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Hydration of beta-dicalcium silicate at high temperatures under hydrothermal conditions
Hydration of beta-dicalcium silicate was carried out under hydrothermal conditions at different temperatures from 50 degree C to 400 degree C up to 5 days by using two methods to start the reactions at room temperature or at a desired reaction temperature. 9 C-S-H phases with the same Ca/Si ratio as precursor (gamma-dicalcium silicate hydrate and alpha-dicalcium silicate hydrate and dellaite), Ca-rich compositions (jaffeite and reinhardbraunsite), Si-rich compositions (Ca8Si5O18, kilchoanite and foshagite), and C-S-H gel were obtained at the initial stage of the hydration of beta-dicalcium silicate. The reaction products were different in dependence in the hydrothermal processes. It was found that alpha-dicalcium silicate hydrate was directly formed from beta-dicalcium silicate at low temperatures below 220 degree C. The products obtained at above 240 degree C were different in dependence in the hydrothermal processes, due to the different decomposition route of gamma-dicalcium silicate hydrate, the initial product from beta-dicalcium silicate. The room temperature mixing method gave reinhardbraunsite and kilchoanite through Ca8Si5O18. In the case of the high temperature mixing method, gamma-dicalcium silicate hydrate decomposed to from Ca8Si5O18 and reinhardbraunsite with jaffeite, then Ca8Si5O18 decomposed to from jaffeite and kilchoanite, and final products at 400 degree C were reinhardbraunsite and foshagite which was formed from kilchoanite.
Hydration of beta-dicalcium silicate at high temperatures under hydrothermal conditions
Hydration of beta-dicalcium silicate was carried out under hydrothermal conditions at different temperatures from 50 degree C to 400 degree C up to 5 days by using two methods to start the reactions at room temperature or at a desired reaction temperature. 9 C-S-H phases with the same Ca/Si ratio as precursor (gamma-dicalcium silicate hydrate and alpha-dicalcium silicate hydrate and dellaite), Ca-rich compositions (jaffeite and reinhardbraunsite), Si-rich compositions (Ca8Si5O18, kilchoanite and foshagite), and C-S-H gel were obtained at the initial stage of the hydration of beta-dicalcium silicate. The reaction products were different in dependence in the hydrothermal processes. It was found that alpha-dicalcium silicate hydrate was directly formed from beta-dicalcium silicate at low temperatures below 220 degree C. The products obtained at above 240 degree C were different in dependence in the hydrothermal processes, due to the different decomposition route of gamma-dicalcium silicate hydrate, the initial product from beta-dicalcium silicate. The room temperature mixing method gave reinhardbraunsite and kilchoanite through Ca8Si5O18. In the case of the high temperature mixing method, gamma-dicalcium silicate hydrate decomposed to from Ca8Si5O18 and reinhardbraunsite with jaffeite, then Ca8Si5O18 decomposed to from jaffeite and kilchoanite, and final products at 400 degree C were reinhardbraunsite and foshagite which was formed from kilchoanite.
Hydration of beta-dicalcium silicate at high temperatures under hydrothermal conditions
Yanagisawa, Kazumichi (Autor:in) / Hu, Xiulan (Autor:in) / Onda, Ayumu (Autor:in) / Kajiyoshi, Koji (Autor:in)
Cement and Concrete Research ; 36 ; 810-816
2006
7 Seiten, 23 Quellen
Aufsatz (Zeitschrift)
Englisch
Hydration of β-dicalcium silicate at high temperatures under hydrothermal conditions
| British Library Online Contents | 2006
Hydration of b-dicalcium silicate at high temperatures under hydrothermal conditions
| Online Contents | 2006
Some hydration studies of α-dicalcium silicate
| Elsevier | 1978