1. Bericht: Introduction and aim of report: The hardening of Portland cement and of concrete is in conjunction with other reactive binder components (e.g. pulverised blast furnace slag GBFS, fly ash PFA, silica fume SF) associated with the liberation of heat of hydration. Many parameters are involved in this process ... 2. Bericht: Abstract: For the prediction of the mechanical properties of eary age concrete, as well as for the prediction of thermas stresses it is essential to know the initial degree of hydration, from wich on the development of stiffness and strength begins and which denotes the so-called domant phase of concrete´s hydration... 3. Bericht: Introduction: Concrete is a quasi-brittle material. In deformation-controlled uniaxial teste of concrete prisms, one oberves a gradual softening after reaching the maximum load ...