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Equilibria and non-equilibria in the formation of xonotlite and truscottite
AbstractThe conclusions of Roy and Harker (1960) regarding phase equilibria in the silica-rich part of the CaO-SiO2-H2O system are substantially confirmed; in particular, truscottite (C7S12H≈3) coexists stably with silica and aqueous solution from below 200°C to approximately 350°C at saturated steam pressures. However, non-equilibrium situations readily occur in which xonotlite (C6S6H) is formed when truscottite would be expected. These situations are attributed to incongruent solubility of truscottite, coupled with extreme reluctancr or inability of xonotlite to react with silica and aqueous solution to give truscottite. As a result, if xonotlite forms before truscottite it persists, and any process in which silica is effectively removed from the system, however temporarily, can cause a conversion of truscottite into xonotlite that is for practical purposes irreversible and potentially complete. Such loss of silica could occur through liquid or vapor transport, and may be brought about by temperature gradients.
Equilibria and non-equilibria in the formation of xonotlite and truscottite
AbstractThe conclusions of Roy and Harker (1960) regarding phase equilibria in the silica-rich part of the CaO-SiO2-H2O system are substantially confirmed; in particular, truscottite (C7S12H≈3) coexists stably with silica and aqueous solution from below 200°C to approximately 350°C at saturated steam pressures. However, non-equilibrium situations readily occur in which xonotlite (C6S6H) is formed when truscottite would be expected. These situations are attributed to incongruent solubility of truscottite, coupled with extreme reluctancr or inability of xonotlite to react with silica and aqueous solution to give truscottite. As a result, if xonotlite forms before truscottite it persists, and any process in which silica is effectively removed from the system, however temporarily, can cause a conversion of truscottite into xonotlite that is for practical purposes irreversible and potentially complete. Such loss of silica could occur through liquid or vapor transport, and may be brought about by temperature gradients.
Equilibria and non-equilibria in the formation of xonotlite and truscottite
Luke, K. (author) / Taylor, H.F.W. (author)
Cement and Concrete Research ; 14 ; 657-662
1983-10-17
6 pages
Article (Journal)
Electronic Resource
English
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