Effect of adding carbon nanotubes on the thermal conductivity of steel fiber-reinforced concrete

Hassanzadeh-Aghdam, Mohammad Kazem; Mahmoodi, Mohammad Javad; Safi, Mohammad

doi:10.1016/j.compositesb.2019.106972

Cited by 59 publications

(13 citation statements)

References 67 publications

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“…However, specimens with CNTs owned higher thermal conductivity than that of control specimens regardless of the heating level. This finding agrees with other results reported in [ 29 ] and could be ascribed to: (1) The well distribution of the CNTs, which owned higher conductivity than cement paste [ 29 ], through the hydration products; (2) The filling effect of the CNTs, which reduced the voids, thus enhancing the microstructure of the mortar.…”

Section: Resultssupporting

confidence: 92%

Section: Thermal Conductivitysupporting

confidence: 93%

“…In addition, presence of CNTs increased the area of the first peak which reflected higher heat absorption. These results might be ascribed to the fact that specimens with CNTs contained more free water than plain mortar due to the water absorbed by the CNTs [28], and that these specimens had higher amounts of CSH [29] which supported the XRD results mentioned in the previous section. Heating the specimens at 200 • C did not change the numbers and the location of the observed peaks.…”

Section: Heat Flow Analysis Using Dscsupporting

confidence: 85%

“…These results agree with the above-mentioned DSC results. A stiff slope was recognised for specimens with CNTs below 120 °C, indicating more dehydration of pore water [ 29 ]. In addition, the presence of CNTs increased the weight loss at 85 °C, which referred to a greater amount of calcium silicates hydrates.…”

Section: Resultsmentioning

confidence: 99%

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Influence of Carbon Nanotubes on Phase Composition, Thermal and Post-Heating Behavior of Cementitious Composites

2021

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This paper experimentally investigates the influence of carbon nanotubes (CNTs) on phase composition, microstructure deterioration, thermal behavior, and residual mechanical strengths of cementitious composites exposed to elevated temperatures. Cement mortars with small dosages of CNTs, 0.05% and 0.2% by weight of cement, were prepared and then heated at 25 °C, 150 °C, 200 °C, 450 °C, and 600 °C for two hours before being tested. The results show positive impact of the CNTs on the hydration process of cement mortar at room temperature and at higher temperatures up to 200 °C. Decomposition of the hydration products is obvious at 450 °C, whereas sever deterioration in the microstructure occurs at 600 °C. The nano reinforcement and bridging effect of the CNTs are obvious up to 450 °C. Thermal behavior characterization shows that CNTs incorporation enhances the thermal conductivity of the unheated and heat-treated mortar specimens. The decomposition of the hydration products needs more heat in the presence of CNTs. Finally, presence of CNTs significantly enhances the residual compressive and flexural strengths of heated mortar specimens for all studied temperatures.

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Section: Resultssupporting

confidence: 92%

Section: Thermal Conductivitysupporting

confidence: 93%

Section: Heat Flow Analysis Using Dscsupporting

confidence: 85%

Section: Resultsmentioning

confidence: 99%

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Influence of Carbon Nanotubes on Phase Composition, Thermal and Post-Heating Behavior of Cementitious Composites

2021

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“…Regarding concrete with low thermal conductivity, some experimental studies have been performed [6][7][8][9][10][11]. Aghdam et al [6] performed an experimental study to estimate the effects of carbon nanotubes on the thermal conductivity of steel fiber-reinforced concrete. The test results show that the addition and the increasing length of the carbon nanotubes significantly improved the thermal conductivity of steel fiber-reinforced concrete.…”

Section: Introductionmentioning

confidence: 99%

A Study on the Thermal Properties of High-Strength Concrete Containing CBA Fine Aggregates

Yang

Park

2020

Materials

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The thermal conductivity of concrete is a key factor for efficient energy consumption in concrete buildings because thermal conductivity plays a significant role in heat transfer through concrete walls. This study investigated the effects of replacing fine aggregates with coal bottom ash (CBA) and the influence of curing age on the thermal properties of high-strength concrete with a compressive strength exceeding 60 MPa. The different CBA aggregate contents included 25%, 50%, 75%, and 100%, and different curing ages included 28 and 56 days. For concrete containing CBA fine aggregate, the thermal and mechanical properties, including the unit weight, thermal conductivity, compressive strength, and ultrasonic velocity, were measured. The experimental results reveal that the unit weight and thermal conductivity of the CBA concrete were highly dependent on the CBA content. The unit weight, thermal conductivity, and compressive strength of the concrete decreased as the CBA content increased. Relationships between the thermal conductivity and the unit weight, thermal conductivity and compressive strength of the CBA concrete were proposed in the form of exponential functions. The equations proposed in this study provided predictions that were in good agreement with the test results. In addition, the test results show that there was an approximately linear relationship between the thermal conductivity and ultrasonic velocity of the CBA concrete.

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Assessment of Thermal Conductivity of Mortar with a Novel Carbon Based Nano-material

Alexa-Stratulat,

Covatariu,

Toma

et al. 2024

Springer Series in Geomechanics and Geoengineering

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Effect of adding carbon nanotubes on the thermal conductivity of steel fiber-reinforced concrete

Cited by 59 publications

References 67 publications

Influence of Carbon Nanotubes on Phase Composition, Thermal and Post-Heating Behavior of Cementitious Composites

Influence of Carbon Nanotubes on Phase Composition, Thermal and Post-Heating Behavior of Cementitious Composites

A Study on the Thermal Properties of High-Strength Concrete Containing CBA Fine Aggregates

Assessment of Thermal Conductivity of Mortar with a Novel Carbon Based Nano-material

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