Title:
Influence of Cement Composition on the Corrosion of Reinforcement and Sulfate Resistance of Concrete
Author(s):
Rasheeduzzafar, Fahd H. Dakhil, A. Saad Al-Gahrani, S. S. Al-Saadoun, and Maher A. Bader
Publication:
Materials Journal
Volume:
87
Issue:
2
Appears on pages(s):
114-122
Keywords:
blended cements; cement compound composition; cements; cement types; concretes; corrosion; deterioration; gypsum; marine atmospheres; reinforcing steels; silica fume; sulfate resistance; Materials Research
DOI:
10.14359/1908
Date:
3/1/1990
Abstract:
Performance data based on accelerated corrosion-monitoring and exposure site tests indicate that cement type, particularly 3A content, significantly affected concrete durability with respect to corrosion of reinforcing steel. On average, Type I cement (C3A = 9.5 percent) performed 1.7 times better than Type V cement (C3A = 2.8 percent) in terms of time to initiation of corrosion. Accelerated sulfate resistance tests show that a 20 percent microsilica blended with a Type I 14 percent C3A cement performed 1.4 times better against sulfate attack than did a Type V portland cement with 1.88 percent C3A. Sulfate deterioration data also indicate that in addition to the C3A content, the C3A / C2S ratio of the cement has a significant effect on the sulfate resistance of the cement. The sulfate deterioration for a Type I portland cement (C3A = 11.9 percent) with a C3A / 2S ratio of 7.88 was found to be 2.5 times the deterioration for another Type I portland cement (C3A = 9.3 percent) with a C3S / C2S ratio of 2.57 after 150 days of exposure to an accelerated sulfate test. Significant retrogression of strength was observed on immersion in sulfate solution even for a Type V (C3A = 1.88 percent) sulfate-resistant cement which had a high C3S / C2S ratio of 5.28.