Abstract
Abstract Concrete is a composite material with dense aggregates embedded in a porous matrix. Hence moisture transfer is limited to water and vapour movement through the porous system of hardened cement paste and along the interface. It is shown that it is reasonable to subdivide the structure of concrete into three different levels. This concept is now called the 3L-approach. The micro-level serves to describe moisture transfer mechanisms. The meso-level has been introduced to take the composite structure of concrete into consideration and finally the macrolevel is used to formulate realistic material laws. The reliability of this approach is underlined by an arbitrarely chosen example, i.e. drying of a concrete element. It is shown that the time-dependent moisture distribution can be obtained for variable relative humidities of the environment.
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