Microscopic Damage to Limestone under Acidic Conditions: Phenomena and Mechanisms

Xingming Chen, Xiaoping Liu, Haoming Luo, Linjian Long and Chuanju Liu ()
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Xingming Chen: School of Environment and Resources, Southwest University of Science and Technology, Mianyang 621010, China
Xiaoping Liu: School of Environment and Resources, Southwest University of Science and Technology, Mianyang 621010, China
Haoming Luo: School of Environment and Resources, Southwest University of Science and Technology, Mianyang 621010, China
Linjian Long: School of Environment and Resources, Southwest University of Science and Technology, Mianyang 621010, China
Chuanju Liu: School of Environment and Resources, Southwest University of Science and Technology, Mianyang 621010, China

Sustainability, 2022, vol. 14, issue 18, 1-12

Abstract: In an acidic environment, the mineral components in rock begin to break down. As a result, the microstructure will be damaged, and then the mechanical properties will deteriorate, which will eventually have a negative effect on engineering stability. In order to study acid damage’s effect on this kind of rock, limestone samples were acidified for 0 days, 5 days, 10 days, 15 days, and 20 days. The microstructure changes in the limestone after acidification were studied via the wave velocity test and electron microscope scanning, and the damage deterioration mechanism was revealed. The results show that the acoustic signal of acidified samples has an obvious absorption effect at high frequency, and the surface pore structure of acidified samples shows fractal characteristics. The P-wave velocity, main peak amplitude, and fractal dimension of the acidified samples did not gradually decrease with time; however, there was a short-term strengthening phenomenon during immersion, which was mainly caused by the formation of CaSO 4 crystals.

Keywords: acidic conditions; acoustic frequency domain; SEM; fractal dimension; microscopic damage (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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