| Autor: |
Sousa, S., Santos Silva, A., Velosa, A., Rocha, F. |
| Přispěvatelé: |
Vasco Peixoto Freitas, Helena Corvacho, Michael Lacasse |
| Jazyk: |
angličtina |
| Rok vydání: |
2011 |
| Předmět: |
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| Popis: |
The degradation of concrete structures by the internal expansive reactions (IER), which include the alkali-silica reaction (ASR) and the internal sulphate reaction (ISR) related with delayed ettringite formation (DEF), are two of the major problems that nowadays affect several concrete structures in the world. Therefore, it is essential to find preventive methods to inhibit the appearance of these reactions in new concrete structures. This research work aims to investigate the effectiveness of tungsten sludge from a Portuguese mine in the inhibition of IER and is part of an extensive study to elucidate the role that the mineral additions have in the mechanism of inhibition of IER in concrete. For this purpose several concrete mixes were produced by using tungsten sludge as a partial cement replacement. The results of accelerated expansion tests and microestructural evolution of the concretes show that the incorporation of 30% of tungsten sludge as cement replacement appears to be effective in the mitigation of ASR and ISR. The authors wish to acknowledge the Foundation for Science and Technology (FCT) for the financial support under project EXREACT (PTDC/CTM/65243/2006) and project DURATINET (Durable Transport Infrastructures in the Atlantic Area Network) for Transnational Programme Atlantic Area 2007-2003, co-financed by FEDER. 5 5 1617-1624 pp DM/NMM 2011 12 a 15 de Abril |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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