文章基本信息

标题：Microscopic Damage to Limestone under Acidic Conditions: Phenomena and Mechanisms
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作者：Chen, Xingming ; Liu, Xiaoping ; Luo, Haoming 等
期刊名称：Sustainability
印刷版ISSN：2071-1050
出版年度：2022
卷号：14
期号：18
页码：1-12
DOI：10.3390/su141811771
语种：English
出版社：MDPI, Open Access Journal
摘要：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 CaSO4 crystals.
关键词：acidic conditions; acoustic frequency domain; SEM; fractal dimension; microscopic damage