RU1768545C - Method of binding agent preparation - Google Patents

Abstract

Used in the building materials industry. The preparation method involves grinding Portland cement clinker, followed by the introduction of a mixing fluid containing an additive of metasilicon and sodium tetraborate at a ratio of 2.3: 1.0-3.0: 1.0, which are dissolved in water at a temperature of 45- 55 ° C and the mixing liquid was adjusted to a density of 1150-1250 kg / m3 at a temperature of 18-22 ° C and stirring the mixture for 8-12 minutes. The structural viscosity of the cement paste is 4.1-4.6 Pa s, the adhesion strength to the hardened cement stone is 41.2-67.1 MPa / cm.

Description

The invention relates to a technology for the production of cementitious materials and can be used in the building materials industry.

There is a known method of producing cement, including grinding Portland cement clinker, preparing a mixing solution containing alkaline or alkaline earth metal lignosulfonate or sulfonated lignin in an amount of 0.10.,. 0.25% by weight of clinker and 0.25 ... 1.25 % alkali metal carbonate, and mixing the grinding product with the resulting solution.

The disadvantage of this method is the high structural viscosity of the dough and the low adhesion obtained in the cementitious to the hardened artificial base stone.

The closest in technical essence and the achieved result is a method of obtaining cement by grinding Portland cement clinker to specific

surface itching. 500 ... 600 m / kg, introducing 0.4 ... 1.0% alkali metal silicate into the mixing water, 1.0 ... 2.0% sulphite-yeast mash and mixing with the obtained grinding product solution.

A disadvantage of the known method is the low adhesion to hardened artificial stone based on a cementitious and increased structural viscosity of cement paste.

The purpose of the invention is to reduce the structural viscosity of cement paste and increase its adhesion to artificial stone from an already hardened cement mortar.

The goal is achieved by the fact that the claimed method involves grinding Portland cement clinker, followed by the introduction of a mixing fluid containing an additive of metasilicate and sodium tetraborate at a ratio of 2.3: 1.0 ... 3.0: 1.0, and mixing the mixture within 8-12 minutes Additives are dissolved at a temperature of 45el

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55 ° C and then the solution is adjusted at a temperature of 18-22 ° C to a density of 1150-1250 kg / m3.

As a Portland cement clinker, the clinker of the Belgorod cement plant of the following chemical composition was used, wt.%: Si02 2Г1 ... 24; CaO 63 ... 66; Mb 0.5.:. 4.7.8; ReO + Rv20z 2 ... 4; RaO 0.4 / .. 1: 5 OzO, 3.:. 1 ГГТГ020; 2..0,5, pp 1 ... 2.5. During the tests, sodium metasilicate according to GOST 4239-77 and sodium tetraborate according to GOST 8249-77 were used.

Portland cement clinker is subjected to grinding in a ball mill to a specific surface of at least 300 m / kg using a PSX-2 device.

The mixing fluid is prepared by dissolving in water at a temperature of 45 ... 55 ° C a mixture of sodium metasilicate and sodium tetraborate with a weight ratio of 2.3: 1.0 ... 3.0: 1.0 and subsequent bringing the solution at a temperature of 18-22 ° C to a density of 1150 ... 1250 kg / m.

The ground Portland cement clinker is shut with the resulting solution and the molding material is mixed for 8-12 minutes,

The structural viscosity of the cement paste was determined using an A.E. Desov vibro-viscometer.

Adhesion properties, namely, adhesion to hardened artificial stone, were determined by a known method.

The determination of the setting time and the activity of the binder obtained by the present method and the method described in the prototype was carried out in accordance with GOST 310.1-3.76 and GOST 310.4-76.

The test results are shown in the table.

The test results show that the cement prepared according to the proposed method is characterized by a structural viscosity of 4.1-4.6 Pa-s, adhesion strength to hardened cement stone

41.2-67.1 MPa / cm2, while the prototype has 5.8 Pa s and 38.8 MPa / cm, respectively.

Claims (1)

SUMMARY OF THE INVENTION A method for preparing a binder comprising grinding Portland cement clinker with the subsequent introduction of a mixing fluid containing an additive of alkali metal silicate, and mixing, in that the aim is to reduce the structural viscosity of the cement paste and to increase its adhesion to cement stone, as the alkali metal silicate, the mixing fluid contains sodium metasilicate and additional sodium tetraborate in their ratio, respectively 2.3: 10 ... 3.0: 1.0, which are dissolved in water at a temperature of 45-55 ° C and the mixing liquid is adjusted to a density of 1150-1250 kg / m3 at a temperature of 18-22 ° C.