ABSTRACT
ABSTRACT: The purpose of the study is to know whether the permeability of concrete bridge decks will be reduced by adding mineral admixtures. Three bridge decks were monitored, one bridge was constructed with conventional Portland cement concrete, the second bridge was constructed with a concrete containing 38% replacement of Portland cement by fly ash , and the third bridge contained 35% Ground Granulated Blast Furnace Slag (GGBFS) as a partial replacement of Portland cement in its concrete. Corrosion of reinforcement and the concrete resistivity were monitored at the three bridges between 2002 and 2008 by using the Gecor 6 instrument. It is seen that the corrosion rate is the highest in the bridge containing no mineral admixture, the next high values are in the bridge containing GGBFS and the least corrosion rate existed in the bridge whose concrete contained fly ash.
