Heat Behavior of Electrically Conductive Concretes with and without Rebar Reinforcement

Abstract

Lately, electrically conductive concrete (ECC) is being investigated to prevent accumulation of snow and ice. The conductivity of electrical conductive concretes containing steel fiber is reduced by the corrosion of the steel fiber in time. Therefore, it is proposed to produce electrical conductive concretes that does not contain steel fibers recently. In this study, it is aimed to examine rebars in electrical conductive concretes non containing steel fiber. For this, 45 ´ 45 ´ 5 cm ECC slabs with and without Փ10 rebars were produced. Carbon fiber was used as a single fiber type in the mixtures. The heating times and thermal behaviors of the slab specimens were examined in a cooler at about – 10 °C. According to the results, the temperature in the rebars reinforced specimens has increased first in the regions near the electrodes and then proceeds towards the middle of the specimen. In non-rebars specimens, temperature rise has started from random points.

Characterization of carbon fiber reinforced conductive mortars filled with recycled ferrochrome slag aggregates

“…In these studies, the four-probe technique or other superficial test techniques are used as the measurement method. Since the resistivity measurement reason in the current study was to specify the bulk conductivity of the samples, the two-point uniaxial measurement method, which is also frequently used in the literature [21,28], was preferred. A potential difference of 40 volts was applied to all samples for resistivity measurement.…”

“…While the electrical resistivity of outdoor dried concrete was determined as 6.54 X 10 5 -11.4 X 10 5 Ω.cm, the electrical resistivity of saturated concrete and dry concrete were determined to be 10 6 Ω.cm and 10 9 Ω.cm, respectively [21]. The specification of a conductivity class for concretes may vary for different purposes.…”

“…It has been confirmed by different studies that the electrical resistance of concrete is at high levels. While the electrical resistivity of outdoor dried concrete was determined as 6.54 X 10 5 -11.4 X 10 5 Ω.cm, the electrical resistivity of saturated concrete and dry concrete were determined to be 10 6 Ω.cm and 10 9 Ω.cm, respectively [21]. There are various studies on the mechanical behavior of CF reinforced conductive concrete exposed to different loads such as pressure and bending [22].…”

Influence of Sulphate Attack on Properties of Modified Cement Composites

“…The use of electrolytic additives effects the structure formation, and changes the dispersion, quantity, and shape of hydrates [33][34][35]. In a number of studies [36,37], it was found that the use of an electrolyte such as calcium nitrate reduces the degree of structure crystallization of concrete in the long term due to the interaction of nitric acid salt with aluminum-containing phases of Portland cement forming calcium hydronitroaluminates and calcium hydroxynitrates.…”

The Icing Distribution Characteristics Research of Tower Cross Beam of Long-Span Bridge by Numerical Simulation

“…Conductive concrete methods are to mix the appropriate amount of steel fiber [10], carbon fiber [11,12] or graphene into concrete [13]; in this way, the concrete can have a certain electrical resistance so that the concrete can produce heat to melt ice and snow after being electrified. However, the doped materials are prone to corrosion in concrete, resulting in the decrease of electrical and thermal efficiency [14].…”