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The Effect of Blast Furnace Slag on the Microstructure of the Cement Paste/Steel Interface

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Abstract

The microstructures of steel reinforced ordinary Portland cement mortar samples, and those containing 40% and 70% slag as cement replacement, have been studied by electron optical techniques, after exposure to stagnant sea-water at 23°C for 320 days. Fracture surfaces along the interface with steel were examined using secondary electron imaging in the SEM. This revealed differences between the OPC and slag specimens as regards the morphology of the phases and the amounts of calcium hydroxide present. The microstructure at the interface with steel was studied by means of back scattered electron imaging combined with quantitative image analysis. Chloride concentrations at sections around the interface were determined by means of an EDXA facility linked to the SEM. Even after 320 days immersion in sea-water, there was some calcium hydroxide present in the interfacial zone.

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Authors and Affiliations

  1. Department of Materials, Imperial College of Science & Technology, Prince Consort Road, SW7 2BP, London, UK

    O. A. Onabolu & P. L. Pratt

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  1. O. A. Onabolu
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  2. P. L. Pratt
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Onabolu, O.A., Pratt, P.L. The Effect of Blast Furnace Slag on the Microstructure of the Cement Paste/Steel Interface. MRS Online Proceedings Library 113, 271–277 (1987). https://doi.org/10.1557/PROC-113-271

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  • DOI: https://doi.org/10.1557/PROC-113-271

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