Naslov
Effects of chromium (VI) reducing agent in cement on corrosion of reinforcing steel

Autori
Rosković, Ružica ; Stipanović Oslaković, Irina ; Radić, Jure ; Serdar, Marijana

Izvornik
Cement & concrete composites (0958-9465) 33 (2011); 1020-1025

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
cement; Cr(VI); reducing agent; corrosion; steel

Sažetak
Directive 2003/53/EC, relating to restrictions on marketing and use of certain dangerous substances and preparations, limits use and distribution of cement containing more than 2 ppm of chromium (VI), except in terms of use of cement in totally automated work processes whereby skin contact may be excluded. In course of production of cement it is necessary to add a reducing agent that converts soluble hexavalent chromium into trivalent chromium. This paper explores effects of iron (II) sulphate reducing agents, namely monosulphate and heptahydrate, as cement admixtures, on corrosion of concrete reinforcement. Accelerated corrosion tests of reinforcing steel have been performed in pore solutions simulating concrete prepared using either CEM I or CEM II type cement, with addition of various concentrations of iron (II) sulphate reducing agent. Results of all performed tests indicate corresponding tendencies and point towards possible effects of iron (II) sulphate on reinforcement in terms of accelerating corrosion of the reinforcement. This study directs towards immediate need for a more detailed research, especially in concrete as more realistic corrosion environment, of application of iron (II) sulphate as a reducing agent in cement.

Izvorni jezik
Engleski

Znanstvena područja
Građevinarstvo, Temeljne tehničke znanosti

POVEZANOST RADA