International Journal for Restoration of Buildings and Monuments vol:12 issue:3 pages:187-204
Diffusion-convection transport through differently oriented cracks is investigated in cell experiments. Testing two perpendicular directions of the cracks proves the existence of rotational convective flow in cell experiments. Despite the saturated condition and the equal water levels at both sides of the sample at the start of the test, the results can not be explained by a concentration dependent diffusion only. Additional convective transport takes place due to a difference of hydrostatic pressure in both cells. Based on these findings a 3D model is developed to simulate the measured transport through isolated cracks. Subsequently, it was possible to simulate transport through cracked ceramic brick, revealing dominant transport through the cracks, largely overpassing transport through the uncracked porous zones.