Synopsis This paper describes a series of experiments carried out on concrete under uniaxial tensile stress, using a test method developed previously. The properties assessed include the effect of mix proportions and curing conditions upon the short-term failure stress and strain and upon the tensile creep under a load of 35% of the ultimate short-term strength. The effect of variable humidity states upon the tensile creep was also investigated, and the results interpreted from the viewpoint of creep hypotheses for compressive loading. Where possible, the observed effects are related to the microstructure of cement gel. Finally, the effects upon creep of the level of loading and of the long-term strength of concrete in tension have been determined, and compared with the established behaviour in compression.