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Chloride Adsorption by Calcined Layered Double Hydroxides in Hardened Portland Cement Paste

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dc.contributor.authorYoon, Seyoon
dc.contributor.authorMoon, Juhyuk
dc.contributor.authorBae, Sungchul
dc.contributor.authorDuan, Xiaonan
dc.contributor.authorGiannelis, Emmanuel
dc.contributor.authorMonteiro, Paulo
dc.date.accessioned2015-03-26T18:21:01Z
dc.date.available2015-03-26T18:21:01Z
dc.date.issued2014-02-13
dc.description.abstractThis study investigated the feasibility of using calcined layered double hydroxides (CLDHs) to prevent chloride-induced deterioration in reinforced concrete. CLDHs not only adsorbed chloride ions in aqueous solution with a memory effect but also had a much higher binding capacity than the original layered double hydroxides (LDHs) in the cement matrix. We investigated this adsorption in hardened cement paste in batch cultures to determine adsorption isotherms. The measured and theoretical binding capacities (153 mg g−1 and 257 mg g−1, respectively) of the CLDHs were comparable to the theoretical capacity of Friedel's salt (2 mol mol−1 or 121 mg g−1), which belongs to the LDH family among cementitious phases. We simulated chloride adsorption by CLDHs through the cement matrix using the Fickian model and compared the simulation result to the X-ray fluorescence (XRF) chlorine map. Based on our results, it is proposed that the adsorption process is governed by the chloride transport through the cement matrix; this process differs from that in an aqueous solution. X-ray diffraction (XRD) analysis showed that the CLDH rebuilds the layered structure in a cementitious environment, thereby demonstrating the feasibility of applying CLDHs to the cement and concrete industries.en_US
dc.description.sponsorshipThis publication was based on work supported in part by Award No. KUS-l1-004021 and No. KUS-C1-018-02, made by King Abdullah University of Science and Technology (KAUST). We acknowledge Sasol Company for a sample of Pural MG 63 HT.en_US
dc.identifier.citationClancy, Paulette. "Chemical Engineering in the Electronics Industry: Progress towards the Rational Design of Organic Semiconductor Heterojunctions." Current Opinion in Chemical Engineering: 117-22. Print.en_US
dc.identifier.urihttps://hdl.handle.net/1813/39281
dc.language.isoen_USen_US
dc.publisherMaterials Chemistry and PHysicsen_US
dc.subjectComposite materialen_US
dc.subjectDiffusionen_US
dc.subjectCorrosionen_US
dc.subjectAdsorptionen_US
dc.titleChloride Adsorption by Calcined Layered Double Hydroxides in Hardened Portland Cement Pasteen_US
dc.typearticleen_US

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