Coupled chemo-mechanical deterioration of cementitious materials Part II: Numerical methods and simulations

Kuhl, Detlef; Bangert, Falko; Meschke, G.

doi:10.1016/j.ijsolstr.2003.08.004

Cited by 74 publications

(59 citation statements)

References 21 publications

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“…Equation (1) can be transformed into the so-called weak form, analogous to the principle of virtual power in mechanics, see, e.g., (Germain 1973;Kuhl et al 2004;Zienkiewicz et al 2005;Maugin 2013), through multiplication with an arbitrary test function c(x), and integration over the domain of the RVE, yielding…”

Section: Representative Volume Element For Diffusive Transport In Cemmentioning

confidence: 99%

Self-Consistent Channel Approach for Upscaling Chloride Diffusivity in Cement Pastes

et al. 2017

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Chloride ingress into concrete is a major cause for material degradation, such as cracking due to corrosion-induced steel reinforcement expansion. Corresponding transport processes encompass diffusion, convection, and migration, and their mathematical quantification as a function of the concrete composition remains an unrevealed enigma. Approaching the problem step by step, we here concentrate on the diffusivity of cement paste, and how it follows from the microstructural features of the material and from the chloride diffusivity in the capillary pore spaces. For this purpose, we employ advanced self-consistent homogenization theory as recently used for permeability upscaling, based on the resolution of the pore space as pore channels being oriented in all space directions, resulting in a quite compact analytical relation between porosity, pore diffusivity, and the overall diffusivity of the cement paste. This relation is supported by experiments and reconfirms the pivotal role that layered water most probably plays for the reduction of the pore diffusivity, with respect to the diffusivity found under the chemical condition of a bulk solution.Keywords Diffusion · Homogenization · Chlorides · Multiscale modeling · Layered water List of Symbols Mathematical operators divDivergence operator, applied to a vector field div Divergence operator, applied to a second-order tensor field grad Gradient operator on the microscopic observation scale of pore space

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Section: Representative Volume Element For Diffusive Transport In Cemmentioning

confidence: 99%

Self-Consistent Channel Approach for Upscaling Chloride Diffusivity in Cement Pastes

et al. 2017

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“…Mechanical damage accelerates the chemical degradation as a consequence of improving transport properties. 2 Many of the concrete degradation processes have several potential causes, and it is difficult to separate which causes are responsible for observed damage. Early reported research results, for example, were unable to distinguish between damage caused by heat and damage cause by radiation (see Reference 1).…”

Section: Status Of Existing Researchmentioning

confidence: 99%

“…2,30 The interactions between the structural materials and the environment must be considered and modeled (see Reference 23). The modeling of carbonation in concrete is a complex problem which requires, for realistic simulation, a systematic and robust finite element approach (see Reference 24).…”

Section: Age Projectionmentioning

confidence: 99%

Literature Review of the Effects of Radiation and Temperature on the Aging of Concrete

Fillmore¹

2004

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The open literature and accessible United States Department of Energy-sponsored reports were reviewed for the effects of radiation and temperature on concrete. No effects of radiation were found for exposures less than 10 10 neutron/cm 2 or 10 10 Gy gamma for periods less than 50 years. Reductions in compressive and tensile strength and a marked increase in volume are reported for exposures greater than 10 20 neutron/cm 2 or 10 10 rads of gamma. There are conflicting reports of damage for doses in the middle ranges. v SUMMARY Concrete has been used in the construction of nuclear facilities because of two primary properties, its structural strength and its ability to shield radiation. Concrete structures have been known to last for hundreds of years, but they are also known to deteriorate in very short periods of time. The use of concrete in nuclear facilities for containment and shielding of radiation and radioactive materials has made its performance crucial for the safe operation of the facility. The accessible literature was searched for reports on the effects of radiation and temperature on concrete deterioration.The effects of low doses, <10 10 neutron/cm 2 or <10 10 Gy gamma, of radiation over periods of less than 50 years do not seem to have a significant effect on the concrete. Longer-term exposure, over 100 years, has not been studied.

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“…Therefore, it is still important to establish a reasonable prediction theory on the service life of concrete structure in marine environment. Kuhl et al [21,22] suggested a new theoretical frame, which includes the coupling effect of chemistry and mechanics, to analyze the degradation of cementitious materials due to calcium leaching and mechanical damage. Nevertheless, few works on the degradation of concrete under sulfate attack have been reported.…”

Section: Introductionmentioning

confidence: 99%

A new chemo-mechanical model of damage in concrete under sulfate attack

Chen

Song

2016

Construction and Building Materials

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Coupled chemo-mechanical deterioration of cementitious materials Part II: Numerical methods and simulations

Cited by 74 publications

References 21 publications

Self-Consistent Channel Approach for Upscaling Chloride Diffusivity in Cement Pastes

Self-Consistent Channel Approach for Upscaling Chloride Diffusivity in Cement Pastes

Literature Review of the Effects of Radiation and Temperature on the Aging of Concrete

A new chemo-mechanical model of damage in concrete under sulfate attack

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