Journal
CEMENT AND CONCRETE RESEARCH
Volume 35, Issue 2, Pages 301-314Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cemconres.2004.05.020
Keywords
paste backfill; compressive strength; sulphate; cement; modeling
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The increasing use of paste backfill in underground mining makes it necessary to quantify the effect of sulphate on the strength development and economical perfomance of paste backfill. Therefore, the main objective of this study was to develop a methodological approach and a mathematical model to analyze and predict the strength development and cost of underground paste backfill containing different amounts of sulphate. This study demonstrates that the paste backfill can be defined as a mixture system. We were able to show that a material model based on quadratic functions can be a suitable basis for the prediction of both the mechanical [uniaxial compressible strength (UCS)] and economic (binder cost) properties of paste backfill. The developed models allowed us to obtain valuable results about the relationship between the sulphate quantity and the mechanical performance of the backfill and the prediction of its strength at different curing times. This study has demonstrated that the sulphate significantly influences paste backfill strength. This influence is related to its concentration, the curing time and the amount and chemical composition of the cement. (C) 2004 Elsevier Ltd. All rights reserved.
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