DIE ERMITTLUNG DER SPANNUNGEN INFOLGE VON SCHWINDEN UND HYDRATATIONSWAERME IM BETON.

The hydration of concrete gives rise to thermal expansion movements or - if these are restrained - to compressive stresses. These compressive stresses largely disappear as a result of plstic strain, especially within the first day. Then, when the concrete cools, tensile stresses develop at a very early stage. A new testing apparatus has been developed in which a 1 m long concrete beam is exposed to the same temperatures, humidity conditions and uniaxial deformation restraints as in an actual structure and the resulting stresses can be measured.