The early-age basic tensile creep response of concrete has been investigated only scarcely in the literature. The majority of past work on creep of concrete has been concerned with the compression creep behavior of mature concrete. However, detailed knowledge about the tensile creep behavior at early ages is important for estimating the possibility of cracking due to shrinkage and thermal stresses. Former work includes the results obtained by Gutch and Rosta´sy [1]. Their tensile creep tests showed pronounced viscoelasticity when the load was applied at early age. Moreover, they concluded that the initial stress/strength ratio does not exert a very significant influence on creep. Umehara and Uehara [2] demonstrated the influence of temperature on early-age tensile creep. Bissonnette and Pigeon [3] identified
the w/c ratio and the age at loading as significant parameters for tensile creep at early age. Their experiments showed a higher specific creep when the w/c ratio increases. Westman [4] determined the early-age creep in compression and his results indicated a strong age dependency when the sample was loaded within the first 24 h after set. Altoubat [5] and Altoubat and Lange [6] found that the initial rate of basic creep is very sensitive to the age at loading in the first 2 days.