Cross-scale characteristics of backfill material using NMR and fractal theory

Hu, J.-h., Ren, Q.-f., Yang, D.-j., Ma, S.-w., Shang, J.-l. , Ding, X.-t. and Luo, Z.-q. (2020) Cross-scale characteristics of backfill material using NMR and fractal theory. Transactions of Nonferrous Metals Society of China, 30(5), pp. 1347-1363. (doi: 10.1016/S1003-6326(20)65301-8)

Abstract

This paper analyzed the pore structure, quantified the pore fractal dimension, calculated the grading index (GI) of mixed aggregate, and studied the relationship among GI, pore structure, and strength to describe the cross-scale characteristics of backfill, which is made from stone powder and cemented tailing. A series of experiments were conducted on stone powder cement tailings backfill (SPCTB). The GI formulas for mixed aggregates, containing stone powder and tailings, were derived based on the Füller theory. The nuclear magnetic resonance (NMR) fractal dimensions of backfills were derived using fractal geometry principles. Compared to the mesopore and macropore fractal dimensions, the correlation between micropore fractal dimension and macro-properties in terms of NMR porosity, pore structure complexity, uniaxial compression strength (UCS), and GI is the most significant. Macropore fractal dimension is generally correlated with UCS and GI and the other properties such as the shape of mixed aggregates also have an impact on fractal dimension. However, mesopore fractal dimension has no obvious relationship with macro-properties. Finally, the relationship between GI and UCS was studied, which contributed to improving backfill’s strength and optimizing gradation.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Shang, Dr Junlong
• Authors: Hu, J.-h., Ren, Q.-f., Yang, D.-j., Ma, S.-w., Shang, J.-l., Ding, X.-t., 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: Elsevier
• ISSN: 1003-6326
• ISSN (Online): 2210-3384
• Published Online: 05 June 2020
• Copyright Holders: Copyright © 2020 Elsevier
• First Published: First published in Transactions of Nonferrous Metals Society of China 30(5):1347-1363
• Publisher Policy: Reproduced in accordance with the copyright policy of the publisher