A model for the calculation of combined chemical reactions and transport processes and its application to the corrosion of mineral-building materials

Schmidt‐Döhl, Frank; Rostásy, Ferdinand

doi:10.1016/s0008-8846(99)00087-3

Cited by 30 publications

(17 citation statements)

References 5 publications

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“…Evaluation of expansion and cracking due to chemical attack was not included in the model. Another general framework was developed by Schmidt-Dohl and Rostasy [22] which was based on thermodynamic and kinetic considerations for evaluation of degradation of structures under chemical attack. This model can only be used for species with known thermodynamic data.…”

Section: Numerical Modeling Of Sulfate Attackmentioning

confidence: 99%

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Numerical simulation of cementitious materials degradation under external sulfate attack

Sarkar

Mahadevan

Meeussen

et al. 2010

Cement and Concrete Composites

187

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a b s t r a c tA numerical methodology is proposed in this paper to simulate the degradation of cementitious materials under external sulfate attack. The methodology includes diffusion of ions in and out of the structure, chemical reactions which lead to dissolution and precipitation of solids, and mechanical damage accumulation using a continuum damage mechanics approach. Diffusion of ions is assumed to occur under a concentration gradient as well as under a chemical activity gradient. Chemical reactions are assumed to occur under a local equilibrium condition which is considered to be valid for diffusion controlled reaction mechanisms. A macro-scale representation of mechanical damage is used in this model which reflects the cracking state of the structure. The mechanical and diffusion properties are modified at each time step based on the accumulated damage. The model is calibrated and validated using experimental results obtained from the literature. The usefulness of the model in evaluating the mineralogical evolution and mechanical deterioration of the structure is demonstrated.

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Section: Numerical Modeling Of Sulfate Attackmentioning

confidence: 99%

“…A continuum damage mechanics based model is used to relate the cracked state of the structure to the strain calculated from Eq. (22). The cracked state of the structure is manifested in a scalar quantity known as a damage parameter.…”

Section: Damage Accumulationmentioning

confidence: 99%

Numerical simulation of cementitious materials degradation under external sulfate attack

Sarkar

Mahadevan

Meeussen

et al. 2010

Cement and Concrete Composites

187

View full text Add to dashboard Cite

show abstract

“…Then, as in this cell the cross-section area is constant and we suppose the electro-neutrality of the electrolyte, it is possible to assume that the current density i is uniform in space and it has the same value at the anode and at the cathode. Therefore, as only reactions (A) and (C) are taken into account, expressions (8) and (12) should provide the same result.…”

Section: Boundary Conditionsmentioning

confidence: 99%

“…(8) and (12). The value of the concentrations at the electrodes are not needed, while the value of the potential at one of the electrodes can be fixed arbitrarily as only gradients of potential are involved in the model (we fix φ(1) = 0).…”

Section: Numerical Testmentioning

confidence: 99%