Abstract: Method of applying a layer of air-sprayed concrete onto a surface, wherein a pumpable and sprayable mixture of air-sprayable concrete is prepared from cement, aggregates, optional additives, and water. A given mass flow of the mixture of air-spray concrete is sprayed by means of a concrete feed pump through a concrete feed line to a spraying apparatus with a device for the introduction of propelling air under a feed pressure of several bars. The propelling air is charged with synthetic silica exhibiting a BET surface of at least 25 m.sup.2 /g. The synthetic silica is added with the propelling air into the mass flow of the mixture of air-spray concrete in such an amount that the applied air-spray concrete experiences a spontaneous temperature elevation of a few degrees Kelvin immediately after application. A spraying apparatus for the method is also shown.

Abstract: Bituminous binders are disclosed which contain at least one silane and show excellent improvement of adhesion. The bituminous binder containing silane is manufactured by heating The bituminous binder to a temperature of 120.degree.-230.degree. C. and stirring in the silane. All known silanes can be used as the silane. The resulting compositions can be used for the production of street surfacings, industrial floors, floorings, building protective paints, roof coating masses, undercoatings for motor vehicles and rail vehicles, and cable covering compounds.