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.
作者简介: 王家赫,中国铁道科学研究院集团有限公司铁道建筑研究所副研究员。2018年清华大学土木工程系博士毕业工作至今。主持国家自然科学基金项目等科研项目3项。目前主要从事混凝土材料、胶凝材料水化机理等方面的研究工作。发表论文30余篇,包括Cement and Concrete Composites、Construction and Building Materials、Drying Technology、Magazine of Concrete Research等。
引用本文:
王家赫. 喷射混凝土水化度的试验与理论模型研究[J]. 材料导报, 2022, 36(23): 21030064-5.
WANG Jiahe. Experimental and Theoretical Study on Cement Hydration Degree of Shotcrete. Materials Reports, 2022, 36(23): 21030064-5.
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2022, Vol. 36 
