Durability of concrete exposed to leaching and external sulphate attacks
| Autor: | R. El Hachem, Frédéric Grondin, Emmanuel Rozière, Ahmed Loukili |
|---|---|
| Přispěvatelé: | Institut de Recherche en Génie Civil et Mécanique (GeM), Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-École Centrale de Nantes (ECN)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2009 |
| Předmět: |
Expansion
Ettringite Gypsum Materials science 0211 other engineering and technologies 02 engineering and technology engineering.material Portlandite Durability chemistry.chemical_compound 021105 building & construction [SPI.MECA.MEMA]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph] General Materials Science Composite material Sulfate attack Cement Metallurgy Lessivage Building and Construction 021001 nanoscience & nanotechnology Sulfate Resistant chemistry 13. Climate action Cements engineering Leaching Leaching (metallurgy) Mortar 0210 nano-technology |
| Zdroj: | Cement and Concrete Research Cement and Concrete Research, Elsevier, 2009, 39 (12), pp.1188-1198. ⟨10.1016/j.cemconres.2009.07.021⟩ |
| ISSN: | 0008-8846 |
| DOI: | 10.1016/j.cemconres.2009.07.021⟩ |
| Popis: | International audience; Leaching and external sulphate attack on concrete lead to dissolution of hydration products, mainly portlandite, and in case of ingress of sulphate ions to formation of expansive products such as gypsum and ettringite. Durability of concrete exposed to these environments is still based on prescriptive specifications. The aim of the study is to provide experimental data to design performance based tests and specifications for a comparative approach. Tests have been developed to study these degradations in controlled conditions at constant pH. A leaching test has been performed on concrete. Indicators can be deduced from the leaching test and they are sensitive to the variations of potential durability. An accelerated test using a high sulphate concentration has been performed on mortars. Expansion results are sensitive to mortar mix proportions and the test could be used to qualify cements or binders in a comparative approach. Concrete specimens are exposed to external sulphate attack at two levels of sulphate concentration to provide long-term data that can be used to study the relevance of the accelerated tests and models which are being developed. Results from both series of tests show a correlation between the resistance to leaching and the resistance to external sulphate attack. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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