Dependency of C–S–H carbonation rate on CO2 pressure to explain transition from accelerated tests to natural carbonation

Hyvert, Nicolas; Sellier, Alain; Duprat, Frédéric; Rougeau, Patrick; Francisco, Philippe

doi:10.1016/j.cemconres.2010.06.010

Cited by 172 publications

(84 citation statements)

References 8 publications

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“…The carbonation of Ca(OH) 2 is followed by an increase in the volume of solids [46]; Silva et al [47] show the reduction of 15 % in porosity and approximately 6.5 % increase in the bulk density of the composites submitted to accelerated carbonation for 14 days. CaCO 3 is precipitated in the pore structure of the composite matrix, also acting as a binder, filling the voids, and thereby reducing the free intake of water due to the decrease of pore size [48]. Then, these pores become almost closed instead of the initially predominant capillary pores, and less permeable to silicates, so decreasing diffusion of Si and S ions during curing and secondary hydration.…”

Section: Changes In the Hydration Products Due To Early Carbonationmentioning

confidence: 99%

Rationalizing the impact of aging on fiber–matrix interface and stability of cement-based composites submitted to carbonation at early ages

et al. 2016

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The objective of this work is to show the effect of carbonation at early stages on fiber-cement composites and impact on hydration, chemical and dimension stability. Carbonation increased the content of CaCO 3 polymorphs and consumed Ca(OH) 2 and other hydrated calcium phases. Micrographs and energydispersive spectrometry showed the CaCO 3 formed is precipitated in the pore structure of the matrix, decreasing diffusion of Si, S, and Al during hydration. Therefore, a refining process of pore sizes is produced, and fiber-matrix interface in carbonated composites was improved, leading to volume stabilization of the composite, as indicated by lower drying shrinkage and lower porosity.

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Section: Changes In the Hydration Products Due To Early Carbonationmentioning

confidence: 99%

Rationalizing the impact of aging on fiber–matrix interface and stability of cement-based composites submitted to carbonation at early ages

et al. 2016

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“…1) was used [9]. This model allowed us to calculate the carbonation depth as a function of time (a given time corresponding to the service life of a structure), and thus to compare the carbonation state of the different cements (blended or not) studied in the precedent section.…”

Section: Lifetime Span Regarding Carbonationmentioning

confidence: 99%

Carbonation of Blended Binders Containing Metakaolin

2015

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The pozzolanic materials are often recommended for their very good durability in aggressive environment. Unfortunately, this is not always true and particularly in the case of carbonation by the atmospheric CO 2 . Although cement replacement by pozzolanic materials causes a decrease in pore size, the pozzolanic reaction consumes portlandite and decreases the protection potential against CO 2 ingress. This is the case for most pozzolanic materials, including metakaolin. The aim of this study is first to confirm the literature results of carbonation by using flash metakaolin in partial replacement of cements (CEM I, CEM II A-LL and CEM II A-V). Then the concretes with a metakaolin are compared with concretes based on standardized cement in order to assess the carbonation depth of metakaolinbased concretes and concretes used today in the building construction. Even though the cement replacement of CEM I and CEM II A-V by metakaolin increases the carbonation depth, results are not the same with the CEM II A-LL cement. The interaction of metakaolin with the cement limestone filler can explain this better performance, certainly because the hemicarboaluminate allows slowing down the CO 2 propagation through the matrix.

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“…However, a wide range of CO 2 concentrations, different relative humidity conditions and temperatures are used in such accelerated tests [8,10,[12][13][14]. Therefore it is not clear, whether the results obtained with one specific accelerated test are transferable to another one and, even more important, to natural carbonation [15][16][17][18][19][20]. Another important point is the curing of the samples before they are exposed to carbonation.…”

Section: Introductionmentioning

confidence: 96%

Relation between carbonation resistance, mix design and exposure of mortar and concrete

Leemann

Nygaard

Kaufmann

et al. 2015

Cement and Concrete Composites

163

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Dependency of C–S–H carbonation rate on CO2 pressure to explain transition from accelerated tests to natural carbonation

Cited by 172 publications

References 8 publications

Rationalizing the impact of aging on fiber–matrix interface and stability of cement-based composites submitted to carbonation at early ages

Rationalizing the impact of aging on fiber–matrix interface and stability of cement-based composites submitted to carbonation at early ages

Carbonation of Blended Binders Containing Metakaolin

Relation between carbonation resistance, mix design and exposure of mortar and concrete

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