The Transactions of The Korean Institute of Electrical Engineers (전기학회논문지)

The Korean Institute of Electrical Engineers (대한전기학회)
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Effect on the Corrosion of Steel by Unburnt Carbon in Fly Ash Cement Mortar

미연탄소분이 플라이 애시 시멘트 모르타르 내 철근의 부식에 미치는 영향

  • 하태현 (한국전기연구원 전력연구단) ;
  • 배정효 (한국전기연구원 전력연구단) ;
  • 김대경 (한국전기연구원 전력연구단) ;
  • 이현구 (한국전기연구원 전력연구단) ;
  • 하윤철 (한국전기연구원 전력연구단)
  • Published : 2007.02.01
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Abstract

The increase of activated carbon contents in fly ashes accelerate the corrosion of steel embedded in ordinary portland cement(OPC) mortar. Cement losses its identity of colour when the % of carbon is increased. More than 60[%] area was rusted when carbon content is increased beyond 8[%] for the exposure period of one year. Comparable corrosion rate with OPC was obtained up to 6[%] carbon level only. The tolerable limit of replacement for various admixed carbon system under aggressive alternate wetting and drying condition with 3[%] NaCl was found to be 6 to 8[%].

Keywords

References

  1. Kumar Mehta P, Paulo JM., 'Concretemicrostructure, properties and materials'. Monteiro, Indian Concrete Institute, 1999
  2. Muralidharan S, Saraswathy V, Thangavel K, Srinivasan S., 'Competitive role of inhibitive and aggressive ions in the corrosion of steel in concrete', J Appl Electrochem, vol. 30, pp. 1255-1259, 2000 https://doi.org/10.1023/A:1026570120698
  3. 이태식, 분차석, 김경석, 남창우, 이규철, ' 석탄연소 보일러용 분진의 전기집진특성' , 대한전기학회논문지, 제48C권, 6호, pp.475-482, 1999. 6
  4. Saraswathy V, Muralidharan S, Thangavel K, Srinivasan S., 'Activated fly ash cements: tolerable limit of replacement for durable steel reinforced concrete', Adv Cement Res, vol. 14, pp. 9-16, 2002 https://doi.org/10.1680/adcr.2002.14.1.9
  5. Wesche K, editor., Fly ash in concrete: properties and performance, report of technical committee67- FAB, E&EN spon, London, 1991
  6. Osbaeck B., In: Proceedings of the second CANMET/ACI, international conference on fly ash, silica fume, slag and natural pozzolans in concrete, Madrid, Spain, 1986
  7. Dhir RK, Hubbard FH, Munday JGL, Jones MR, Duerden SL., 'Contribution of PFA to concrete workability and strength development', Cement Concrete Res, vol. 18, pp. 277-289, 1988 https://doi.org/10.1016/0008-8846(88)90012-9
  8. Hornain H, Miersman F, Marchand J., In: Proceedings of the 4th CANMET/ACI international conference on fly ash, silica fume and slag and natural pozzolans in concrete, Istanbul, Turkey, 1992
  9. Bloem PJC, Sciarone BJG., In: Proceedings of the 5th CANMET/ ACI international conference of fly ash, silica fume, slag and natural pozzolans in concrete, Milwaukee, USA, 1995
  10. Mehta PK., In: Proceedings of the second CANMET/ ACI international conference on fly ash, silica fume, slag and natural pozzolans in concrete, Madrid, Spain, 1986
  11. Hurt RH, Gibbins JR., 'Residual carbon from pulverized coal fired boilers: size distribution and combustion reactivity', Fuel, vol. 74, pp. 471-480,1995 https://doi.org/10.1016/0016-2361(95)98348-I
  12. Elizabeth Freeman, Yu-Ming Gao, Robert Hurt, Eric Suuberg, 'Interactions of carbon containing fly ash with commercial air-entraining admixtures for concrete', Fuel, vol. 76, pp. 761-765, 1997 https://doi.org/10.1016/S0016-2361(96)00193-7
  13. Paya' J, Monzo' J, Borrachero MV, Perris E, Amahjour F., 'Thermogravimetric methods for determining carbon content in fly ashes', Cement Concrete Res, vol. 28, pp. 675-686, 1998 https://doi.org/10.1016/S0008-8846(98)00030-1
  14. Varey JE., 'Source determination and reactivity of unburnt carbon in fly ash', Coal Sci Technol, vol. 24, pp. 643-646, 1995
  15. Standard test method for half-cell potentials of uncoated reinforcing steel in concrete, ASTM: C876-1994
  16. Muralidharan S, Saraswathy V, Merlin Nima SP, Palaniswamy N., 'Evaluation of a composite corrosion inhibiting admixtures and its performance in Portland pozzolona cement', Mater Chern Phys, vol. 86, pp. 298-306, 2004 https://doi.org/10.1016/j.matchemphys.2004.03.025