Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 207, Issue -, Pages 329-337Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2019.02.125
Keywords
Surrounding rock temperature; High-temperature geothermal tunnel; Hot-dry environment; Concrete for shotcrete use; Mechanical property; Pore structure; Fractal dimension
Categories
Funding
- National Natural Science Foundation of China [51678492]
- Sichuan Province Science and Technology Project [2018FZ0095, 2019YFG0258]
- Doctoral Innovation Fund Program of Southwest Jiaotong University
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In view of the temperature distribution of the high-temperature geothermal tunnels, the surrounding rock temperature was divided into four grades (40 degrees C, 60 degrees C, 80 degrees C and 100 degrees C) to simulate the hot-dry environment. Using the standard curing environment as a reference condition, the mechanical properties and pore structure characteristics of concrete for shotcrete use under hot-dry environments at different temperatures were studied by mechanical and mercury intrusion porosimetry (MIP) tests. Fractal dimension of pore structure was calculated through the fractal model based on thermodynamic method. Bivariate correlation analysis was conducted on the curing temperature and the pore structure parameters. The results show that the 40 degrees C hot-dry environment is conducive to enhance the mechanical properties of concrete and optimize its pore structure at the age of Id. However, the hot-dry environments after 7 days will deteriorate the mechanical properties and pore structure of concrete, and the higher the temperature, the more obvious the deterioration. There is a significant correlation between curing temperature and porosity of capillary pores, median pore diameter, average pore diameter and fractal dimension. (C) 2019 Elsevier Ltd. All rights reserved.
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