The carbonation of concrete and the mechanism of moisture, heat and carbon dioxide flow through porous materials

Saetta, Anna; Schrefler, Bernhard A.; Vitaliani, Renato

doi:10.1016/0008-8846(93)90030-d

Cited by 259 publications

(122 citation statements)

References 7 publications

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“…The degree and extent to which the cementitious materials in the repository will alter to CaC03 will depend on a number of factors including, the atmospheric concentration of CO2 and H20, the temperature, and the rate of diffusion of CO2 into the cement (Saetta et al, 1993). When the CO2 concentration is high and diffusion is not a limiting factor, the conversion of finely divided calcium silicate hydrate minerals such as tobermorite or xonotlite to CaC03 and Si02 in the presence of CO2 at ambient temperature can be rapid (Goto, 1995;Martin, 1995;Meike, 1996).…”

Section: Cementitious Materialsmentioning

confidence: 99%

Materials to be used for radionuclide transport experiments (milestones SPL3A1M4)

Viani¹

1998

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Experiments to determine the effect of canister corrosion products on the transport of radionuclides will be undertaken using the Fe(II1) oxides goethite and hematite as proxies for the expected corrosion envelope that will form as a result of alteration of the corrosion allowance overpack prior to the breaching of the waste container. Samples of ESF invert concrete that have been crushed, or left intact but fractured, and that have been subjected to hydrothermal alteration will be used to determine the effect of cementitious materials on transport of radionuclides. A mixture of CaC03, SiO,, and aggregate will be used as a proxy for completely carbonated concrete.

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Section: Cementitious Materialsmentioning

confidence: 99%

Materials to be used for radionuclide transport experiments (milestones SPL3A1M4)

Viani¹

1998

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“…Saetta et al [24,25] proposed a model to simulate all the phenomena based on carbonation process considering the multidimensional transport of moisture, heat, and carbon dioxide through concrete and taking in account the reduction of the porosity due to carbonation. Burkan Isgor and Razaqpur [10] built a nonlinear nite element approach for tracing the spatial and temporal advancement of the carbonation front in concrete structures with and without cracks.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation on Carbonation Depth of Concrete Structures considering Time- and Temperature-Dependent Carbonation Process

Peng

Tang

Zhang

et al. 2018

Advances in Materials Science and Engineering

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In order to further understand the carbonation process of concrete structures, the time-and temperature-dependent diffusion process of CO 2 in concrete is simulated based on the law of the CO 2 mass conservation, and a two-dimensional mass transfer equation is established for the CO 2 diffusion in concrete. e concrete block is discretized into triangular elements, and the CO 2 concentrations at different positions are calculated based on finite element method. A computational algorithm is programed through the Matlab platform. e time-and temperature-dependent property and difference of the CO 2 concentration at different positions of the structure are considered in the proposed model. en, an accelerated carbonation experiment is carried out using concrete blocks with different mix proportions to investigate the influence of the water-cement ratio and temperature on the concrete carbonation. e experimental results effectively verify the correctness of the finite element model, and the proposed finite element method reasonably simulates the concrete carbonation through calculating the carbonation in practical engineering compared with other methods in references. An experimental-numerical correlation has been performed. e ratio of carbonation depth at the corner of the concrete members to the other positions is about 1.35. e carbonation depth is increased about 1.9 times when the temperature changes from 20°C to 40°C.

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“…Carbonation and chloride ion attack in concrete are the most common causes of steel corrosion in reinforced concrete (Ahmad, 2006;Fu and Chung, 1997;Saetta et al, 1993;Ho and Lewis, 1987;Neville, 2004;Broomfield, 1997). It is expected that carbonation attack would be different since it differs from one place to another due to difference in pollution.…”

Section: Introductionmentioning

confidence: 99%

Carbonation-induced corrosion minimization in steel reinforced concrete structures

Abaho

2017

Int. j. adv. appl. sci

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The aim of the work was to find out the corrosion condition, cause and remedial solution for reinforced concrete structures located at non coastal regions. Concrete cover thickness ranged from 12cm to 50cm. Rebound hammer strength ranged from (12-28) N/mm2. The pH ranged between 8 and 12 but 85% of pH was below 10. Results show that for corrosion conditions more than 80% quai-situation value lay between (-0.420 and 0.380) VCSE which indicates high probability of corrosion of reinforcement. Real structures surveyed also indicated that they were devoid of maintenance schedules. Irrespective of structural member, survey data on analysis indicate an average carbonation coefficient (K) of 3.83mm/year 0.5 in concrete structure exposed to Bangalore atmosphere. Hence, the study indicates that regular maintenance schedules for reinforced concrete structures are essential with preventive approach. Carbonation induced corrosion was accelerated by 490ppm concentration of Carbon dioxide in the surrounding environment of the surveyed structures. It was facilitated by the deficiency in construction practices like inadequate concrete cover, high w/c ratio hence poor quality of concrete in general.

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The carbonation of concrete and the mechanism of moisture, heat and carbon dioxide flow through porous materials

Cited by 259 publications

References 7 publications

Materials to be used for radionuclide transport experiments (milestones SPL3A1M4)

Materials to be used for radionuclide transport experiments (milestones SPL3A1M4)

Numerical Simulation on Carbonation Depth of Concrete Structures considering Time- and Temperature-Dependent Carbonation Process

Carbonation-induced corrosion minimization in steel reinforced concrete structures

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