Abstract: Polymers for cement dispersing admixtures, which show different performing properties in concrete are described.

Abstract: A multipurpose cement dispersing, shrinkage compensating and anticorrosive polymer and an admixture comprising said polymer, which improve the workability and the early strength development of fresh concrete, are described.

Abstract: An injection cement on the basis of micro cement is described that comprises corrosion inhibitors, preferably salt-like products of the neutralisation of amines with acids. Said cement is in particular suitable for the restoration and improvement of the corrosion resistance of buildings comprising fine cracks and cavities laying far below the surface.

Abstract: Cement dispersing agents for self-compacting concrete of high flowability, comprising a water-soluble N-vinyl copolymer, prepared by copolymerizing (a) an N-vinyl-lactame or -amide with (b) a polyethylene glycol ester of maleic acid containing 6 to 240 moles of oxyethylene groups per molecule and (c) at least one monomer selected from among unsaturated dicarboxylic acids and (d) methallylsulfonic acid. When an aqueous solution of this copolymer is used as an admixture to freshly prepared concrete of even extremely low water-to-cement ratio, a high fluidity, a low decrease in flowability with the progression of time and a lack of segregation over time is attained.

Abstract: Additives are disclosed which inhibit the corrosion of metals in construction materials which contain an inorganic binder. The inventive corrosion inhibitors contain a reaction product of amines and acids or they consist of such a reaction product. Said saltlike corrosion inhibitors upon use do not develop any undesired fragrance, and they furthermore do not bring along any health risks for the persons who are working with said substances. Through the adding of the inventive corrosion inhibitors, furthermore the properties of the construction material during its preparation and also during its use can be improved. In corresponding processes for inhibiting the corrosion of metals which are in contact with the construction materials, like e.g. metal armings, the corrosion inhibitors are usually added in an amount of 0.01% by weight to 10% by weight of said reaction product, referred to the inorganic binder which is contained in such material.

Abstract: There is described a thixotroping and set accelerating additive for mixtures which contain as component a hydraulic binder and/or a latent-hydraulic binder and furthermore water and optionally also an aggregate and/or other additives. The inventive thixotroping and set accelerating additive consists of one or more esters of the carbonic acid or said additive is a mixture which has a pH-value of not more than 8.0, preferably not more than 7.5 and contains as component at least one of said carbonic acid esters.Optionally the inventive additives can comprise further components which frequently are added to materials containing a hydraulic binder in order to improve the workability and/or the properties of the final building material, like concrete plasticizers, concrete super-plasticizers, set retarding agents, set accelerating agents, air entraining agents and optionally further thixotroping agents and mixtures of two or more such additives.

Abstract: Admixtures for spray concrete or mortar which contain silicic acid sol or consist of it, are used for the processing of spray concrete or mortar according to the dry or the wet method. Said admixtures lead to a clear reduction of dust formation and of rebound. With the processing of spray concrete or mortar the addition of the inventive admixtures takes place preferably during the spraying, for example at the spray nozzle.

Abstract: Disclosed is a highly reactive hydraulic binder for the preparation of building, construction and raw materials which contains burned oil shale and at least one compound, selected from the group, consisting ofan amorphous oxide of 3- and/or 4-valent cations,an amorphous hydroxide of 3- and/or 4-valent cations, andan aluminate of 1- and/or 2-valent cations, as well asat least one water reducing agent.

Abstract: Novel water-soluble linear copolymers of N-vinylamides with monomeric addition products of amines, amino acids, amino groups containing aromatic sulfonic acids, amino alcohols of maleic anhydride as well as maleic esters of polyoxyalkyleneglycols or their monoethers. There is also described the process for the preparation of these copolymers. The copolymers are useful as fluidizers in water containing solid matter suspensions.

Abstract: For the preparation of a building and/or construction material a polymer modified, aqueous dispersion, containing amorphous silicon dioxide and at least one polymer, is mixed and reacted with at least one inorganic binder, and occasionally with at least one aggregate, and hardens thereby.The polymer modified, aqueous dispersion contains amorphous silicon dioxide and at least one polymer.This polymer modified, aqueous dispersion is used for the preparation of a building and/or construction material.

Abstract: For the acceleration of the setting and of the hardening of a hydraulic binding agent such as cement, limestone, hydraulic limestone and gypsum as well as mortar and concrete prepared thereof, are added to the mixture, which contains said binding agent, from 0.5 to 10 percent by weight, referred to the weight of this binding agent, of an alkali-free setting- and hardening-accelerator, whereby this accelerator contains aluminum hydroxide.

Abstract: Highly concentrated aqueous solutions of low viscosity of melamine/aldehyde resins are obtained by reacting to a precondensate in a first step melamine and an aldehyde in an alkaline medium and in the presence of water together with at least one compound (I), selected from the group, consisting of an alkali sulfite, an alkaline earth sulfite, an amino sulfonic acid, an amino carboxylic acid, a hydroxycarboxylic acid, a hydroxycarboxylic acid lactone, and a polyhydroxy carboxylic acid lactone, reacting then the thus obtained mixture in a second step with at least one compound (II), selected from the group, consisting of an amino carboxylic acid, a carboxylic acid, a hydroxy carboxylic acid, a hydroxy carboxylic acid lactone, a sulfamic acid, an amino sulfonic acid, a polyhydroxy carboxylic acid and a polyhydroxy carboxylic acid lactone, and then making alkaline the obtained resin solution by adding at least one basic compound (III).

Abstract: The invention provides a polycondensation product of(a) sulfamic acid (H.sub.2 N--SO.sub.3 H) and/or at least one N-substituted organic derivative of the sulfamic acid as such or in the form of their salts,(b) formaldehyde and/or glyoxal(c) melamine and/or at least one phenolic compound.This polycondensation product may be used as at least one component in a material for construction.

Abstract: According to this method of corrosion protection a coating comprising an aqueous suspension of 10-99.99% of hydraulic binding agents, preferably cement or mixtures thereof with latent hydraulic additives, and 0.01-10% corrosion inhibitors is applied onto the metallic articles intended to be enclosed in structures. The application of these specific protective slurries is advantageous in that they adhere especially well are force-locked, respectively, to the structures of an inorganic material, specifically to concrete and to the metallic articles.

Abstract: Highly concentrated aqueous solutions of low viscosity of melamine/aldehyde resins are obtained by reacting to a precondensate in a first step melamine and an aldehyde in an alkaline medium and in the presence of water together with at least one compound (I), selected from the group, consisting of an alkali sulfite, an alkaline earth sulfite, an amino sulfonic acid, an amino carboxylic acid, a hydroxycarboxylic acid, a hydroxycarboxylic acid lactone, and a polyhydroxy carboxylic acid lactone, reacting then the thus obtained mixture in a second step with at least one compound (II), selected from the group, consisting of an amino carboxylic acid, a carboxylic acid, a hydroxy carboxylic acid, a hydroxy carboxylic acid lactone, a sulfamic acid, an amino sulfonic acid, a polyhydroxy carboxylic acid and a polyhydroxy carboxylic acid lactone, and then making alkaline the obtained resin solution by adding at least one basic compound (III).

Abstract: An additive for mortar and concrete composed of water-soluble, swellable polymeric substances, said water soluble, swellable polymeric substances being employed in a finely dispersed state in an aqueous solution of salt or organic solvents.