RU2444488C1 - Silicate mixture - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: invention relates to construction materials and can be used to prepare mortars and for internal and external plastering. The silicate mixture contains the following in wt %: quicklime 16.8-19.8, non-ground quartz sand 52.6-57.1 and aqueous ammonium nitrate solution with concentration of 0.66-6.25% 23.1-30.6.

EFFECT: high biological stability of the silicate mixture.

2 tbl

Description

The invention relates to building materials and can be used for the preparation of mortars, the production of internal and external plastering.

Known silicate mixture, including non-ground quartz sand, calcareous binder containing quicklime and an additive in the form of an aqueous solution of copper sulfate (RU 2305666, IPC C04B 2/06, publ. 09/10/2007).

The known composition delays the hydration of lime, and in the preparation of a binder prevents the buildup of lime on the walls of the mill, but has a reduced biostability.

The technical result is to increase the biological stability of the silicate mixture.

The essence of the invention lies in the fact that the silicate mixture, including quicklime, ground quartz sand and the additive, contains as an additive an aqueous solution of ammonium nitrate with a concentration of 0.66-6.25%, in the following ratio, wt.%: Quicklime 16 , 8-19.8, non-ground quartz sand 52.6-57.1 and an aqueous solution of ammonium nitrate, concentration 0.66-6.25% - 23.1-30.6.

As the studies show, at a higher concentration of ammonium nitrate in water (more than 6.25%), a decrease in the strength of the silicate mixture is observed, and at a lower concentration (less than 0.66%), the silicate mixture is susceptible to biocorrosion.

The silicate mixture is prepared as follows. Produce a weight dosage of the components. The mixture is obtained by mixing non-ground quartz sand and quicklime. Next, the resulting dry mixture is mixed with an aqueous solution of ammonium nitrate concentration of 0.66-6.25%. The resulting mixture is placed in steel molds and compacted on vibroinstallations.

In the study of silicate mixtures, tests were carried out on samples of the following compositions (table 1)

Table 1 Composition number The composition of the binder The concentration of ammonium nitrate in water,% The concentration of sulphate in water,% Quicklime Ground Quartz Sand Ammonium nitrate aqueous solution Water solution of copper sulfate one 16.8 52.6 30.6 0 2 17.4 53.5 29.1 0.66 3 18.0 54,4 27.6 1,64 four 18.6 55.3 26.1 3.22 5 19.2 56.2 24.6 4.76 6 19.8 57.1 23.1 6.25 7 7.9 80.5 - 11.6 - 5

Tests for biostability are carried out according to GOST 9.049-91 by methods 1 and 3. The following types of mold fungi are used as test organisms: Aspergillus niger, A.flafus, A.terreus, Penicillium cuclopium, P.funiculosum, P.chrysogenum, Paecilomyces varioti, Chaetomium globosum, Trichoderma viride.

The results are shown in table.2.

table 2 Structure The degree of growth of mushrooms, points Characteristic according to GOST 9049-91 Method 1 Method 3 one 3 four Non-mushroom resistant 2 2 four Mushroom resistant 3 one four Mushroom resistant four 0 four Mushroom resistant 5 0 four Mushroom resistant 6 0 four Mushroom resistant 7 3 four Non-mushroom resistant

From the results given in table 2 it follows that the compositions, depending on the ratios of the components have different indicators of biostability. Optimum are compositions 3-6.

The proposed compositions of the silicate mixture in comparison with the known solutions have high mushroom-resistant properties.

Claims (1)

Silicate mixture, including quicklime, non-ground quartz sand and an additive, characterized in that the additive contains an aqueous solution of ammonium nitrate with a concentration of 0.66-6.25% in the following ratio of components, wt.%:
Quicklime 16.8-19.8 Ground Quartz Sand 52.6-57.1 An aqueous solution of ammonium nitrate concentration of 0.66-6.25% 23.1-30.6