Leaching effect on mechanical properties of cement-aggregate interface
| Autor: | Eric Garcia-Diaz, C. Pelissou, Mouad Jebli, M. S. El Youssoufi, Frédéric Jamin, Etienne Malachanne |
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| Přispěvatelé: | Structures Innovantes, Géomatériaux, ECOconstruction (SIGECO), Laboratoire de Mécanique et Génie Civil (LMGC), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Centre des Matériaux des Mines d'Alès (C2MA), IMT - MINES ALES (IMT - MINES ALES), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), Laboratoire de micromécanique et intégrité des structures (MIST), Institut de Radioprotection et de Sûreté Nucléaire (IRSN)-Centre National de la Recherche Scientifique (CNRS), Institut de Radioprotection et de Sûreté Nucléaire (IRSN), Pôle Matériaux et Structures du Génie Civil (Pôle MSGC), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-IMT - MINES ALES (IMT - MINES ALES) |
| Rok vydání: | 2018 |
| Předmět: |
Materials science
Ammonium nitrate Composite number 0211 other engineering and technologies 02 engineering and technology Cement paste chemistry.chemical_compound 021105 building & construction Ultimate tensile strength General Materials Science Composite material Tensile test Tensile testing Cement Drop (liquid) Building and Construction 021001 nanoscience & nanotechnology Chemical degradation Phenolphthalein chemistry Leaching Shear test Local scale Cement-aggregate interface Direct shear test [SPI.GCIV.MAT]Engineering Sciences [physics]/Civil Engineering/Matériaux composites et construction 0210 nano-technology |
| Zdroj: | Cement and Concrete Composites Cement and Concrete Composites, Elsevier, 2018, 87, pp.10-19. ⟨10.1016/j.cemconcomp.2017.11.018⟩ |
| ISSN: | 0958-9465 |
| Popis: | International audience; This study concerns the characterization of the mechanical properties of the cement paste and of the cement-aggregate interface in the degraded state by a chemical leaching mechanism. This study is carried out within the framework of the MIST laboratory. The experimental tests were carried out on cement paste and composites consisting of aggregates bound by the same cement paste prepared with a water/cement ratio of 0.5. The particular experimental devices, designed and produced for the purposes of this study, made it possible to directy solicit the composites at the cement-aggregate interface. As the process of leaching with the deionized water occurs very slowly, the experimental study is accelerated in the laboratory by replacing water by ammonium nitrate solution. To quantify the development and kinetics of chemical degradation at the cemented bond, the concrete leaching fronts are characterized at different times of degradation by using phenolphthalein. The local mechanical tests (tensile and shear) are performed on cement paste and composite at different degradation rate. The experimental results show a fast drop in shear or tensile strength of about 45% at the beginning of degradation. These results confirm the effect of the cement paste-aggregate interface degradation on the mechanical properties. |
| Databáze: | OpenAIRE |
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