Numerical Model of the Alkali-silica Reaction Development with External Source of Alkalis
| Autor: | Witold Grymin, Marcin Koniorczyk, Dariusz Gawin, Francesco Pesavento |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Materials science
Aggregate (composite) Diffusion 0211 other engineering and technologies Mineralogy 02 engineering and technology General Medicine chemical degradation 021001 nanoscience & nanotechnology Alkali metal External source porous media mechanics Chemical engineering alkali-silica reaction 021105 building & construction Alkali–silica reaction Mortar 0210 nano-technology Porous medium Chemical decomposition |
| Popis: | Experimental research, in which mortars prepared with reactive aggregates have been exposed to different conditions, has been performed. The samples have been stored in water or 1 M NaOH water solution at 80 °C. Based on the observed strains, ASR extent has been calculated. Mathematical model of combined action of hygro-thermal, chemical and mechanical phenomena has been developed to analyze evolution of the ASR reaction. It is based on mechanics of multiphase porous media. Development of the ASR depends on the alkali content. Diffusion of alkalis from the cement paste to the aggregate grains is considered. Both external alkali sources and alkali binding by the formed ASR gel are taken into account. The proposed mathematical model has been validated by comparison with the experimental results. |
| Databáze: | OpenAIRE |
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