In the case of injection into masonry the injection material is injected continuously via low pressure packers, which are in offset arrangement in the form of a grid, at low pressure (low pressure process). In this manner the faulty joints as well as the capillaries, pores and hollow cavities in the bricks are filled in with the injection material.
The continuous injection into the masonry is applied in cases when the previous surface sealant, e.g. an older bituminous sealant, has become defective.
For filling, sealing and consolidation of masonry
Surface injection into masonry
For the surface injection into masonry as well as for the retrofitting of a horizontal damp-proof barrier the two component injection resins PUR-O-RIP and PUR-O-RIP LV are especially suitable
Following the blending of the components, the injection material in injected into the masonry via 1-K injection pumps, for example the CONTRACTOR 1 U. The masonry must be insulated prior to the injection process e.g. with F300 in order to prevent the escape of material and pressure loss.
Injection into sandstone
Retrofitting of horizontal damp-proof barriers with RUBBERTITE is undertaken in brick masonry as well as in natural stone structures for example sandstone. Besides the low viscosity RUBBERTITE also has the benefit that it does not leave stains on the surface of the sandstone, as would occur if Polyurethane resin were employed.
A large cellar comprising dimensions of 400 m2 that was formerly used as a wine cellar is located beneath the Chamber of Commerce, in which on a approx. 2 m thick foundation of bricks and mortar twelve mighty pillars made of Oberkirchen Sandstone support the building together with the brick walls possessing a thickness of up to 1.80 m.
As a result of the omission of horizontal damp-proof barriers in the sandstone pillars as well as due to the brickwork walls, the load-bearing basic structure of the building was subject to considerable damage due to the humidity rising through the capillaries.
Post-applied horizontal barrier
A special case in masonry injection processes is the retrofitting of a horizontal damp-proof barrier, which is employed if the existing surface sealant is still intact and it is solely rising humidity in the capillaries that is causing the damage.
In this case a grid of drill holes is arranged generally low lying directly over the floor wall connection, at which at least two horizontal joints are pierced by diagonal drill holes.
Pressureless injection into masonry
The renovation was accomplished by the subsequent installation of a low-lying horizontal damp-proof barrier by means of the injection of RUBBERTITE. A range of preliminary investigations was conducted prior to commencement of the reconstruction measures in order to establish the sustainability of the redevelopment. For example sample injections using dyed Injizierter Probekörper injected sample acrylate gel into sandstone structures were undertaken to verify the penetration behaviour to be able to draw conclusions concerning the packer clearance to be selected.
A special drilling grid was plotted at the foot of the sandstone pillars as a result of the findings of the preliminary investigations. The injection procedure was carried out with RUBBERTITE with the reaction time set at approx. 10 minutes in low pressure operation with the injection machine running slowly. In this way it was possible to achieve an optimal distribution of the injection material in the homogenous structures of the sandstone.