RU2555993C1 - High-strength concrete - Google Patents

Abstract

FIELD: construction.SUBSTANCE: high-strength concrete from the mix comprising Portland cement, silicon dioxide containing component, an additive and water contains quartz sand with the fineness modulus, Mc. = 2.6, the crushed stone is the granite crushed stone with the fraction 5-10 mm, the silicon dioxide containing component is the colloidal solution HSiOwith the density ? = 1.014 g/cmand pH = 4±0.5 value, and the additive is the water solution with the density ? = 1.12 g/cmand pH = 7.5±0.5 consisting of the mix of polycarboxylated polymers: polycarboxylated polymer on the basis of methacrylic acid with the density ? = 0.95 g/cmand pH = 7±0.5, polycarboxylated polymer on the basis of allyl ether and maleic acid anhydrite with the density ? = 1.03 g/cmand pH = 7±0.5, sodium gluconate CHNaOand water at the following ratio of components, wt %: polycarboxylated polymer on the basis of methacrylic acid with the density ? = 0.95 g/cmand pH = 7±0.5; - 9.3-10.0; polycarboxylated polymer on the basis of allyl ether and maleic acid anhydrite with the density = 1.03 g/cmand pH = 7±0.5 - 10.2-10.4; sodium gluconate CHNaO- 2.6-2.8; water - 77.2-77.5, at the following ratio of components of high-strength concrete, wt %: Portland cement 21.1-23.2; the named crushed stone 41.94-42.82; the named sand 28.3-29.0; the named silicon dioxide containing component 0.12-0.13; the named additive 0.15-0.2; water 6.24-6.75.EFFECT: increase of mobility and survivability of concrete mix.2 tbl

Description

The invention relates to building materials and can be used for the manufacture of concrete products in civil and industrial construction, as well as in the construction of structures for special purposes, such as hydraulic structures.

Known raw mix for the manufacture of high-strength concrete (Yu.M. Bazhenov. Concrete technology. Publishing House of the Association of Building Universities (DIA), Moscow, 2002, S. 377) containing Portland cement, silica-containing component, sand, gravel, silicate flour, additive and water.

The disadvantage of this technical solution is the lack of mobility and survivability of the concrete mixture.

Known raw mix for the manufacture of high-strength concrete (RU, No. 2256629, C04B 28/04, C04B 111: 20, 07/20/2005), containing: Portland cement, sand, crushed stone, silica-containing component represented by H ₂ SiO ₃ sol with density ρ = 1.014 g / cm ³ , pH = 5-6, the addition of "DEA-M" and water.

The disadvantage of this technical solution is the lack of mobility and survivability of the concrete mixture.

The closest in technical essence to the claimed invention is high-strength concrete (RU, No. 2256630, C04B 28/04, C04B 111: 20, 07/20/2005), containing: Portland cement, sand, gravel, a silica-containing component represented by H ₂ SiO sol ₃ with a density ρ = 1.014 g / cm ³ , pH = 5-6, the additive is potassium ferruginous K ₄ Fe (CN) ₆ and water in the following ratio of components, wt.%:

Portland cement 43.58-47.08 Sand 14.43-15.69 Crushed stone 25.70-27.84 Silica-containing component represented by sol H ₂ SiO ₃ with density ρ = 1,014 g / cm ³ , pH = 5-6 0.25-0.27 Potassium supplement ferruginous K ₄ Fe (CN) ₆ 0.44-0.47 Water 12.10-12.15

The problem to which the invention is directed, is the creation of high-strength concrete with increased mobility and survivability of the concrete mixture.

The problem is achieved in that high-strength concrete contains Portland cement, sand, gravel, a silica-containing component, an additive and water. New compared to the high-strength concrete selected for the prototype, is that it contains quartz sand with a fineness modulus, Mkr. = 2.6, as crushed stone - crushed stone granite fractions of 5-10 mm, a silica-containing component represented by sol H ₂ SiO ₃ with a density of ρ = 1.014 g / cm ³ , is characterized by a pH = 4 ± 0.5, and the additive is an aqueous solution with a density of ρ = 1.12 g / cm ³ and pH = 7.5 ± 0.5 consisting of a mixture of polycarboxylate polymers: a polycarboxylate polymer based on methacrylic acid with a density ρ = 0.95 g / cm ³ and pH = 7 ± 0.5, and poly a rboxylate polymer based on allyl ether and maleic anhydrite with a density ρ = 1.03 g / cm ³ and pH = 7 ± 0.5; sodium gluconate, C ₆ H ₁₁ NaO ₇ and water in the following ratio of components, wt.%:

 Polycarboxylate polymer based on methacrylic acid with density ρ = 0.95 g / cm ³ and pH = 7 ± 0.5 9.3-10.0  Polycarboxylate polymer based on allyl ether and maleic anhydrite with a density ρ = 1.03 g / cm ³ and pH = 7 ± 0.5 10.2-10.4 Sodium gluconate, C ₆ H ₁₁ NaO ₇ 2.6-2.8  Water 77.2-77.5

In the following ratio of components of high-strength concrete, wt.%

Portland cement 21.1-23.2 Specified crushed stone 41.99-42.82 Indicated sand 28.3-29.0 The specified silica-containing component 0.12-0.13 Specified Additive 0.15-0.2 Water 6.24-6.75

The combined presence of polycarboxylates of different nature in combination with silica sol increases the mobility of the concrete mixture by 3 times in relation to the control composition. The addition of sodium gluconate increases the survivability of the concrete mixture, i.e. the mobility of the concrete mixture is increased by 3 times, from 30 minutes to 90 minutes.

At the filing date, according to the authors and the applicant, the claimed high-strength concrete is not known and this technical solution has world novelty.

The claimed combination of essential features exhibits a new property in the presence of a silica sol with a density ρ = 1.014 g / cm ³ characterized by a pH value of 4 ± 0.5, and additives with a density ρ = 1.12 g / cm ³ and pH = 7, 5 ± 0.5, represented by a mixture of polycarboxylate polymers: a polycarboxylate polymer based on methacrylic acid with a density ρ = 0.95 g / cm ³ and pH = 7 ± 0.5, and a polycarboxylate polymer based on allyl ether and maleic anhydrite with a density ρ = 1.03 g / cm ³ and pH = 7 ± 0.5, sodium gluconate C ₆ H ₁₁ NaO ₇ and water, namely, it increases the mobility nost and survivability of concrete mix.

According to the authors and the applicant, the claimed invention meets the eligibility criteria - inventive step.

The claimed invention is industrially applicable and can be used in civil engineering and in monolithic construction of structures for special purposes.

An example of a specific implementation.

1. Preparation of silica sol:

1.1. Sodium liquid glass is dosed.

1.2. Dose water.

1.3. The metered-dose components according to p. 1. and p. 2. are mixed until a solution is obtained with ρ = 1.016 g / cm ^3.

1.4. The solution prepared according to p. 1.3 is passed through a cation exchange column containing KU-2-8 cation exchange resin.

1.5. At the column outlet, a sol solution of H ₂ SiO _{3 is} obtained, which has a density ρ = 1.014 g / cm ³ , while the finished product is a sol with pH = 4 ± 0.5.

2. Preparation of the additive:

2.1. A polycarboxylate polymer based on methacrylic acid with a density of ρ = 0.95 g / cm ³ and pH = 7 ± 0.5 is metered;

2.2. A polycarboxylate polymer based on allyl ether and maleic anhydrite is dosed with a density of ρ = 1.03 g / cm ³ and pH = 7 ± 0.5;

2.3. Dose sodium gluconate C ₆ H ₁₁ NaO _7.

2.4. Dose water.

2.5. The components dispensed in accordance with clauses 2.1, 2.2., 2.3, and 2.4 are thoroughly mixed until a solution is obtained with a density ρ = 1.12 g / cm ³ and pH = 7.5 ± 0.5.

3. The components of high-strength concrete are dosed: Portland cement, quartz sand with a fineness modulus, Mkr = 2.6, and crushed stone granite fractions of 5-10 mm.

3.1. The dispensed components according to claim 3 are transported to a concrete mixer of any modern design used at the factory.

3.2. Dose water.

3.3. The silica-containing component prepared according to Clause 1.5 is dosed.

3.4. Dose the additive prepared according to paragraph 2.5.

3.5. Components dispensed in accordance with clause 3.3. and p. 3.4, transported to metered water.

3.6. The mixture prepared according to clause 3.5 is transported to a concrete mixer.

3.7. All components in the concrete mixer are thoroughly mixed for 3 minutes.

3.8. The ready-mixed concrete for high-strength concrete is transported to the place of manufacture of the products.

3.9. The concrete mixture prepared according to Clause 3.8 is taken directly from the concrete mixer to control the physical and mechanical characteristics. The determination of physical and mechanical characteristics is carried out as follows: the mobility of the concrete mixture and the survivability of the concrete mixture according to GOST.

The results on the mobility and survivability of the concrete mixture are presented in table 1, 2.

Studies have shown that the mobility of the concrete mixture increases 3 times in relation to the control composition, and the survivability of the concrete mixture, i.e. maintaining the mobility of the concrete mixture, increases 3 times from 30 minutes to 90 minutes.

Claims (1)

High-strength concrete from a mixture including Portland cement, sand, crushed stone, a silica-containing component, an additive and water, characterized in that it contains quartz sand with a fineness modulus, Mkr. = 2.6, and crushed stone - granite fraction 5- 10 mm, as a silica-containing component contains sol H₂SiO₃ with density ρ = 1.014 g / cm³ and pH = ± 0.5, and as an additive contains an aqueous solution with a density ρ = 1.12 g / cm³ and pH = 7.5 ± 0.5, consisting of a mixture of polycarboxylate polymers: a polycarboxylate polymer based on methacrylic acid with a density of ρ = 0.95 g / cm³ and pH = 7 ± 0.5, a polycarboxylate polymer based on allyl ether and maleic anhydrite with a density ρ = 1.03 g / cm³ and pH = 7 ± 0.5, sodium gluconate C₆H_elevenNaO₇ and water, in the following ratio of components, wt.%:
Polycarboxylate polymer based on methacrylic acid with density ρ = 0.95 g / cm³ and pH = 7 ± 0.5 9.3-10.0 Polycarboxylate polymer based on allyl ether and maleic anhydrite with density ρ = 1,03 g / cm³ and pH = 7 ± 0.5 10.2-10.4 Sodium Gluconate, C₆H_elevenNaO₇ 2.6-2.8 Water 77.2-77.5
In the following ratio of components of high-strength concrete, wt.%:
Portland cement 21.1-23.2 Specified crushed stone 41.94-42.82 Indicated sand 28.3-29.0 The specified silica-containing component 0.12-0.13 Specified Additive 0.15-0.2 Water 6.24-6.75