RU2393127C1 - Complex additive for foam concrete mixture - Google Patents

Abstract

FIELD: chemistry. ^ SUBSTANCE: invention pertains to a complex additive for a foam concrete mixture and can be used in the construction materials industry. The complex additive contains the following, in wt %: calcium carbonate with fineness of 3000 cm2/g 70.6-84.8, silica sol 4.6-6.0, protein-based foaming additive 1.3-1.5, sodium chloride 9.3-21.9. ^ EFFECT: reduced shrinkage and heat conductivity of the foam concrete. ^ 1 ex, 1 tbl

Description

The invention relates to building materials and can be used as a complex additive in the mortar mixture in the production of foam concrete.

Known complex additive in mortar mixtures containing amylose (RU No. 2143341, С04В 28/02, publ. 12/27/1999). The disadvantage of this additive is not sufficiently low shrinkage and thermal conductivity of the resulting materials.

Closest to the proposed invention is a complex additive containing amylose and sol of silicic acid in the following ratio of components, wt.%: Amylose - 30-40; silica sol - 60-70 (RU No. 2278839, C04B 22/08, publ. 06/27/2006).

The disadvantage of this complex additives is not sufficiently low shrinkage and thermal conductivity of the resulting materials.

The objective of the invention is to reduce shrinkage and thermal conductivity of foam concrete.

The technical result of the invention is achieved in that the complex additive for the foam concrete mixture containing a silica sol also contains a protein-based foam-forming additive, calcium carbonate with a fineness of grinding of 3000 cm ² / g and sodium chloride in the following ratios of components, wt.%:

Calcium carbonate with a fineness of grinding of 3000 cm ² / g 70.6-84.8 Silicic acid sol 4.6-6.0 Protein Based Foaming Agent 1.3-1.5 Sodium chloride 9.3-21.9

Concrete example

The complex additive for the foam concrete mixture is added to the foam concrete mixture in the following ratios of components, wt%:

Calcium carbonate with a fineness of grinding of 3000 cm ² / g 70.6-84.8 Silicic acid sol 4.6-6.0 Protein Based Foaming Agent 1.3-1.5 Sodium chloride 9.3-21.9

The following brands can be used as a protein-based foaming additive: Addiment SB 31L (dark brown liquid, foaming pH range: 6-10; the main active substance is proteine hydrolyzate (A. Khitrov, abstract of the abstract Doctor of Technical Sciences “Technology and properties of foam concrete, taking into account the nature of the foam introduced.” St. Petersburg: PGUPS, 2006); application: as an additive for the production of foam concrete; trademark RENIMENT SB 31L; manufacturing company “SIKA ADDIMENT GmbH” B-69171 Leimen, Germany), as well as FOAMCEM (the main active substance is proteingid Rolizate; scope: foaming agent for the preparation of lightweight cellular concrete; manufacturer Laston Italiana SPA) and GreenFroth-P (the main active substance is protehydrolyzate; scope: for the production of foam concrete, as well as for the manufacture of light wall and decoration; manufacturer ISOLTECH snc di Scarpa & C ”Via C. Colombo, 41 24020 RANICA (BG), Italy).

Below are the results of a study of the proposed complex additives for foam concrete mix.

To the cement mixture of the composition, wt.%: Portland cement grade M400-D20 - 89%, siliceous aggregate - 11% add the specified complex additive for foam concrete in the amount of 32.1% by weight of cement, with a water-binding ratio (W / V) 0, 39.

Samples of medium-density foam concrete D600, manufactured with the proposed complex additive for foam concrete, harden under natural conditions.

Determination of thermal conductivity was carried out at the age of 28 days in accordance with GOST 7076-99.

The determination of shrinkage was carried out in accordance with GOST 25485-89.

The results are presented in the table.

The analysis of the results given in the table indicates that the introduction of the specified complex additives for the foam concrete mixture leads to a decrease in shrinkage and thermal conductivity of the foam concrete in comparison with the values achieved when using the prototype.

The shrinkage and thermal conductivity of the foam concrete obtained using the proposed complex additive for the foam concrete mixture containing calcium carbonate with fineness of 3000 cm ² / g, sol of silicic acid, a protein-based foam-forming additive and sodium chloride in the following ratios of components, wt.%: Calcium carbonate with a fineness of grinding of 3000 cm ² / g 70.6-84.8; silica sol 4.6-6.0; protein-based foam-forming additive 1.3-1.5; sodium chloride 9.3-21.9:

Table No. Complex additive, wt.% Shrinkage, mm / m The coefficient of thermal conductivity, W / (m · ° C) Famous supplement one Amylose 35 Silicic acid sol 65 3 0.17 Additive according to the invention one Calcium carbonate with a fineness of grinding of 3000 cm ² / g 84.8 2.0 0.13 Silicic acid sol 4.6 Protein Based Frother - Addiment SB 31L 1.3 Sodium chloride 9.3 2 Calcium carbonate with a fineness of grinding of 3000 cm ² / g 77.7 1.8 0.12 Silicic acid sol 5.3 Protein Based Frother - Addiment SB 31L 1.4 Sodium chloride 15.6 3 Calcium carbonate with a fineness of grinding of 3000 cm ² / g 70.6 1.9 0.13 Silicic acid sol 6.0 Protein Based Frother - Addiment SB 31L 1,5 Sodium chloride 21.9

Claims (1)

A complex additive comprising a silica sol, characterized in that it additionally contains calcium carbonate with a fineness of 3000 cm ² / g, a protein-based foaming additive and sodium chloride in the following ratio, wt.%:
Calcium carbonate having a fineness of 3000 cm ² / g 70.6-84.8 Silicic acid sol 4.6-6.0 Protein Based Foaming Agent 1.3-1.5 Sodium chloride 9.3-21.9