20 Pages


The response of 210 (14 series of 15 specimens) mortar beams of 50*50*170 mm3 loaded in four points bending is analyzed. Two degrees of disorder are considered : (a) a 'material' disorder related to the intrinsic inhomogeneities of the material (sand, hydrated cement paste, ...), (b) a 'macroscopic' disorder created by the presence of cylindrical holes which cross the beam from the front face to the rear face (these holes have been artificially introduced by the presence of steel rods crossing the formwork).