Möglichkeiten und Grenzen der Drucklosen Injektionsmittel - Applikation in Mauerwerksbaustoffen

Abstract

All over the world, many buildings and in particular cultural monuments are affected by rising damp due to a missing or non-functional horizontal sealing however their preservation would be valuable for future generations. One possible remedy is the application of a subsequent horizontal sealing by means of a pressureless injection method but the results are often varying or even inadequate so that in consequence the method itself is frequently questioned. This phenomenon prompted the fol-lowing research on the possibilities and limitations of the pressureless injection method on com-mon building materials. As a result of the investigations mentioned before, several factors have a limiting effect on the spreading of an injection agent, in which case the prevailing factor is the existing degree of mois-ture penetration of the building material. Based on the results obtained, it is possible to derive a model of the spreading of an injection agent in building materials and therefore it is possible to make a prediction regarding the effect of the sealing. It was also found that the combination of the injection agent used and the build-ing material produces specific results that cannot be transferred to other building material/in-jection agent combinations. In addition to this, it is possible to present the distribution of an injection agent in the building material three-dimensionally with the help of neutron imaging. By means of methods such as Neutron Radiography and Neutron Tomography it can be proven that the distribution of an in-jection agent in the inner part of a building material is not homogenous: the concentration is higher at the edges of the impregnated samples, caused by variations in moisture content. In summary, the results provide valuable information regarding the widely differing sealing re-sults in construction practice and show possibilities for optimizing the planning and execution of the method.