SE435050B - SET FOR MANUFACTURING OF HANDLED GAS CONCRETE WITH WATER REFUSING PROPERTIES - Google Patents

Description

7.9 075 72- 'Thus, bodies or objects of steam-cured aerated concrete with homogeneous dyeing are obtained.

Silicone oil consists of liquid products based on polymers of the type R R R “Si * O“ Si _ O “Si - O I I | R R R where R represents methyl, ethyl or phenyl, but usually methyl. Thus, dimethylsiloxane oil is usually used as the silicone oil. Such oils are available with viscosities that can vary over a wide range from 0.65 to 100,000 centistokes and provide a good water-repellent effect in the case of non-hardened aerated concrete, if the amount of additive is adjusted to a suitable value.

The invention is characterized on the basis of the above in that the slurry before casting is added with 0.05 - 5% silicone oil consisting of silicon-oxygen polymers with methyl, ethyl or phenyl groups bonded to the silicon atoms of the polymer, and with 0.5 - 10% alkali resistant color pigments, in both cases based on the weight of the dry slurry.

Examples of color pigments that give a product with a yellow hue are iron oxide yellow, cadmium yellow, ocher and sienna, on color pigments that give a product with red hue hematite, iron oxide red and Venetian red, on color pigments that give a product with a brown hue iron oxide brown, metallic brown and umbra, on color pigments that give a product with a blue color tone cobalt blue and ultramarine, on color pigments that give a product with a green color tone chromium oxide green, chromium oxide hydrate green and permanent green, on color pigments that give a product with a black color bone black, gas black and iron oxide black . The above-mentioned color pigments reportedly have a good ability to withstand the effects of alkaline conditions as well as light and water and can withstand normal vapor curing conditions of about 200 ° C.

It is previously known to color bodies of steam-cured aerated concrete by various methods by surface treatment or plastering of the surface of the body, the latter being able to exist as a facade surface. It is also known to use dry mortars and surface plasters which are coated with color pigments such as inorganic oxide compounds for coating the surface of aerated concrete bodies. In connection with the manufacture of lime sandstone, it is also known to add the raw material for the lime sandstone with color pigments, whereby after steam hardening a body is obtained which is dyed through the entire mass of material.

Attempts have also been made in the past to set the slurry of raw material mixture with color pigments in order to achieve steam-cured aerated concrete bodies with dyed-through material mass. However, it has been found that the colored surface of the bodies is not resistant to various climatic influences. Thus, if a facade surface composed of a surface of such bodies is exposed to rain, the capillary pore system of the aerated concrete product will absorb water, which causes great inconvenience. This reduces the heat-insulating ability of the aerated concrete material. discoloration by migration of soluble salts in the product and deteriorates the frost resistance.

All the inconveniences of the known methods are considerably reduced or eliminated altogether by the present invention.

The invention will be described in the following with some examples. EXAMPLE 1 For the production of steam-hardened aerated concrete, an aqueous casting compound of the following components was prepared: raevsvvz-v 4 sand 50 kg portland cement 28 kg lime 12 kg scrap sludge- 8 kg aluminum powder + regulators 2 kg To the obtained the mixture weighing 100 kg was added 55 l of water.

The slurry, which was used as a casting compound, was added with 2.0% yellow color pigment (iron oxide yellow), based on the weight of the dry starting mixture.

The sand was quartz-containing with a silica content of 70 - 80%. The lime used consisted of finely ground quicklime with a CaO content of 88-92%. The cement was of the normal Portland cement type. The aluminum powder had a thin-flake structure with a content of free aluminum amounting to 90-95%. It was thermally degreased.

The production proceeded as follows. The quartz-containing sand was wet-milled in a ball mill into a comparatively easy-flowing sludge with a high degree of fineness. The sand sludge was then carefully mixed with carefully weighed amounts of cement, lime, scrap sludge and extra water into a mass of suitable consistency. After steam curing in an autoclave for 12 hours at 10 atm, a product was obtained with the following properties: Compressive strength kp / cmz 39.7 Volume weight, kg / m3 470 Salt rash: quite strong.

Water uptake l / m2 after 24 hours 12.9 "48" 16.6 "72" 17.5 The surface of the solid-colored yellow-toned aerated concrete was significantly dark-colored due to the water uptake and discoloured after drying of salt precipitates. The strong water uptake entails increased risks of frost damage.

EXAMPLE 2 In a manner similar to Example 1, an aerated concrete (dyed through 2.0% of the same color pigment as in Example 1) was prepared, adding 1.5% dimethylsiloxane oil having a viscosity of 1000% as an additive to the slurry for casting. centistokes, based on the weight of the dry starting mixture.

The cast and vapor-hardened aerated concrete had the following values: Compressive strength, kp / cmz 38.2 volume weight, kg / m3 470 Salt rash: no Water uptake 1 / m2 'after 24 hours 1.1 II ll 1.4 nn 1.9 The yellow-colored aerated concrete surface was not discolored as the water uptake was significant and there was no salt rash. Furthermore, there was no risk of frost damage as the product's water uptake was low.

EXAMPLE 3 Aerated concrete was manufactured in a similar way as in Example 1, ie. the crude mass was dyed with 2% of the same yellow pigment. To the slurry intended for casting was added 0.3% of the same dimethylsiloxane oil as in Example 2, calculated on the weight of the dry starting mixture.

The autoclaved aerated concrete showed the following test values: íeevsvz-1 Compressive strength, kp / cmz 41.1 Volume weight, kg / m3 '470 Salt rash: none- Water uptake 1 / m2 after 24 hours 1.3 "48" 1.9 "72" 2, 2 The aerated concrete, which was completely colored, had a non-discolored yellowish surface, without a salt rash, and the water uptake was insignificant, which means that there is no risk of frost damage.

A comparison between Examples 2 and 3, which relates to experiments with the method according to the invention, and Example 1, which relates to an experiment according to the prior art, shows that the former two give superior results in terms of color: the durability and material properties of the tone.

EXAMPLE 4 Steam-hardened aerated concrete was manufactured in a similar manner as in Example 1, where the seed was dyed with 2% red color pigment (iron oxide red). To the slurry for casting was added 0.05% methylphenylsiloxane oil having a viscosity of 500 centistokes, based on the weight of the dry starting mixture.

The steam-hardened aerated concrete product showed the following properties: Compressive strength, kp / cm * 39.7 volume weight, kg / m '470 shrinkage, 0/00 undetermined salt rash no Water uptake, lit / m * after 24 hours 4.1 II II 5.6 n II 6,5 7907572-7 The aerated concrete, which was fully colored, showed a non-discolored reddish surface without a salt rash. Water uptake was low compared to a product made without silicone oil, which means that the risk of frost damage is non-existent.

EXAMPLE 5 Steam-hardened aerated concrete was manufactured in a similar manner as in Example 1, in which the solution was stained with 3% red color pigment (iron oxide red). To the slurry for casting was added 0.2% of methylphenylsiloxane oil having a viscosity of 500 centistokes, based on the weight of the dry starting mixture.

The steam-cured aerated concrete product showed the following properties: Compressive strength, kp / cm * 40.1 volume weight, kg / ma 470 shrinkage, 0/00 undetermined salt rash no Water uptake, lit / m 'after 24 hours 1.9 ll Il 2.6 ll | | 3.3 The aerated concrete, which was fully colored, showed a non-discolored reddish surface without a salt rash. Water uptake was insignificant, which means that the risk of frost damage is non-existent.

Claims (1)

1. i9o7s12-1 PATENT REQUIREMENTS In the production of hardened aerated concrete with water-repellent properties, preparing an aqueous expandable and solidifiable slurry of a hydraulic binder and a silicic acid-containing material, the slurry is cast in a mold and after expansion and solidification and possible cutting causes the resulting aerated concrete to harden, characterized in that the slurry before casting is added with 0.05 ~ 5 t of silicone oil consisting of silicon-oxygen polymers with methyl, ethyl or phenyl groups bonded to the silicon atoms of the polymer and with 0.5 - 10% alkali-resistant color pigment, in both cases based on the weight of the dry slurry. 71107572-7 SUMMARY The invention relates to a method of producing steam-cured aerated concrete with water-repellent properties, in which an aqueous expander and solidifiable slurry of one or more hydraulic binders and silicic acid-containing material is prepared, the slurry is cast in a mold and after expansion and solidification and possible cutting cause the resulting aerated concrete to harden. The invention is characterized in that the slurry is pre-cast with silicone oil and with an alkali-resistant paint pigment.