RU2610465C1 - Finishing composition - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: invention relates to construction materials, specifically plaster mixtures, intended for finishing external and internal sides of walls of building structures. Finishing composition, including air-slaked lime, mineral filler, water, plasticising, mineral, waterproofing and polymer additives, contains as mineral additive synthetic calcium hydrosilicates, obtained by precipitation in presence of 10 % CaCl₂ solution in an amount of 50 % of weight of liquid sodium glass with silica modulus 2.8 with addition of diatomite with ratio of liquid to solid phase (L:S) equal to 1:2, with subsequent milling of dried additive at a temperature of 100–110 °C for 24 hours to specific surface area of additive 1,900 m²/kg, as plasticising additive-Kratasol-PFM, polymer additive – Neolith P-4400, waterproofing agent – Zincum-5, as mineral filler – quartz sand from Ukhtin deposit with fractions 0.630–0.315 and 0.315–0.14 at following ratio of 80:20 respectively with following ratio of components, wt%:

air-slaked lime 16.318–21.78, quartz sand, fractions: 0.630–0.315, 40.63–44.45, 0.315–0.140, 10.16–11.112, Neolith additive P-4400 0.04–0.06, additive Zincum-5 0.08–0.095, plasticiser Kratasol-PFM 0.17–0.20, synthetic calcium hydrosilicates 4.91–6.47, water 20.67–22.855.

EFFECT: technical result is high compression strength and low coefficient of water absorption during capillary suction.

1 cl, 8 tbl

Description

The invention relates to the field of building materials, namely to stucco mixtures intended for finishing the external and internal sides of walls of building structures.

Known compositions containing lime fluff, filler, water. The filler was obtained by precipitation from liquid glass with the addition of a precipitating agent and chromoform (copper sulfate CuSO ₄ and iron chloride FeCl ₃ ) [1].

The closest in technical essence and the achieved result is a composition including fluffy lime, filler, water, plasticizing, mineral and hydrophobizing additives [2].

The disadvantage of these compositions are low tensile strength in compression and a high coefficient of water absorption during capillary absorption.

The objective of the invention is to remedy these disadvantages.

The problem is solved in that the composition, including fluffy lime, mineral aggregate, plasticizing, mineral, hydrophobizing and polymer additives, water, contains synthetic calcium hydrosilicates synthesized in the presence of diatomite as a mineral additive, and Neolith P- redispersible powder as a polymer additive 4400, as a plasticizing additive Kratasol-PFM, as a hydrophobizing additive Zincum-5, and as a mineral aggregate, quartz sand of the Ukhta deposit with fra shares 0.630-0.315 and 0.315-0.14 with a ratio of 80:20, respectively, with the following ratio of components, mass. %:

Lime Fluff 16,318-21,78 Quartz sand, fractions: 0.630-0.315 40.63-44.45 0.315-0.140 10.16-11.112 Additive Neolith P-4400 0.04-0.06 Zincum-5 supplement 0.08-0.095 Plasticizer Kratasol-PFM 0.17-0.20 Synthetic Calcium Hydrosilicates 4.91-6.47 Water 20.67-22.855

The finishing mixture is prepared in the form of a homogeneous mixture consisting of lime-fluff, sand of quartz fractions 0.630-0.315: 0.315-0.14 in a 4: 1 ratio, additives in the form of synthetic calcium hydrosilicates, Kratasol-PFM, Neolith P-4400 and Zincum- 5, which before use is diluted with water to the state of an easily moving plastic paste.

To prepare the composition used the following materials:

- slaked lime (fluff) with an activity of 86%, true density ρ _source = 2200 kg / m ³ and bulk density ρ _us = 280 kg / m ³ ;

- The sand of the Ukhta deposit belongs to the group of fine sands. The mineral composition is quartz with an admixture of feldspar, glauconite, clay-opal aggregates, as well as fractions of heavy minerals - zircon, rutile, ilmenite, distene, etc. Physicochemical parameters are shown in table 1.

- water from a domestic drinking water supply that meets the requirements of GOST 23732-79 [3];

- Kratasol-PFM admixture is a multifunctional admixture for concrete, meets the requirements of GOST 24211 [4] and belongs to the group of superplasticizers and additives that increase frost resistance.

Kratasol-PFM is obtained by multistage organic synthesis; it is a copolymer based on sodium polymethylene naphthalenesulfonates with the addition of an air-entraining and hydrophobizing component. The main indicators of the additive Kratasol-PFM are shown in table 2.

- Neolith P-4400 additive is a redispersible powder based on vinyl acetate and vinyl versatate. It is produced by spray drying a latex dispersion with polyvinyl alcohol as a protective colloid. Delivered to Russia by EuroChem-1. The main indicators of the additive Neolith P-4400 are shown in table 3.

- Zincum-5 additive is a hydrophobizing powder based on zinc stearate (TU 6-09-17-316-96). Supplied by Reahim JSC, meets the requirements of GOST 24211 [4]. The main indicators of Zincum-5 additives are shown in table 4.

A mineral additive is obtained by precipitation in the presence of a 10% solution of CaCl ₂ (meets the requirements of GOST 450-70) [5] in an amount of 50% by weight of liquid sodium glass with a silicate module of 2.8 with the addition of diatomite, the ratio of liquid: solid phase (W: T) is (W: T) = 1: 2, followed by grinding the dried additive at a temperature of t = 100-110 ° C for 24 hours to the specific surface area S _{bead of the} additive = 1900 m ² / kg.

Physico-chemical characteristics of the mineral additives based on synthetic hydrosilicates are presented in table 5.

Specific examples of the composition of the finishing mixture are given in table. 6.

Lime Fluff 16,318-21,78 Quartz sand, fractions: 0.630-0.315 40.63-44.45 0.315-0.140 10.16-11.112 Additive Neolith P-4400 0.04-0.06 Zincum-5 supplement 0.08-0.095 Plasticizer Kratasol-PFM 0.17-0.20 Synthetic Calcium Hydrosilicates 4.91-6.47 Water 20.67-22.855

The following methods were used to study the properties of the presented compositions.

The compressive strength of the samples was determined according to GOST 5802-86 “Construction solutions. Test methods ”[6] on cube samples measuring 70 × 70 × 70 mm at the age of 28 days. Three samples were made. As a test equipment for studying the compressive strength of samples, a testing machine of the type IR 5057-50 was used. Depending on the type of used IR 5057-50 power sensor, the range of force measurement is from 50 to 50,000 N with an accuracy of 1 N (0.1 kgf). The built-in controllers of the traverse movement speed allow setting the load application speed from 1 to 100 mm / min (by the value of movement). The compressive strength of the samples is determined by the formula:

where P is the destructive force, N;

F is the cross-sectional area of the sample before the test, mm ² .

Drying time was determined in accordance with GOST 19007-73 [7]. Assessment of the degree of drying was carried out on a seven-point scale. The method is based on the ability of coatings, depending on the degree of cure, to hold glass balls or paper on their surface at a given load and consists in determining the time during which the finishing layer turns into a layer with the desired degree of drying (table 7).

For testing, beam samples 40 × 40 × 160 mm in size were made according to GOST 30744. The number of samples was 3.

Water absorption during capillary suction was determined according to GOST 31356-2007 [8]. Forms are required for the manufacture of beam samples 40 × 40 × 160 mm in size. After 28 days, the end faces of the beam samples 40 × 40 × 160 mm in size were treated with a plaster grater to obtain a rough surface.

The lateral faces of the beam samples were coated with a waterproof composition (molten paraffin, epoxy resin, etc.).

The prepared beam samples were weighed with an accuracy of ± 0.01 g (mass). The linear dimensions of the wetted end face were measured with a caliper with an error of ± 0.1 mm.

Samples were placed with the end face in the bath on a mesh stand. The bath was filled with water at a temperature of (20 ± 5) ° С so that the end face was immersed in water by 5-10 mm. The water level in the bath was kept constant throughout the entire test period. After 24 hours, the samples were removed from the water, the excess water was removed from the surface of the samples with a damp cloth and weighed with an accuracy of ± 0.01 g (mass).

Water absorption during capillary suction was determined by the formula:

where m ₁ is the mass of the dry sample, kg;

m ₂ is the mass of the sample after saturation with water, kg;

S is the area of the wetted face of the sample, m;

, ч^-0,5.k _w - coefficient taking into account the time of saturation of the sample and equal

, h ^-0.5 .

The test results of the compositions are given in table. 8.

Claims (2)

Composition for finishing, including lime powder, mineral aggregate, water, plasticizing, mineral, hydrophobizing and polymer additives, characterized in that it contains synthetic calcium hydrosilicates obtained by precipitation in the presence of 10% CaCl ₂ solution in an amount of 50 % by weight of liquid sodium glass with a silicate module of 2.8 with the addition of diatomite, the ratio of liquid: solid phase (L: T) is (L: T) = 1: 2, followed by grinding of the dried additive at a temperature of t = 100-110 C for 24 hours until the specific surface area S _ud additive = 1900 m ² / kg, and as plasticizer - Kratasol-PFM, polymeric additive - Neolith P-4400, water-repellent additives - Zincum-5, as mineral filler - sand quartz of the Ukhta deposit with fractions of 0.630-0.315 and 0.315-0.14 with a ratio of 80:20, respectively, with the following ratio of components, mass. %: Lime Fluff 16,318-21,78 Quartz sand, fractions: 0.630-0.315 40.63-44.45 0.315-0.140 10.16-11.112 Additive Neolith P-4400 0.04-0.06 Zincum-5 supplement 0.08-0.095 Plasticizer Kratasol-PFM 0.17-0.20 Synthetic Calcium Hydrosilicates 4.91-6.47 Water 20.67-22.855