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Local study of the corrosion kinetics of hardened Portland cement under acid attack

Abstract : Whereas the chemical reactions occurring during the acid corrosion of cementitious materials are now well known, their reaction rate have still not been measured. We propose here a methodology using digital holographic interferometry to access to the pure surface reaction rate. This method makes possible the dfferentiation between the dissolution and precipitation steps. We use it to measure the reaction rate constant of the dissolution of hardened Portland cement in aqueous solutions of nitric, sulfuric and hydrochloric acid at pH 2. This quantity is seen to be unexpectedly similar for the three acids, with a value of the order of 1 mg/m2/s. We have measured the evolution of this reaction rate constant with the pH in nitric acid. We have also measured the real pH of the solution at the material surface, which is always alkaline (pH>11), even for attacks by solution with pH as low as 1.
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Submitted on : Friday, May 21, 2021 - 5:42:54 PM
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Heloise Gay, Thomas Meynet, Jean Colombani. Local study of the corrosion kinetics of hardened Portland cement under acid attack. Cement and Concrete Research, 2016, 90, pp.36-42. ⟨10.1016/j.cemconres.2016.09.007⟩. ⟨hal-02303925⟩



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