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2000 Fiscal Year Final Research Report Summary

Characterization and Steel Corrosion of Cement Produced from Incinerator Ashes

Research Project

Project/Area Number 11650465
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 土木材料・力学一般
Research InstitutionKanazawa University

Principal Investigator

TORII Kazuyuki  Kanzawa University, Civil Engineering, Professor, 工学部, 教授 (50115250)

Co-Investigator(Kenkyū-buntansha) IGARASHI Shinich  Kanzawa University, Civil Engineering, Associate Professor, 工学部, 助教授 (50168100)
KAWAMURA Mitsunori  Kanzawa University, Civil Engineering, Professor, 工学部, 教授 (20019730)
Project Period (FY) 1999 – 2000
KeywordsIncinerator Ashes / Ecocement / Carbonation / Steel Corrosion / Combined Deterioration / Electrochemical Measurement / AC Impedance / Fly Ash
Research Abstract

Ecocement is a new type of hydraulic cement produced from incinerator ash. However. the incinerator ash contains large amounts of chloride, which, if not removed during the production process, is expected to accelerate the corrosion of steel bars when ecocement is used in reinforced concrete structures. The chlorides can be removed in the production process but at a high cost. Two types of ecocement have been produced, a high chloride type (type I) and a low chloride (type II). This paper investigates the corrosive behavior of steel bars embedded in the mortars containing both types of ecocement, cured under and exposed to wetting and drying cycles. Corrosion of the mild steel bars was monitored by halfcell potential, polarization resistance, and AC impedance measurements. The relative performance of the two types of ecocements with respect to the corrosive behavior of the embedded steel bars was discussed.
From the results, the following conclusions could be drawn.
(1) Steel bars embedded in mortars of high-chloride type ecocement is more susceptible to corrosion than that of low-chloride type one.
(2) Carbonation accelerates corrosion of steel bars embedded in the mortars of both ecocements, although the effect is higher in high-chloride type than in low-chloride type.
(3) Electrical measurement yields a good result in the monitoring of corrosion of steel bars embedded in cement mortars.
(4) In both types of ecocement, the extent and severity of the corrsion of the embedded steel bars depend on the water to cement ratio, the higher the water to cement ratio, the greater the severity of corrosion.

  • Research Products

    (11 results)

All Other

All Publications (11 results)

  • [Publications] Ampadu,O.K,Torii,K.: "Beneficial Effect of Fly Ash on Chloride Diffusivity of Hardened Cement Paste"Int.J.of Cement and Concrete Research. Vol.29,No.4. 585-590 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Ampadu,O.K.,Kubota,T.,Ito,E.,Torii,K.: "A Study on the Corrosive Behavior of Steel Bars in Ecocement-Blastfurnace Slag Mortars"コンクリート工学年次論文報告集. Vol.22,No.2. 1003-1008 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Ampadu,O.K.,Torii,K.: "Monitoring of Chloride Induced Corrosion of Rebars Embedded in Ecocement Mortars"Proc.of Inter.Conf.on Infrastructure Regeneration and Rehabilitation. 543-552 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Ampadu,O.K.,Torii,K.,Kubota,T.,Echigo,T.: "Corrosive Behavior of Steel Bars Embedded in Cement Mortars Using Different Types of Ecocement"コンクリート工学年次論文集. Vol.23,No.1. 157-162 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Ampadu,O.K.,Kabota,T.,Torii,K.: "The Beneficial Effect of Blast-Furnace Slag on Chloride Induced Corrosion of Steel Bars Embedded in Mortars"Proc.of 6th Inter.Conf.on Structural Failure, Durability and Retrofitting. 157-164 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 鳥居和之,Ampadu,O.K.,久保田貴史,越後卓也: "都市ゴミ焼却灰から製造されたセメントを用いたモルタルにおける鉄筋腐食性状"センメト・コンクリート論文集. No.54. (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Ampadu, O.K., Torii, K.: "Beneficial Effect of Fly Ash on Chloride Diffusivity of Hardened Cement Paste"Int.J.of Cement and Concrete Research. Vol.29, No.4. 585-590 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Ampadu, O.K., Kubota, T., Ito, E., Torii, K.: "A Study on the Corrosive Behavior of Steel Bars in Ecocement-Blastfurnace Slag Mortars"Proc.of Japan Concrete Institute. Vo.22-2. 1003-1008 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Ampadu, O.K., Torri, K.: "Monitoring of Chloride Induced Corrosion of Rebars Embedded in Ecocement Mortars"Proc.of Inter.Conf.on Infrastructure Regeneration and Rehabilitation. 543-552 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Ampadu, O.K., Torii, K., Kubota, T., Echigo, T.: "Corrosive Behavior of Steel Bars Embedded in Cement Mortars Using Different Types of Ecocement"Proc.of Japan Concrete Institute. Vo.23-1. 157-162 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Ampadu, O.K.Kubota, K., Torii, K.: "The Benificial Effect of Blast-Furnace Slag on Chloride Induced Corrosion of Steel Bars Embedded in Mortars"Proc.of 6^<th> Int.Conf.on Structural Failure, Durability and Retrofitting. 157-164 (2000)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2002-03-26  

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