본 연구는 실리카 퓸의 대체율을 4단계(시멘트 중량의 0, 5, 10 및 15%)로 달리하여 제조한 시멘트 모르타르의 황산마그네슘 침식 저항성을 평가하며, 침식에 의한 성능저하 원인을 조사하기 위하여 수행되었다. 실리카 퓸 혼합 모르타르를 5% 황산마그네슘 용액에 360일 동안 침지한 후, 재령별 압축강도 및 팽창을 측정하였으며, XRD, SEM 및 DSC와 같은 여러 기기분석법을 활용하여 침식에 의한 시멘트 경화체의 성능저하 원인을 고찰하였다. 실험 결과에 의하면, 실리카 퓸을 혼합한 시멘트 경화체의 황산마그네슘 침식은 주로 gypsum, thaumasite 및 brucite 등의 반응생성물과 깊은 관련이 있는 것으로 나타났다.
This paper reports the effect of replacement levels of silica fume on the resistance to magnesium sulfate attack. Mortar specimens incorporating silica fume were exposed to 5% magnesium sulfate solution for 360 days at ambient temperature. The main variable was the replacement levels of silica fume(0, 5, 10 and 15% of cement by mass). The resistance of mortar specimens incorporating silica fume against magnesium sulfate attack was regularly monitored by measuring compressive strength and expansion. In addition, in order to investigate the reactants formed by magnesium sulfate attack, various instrumental analyses such as XRD, SEM and DSC were used. Results demonstrated that the formation of gypsum, thaumasite and brucite led to a significant deterioration due to magnesium sulfate attack in cement matrix incorporating silica fume.
ASTM C150-00., 'Standard Specification for Portland Cement', American Society for Testing and Materials, 2000
ASTM C1012-95., 'Standard Test Method for Length Change of Hydraulic-Cement Mortars Exposed to a Sulfate Solution', American Society for Testing and Materials, 1995
Cheng-Yi,H. & Feldman, R.F., 'Hydration Reactions in Portland Cement-Silica Fume Blends', Cement and Concrete Research, Vol. 15, No. 4, 1985, pp. 585-592
Al-Amoudi.O.S.B., 'Studies on Soil-Foundation Interaction in the Sabkha Environment of Eastern Province of Saudi Arabia', Ph.D. Dissertation, King Fahd University, Saudi Arabia, 1992
ASTM C109-99., 'Standard Test Method for Compressive Strength of Hydraulic Cement Mortars', American Society for Testing and Materials, 1999
Bonen,D.A., 'Microstructural Study of the Effect Produced by Magnesium Sulfate on Plain and Silica Fume-Bearing Portland Cement Mortars', Cement and Concrete Research, Vol. 23, No. 3, 1993, pp. 541-553
Hooton.R.D. & Titherington.M.P., 'Chloride Resistance of High-Performance Concretes Subjected to Accelerated Curing', Cement and Concrete Research, Vol. 34, No. 9, 2004, pp. 1561-1567
Wee.T.H et al., 'Sulfate Resistance of Concrete Containing Mineral Admixtures', ACI Materials Journal, Vol. 97, No. 5, 2000, pp. 536-549
Cohen.M.D & Bentur.A., 'Durability of Portland Cement-Silica Fume Pastes in Magnesium Sulfate and Sodium Sulfate Solutions', ACI Materials Journal, Vol. 85, No. 3, 1988, pp. 148-157
Yazici.H., 'The Effect of Silica Fume and High-Volume Class C Fly Ash on Mechanical Properties, Chloride Penetration and Freeze-Thaw Resistance of Self-Compacting Concrete', Construction and Building Materials, Vol. 22, No. 4, 2008, pp. 456-462
Al-Amoudi.O.S.B., 'Attack on Plain and Blended Cements Exposed to Aggressive Sulfate Environments', Cement and Concrete Composites, Vol. 24, No. 3, 2002, pp. 305-316
Kayali.O. & Zhu.B., 'Corrosion Performance of Midium-Strength and Silica Fume High- Strength Reinforced Concrete in a Chloride Solution', Cement and Concrete Composites, Vol. 27, No. 1, 2005, pp. 117-124
이 논문을 인용한 문헌 (1)
Kim, Tae-Wan 2013. "Influence of Silica Fume on Strength Properties of Alkali-Activated Slag Mortar" 콘크리트학회논문집 = Journal of the Korea Concrete Institute, 25(3): 305~312