RU2470891C2 - Dry plaster mixture for decorative finishing of building faces - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: invention relates to construction, particularly composition of a dry plaster mixture for decorative finishing of building faces. The dry plaster mixture for decorative finishing of building faces, which contains quartz sand, additionally contains white portland cement M 400 and asphalt-concrete plant wastes - carbonate-silica dust, which contains compounds whose possible variations lie in the following range (%): CaCO₃ - 55-60, MgCO₃ - 22-25, SiO₂ - 10-13, with the following ratio of components, wt %: white portland cement M 400 28-37, carbonate-silica dust 10-15, quartz sand 48-62.

EFFECT: improved adhesion-cohesion properties, high frost resistance, water resistance and whiteness for free colour toning of the plaster during decorative finishing of building faces.

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Description

The invention relates to the field of construction, in particular to the production of dry plaster mix for decorative decoration of building facades.

Known dry plaster mixture, including hydrating components and inorganic fillers / SP 82-101-98. Preparation and use of building solutions / [1], which contains, wt.%: Lime dough - 10, Portland cement M 400-20, mountain yellow sand - 15, marble sand - 40, marble flour - 10, ocher - 4.5 , the mummy is 0.5.

The disadvantage of this composition is the relatively low adhesive-cohesive indicators, as well as low frost resistance and water resistance (fragility) of the facade composition.

Known dry plaster mixture, including hydrating components and inorganic fillers / SP 82-101-98. Preparation and use of building solutions / [1], which contains, wt.%: Lime dough - 10, white Portland cement M 400 - 7, marble sand - 70, marble flour - 13.

The disadvantage of this composition is the relatively low adhesive-cohesive indicators, as well as low frost resistance and water resistance (fragility) of the facade composition.

Known dry plaster mixture, including hydrating components and inorganic fillers / SP 82-101-98. Preparation and use of building solutions / [1], which contains, wt.%: Lime dough - 20, Portland cement gray M 400 - 5, quartz sand - 74, manganese peroxide - 1. Accepted as a prototype.

The disadvantage of this composition is the relatively low adhesive-cohesive indicators, as well as low frost resistance and water resistance (fragility) of the facade composition.

The essence of the invention is to increase durability and increase the degree of whiteness of the plaster for the decoration of building facades.

The technical result of the invention is to increase the adhesion-cohesive indicators, frost resistance, water resistance and the degree of whiteness for free color tinting of decorative plaster mix for finishing building facades.

The specified technical result is achieved by the fact that Portland cement white M 400 and industrial waste from the asphalt concrete plant — carbonate-siliceous dust containing compounds whose possible fluctuations are in the range (%) are additionally added to the well-known plaster dry mixture for decorative decoration of building facades, including quartz sand : CaCO ₃ - 55-60%, MgCO ₃ - 22-25%, SiO ₂ - 10-13%, with the following ratio of components, wt.%:

Portland cement white M400 28-37 carbonate silica dust 10-15 quartz sand 48-62.

The use of carbonate-siliceous dust allows to achieve a high degree of adhesion of mineral particles to the surface. The difference from the known fillers obtained by mechanical grinding of marble, dolomite flour is a high chemisorption ability, which is explained by the conditions for the formation of carbonate-siliceous dust and, accordingly, chemical activity with respect to the components of cement clinker, which underlies the increase in adhesion. . S.F. Korenkova, T.V. Sheina; Samarsk. state arch-build. un-t - Samara, 2004 .-- 203 p. / [2]. The light color of carbonate-silica dust allows you to replace known fillers, while maintaining the possibility of color tinting of the plaster mixture.

Physicochemical processes during the hardening of white Portland cement M 400 and carbonate-siliceous dust allow synergistically enhance the useful properties of the components (adhesive strength increases by 1.8 times, frost resistance increases by 2.5 times, water resistance increases by 34%). An additional increase in frost resistance, water resistance and adhesion of the facade plaster is the result of the absence of brownmillerite mineral in white cement M 400 and the result of chemical interaction of carbonate-siliceous dust with aluminates of cement clinker, during which a new crystalline compound of the fibrous structure is formed - calcium hydrocarbonaluminate (3CaO * Al ₂ O ₃ * CaCO ₃ * 11H ₂ O).

Information confirming the possibility of carrying out the invention. For the preparation of dry stucco mixture for decorative decoration of building facades the following was used: quartz sand; white Portland cement M 400; carbonate-silica dust with a particle size of 60-90 nm. The dispersion of carbonate-silica dust was studied using the small angle neutron scattering method (SANS) at the B.P. Konstantinov Petersburg Institute of Nuclear Physics / Research of nanodispersed modifiers of concrete properties by the small angle neutron scattering method / AMGuryanov, S.F. Korenkova, V.T. .Lebedev, V.M. Lebedev // - X-ray, synchrotron radiation, neutrons and electrons for the study of nanosystems and materials: Materials of the 8th international conference. - M.: IR RAS-RSC KI, 2009. - P.317 / [3]. The proportions of the plaster dry mix for decorative decoration of building facades are as follows: carbonate-siliceous dust in an amount of 10 to 15% was introduced into the cement slurry, then quartz sand was added and control samples were made to determine the frost and water resistance of the coating according to standard methods / GOST 5802-86. Building solutions. Test methods / [4].

The compositions of the dry plaster mixes for the decorative decoration of facades are shown in table 1.

After preparing the decorative facade plaster mixture, control samples were made to determine the adhesive strength according to the standard method / GOST 28089-89. Wall constructions / [5].

The properties of facade plasters are given in table 2.

Table 1 Dry plaster mixes for the decoration of building facades Name of components The content of components,% by weight Composition No. 1 Composition No. 2 Composition No. 3 Composition No. 4 Portland cement white M 400 28 32 36 37 Carbonate-silica dust 10 12 13 fifteen Quartz sand 62 56 51 48

Carbonate-siliceous dust used in the compositions shown in table 1 contains active compounds (wt.%) CaCO ₃ 59, MgCO ₃ 24, SiO ₂ 13 and inactive impurities that do not affect the final result: Fe ₂ O ₃ 3, SO ₃ 1.

table 2 Properties of decorative facade plasters Composition number Adhesion, kg / cm ² Frost resistance, number of cycles Softening coefficient one 5.9 80 0.92 2 6.4 90 0.92 3 6.8 110 0.91 four 7.3 125 0.91 Prototype 4.1 fifty 0.82

In accordance with the principles of the multistructural theory of building composites, carbonate-siliceous dust can be considered as a nanofiller with its physical and chemical properties, which as part of multilevel composite materials will be carbonate-siliceous dust composites can be considered as a nanofiller with its physical and chemical properties, which are part of multilevel composite materials will actively participate in processes at the interface between individual phases and components in form of different chemical composition, type of connection and structure phase, affecting the structure and properties of the formed facade building materials, thereby improving the durability (adhesion, water and frost resistance) of the coating. The light color of carbonate-silica dust allows you to replace known fillers, while maintaining the possibility of color tinting of the plaster mixture. The use of the claimed invention in the production of dry plaster mortar for building facades allows you to dispose of a common industrial nano-waste - carbonate-siliceous dust from an asphalt concrete plant, which helps to protect the environment.

INFORMATION SOURCES

1. SP 82-101-98. Preparation and use of building solutions.

2. Korenkova S.F. Fundamentals and concept of utilization of chemical sludge from industrial waste in the construction industry / Korenkova S.F., Sheina T.V .; Samarsk. state arch-build. un-t - Samara, 2004 .-- 208 p.

3. The study of nanodispersed modifiers of concrete properties by the method of small-angle neutron scattering / AM Guryanov, S. F. Korenkova, V. T. Lebedev, V. M. Lebedev // - X-ray, synchrotron radiation, neutrons and electrons for the study of nanosystems and materials: Materials 8th international conference. - M.: IR RAS-RSCI, 2009. - P.317.

4. GOST 5802-86. Building solutions. Test methods.

5. GOST 28089-89. Wall constructions.

Claims (1)

Dry plaster mixture for decorative decoration of building facades, including quartz sand, characterized in that it additionally contains white Portland cement M 400 and asphalt concrete plant waste - carbonate-siliceous dust containing compounds, the possible fluctuations of which are in the range (%): CaCO ₃ - 55-60, MgCO ₃ - 22-25, SiO ₂ - 10-13 in the following ratio of components, wt.%:
Portland cement white M 400 28-37 carbonate silica dust 10-15 quartz sand 48-62