Acid solution decreases the compressional wave velocity of sandstone from the Yungang Grottoes, Datong, China View Full Text


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Article Info

DATE

2019-12

AUTHORS

Hong Geng, Shijie Zhang, Jianhui Zhi, Runping Zhang, Jianguang Ren, Chul-Un Ro

ABSTRACT

To understand the effects of an acidic environment on the internal structure of sandstone from the Yungang Grottoes, Datong, China, the physicochemical properties of fresh and weathered sandstone samples and their compressional wave (P-wave) velocities in response to different concentrations of H2SO4 and HNO3 solution were investigated. X-ray diffraction (XRD) and a scanning electron microscope equipped with energy dispersive X-ray spectrometer (SEM–EDX) were used to determine grain morphology and chemical composition. The results show that the sandstone, which mainly consists of silicon dioxide and calcium carbonate, became more complicated in composition after weathering. A nonmetallic ultrasonic detector was used to measure the P-wave velocities of sandstones in a natural state and soaked with ultrapure water and with H2SO4 and HNO3 at concentrations of 0.2 mol L−1, 0.4 mol L−1, and 0.8 mol L−1, respectively. For the acid-treated groups, with increasing acidity, P-wave velocity decreased significantly, compressive strength decreased and effective porosity increased; these behaviours are different from those of the water-treat group, implying that the acid solutions damaged the microstructure of the sandstone. The results suggest that the deterioration risk of H2SO4 and HNO3, or sulfates and nitrates converted from ambient SO2, NOx and PM2.5, on the stone relics in the Yungang Grottoes should be a cause for concern. More... »

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4

References to SciGraph publications

  • 2015-07. Correlation Between P-Wave Velocity and Physical–Mechanical Properties of Intensely Jointed Dolostones, Peloritani Mounts, NE Sicily in ROCK MECHANICS AND ROCK ENGINEERING
  • 2016-11. Experimental Weathering of Weak Sandstone Without Direct Water Participation by Using Sandstone from the Yungang Grottoes in Datong, China in ROCK MECHANICS AND ROCK ENGINEERING
  • 2013-09. Empirical Correlations for Predicting Strength Properties of Rocks from P-Wave Velocity Under Different Degrees of Saturation in ROCK MECHANICS AND ROCK ENGINEERING
  • 2014-10. Variable temperature and moisture conditions in Yungang Grottoes, China, and their impacts on ancient sculptures in ENVIRONMENTAL EARTH SCIENCES
  • 2001-06. Soils and waves:Particulate materials behavior, characterization and process monitoring in JOURNAL OF SOILS AND SEDIMENTS
  • 2019-01. Effect of Water on Long-Term Strength of Column Rocks Based on Creep Behavior in Yungang Grottoes, China in GEOTECHNICAL AND GEOLOGICAL ENGINEERING
  • 2015-03. Investigation into rock moisture and salinity regimes: implications of sandstone weathering in Yungang Grottoes, China in CARBONATES AND EVAPORITES
  • 2009-03. Experimental study on interaction between simulated sandstone and acidic fluid in PETROLEUM SCIENCE
  • 2018-12. A synthetic approach to weathering degree classification of stone relics case study of the Yungang Grottoes in HERITAGE SCIENCE
  • 2015-03. Salt transport and weathering processes in a sandstone cultural relic, North China in CARBONATES AND EVAPORITES
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    http://scigraph.springernature.com/pub.10.1186/s40494-019-0245-2

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