Diffusion of Chloride Ions in the Pastes and Mortars Containing Ground Granulated Blast Furnace Slag

• Autorzy: Deja J. , Łój G.
• Języki publikacji: EN

Abstrakty

EN

The chloride corrosion is one of the seriously harmful processes leading to the destruction of con crete structure. Aparat from the chemical attack on the concrete cover, the chloride ions show their aggres sive action on the steel reinforcing elements. The high resis tance of slag cementitious materials has been proved in many earlier works. In the presented study the au thors give a confrontation of results on the durability of Portland cement, slag cement with 60% granulated blast furnace slag and alkali acti vated slag cement. The mortars were stored in NaCl, MgCl2 and CaCl2 solutions respectively. Aparat from the strength tests, the phase composition studies using XRD and SEM were carried out. The effective diffusion coefficients of Cl– ions, originating from NaCl, MgCl2 or CaCl2, were measured for the Portland cement and slag mortars. The significantly higher corrosion resistance of slag cementitious mortars has been thus proved. It has been also shown that the rate of corrosion process was closely correlated with the type of accompanying cation in chloride solution. The progress of corrosion was the most evident in the presence of Mg2+ ion, the slow est corrosion was observed in the presence of sodium.

Słowa kluczowe

EN

Portland cement; slag cement; alkali activated slag binder; chloride ions diffusion; chloride corrosion

• Wydawca: Polskie Towarzystwo Chemiczne
• Czasopismo: Polish Journal of Chemistry
• Rocznik: 2009
• Tom: Vol. 83, nr 8
• Strony: 1471--1479
• Opis fizyczny: Bibliogr. 11 poz., rys.

Twórcy

autor

Deja J.

autor

Łój G.

• Faculty of Materials Science and Ceramics, AGH University of Science and Technology, 30-059 Cracow, A. Mickiewicza 30 Av., Poland,

Bibliografia

• 1. Deja J., Małolepszy J. and Jaśkiewicz G., Influence of Chloride Corrosion on the Durability of Rein-forcement in the Concrete, 2nd Int. Conf. "Durability of Concrete", Montreal, 1991, vol. I, pp. 511-526.
• 2. Kurdowski W., Cement Chemistry, PWN Warsaw, 1991 (in Polish).
• 3. Małolepszy J. and Deja J., Cement Wapno Gips, 54, 88 (1987) (in Polish).
• 4. Deja J., Chloride Resistance of the Pastes and Mortars Containing Mineral Additives, 10th ICCC Gothenburg vol. 4 iv015, Gothenburg (1997).
• 5. Bijen J., Blast Furnace Slag Cement, Publisher: Beton Prisma, The Netherlands, 1996.
• 6. Deja J. and Łój G., Effect of cations occurring in the chloride solutions on the corrosion resistance of slag cementitious materials, Proceedings of International Conference "Infrastructure Regeneration and Rehabilitation Improving the Quality of Life Through Better Construction", p. 603, Sheffield (1999).
• 7. Deja J., Polish Ceramic Bulletin, 83, 378 (2004) (in Polish).
• 8. Hetmańczyk M., Bases of the Material Science, Publisher: Silesian University of Technology, Gliwice, 1996 (in Polish).
• 9. Pigoń K. and Róziewicz Z., Physical Chemistry, vol. 1, PWN Warsaw, 1993 (in Polish).
• 10. Staronka A., Physical Chemistry, Publisher: AGH University of Science and Technology, Kraków, 1994 (in Polish).
• 11. Ushiyama H. and Goto S., Diffusion of Various Ions in Hardened Portland Cement Paste, 6th ICCC Moscow vol. II/l,p. 331 (1974).