Preparation and Performance of a New-Type Alkali-Free Liquid Accelerator for Shotcrete
A new type of alkali-free liquid accelerator for shotcrete was prepared. Specifically, the setting time and strength and shrinkage performance of two kinds of Portland cement with the accelerator were fully investigated. Moreover, the accelerating mechanism of alkali-free liquid accelerator and the...
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| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2017-01-01
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| Series: | Advances in Materials Science and Engineering |
| Online Access: | http://dx.doi.org/10.1155/2017/1264590 |
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| _version_ | 1850223010236071936 |
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| author | Yanping Sheng Bin Xue Haibin Li Yunyan Qiao Huaxin Chen Jianhong Fang Anhua Xu |
| author_facet | Yanping Sheng Bin Xue Haibin Li Yunyan Qiao Huaxin Chen Jianhong Fang Anhua Xu |
| author_sort | Yanping Sheng |
| collection | DOAJ |
| description | A new type of alkali-free liquid accelerator for shotcrete was prepared. Specifically, the setting time and strength and shrinkage performance of two kinds of Portland cement with the accelerator were fully investigated. Moreover, the accelerating mechanism of alkali-free liquid accelerator and the hydration process of the shotcrete with accelerator were explored. Results show that alkali-free liquid accelerator significantly shortened the setting time of cement paste, where the initial setting time of cement paste with 8 wt% of the accelerator was about 3 min and the final setting time was about 7 min. Compressive strength at 1 day of cement mortar with the accelerator could reach 23.4 MPa, which increased by 36.2% compared to the strength of cement mortar without the accelerator, and the retention rate of 28-day compressive strength reached 110%. In addition, the accelerator still shows a good accelerating effect under low temperature conditions. However, the shrinkage rate of the concrete increased with the amount of the accelerator. 5~8% content of accelerator is recommended for shotcrete in practice. XRD and SEM test results showed that the alkali-free liquid accelerator promoted the formation of ettringite crystals due to the increase of Al3+ and SO42- concentration. |
| format | Article |
| id | doaj-art-6b8aa9614ae44a3ea3241ec7bdca1f5e |
| institution | OA Journals |
| issn | 1687-8434 1687-8442 |
| language | English |
| publishDate | 2017-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Materials Science and Engineering |
| spelling | doaj-art-6b8aa9614ae44a3ea3241ec7bdca1f5e2025-08-20T02:06:07ZengWileyAdvances in Materials Science and Engineering1687-84341687-84422017-01-01201710.1155/2017/12645901264590Preparation and Performance of a New-Type Alkali-Free Liquid Accelerator for ShotcreteYanping Sheng0Bin Xue1Haibin Li2Yunyan Qiao3Huaxin Chen4Jianhong Fang5Anhua Xu6School of Materials Science and Engineering, Chang’an University, Xi’an 710064, ChinaSchool of Highway, Chang’an University, Xi’an 710064, ChinaCollege of Architecture and Civil Engineering, Xi’an University of Science and Technology, Xi’an 710054, ChinaSchool of Materials Science and Engineering, Chang’an University, Xi’an 710064, ChinaSchool of Materials Science and Engineering, Chang’an University, Xi’an 710064, ChinaQinghai Research Institute of Transportation, Xining 810008, ChinaQinghai Research Institute of Transportation, Xining 810008, ChinaA new type of alkali-free liquid accelerator for shotcrete was prepared. Specifically, the setting time and strength and shrinkage performance of two kinds of Portland cement with the accelerator were fully investigated. Moreover, the accelerating mechanism of alkali-free liquid accelerator and the hydration process of the shotcrete with accelerator were explored. Results show that alkali-free liquid accelerator significantly shortened the setting time of cement paste, where the initial setting time of cement paste with 8 wt% of the accelerator was about 3 min and the final setting time was about 7 min. Compressive strength at 1 day of cement mortar with the accelerator could reach 23.4 MPa, which increased by 36.2% compared to the strength of cement mortar without the accelerator, and the retention rate of 28-day compressive strength reached 110%. In addition, the accelerator still shows a good accelerating effect under low temperature conditions. However, the shrinkage rate of the concrete increased with the amount of the accelerator. 5~8% content of accelerator is recommended for shotcrete in practice. XRD and SEM test results showed that the alkali-free liquid accelerator promoted the formation of ettringite crystals due to the increase of Al3+ and SO42- concentration.http://dx.doi.org/10.1155/2017/1264590 |
| spellingShingle | Yanping Sheng Bin Xue Haibin Li Yunyan Qiao Huaxin Chen Jianhong Fang Anhua Xu Preparation and Performance of a New-Type Alkali-Free Liquid Accelerator for Shotcrete Advances in Materials Science and Engineering |
| title | Preparation and Performance of a New-Type Alkali-Free Liquid Accelerator for Shotcrete |
| title_full | Preparation and Performance of a New-Type Alkali-Free Liquid Accelerator for Shotcrete |
| title_fullStr | Preparation and Performance of a New-Type Alkali-Free Liquid Accelerator for Shotcrete |
| title_full_unstemmed | Preparation and Performance of a New-Type Alkali-Free Liquid Accelerator for Shotcrete |
| title_short | Preparation and Performance of a New-Type Alkali-Free Liquid Accelerator for Shotcrete |
| title_sort | preparation and performance of a new type alkali free liquid accelerator for shotcrete |
| url | http://dx.doi.org/10.1155/2017/1264590 |
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