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Aggressive water attack on carbonated cement materials
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 w...
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| Format: | Thesis |
| Language: | English |
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Water Research Group
2016
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| _version_ | 1867613145753714689 |
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| access_status_str | Open Access |
| author | Mackintosh, Grant Stewart |
| author2 | Loewenthal, Richard Eric |
| author_browse | Loewenthal, Richard Eric Mackintosh, Grant Stewart |
| author_facet | Loewenthal, Richard Eric Mackintosh, Grant Stewart |
| author_sort | Mackintosh, Grant Stewart |
| collection | Thesis |
| description | 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. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/18239 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:31:30.019Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2016 |
| publishDateRange | 2016 |
| publishDateSort | 2016 |
| publisher | Water Research Group |
| publisherStr | Water Research Group |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/18239 Aggressive water attack on carbonated cement materials Mackintosh, Grant Stewart Loewenthal, Richard Eric Civil Engineering hydrodynamic forces 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. 2016-03-28T14:24:49Z 2016-03-28T14:24:49Z 1991 Master Thesis Masters MSc (Eng) http://hdl.handle.net/11427/18239 eng application/pdf Water Research Group Faculty of Engineering and the Built Environment University of Cape Town |
| spellingShingle | Civil Engineering hydrodynamic forces Mackintosh, Grant Stewart Aggressive water attack on carbonated cement materials |
| thesis_degree_str | Master's |
| title | Aggressive water attack on carbonated cement materials |
| title_full | Aggressive water attack on carbonated cement materials |
| title_fullStr | Aggressive water attack on carbonated cement materials |
| title_full_unstemmed | Aggressive water attack on carbonated cement materials |
| title_short | Aggressive water attack on carbonated cement materials |
| title_sort | aggressive water attack on carbonated cement materials |
| topic | Civil Engineering hydrodynamic forces |
| url | http://hdl.handle.net/11427/18239 |
| work_keys_str_mv | AT mackintoshgrantstewart aggressivewaterattackoncarbonatedcementmaterials |