Capillary rise is an important cause of deterioration for plaster in building. This phenomenon has been studied by the tensiometric\r\nexperimental technique. Structural and hydric characteristics of plaster have been determined.Decane, a perfectly impregnate fluid,\r\nhas been used to calculate the porous constant characteristic called ???? and other structural parameters like pore radius and specific\r\nsurface. Evaluation of the sensibility of plaster for water has been evaluated in a second time. The angle constant and the capillary\r\nmoisture content have been determined. A comparison between results for plaster and composite plaster with fiber has been done.\r\nThe addition of glass and hemp fiber does not have important effect on hydric properties (angle constant), but we have observed\r\ninfluence on structural charecteristics (pore radius, porosity, and degree of heterogeneity).
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