Chemiczna aktywacja naturalnej pucolany za pomocą stałego aktywatora

• Autorzy: Allahverdi A. , Rahmani A.

Warianty tytułu

EN

Chemical activation of natural pozzolan with a solid compound activator

• Języki publikacji: PL

Abstrakty

PL

Otrzymano spoiwo złożone w 77% z naturalnej pucolany pumeksowej, a w 23% z aktywatora zawierającego ponad 90% cementu portlandzkiego i niewielkie ilości substancji chemicznych złożonych z siarki i metali alkalicznych. Zbadano właściwości zaczynu i zapraw sporządzonych z tego spoiwa. Czas wiązania był zawarty w granicach od 210 minut (początek wiązania) do 300 minut (koniec wiązania). Wytrzymałość zaprawy wzrastała z około 23 MPa po 28 dniach do 45 MPa po rocznym dojrzewaniu. Badania wykazały, że opracowany aktywator pozwala na otrzymanie dobrej jakości spoiwa z naturalnej pucolany pumeksowej. Jest to spoiwo niezwykle przyjazne dla środowiska.

EN

The binder was produced consisting of 77% of natural pozzolana pumice-type and 23% of activator composed chiefly of Portland cement and small addition of chemical substances containing sulfure and alkali metals. The properties of paste and mortars prepared on the basis of this binder were investigated. Setting time of the binder was the range from 210 min (beginning of setting) to 300 minutes (final setting time). The compressive strength was 23 MPa after 28 days of hardening till 45 MPa after one year of curing. The experimental results showed that the elaborated activator gives the possibility for producing good quality binder from natural puzzolana of pumice-type. This binder is very environmental friendly.

Słowa kluczowe

PL

pumeks; pucolana naturalna; spoiwo pucolanowe; aktywacja; zaprawa pucolanowa; właściwości techniczne

EN

pumice; natural pozzolana; pozzolanic cement; activation; pozzolanic mortar; properties

• Wydawca: Fundacja Cement, Wapno, Beton
• Czasopismo: Cement Wapno Beton
• Rocznik: 2009
• Tom: R. 14/76, nr 4
• Strony: 205--213
• Opis fizyczny: Bibliogr. 23 poz., il.

Twórcy

autor

Allahverdi A.

autor

Rahmani A.

• Cement Research Center, School of Chemical Engineering, Iran University of Science and Technology, Tehran

Bibliografia

• 1. F. M. Lea, The Chemistry of Cement and Concrete, third edition, Edward Arnold, London, 1974.
• 2. C. Shi and R. L. Day, Comparison of different methods for enhancing reactivity of pozzolans, Cement and Concrete Research, 31, pp. 813-818, (2001).
• 3. B. Uzal and L. Turanli, Studies on blended cements containing a high volume of natural pozzolans, Cement and Concrete Research, 33, pp. 1777-1781, (2003).
• 4. R K. Mehta and P. J. Monteiro, Concrete, Microstructure, Properties, and Materials, Prentice Hall, Englewood Cliffs, NJ, 1993.
• 5. R. C. Mielenz, L. P. Witte, and O. J. Glantz, Effect of calcination on natural pozzolans, Proceedings of Symposium on Use of Pozzolanic Materials, Philadelphia, PA, USA, pp. 43-91, (1949).
• 6. G. Rossi and L. Forchielli, Porous structure and reactivity of some natural Italian pozzolans with lime, Cemento, 73, pp. 215-221, (1976).
• 7. U. Costaand F. Massazza, Influence of thermal treatment on the activity of some natural pozzolans with lime, Cemento, 73, pp. 105-122, (1977).
• 8. S. Techner, The texture and surface area of kieselguhrs after various treatments, CIay Miner. Bull., 1, pp. 145-150, (1951).
• 9. K. M. Alexander, Activation of pozzolanic materials with acid treatment, Aust. J. Appl. Sci., 6, pp. 224-229, (1955).
• 10. R. T. Hemmings, E. E. Berry, B. J. Comelius, and D, M. Golden, Evaluation of acid-leached fly ash as a pozzolan, Proc. Master. Res. Soc., 136, pp. 141-161, (1989).
• 11. K. M. Alexander, Reactivity of ultra fine powders produced from siliceous rocks, J. Am. Concr. Inst, 57, pp. 557-569, (1960).
• 12. M. K. Chatterjee and D. Lahiri, Pozzolanic reactivity in relation to specific surface of some artificial pozzolans, Trans. Indian Cerarn. Soc., 26, pp. 65-74, (1967).
• 13. M. Collepardi, A. Marcialis, L. Massida, and U. Sanna, Low pressure steam curing of compacted lime-pozzolan mixtures, Cem. Concr. Res., 6, pp. 497-506, (1976).
• 14. K. M. Alexander and J. Wardlaw, Limitations of the pozzolan-lime mortars strength test as method of comparing pozzolanic reactivity, Aust. J. Appl. Sci., 6, pp. 334-342, (1955).
• 15. K. M. Alexander, Activation of pozzolanic rnaterials by alkali, Aust. J. Appl. Sci., 6, pp. 224-229, (1955).
• 16. R. L. Day and C. Shi, Activation of natural pozzolans for increased strength of low-cost masonry units, Proceedings of 6th Canadian Masonry Symposium, Saskatoon, pp. 499-507, (1992).
• 17. Allahverdi A. and Škvara, F., Fly ash-based geopolymer cement, Binding Geopolymeric Mixtures, Czech Patent No. 291443, filled on: January 10, 2003.
• 18. Allahverdi A. and Škvára F., Development of an Acid-Resistant Geopolymeric Cement, International Congress of Chemical and Process Engineering 16th (CHISA2004), Prague, Czech Republic, 22-26 August, 2004.
• 19. Allahverdi A., Mehrpour K., and Najafi Kani E., lnvestigating the Possibility of Utilizing Pumice-Type Natural Pozzolan in Production of Geopolymer Cement, Ceramics-Silikáty 52 (1), pp. 16-23, 2008.
• 20. John L. Provis, Chu Zheng Yong, Peter Duxson, and Jannie S.J. van Deventer, Correlating mechanical and thermal properties of sodiurn silicate-fly ash geopolymers, Colloids and Surfaces A: Physicochemical and Engineering Aspects, Volume 336, Issues 1-3, pp. 57-63, 2009.
• 21. Prinya Chindaprasirt, Chai Jaturapitakkul, Wichian Chalee, and Ubolluk Rattanasak, Comparative study on the characteristics of fly ash and bottom ash geopolymers, Waste Management, Volume 29, Issue 2, pp. 539-543, 2009.
• 22. Peter Duxson, John L. Provis, Grant C. Lukey, Seth W. Mallicoat, Waltraud M. Kriven, and Jannie S.J. van Deventer, Understanding the relationship between geopolymer composition, microstructure and mechanical properties, Colloids and Surfaces A: Physicochemical and Engineering Aspects, Volume 269, Issues 1-3, pp. 47-58, 2005.
• 23. P. Forquin, A. Arias, and R. Zaera, Role of porosity in controlling the mechanical and impact behaviours of cement-based materials International Journal of Impact Engineering, Volume 35, Issue 3, pp. 133-146, 2008.