Chemo-physical modeling of cement mortar hydration: Role of aggregates
| Autor: | Nordine Leklou, Pierre Mounanga, Hamidréza Ramézani, Jena Jeong |
|---|---|
| Přispěvatelé: | Institut de Recherche en Constructibilité (IRC), Communauté Université Paris-Est-École Spéciale des Travaux Publics, du Bâtiment et de l'Industrie [Paris] (ESTP ), Centre de Recherche sur la Matière Divisée (CRMD), Centre National de la Recherche Scientifique (CNRS)-Université d'Orléans (UO), 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) |
| Rok vydání: | 2013 |
| Předmět: |
Hydration Chemical affinity
Materials science Scanning electron microscope Replica method 0211 other engineering and technologies Mixing (process engineering) Mineralogy 02 engineering and technology [SPI.MAT]Engineering Sciences [physics]/Materials Matrix (geology) 021105 building & construction Thermal Physical and Theoretical Chemistry Composite material Instrumentation Cement Chemo-thermal coupling [SPI.MECA]Engineering Sciences [physics]/Mechanics [physics.med-ph] 021001 nanoscience & nanotechnology Condensed Matter Physics Cement mortar 3D-FEM modeling Mortar 0210 nano-technology Material properties Hydrate |
| Zdroj: | Thermochimica Acta Thermochimica Acta, Elsevier, 2013, 564, pp.70-82. ⟨10.1016/j.tca.2013.03.034⟩ |
| ISSN: | 0040-6031 |
| DOI: | 10.1016/j.tca.2013.03.034 |
| Popis: | International audience; After mixing of the cement with water, most of the anhydride products sustain the hydration process and this leads to the hydrate products, e.g. CSH, Ca(OH)2, Afm and Aft. The mentioned hydration process is a highly complex phenomenon involving the chemically based thermo-activation inside the cement mortars during the early age hydration process. The chemo-thermal hydration reactions drasticaly increase at the early age of hydration after the mixing action and then it becomes less important and turns to be nearly asymptotic. The progress of the hydration phenomenon drives the material properties change during the very early age of cement hydration. Regarding the mortar and concrete, such hydration process would not be homogeneous through the cement matrix due to the aggregates presence. These inclusions will affect the temperature distribution as well as degree of hydration. In the current contribution, the chemical and thermal hydration have been firstly investigated by means of SEM observations using replica method and secondly by the 3D-FEM numerical experiments including two different case studies using glass beads as aggregates. The numerical experiments match fairly good the experimental measurements obtained using a pseudo-adiabatic testing setup for the case studies herein. The scanning electron microscopy (SEM) images observation demonstrates the gap spaces around the glass beads next to the external surfaces. These gaps can be essentially seen for the multi-glass beads case study. The role of the temperature and degree of hydration gradients are clearly obtained using the numerical samples. Some fresh routes and outlooks have been afterwards discussed. |
| Databáze: | OpenAIRE |
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