scholarly journals Carbon-fiber-reinforced cement-based sensors

2007 ◽  
Vol 34 (3) ◽  
pp. 284-290 ◽  
Author(s):  
Rose Mary Chacko ◽  
Nemkumar Banthia ◽  
Aftab A Mufti
Keyword(s):  
Electrical Resistivity ◽  
Carbon Fiber ◽  
Carbon Fibers ◽  
Volume Fraction ◽  
Compressive Strain ◽  
Chloride Concentration ◽  
Petroleum Pitch ◽  
Fiber Reinforced ◽  
Reinforced Cement ◽  
Carbon Fiber Reinforced

The addition of carbon fibers has proved to be one of the most effective ways of improving the electrical conductivity of ordinary cement pastes. This implies that such materials can be used in strain, temperature, and chemical sensing. The present study was aimed at the development of such sensors. Inexpensive, petroleum-pitch-based, mesophase, high-modulus carbon fibers were used throughout. It was seen that materials with high conductivity could be obtained by reinforcing hydrated cement paste with carbon fibers. Electronic conduction was seen as the dominant mode over electrolytic conduction. Compared with strain, the influence of temperature on the electrical resistivity was found to be insignificant, implying a lack of need for temperature correction. Results also indicate that these sensors can be excellent crack detectors.Key words: carbon-fiber-reinforced cement-based composites, structural health monitoring, sensor, electrical resistivity, compressive strain, temperature, moisture content, chloride concentration, fiber volume fraction, water/cementitious ratio, cracking.

Dispersion of carbon fibers and conductivity of carbon fiber-reinforced cement-based composites

2017 ◽  
Vol 43 (17) ◽  
pp. 15122-15132 ◽  
Author(s):  
Wang Chuang ◽  
Jiao Geng-sheng ◽  
Li Bing-liang ◽  
Peng Lei ◽  
Feng Ying ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Carbon Fibers ◽  
Fiber Reinforced ◽  
Reinforced Cement ◽  
Carbon Fiber Reinforced

Development of High Modulus/High Strength Carbon Fiber Reinforced Nanoparticle Filled Polyimide Based Multiscale Hybrid Composites

2010 ◽  
Vol 654-656 ◽  
pp. 2620-2623 ◽  
Author(s):  
Kimiyoshi Naito ◽  
Jenn Ming Yang ◽  
Yutaka Kagawa
Keyword(s):  
Carbon Fiber ◽  
Carbon Fibers ◽  
Volume Fraction ◽  
Hybrid Composites ◽  
Particle Volume Fraction ◽  
High Strength ◽  
High Modulus ◽  
Fiber Reinforced ◽  
Particle Volume ◽  
Carbon Fiber Reinforced

The polyacrylonitrile (PAN)-based and pitch-based carbon fiber-reinforced nanoparticle filled polyimide based multiscale hybrid composites have been fabricated using vacuum assisted resin transfer molding (VaRTM) and autoclave curing. The carbon fibers used in this study were high tensile strength PAN-based (T1000GB) and high modulus pitch-based (K13D) carbon fibers. Fiber orientations of the T1000GB/K13D hybrid composites were set to [0(T1000GB)/0(K13D)]2S (T1000GB and K13D unidirectional layers were alternately and symmetrically laminated). The fiber volume fraction was 50 vol% (T1000GB: 24.9 vol%, K13D: 25.1 vol%). Polyimide used in this study was a commercially available polyimide precursor solution (Skybond 703). Four different types of nanoparticle (25nm-C, 20-30nm-β-SiC, 130nm-β-SiC and 80nm-SiO2) and particle volume fraction was 5.0 vol% used for the inclusion. The tensile properties and fracture behavior of T1000GB/K13D nanoparticle filled and unfilled hybrid composites have been investigated. For 25nm-C, 20-30nm-β-SiC and 80nm-SiO2 nanoparticle filled and unfilled hybrid composites, the tensile stress-strain curves show a complicated shape. By the high modulus pitch-based carbon fiber, the hybrid composites show the high modulus in the initial stage of loading. Subsequently, when the high modulus carbon fiber begin to fail, the high strength fiber would hold the load (strength) and the material continues to endure high load without instantaneous failure.

Preparation of Carbon Fiber Reinforced Si-HA Bone Cements Composites

2010 ◽  
Vol 434-435 ◽  
pp. 627-629 ◽  
Author(s):  
Juan Ying Li ◽  
Jian Feng Huang ◽  
Li Yun Cao
Keyword(s):  
Carbon Fiber ◽  
Flexural Strength ◽  
Carbon Fibers ◽  
Sodium Citrate ◽  
Volume Fraction ◽  
Testing Machine ◽  
Gelling Agent ◽  
Bone Cements ◽  
Fiber Reinforced ◽  
Carbon Fiber Reinforced

Carbon fiber reinforced silicon-substituted hydroxyapatite (C(f)/Si-HA) bone cements composites were prepared by microwave chemical reaction with a later solidification process using carbamide, calcium nitrate, ammonium dibasic phosphate and ethyl silicate as raw materials, and buffer solutions of acrylic acid and itaconic acid as gelling agent. The influences of carbon fibers volume fraction, contents of coupling agents, sodium citrate contents on the flexural strength of silicon- substituted hydroxyapatite bone cements composites were particularly investigated. The phase composition, microstructures and flexural strength of the composites were characterized by X-ray diffraction, scanning electron microscope and universal testing machine analyses. And the flexural strength of the prepared composites reach the maximum value 41.5MPa when the carbon fibers volume fraction, silane agent KH550 and sodium citrate mass fraction arrive to 3.0, 0.6 and 3.0%, respectively.

Infiltration Characteristics of Carbon Fiber Reinforced MMCs

2010 ◽  
Vol 659 ◽  
pp. 229-234 ◽  
Author(s):  
Imre Norbert Orbulov ◽  
Árpád Németh
Keyword(s):  
Carbon Fiber ◽  
Carbon Fibers ◽  
Amorphous Carbon ◽  
Volume Fraction ◽  
Matrix Material ◽  
Intermetallic Phase ◽  
Aluminum Matrix ◽  
Fiber Reinforced ◽  
Pressure Infiltration ◽  
Carbon Fiber Reinforced

Carbon fiber reinforced aluminum matrix composite blocks and a pipe (as semi-product) were produced by pressure infiltration technique. In this paper the authors deal with the production method and investigations of the blocks and the pipe. In our composites AlSi12 eutectic aluminium-silicon alloy was used as matrix material. The reinforcements were ‘A’ and ‘B’ type carbon fibers (‘A’ having lower amorphous carbon content than ‘B’). The volume fraction of the fibers was outstanding – at least 55 vol%. Scanning electron microscopic investigations were done in order to observe the rather rough surface of the carbon fibres. X-ray diffraction and energy dispersive spectrometry was done in order to estimate the quantity of Al4C3 intermetallic phase at the carbon fiber/matrix interface region. The measurements showed that the quantity of Al4C3 strongly depends on the amorphous carbon quantity in carbon fibers. Much more Al4C3 was formed in the case of ‘A’ type reinforcement (less amorphous carbon), than in the case of ‘B’ type reinforcement (more amorphous carbon). The presence of Al4C3 crystals caused large scatter in the mechanical properties, the UTS was decreased, while the compressive strength was increased. Fracture surfaces were investigated: the composite showed rigid fracture.

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