New insights into water dynamics of Portland cement paste with nano-additives using quasielastic neutron scattering
| Autor: | Nicholas P. Butch, Madhusudan Tyagi, Ali Bumajdad, Oral Buyukozturk, Kunal Kupwade-Patil, Craig M. Brown, Abdullah F. Jamsheer |
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| Rok vydání: | 2018 |
| Předmět: |
musculoskeletal diseases
Cement Materials science Mechanical Engineering technology industry and agriculture 02 engineering and technology equipment and supplies 010402 general chemistry 021001 nanoscience & nanotechnology Retarder 01 natural sciences 0104 chemical sciences law.invention Portland cement surgical procedures operative Water dynamics Chemical engineering Mechanics of Materials law Nano Quasielastic neutron scattering Bound water General Materials Science 0210 nano-technology Metakaolin |
| Zdroj: | Springer US |
| ISSN: | 1573-4803 0022-2461 |
| DOI: | 10.1007/s10853-018-03212-x |
| Popis: | Early-age hydration kinetics of Portland cement with nano-additives such as nano-silica (NS) was examined using quasielastic neutron scattering (QENS). Cement pastes with different ratios of Portland cement to NS were prepared. The concentration of the NS played a major role in controlling the free and bound water during the hydration of the cement paste. Additionally, the effects of metakaolin (MK) with NS in Portland cements revealed that MK acts as a retarder by decreasing the bounding water capacity during the early age of hydration. An increase in the concentration of NS affected the degree of hydration by reducing the amount of free and mobile water in the gel pores when compared to Portland cement paste. Here, we show that the concentration of NS governs the early-age hydration process in Portland cements. |
| Databáze: | OpenAIRE |
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