Improvement of Resistance of Concrete Against Chloride Ingression Using a New Admixture

Wei Zhang; Xiao Yao; Ru Mu

doi:10.4028/www.scientific.net/AMR.415-417.1496

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The Use of Residual Rice Husk Ash from Thermal Power Plant as Cement Replacement Material in Producing Self-Compacting Concrete
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Improvement of Resistance of Concrete Against Chloride Ingression Using a New Admixture
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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 415-417Improvement of Resistance of Concrete Against...

Improvement of Resistance of Concrete Against Chloride Ingression Using a New Admixture

Abstract:

This paper studies a new admixture used to improve the resistance of concrete against the chloride penetration. The minerals blends, e.g., fly ash and GGBFS, can significantly improve the resistance of concrete against chloride penetration, which is one of the main reasons causing the corrosion of rebar in concrete. Another measure used to recover the resistance of rebar against corrosion is corrosion inhibitor. The new admixture investigated herein is fabricated by combination of corrosion inhibitor and mineral additive to form a new admixture. One of the typical composition of the new admixture is (in mass percentages) with calcium nitrite 20%~30%, calcined gypsum 15%~20%, instant layered sodium metasilicate 5%~10%, hexamethylene tetramine 3%~5%, sodium tripolyphosphate 1%~3%, water reducer 0% ~20%, AEA 0% ~ 0.4% (optional) and fly ash. Series of tests have been carried out to verify the performance of the new admixture. The results showed that by adding the new admixture with mass dosage of 3~5% of the cementitious materials into concrete, the penetration of chloride of chloride into concrete is significantly slowed down. Also, the new admixture is compared with conventional products experimentally and it is proved that the new admixture does have advantage in the resistance against corrosion of steel bars in concrete.

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Periodical:

Advanced Materials Research (Volumes 415-417)

Pages:

1496-1502

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.415-417.1496

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Online since:

December 2011

Authors:

Wei Zhang, Xiao Yao, Ru Mu

Keywords:

Anti-Corrosion Admixture, Concrete, Durability, Inhibitor

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