Abstract: The effect of weathering on the physical and mechanical properties of marbles has been studied. Prior to the experiments fresh marble specimens were subjected to laboratory weathering. Water absorbtioncapacity of the weathered and fresh specimens was determined as weight percent (Wn, Wo) and a relationship has been established with thedegree of weathering (Dw ) as;

Dw = Wn—Wo / Wo

It is observed that with the increase of (Dw) water absorbtion capacity,porosity and unit volume increases but unit weight and compressionalstrength decreases.