Carbonation of ternary cementitious concrete systems containing fly ash and silica fume

Peer review under responsibility of National Water Research Center.

Abstract

Carbonation is quite a complex physical negative effect phenomenon on concrete especially in the ones containing ternary blends of Portland Cement, fly ash, and silica fume. Nine selected concrete mixtures were prepared with various water to cementitious materials’ ratios and various cementitious contents. The concrete mixtures were adapted in such a way to have the same workability and air content. The fresh concrete properties were kept near identical in slump, air content, and unit weight. The variation was in the hardened concrete mechanical properties of compression and tension strength. The carbonation phenomenon was studied for these mixes showing at which mixes of ternary cementitious content heavy carbonation attacks maybe produced. The main components of such mixes that do affect the carbonation process with time were presented.

Keywords:

• Carbonation
• Concrete
• Ternary
• Portland cement
• Fly ash
• Silica fume

Acknowledgement

The authors are grateful to Prof. Koji Sakai and the facilities within the Department of Safety Systems Construction Engineering, Kagawa University, Japan, for his kind assistance and financial support to prepare this paper. The authors would like to acknowledge the corporation of the Civil & Architectural Engineering Department, Shikoku Research Institute, Shikoku electric Power Company, Japan.

Notes

Peer review under responsibility of National Water Research Center.