Aminobenzoate modified hydrotalcites as a novel smart additive of reinforced concrete for anticorrosion applications

Author(s): Z. Yang
Paper category: Conference
Book title: Concrete Repair, Rehabilitation and Retrofitting III (ICCRRR)
Editor(s): M.G. Alexander, H.-D. Beushausen, F. Dehn, P. Moyo
Print ISBN: 978-0-415-89952-9
Publisher: Taylor & Francis Group
Pages: 66 – 67
Total Pages: 2
Language: English

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-CO3 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 ion-exchange 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.

Online publication: 2014
Publication Type: abstract_only
Public price (Euros): 0.00