Nachträgliche Horizontalabdichtung von Bruchsteinmauerwerk mittels Injektionsverfahren

Post-construction horizontal waterproofing of quarry stone masonry by means of injection technology.

In the context of the research project Hydrophobic and/or capillary-obstructing injection materials, subsidised by the Austrian Research Promotion Agency (FFG), hydrophobic and/or capillary-obstructing injection materials for post-construction horizontal waterproofing of quarry stone masonry were tested with regard to effectiveness and limitations of application, in consideration of the way in which the injection material is introduced.

The effectiveness of seven injection materials was tested on four different types of stone that are typical of masonry in Vienna (St. Margarethen sandy limestone, Leitha limestone, Rohrbach conglomerate, and quartz sandstone from the Flysch zone), for different degrees of dampness (low, medium, high) and different ways of introducing the sealing material (cardboard tube, flexible plastic tube, paste injection, pressure injection). The tests were carried out in the laboratory, on test pillars built for this purpose and two buildings.

Regarding the effects of hydrophobic and/or capillary-obstructing injection materials for post-construction horizontal waterproofing of quarry stone masonry, the tests performed have shown highly diverse results: therefore, before injections are applied, it is necessary in each case to analyse the physical properties of the masonry in question in the context of building diagnostics in order to be able to select an injection material that is suitable for this object.