CS200085B1 - Cementary composition - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cementitious β hydroinsulating composition comprising a hydraulic binder modified with processing aids and physico-chemical properties, and hydroaluminosilicates or hydroferoaluminosilicates and / or alkali metal aluminates.

The hitherto known waterproofing cement composites contain special cements which are prepared from selected raw materials. The production of these cements is very difficult, demanding on technological production processes and on the quality parameters of raw materials. Other cementitious insulating materials are applied in several layers of different compositions, some of which contain hydrophobic additives, other sealants and usually a 6 to 7-fold layer is sealed with impregnating and impregnating agents. The disadvantage of these methods is high labor intensity, limited use and insulating properties depend on variable quality factors of individual layers. Therefore, this method is rarely used for the rehabilitation of damp concrete masonry (U.S. Pat.

136570). The mixture of sand, cement, water glass and crystalline sodium carbonate (US Patent No. 79802) has a temporary insulating effect and is not suitable for pressurized water. According to other procedures, an insulating effect is achieved by deep injection, for example, with waterglass or organosilicon compounds, into pre-drilled holes (Patent Nos. 145778, 147414, 124777). This method is of limited use since it requires drilling a series of injection holes, thereby reducing mechanical strength and stability of the work. The method is suitable for some

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200 089 types of rehabilitation of wet concrete work. The use of fine fillers of precise granulometric composition and hydrophobic dispersions of macromolecular substances (Austrian patent 316 405, Swiss patent 572007) requires the production of special bee dispersions and the production of insulation protection in several layers.

Some newer cementitious compositions for waterproofing use colloidal mortars (Moldenhauer.Ht D _and Plastikol-Isoliersystem. Das. Augv.erbe, 55, 1975,9, p. 41, 43), Thoro, Hei di, Dry-Mix systems, etc. In some cases, dry substrates are impregnated (Impragnierung von Fussboden, Arbeiteblatt des BEB, Bodenfandand-Decke, 23, 1977, 1, pp. 36-37). Said processes require special types of cements and difficult modification of modified additives.

These drawbacks are overcome by the cementitious composition of the invention, which is based on exploiting the reactive properties of hydroaluminosilicate or hydroferoaluminosilicate clay minerals of the montmorillonite group and / or alkali metal aluminates.

Said compounds react with free alkaline earth ions, especially calcium, and the resulting colloidal mixture perfectly fills the internal structure of the cement composition and thereby seals it. Primary colloidal additives seal the structure of cementitious compositions reversibly, especially under the influence of moisture. In this case the swelling and the volume of the colloidal components increase. After drying, the colloidal components reversibly return to the original atava. Saturated volume changes of colloidal components adversely affect mechanical strength by disturbing the crystallographic structure of cement minerals. When using the minerals according to the invention, the structure of the whole composition is perfectly tight and there is no volume change even in the case of prolonged exposure to water, moisture or aggressive substances.

Example 1

40.0% white Portland cement PC 325, 38.0% micronized limestone with a grain size of 0.0 to 0.5 mm, 2.0% pigment, 0.1% calcium lignosulfonate, 2.6% carbonic dlamide,

2.5% acid casein, 0.1% ground carboxymethylcellulose, 4.7% calcium stearate, and 10.0% sodium aluminate, all in percent by weight perfectly homogenized. The mixture thus prepared is stored in dry and moisture-protected containers. 100 wt. parts of this mixture and processed with 30 wt. parts of water containing 10 wt. parts by weight of a water dispersion of polyvinyl acetate having a particle size of 0.1 to 0.3 microns and a dry matter content of 50% by weight; The resulting semi-liquid mixture is applied to concrete substrates and creates a smooth, seamless, tough and dust-free surface with good water resistance and mechanical stress. The mixture solidifies within 6 to 8 hours at 20 ° C and creates a walkable insulation return with good aesthetic effect. Example 2% of slag-portland cement SPC 250, 55.0% of inorganic grit with a grain size of 0.1-2.0 mm, 0.1 of dried sulphite liquor, 1.0% of disulfide acid, 2.4% of calcium stearate, 2.5 % of ground hydroferoaluminosilicate and 4.0% of potassium aluminate, all by weight, are perfectly homogenized. 100 wt. 25 parts by weight of water containing 7.0 parts by weight of an aqueous dispersion of a butyl acrylate-methyl methacrylate copolymer having a dry weight of 40% by weight of the mixture are treated with 25.0 parts by weight of water. The mixture is used to compensate for uneven concrete

200 005 structures in thickness up to 1 cm. After setting, my applied material has a dust-free, tough and smooth surface with waterproofing properties and good mechanical properties.

Example 3

30.0% Portland cement PC 250, 60.0% mineral impregnated ^U grain, 1 to 4.0 mm, 0.1 partially decarbonated and demethoxylated sodium potassium lime sulphonate, 0.9% carbonic acid diamide, 2.0% stearin and 7.0% potassium aluminum nitrate, boiling in weight percent, and perfectly homogenized. 100 wt. parts of this mixture are mixed with 16.0 wt. parts of water containing 4.0 wt. % by weight of an aqueous dispersion of a polyvinyl acetate-butyl acrylate copolymer of 45.0 wt. and an acrylic keaonomor content of 20 wt. based on the copolymer. After mixing, the mixture is used for leveling structures of any thickness. The mixture is easy to spray, solidifies quickly to form a solid, dust-free and waterproof surface.

Example 4

48.0% Portland PC 400 cement, 45.0% silica crumb with a grain size of 0.05-0.5 mm, 0.1 µl of partially decarbonated and demethoxylated sodium calcium lime sulphonate, 1.4% carbonic diamide, 2.5 % of zinc stearate, 2.0% montaorillonite activated hydroaluminoallicate mineral 8% wt. sodium carbonate and 1.0% asbestos fibers, suspended in mass prooenteoh, are perfectly homogenized and stored in a moisture-proof container. 100 wt. parts of this mixture are mixed with 28.0 wt. parts of water containing 9.0 wt. parts of the aqueous dispersion of styrene-2-ethylhexyl acrylate-acrylic acid terpolyyer with a dry matter content of 50% by weight, the individual comomozers being in a molar ratio of 55 and 43: 2. 1 horizontal construction konstrukoe. * on hardening, this mixture creates a waterproofing gates that resist the effects of water, pressurized water and aggressive substances. The mixture hardens quickly to form a smooth, beaceless and dust-free surface with good mechanical properties.

The cone composition according to the invention can be used as a scouring smoothing compound for concrete nobo cement legings, which creates a wear layer and fulfills the function of the flooring. The composition can conveniently be used for leveling uneven substrates up to 1 cm in thickness with finer fillers, or when using grain size fillers at any thickness. The waterproofing cementitious composition forms an insulating layer that replaces traditional asphalt and tar insulations, eliminates the need for protective lining and can also be applied to damp substrates. Insulation can be carried out in this way from the outside and inside of the building by a simple application technique such as, for example, by spatula, brush or plastering.

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OBJECT OF THE INVENTION2U

Claims (3)

OBJECT OF THE INVENTION2U Modified cementitious composition by β hydro-insulating effects consisting of hydraulic binders, fillers or auxiliaries such as solidification and curing regulators binders, aerators, plasticizers, retention and processing additives, hydrophobic additives, pigments and fibrous fillers, characterized in that: The composition of claim 1, wherein the composition comprises hydroaluminosilicate or hydroferoaluminosilicate clay minerals of the montmorillonite group in an amount of 1.0 to 8.0 wt. and / or alkali metal aluminates in an amount of 2.0 to 30 wt. based on the hydraulic binder content. Modified cementitious composition according to claim 1, characterized in that it contains pyrophyllite (Al ₂ O ₄ SiOg. 2H,> 0) or beidellite (AlgO 3 SiOg.HgO. NHgO) or montronite ((FeAl) ₂ Qy 4 SiOg). Or montmorillonite (AlgO4. ASiOg. HgO.nHgO), or soils containing said clay minerals in an amount above 60% by weight. %, based on the soil, or said alkali metal-activated compounds, wherein the alkali metal salt content of the hydrohalininosilicates or hydroferoaluminosilicates is 2.0 to 20.0% by weight. Cement composition according to Claims 1 and 2, characterized in that it comprises alkali metal aluminates, preferably sodium aluminate or potassium aluminate. Printed by Moravian Printing Works, plant 12, Leninova 15, Olomouc Price: 2,40 KCs