3D-Mesomechanical analysis of external sulfate attack in concrete

The present study focuses on degradation of concrete by external sulfate attack. The numerical model developed by the MECMAT/UPC group, incorporates coupled C-M analysis using a meso-mechanical approach with discrete cracking, using the MEF and zero thickness interface elements with a constitutive law based on nonlinear fracture mechanics concepts. Examples of application are run on 2D and 3D samples, with geometries and FE meshes generated with a code developed also in-house. The numerical analysis is carried out using two independent codes and a “staggered” procedure. The first code performs the mechanical analysis and the second the diffusive/reaction chemical problem. 2D uncoupled and coupled analysis are presented and discussed. Preliminary coupled 3D results are also presented and compared with equivalent 2D results, and the differences are detected and analyzed

TASARTE [Material gráfico]

Copia digital. Madrid : Ministerio de Educación, Cultura y Deporte, 201

Modelització mesomecànica 3D d'atac sulfàtic en formigó.

La degradació per atac sulfàtic en formigó es causada per l'entrada de ions sulfat des de l'exterior del material, que es difonen pels pors de la pasta de ciment. Els sulfats es combinen amb la portlandita existent en la pasta de ciment creant guix, i aquest amb els aluminats també presents en la pasta hidratada, precipitant etringita secundaria que causa expansions volumètriques de la pasta i la subseqüent fissuració que a la seva vegada accelera l'entrada de sulfats i la degradació del material

Modelització mesomecànica 3D d'atac sulfàtic en formigó.

La degradació per atac sulfàtic en formigó es causada per l'entrada de ions sulfat des de l'exterior del material, que es difonen pels pors de la pasta de ciment. Els sulfats es combinen amb la portlandita existent en la pasta de ciment creant guix, i aquest amb els aluminats també presents en la pasta hidratada, precipitant etringita secundaria que causa expansions volumètriques de la pasta i la subseqüent fissuració que a la seva vegada accelera l'entrada de sulfats i la degradació del material

3D-Mesomechanical analysis of external sulfate attack in concrete

The present study focuses on degradation of concrete by external sulfate attack. The numerical model developed by the MECMAT/UPC group, incorporates coupled C-M analysis using a meso-mechanical approach with discrete cracking, using the MEF and zero thickness interface elements with a constitutive law based on nonlinear fracture mechanics concepts. Examples of application are run on 2D and 3D samples, with geometries and FE meshes generated with a code developed also in-house. The numerical analysis is carried out using two independent codes and a “staggered” procedure. The first code performs the mechanical analysis and the second the diffusive/reaction chemical problem. 2D uncoupled and coupled analysis are presented and discussed. Preliminary coupled 3D results are also presented and compared with equivalent 2D results, and the differences are detected and analyzed

3D-mesomechanical analysis of external sulfate attack in concrete

The present study focuses on degradation of concrete by external sulfate attack. The numerical model developed by the MECMAT/UPC group, incorporates coupled C-M analysis using a meso-mechanical approach with discrete cracking, using the MEF and zero thickness interface elements with a constitutive law based on nonlinear fracture mechanics concepts. Examples of application are run on 2D and 3D samples, with geometries and FE meshes generated with a code developed also in-house. The numerical analysis is carried out using two independent codes and a “staggered” procedure. The first code performs the mechanical analysis and the second the diffusive/reaction chemical problem. 2D uncoupled and coupled analysis are presented and discussed. Preliminary coupled 3D results are also presented and compared with equivalent 2D results, and the differences are detected and analyzed