Influence of porosity and water content on the diffusivity of CO2 and O2 through hydrated cement paste

Houst, Y. F.; Wittmann, Folker H.

doi:10.1016/0008-8846(94)90040-x

Cited by 264 publications

(146 citation statements)

References 6 publications

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“…One important side of the knowledge of these blended mortars is the study of the microstructure and related properties, which gives information about: i) the future degradation of the material [3,4]; ii) transport and accumulation of water [5]; iii) kind of diffusion of gases through the material [6], and, related with this, the kinetic of some reactions that can take place [7].…”

Section: Introductionmentioning

confidence: 99%

Blended pastes of cement and lime: Pore structure and capillary porosity

Arandigoyen

Álvarez

2006

Applied Surface Science

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Microstructure of blended pastes of lime and cement were studied in this paper. An increment of complexity of the microstructure was found when pastes increase their percentage in cement. Microstructural characteristics as porosity, morphology of the pores, pore size distribution and surface fractal dimension were evaluated in the different pastes studying the modification with the variation of composition. The capillary water absorption is also evaluated obtaining higher capillary coefficients values for the pastes with higher amounts of lime. The increase of complexity of the microstructure, due to the cement in the pastes, leads to slight deviations of the parallel tube model.

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Section: Introductionmentioning

confidence: 99%

Blended pastes of cement and lime: Pore structure and capillary porosity

Arandigoyen

Álvarez

2006

Applied Surface Science

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“…One of the reasons to this is that the porosity structure is changed by calcium carbonate created by carbonation. Papadakis et al (1991) and Wittmann et al (1994) suggest the diffusion coefficient equation which uses spread disk cell to measure percentage of porosity in concrete and relative where w is the moisture content (%) Fukushima (1991) suggests that concrete inside calcium hydroxide reverse diffusion coefficient D Ca OH ð Þ 2 in Eq. (9) may be expressed as an exponential function with moisture content (%) as a variable.…”

Section: Diffusion Coefficient Of Carbon Dioxide and Calcium Hydroxidmentioning

confidence: 99%

Study on Neutralization Progress Model of Concrete with Coating Finishing Materials in Outdoor Exposure Conditions Based on the Diffusion Reaction of Calcium Hydroxide

Park

Hasegawa

Senbu

et al. 2012

Int J Concr Struct Mater

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In order to predict the neutralization of concrete which is the reaction of carbonation dioxide from the outside and cement hydration product, such as calcium hydroxide and C-S-H, it was studied the numerical analysis method considering change of the pore structure and relative humidity during the neutralization reaction. Diffusion-reaction neutralization model was developed to predict the neutralization depth of concrete with coating finishing material. In order to build numerical analysis models considering outdoor environment and finishing materials, the adaption of proposed model was shown the results of existing outdoor exposure test results and accelerated carbonation test.

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“…Even though mass factor has not been found in the previous papers studied the changes in microstructure properties produced by the carbonation [1][2][3], it seems adequate to use this mass factor in order to take into account the change of mass produced as consequence of the carbonation process. Table 4 shows the intrudable porosity results of the carbonated and non-carbonated pastes, obtained by mercury intrusion porosimeter.…”

Section: Mass Factormentioning

confidence: 99%

“…Johannesson and Utgenannt [2] studied the change of specific surface area of cement mortar using BET theory. As a result of comparing carbonated and non-carbonated cement pastes, Houst [3] observed that the amount of water adsorbed decreased with carbonation. Dias [4] analyzed the reduction of concrete sorptivity with carbonation.…”

Section: Introductionmentioning

confidence: 99%

“…Dias [4] analyzed the reduction of concrete sorptivity with carbonation. Rodríguez-Navarro et al [5] studied the formation of Liesegang rings (concentric CaCO 3 and Ca(OH) 2 non-carbonated alternatively) in lime mortars as a consequence of the carbonation process. Bertos et al [6] discussed the variations of different properties (permeability, porosity, tortuosity, and pore size distribution) as a consequence of the carbonation process in cement based materials.…”

Section: Introductionmentioning

confidence: 99%

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Variation of microstructure with carbonation in lime and blended pastes

Arandigoyen

Biçer-Şimşir

Álvarez

et al. 2006

Applied Surface Science

133

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ABSTRACT:Carbonation, as a reaction of the curing process of both, cement and lime binders, modifies the microstructure. Several microstructure properties, namely, porosity, pore size distribution, surface fractal dimension and specific surface area have been investigated in this study to describe the effect of carbonation on microstructure. Both carbonated and non-carbonated pastes of lime and blended pastes of lime and cement having varying W/B (water/binder) ratios are studied. Results show that carbonation decreases the porosity, but not with the same intensity in all pore size ranges. The highest modification is between 0.03 and 0.01 µm in lime pastes and between 0.2 and 0.02 µm in 50% lime pastes, while in 80% lime pastes the modification is very small. It is also observed that carbonation is a function of the binder composition but not of the W/B ratio. Moreover, surface fractal dimension decreases during the carbonation process, while the specific surface area varies depending of the binder composition.

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Influence of porosity and water content on the diffusivity of CO2 and O2 through hydrated cement paste

Cited by 264 publications

References 6 publications

Blended pastes of cement and lime: Pore structure and capillary porosity

Blended pastes of cement and lime: Pore structure and capillary porosity

Study on Neutralization Progress Model of Concrete with Coating Finishing Materials in Outdoor Exposure Conditions Based on the Diffusion Reaction of Calcium Hydroxide

Variation of microstructure with carbonation in lime and blended pastes

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