RU2777819C1 - Charge for the manufacture of cellular heat-resistant concrete - Google Patents

Abstract

FIELD: construction materials.

SUBSTANCE: invention relates to the field of construction materials, in particular to heat-resistant concrete intended for use in conditions of elevated temperatures. The charge for the manufacture of cellular heat-resistant concrete contains, wt. %: Portland cement CEM II/A-W 42.5N 40.76 - 44.23, sand with a grain size of no more than 0.63 mm 5.37 - 5.70, chamotte powder with a particle size of no more than 0.63 mm 4.87 - 5.17, protein-based foaming agent 0.04 - 0.06, blast furnace slag granulated with a particle size of no more than 0.63 mm 24.98 - 26.53, basalt fiber with a fiber size of 6-12 mm 1.96 - 2.08, water 18.55 - 19.70.

EFFECT: increase in axial tensile strength.

1 cl, 1 tbl, 1 ex

Description

The invention relates to the field of building materials, in particular to heat-resistant concrete intended for use at elevated temperatures.

Known mixture with the relationship between the strength of autoclaved concrete in compression and tension, investigated on samples of cellular concrete, including cement 27-31%, lime 15-19%, sand 51-55%, foaming agent 0.3-0.5% and water ( Application of cellular concrete products. Theory and practice. / S. L. Galkin [et al.], Strikno. Mn.: 2006. - 448 p.).

The disadvantage is a reduced rate of axial tension for structures that require increased deformability of the heat-resistant material.

The closest technical solution to the claimed invention is a mixture for the manufacture of cellular heat-resistant concrete containing, wt.%: Portland cement 50.79-55.11, sand with a grain size of not more than 0.63 mm 7.10-8.89, fireclay powder with particle size not more than 0.63 mm 0.58-1.02, protein-based foaming agent 0.35-0.37, silica sol 0.01-0.03, water 36.85-38.90 (RU No. 2753881, С04В 38/10, 08/24/2021).

The disadvantage is a reduced rate of axial tension for structures that require increased deformability of the heat-resistant material.

The present invention is directed to the manufacture of a new mixture for the manufacture of cellular refractory concrete with increased axial tensile strength.

EFFECT: increased axial tensile strength.

The technical result is achieved by the fact that the composition for the manufacture of charge for the manufacture of cellular heat-resistant concrete contains Portland cement CEM II / A-Sh 42.5N, sand with a grain size of not more than 0.63 mm, fireclay powder with a particle size of not more than 0.63 mm, granulated blast-furnace slag with a particle size of not more than 0.63 mm, water, a protein-based foaming agent, basalt fiber with a fiber length of 6-12 mm, in the following ratio, wt.%:

Portland cement 40.76 - 44.23 Specified sand 5.37 - 5.70 Specified chamotte powder 4.87 - 5.17 Specified slag 24.98 - 26.53 Protein Based Blowing Agent 0.04 - 0.06 Specified basalt fiber 1.96 - 2.08 Water 18.55 - 19.70

Example of a specific implementation

Production of charge for the production of cellular heat-resistant concrete with increased axial tensile strength.

1. Dosing and loading into the mixer of dry components occurs in the following sequence:

- Portland cement with slag CEM II / A-Sh 42.5N, meeting the requirements of GOST 31108-2016;

- fine sand according to GOST 8763-2014 “Sand for construction work. Specifications” with a grain size of not more than 0.63 mm;

- fireclay powder with a particle size of not more than 0.63 mm;

- granulated ground blast furnace slag, with a particle size of not more than 0.63 mm according to TU 0799-001-99126491-2013;

- water in accordance with GOST 23732-79, while basalt fiber is introduced into the mixing water according to TU 5952-002-13307094-2008, grade BS17-12.7 (1/2'') r-KV-13 with a fiber length of 6 -12 mm in the indicated quantity.

2. Mixing of raw materials in the mixer.

3. Porosization of the mixture due to separately prepared foam from a foaming agent solution. The following brands can be used as a foaming agent: Addiment SB 31L (trademark RENIMENT SB 31L, manufacturer "SIKA ADDIMENT GmbH" B-69171 Leimen, Germany, base - protein hydrolysates, dark brown liquid, foaming pH range: 6 -10 (Khitrov A.V., abstract for the competition of an academic senior doctor of technical sciences “Technology and properties of foam concrete, taking into account the nature of the introduced foam”. St. Petersburg, PGUPS, 2006)), “FoamCem” (the main active substance is protein hydrolyzate; field of application: foaming agent for the preparation of lightweight cellular concrete; manufacturer Laston Italiana SPA), "Neopor" (manufacturer Neopor System GmbH, Germany, protein base, dark-colored liquid, surface tension 45-55 J / m ² , pH range foaming: 6-8 (Khitrov A.V., abstract for the competition of an academic senior candidate of technical sciences “Obtaining modern autoclaved foam concrete, taking into account the nature of the introduced building foams”, St. Petersburg, PGUPS, 2000).

4. Laying the prepared mixture of cellular concrete into molds.

5. Temperature and humidity conditions of hardening 10 hours, 4 hours of which - cooling, at a temperature of 80-90°C, in accordance with GOST 20910-19.

6. Drying of finished products for 48 hours at a temperature of 100±2°C according to GOST 20910-19.

Next, the physical and mechanical characteristics of cellular heat-resistant concrete were determined - the axial tensile strength. The obtained physical and mechanical characteristics of cellular heat-resistant concrete on a cement binder are presented in the table.

Analysis of the obtained results shows that cellular heat-resistant concrete based on the proposed composition has an increased axial tensile strength.

Claims (2)

Mixture for the manufacture of cellular heat-resistant concrete containing Portland cement, sand with a grain size of not more than 0.63 mm, fireclay powder with a particle size of not more than 0.63 mm, a protein-based foaming agent and water, characterized in that CEM Portland cement is used as Portland cement II/A-Sh 42.5N and additionally the mixture contains granulated blast-furnace slag with a particle size of not more than 0.63 mm and basalt fiber with a fiber size of 6-12 mm in the following ratio, wt.%: Portland cement 40.76 - 44.23 Specified sand 5.37 - 5.70 Specified chamotte powder 4.87 - 5.17 Specified slag 24.98 - 26.53 Protein Based Blowing Agent 0.04 - 0.06 Specified basalt fiber 1.96 - 2.08 Water 18.55 - 19.70