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Influence of curing on chloride ions penetration in concretes
Chloride ions penetration can be an important cause of concrete reinforcement depassivation and corrosion, especially in marine environment structures. The influence of ground granulated blast funace slag replacement in portland cements on chloride ions penetration in cover concrete was investigated. Concretes with W/C of 0.42 and three different portland cements, containing 0 %, 27 % and 53 % of blast furnace slag replacement by mass, were manufactured. The influence of two curing conditions on chloride ions absorption was also investigated: immersion in water (25 deg C) for 7 days and steam curing (60 deg C) for 2 hours. Concrete samples were submitted to 8 wetting-drying cycles in 5 % NaCl solution. Water-soluble chloride ions concentration was monitored in all the 8 cycles, in the cover depth from 0 to 40 mm. Concretes produced with slag cements have shown the lowest chloride ions content in both curing methods investigated. Considering 0.4 % by cement mass as a maximum value of chloride ion content to prevent reinforcement depassivation, it was observed that blast furnace slag cement concretes have shown results under this limit from the depth of 0 mm when wet-cured and from the depth of 20 mm when steam cured.
Influence of curing on chloride ions penetration in concretes
Chloride ions penetration can be an important cause of concrete reinforcement depassivation and corrosion, especially in marine environment structures. The influence of ground granulated blast funace slag replacement in portland cements on chloride ions penetration in cover concrete was investigated. Concretes with W/C of 0.42 and three different portland cements, containing 0 %, 27 % and 53 % of blast furnace slag replacement by mass, were manufactured. The influence of two curing conditions on chloride ions absorption was also investigated: immersion in water (25 deg C) for 7 days and steam curing (60 deg C) for 2 hours. Concrete samples were submitted to 8 wetting-drying cycles in 5 % NaCl solution. Water-soluble chloride ions concentration was monitored in all the 8 cycles, in the cover depth from 0 to 40 mm. Concretes produced with slag cements have shown the lowest chloride ions content in both curing methods investigated. Considering 0.4 % by cement mass as a maximum value of chloride ion content to prevent reinforcement depassivation, it was observed that blast furnace slag cement concretes have shown results under this limit from the depth of 0 mm when wet-cured and from the depth of 20 mm when steam cured.
Influence of curing on chloride ions penetration in concretes
Einfluss der Härtens auf das Eindringen von Chlorid in Beton
Martins, A.R. (author) / Camarini, G. (author)
2002
18 Seiten, 10 Bilder, 9 Tabellen, 11 Quellen
Conference paper
English
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