SU1013432A1 - Method for preparing building composition - Google Patents

Description

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The invention relates to methods for the preparation of building compositions and may find application in the construction of floor consoles. There is a method of preparing a building composition, which includes mixing gypsum in a mortar with Cl J. additives. The closest to the technical, essence and the achieved result is a method of preparing a construction composition, which includes mixing, 0-hemihydrate calcium sulphate of portland cement, pozzolanic additive with sodium salt sulfonated naphthalene formaldehyde resin sulphite yeast mash and water G2. Known method does not provide a high viability of the composition. The aim of the invention is to increase the viability. The goal is achieved by the fact that according to the method of preparation of the building composition, predominantly of the tie, by mixing the p6 sulfate hemihydrate with the calcium salt of sulfated naphthalene formaldehyde resin and water, the dL-calcium sulfate hydrate is pre-grinded with 0.1-0.15 Becvl sodium tripolyphosphate. 5 The building composition contains calcium sulfate hemihydrate obtained by grinding, raw materials as a binder, mixing it with 0.31 wt.% Lime, wetting the solution of maleic anhydride with a consumption of 0.09-0.16 wt.% Maleic anhydride, briquetting, heat treating with steam under pressure and soy. The composition of the tie is prepared as follows. The dispersant is dissolved in the sodium salt of sulfonated .. naphthalene formaldehyde resin in water, then d-calcium sulfate hemihydrate previously ground with sodium tripolyphosphate is added to the resulting solution. The viability of the composition is determined by measuring at certain time intervals (after 15–20 min) the spreadability of the Suttard. For a measure of the viability of the time after mixing the components, during which the composition of the joint acquires Suttard spreadability equal to 200 mm. As a rule, the strand ceases to self-level its surface upon reaching a flowability of less than 200 mm, while the droplets of the composition that feed from the Suttard's cylinder do not disappear on the straightening. The change in the strength of the samples is fixed after 1.7 and 28 days after preparation of the composition. Examples of the proposed compositions of the building composition are presented in table. 1. In example 1 and 3, ct -cap calcium sulfate hydrate is milled, 15 wt.% Sodium tripolyphosphate, in example 2 — with O, 1%. The tightening properties are presented in table. 2. From table. 2, it follows that the proposed method allows to obtain building compositions with increased viability. The use of the proposed construction composition will make it possible to create high-strength self-leveling fasteners to speed up the production of works on the creation of floor structures of industrial and civil buildings. Table 1 .

ci- Calcium Sulphate Hemihydrate

Sodium salt of sulfonated naphthalene formaldehyde resin

Water

100

100

0.2 35

1 25

Spreadability after 3 min after mixing the components ,, mm

Viability, min

Strength at compression, mkg / cm

after 1 day after 7 days after 28 days

The beginning of the seizure of Vic, min

Table 2

187 270 251 120 after 2 minutes 150 150 150 54-59

187

328 331

345

256

200

200 200

Claims (1)

COOKING METHOD. CONSTRUCTION COMPOSITION, mainly screeds, by mixing the calcium sulfate hemihydrate cL-hemihydrate with sodium sulfonated naphthalene formaldehyde resin and water, characterized in that, in order to increase viability, calcium calcium sulfate <-hemihydrate is preliminarily ground from 0.1-0.15 weight. % sodium tripolyphosphate. >