Influence of temperature on the hydration products of low pH cements
| Autor: | Isabelle Pochard, Bertrand Revel, T. T. H. Bach, André Nonat, C. Cau Dit Coumes, Cyrille Mercier |
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| Přispěvatelé: | Laboratoire Interdisciplinaire Carnot de Bourgogne (LICB), Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS), Laboratoire des Matériaux Céramiques et Procédés Associés - EA 2443 (LMCPA), Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-INSA Institut National des Sciences Appliquées Hauts-de-France (INSA Hauts-De-France), Laboratoire Interdisciplinaire Carnot de Bourgogne ( LICB ), Université de Bourgogne ( UB ) -Centre National de la Recherche Scientifique ( CNRS ) |
| Jazyk: | angličtina |
| Rok vydání: | 2012 |
| Předmět: |
Ettringite
Gypsum Silica fume [SDV]Life Sciences [q-bio] Inorganic chemistry 0211 other engineering and technologies MAS NMR-SPECTROSCOPY TRICALCIUM SILICATE 02 engineering and technology engineering.material chemistry.chemical_compound Adsorption SI-29 021105 building & construction [CHIM]Chemical Sciences General Materials Science CALCIUM-SULFATE PART II AL-27 NMR ELEVATED-TEMPERATURES Anhydrite Building and Construction ALUMINUM 021001 nanoscience & nanotechnology Alkali metal Silicate C-S-H chemistry Chemical engineering engineering 0210 nano-technology Ternary operation PORTLAND-CEMENT |
| Zdroj: | Cement and Concrete Research Cement and Concrete Research, Elsevier, 2012, 42 (6), pp.805-817. ⟨10.1016/j.cemconres.2012.03.009⟩ Cement and Concrete Research, Elsevier, 2012, 42, pp.805--817. 〈10.1016/j.cemconres.2012.03.009〉 |
| ISSN: | 0008-8846 |
| DOI: | 10.1016/j.cemconres.2012.03.009⟩ |
| Popis: | International audience; The chemical evolution of two hydrated "low pH" binders prepared from binary (60% Portland cement + 40% silica fume) or ternary (37.5% Portland cement +32.5% silica fume + 30% fly-ash) mixtures was characterized over one year at 20 degrees C. 50 degrees C, and 80 degrees C. The main hydrates were Al-substituted C-S-H. Raising the temperature from 20 to 80 degrees C caused a lengthening and cross-linking of their silicate chains. Ettringite that formed in pastes stored at 20 degrees C was destabilized. Only traces of calcium sulfate (gypsum and/or anhydrite) reprecipitated after one year in some materials cured at 50 degrees C and 80 degrees C. The sulfates released were therefore partially adsorbed on the C-A-S-H and dissolved in the pore solution. The pore solution pH dropped by about 2 units as the temperature increased. Conversely, the soluble alkali fractions did not change significantly. Only the ternary binder resulted in a pore solution pH below 11 at the three temperatures studied. |
| Databáze: | OpenAIRE |
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