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Their function is to absorb structural stresses (subsidence of the ground, winds, seismic activity, etc.), functional stresses (vibrations, transitory oscillations, etc.) and thermal stresses (expansion and contraction of the materials). The depth of control joints or contraction joints is generally around 1/3 of the thickness of the cementitious conglomerate and are made by cutting into the surface with a diamond-tipped disk after the conglomerate has hardened (usually 24-48 hours). They do not eliminate cracks caused by hygrometric shrinkage, but help to contain their formation and width so that any cracks that form do not provoke functional or aesthetic problems. Expansion joints are interruptions in the continuity of the surface .
Their function is to absorb structural stresses (subsidence of the ground, winds, seismic activity, etc.), functional stresses (vibrations, transitory oscillations, etc.) and thermal stresses (expansion and contraction of the materials). The depth of control joints or contraction joints is generally around 1/3 of the thickness of the cementitious conglomerate and are made by cutting into the surface with a diamond-tipped disk after the conglomerate has hardened (usually 24-48 hours). They do not eliminate cracks caused by hygrometric shrinkage, but help to contain their formation and width so that any cracks that form do not provoke functional or aesthetic problems. Expansion joints are interruptions in the continuity of the surface .