Direct Transmission Electron Microscopy Visualization of the Cement Reaction by Colloidal Aggregation of Fumed Silica
| Autor: | Hisao Satoh, Yuki Kimura, Erika Furukawa |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Cement
Materials science General Chemical Engineering 02 engineering and technology General Chemistry engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Industrial and Manufacturing Engineering Portlandite 0104 chemical sciences chemistry.chemical_compound Colloid chemistry Chemical engineering Transmission electron microscopy engineering Nanometre Calcium silicate hydrate 0210 nano-technology Dissolution Fumed silica |
| Zdroj: | Industrial & Engineering Chemistry Research. 57:79-83 |
| ISSN: | 1520-5045 0888-5885 |
| DOI: | 10.1021/acs.iecr.7b04137 |
| Popis: | Unlike other solidified materials, concrete has an internal structure that contains small pores that vary in size from several nanometers to the submicrometer range. These pores govern the strength of the material and hence the lifetime of concrete buildings. The size of the pores is governed by the presence of calcium silicate hydrate (CaO·2SiO2·4H2O, C–S–H). To identify how the pore size is determined during the concretion process, we used transmission electron microscopy to examine the early solidification of a simplified reaction system consisting of silica, portlandite [Ca(OH)2, CH], and water. The silica particles, used to suppress the degradation of concrete, expanded and, consequently, embedded the pores through hydration before C–S–H was formed, contrary to the predicted decrease in pore size by C–S–H formation after simple dissolution of silica. Visualization of this type of solidification process should permit improvement in the mechanical strength of concrete. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|