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Abstract: In this paper, the influence of aggregate size and volume fraction onshrinkage induced micro-cracking and permeability of concrete and mortar wasinvestigated.
Nonlinear finite element analyses of model concrete and mortarspecimens with regular and random aggregate arrangements were performed.
Theaggregate diameter was varied between 2 and 16 mm.
Furthermore, a range ofvolume fractions between 0.1 and 0.5 was studied.
The nonlinear analyses werebased on a 2D lattice approach in which aggregates were simplified as monosizedcylindrical inclusions.
The analysis results were interpreted by means of cracklength, crack width and change of permeability.
The results show thatincreasing aggregate diameter at equal volume fraction and decreasing volumefraction at equal aggregate diameter, increases crack width and consequentlygreatly increases permeability.



Autor: Peter Grassl, Hong S.
Wong, Nick R.
Buenfeld


Fuente: https://arxiv.org/



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