Reinforcing steel corrosion in high-volume fly ash concrete

In this paper, experimental investigations on the corrosion of reinforcing steel bars embedded in slabs containing high volume fly ash (HVFA) concrete were undertaken. The corrosion resistance of the rebars in slabs was then compared to a control mix of conventional Portland concrete (PC) having the same w/ em ratio. Reinforcing steel bars were embedded in these slabs with different depths of concrete cover in order to investigate steel corrosion induced by chlorides. The chloride profile was assessed using acid soluble chloride analysis technique to examine the effect of HVFA in reducing the ingress of chlorides into concrete. Tests of reinforcing steel bars embedded in PC with higher water/ cement ratios (w/ c :::: 0.43 and 0.55) were also included for comparison purpose.Dans ce document, l?on fait \ue9tat d?investigations exp\ue9rimentales qui ont port\ue9 sur la corrosion des barres d?armature en acier noy\ue9es dans des dalles contenant du b\ue9ton de cendres volantes \ue0 volume \ue9lev\ue9. La r\ue9sistance \ue0 la corrosion des barres d?armature dans les dalles a \ue9t\ue9 ensuite compar\ue9e \ue0 celle d?un m\ue9lange t\ue9moin de b\ue9ton \ue0 ciment Portland classique, ayant le m\ueame dosage d?eau/mat\ue9riau cimentaire. On a noy\ue9 les barres d?armature dans ces dalles, dans des \ue9paisseurs de chape vari\ue9es, afin d?\ue9tudier la corrosion de l?acier induites par les chlorures. Le profil des chlorures a \ue9t\ue9 \ue9valu\ue9 au moyen d?une techniques d?analyse des chlorures solubles afin d?examiner l?incidence des cendres volantes \ue0 volume \ue9lev\ue9 sur la r\ue9duction de la p\ue9n\ue9tration des chlorures dans le b\ue9ton. Des essais des barres d?armature noy\ue9es dans le b\ue9ton \ue0 ciment Portland comportant des dosages eau/mat\ue9riaux cimentaires plus \ue9lev\ue9s (0:43 et 0:55) ont \ue9galement \ue9t\ue9 inclus aux fins de la comparaison.Peer reviewed: YesNRC publication: Ye