Aggressive water attack on carbonated cement materials

 

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dc.contributor.advisor Loewenthal, Richard Eric en_ZA
dc.contributor.author Mackintosh, Grant Stewart en_ZA
dc.date.accessioned 2016-03-28T14:24:49Z
dc.date.available 2016-03-28T14:24:49Z
dc.date.issued 1991 en_ZA
dc.identifier.citation Mackintosh, G. 1991. Aggressive water attack on carbonated cement materials. University of Cape Town. en_ZA
dc.identifier.uri http://hdl.handle.net/11427/18239
dc.description.abstract Aggressive attack on samples was monitored by measuring changes in chemical characteristics of the water exposed to cement concrete samples, inter alia pH, calcium and alkalinity. Over the period of the investigation (100 days) the following observations were found to apply to both brown and white water: (i) Generally uncarbonated OPC experiences significantly higher calcium mineral dissolution rates than both carbonated OPC and 30% fly ash OPC cement concretes. (ii) Once steady dissolution rates were attained, measurements indicated that 30% fly ash OPC and carbonated OPC concrete undergo closely the same calcium mineral dissolution rates. Before these findings are implemented, the following practical considerations need to be addressed: (i) An economic assessment of the benefits of using carbonated OPC, fly ash OPC and carbonated fly ash OPC as a means of resisting aggressive attack. (ii) The investigation should be upgraded from laboratory scale to pilot scale. (iii) The influence of accelerated carbonation on corrosion of steel reinforcing. en_ZA
dc.language.iso eng en_ZA
dc.subject.other Civil Engineering en_ZA
dc.subject.other hydrodynamic forces en_ZA
dc.title Aggressive water attack on carbonated cement materials en_ZA
dc.type Master Thesis
uct.type.publication Research en_ZA
uct.type.resource Thesis en_ZA
dc.publisher.institution University of Cape Town
dc.publisher.faculty Faculty of Engineering and the Built Environment
dc.publisher.department Water Research Group en_ZA
dc.type.qualificationlevel Masters
dc.type.qualificationname MSc (Eng) en_ZA
uct.type.filetype Text
uct.type.filetype Image
dc.identifier.apacitation Mackintosh, G. S. (1991). <i>Aggressive water attack on carbonated cement materials</i>. (Thesis). University of Cape Town ,Faculty of Engineering & the Built Environment ,Water Research Group. Retrieved from http://hdl.handle.net/11427/18239 en_ZA
dc.identifier.chicagocitation Mackintosh, Grant Stewart. <i>"Aggressive water attack on carbonated cement materials."</i> Thesis., University of Cape Town ,Faculty of Engineering & the Built Environment ,Water Research Group, 1991. http://hdl.handle.net/11427/18239 en_ZA
dc.identifier.vancouvercitation Mackintosh GS. Aggressive water attack on carbonated cement materials. [Thesis]. University of Cape Town ,Faculty of Engineering & the Built Environment ,Water Research Group, 1991 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/18239 en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Mackintosh, Grant Stewart AB - Aggressive attack on samples was monitored by measuring changes in chemical characteristics of the water exposed to cement concrete samples, inter alia pH, calcium and alkalinity. Over the period of the investigation (100 days) the following observations were found to apply to both brown and white water: (i) Generally uncarbonated OPC experiences significantly higher calcium mineral dissolution rates than both carbonated OPC and 30% fly ash OPC cement concretes. (ii) Once steady dissolution rates were attained, measurements indicated that 30% fly ash OPC and carbonated OPC concrete undergo closely the same calcium mineral dissolution rates. Before these findings are implemented, the following practical considerations need to be addressed: (i) An economic assessment of the benefits of using carbonated OPC, fly ash OPC and carbonated fly ash OPC as a means of resisting aggressive attack. (ii) The investigation should be upgraded from laboratory scale to pilot scale. (iii) The influence of accelerated carbonation on corrosion of steel reinforcing. DA - 1991 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1991 T1 - Aggressive water attack on carbonated cement materials TI - Aggressive water attack on carbonated cement materials UR - http://hdl.handle.net/11427/18239 ER - en_ZA


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