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Advances in Concrete Construction Volume 12, Number 5, November 2021 , pages 439-450 DOI: https://doi.org/10.12989/acc.2021.12.5.439 |
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Effects of multi-walled carbon nanotubes on the hydration heat properties of cement composites |
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Sung-Jin Ha, Rajagopalan Sam Rajadurai and Su-Tae Kang
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| Abstract | ||
| In recent years, nano-reinforcing materials are widely utilized in cement composites due to their unique multifunctional properties. This study incorporated multi-walled carbon nanotubes (MWCNTs) into the cementitious composites at ratios of 0.1%, 0.3%, and 0.5%, and investigated their influence on the flowability, mechanical strength, and hydration heat properties. The addition of MWCNTs enhanced the compressive and split tensile strengths approximately by 18-51%. In the semi-adiabatic temperature rise test, the internal hydration heat of the composites reduced by 5%, 9%, and 12% with the increase of MWCNTs in 0.1%, 0.3%, and 0.5%. This study further performed hydration heat analysis and estimated the adiabatic temperature rise, thermal stress, and thermal crack index. The internal hydration heat of the concrete decreased by 5%, 10%, and 13% with the increase of MWCNTs. The thermal stress of the concrete decreased with increase in the addition of MWCNTs, and the obtained temperature crack index was effective in controlling the thermal cracks. | ||
| Key Words | ||
| carbon nanotubes; hydration heat; semi-adiabatic temperature rise test; thermal crack; thermal stress | ||
| Address | ||
| Sung-Jin Ha: Office of Water Works, Yeongcheon City Hall, Yeongcheon 38819, Korea Rajagopalan Sam Rajadurai: Department of Civil Engineering, Daegu University, Gyeongsan 38453, Korea Su-Tae Kang: Department of Civil Engineering, Daegu University, Gyeongsan 38453, Korea | ||
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