Optimal cement paste yield stress for the production of stable cement foams
| Autor: | Blandine Feneuil, Olivier Pitois, Nicolas Roussel |
|---|---|
| Přispěvatelé: | Laboratoire Navier (NAVIER UMR 8205), École des Ponts ParisTech (ENPC)-Centre National de la Recherche Scientifique (CNRS)-Université Gustave Eiffel |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Cement
Materials science Bubble 0211 other engineering and technologies FOS: Physical sciences 02 engineering and technology Building and Construction Condensed Matter - Soft Condensed Matter 021001 nanoscience & nanotechnology Cement paste symbols.namesake [SPI]Engineering Sciences [physics] 021105 building & construction Air content symbols Soft Condensed Matter (cond-mat.soft) General Materials Science van der Waals force Composite material 0210 nano-technology |
| Zdroj: | Cement and Concrete Research Cement and Concrete Research, Elsevier, 2019, 120, pp.142-151. ⟨10.1016/j.cemconres.2019.03.002⟩ |
| ISSN: | 0008-8846 |
| DOI: | 10.1016/j.cemconres.2019.03.002⟩ |
| Popis: | Production of morphology-controlled cement foams remains challenging, mainly due to bubble stability issues during cement setting. The use of cement paste with high yield stress is expected to promote stability by damping intrinsic bubble kinetics. Here we show however that for given W/C ratio, fresh foam stability can be achieved instead by decreasing the yield stress of the cement paste. Indeed, in this low apparent yield stress regime, van der Waals attraction between cement grains is reduced and grains are allowed to be efficiently packed by bubbles, providing enhanced mechanical properties. This result is obtained for two distinct additives used at controlled concentrations and without resorting to set accelerators, which highlights the general significance of the underlying stability mechanism. It offers a promising solution to produce stable cement foams at high air content. 31 pages, 18 figures, accepted preprint |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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