Effect of supplementary cementitious materials (binder type) on the pore solution chemistry and the corrosion of steel in alkaline environments |
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| Affiliation: | 1. Department of Civil Engineering, University of Canterbury, Private Bag 4800, Christchurch 8140, New Zealand;2. Department of Civil Engineering, University of Cape Town, Cape Town, South Africa;1. Centro di Studi sulla Corrosione e Metallurgia “A. Daccò”, Università di Ferrara, Via Saragat 4a, 44122 Ferrara, Italy;2. Dipartimento di Ingegneria Civile, Chimica, Ambientale e dei Materiali, Università di Bologna, Via Terracini 28, 40131 Bologna, Italy;3. C.I.R.I. (Centro Interdipartimentale Ricerca Industriale) Meccanica Avanzata e Materiali, Università di Bologna, Bologna, Via Terracini 28, 40131 Bologna, Italy;4. Dipartimento di Beni Culturali, Università di Bologna, Via degli Ariani, 1, 48121 Ravenna, Italy;5. Terra&Acqua Tech, Università di Ferrara, Via Saragat 4a, 44122 Ferrara, Italy;1. Department of Materials Science and Engineering, The University of Sheffield, Sir Robert Hadfield Building, Sheffield S1 3JD, United Kingdom;2. Department of Civil and Structural Engineering, The University of Sheffield, Sir Frederick Mappin Building, Sheffield S1 3JD, United Kingdom |
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| Abstract: | The pore solution compositions of paste samples produced with Ordinary Portland Cement (PC), slag 25%, 50% and 75%, fly ash 30%, condensed silica fume (SF) 7%, and a ternary blend of 50% PC, 43% slag and 7% SF were determined. Not only are there significant variations in the concentration of the major cations and anions but also, and equally important from the perspective of development of the passivity of steel in solution, in the level of dissolved oxygen and redox potential.Further, the impact of changes in the pore solution chemistry of cement pastes with SCMs on the passivation and corrosion of steel was investigated with mild steel in simulated pore solutions (SPS). Sulphides and thiosulphates, typically found in slag bearing pastes, appeared to reduce the chloride threshold concentration and increase the rate of corrosion in SPS, which has potential implication for the long term performance of reinforced concrete structures. |
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