Hydration Absorption and Thermal Effects of Outcrop Porous Sandstone Based on Intelligent Experimental and Infrared Thermography Techniques

Nai Hao, Yongliang Wang (), Hao Cheng, Xiaochong Wu and Yi Zhao
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Nai Hao: State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
Yongliang Wang: School of Mechanics and Civil Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
Hao Cheng: School of Mechanics and Civil Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
Xiaochong Wu: School of Mechanics and Civil Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
Yi Zhao: School of Mechanics and Civil Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China

Energies, 2023, vol. 16, issue 22, 1-26

Abstract: Sandstones are enriched in deep energy reservoirs and also exist as outcrop rocks, where the pore characteristics of sandstone are influenced by hydration absorption and thermal effects. To study the influence of the initial temperature on the hydration absorption characteristics of outcrop porous sandstone in the Mogao Grottoes, China, an intelligent experimental device for rock hydration was used. The hydration absorption characteristics and temperature effects of sandstone were analyzed by using infrared thermography techniques to monitor the infrared radiation characteristics of the sandstone’s surface during hydration absorption. The experimental results show that the higher the initial temperature of the rock samples, the shorter the time it takes for the sandstone to absorb enough water to reach saturation. The temperature variation of sandstone with different initial temperatures was also determined; the variation in the hydration absorption of sandstone conforms to certain rules, which can be expressed by formulae containing certain parameters. The changing trend of hydration absorption in outcrop porous sandstone shows that the hydration absorption increases rapidly at first, and then the rate of increase slows down until the hydration absorption remains unchanged after saturation. The experimental technique and method provide feasible means and techniques to evaluate the hydration absorption and thermal effects of outcrop porous sandstone, for further detecting the weathering degree of rock grottoes and revealing the damage mechanisms.

Keywords: hydration absorption; thermal effects; outcrop porous sandstone; intelligent experimental and infrared thermography techniques; sandstone (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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