Title: Corrosion Influence on Bond between Steel and Concrete

Author(s): Lamya Amleh and Saeed Mirza

Publication: Structural Journal

Volume: 96

Issue: 3

Appears on pages(s): 415-423

Keywords: bars; corrosion; crack width and spacing; reinforcing steels

DOI: 10.14359/676

Date: 5/1/1999

Abstract:
The influence of corrosion on bond between the reinforcing steel and concrete was studied using a preliminary series of tests on 14 tension specimens, each 100 mm in diameter and 1-m long, and reinforced with one No. 20 bar. The specimens were subjected to accelerated corrosion by immersion in a 5 percent NaCl solution and subjected to a voltage of 5 v. The relative bond effectiveness of the embedded bars at different stages of corrosion was determined based on the details of the transverse and longitudinal splitting cracks. The bond strength was observed to decrease rapidly with an increase in the corrosion level, dropping from a 9 percent decrease in the average bond stress for a steel weight loss of 4 percent, to a bond stress decrease of 92 percent for a weight loss of 17.5 percent. The latter represented a case of severe corrosion, involving deterioration of the bar ribs.