THE EFFECT OF TEMPERATURE ON THE PITTING CORROSION OF IRON IN OPC MORTARS . PROCEEDINGS OF 3RD INTERNATIOAL CONFERENCE ON DETERIORATION AND REPAIR OF REINFORCED CONCRETE IN THE ARABIAN GULF, BAHRAIN, OCTOBER 21-24 1989. VOLUME 1.

This work examines the pitting behaviour of a very low carbon Swedish iron in ordinary Portland cement (OPC) mortar containing chloride admixtures and in alkaline chloride solutions of similar pH to the cement pore water. The iron samples were embedded in mortar so that the curved surface and one end were exposed to the mortar environment. Mortars were mixed from silver sand, OPC and distilled water with a constant aggregate : cement ratio of 0.5. Additions of 'Analar' sodium chloride to levels of 0.5, 1.0, 2, 3, 4, 5 and 6% by weight of cement were made in different experiments, by addition to the mix water. The mortar was aired for 25 days sealed in polythene bags. During testing, the samples were partially immersed in saturated calcium hydroxide solution to maintain saturation and to provide a conducting medium. For comparison, a parallel series of tests were carried out in 0.2 M sodium hydroxide solutions containing different levels of chloride addition. Three temperatures were chosen: 0, 20 and 40 degrees C. Tests were carried out under potentiodynamic control using a simple integrator circuit to generate a smooth potential ramp as signal for the potentiostat. A scan rate of 10 mV per minute was used. The results show that temperature has a marked influence on both pitting potential and the critical chloride level needed to cause pitting, both in alkaline solutions and in cement mortars. For the covering abstract of the conference see IRRD 828897.

  • Corporate Authors:

    BAHRAIN SOCIETY OF ENGINEERS

    PO BOX 835
    Manama,   Bahrain 
  • Authors:
    • Benjamin, S E
    • Sykes, J M
  • Publication Date: 1989

Language

  • English

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Filing Info

  • Accession Number: 00604105
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Feb 28 1991 12:00AM