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Investigation on the Immobilisation of Carbon in OPC-BFS and OPC-PFA Systems

Published online by Cambridge University Press:  01 February 2011

Hajime Kinoshita ,
Paulo H. R. Borges ,
Claire A. Utton ,
Neil B. Milestone  and
Cyril Lynsdale
Hajime Kinoshita
Affiliation:
Department of Engineering Materials, The University of Sheffield, Mappin Street, Sheffield, S1 3JD, U.K.
Paulo H. R. Borges
Affiliation:
Department of Engineering Materials, The University of Sheffield, Mappin Street, Sheffield, S1 3JD, U.K.
Claire A. Utton
Affiliation:
Department of Engineering Materials, The University of Sheffield, Mappin Street, Sheffield, S1 3JD, U.K.
Neil B. Milestone
Affiliation:
Department of Engineering Materials, The University of Sheffield, Mappin Street, Sheffield, S1 3JD, U.K.
Cyril Lynsdale
Affiliation:
Department of Civil and Structural Engineering, The University of Sheffield, Mappin Street, Sheffield, S1 3JD, U.K.
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Abstract

The reaction of CO2 gas with OPC, OPC-BFS and OPC-PFA composite cement systems were studied using XRD, SEM and TG to investigate the applicability of these materials to immobilise carbon arising from graphite waste. XRD results suggested that calcite formed in OPC system after the carbonation reaction, whereas calcite and vaterite were observed in OPCBFS and OPC-PFA systems. In OPC system, nearly half of Ca(OH)2 was consumed to form CaCO3. In OPC-BFS and OPC-PFA systems, the amount of CaCO3 formed, corresponded to the consumption of greater than 100% of Ca(OH)2 initially present, suggesting that other hydration products e.g. C-S-H were also consumed, either directly or indirectly during the carbonation process. The OPC-BFS system became more porous after carbonation. OPC-PFA system indicated a high efficiency on the conversion of Ca in the system into CaCO3.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1107: Scientific Basis for Nuclear Waste Management XXXI , 2008 , 143
Copyright
Copyright © Materials Research Society 2008

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