Preparation and Performance of a New-Type Alkali-Free Liquid Accelerator for Shotcrete
Joint Authors
Fang, Jianhong
Sheng, Yanping
Xue, Bin
Li, Haibin
Qiao, Yunyan
Chen, Huaxin
Xu, Anhua
Source
Advances in Materials Science and Engineering
Issue
Vol. 2017, Issue 2017 (31 Dec. 2017), pp.1-9, 9 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2017-05-17
Country of Publication
Egypt
No. of Pages
9
Abstract EN
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.
American Psychological Association (APA)
Sheng, Yanping& Xue, Bin& Li, Haibin& Qiao, Yunyan& Chen, Huaxin& Fang, Jianhong…[et al.]. 2017. Preparation and Performance of a New-Type Alkali-Free Liquid Accelerator for Shotcrete. Advances in Materials Science and Engineering،Vol. 2017, no. 2017, pp.1-9.
https://search.emarefa.net/detail/BIM-1123519
Modern Language Association (MLA)
Sheng, Yanping…[et al.]. Preparation and Performance of a New-Type Alkali-Free Liquid Accelerator for Shotcrete. Advances in Materials Science and Engineering No. 2017 (2017), pp.1-9.
https://search.emarefa.net/detail/BIM-1123519
American Medical Association (AMA)
Sheng, Yanping& Xue, Bin& Li, Haibin& Qiao, Yunyan& Chen, Huaxin& Fang, Jianhong…[et al.]. Preparation and Performance of a New-Type Alkali-Free Liquid Accelerator for Shotcrete. Advances in Materials Science and Engineering. 2017. Vol. 2017, no. 2017, pp.1-9.
https://search.emarefa.net/detail/BIM-1123519
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1123519