This article presents the evaluation of mechanical and durability properties of blended mortars.A volcanic tuff (TV) and an ash of sugar cane bagasse (CBC), in proportion of 10 to 20% cement replacement, were used as additions.The raw materials were characterized using the techniques of X-Ray Fluorescence, laser granulometry, X-ray diffraction (XRD) and Scanning Electron Microscopy (SEM and EDS). In blended mortars were performed compressive strength and durability t e s t s ( a b s o r p t i o n a n d p o r o s i t y, capillary suction, chloride permeability and susceptibility to carbonation).Additionally, the corrosion behavior of embedded structural steel exposed to three different media: water, sodium chloride (NaCl 3,5%) and presence of CO 2 , was studied.The susceptibility to carbonation was realized in an environmental chamber at accelerated conditions (1 % CO 2 , 100% CO 2 , 65% RH and 25 °C).It is found that the characteristics of the addition (chemical composition, morphology and particle size), are crucial for a good performance of the blended mortars, and the mechanical strength is not a definitive parameter to conclude about the durability of a material in a given environment exposure.