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• W2005310644 abstract "The solubility constant of calcium peroxide octahydrate (Kper) is determined in relation to temperature through an experimental method based on pH monitoring. The value of Kper = (CaOH+) (HO2-) (H2O)7 is provided by the modified Arrhenius expression Kper=7.329×10-161×T58.929×exp(5061.5/T). At 25 °C, Kper = (1.13 ± 0.01) × 10−7. That expression takes into account the kinetics of the homogeneous decomposition of hydrogen peroxide according to the H2O2+HO2-→H2O+OH-+O2 mechanism. The variation of the rate constant with temperature is achieved by completing the data taken from the literature by observing the kinetics at 65 °C and is expressed as k = A × exp (−Ea/RT) where A = 600 M−1 s−1 and Ea = 35 kJ/mol. At 25 °C, k = (4.5 ± 0.1) × 10−4 M−1 s−1. In parallel, a new presentation of the available data on calcium equilibria in relation to temperature (complexation of Ca2+ and of CaOH+, solubility of portlandite) is used to support the simulations made on the overall system (calcium + peroxide). By integrating the new data, it is possible to forecast a specific behaviour of γ radiolysis in a cement-based material as a function of the temperature. Below 25 °C, CaO2·8H2O precipitation acts in synergy with Allen’s chain-reaction and leads rapidly to a stationary state with a small amount of H2. At 25 °C and above, precipitation stops, the stationary state is more difficult to achieve and the production of both H2 and O2 is significantly higher." @default.
• W2005310644 created "2016-06-24" @default.
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• W2005310644 date "2012-01-01" @default.
• W2005310644 modified "2023-09-25" @default.
• W2005310644 title "The solubility constant of calcium peroxide octahydrate in relation to temperature; its influence on radiolysis in cement-based materials" @default.
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• W2005310644 doi "https://doi.org/10.1016/j.jnucmat.2011.09.009" @default.
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