Abstract: Apparatus for preserving porous structures, including masonry structures with embedded structural steel or reinforcing steel elements, applies a liquid preservative material to an exposed surface of the structure using the force of a compressed air blast at high velocity to meet, atomize, and inject the liquid preservative deeply into the porous structure. Separate manifolds each having multiple spaced nozzles are provided for the liquid preservative and for the air blasts, both manifolds being covered by a shroud. The manifolds and their nozzles are positioned and arranged so that, as the liquid is deposited on the surface of the structure, the high-velocity blast of air, arriving at the same area at the same time, atomizes, injects and forces the liquid into the interior of the structure, so as to coat the intersticies of the inner porous structure, including any reinforcing steel therein, the high-velocity air blast acting as a fluid hammer.

Abstract: A method for preserving porous structures, including masonry structures having embedded structural or reinforcing steel rods, applies liquid preservative material to an exposed surface of the structure and injects the material into the structure using the blasting force of a compressed air stream at high velocity. The apparatus for practicing the method includes separate manifolds having multiple outlet nozzles provided for the liquid material and for the air streams, both manifolds covered by a shroud. The manifolds and their nozzles are arranged so that, as the liquid is applied to the surface of the structure, the high velocity air forces or injects it into the interior of the structure, so as to coat the interstices of the inner porous structure including any reinforcing steel therein, the high velocity air streams acting as a fluid hammer. The preservation of the structures occurs without the need of disturbing, breaking open or repairing brick, concrete or masonry structures.

Abstract: A thermally insulated masonry wall comprising a plurality of thermally insulated barrier layers extending laterally inwardly from the surface of the wall. This is accomplished by placing a nozzle against the surface of the wall and blasting a pulsating air stream containing a thermal insulating liquid which penetrates through the surface of the wall to provide a first barrier layer embedded deeply in the wall and laterally spaced inwardly from its surface. A second operation provides a second but shallower barrier layer. This can be followed by a third or more applications. Each of the resulting barrier layers comprises particles of masonry material coated with thermal insulating liquid and entrapping air in the interstices formed by the coated masonry particles.

Abstract: Apparatus for applying a liquid from a tank to a nozzle which is adapted to be held against a surface of a porous material for deep penetration of the surface by the liquid. An air stream is provided by a blower and aspirates the liquid from the tank. A fan is positioned in the path of the air stream which flows through an apertured plate. The rotation of the fan caused by the flowing air stream results in the blades of the fan covering and uncovering, in succession, the apertures of the plate, thereby resulting in a pulsating delivery of the liquid-air mixture to the surface of the porous material for deep penetration thereof by the liquid.