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Please use this identifier to cite or link to this item: http://hdl.handle.net/1807/24643

Title: Electromagnetic Characterization of Cemented Paste Backfill in the Field and Laboratory
Authors: Thottarath, Sujitlal
Advisor: Grabinsky, Murray
Department: Civil Engineering
Keywords: Cemented Paste Backfill
electromagnetic waves
dielectric permittivity
electrical conductivity
capacitance probes
Issue Date: 28-Jul-2010
Abstract: Cemented Paste Backfill (CPB) is a relatively new backfilling technology for which a better understanding of binder hydration is required. This research uses electromagnetic (EM) wave-based techniques to non-destructively study a CPB consisting of tailings, sand, process water and binder (90% blast-furnace slag; 10% Portland cement). EM experiments were performed using a broadband network analyzer (20 MHz to 1.3 GHz) in the lab and capacitance probes (70 MHz) in the lab and field. Results showed that the EM properties are sensitive to curing time, operating frequency and specimen composition including binder content. The volumetric water content interpreted from dielectric permittivity varied little with curing. Temporal variations in electrical conductivity reflected the different stages of hydration. Laboratory results aided interpretation of field data and showed that a reduction in binder content from 4.5% to 2.2% delays setting of CPB from 0.5 days to over 2 days, which has important implications for mine design.
URI: http://hdl.handle.net/1807/24643
Appears in Collections:Master
Department of Civil Engineering - Master theses

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