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      Chloride Resistance of Portland Cement-Based Mortar Incorporating High Aluminate Cement and Calcium Carbonate

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          Abstract

          Whether chloride resistance is highly influenced by chloride binding capacity remains unknown. In this study, the chloride resistance of Portland cement-based mortar incorporating aluminate cement and calcium carbonate was investigated considering the chloride binding capacity, pore structures and chloride diffusion coefficient from non-steady state chloride migration and natural chloride diffusion. The cement hydrates were investigated using X-ray diffraction and thermogravimetric analysis. The chloride binding capacity was evaluated based on the chloride adsorption from the solutions using the adsorption isotherm. The aluminate cement, as an available alumina source, can stimulate the formulation of layered double hydroxides, which in turn can increase the chloride binding capacity. The results of mercury intrusion porosimetry show that non-substituted (control) and substituted (only aluminate cement) specimens have capillary pore volume 8.9 vol % and 8.2 vol %, respectively. However, the specimen substituted with aluminate cement and calcium carbonate shows a higher capillary volume (12.9 vol %), which correlates with the chloride diffusion coefficient. Although the specimen substituted with calcium carbonate has a higher chloride binding capacity than the control, it does not necessarily affect the decrease in the chloride diffusion coefficient. The capillary pore volume can affect not only the chloride diffusion but also the chloride adsorption.

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          Supplementary cementitious materials

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            Influence of limestone on the hydration of Portland cements

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              Critical chloride content in reinforced concrete — A review

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                Author and article information

                Journal
                Materials (Basel)
                Materials (Basel)
                materials
                Materials
                MDPI
                1996-1944
                12 January 2020
                January 2020
                : 13
                : 2
                : 359
                Affiliations
                [1 ]Department of Architectural Engineering, Hanyang University, Ansan 15588, Korea; yslee23@ 123456hanyang.ac.kr
                [2 ]Department of Architecture, Kangwon National University, Chuncheon 24341, Korea; smlim09@ 123456gmail.com
                Author notes
                [* ]Correspondence: ercleehs@ 123456hanyang.ac.kr ; Tel.: +82-31-400-5181
                Author information
                https://orcid.org/0000-0002-7360-6439
                https://orcid.org/0000-0002-8425-7043
                Article
                materials-13-00359
                10.3390/ma13020359
                7013501
                31940945
                052af44b-fc48-49cf-abcf-acb8bd6bef12
                © 2020 by the authors.

                Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license ( http://creativecommons.org/licenses/by/4.0/).

                History
                : 25 November 2019
                : 10 January 2020
                Categories
                Article

                chloride diffusion,chloride binding capacity,capillary pore volume,portland cement,aluminate cement,calcium carbonate

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