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A New Smart Additive of Reinforced Concrete Based on Modified Hydrotalcites: Preparation, Characterization and Anticorrosion Applications

Published online by Cambridge University Press:  22 November 2012

Zhengxian Yang ,
Hartmut Fischer  and
Rob Polder
Zhengxian Yang
Affiliation:
Materials innovation institute (M2i), 2600GA Delft, The Netherlands Section of Materials and Environment, Faculty of Civil Engineering and Geosciences, Delft University of Technology, 2628CN Delft, The Netherlands
Hartmut Fischer
Affiliation:
TNO Materials Performance, 5612AP Eindhoven, The Netherlands
Rob Polder
Affiliation:
Section of Materials and Environment, Faculty of Civil Engineering and Geosciences, Delft University of Technology, 2628CN Delft, The Netherlands TNO Building Materials, 2600AA Delft, The Netherlands
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Abstract

A carbonate form of Mg-Al-hydrotalcite and its p-aminobenzoate (pAB) modified derivative (i.e.,Mg(2)Al-pAB) were synthesized and characterized by means of XRD and FT-IR. The anticorrosion behavior was evaluated based on open circuit potential (OCP) of carbon steel in simulated concrete pore solution and chloride-exchange experiments. The preliminary results shown in this study demonstrated that ion-exchange indeed occurred between chlorides and the intercalated pAB anions in Mg(2)Al-pAB structure, thereby reducing the free chloride concentration in simulated concrete pore solution. The simultaneously released inhibitive pAB anions were found to exhibit the envisaged inhibiting effect and caused corrosion initiation of the steel shifting to a higher chloride concentration than without the modified hydrotalcites.

Keywords

compositechemical compositioncorrosion
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1488: Symposium 7B – Concrete with Smart Additives and Supplementary Cementitious Materials , 2012 , imrc12-1488-7b-027
Copyright
Copyright © Materials Research Society 2012 

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