This paper contains information regarding durability of mortars/concrete with cement with 0%, 10% and 20% metakaolin addition (MK). Durability was assessed by determinations on the mortar such as water absorption, freeze-thaw resistance, shrinkage and behavior in sulfate solution (MgSO₄, K₂SO₄) and on concrete: workability, volume of entrapped and entrained air, mechanical strength and permeability tests.

The results indicate that MK is a pozzolanic addition, which can be used in the production of composite cements with good physical, mechanical and chemical properties. Studies have revealed MK’s favorable effect on the properties over time of mortars and concretes.

The mortars based on cement with MK additions exposed to sulfate solutions have a good
behavior up to one year exposure. The sulfates resistance of MK cements has to be correlated with the decrease in C₃A content by partially replacing clinker with MK.