Abstract: The aim of the study was to evaluate creep and shrinkage of concrete beams containing tuff aggregates (TA) as a partial replacement of coarse aggregate (CA). This was done at 0, 12.5, 25, 50, 75 and 100 % replacement levels. The methods used was characterization of TA, CA and Fine Aggregates (FA), mineralogical characterization of TA, compressive strength, modulus of elasticity of the cast concrete and loading 0.2 x 0.2 x 1.0 m beam specimens with dead weights for 60 days. Four beams of C45 were cast to test creep, whereby two had 0 % replacement and another two had 100 % replacement levels of CA.