Sodium silicate solution (or water glass, WG) activated slag is one of the potential alternatives to 100% replace PC. WG activated slag concrete has different pore solution composition from that of PC. This could result in different chloride transport and corrosion of embedded steel for such concretes. In this research, chloride transport and resulting corrosion of steel in 12 WG activated slag concretes with Na20% of 4, 6 and 8 and Ms of 0.75, 1.00, 1.50 and 2.00 were investigated. PC concrete with the same binder content of 400kg/m3 was studied as a reference. The results showed that the corrosion rate of the steel in the WG activated slag concretes was comparable or even higher than that of the PC concrete irrespective of the lower chloride diffusivity of the former. The WG activated slag concrete with the combination ofNa20% of 6% and Ms of 1.50 gave the lowest chloride diffusivity and corrosion rate. Chloride migration coefficient, ASTM C 1202 charge passed and bulk electrical resistivity had a poor correlation with non-steady state chloride diffusion coefficient for WG activated slag concretes. The criteria of macro cell corrosion current and half-cell potential developed in PC may be not suitable for quantifying and qualifying corrosion activity of the steel in such concretes. The WG activated slag concretes were identified to be not suitable in chloride exposures XS3 and XD3 by considering workability, compressive strength, pore solution composition and corrosion rate.
| Identifer | oai:union.ndltd.org:bl.uk/oai:ethos.bl.uk:602593 |
| Date | January 2013 |
| Creators | Ma, Qianmin |
| Publisher | Queen's University Belfast |
| Source Sets | Ethos UK |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
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