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Article

Experimental Carbonation Study for a Durability Assessment of Novel Cementitious Materials

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Laboratorij za Beton, Zavod za Gradbeništvo, ZAG, Dimičeva Ulica 12, SI-1000 Ljubljana, Slovenia
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Centrum Baustoffe und Materialprüfung, Technische Universität München, TUM, Franz-Langinger-Str. 10, 81245 Munich, Germany
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Institutt for Konstruksjonsteknikk, Norges Teknisk-Naturvitenskaplige Universitet, NTNU, Richard Birkelandsvei 1A, 7491 Trondheim, Norway
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Service d’Étude du Comportement des Radionucléides, Université Paris-Saclay, CEA, 91191 Gif-sur-Yvette, France
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Acciona Construction, 28108 Alcobendas, Spain
*
Author to whom correspondence should be addressed.
Academic Editor: Gabriele Milani
Materials 2021, 14(21), 6253; https://doi.org/10.3390/ma14216253
Received: 1 September 2021 / Revised: 4 October 2021 / Accepted: 6 October 2021 / Published: 21 October 2021
Durability predictions of concrete structures are derived from experience-based requirements and descriptive exposure classes. To support durability predictions, a numerical model related to the carbonation resistance of concrete was developed. The model couples the rate of carbonation with the drying rate. This paper presents the accelerated carbonation and moisture transport experiments performed to calibrate and verify the numerical model. They were conducted on mortars with a water-cement ratio of either 0.6 or 0.5, incorporating either a novel cement CEM II/C (S-LL) (EnM group) or commercially available CEM II/A-S cement (RefM group). The carbonation rate was determined by visual assessment and thermogravimetric analysis (TGA). Moisture transport experiments, consisting of drying and resaturation, utilized the gravimetric method. Higher carbonation rates expressed in mm/day−0.5 were found in the EnM group than in the RefM group. However, the TGA showed that the initial portlandite (CH) content was lower in the EnM than in the RefM, which could explain the difference in carbonation rates. The resaturation experiments indicate an increase in the suction porosity in the carbonated specimens compared to the non-carbonated specimens. The study concludes that low clinker content causes lower resistance to carbonation, since less CH is available in the surface layers; thus, the carbonation front progresses more rapidly towards the core. View Full-Text
Keywords: mortar; absorption of water; carbonation; durability assessment; model verification mortar; absorption of water; carbonation; durability assessment; model verification
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MDPI and ACS Style

Hanžič, L.; Robič, S.; Machner, A.; Bjørndal, M.H.; De Weerdt, K.; Gu, Y.; Bary, B.; Lample Carreras, R.M.; Šajna, A. Experimental Carbonation Study for a Durability Assessment of Novel Cementitious Materials. Materials 2021, 14, 6253. https://doi.org/10.3390/ma14216253

AMA Style

Hanžič L, Robič S, Machner A, Bjørndal MH, De Weerdt K, Gu Y, Bary B, Lample Carreras RM, Šajna A. Experimental Carbonation Study for a Durability Assessment of Novel Cementitious Materials. Materials. 2021; 14(21):6253. https://doi.org/10.3390/ma14216253

Chicago/Turabian Style

Hanžič, Lucija, Sebastijan Robič, Alisa Machner, Marie Helene Bjørndal, Klaartje De Weerdt, Yushan Gu, Benoît Bary, Rosa Maria Lample Carreras, and Aljoša Šajna. 2021. "Experimental Carbonation Study for a Durability Assessment of Novel Cementitious Materials" Materials 14, no. 21: 6253. https://doi.org/10.3390/ma14216253

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