期刊
COMPOSITE STRUCTURES
卷 256, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compstruct.2020.113104
关键词
Cyclic heating; Carbon nanotube; Cement composite; Compressive strength; Microstructure
资金
- National Research Foundation of Korea (NRF) - Korean government (MSIT) [2020R1A2C2008926]
- Korean Institute of Energy Technology Evaluation and Planning (KETEP)
- Ministry of Trade, Industry & Energy (MOTIE) of the Republic of Korea [20181110200070]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20181110200070] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2020R1A2C2008926] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The study found that with the increase of CNT dosage, the temperature of the specimens also increased, but more heating cycles may lead to a decrease in heating performance. This is likely attributed to the occurrence of microcracks caused by different thermal expansion coefficients, and the additional hydrates generated by the increased temperature of the specimens.
The heating performance of cement composites can be improved by adding carbon nanotubes (CNTs); however, cyclic heating by CNTs can reduce the heating and mechanical properties of CNT-reinforced cement composite in the long term. This study investigated the cyclic heating and mechanical properties before and after the heating of CNT-reinforced cement composites. Paste specimens were fabricated using the 0.1-0.5 wt% con tent of CNT as the major variable, and a cyclic heating experiment was performed for applied voltages of 50 and 100 V. The compressive strength before and after cyclic heating were measured and compared. In addition, microstructural changes of the CNT-reinforced cement composite after cyclic heating was evaluated by thermogravimetric analysis, mercury intrusion porosimetry, and scanning electron microscopy. As the dosage of CNT increased, the temperature of the specimen increased, and as the heating cycle increased, the heating performance tended to decrease. This seems to be attributed to the occurrence of microcracks by the different thermal expansion coefficients, and by the additional hydrates generated by the increased temperature of the specimen.
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