RU2562310C1 - High-strength concrete - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: high-strength concrete produced from a mixture containing Portland cement, sand, crushed stone, water and a complex additive, contains quartz sand with fineness modulus, M_fineness=2.7 as sand, granite crushed stone with particle size of 5-10 mm as crushed stone and a complex additive with density of 1.017 g/cm³ and pH 6.5±0.5, which consists of iron hydroxide sol (III) with density ρ=1.021 g/cm³ and pH 5.0±0.5, and a plasticising agent from a mixture of polycarboxylate polymers: a polycarboxylate polymer on the basis of methacrylic acid with density ρ=0.95 g/cm³ and pH 7.0±0.5, a polycarboxylate polymer on the basis of an allyl ester and an anhydride of maleinic acid with density ρ=1.03 g/cm³ and pH 7.0±0.5, and water at the following component ratio, wt %: polycarboxylate polymer on the basis of methacrylic acid with density ρ=0.95 g/cm³ and pH 7±0.5-10.5-11.5; polycarboxylate polymer on the basis of an allyl ester and an anhydride of maleinic acid with density ρ=1.03 g/cm³ and pH 7±0.5-11.5-11.8; iron hydroxide sol (III) with density ρ=1.021 g/cm³, pH 5.0±0.5-8.0-8.5; water - 69.0-69.2 at the following component ratio of raw mixture, wt %: Portland cement 17.7-18.4; the above sand 41.62-42.0; the above crushed stone 32.8-33.0; the above additive 0.18-0.2; water - 7.0-7.1.

EFFECT: reduction of settlement of concrete at the age of 120 days by 3,16 times.

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Description

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

A known raw material mixture for the manufacture of high-strength concrete (Yu.M. Bazhenov. Concrete technology. Publishing house of the Association of Building Universities (DIA), Moscow, 2002, p. 377), containing Portland cement, silica-containing component, sand, gravel, silicate flour, additive and water.

The disadvantage of this technical solution is the increased shrinkage of concrete.

Known raw material mixture for the manufacture of high-strength concrete (RU No. 2256629, С04В 28/04, published July 20, 2005) containing Portland cement, sand, gravel, a silica-containing component represented by orthosilicic acid sol with a density of 1.014 g / cm ³ , a hydrogen indicator 5-6, the supplement "DEYA-M" and water.

The disadvantage of this technical solution is the increased shrinkage of concrete.

The closest in technical essence to the claimed invention is high-strength concrete (RU No. 2425814, С04В 28/04, 22/06, 24/24, 111/20, publ. 08/10/2011), containing Portland cement, sand, gravel, additive and water, the additive is complex and consists of an iron (III) hydroxide sol with a density of 1.021 g / cm ³ , a hydrogen index of 4.5-5.5 and a Peramin SMF-10 hyperplasticizer based on polycarboxylic polymers of the Swedish company Perstorp ( ASTM C494 type F, DIN 1045, BS 5075 parts 1 and 3, EN 934-2) in the following ratio of components, wt. %:

Sol of iron (III) hydroxide with a density of 1.021 g / cm ³ , pH value 4.5-5.5 85.50-86.00 Peramin hyperplasticizer SMF-10 14.00-14.50

in the following ratio of components of the raw mix, wt. %:

Portland cement 20.60-27.40 Sand 21.80-24.70 Crushed stone 42.40-44.50 Specified Additive 1.00-1.45 Water 7.40-8.75

The disadvantage of this technical solution is the increased value of concrete shrinkage.

The problem to which the invention is directed, is to reduce the shrinkage of high-strength concrete.

The technical result is achieved by the fact that high-strength concrete obtained from a mixture containing Portland cement, sand, crushed stone, water and a complex additive contains quartz sand with a fineness modulus, Mkr. = 2.7, and crushed stone - granite fractions 5 as sand. -10 mm and a complex additive with a density of 1.017 g / cm ³ and a pH of 6.5 ± 0.5, consisting of an iron (III) hydroxide sol with a density of ρ = 1.021 g / cm ³ and a pH of 5.0 = 0 , 5 and a plasticizer from a mixture of polycarboxylate polymers: a polycarboxylate polymer based on methacrylic acid with a flat v, ρ = 0.95 g / cm ³ and pH 7.0 ± 0.5, a polycarboxylate polymer based on allyl ether and maleic anhydrite with a density ρ = 1.03 g / cm ³ and pH 7.0 ± 0, 5 and water in the following ratio of components, wt. %:

Polycarboxylate polymer based on methacrylic acid with a density ρ = 0.95 g / cm ³ and a pH of 7 ± 0.5 10.5-11.5 Polycarboxylate polymer based on allyl ether and maleic anhydrite with a density ρ = 1.03 g / cm ³ and a pH of 7 ± 0.5 11.5-11.8 Iron (III) hydroxide sol with a density ρ = 1,021 g / cm ³ , a pH of pH 5.0 ± 0.5 8.0-8.5 Water 69.0-69.2

in the following ratio of components of the raw mix, wt. %:

Portland cement 17.7-18.4 Indicated sand 41.62-42.0 Specified crushed stone 32.8-33.0 Specified Additive 0.18-0.2 Water 7.0-7.1

The sol of iron (III) hydroxide in combination with polycarboxylates of various nature having side chains of different lengths contribute to the creation of a uniformly reinforced concrete structure, providing enhanced hydration processes in the entire volume of concrete and the sol of iron (III) hydroxide passes into the gel, contributing to the compaction of the structure concrete and, as a result, reduce its shrinkage by more than 3 times at the age of 120 days.

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 an iron (III) hydroxide sol with a density ρ = 1.021 g / cm ³ and a pH value of pH = 5.0 ± 0.5, and a plasticizer represented by a mixture of polycarboxylate polymers: a polycarboxylate polymer based on methacrylic acids with a density ρ = 0.95 g / cm ³ and pH = 7 ± 0.5, a polycarboxylate polymer based on allyl ether and maleic anhydrite with a density ρ = 1.03 g / cm ³ and pH 7 ± 0.5, namely, the hydration activity of cement increases uniformly throughout the volume of concrete and azuetsya further by switching sol of iron hydroxide (III) in an increased amount of gel gel filling the pores of the concrete is thus compacted concrete structure, which helps to reduce shrinkage of concrete.

According to the applicant and the authors, 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 buildings and structures for special purposes.

Concrete example

I. Preparation of Supplement

1.1. Preparation of sol of iron (III) hydroxide:

1.1.1. Dose a saturated solution of ferric chloride, FeCl ₃ .

1.1.2. Dose water.

1.1.3. Boil metered water.

1.1.4. The components prepared according to paragraph 1.1.1 are mixed. and paragraph 1.1.3., to obtain a solution of cherry-brown color, which is a sol with colloidal particles of iron hydroxide (III). The resulting sol of iron hydroxide should have a density ρ = 1,021 g / cm ³ and a pH of 5.0 ± 0.5.

1.2. The iron hydroxide sol prepared according to 1.1.4 is dosed.

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

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

1.5. Dose water.

2. Dispensed according to paragraphs 1.2, 1.3, 1.4 and 1.5. the components are thoroughly mixed to obtain a solution with a density ρ = 0.17 g / cm ³ and a pH of 6.5 ± 0.5.

3. The components of high-strength concrete are dosed: Portland cement, quartz sand with a fineness modulus Mkr = 2.7, granite crushed stone of a fraction 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. Dose the additive prepared according to claim 2.

3.4. The additive dosed according to paragraph 3.3. Is transported into dosed water.

3.5. The mixture prepared according to p. 3.4. Is transported to a concrete mixer.

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

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

3.8. The concrete mixture prepared according to clause 3.7 is taken directly from the concrete mixer. to control the physical and mechanical characteristics. The determination of concrete shrinkage is carried out according to GOST 24544-81.

Concrete shrinkage results are presented in the table. Studies have shown that shrinkage of concrete at the age of 120 days is reduced by 3.16 times.

Claims (1)

High-strength concrete obtained from a mixture containing Portland cement, sand, gravel, water and a complex additive contains quartz sand with a fineness modulus of Mkr. = 2.7 as sand, crushed stone of granite fractions of 5-10 mm and a complex additive with a density of 1.017 g / cm ³ and a pH of 6.5 ± 0.5, consisting of a sol of iron (III) hydroxide with a density ρ = 1.021 g / cm ³ and a pH of 5.0 ± 0.5 and a plasticizer, characterized in that as a plasticizer contains a mixture of polycarboxylate polymers: a polycarboxylate polymer based on methacrylic acid acids with a density ρ = 0.95 g / cm ³ and pH 7.0 ± 0.5, a polycarboxylate polymer based on allyl ether and maleic anhydrite with a density ρ = 1.03 g / cm ³ and pH 7.0 ± 0 , 5 and water in the following ratio of components, wt.%:
Methacrylic based polycarboxylate polymer acids with a density ρ = 0.95 g / cm ³ and pH = 7 ± 0.5 10.5-11.5 Allyl ether polycarboxylate polymer and maleic acid anhydrite with a density ρ = 1.03 g / cm ³ and pH = 7 ± 0.5 11.5-11.8 Iron (III) hydroxide sol with a density ρ = 1,021 g / cm ³ , a pH of pH 5.0 ± 0.5 8.0-8.5 Water 69.0-69.2
in the following ratio of components of the raw mix, wt.%:
Portland cement 17.7-18.4 Indicated sand 41.62-42.0 Specified crushed stone 32.8-33.0 Specified Additive 0.18-0.2 Water 7.0-7.1