id	author	title	date	pages	extension	mime	words	sentences	flesch	summary	cache	txt
cord-343418-519vkzci	Li, Hao	Study on the Performance Degradation of Sandstone under Acidification	2020-10-21		.txt	text/plain	3993	210	52	X-ray diffraction qualitative analysis of the composition and concentration of ions shows that the formation of white precipitates is citric acid and Mg promotes the conversion of amorphous calcium carbonate to high-crystallinity calcite, forming a white precipitate. Due to the influence of the Corona Virus Disease 2019 (COVID-19), the research period was extended to 93 days, and it was unexpectedly concluded that the citric acid action promoted the precipitation of regular carbonate in the sandstone, resulting in calcium crystals, and an experimental analysis of the reasons for precipitation. Group 5 shows a relatively high ion content, indicating that hydrochloric acid and acetic acid both react with minerals in the sandstone, although the cores used in groups 4 and 7 are the most damaged due to the formation of precipitated substances by weak acids.	./cache/cord-343418-519vkzci.txt	./txt/cord-343418-519vkzci.txt