SU688467A1 - Binder - Google Patents

Description

one

The invention relates to the field of building materials, namely to the composition of mineral in the burning substances, and can be used for the preparation of concrete products with increased strength B and the initial periods of hardening.

It is known to be based on granulated slag with the addition of hemihydrate gypsum, portland cement or lime.

The disadvantage of this is a binder, which is a kind of slag cement, slow hardening due to slow hydration of the main component of the binder - slag.

Of the known most closely to the invention by the technical essence and the achieved effect of gypsum slag in the living, including, weight. %

Semi-aquatic gypsum75-60

Granulated slag 20-27 Portland cement3-8

Activator - soluble silicate nat2-5

ri

However, the known grit has a reduced strength in the initial periods of hardening due to the insufficient ability of the additive to activate the slag hydration in the initial periods.

The purpose of the invention is to increase the initial strength.

This is achieved by the fact that the proposed, including semi-aquatic gypsum, granulated slag, Portland cement and activator, contains silica gel as an activator in the following ratio of components, wt. %:

Semi-aquatic gypsum 65-75

Granulated slag 20.5-27.5 Portlandcement3-5

Silpkagel1,5-2,5

An increase in the strength of the binder at the initial time is achieved by the fact that highly active silica gel reacts with calcium hydroxide and, moreover, the alkaline component Na2O is absent; reduces the solubility of Cao.

Example. To obtain a mixed gypsum slag, 3 mixtures are prepared.

The compositions proposed in the live are given in table. one.

 the mixture is stirred and molded separately from the waters idle at a ratio of 0.5. Samples are stored in water for 4 years.

Table 1

The compressive strength is determined on a hydraulic press.

Physico-mechanical properties of the samples are given in table. 2

As can be seen, the compressive strength in zhKomponenty, weight. %

In the initial periods of hardening, it is 30% higher than the strength of a similar composition with the addition of soluble sodium silicate.

The economic effect of using the proposed tenant is that after 1.5-3 hours, the strength is 25-30% brand, which makes it possible to use the tar as cast mixtures.

for erection of fire installations in coal mines and quick commissioning, which is necessary for the safety of people working in the mine. In the manufacture of building products

the speed of setting and hardening of the substance makes it possible to refuse the heat treatment of products, to increase the turnover of the molds. In addition, waste is recycled - metallurgical

slag.

table 2

Compressive strength through, kgf / cm

Claims (1)

Invention Formula A slurry comprising semi-aquatic gypsum, granulated slag, portland cement and an activator, characterized in that, in order to increase the initial strength. IT as an activator contains silica gel in the following ratio of components, weight. %: Semi-aquatic gypsum 65-75 Granulated slag 20.5-27.5 Portlandcement3-5 Silica gel 1,5-2,5