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GOWRIPALAN, N.; MOHAMED, H. M. Chloride ion penetration and reinforcement corrosion in high performance concrete (HPC) containing silica fume. In: INTERNATIONAL CONGRESS ON HIGH-PERFORMANCE AND QUALITY OF CONCRETE STRUCTURES, 1996, Florianópolis. Anais... Florianópolis, 1996. p. 445-455.
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Dados do autor na base InfoHab:
Número de Trabalhos: 1 (Com arquivo PDF disponíveis: 1)
Citações: Nenhuma citação encontrada
Índice h: Indice h não calculado  
Co-autores: Nenhum co-autor encontrado

Abstract

High Performance Concrete (BPC) with a blended cement has been found to be more beneficial in reducing corrosion of steel in reinforced concrete structures when compared with a plain opc mix. In this paper, results of a laboratory investigation carried out on HPC containing silica fume at replacement levels of 5-20% by weight of cement are reported. The concrete mixes investigated are designed for applications in a marine environment and had a 28 day compressive strength ranging from 50MPa to 10OMPa. The scope of this paper includes the long-term chloride ion penetration tests over a period of 1 year by immersion, accelerated chloride ion penetration tests at various voltage differences and actual rate of corrosion measurements carried out on reinforced concrete specimens in a cyclic, wetting and drying environment (24 hours salt water spraying and 24 hours drying at about 35ºC) using a half cell potential device. Chloride ion penetration depths with a 5% salt solution, as measured by silver nitrate, for mixes with silica fume were considerably smaller than those for corresponding mixes with only opc. The accelerated tests carried out for chloride ion penetration at different voltages gave a more in depth knowledge as to how chloride ions move through concrete capillary pores. The influence of total porosity, capillary pores and gel pores on chloride ion penetration and ion concentration at a given depth was quantified by measuring the porosity by two different methods. Although the pH of concrete containing silica fume was slightly lower than that of opc concrete, HPC containing silica fume was found to be very effective in reducing the rate of corrosion of steel reinforcement.
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