RU2778749C1 - 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-SH 42.5N 41.29-44.74, sand with a grain size of not more than 0.63 mm 5.43-5.77, chamotte powder with a particle size of not more than 0.63 mm 4.93-5.23, blast furnace granulated slag with a particle size of not more than 0.63 mm 14.53-15.43, basalt powder with a particle size of no more than 0.63 mm 10.74-11.41, basalt fiber with a fiber size of 6-12 mm 0.83-0.89, protein-based foaming agent 0.03-0.05, water 18.77-19.93.

EFFECT: decrease in the coefficient of thermal expansion during the first warm–up.

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 raw material mixture for the production of lightweight heat-resistant concrete, including aluminochromium phosphate binder, refractory clay raw materials, fireclay and light aggregate, contains phosphosite as a light aggregate, and additionally aluminum powder and calcium oxide in the following ratio, wt %: aluminochromophosphate binder 13-21 , refractory clay raw materials 15.8-19.4, phosphosite 27-29, aluminum powder 0.1-0.3, calcium oxide 0.1-0.3, fireclay - the rest (SU 914537, С04В 28/34, 23.03 .1982).

The disadvantage of the known technical solution is the increased coefficient of thermal expansion during the first heating.

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 of this technical solution is the increased coefficient of thermal expansion during the first heating.

The present invention is directed to the manufacture of a new charge for the manufacture of cellular refractory concrete with a reduced coefficient of thermal expansion during the first heating.

The technical result is a decrease in the coefficient of thermal expansion during the first heating.

The technical result is achieved by the fact that the mixture 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, a protein-based foaming agent, water, granulated blast-furnace slag with a particle size of not more than 0.63 mm, fireclay powder with a particle size of not more than 0.63 mm, basalt powder 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 41.29-44.74 Specified sand 5.43-5.77 Protein Based Blowing Agent 0.03-0.05 Specified slag 14.53-15.43 Specified chamotte powder 4.93-5.23 Specified basalt powder 10.74-11.41 Specified basalt fiber 0.83-0.89 Water 18.77-19.93

EXAMPLE OF SPECIFIC IMPLEMENTATION

Production of charge for the production of cellular heat-resistant concrete on a cement binder.

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 8736-2014 “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;

- basalt 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, brand 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 the 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 injected foam”. St. Petersburg, PGUPS, 2006), “FoamCem” (the main active substance is protein hydrolyzate ; scope: 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 , foaming pH range : 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 injected 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 are determined - the coefficient of thermal expansion during the first heating. The obtained physical and mechanical characteristics of cellular heat-resistant concrete are presented in the table.

The analysis of the obtained results shows that the charge for the manufacture of cellular heat-resistant concrete based on the proposed composition has a reduced coefficient of thermal expansion during the first heating.

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/А-Ш 42.5N and additionally the mixture contains granulated blast-furnace slag with a particle size of not more than 0.63 mm, basalt powder 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 of components , wt.%: Portland cement 41.29-44.74 Specified sand 5.43-5.77 Protein Based Blowing Agent 0.03-0.05 Specified slag 14.53-15.43 Specified chamotte powder 4.93-5.23 Specified basalt powder 10.74-11.41 Specified basalt fiber 0.83-0.89 Water 18.77-19.93