Corrosion of Reinforcing Steel in Strain Hardening Fiber Reinforced Cementitious Composites
Corrosion of reinforcing steel is one of main deterioration mechanism in reinforced concrete structures. In this paper experimental results on the corrosion durability of cracked and uncracked reinforced concrete (RC) beams made with plain mortar and strain hardening fiber reinforced cementitious composites (SHFRCC) are presented. Three series of beams are considered. The first series is RC beams. While the second and third series consisted of SHFRCC beams containing polyethylene and hybrid steel-polyethylene fibers, respectively. In each series four beams (two for uncracked and the rest for cracked) measuring 100 X 100 X 400 mm in dimension were cast. All beams are subjected to cyclic wetting and drying using water containing 3% NaCl for more than three months. In addition, an external potential is also applied across the anode and the cathode to accelerate the corrosion. Corrosion of steel bar is monitored through a pair of mini sensors attached to the reinforcing bar in each beam. The sensor used in this study was only 13 mm in diameter and 10 mm in height and are concrete embeddable. Test results show that both cracked and uncracked beams containing SHFRCC material exhibited better corrosion protection than that of plain mortar beams. Among all specimens the beam containing hybrid steel-polyethylene fiber SHFRCC exhibited the best corrosion protection.