Effect of hydration kinetics on properties of compositionally similar binders
| Autor: | M. Ben Haha, S. Hoock, Christopher Stabler, Maciej Zajac |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Ettringite
Materials science Aluminate Kinetics 0211 other engineering and technologies Mineralogy 02 engineering and technology Building and Construction 021001 nanoscience & nanotechnology Silicate chemistry.chemical_compound chemistry Chemical engineering Phase (matter) 021105 building & construction General Materials Science 0210 nano-technology Porosity Dissolution Chemical composition |
| Zdroj: | Cement and Concrete Research. 101:13-24 |
| ISSN: | 0008-8846 |
| Popis: | Four types of binders, based on the three different clinkers are investigated. These binders are of similar bulk chemical composition but contain different aluminate and silicate phases, which dissolve at different rates. The differences in reaction kinetics result in different phases assemblage at early ages. The phase assemblages tend to converge at later ages. Ettringite, AFm phases, C-S-H and stratlingite are the main hydrates. Their kinetics of formation and quantities depend on the dissolution rate of the anhydrous material. The differences in hydrates assemblage impact on the microstructures. Systems with ettringite or other crystalline hydrates as main hydration products at early ages, result in a coarser porosity. A refinement of the porosity is found in all the investigated samples with the ongoing formation of amorphous hydrates. Two mechanisms responsible for reduced hydration kinetics at later ages are identified: high Al concentration in the pore solution and dense microstructure. |
| Databáze: | OpenAIRE |
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