The role of porosity in external sulphate attack
| Autor: | Sergio H.P. Cavalaro, Tai Ikumi, Ignacio Segura |
|---|---|
| Přispěvatelé: | Universitat Politècnica de Catalunya. Departament d'Enginyeria Civil i Ambiental, Universitat Politècnica de Catalunya. EC - Enginyeria de la Construcció |
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Abstract design 0211 other engineering and technologies Enginyeria civil::Materials i estructures::Materials i estructures de formigó [Àrees temàtiques de la UPC] 02 engineering and technology Building and Construction 021001 nanoscience & nanotechnology Durability Permeability (earth sciences) Concrete--Deterioration Phase composition Formigó -- Deterioració 021105 building & construction Sulphate attack General Materials Science Sulphate attack (C) Ettringite (D) X-ray diffraction (B) Mercury porosimetry (B) Pore structure Composite material Mortar 0210 nano-technology Porosity Expansive |
| Zdroj: | Recercat. Dipósit de la Recerca de Catalunya instname UPCommons. Portal del coneixement obert de la UPC Universitat Politècnica de Catalunya (UPC) |
| ISSN: | 0958-9465 |
| DOI: | 10.1016/j.cemconcomp.2018.12.016 |
| Popis: | Design codes promote a limitation of permeability (indirectly of porosity) to reduce the sulphate ingress and improve the resistance of concrete and mortar to external sulphate attack (ESA). However, porosity could also have a positive effect on durability by generating additional space to accommodate the expansive phases. The aim of this study is to evaluate the role of porosity in ESA. For that, changes at the macro-scale, phase composition and pore network are monitored for mortar compositions with different pore-size distribution. Results indicate the existence of two mechanisms: the capacity to accommodate expansive phases controls the durability during the initial stages of the attack, while at later stages durability is defined by the permeability. Results from specimens with air-entrainer suggest that the intentional increase of porosity towards maximising the capacity to accommodate expansive products might be a valid approach in order to reduce the expansive forces generated during ESA. |
| Databáze: | OpenAIRE |
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