SU833794A1 - Method of making construction articles - Google Patents

Description

(54) METHOD FOR MAKING CONSTRUCTION PRODUCTS

laid gypsum concrete layer. - Further heat treatment of the product is carried out in air-dry conditions at 105-110 C.

Example. The concrete mixture is prepared on high-aluminate cement with a water-cement ratio of 0.45 and 0.55, placed in a mold and subjected to heat and moisture treatment for 5 hours, 15 minutes and 6 hours and 35 minutes, respectively. At the same time, the value of electrical resistance in the process of heat and moisture treatment is measured.

When the minimum electrical resistance of the concrete is reached (2.0 102 ohms),

those. 55 minutes after laying the concrete mix, and a water-cement ratio of 0.45 and with an electrical resistance of 2.9 10 ohms, i.e. 1 h 20 min after laying for a concrete mix with a water-cement ratio of 0.55, the surface of the concrete is irrigated with 10.30 and 50% solution of magnesium sulphate in the amount of 0.5 a when the maximum electrical resistance is reached, respectively 1.7 (and 2.3 -10 Ohm after the heat-moisture treatment the gypsum-concrete layer is laid and the products are dried. The results are shown in tal.1.

Table 1

to

-minimum resistivity;

it "

-maximum electrical resistance

The advantage of the proposed method is that the irrigation of the surface of concrete prepared on high aluminate cement promotes the transfer of aluminates and hydroaluminates to compounds resistant to the effects of gypsum entering the concrete space during the dissolution of gypsum concrete. The spray time with a minimum of electrical resistance of concrete is chosen based on the fact that at this moment the formation of a capillary-porous begins

structures and improve the conditions of impregnation and interaction of the cement paste with a solution of magnesium sulphate. The laying time of gypsum concrete at the maximum electrical resistance of concrete and drying. The products are chosen in such a way that by this time the hardening processes will fade and a more intense temperature effect may be exerted on the concrete (105-110 s)

The results of physico-mechanical tests are shown in table 2. The proposed method makes it possible to achieve brand strength with uncontrolled elongation deformations. The invention The method of manufacturing building products, including the formation of a structural layer of concrete on high-aluminate cement, its heat and moisture treatment, laying of a concrete layer followed by drying the product, is characterized by the fact that, in order to increase

The strength table of the product during the heat-moisture treatment of the concrete layer measures the electrical resistance and at the minimum value a 10-50% solution of magnesium sulphate is applied to the surface of the concrete layer, and the gypsum-concrete layer is laid-up to maximum and then the product is dried at 105-110 ° C . Sources. Information taken into account in the examination 1. Japan Patent 51-28651, cl. B 28 B 11/08, 1976. 2, CGCP Copyright Certificate No. 160454, cl. From 04 To 27/04, 1961.

Claims (2)

Claim A method of manufacturing building products, including forming a structural layer of concrete on high aluminate cement, heat and moisture treatment, laying a gypsum concrete layer with subsequent drying of the product, characterized in that, in order to increase the strength of the product during heat and moisture treatment of the concrete layer 20, they measure its electrical resistance and with a minimum value applied to the surface of the concrete layer. A 10-50% solution of magnesium sulfate, and at the maximum - a gypsum concrete layer is laid jc, after which the products are dried at 105-110 ° C. Sources of information taken into account during the examination 1. Japanese Patent No. 51-28651, 30 cl. B 28 B 11/08, 1976. 2. Copyright certificate of the USSR No. 160454, cl. From 04 to 27/04, 1961.