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Conditions of thaumasite formation
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Abstrakty
Zbadano wpływ stosunku molowego C/S w fazie C-S-H na proces powstawania thaumasytu. W tym celu przygotowano C-S-H o różnym stosunku C/S oraz sporządzono mieszaniny tej fazy z wodorotlenkiem wapnia, węglanem wapnia i siarczanem sodu. Mieszaniny te przechowywane w wilgotnej atmosferze wykazały, że thaumasyt powstaje w 5°C w mieszaninach zawierających C-S-H o stosunku molowym C/S > lub równe 1,5. W przypadku fazy C-S-H o C/S = 0,8 thaumasyt nie powstaje. Natomiast w 20°C powstawanie thaumasytu jest bardzo powolne i po 720 dniach stwierdzono bardzo małą zawartość tej fazy, szczególnie w próbkach zawierających C-S-H o C/S > lub równe 1,5.
The effect of C/S molar ratio in C-S-H on the process of thaumasite formation was investigated. The C-S-H samples of variable C/S molar ratio, as well as the mixtures of C-S-H with calcium hydroxide, calcium carbonate and sodium sulfate respectively, were prepared. In the mixtures stored in humid air, based on C-S-H with C/S > 1,5 thaumasite appeared at 5°C. In case of C-S-H with C/S = 0,8 thaumasite was not detected. At 20°C the formation of thaumasite occurs very slowly; after 720 days curing a negligible amount of this ph samples where C-S-H with C/S > 1,5 was initially present.
Wydawca
Czasopismo
Rocznik
Tom
Strony
93--101
Opis fizyczny
Bibliogr. 39 poz., il.
Twórcy
autor
autor
- Katedra Technologii Materiałów Budowlanych, Wydział Inżynierii Materiałowej i Ceramiki, Akademia Górniczo-Hutnicza
Bibliografia
- 1. A.M. Neville, "Properties of Concrete", London 1997.
- 2. H. F. W. Taylor "Cement chemistry", Academic Press, London 1990.
- 3. R.E. Oberholster, l.H. Van Aardt, M. Brandt, "Structure and Performance of Cements", Appl. Science Publ., s. 363, London 1983.
- 4. D.M. Roy, 8th ICCC Rio de Janeiro, 11, s. 362, 1986.
- 5. Thaumasite Expert Group "The thaumasite from of sulfate attack: Risks, diagnosis, remedial works and guidance on new construction. Report of the Thaumasite Expert Group", DETR, Londyn, 1999.
- 6. Thaumasite Expert Group "Thaumasite form of sulfate attack", Concrete Nr 2, s.37-40,1999.
- 7. J. Bensted, S.P. Varma, "Studies of Thaumasite", Sil. Ind. T 2, 1973.
- 8. J. Bensted, S.P. Varma, "Studies of thaumasite, part II", Sil. Ind. T 39,1974.
- 9. P.W. Brown, "Thaumasite formation and other forms of sulfate attack", Cement and Concrete Composites 24, s. 301-303, 2002.
- 10. S. Chłądzyński, "Wpływ obniżonej temperatury na odporność zapraw z cementów z dodatkami mineralnymi na korozję siarczanową", Cement-Wapno-Beton, R. X/LXXII, nr 4, s. 204 - 214, 2005.
- 11. D.W. Hobbs, M.G. Taylor, "Nature of the thaumasite sulfate attack mechanism in field concrete", Cement Concrete Research 30, s. 529-533, 2000.
- 12. S. Hartshorn, l. Sims, "Thaumasite - a brief guide for engineers", Concrete Nr 10, s. 24-27, 1998.
- 13. M. Berra, G. Baronio, "Thaumasite in Deteriorated Concretes in Presence of Sulfates", Concrete Durability sp. 100 -106, s. 2073 - 2089, 1985.
- 14. I. Papayianni, "Durability lessons from the study of old mortars and concretes", P. K. Mehta Symposium on Durability of Concrete, Nice 1994.
- 15. AL Baghabra, O. S. Amoudi, "Attack on plain and blended cements exposed to aggressive sulfate environments", Cement and Concrete Composites 24, s. 305-316,2002.
- 16. M. Schneider, S. Puntke, M. M. Sylla, K. Lipus," The influence of cement on the sulfate resistance of mortar and concrete", Cement International 1, s. 131-148, 2002.
- 17. S. Goto, M. Daimon, G. Hosaka, R. Kondo, "Composition and morphology of hydrated tricalcium silicate", J Am Ceram Soc 59(7/8), s. 281-284,1976.
- 18. H.F. W. Taylor, "The Calcium Silicate Hydrates", Proceedings of the 4th International Symposium on the Chemistry of Cement, Washington 1960, s 1-36, 1962.
- 19. W. Nocuń-Wczelik, "Structure and properties of calcium silicate hydratem", Polish Ceramic Bulletin No 18,1999 (in Polish).
- 20. S.A. Greenberg, T.N. Chang, "The hydration of Tricalcium Silicate", The Journal of Physical Chemistry, Vol 69, 2, s. 553-561, 1965.
- 21. S.A. Greenberg, T.N. Chang, E. Andersen, "lnvetigation of the Colloidal Hydrated Calcium Silicates. l. Solubility Products", The Journal of Physical Chemistry, Vol 64, s. 1151-1156, 1960.
- 22. S.A. Greenberg, T.N. Chang, "lnvetigation of the Colloidal Hydrated Calcium Silicates. II. Solubility Relationships in the Calcium Oxide-Silica-Water System at 25°C", The Journal of Physical Chemistry, Vol 69, 1, s. 183-188, 1965.
- 23. G.L. Kalousek, J.S. Logiudice, V.H. Dodson, "Studies on the Lime-Rich Crystaline Solid Phases in the System Lime-Silica-Water", J. Am. Ceram. Soc., 37, s. 7-13, 1954.
- 24. D.M. Roy, "Studies in the system CaO-AI2O3-SiO2-H2O IV: Phase equilibria in the high-lime portion of the system CaO-SiO2-H2O", The American Mineralogist, Journal of the Mineralogical Society of America, Vol. 43, s. 1009-1028, 1958.
- 25. A. Nonat, A.C. Courault, D. Damidot, "Nowy model opisujący zmiany stosunku Ca/Si w C-S-H ze zmianami stężenia CaO w roztworze", CWB nr 5, s. 184-191, 2001.
- 26. I.G. Richardson, "The nature of C-S-H in hardened cements", Cement and Concrete Research 29, s.1131-1147, 1999.
- 27. T. Thorvaldson, F. W. Birss, McCurdy K.G., "Calcium Exchange in Systems of xCaO-SiO2-yH2O-Ca(OH)2-H2O", Proceedings of the 4th International Symposium on the Chemistry of Cement, Washington 1960, s. 315-320,1962.
- 28. H. F. W. Taylor, "Hydrated calcium silicates: part l. Compound formation at ordinary temperatures", J. Chem. Soc., s. 3682-3690, 1950.
- 29. L. Heller, H. F. W. Taylor, "Hydrated calcium silicates: part 2. Hydrothermal reactions: lime:silica ratio 1:1", J. Chem. Soc., s. 2397- 3401, 1951.
- 30. L. Heller, H. F. W. Taylor, "Hydrated calcium silicates: part 3. Hydrothermal reactions of mixture of lime:silica molar 3:2", J. Chem. Soc., s. 1018-1019, 1952.
- 31. L. Heller, H. F. W. Taylor, "Hydrated calcium silicates: part 4. Hydrothermal reactions lime:silica ratios 2:1 and 3:1", J. Chem. Soc., s. 2535-2541, 1952.
- 32. H.F. W. Taylor, "Hydrated calcium silicates: part 5. The water content of calcium silicate hydrate (l)", J. Chem. Soc., s. 163-171, 1953.
- 33. H.F.W. Taylor, "Hydrothermal Reaction in the System CaO-SiO2-H2O and the Steam Curing of Cement and Cement-Silica Products", Proceedings of the 4th International Symposium on the Chemistry of Cement, Washington 1960, s 167-203, 1962.
- 34. S. Brunauer, S. A. Greenberg, "The Hydration of Tricalcium Silicate and (ß-Dicalcium Silicate at Room Temperature", Proceedings of the 4th International Symposium on the Chemistry of Cement, Washington 1960, s 135-165, 1962.
- 35. W. Kurdowski, S. Duszak, B. Trybalska, "Belite Produced by Means of Low-Temperature Synthesis", Cement and Concrete Research 27, s. 51-62, 1997.
- 36. J. Skibsted, H. Hjorth, H. J. Jakobsen, "Quantification of thaumasite In cementitious materiał by 29Si [1H] cross-polarization magic-angle spinning NMR spectroscopy", Adv. Cem. Res. S. 69-83, 7, 1995.
- 37. J. Małolepszy, R. Mróz, "The conditions of thaumasite formation and its role in concrete", Proceedings of 11th International Congress on the Chemistry of Cement, Durban, South Africa, s. 1487-1496, 2003.
- 38. R. Mróz, "Warunki tworzenia taumazytu (CaSiO3-CaCCyCaSCv15H2O) w stwardniałym zaczynie cementowym", Praca Doktorska, AGH Kraków 2004.
- 39. W. Kurdowski, "Chemia cementu", Wydawnictwo Naukowe PWN, Warszawa 1991.
Typ dokumentu
Bibliografia
Identyfikator YADDA
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