Compatibility of carbon nanotubes in concrete with air entrainer and superplasticizer

Sun, Zhe; Wan, Zhe; Sachs, Steven G.

doi:10.1016/j.conbuildmat.2022.129944

Cited by 3 publications

(2 citation statements)

References 44 publications

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“…All samples exhibited a flow test result higher than 100 cm; nevertheless, mixtures containing CNT as an admixture displayed slightly improved flowability compared to the control mixture. This enhancement may be attributed to the effective dispersion of CNTs, which can enhance concrete flowability by acting as a lubricating agent [ 56 ]. This reduces internal friction among particles, facilitating smoother flow in the concrete mix.…”

Section: Resultsmentioning

confidence: 99%

“…In each sample, O, Si, C, and Ca remained the primary elements, in line with the EDS map spectrum results. However, there is a slight increase in the percentage of C with the escalation of CNT content as an admixture [ 47 , 56 ]. These outcomes are consistent with the findings of XRD analysis, where quartz and hatrurite persist as the principal crystalline phases in the structure of all mixtures.…”

Section: Resultsmentioning

confidence: 99%

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Effect of Carbon Nanotubes on Chloride Diffusion, Strength, and Microstructure of Ultra-High Performance Concrete

Rafieizonooz,

Kim,

Kim

et al. 2024

Materials

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This study delved into the integration of carbon nanotubes (CNTs) in Ultra-High Performance Concrete (UHPC), exploring aspects such as mechanical properties, microstructure analysis, accelerated chloride penetration, and life service prediction. A dispersed CNT solution (0.025 to 0.075 wt%) was employed, along with a superplasticizer, to ensure high flowability in the UHPC slurry. In addition, the combination of high-strength functional artificial lightweight aggregate (ALA) and micro hollow spheres (MHS) was utilized as a replacement for fine aggregate to not only reduce the weight of the concrete but also to increase its mechanical performance. Experimental findings unveiled that an increased concentration of CNT in CNT1 (0.025%) and CNT2 (0.05%) blends led to a marginal improvement in compressive strength compared to the control mix. Conversely, the CNT3 (0.075%) mixture exhibited a reduction in compressive strength with a rising CNT content as an admixture. SEM analysis depicted that the heightened concentration of CNTs as an admixture induced the formation of nanoscale bridges within the concrete matrix. Ponding test results indicated that, for all samples, the effective chloride transport coefficient remained below the standard limitation of 1.00 × 10−12 m2/s, signifying acceptable performance in the ponding test for all samples. The life service prediction outcomes affirmed that, across various environmental scenarios, CNT1 and CNT2 mixtures consistently demonstrated superior performance compared to all other mixtures.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%