Influence of Cyclic Humidity on Carbonation of Concrete

Chen, Chun-Tao; Ho, Chia-Wei

doi:10.1061/(asce)mt.1943-5533.0000750

Cited by 37 publications

(7 citation statements)

References 13 publications

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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].…”

Section: Introductionmentioning

confidence: 94%

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

Leemann

Nygaard

Kaufmann

et al. 2015

Cement and Concrete Composites

172

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Section: Introductionmentioning

confidence: 94%

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

Leemann

Nygaard

Kaufmann

et al. 2015

Cement and Concrete Composites

172

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“…Usually, accelerated tests are used to assess the carbonation resistance of concrete. The CO 2 concentrations used in such tests can vary widely from 0.03 to 100 % and the relative humidity (RH) generally ranges from 50 to 65 % [1][2][3][4][5][6][7][8]. The relatively narrow range of RH is due to the fact that the progress of carbonation reaches a maximum at a RH of about 60 % [e.g.…”

Section: Introductionmentioning

confidence: 99%

Carbonation of concrete: the role of CO2 concentration, relative humidity and CO2 buffer capacity

Leemann

Moro²

2016

Mater Struct

166

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In this study, the effect of CO 2 concentration and ambient relative humidity (RH) on accelerated and natural carbonation of 18 concrete mixtures produced with nine different cement types is investigated. Increasing the CO 2 concentration from 0.045 to 1 and 4 % at 57 % RH does not alter the relative carbonation resistance between the concrete mixtures. The increase of RH from 57 to 70 and 80 % RH at 4 % CO 2 shows a water-to-cement ratio and cementspecific effect that affects the relative carbonation resistance between the concrete mixtures. The carbonation resistance at 4 % CO 2 and 57 % RH allows assessing the carbonation resistance of concrete in sheltered and with restrictions in unsheltered outdoor exposure. The carbonation resistance below 70 % RH is mainly governed by the CO 2 buffer capacity. However, in the accelerated tests at 80 % RH and in the unsheltered outdoor exposure capillary condensation is of increased importance.

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“…However, as concrete produced with blended cements usually displays a reduced carbonation resistance compared to concrete based on Portland cement [1][2][3][4][5][6], the process of concrete carbonation has moved into the focus of research. Conditions for accelerated testing in the laboratory, ranking of different cementitious systems and changes to the hydrate assemblages upon contact with CO 2 have been assessed in a multitude of studies [1,3,5,[7][8][9][10][11][12][13][14][15][16][17][18][19]. In comparison, little information has been published on gas diffusion in the carbonated material.…”

Section: Introductionmentioning

confidence: 99%

Steady-state O2 and CO2 diffusion in carbonated mortars produced with blended cements

et al. 2017

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The diffusion coefficient D O 2 , the porosity and the pore structure of mortars produced with a Portland cement and a range of blended cements containing limestone powder, microsilica, portlandite or slag were measured in the non-carbonated and the carbonated state. Additionally, the setup for measuring O 2 diffusion was adapted to measure also the CO 2 diffusion of the carbonated mortars. The diffusion coefficient D O 2 and the total porosity were increased in the mortars containing microsilica and slag, while they were decreased in the other mortars due to carbonation. Invariably, the pore structure became coarser in all samples. The relationship between diffusion coefficients D O 2 and D CO 2 in the carbonated mortars was always linear, with D O 2 systematically higher by factor of 1.37. As this factor broadly agrees with what was found in the scant literature about CO 2 diffusion, it could be used for estimating D CO 2 of carbonated mortar and concrete based on measurements of O 2 diffusion.

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Influence of Cyclic Humidity on Carbonation of Concrete

Cited by 37 publications

References 13 publications

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

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

Carbonation of concrete: the role of CO2 concentration, relative humidity and CO2 buffer capacity

Steady-state O2 and CO2 diffusion in carbonated mortars produced with blended cements

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