Residual Capability of Alkali Binding by Hydrated Pozzolanic Cements in Long-Service Concrete Structures
An experimental procedure was developed and applied to cement pastes made with two different pozzolanic cements (CEM IV/B (P) and CEM IV/B (V)) in order to ascertain the existence of a residual capability of alkali binding by long-term hydrated pozzolanic cements and, at the same time, to evaluate t...
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Wiley
2018-01-01
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| Series: | Advances in Materials Science and Engineering |
| Online Access: | http://dx.doi.org/10.1155/2018/4853141 |
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| author | Mario Berra Teresa Mangialardi Antonio Evangelista Paolini |
| author_facet | Mario Berra Teresa Mangialardi Antonio Evangelista Paolini |
| author_sort | Mario Berra |
| collection | DOAJ |
| description | An experimental procedure was developed and applied to cement pastes made with two different pozzolanic cements (CEM IV/B (P) and CEM IV/B (V)) in order to ascertain the existence of a residual capability of alkali binding by long-term hydrated pozzolanic cements and, at the same time, to evaluate the alkali retention capability and the concentration of OH− ions in the pore solution of such cementitious matrices. The developed procedure consisted of accelerated curing of cement paste specimens (150 days at 60°C and 100% RH), subsequent leaching tests at 60°C for 30 days by using deionized water or basic solutions (NaOH or KOH at different concentrations) as leaching media, and correlation of the leaching test results with a simple mass balance equation for sodium and potassium ions. The developed procedure was found to be appropriate for evaluating both the pore liquid alkalinity and the alkali retention capability by long-term hydrated pozzolanic cement pastes. A residual capability of alkali binding was also identified for both tested pozzolanic cements, thus indicating their potential ability to prevent (CEM IV/B (V)) or minimize (CEM IV/B (P)) the risk of deleterious expansion associated with alkali-aggregate reaction in long-service concrete structures, like concrete dams. |
| format | Article |
| id | doaj-art-7436c0a84f3c4cf78d119c8ebb5552ad |
| institution | Kabale University |
| issn | 1687-8434 1687-8442 |
| language | English |
| publishDate | 2018-01-01 |
| publisher | Wiley |
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| series | Advances in Materials Science and Engineering |
| spelling | doaj-art-7436c0a84f3c4cf78d119c8ebb5552ad2025-02-03T06:10:49ZengWileyAdvances in Materials Science and Engineering1687-84341687-84422018-01-01201810.1155/2018/48531414853141Residual Capability of Alkali Binding by Hydrated Pozzolanic Cements in Long-Service Concrete StructuresMario Berra0Teresa Mangialardi1Antonio Evangelista Paolini2Ricerca sul Sistema Energetico (RSE) S.p.A., Via Rubattino 54, 20134 Milano, ItalyDepartment of Chemical Materials Environment Engineering, University “La Sapienza”, Via Eudossiana 18, 00184 Roma, ItalyDepartment of Chemical Materials Environment Engineering, University “La Sapienza”, Via Eudossiana 18, 00184 Roma, ItalyAn experimental procedure was developed and applied to cement pastes made with two different pozzolanic cements (CEM IV/B (P) and CEM IV/B (V)) in order to ascertain the existence of a residual capability of alkali binding by long-term hydrated pozzolanic cements and, at the same time, to evaluate the alkali retention capability and the concentration of OH− ions in the pore solution of such cementitious matrices. The developed procedure consisted of accelerated curing of cement paste specimens (150 days at 60°C and 100% RH), subsequent leaching tests at 60°C for 30 days by using deionized water or basic solutions (NaOH or KOH at different concentrations) as leaching media, and correlation of the leaching test results with a simple mass balance equation for sodium and potassium ions. The developed procedure was found to be appropriate for evaluating both the pore liquid alkalinity and the alkali retention capability by long-term hydrated pozzolanic cement pastes. A residual capability of alkali binding was also identified for both tested pozzolanic cements, thus indicating their potential ability to prevent (CEM IV/B (V)) or minimize (CEM IV/B (P)) the risk of deleterious expansion associated with alkali-aggregate reaction in long-service concrete structures, like concrete dams.http://dx.doi.org/10.1155/2018/4853141 |
| spellingShingle | Mario Berra Teresa Mangialardi Antonio Evangelista Paolini Residual Capability of Alkali Binding by Hydrated Pozzolanic Cements in Long-Service Concrete Structures Advances in Materials Science and Engineering |
| title | Residual Capability of Alkali Binding by Hydrated Pozzolanic Cements in Long-Service Concrete Structures |
| title_full | Residual Capability of Alkali Binding by Hydrated Pozzolanic Cements in Long-Service Concrete Structures |
| title_fullStr | Residual Capability of Alkali Binding by Hydrated Pozzolanic Cements in Long-Service Concrete Structures |
| title_full_unstemmed | Residual Capability of Alkali Binding by Hydrated Pozzolanic Cements in Long-Service Concrete Structures |
| title_short | Residual Capability of Alkali Binding by Hydrated Pozzolanic Cements in Long-Service Concrete Structures |
| title_sort | residual capability of alkali binding by hydrated pozzolanic cements in long service concrete structures |
| url | http://dx.doi.org/10.1155/2018/4853141 |
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