Effects of a Hybrid Superplasticizer on the Enhancement of Chloride Resistance in Offshore Concrete

Abstract:

The superplasticizer is very useful to reduce mixing water in fresh concrete, which results in the enhancement of watertightness and strength of hardened concrete. But it has a limit of not preventing steel bar embedded in concrete from corrosion under critical corrosive environments. Thus, this study aims at developing a nanohybrid agent chemically combining PCA admixture with anionic charge of clay. As results of concrete tests using general PCA superplasticizer and new one developed, it can be found that new plasticizer has higher performance in terms of time-dependent slump and air content loss, compressive strength, and anti-corrosion. It is expected for new superplasticizer, called the PCA-HT NHA, to be applicable to concrete under severe corrosive environments.

• Periodical: Applied Mechanics and Materials (Volumes 584-586)
• Pages: 1622-1625
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.584-586.1622
• Online since: July 2014
• Authors: Sang Chel Kim, Hyun Ho Lee
• Keywords: Anti-Corrosion Agent, Chloride Resistance, Compressive Strength, Embedded Bar, Offshore Concrete, Slump Loss, Superplasticizer

References

[1] J. T. Song et al., Jour. of Kor. Ceramic Soc., Vol. 41, KOREA (2004), pp.302-312.

[2] P. K. Mehta and Paulo J. M. Monteiro, Concrete, Prentice Hall, NJ (1993).

[3] V. H. Choy et al., Angew. Chem., Int. Ed., (2000), 39, 4042.

[4] V. Rivers, Layered Double Hydroxides: Present and Future, Nova Science Publisher Inc., NY (2001).

[5] J. H. Choy et al., Jour. of Kor. Ceramic Society, Vol. 22, No. 4, KOREA (1985), pp.107-114.

[6] D. O'Hare et al., Jour. of Mater. Chem., Vol. 12, (2002), pp.3191-3198.

[7] Y. S. Jeong, Design Methods and Policies for Chloride Resistance (in Korean), Jour. of Kor. Concrete Institute, Vol. 23, KOREA (2011), pp.56-63.