Sulfate Durability Of Mortars Produced With And Without Natural Zeolite And Fly Ash
Abstract
An investigation was carried out on the effect of sodium sulfate on the sulfate durability of mortars produced with natural zeolite and fly ash having puzzolanic character. Experiments were carried out on the Rilem portland cement standart mortars and cement – natural zeoılite mortars where the zeolite replaced 20 %, 30 %, 15 % zeolit + 5 % fly ash and 25 % + 5 % fly ash of the cement by weight. Sodyum sulfate concentrations were 5 % and 10 %. Sulfate exposures of mortars were initiated after 28 days of lime saturated water curing. Flexural strength, compressive strength and density were determined at the beginning of exposure and at the 2, 7, 28, 90th days. Water and solutions were renewed after each period of experimental time which was 14 days. Mass changes were determined at the time of renewing the solutions. The effects of sodium sulfate solutions on the properties of mortars were related to the zeolite ratio. Zeolite replacement caused significant increase in sulfate durability of mortars even at the highest sulfate concentration up to 90 days of exposure.
Keywords
Natural zeolite,fly ash,durability,cement additives,sulfate attacks
Kaynakça
- [1] K. Sarıiz, İ. Nuhoğlu, “Endüstriyel Hammadde Yatakları ve Madenciliği”, Anadolu Üniversitesi. Yayın No:636, Eskişehir, 1992.
- [2] E. Erdem, R. Donat, H. Çetişli, “Hydration and Mechanical Properties of Cement Containing Zeolite”. Cement and Concrete World , No:17, 22-28, Ankara, 1999.
- [3] P. K. Mehta, “Efects of Fly Ash Composition on Sulfate Resistance of Cement”. ACI Journal, V. 83, 994-1000, 1986.
- [4] P. S. Mangat and J. M. El-Khatip, “Influence of Initial Curing on Sulfate Resistance of Blended Cement and Concrete”. Cem. Concr. Res. V. 22, 1089- 1100, 1992.
- [5] R. D. Hooton, and J. J.Emery , “Sulfate Resistance of a Canadian Slag Cement”. ACI Materials Journa, 87, 547-555, 1990.
- [6] P. J. Tikalsky and R. L. Carrasquillo, “Influence of Fly Ash on The Sulfate Resistance of Concrete”. ACI Materials Journa, 89, 69-75, 1993.
- [7] E. F. Irassar, A. Di Maio, O. R.Batic ”Sulfate Attack on Concrete with Mineral Admixtures”. Cem. Concr. Res. Vol. 26, No. 1, pp. 113-123, 1996.
- [8] H. Biricik, F. Aköz, “Sodyum Sülfat Çözeltisinin Buğday Sapı Külü Katkılı ve Katkısız Harçlara Etkisi”. Çimento ve Beton Dünyası, Yıl 5. Sayı 26 (11-17), Ağustos, 2000.
- [9] A. M. Neville, “Properties of Concrete Pitman Publishing”, Singapore, 443-451, 1990.
- [10] M. D. Cohen, A. Bentur, “Durability of Portland Cement Silica Fume Pastes in Magnesium Sulfate and Sodium Sulfate Solutions”. ACI Journal, V. 5, N. 3, May-june, pp 148-157, 1988.