SU389056A1 - METHOD OF OBTAINING ARMOCEMENT CONSTRUCTION - Google Patents

Description

one

The invention can be used for the manufacture of building materials based on cement reinforced with fibrous materials.

A known method for producing cement-reinforced building materials in which the fibrous component is dispersed in a EXCELLENT medium, introduces an additive, improves the filtration characteristics of the material, then disperses the fibrous component with an additive in an aqueous medium containing cement, after which the wet layer containing the fibers and cement are dispersed out of suspension. However, with this method, a preliminary drying is required to obtain an air suspension of the fibrous material, as well as complex dedusting equipment, which leads to a high cost of the method.

The purpose of the invention is to increase the water separation of the cement mass, as well as its density and durability.

This is achieved in that part of the additive is introduced at the cement grinding stage, and the remainder at the fiber dispersion stage.

The additive at the cement grinding stage is 20 wt. % of the total amount, and the rest of the additive is introduced (When the fibrous component is dispersed in a wet

environment. The total content of the additive is 0.5-25% by weight of cement.

An aqueous solution of sodium, potassium silicate or their mixture is used as an additive.

Portland cement, slagshurtland cement or czTsolan Portland cement can be used as cement.

Cellulose fiber treated with barium sulphate or strontium sulphate, asbestos or glass fiber, as well as a mixture of the said fibers, into which iron filings, sponge iron, synthetic hydrosilicates, calcium hydroaluminates or calcium hydroaluminates can be additionally added, are used as the fiber component. All these materials can also be used separately.

The beneficial effect of the additive is to improve the filtration properties of the cement cement.

Example. Armo-cement mass of Portland cement, containing an additive of 0.5 wt.% Sodium liquid glass in the form of aqueous pacTiBOpa with a specific weight of 1.35 g / cm, asbestos with the addition of different amounts of the same solution and water, in the ratio of cement: asbestos: water and 0 , 15: 0,85: 3, dehydrated on the filter with a vacuum of 130 mm Hg. Art. (The results are shown in the table.

The table shows that the filtration properties of the cement-reinforced material are dramatically improved with an additive content of more than 6–8% by weight of cement, a further improvement in the filtration characteristics of the cement-reinforced layer is not observed, but as a result of the interaction of the additive with fibers and the release of silica hydrogel compacted ( the additive begins to exhibit its own binding properties.

The advantage of this method is its simplicity. The additive, when grinding cement B1, is introduced through the feeders by dosing to the clinker, and in the mill, by injection through existing plants for the introduction of water. When asbestos is disentangled, the rest of the additive is introduced on the runners, and when using other fibers, it is introduced into the suspension medium by iB.

Subject invention

A method for producing cement-reinforced building materials by dispersing the fiber component first in a wet and then in an aqueous medium, supplying cement to the latter and adding an additive of finely divided water alkali metal silicate, characterized in that, in order to increase the water separation of the cement mass, as well as its density and durability , part of the additive is introduced at the cement grinding stage, and the rest at the stage of dispersion of the fibrous component.