A new smart additive of reinforced concrete based on modified hydrotalcites: Preparation, characterization and anticorrosion applications
conference paper
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. © 2012 Materials Research Society.
Topics
Carbon steelChlorine compoundsConcrete additivesConcretesCorrosion protectionCorrosion resistanceIon exchangeIonsReinforced concreteAnti-corrosionChloride concentrationsCorrosion initiationFree chloridesInhibiting effectMg-Al hydrotalciteOpen circuit potentialSimulated concrete pore solutionAluminum
TNO Identifier
503166
ISSN
02729172
ISBN
9781632660862
Publisher
Materials Research Society
Source title
21st International Materials Research Congress, IMRC 2012, 12 August 2012 through 17 August 2012, Cancun
Pages
56-61
Files
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