Title:
Corrosion of Steel in Concrete Made With Slag Cement
Author(s):
Brian B. Hope and Alan C. Ip
Publication:
Materials Journal
Volume:
84
Issue:
6
Appears on pages(s):
525-531
Keywords:
blast furnace slag; chlorides; corrosion; electrical resistance; portland slag cements; reinforced concrete; reinforcing steels; Materials Research
DOI:
10.14359/2470
Date:
11/1/1987
Abstract:
The effect of slag cement on corrosion of steel in concrete was investigated. Reinforced concrete slabs containing different proportions of slag and portland cement were subjected to various cycles of wetting and drying by soaking in an air-saturated 3.5 percent sodium chloride solution and drying in laboratory air. Corrosion of steel was examined electrochemically and visually. Concrete electrical resistivity and chloride measurements were conducted. Corrosion of the steel rods in the concretes decreased with increase in slag content except during the first seven days after casting. This was accompanied by a corresponding higher concrete electrical resistivity and lower chloride diffusion rate. The electrical resistivities of concretes made with slag cement appeared to be more sensitive to a change in storage condition than that of portland cement concretes.