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CASPAR J.W.P. GROOT

ABSTRACT

The transport of water from mortar to brick, occurring immediately after bricklaying, may be approximated by modelling (i) the brick according to the Capillary Pressure
Theory for Porous Solid Media and (ii) the mortar according to Pressure Theories for Particle Systems containing Liquids (Schubert, Luikov). Using these theories water absorption characteristics of the brick and the counter-acting water retention of the mortar may be evaluated.

In the paper the modelling of brick and mortar is described. Next, a qualitative comparison is made of the water loss occurring in different fresh mortars as a result of the brick suction of various brick types. Finally, the results are related to experimental data obtained from water flow measurements in a series of brick-mortar-brick combinations.

It may be concluded, that the interactive effects of capillary suction of mortar and brick on the final water distribution and the Water flow can qualitatively be compared through this approach.

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