Macroscopic and microscopic trans-scale characteristics of pore structure of mine grouting materials

Hu, J.-h., Ren, Q.-f., Ma, S.-w., Jian, Q., Jiang, Y.-j., Shang, J.-l. and Luo, Z.-q. (2019) Macroscopic and microscopic trans-scale characteristics of pore structure of mine grouting materials. Transactions of Nonferrous Metals Society of China, 29(5), pp. 1067-1081. (doi: 10.1016/S1003-6326(19)65015-6)

Abstract

The pore structure and porosity of three kinds of mine grouting materials were characterized based on a thin-section analysis and low-field nuclear magnetic resonance (NMR) technique. The macroscopic pore interconnectivity was investigated using binary images captured from thin sections and a random walk pore spectral dimension (RWPSD) algorithm. The experimental results show that the microstructure of the grouting materials used consisted of interlayer pores, gel pores, capillary pores, circular air holes, and small fractures, and tailings can fill some gaps in the hydration product structure and dense hydration products. There is a positive correlation between pore interconnectivity and curing time. In addition, there is a relationship between pore interconnectivity and porosity. With increasing porosity and pore interconnectivity, a non-uniform pore structure occurs in mine grouting materials with an accelerator and results in reduced setting time and later strength.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Shang, Dr Junlong
• Authors: Hu, J.-h., Ren, Q.-f., Ma, S.-w., Jian, Q., Jiang, Y.-j., Shang, J.-l., and Luo, Z.-q.
• College/School: College of Science and Engineering > School of Engineering > Infrastructure and Environment
• Journal Name: Transactions of Nonferrous Metals Society of China
• Publisher: Nonferrous Metals Society of China
• ISSN: 1003-6326
• ISSN (Online): 2210-3384
• Published Online: 06 June 2019
• Copyright Holders: Copyright © 2019 Nonferrous Metals Society of China
• First Published: First published in Transactions of Nonferrous Metals Society of China 29(5):1067-1081
• Publisher Policy: Reproduced in accordance with the copyright policy of the publisher