Mesoscopic modeling and simulation of the dynamic tensile behavior of concrete

3D meso-scale fracture modelling and validation of concrete based on in-situ X-ray Computed Tomography images using damage plasticity model

“…However, modelling such microscale thickness in a mesoscale continuum FE mesh may lead to too fine meshes along the ITZ and thus numerical difficulties. Therefore in most numerical studies, the ITZ thickness is set as 0.2-0.8 mm (Zhou and Hao, 2008a,b) and 0.5 mm (Song and Lu, 2012;Pedersen et al, 2013) heterogeneous and weaker than the mortar, yet the variation of the mechanical properties across the ITZ thickness is still not clearly understood. Therefore the ITZ mechanical properties are often assumed homogenous across the thickness for numerical convenience (Kim and Abu Al-Rub, 2011).…”

Towards a realistic morphological model for the meso-scale mechanical and transport behavior of cementitious composites

“…A survey of the existing literature shows numerous implementations of mesoscopic modeling of cementitious composites, and these generally focused on two main issues: the first being the morphological representation of the composite at the mesoscale, and the second related to the strain softening behavior of the cement mortar. Most have focused on either 2D representations using either circles or polygons [14,3], and the papers involving a full bore 3D analysis have been limited mostly to spherical representations, arranged in a regular [10] or random fashion [15,11,16]. One of the most recent contributions involved using realistic particles instead of the traditional spherical shapes in a mortaraggregate model by Refs.…”

“…These phenomena show that the mechanical response of such a composite involves multiple length scales defined at various levels [3]. The smallest length scale may be associated with the microstructure (cement paste) composed of water, hydrates (mainly CeSeH, Portlandite CH and hydrated sulfoaluminates) and anhydrous cement grains.…”

Multiscale dynamic fracture behavior of the carbon nanotube reinforced concrete under impact loading

“…In addition, Pedersen et al [34] mentioned that while the distribution of aggregates on mechanical properties of the concrete had negligible effects, the circular shape was the most common one used in the meso scale simulation of concrete. Different authors have used various volume fractions of aggregates.…”