RU2478593C1 - Mortar - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: invention relates to building materials and can be used as a waterproofing compound which is used in civil and industrial construction. The mortar contains the following, wt %: portland cement 27.615-29.412, alumina cement 4.202-5.021, 100 mcm fraction dolomite limestone 8.403-8.536, bentonite clay 0.840-0.921, 0.63 mm fraction building sand 38.215-38.539, acrylate copolymer Neolith 1.681-1.715, potassium sulphate K₂SO₄ 1.008-1.046, hyper-plasticiser MeFlux 0.269-0.284, air-entraining agent SNV 0.003-0.005, water 15.967-16.318.

EFFECT: high water impermeability, reduced demixing of the mortar.

1 ex, 1 tbl

Description

The invention relates to the construction materials industry and can be used as a waterproofing composition used in civil and industrial construction.

Known mortar containing a binder, mineral filler, laundry soap and water, as a binder solution contains carboxymethyl cellulose, and as a filler - dolomite dust (SU No. 5447427; С04В 25/08; publ. Bull. No. 7 - 25.02.77 g .).

The disadvantage of this technical solution is the lack of water resistance and increased stratification of the waterproofing solution and the waterproofing mortar mixture.

Known mortar, including Portland cement, sand, a complex chemical additive consisting of Peramin-SRA superplasticizer, cellulose ether with a viscosity of 1% solution at 20 ° C, equal to 7000 MPa / s, an expanding additive for Denka CSA cement and sodium fluoride, and also contains lime component represented by dolomitic limestone (RU No. 2376256 С04В 28/04, publ. Bulletin No. 35 of December 20, 2009).

The disadvantage of this technical solution is the lack of water resistance and increased stratification of the waterproofing solution and the waterproofing mortar mixture.

Closest to the claimed mortar is a mortar containing Portland cement, alumina cement, sand for construction work fractions of 0.63 mm, dolomitic limestone with a grain size of 100 microns, an additive represented by superplasticizer C-3 and magnesium sulfate and water in the following ratio of components , wt.%:

 Portland cement 26.18-32.18  alumina cement 3.76-4.56  specified sand 37.3-38.3  specified limestone 7.34-9.34  superplasticizer C-3 1.88-2.48  magnesium sulfate 1.37-1.97  water 16.17-17.17

(RU No. 2373166, C04B 28/00, bull. No. 32 dated 11/20/2009).

The disadvantage of this technical solution is the lack of water resistance of the solution and the increased stratification of the waterproofing mortar mixture.

The objective of the invention is the creation of a new mortar, the use of which would allow to achieve a technical result, consisting in increasing the water resistance and reducing the delamination of the waterproofing mortar mixture.

The technical result is achieved by the fact that the mortar, including Portland cement, alumina cement, sand for construction work with a fraction of 0.63 mm, dolomitic limestone with a grain size of 100 microns, an additive and water, additionally contains bentonite clay, and Neolith acrylate copolymer as an additive , potassium sulfate (K ₂ SO ₄ ), MeFlux hyperplasticizer based on polycarboxylate esters and an STF air-entraining additive in the following ratio of components, wt.%:

 Portland cement 27,615-29,412  alumina cement 4,202-5,021  specified limestone 8,403-8,536  bentonite clay 0.840-0.921  specified sand 38,215-38,539  Neolith Acrylate Copolymer 1,681-1,715 potassium sulfate K ₂ SO ₄ 1.008-1.046  Meplux hyperplasticizer 0.269-0.284  START air-entraining additive 0.003-0.005  water 15,967-16,318

Compared with the known mortars, the combination of the well-known components of Portland cement, alumina cement, sand for construction fractions of 0.63 mm, dolomitic limestone with a fraction size of 100 microns, bentonite clay, Neolith acrylate copolymer, potassium sulfate K ₂ SO ₄ , MeFlux hyperplasticizer is new based on polycarboxylate esters and an air-entraining additive START.

The use of potassium sulfate (K ₂ SO ₄ ), MeFlux hyperplasticizer and STA air-entraining additives contribute to compaction and formation of a structure with a uniform distribution of small pores throughout the volume, by reducing the amount of mixing water, increasing the degree of hydration of cement minerals, and also forming closed small pores in the presence of strategic offensive arms. In addition, the presence of bentonite clay, which is characterized by a layered structure with a high specific surface and having high adsorption capacity, helps to reduce the delamination of the mortar mixture.

At the filing date, according to the authors and the applicant, the claimed mortar is not known and this technical solution has a world novelty.

The claimed combination of essential features exhibits a new property: increasing water resistance and decreasing the stratification of the mortar waterproofing mixture.

It is another property of the aggregate that is not equal to the known properties of the distinguishing features that allows us to recognize this aggregate as compared with the new solutions known in science and technology, and the claimed invention corresponds to the eligibility criterion - inventive step.

The claimed invention is industrially applicable and can be used for the manufacture of mortar used for the manufacture of mortar, for waterproofing penetrating coating.

Concrete example

Mortar preparation:

- dose:

 Portland cement (PTs400D20);

 alumina cement;

 sand for construction work fraction 0.63 mm;

 dolomitic limestone with a fraction size of 100 microns;

 bentonite clay, in accordance with GOST 28177-89;

potassium sulfate K ₂ SO ₄ ;

 water

 additives for concrete in accordance with GOST 24211-91:

 Neolith Acrylate Copolymer;

 MeFlux polycarboxylate ester hyperplasticizer;

 STA air-entraining additive;

- metered components are transported to a horizontal batch screw mixer and mixed thoroughly until a homogeneous mortar mixture is obtained;

- the resulting mortar mixture is used for the manufacture of a waterproofing coating;

- water resistance is determined according to GOST 12730.5-84;

- the stratification of the mortar mixture of waterproofing action is determined according to GOST5 802-86.

The results of physical and mechanical tests of mortar and mortar mixture of waterproofing action are presented in table 1.

The results show that the specified component composition provides a mortar with a 2 times increased water resistance and reduced by 4% stratification of the mortar to a value of 98%.

Claims (1)

Mortar, including Portland cement, alumina cement, sand for construction fraction 0.63 mm, dolomitic limestone fraction 100 microns, additive, water, characterized in that it further contains bentonite clay, and as an additive - a copolymer of acrylates Neolith, potassium sulfate K ₂ SO ₄ , MeFlux hyperplasticizer based on polycarboxylate esters and an air-entraining START additive in the following ratio, wt.%:
Portland cement 27,615-29,412 alumina cement 4,202-5,021 specified limestone 8,403-8,536 bentonite clay 0.840-0.921 specified sand 38,215-38,539 Neolith Acrylate Copolymer 1,681-1,715 potassium sulfate K ₂ SO ₄ 1.008-1.046 Meplux hyperplasticizer 0.269-0.284 START air-entraining additive 0.003-0.005 water 15,967-16,318