For renovating an open-pored plaster layer, a paint is made available that includes water, an inorganic binder on an alkali polysilicate base, a pigment composed of particles and a stabilizer. The stabilizer is composed of small particles on a silicate base, having an average diameter below 3 m, wherein these particles are colloidal distributed in water because of their charge distribution. As a result, the stabilizer prevents an insoluble sedimenting of the pigment particles. Following the application of this paint, the desired and in particular the original color shade is again uniformly present across the complete surface, and the cohesive pores extending through the plaster layer are essentially still open. The sound-absorbing effect of the porous plaster layer is therefore not substantially impaired as a result of the renovation.

The present invention relates to a basalt fiber reinforced asphalt concrete, which includes: an asphalt material with a penetration grade between 40-300 at room temperature, selected from one of an asphalt mortar, an oil-soluble asphalt, an emulsified asphalt, and a modified asphalt; an aggregate having a first volume percentage between 50-80%; a basalt fiber reinforcement with a second volume percentage between 0.1-0.9%; and a chemical admixture for asphalt concrete used to adjust the properties of the basalt fiber reinforced asphalt concrete.

A porous body including an inorganic fiber and an organic binder, wherein the average fiber diameter of the inorganic fiber is 2.0 m or less, the amount of the inorganic fiber is 90% by mass or more, the amount of the organic binder is 0.5% by mass or more and 10% by mass or less, the organic binder contains an elastomer, and the bulk density of the porous body is 30 kg/m.sup.3 or less.

A porous body including an inorganic fiber and an organic binder, wherein the average fiber diameter of the inorganic fiber is 2.0 m or less, the amount of the inorganic fiber is 90% by mass or more, the amount of the organic binder is 0.5% by mass or more and 10% by mass or less, the organic binder contains an elastomer, and the bulk density of the porous body is 30 kg/m.sup.3 or less.