Research ◽  
Undergraduate Research Program ◽  
Structural Applications ◽  
Cfrp Composite

With the rapid growth in the manufacturing industry and increased urbanization, higher amounts of composite material waste are being produced, causing severe threats to the environment. These environmental concerns, coupled with the fact that undergraduate students typically have minimal experience in research, have initiated the need at the UAE University to promote research among undergraduate students, leading to the development of a summer undergraduate research program. In this study, a recycling methodology is presented to test lab-fabricated Carbon-Fiber-Reinforced Polymer (CFRP) for potential applications in industrial composite waste. The work was conducted by two groups of undergraduate students at the UAE University. The methodology involved the chemical dissolution of the composite waste, followed by compression molding and adequate heat treatment for rapid curing of CFRP. Subsequently, the CFRP samples were divided into three groups based on their geometrical distinctions. The mechanical properties (i.e., modulus of elasticity and compressive strength) were determined through material testing, and the results were then compared with steel for prompt reference. The results revealed that the values of mechanical properties range from 2 to 4.3 GPa for the modulus of elasticity and from 203.7 to 301.5 MPa for the compressive strength. These values are considered competitive and optimal, and as such, carbon fiber waste can be used as an alternate material for various structural applications. The inconsistencies in the values are due to discrepancies in the procedure as a result of the lack of specialized equipment for handling CFRP waste material. The study concluded that the properties of CFRP composite prepreg scrap tend to be reusable instead of disposable. Despite the meager experimental discrepancies, test values and mechanical properties indicate that CFRP composite can be successfully used as a material for nonstructural applications.

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