SU1715779A1 - Method of manufacturing products from cellular concrete - Google Patents

Abstract

This invention relates to a technology for the manufacture of building materials, in particular, to methods for preparing cellular concrete. The purpose of the invention is to increase the strength of products. To do this, sand containing 31% unbound silica is ground together with dihydrate gypsum using a wet method, then wet sludge is mixed with water with crushed lime and an aluminum slurry is added to the resulting mixture. The resulting mixture is poured into molds, swell, and then autoclaved the products, the strength of which increases by 15-50%, are carried out. 3 tab.

Description

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The invention relates to the technology of building materials and can be used in the manufacture of cellular concrete.

The purpose of the invention is to increase the strength of the products. The method is as follows.

To prepare cellular concrete, first separate grinding is carried out in lime ball mills, wet grinding of sand containing at least 31% unbound S102, together with two-water gypsum. Then, in the mixer, mix the ground sludge with water with crushed lime and mix for 2 minutes. An aluminum slurry is added to the mixture of sand slurry, gypsum and lime, and mixed for 3 minutes. The prepared concrete mixture is poured into molds and, under the influence of horizontally directed vibration, is expanded. The pre-autoclave exposure is 2-4 hours, after which the heat and humidity treatment is carried out in an autoclave at a pressure of 0.8 MPa.

When jointly grinding quartz, quartz, patron, feldspar-quartz sand with wet gypsum, gypsum, as the softest material, is crushed to a specific surface of 6000-10000 cm2 / g. When grinding, gypsum, feldspath aluminosilicates, and then quartz sand are first crushed.

High dispersion and solubility of gypsum promotes the hydrolytic splitting of feldspathic silica-alumina with the release of SiOa and alkalis; splitting begins when grinding and res. ko increases with autoclave processing.

Thus, in addition to the quartz, when performing this method, 20-30 SiOa is added, which is actively intermixed with vi-h

acts with lime to form high-strength neoplasms.

An example of a specific implementation of the method.

Characteristics of raw materials.

The following raw materials were used to prepare cellular concrete: lime-kettle with an activity of 63%

90% gypsum stone

quartz, quartz-feldspar, polygamite-quartz sand.

Table 1 shows the chemical composition of the sands.

Preparation of raw materials.

Lime-kettle, the last stage of grinding to 0-20 mm, grind in a laboratory mill,

The sand is ground in a laboratory mill together with wet water gypsum to a specific surface of 3000 cm2 / g. The density of the sand slime is 1.7 kg / l ....

Gypsum stone is ground in a laboratory mill to a specific surface. -2000sm2 / g. :.

Preparation of cellular concrete mix. ., - ,, ..;;: - ...

Cellular concrete mixture is mixed in a laboratory mixer capacity: THEN l. The sequence of loading the materials into the mixer: sand slurry + water + lime - mixing for 2 minutes, after which the aluminum suspension is added and the mixture is stirred for 3 minutes.

The temperature of the mixture at discharge from the mixer is 36-39 ° C.

The prepared mixture is poured into molds with a size of 10x10x10 cm and, under the influence of horizontally directed vibrations, are expanded.

The pre-autoclave holding of the samples is 4 hours.

Autoclaving is carried out

by mode:

- pressure rise -Wh. Isobaric extract at 0.8 MPa - 8 h. - Descent - 3 h.

The data for the example are given in table 2 (gr,) in gr. B the data on the prototype are given ..

The method allows to obtain on sands containing not less than 31% unrelated SI02, cellular concrete with high physicomechanical characteristics without the use of cement. At the same time, the consumption of gypsum is reduced by more than 2 times. Table 3 summarizes the strength gains.

The compositions of mixtures are taken from Table 2.

Claims (1)

The invention The method of manufacturing products from cellular concrete, including grinding of lime, wet grinding of sand, mixing water, sand slime with gypsum and lime with the addition of an aluminum suspension with repeated mixing, followed by molding products and autoclaved processing. that, in order to increase the strength of products, sand containing at least 31% unrelated S10 is ground together with dihydrate gypsum by a wet method, followed by mixing the obtained ground sludge with water and crushed from news. table 2 The results of comparative tests of the proposed and known method Table 3 The increase in strength of cellular concrete of the proposed method in comparison with the known 630 320 31 60,8 80 31 60,8 80 143 134 116 158 142 121 150 140 126 164 145 126