MAS NMR Studies of Partially Carbonated Portland Cement and Tricalcium Silicate Pastes
| العنوان: | MAS NMR Studies of Partially Carbonated Portland Cement and Tricalcium Silicate Pastes |
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| المؤلفون: | Sabine Thomas, Karin Meise-Gresch, Werner Müller-Warmuth, Ivan Odler |
| المصدر: | Journal of the American Ceramic Society. 76:1998-2004 |
| بيانات النشر: | Wiley, 1993. |
| سنة النشر: | 1993 |
| مصطلحات موضوعية: | Magic angle, Materials science, Carbonation, Silicate, law.invention, Thermogravimetry, chemistry.chemical_compound, Portland cement, Polymerization, chemistry, Carbonatation, law, Differential thermal analysis, Materials Chemistry, Ceramics and Composites, Composite material, Nuclear chemistry |
| الوصف: | 29Si, 27Al, and 1H MAS NMR studies of partially carbonated mature ordinary Portland cement (OPC) and tricalcium silicate (C3S) pastes have been carried out. The water-to-solid ratios (W/S) have been varied between 0 and 1 at hydration temperatures of 23o and 90oC. Various Q ni units with n=0, 1,2,3, and 4, and a Q3 (1Al) group have been identified using 29Si NMR. Cross-polarization experiments, in addition, have made it possible to assign the OH groups. Two types of fourfold- and one type sixfold-coordinated aluminum have been distinguished using 27Al NMR. In C3S pastes for w/s>0.7, progressive carbonation leads to a nearly perfect three-dimensional network consisting of Q3 and Q4only. In contrast, in OPC pasted only about 40% of the highly polymerized silicate units are formed, partially copolymerized with AlO4 tetrahedra. |
| تدمد: | 1551-2916 0002-7820 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::800fa63f37282382e62a890c52b5cac5 https://doi.org/10.1111/j.1151-2916.1993.tb08323.x |
| حقوق: | CLOSED |
| رقم الأكسشن: | edsair.doi...........800fa63f37282382e62a890c52b5cac5 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 15512916 00027820 |
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