Effect of CNTs and MEA on the creep of face-slab concrete at an early age
The creep of face-slab concrete in a rockfill dam is critical for determining the restrained stress and cracking resistance of the concrete at an early age. In this article, the mix proportion of the face-slab concrete for a rockfill dam under construction without any cracking resistance additive wa...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
De Gruyter
2022-07-01
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| Series: | Nanotechnology Reviews |
| Subjects: | |
| Online Access: | https://doi.org/10.1515/ntrev-2022-0145 |
| _version_ | 1811203021052313600 |
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| author | Zhao Zhifang Xiao Cong Fang Bo Lu Yongjiu Shi Tao Zhao Zhigang Gao Xiaofeng |
| author_facet | Zhao Zhifang Xiao Cong Fang Bo Lu Yongjiu Shi Tao Zhao Zhigang Gao Xiaofeng |
| author_sort | Zhao Zhifang |
| collection | DOAJ |
| description | The creep of face-slab concrete in a rockfill dam is critical for determining the restrained stress and cracking resistance of the concrete at an early age. In this article, the mix proportion of the face-slab concrete for a rockfill dam under construction without any cracking resistance additive was taken as the reference concrete (called JC) mix proportion. The carbon nanotubes (CNTs) and magnesium oxide expansion agent (MEA) were incorporated into JC to prepare face-slab concretes called NC and PC, respectively. The temperature–stress tests under temperature matching curing (TMC) and constant temperature curing (CTC) modes were conducted on these three kinds of concretes to investigate the effects of CNTs and MEA on the early-age creep properties of the face-slab concrete under variable stress conditions. The results showed that the creep performance of NC concrete under CTC mode was lower than that under TMC mode. Combined with mercury intrusion porosimetry test results, the mechanism of the effect of CNTs and MEA on creep was analyzed. The results showed that the temperature change may lead to the CNTs debonding from the cementitious matrix or matrix cracking for the NC concrete. The incorporation of CNTs can increase the early-age creep and improve the cracking resistance of concrete. |
| first_indexed | 2024-04-12T02:48:49Z |
| format | Article |
| id | doaj.art-a906ad888c164e55b6ccf06820efa5ab |
| institution | Directory Open Access Journal |
| issn | 2191-9097 |
| language | English |
| last_indexed | 2024-04-12T02:48:49Z |
| publishDate | 2022-07-01 |
| publisher | De Gruyter |
| record_format | Article |
| series | Nanotechnology Reviews |
| spelling | doaj.art-a906ad888c164e55b6ccf06820efa5ab2022-12-22T03:51:05ZengDe GruyterNanotechnology Reviews2191-90972022-07-011112535254610.1515/ntrev-2022-0145Effect of CNTs and MEA on the creep of face-slab concrete at an early ageZhao Zhifang0Xiao Cong1Fang Bo2Lu Yongjiu3Shi Tao4Zhao Zhigang5Gao Xiaofeng6College of Civil Engineering, Zhejiang University of Technology, Hangzhou, 310023, ChinaCollege of Civil Engineering, Zhejiang University of Technology, Hangzhou, 310023, ChinaWuhan Sanyuan Special Building Materials Co., Ltd., Wuhan, 430083, ChinaChina Three Gorges Corporation Test Center, Yichang, 443133, ChinaCollege of Civil Engineering, Zhejiang University of Technology, Hangzhou, 310023, ChinaCollege of Media Engineering, Communication University of Zhejiang, Hangzhou, 310018, ChinaCollege of Civil Engineering, Zhejiang University of Technology, Hangzhou, 310023, ChinaThe creep of face-slab concrete in a rockfill dam is critical for determining the restrained stress and cracking resistance of the concrete at an early age. In this article, the mix proportion of the face-slab concrete for a rockfill dam under construction without any cracking resistance additive was taken as the reference concrete (called JC) mix proportion. The carbon nanotubes (CNTs) and magnesium oxide expansion agent (MEA) were incorporated into JC to prepare face-slab concretes called NC and PC, respectively. The temperature–stress tests under temperature matching curing (TMC) and constant temperature curing (CTC) modes were conducted on these three kinds of concretes to investigate the effects of CNTs and MEA on the early-age creep properties of the face-slab concrete under variable stress conditions. The results showed that the creep performance of NC concrete under CTC mode was lower than that under TMC mode. Combined with mercury intrusion porosimetry test results, the mechanism of the effect of CNTs and MEA on creep was analyzed. The results showed that the temperature change may lead to the CNTs debonding from the cementitious matrix or matrix cracking for the NC concrete. The incorporation of CNTs can increase the early-age creep and improve the cracking resistance of concrete.https://doi.org/10.1515/ntrev-2022-0145creepcarbon nanotubesmagnesium oxide expansion agenttemperature–stress testmulti-scale investigation |
| spellingShingle | Zhao Zhifang Xiao Cong Fang Bo Lu Yongjiu Shi Tao Zhao Zhigang Gao Xiaofeng Effect of CNTs and MEA on the creep of face-slab concrete at an early age Nanotechnology Reviews creep carbon nanotubes magnesium oxide expansion agent temperature–stress test multi-scale investigation |
| title | Effect of CNTs and MEA on the creep of face-slab concrete at an early age |
| title_full | Effect of CNTs and MEA on the creep of face-slab concrete at an early age |
| title_fullStr | Effect of CNTs and MEA on the creep of face-slab concrete at an early age |
| title_full_unstemmed | Effect of CNTs and MEA on the creep of face-slab concrete at an early age |
| title_short | Effect of CNTs and MEA on the creep of face-slab concrete at an early age |
| title_sort | effect of cnts and mea on the creep of face slab concrete at an early age |
| topic | creep carbon nanotubes magnesium oxide expansion agent temperature–stress test multi-scale investigation |
| url | https://doi.org/10.1515/ntrev-2022-0145 |
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