Influence of hydrothermal curing regimes on the hydration of fiber-reinforced cement composites
| Autor: | Lubomir Bagel, Jana Kozánková, Vladimír Živica, Marta Kuliffayova, Martin Palou |
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| Rok vydání: | 2013 |
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| Zdroj: | Journal of Thermal Analysis and Calorimetry. 113:219-229 |
| ISSN: | 1572-8943 1388-6150 |
| DOI: | 10.1007/s10973-013-2943-4 |
| Popis: | Simultaneous thermal analysis (DTA and TG) was applied to two fiber-reinforced cement composites cured in autoclave at 0.3, 1.2, and 2.0 MPa for 24, 72, and 168 h. Mercury intrusion porosimeter (MIP) and scanning electronic microscope (SEM) were used to complete the investigations. Thermal analysis was used to identify temperature ranges of thermal decomposition of cured samples and to characterize the nature of hydrate products. Also, fractured surface and surface microstructure were investigated by means of SEM. Based on the results of thermal analysis, three processes occurred during hydrothermal curing. The first one consists of primary hydration reaction leading to the formation of C–S–H, C3AH6, and AH3. The second one is the process characterized by partial decomposition or interaction of primary products to form secondary products (C2ASH8, C3AH1.5). The last one is the carbonation of some hydrate products. Hydrothermal pressure can enhance the compressive strength, but can also cause its depletion over time. The MIP study has revealed an existence of bimodal pore size distribution that the characteristic depends on the hydrothermal curing conditions. |
| Databáze: | OpenAIRE |
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