Often concrete structures cannot be regarded as monolithic since discontinuities like cracks and joints develop inevitably during construction and service life. Joints are not only introduced coincidentally at interfaces of different concreting steps, they are also induced deliberately to release stresses due to thermal actions or shrinkage in a controlled manner. This results in a change of material properties at the joint and is often investigated from a mechanical point of view. However, joints are also changing locally the moisture transport properties of a structure and thus considerably affecting the durability of those. Given the lack of data in the literature, in the presented work the distribution of the joint aperture and hydraulic conductivity is measured for a set of aged concrete expansion and cold joints. It is shown that the distribution of the apertures can be modeled with common probability distribution functions, which allow a relation between saturation and capillary potential. The parallel plate model is found to be a good estimate for the hydraulic conductivity of the joints when the available void areas of the joint are considered.

混凝土结构通常不能被视为整体结构，因为在施工和使用寿命期间不可避免地会出现裂缝和接缝等不连续性。接头不仅在不同的混凝土浇筑步骤的界面处同时引入，而且还被有意诱导以受控方式释放由于热作用或收缩引起的应力。这会导致接头处的材料特性发生变化，因此通常从机械角度进行研究。然而，接缝也在局部改变结构的水分输送特性，从而显着影响结构的耐久性。鉴于文献中缺乏数据，在目前的工作中，测量了一组老化混凝土膨胀和冷接缝的接缝孔径和水力传导率的分布。结果表明，孔的分布可以用常见的概率分布函数建模，这允许饱和度和毛细管势之间的关系。当考虑接头的可用空隙区域时，发现平行板模型是接头水力传导率的良好估计。