Curing chloride-induced corrosion

Table 12.5 Initiation time for chloride-induced corrosion estimated for different concrete cover thicknesses, utilising apparent diffusion coefficients of chlorides (D,pp) evaluated on specimens submerged in the North Sea for 16 y (concrete of 420 kg/m of Portland cement, OPC, or blast furnace slag cement with 70% GGBS and identical curing procedures) [18]...

Concretes prepared with blast furnace slag cement and pozzolanic cement have lower Ca(OH)2 content and pH of the pore solution, thus in principle providing less protection against carbonation or chloride induced corrosion with time. However, the pozzolanic reaction leads to a filling and refining of the pore system and thus to a less or much less permeable concrete. Due to the slow hydration reaction curing (keeping wet the concrete in its early age) is much more important to achieve low porosity. 

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