| Issue |
MATEC Web Conf.
Volume 319, 2020
2020 8th Asia Conference on Mechanical and Materials Engineering (ACMME 2020)
|
|
|---|---|---|
| Article Number | 08003 | |
| Number of page(s) | 4 | |
| Section | Concrete Technology | |
| DOI | https://doi.org/10.1051/matecconf/202031908003 | |
| Published online | 10 September 2020 | |
Research on application of high performance alkali-free liquid accelerator in shotcrete support
1
School of Transportation and Civil Engineering, Shandong Jiaotong University, Jinan, Shandong 250357, China
2
The second construction limited company of china construction eighth engineering division, Jinan, Shandong 250001, China
* Corresponding author: 2473038977@qq.com
At present, sprayed concrete has problems such as low strength, large rebound amount, and high dust concentration. Developed a new type of alkali-free liquid accelerator, which can effectively improve the performance of shotcrete. The alkali-free liquid accelerator is mainly composed of aluminum sulfate, active aluminum hydroxide, alcohol amine, amide, and stabilizer. Through laboratory tests and field tests, when the alkali-free liquid accelerator admixture is 5% to 7%, the initial setting time is within 5 minutes, and the final setting time is within 10 minutes. The strength of shotcrete reaches 12.8MPa in one day, and the compressive strength ratio of 28d is more than 95.3%, and the rebound amount is within 10%. Compared with ordinary alkali-free liquid accelerator and alkaline liquid accelerator, the strength of sprayed concrete mixed with the alkali-free liquid accelerator is greatly improved, which is more conducive to the support of the sprayed layer, reduced rebound and dust, effectively improve the construction environment and increase construction efficiency.
© The Authors, published by EDP Sciences, 2020
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