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Microscopic characterization of microcrack development in marble after cyclic treatment with high temperature

  • Jun Peng
  • Guan RongEmail author
  • Zhicheng Tang
  • Song Sha
Original Paper
  • 30 Downloads

Abstract

Crack density of rocks is greatly affected by high temperature treatment and the induced thermal damage influences the strength and deformation characteristics of the rock. A good understanding of thermal cracking behavior is useful for geological evaluation of engineering structures associated with high temperature problems. This study investigates the characteristics of thermally-induced microcracks in a fine-grained dolomitic marble with different degrees of thermal damage using an optical microscope. Different degrees of thermal damage were first generated by treating the rock specimen with different heating and cooling cycles. Optical microscopy was then used to characterize the microcrack type and statistically examine the width, length, and anisotropy of thermally-induced microcracks. The results reveal that most of the generated microcracks induced by cyclic high temperature treatment are grain boundary microcracks. The width and length of microcracks significantly increases with an increasing number of heating and cooling cycles. It is also found that both grain boundary microcracks and intra-grain microcracks do not show predominant direction after thermal treatment. Finally, a quantitative relation is established to correlate the mechanical behavior of rocks (i.e., strength and modulus) with the crack density. The proposed relation is useful in understanding how the microstructure affects the properties of rocks after treatment with high temperature.

Keywords

Heating and cooling cycle Thermally-induced microcrack Microscopic observation Crack density Anisotropy 

Notes

Acknowledgements

The research work presented in this paper is in part supported by the National Natural Science Foundation of China (Grant nos. 51609178, 51579189, and 41772305), the Nature Science Foundation of Hubei Province (Grant no. 2018CFB593), the China Postdoctoral Science Foundation (Grant nos. 2015M582273 and 2018T110800), and the Open-end Research Fund of the State Key Laboratory for Geomechanics and Deep Underground Engineering (Grant no. SKLGDUEK1709). The authors are grateful to these financial supporters.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.State Key Laboratory of Water Resources and Hydropower Engineering ScienceWuhan UniversityWuhanChina
  2. 2.School of Civil EngineeringWuhan UniversityWuhanChina
  3. 3.Faculty of EngineeringChina University of GeosciencesWuhanChina

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