Chloride binding in concrete containing PFA, gbs or silica fume under sea water exposure

摘要: The paper reports an experimental investigation on different mix proportions of normal concrete and concretes incorporating various fractions cement replacement by pulverized fly ash (PFA), ground blastfurnace slag (gbs) or silica fume. chloride binding capacity each matrix was determined after immersion in sea water for up to 270 days, exposure laboratory marine cycles (up 520 cycles) tidal the North Sea 7.5 years). Extensive data acid-soluble concentration (total chloride), free pore fluid evaporable content hardened were obtained order determine chloride-binding matrices. Corrosion rebar electrodes embedded these matrices also monitored. results show that bound decrease with increasing depth into concrete. Higher water-cement ratios contents result increased chloride. near surface is not significantly affected incorporation PFA gbs. At greater depths, use gbs a reduction Cl- cementitious binder. Replacement fume greatly reduced Accelerated penetration lower than under natural conditions. It shown correlates corrosion rates reinforcement made binders, while Cl--OH- ratio has no correlation.