Calcined clays for low carbon cement: Rheological behaviour in fresh Portland cement pastes
| Autor: | Viviana Fátima Rahhal, R. Talero, C. Aramburo, M. González, César Pedrajas |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
02 engineering and technology Cement pastes 010402 general chemistry 01 natural sciences law.invention Crystallinity Rheology law Shear strength General Materials Science Calcination Pozzolanic additions Metakaolin Cement Mechanical Engineering Metallurgy Calcined clays Pozzolan 021001 nanoscience & nanotechnology Condensed Matter Physics Ingeniería Civil y de la Construcción 3. Good health 0104 chemical sciences Portland cement 13. Climate action Mechanics of Materials 0210 nano-technology |
| Zdroj: | Digital.CSIC. Repositorio Institucional del CSIC instname Materials Letters, ISSN 0167-577X, 2019-03, No. 239 Archivo Digital UPM Universidad Politécnica de Madrid |
| Popis: | In this paper the rheological behavior of fresh Portland cement pastes mixed with different calcined clays was analyzed. For this purpose, two samples of Portland cement with different mineral composition (one with low C3A and high C3S content and another with low C3S and high C3A) were used combined with different replacement percentages of two calcined clays (two different metakaolin). Grounded α-quartz was used as control as well. Both mineral admixtures had different crystallinity and morphology: the α-quartz is fully crystalline while metakaolin is completely amorphous with a very small crystalline fraction giving very high pozzolanic properties in the vitreous state. All determinations were performed in the hydration latency period. The results show that the fresh Portland cement paste with low C3A(%) content and high C3S(%) content present great shear strength and the replacement with calcined clays affects the rheological behavior of the fresh pastes depending on the greater or lower pozzolanic reactivity of the mineral addition. |
| Databáze: | OpenAIRE |
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