Experimental Carbonation Study for a Durability Assessment of Novel Cementitious Materials

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 dryi...

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Autores principales:	Lucija Hanžič, Sebastijan Robič, Alisa Machner, Marie Helene Bjørndal, Klaartje De Weerdt, Yushan Gu, Benoît Bary, Rosa Maria Lample Carreras, Aljoša Šajna
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	mortar absorption of water carbonation durability assessment model verification Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
Acceso en línea:	https://doaj.org/article/f8cb395f57054fce8285e665cab83280
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spelling	oai:doaj.org-article:f8cb395f57054fce8285e665cab832802021-11-11T17:50:23ZExperimental Carbonation Study for a Durability Assessment of Novel Cementitious Materials10.3390/ma142162531996-1944https://doaj.org/article/f8cb395f57054fce8285e665cab832802021-10-01T00:00:00Zhttps://www.mdpi.com/1996-1944/14/21/6253https://doaj.org/toc/1996-1944Durability 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<sup>−0.5</sup> 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.Lucija HanžičSebastijan RobičAlisa MachnerMarie Helene BjørndalKlaartje De WeerdtYushan GuBenoît BaryRosa Maria Lample CarrerasAljoša ŠajnaMDPI AGarticlemortarabsorption of watercarbonationdurability assessmentmodel verificationTechnologyTElectrical engineering. Electronics. Nuclear engineeringTK1-9971Engineering (General). Civil engineering (General)TA1-2040MicroscopyQH201-278.5Descriptive and experimental mechanicsQC120-168.85ENMaterials, Vol 14, Iss 6253, p 6253 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	mortar absorption of water carbonation durability assessment model verification Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
spellingShingle	mortar absorption of water carbonation durability assessment model verification Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85 Lucija Hanžič Sebastijan Robič Alisa Machner Marie Helene Bjørndal Klaartje De Weerdt Yushan Gu Benoît Bary Rosa Maria Lample Carreras Aljoša Šajna Experimental Carbonation Study for a Durability Assessment of Novel Cementitious Materials
description	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<sup>−0.5</sup> 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.
format	article
author	Lucija Hanžič Sebastijan Robič Alisa Machner Marie Helene Bjørndal Klaartje De Weerdt Yushan Gu Benoît Bary Rosa Maria Lample Carreras Aljoša Šajna
author_facet	Lucija Hanžič Sebastijan Robič Alisa Machner Marie Helene Bjørndal Klaartje De Weerdt Yushan Gu Benoît Bary Rosa Maria Lample Carreras Aljoša Šajna
author_sort	Lucija Hanžič
title	Experimental Carbonation Study for a Durability Assessment of Novel Cementitious Materials
title_short	Experimental Carbonation Study for a Durability Assessment of Novel Cementitious Materials
title_full	Experimental Carbonation Study for a Durability Assessment of Novel Cementitious Materials
title_fullStr	Experimental Carbonation Study for a Durability Assessment of Novel Cementitious Materials
title_full_unstemmed	Experimental Carbonation Study for a Durability Assessment of Novel Cementitious Materials
title_sort	experimental carbonation study for a durability assessment of novel cementitious materials
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/f8cb395f57054fce8285e665cab83280
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Experimental Carbonation Study for a Durability Assessment of Novel Cementitious Materials

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