Compressive and tensile creep of early age concrete with mineral additives

The creep behavior of concrete is one of several key properties that determine the stress build-up and subsequent crack sensitivity of structural members subjected to restraint conditions. Creep tests in compression and tension have been performed as a part of a Ph. D. project, and the paper gives an overview of the test program, as well as experimental examples. The experimental results show that mineral additives (fly ash and granulated blast furnace slag) increase early age creep and display different creep behaviour in compression and tension. The paper discusses the consequence of using compressive and/or tensile creep data in stress calculations.