Title
Aminobenzoate modified hydrotalcites as a novel smart additive of reinforced concrete for anticorrosion applications
Author
Yang, Z.
Fischer, H.R.
Polder, R.B.
Publication year
2012
Abstract
A carbonate form of Mg-Al-hydrotalcite with Mg/Al = 2 and its p-aminobenzoate (pAB) modified derivative have been synthesized and characterized by means of XRD, IR and TG/DSC. Mg(2) Al-CO 3 was prepared by a coprecipitation method and was subsequently modified by pAB through the calcination-rehydration technique. The results from the relevant characterizations combined with Total Carbon Content (TOC) analysis further confirmed that pAB anions were successfully intercalated into the interlayer space of the hydrotalcite. The anticorrosion behavior of Mg(2)Al-pAB was evaluated on the basis of open circuit potential (OCP) monitoring of carbon steel in simulated concrete pore solution at pH 13 contaminated with chloride. The preliminary results from this study demonstrated that ionexchange indeed occurred between free chloride ions in simulated pore solution and the intercalated pAB anions in Mg(2)Al-pAB structure, thereby reducing the free chloride concentration. The simultaneously released inhibitive p-aminobenzoate anions were found to exhibit the envisaged inhibiting effect and cause a shift of corrosion initiation of the steel to higher chloride concentrations than without the modified hydrotalcite. © 2012 Taylor & Francis Group.
Subject
Mechatronics, Mechanics & Materials Building Engineering & Civil Engineering
MPC - Materials Performance Centre BM - Building Materials
TS - Technical Sciences
High Tech Systems & Materials Buildings and Infrastructure
Materials
Industrial Innovation Built Environment
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TNO identifier
465228
ISBN
9780415899529
Source
3rd International Conference on Concrete Repair, Rehabilitation and Retrofitting, ICCRRR 2012, 3-5 September 2012, Cape Town, South-Africa, 175-180
Document type
conference paper