Corrosion of Reinforced Concrete

Title :
Flexural behavior of concrete slabs with corroded bars

Authors :
Lou Chunga, Husam Najmb, Perumalsamy Balagurub

Abstract :

Experimental and analytical evaluations of concrete slabs reinforced with corroded and uncorroded bars are presented. Seventy simply supported slabs reinforced with 10 mm diameter bars were tested in bending using a four-point load setup. The primary variables were the bond length and the corrosion level. The bond lengths varied from 10 to 440 mm and corrosion levels ranged from 0% to 4.6% diameter loss. The moment capacity of the slabs was also predicted using results from pull-out tests conducted on corroded bars in a separate study. The results indicate that the behavior of the slabs with corroded reinforcement can be predicted with good accuracy. As in the case of pull-out tests, a small amount of corrosion increases the flexural capacity of the slab. But the capacity reduces considerably when the loss in bar diameter exceeds 2%. The results confirm the hypothesis that bond deterioration is the major contributor to the reduction of moment capacity.

Keywords :
Bending strength, Bond strength, Corrosion, Diameter loss, Moment capacity

Source :
http://www.sciencedirect.com/science/article/pii/S0958946507001345