喷射混凝土水化度的试验与理论模型研究

doi:10.11896/cldb.21030064

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Abstract In this work, shotcrete was taken as the research object, and the relationship between the core temperature rise and the curing age of shotcrete under the adiabatic state was obtained by the adiabatic temperature rise test with different kinds and different amounts of liquid accelerators. By introducing the concept of equivalent age, the relationship between the hydration degree of shotcrete and the equivalent age was calculated, and the influence of environment temperature in adiabatic temperature rise test was eliminated. An improved calculation model of hydration degree of shotcrete was proposed. The effect of accelerator on the early age hydration of shotcrete was considered by introducing the equivalent age acceleration factor. The experimental and theoretical research results show that the hydration process of shotcrete at early age can be significantly improved, whether alkaline or alkali-free accelerator is used. However, the alkali-free accelerator make little difference in the later hydration, while the alkaline accelerator does obviously. After the introduction of equivalent age, the development process of the hydration degree of shotcrete presents a two-stage model, namely the rapid development period and the stable period. The proposed model for calculating the hydration degree of shotcrete fully considers the accelerating effect of accelerator on the early age hydration of shotcrete, especially the more accurate simulation calculation of the early age hydration degree of shotcrete.

Key words： shotcrete degree of hydration calculation model adiabatic temperature rise test accelerator

Published: Online: 2022-12-09

CLC number:

TU528

Fund:National Natural Science Foundation of China(51908550).

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Cite this article:

WANG Jiahe. Experimental and Theoretical Study on Cement Hydration Degree of Shotcrete[J]. Materials Reports, 2022, 36(23): 21030064-5.

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http://www.mater-rep.com/EN/10.11896/cldb.21030064 OR http://www.mater-rep.com/EN/Y2022/V36/I23/21030064

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