heating and de-icing function in conductive concrete and cement paste with the hybrid addition of carbon nanotubes and graphite

US7628949B2

Concrete structures containing the electrical heating capability taught herein are also included within the invention. A method of controlling the cure of concrete structures using intralaminar heat generated by applying electrical energy to electrically conductive members disposed within the structures.

Influence of chemically treated carbon fibers on the

The effects of carbon fiber and its surface treatment through chemical solutions on the mechanical properties and electromagnetic (EM) shielding of ultra-high-performance fiber-reinforced concrete (UHPFRC) were analyzed. Three types of carbon fibers chemically treated with sodium hydroxide, nitric acid, and ammonia solutions were evaluated, along with a plain carbon fiber control sample, at

Carbon nanomaterials enhanced cement

Carbon nanomaterials, predominantly carbon nanofibers, carbon nanotubes, graphene, graphene nanoplates, graphene oxide and reduced graphene oxide, possess superior chemical, physical and mechanical properties. They have been successfully introduced into ordinary Portland cement to give enhancements in terms of mechanical properties, durability and electrical/thermal conductivity, and to

Smart Materials and Structures

Heating and de-icing function in conductive concrete and cement paste with the hybrid addition of carbon nanotubes and graphite products. (2021) CATALINA FARCAS, Oscar Galao, ROSA NAVARRO, EMILIO ZORNOZA, FRANCISCO JAVIER BAEZA, BEATRIZ DEL MORAL, RAFAEL PLA, PEDRO GARCES

Electrical Joule heating of cementitious nanocomposites

2020/11/16Gomis et al compared the self-heating and de-icing properties of cements with different carbon fillers such as graphite, different short carbon fibres, CNF and CNT. They found the best performance using CNTs at 5 wt.% within voltages ranging between 5 V and 150 V and high water-to-cement ratios of up to 1.5 [ 30 ].

Marine Civil

These ions may be present as a result of chloride contamination of the concrete materials at the time of placing, or by ingress from external sources such as a marine environment or de-icing salts. The mechanism by which chloride ions disrupt the passive layer is unclear but empirical testing has allowed a threshold contamination level to be defined with a high degree of confidence.

Best PDD PPD Flashcards

A portland cement paste made with a low water-cement ratio will be much more resistant to damage by freezing and thawing than one with a higher water-cement ratio. Furthermore, introducing entrained air into concrete will significantly increase its resistance to freezing and thawing damage and the application of de

ABSTRACT

MC Materiales de Construccin 0465-2746 Consejo Superior de Investigaciones Cientificas MC201830_e172 10.3989/mc.2018.09617 Articles Theoretical and experimental analysis of multifunctional high performance cement mortar matrices reinforced with varying lengths of carbon fibers Anlisis terico y experimental de matrices multifuncionales de mortero de cemento de alta

Nondestructive Characterization and Monitoring of

Carbon nanotube-based structural health monitoring for fiber reinforced composite materials Author(s): Study on temperature and damage sensing capability of Portland cement paste through the thermoelectric measurements Tsung-Chin Hou; Ko-HungYu-Min

Modern engineering materials

These bonds, which are similar to those of graphite and stronger than those found in alkanes and diamond (sp3-hybrid carbon atoms), provide nanotubes with their unique strength. 13. Single-walled SWNTs have a diameter of close to 1 nanometre, and can be many millions of times longer. The way the graphene sheet is wrapped is represented by a pair of indices (n,m).

Poly(Ethylene Glycol)/β

2021/4/28Pseudorotaxane complexes between β-CD and mPEG derivatives bearing a carboxylic acid function (mPEG–COOH) were synthesized and investigated for their dispersing properties in a cement-based mortar. The formation of mPEG–COOH derivatives and their pseudorotaxanes was investigated by 1D nuclear magnetic resonance, diffusion ordered spectroscopy, and thermogravimetric analysis

ABSTRACT

MC Materiales de Construccin 0465-2746 Consejo Superior de Investigaciones Cientificas MC201830_e172 10.3989/mc.2018.09617 Articles Theoretical and experimental analysis of multifunctional high performance cement mortar matrices reinforced with varying lengths of carbon fibers Anlisis terico y experimental de matrices multifuncionales de mortero de cemento de alta

(PDF) Nano Construction Materials:Review

They propose a new approach to attach CNTs directly on the surface of cement particles in concrete matrix, named as cement hybrid material or CMH. Nasibulin et al. have claimed that the CHM has two times the compressive strength, and 40 times the electrical conductivity of the hardened paste

Development of electrically conductive concrete and

2020/3/2019 Mix designs of electrically concrete and mortars were tested. • Best ECC mix design with graphene had an electrical resistivity under 200 Ω-cm. • ECC mix design with reduced volume of graphite powder and steel fiber. • Effect of water-to-cement ratio and drying

10.1016/jpositesb.2012.02.032

The majority of conductive fillers are metallic fibers (MFs), carbon fiber (CF), carbon black (CB), graphite, or carbon nanotubes (CNTs) [1–7] . Existing research has demonstrated that the conductive fillers can play multiple roles in the intrinsically smart

Marine Civil

These ions may be present as a result of chloride contamination of the concrete materials at the time of placing, or by ingress from external sources such as a marine environment or de-icing salts. The mechanism by which chloride ions disrupt the passive layer is unclear but empirical testing has allowed a threshold contamination level to be defined with a high degree of confidence.

Marine Civil

These ions may be present as a result of chloride contamination of the concrete materials at the time of placing, or by ingress from external sources such as a marine environment or de-icing salts. The mechanism by which chloride ions disrupt the passive layer is unclear but empirical testing has allowed a threshold contamination level to be defined with a high degree of confidence.

Carbon Nanofiber Cement Sensors to Detect Strain and

This can be easily achieved by means of conductive admixtures, such as steel fibers, carbon fibers, graphite powder, graphene, carbon nanofibers (CNFs), or nanotubes (CNTs). Percolation can be defined as the situation where the conductive fibers or particles, randomly dispersed, create a continuous path along the material, which is related to low resistivity values [ 29 ].

IOP Conference Series: Materials Science and Engineering,

The combination of alkali-activated slag matrix with conductive filler introduces new functionalities which are commonly known for self-sensing or self-heating concrete. The present paper discusses the effect of the mixture of two different conductive fillers, graphite powder and carbon nanotubes (CNTs), on the electrical properties of alkali-activated slag mortars.

IOP Conference Series: Materials Science and Engineering,

The combination of alkali-activated slag matrix with conductive filler introduces new functionalities which are commonly known for self-sensing or self-heating concrete. The present paper discusses the effect of the mixture of two different conductive fillers, graphite powder and carbon nanotubes (CNTs), on the electrical properties of alkali-activated slag mortars.

(PDF) A Review of Using Conductive Composite

There are many problems facing aircraft in the air during fl ight, such as lightning strikes and ice accumulation on aircraft surfaces. These problems usually reduce aircraft effi ciency and lead to serious accidents and fatalities. However, the

Nanotechnology Reviews Volume 9 Issue 1

The electrospray deposition method was used to deposit carbon nanotubes (CNT) onto the surfaces of woven carbon fiber (CF) to produce woven hybrid carbon fiber–carbon nanotubes (CF–CNT). Extreme high-resolution field emission scanning electron microscopy (XHR-FESEM), X-ray diffraction (XRD), Raman spectroscopy and Fourier transform infrared spectroscopy (FT-IR) were used to analyze the

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