RU2515250C1 - High-strength concrete - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: high-strength concrete produced from a raw mix containing portland cement, sand, crushed stone and water and a complex additive containing sol of berlin blue with density equal to 1.013 g/cm³, hydrogen index 4.7-5.3 and plasticiser SikaAer 200S at the following ratio of components, wt %: 16.50-17.00 and 83.00-83.50 and accordingly, at the following ratio of components of a raw mix, wt %: portland cement 24.30-31.70; sand 23.60-26.00; crushed stone 36.40-39.60; specified additive 0.60-0.80; water 7.70-9.30.

EFFECT: increased frost resistance of concrete.

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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 low value of frost resistance of concrete.

Known raw material mixture for the manufacture of high-strength concrete (RU No. 2256629, С04В 28/04, published on 07.20.2005), containing: Portland cement, sand, gravel, silica-containing component, represented by orthosilicic acid sol with a density of 1.014 g / cm ³ , hydrogen indicator 5-6, the addition of "DEYA-M" and water.

The disadvantage of this technical solution is the low value of frost resistance of concrete.

The closest in technical essence to the claimed invention is high-strength concrete (RU No. 2433098, С04В 28/04, 22/06, 24/24, 111/20, publ. 10.11.2011), containing: Portland cement, sand, gravel, additive and water, the additive is complex and consists of sol of Prussian blue with a density of 1.013 g / cm ³ , a hydrogen index of 4.7-5.3 and a Peramin SMF-10 hyperplasticizer based on polycarboxylic polymers of the Swedish company Perstorp (compatible with specifications ASTM C494 type F, DIN 1045, BS 5075 parts 1 and 3, EN 934-2) with the following ratio of components, wt.%:

Sol of Prussian Blue, characterized by density 1.013 g / cm ³ hydrogen indicator 4.7-5.3 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 22.40-28.30 Sand 23.60-26.00 Crushed stone 36.40-39.60 Specified Additive 0.06-0.08 Water 11.64-11.92

The disadvantage of this technical solution is the limited value of frost resistance of concrete.

The problem to which the invention is directed, is the creation of high-strength concrete with high frost resistance.

The technical result is achieved by the fact that high-strength concrete contains Portland cement, sand, gravel, water and a complex additive consisting of sol of Prussian blue with a density equal to 1.013 g / cm ³ , a hydrogen index of 4.7-5.3 and a plasticizer, characterized in that as a plasticizer contains SikaAer 200S, in the following ratio, wt.%:

Sol of Prussian Blue, characterized by density 1.013 g / cm ³ hydrogen indicator 4.7-5.3 16.50-17.00 SikaAer 200S supplement 83.00-83.50

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

Portland cement 24.30-31.70 Sand 23.60-26.00 Crushed stone 36.40-39.60 Specified Additive 0.60-0.80 Water 7.70-9.30

Sol of Prussian blue will increase the hydration activity of cement, due to the introduction of a structural element characterized by increased internal and external surface energy, resulting in the formation of tobermorite-like hydrosilicates d / n = 3.07; 2.80; 1.83 and hydrosilicates represented by hillebrandite d / n = 12.60; 3.34; 2.92, which have a layered and fibrous structure. By reducing the amount of chemically unbound water in concrete by using this complex additive, the density of the artificial stone is increased, and the increased number of hydrated neoplasms formed will contribute to the compaction of the stone structure and, as a result, increase the frost resistance of concrete.

Sol of Prussian blue in combination with SikaAer-200S additive allows to obtain high-strength concrete with increased frost resistance compared to the prototype.

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 additive is a red liquid with a density of 1.00-1.02 g / cm ³ , with a hydrogen index of 8.0-9.0. The chemical basis of the additive “SikaAer-200S” is a concentrated solution of synthetic resins (according to the passport of the manufacturer LLC “Zika”, a structural unit of the Swiss concern Sika).

SikaAer-200S additive is not allowed to be dosed with other additives simultaneously through one dispenser. The type of cement and the grain composition of the aggregate, the temperature of the concrete mixture, as well as the quality of mixing, primarily affects the effectiveness of the additive.

The claimed combination of essential features exhibits a new property in the presence of the specified complex additives, namely, it increases the frost resistance of the material by 21% to a value of 850 cycles compared to the prototype.

The mixture, including Portland cement, sand, crushed stone and the additive, represented by Prussian blue sol with a density of 1.013 g / cm ³ , a hydrogen index of 4.7-5.3 and SikaAer-200S additive, provided high-strength concrete, characterized by an increased value of frost resistance.

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 and industrial engineering, as well as in the construction of structures for special purposes.

The raw mix is prepared in the following sequence: a sol of Prussian blue is obtained, characterized by a density of 1.013 g / cm ³ , a hydrogen index of 4.7-5.3 - 0.1 cm ^{3 of} a cold-saturated solution of iron chloride, is introduced into 100 cm ^{3 of} water. In a diluted solution, 1 drop of a 20% solution of potassium ferruginous is added with stirring. Blue sol of blue azure (chloride of iron (III) hexocyanoferrate) is formed.

Thus, sol of Prussian blue is obtained (chloride of iron (III) hexocyanoferrate) (N.V. Korovin "General Chemistry", M., "Higher School", 2000. - 558 p.).

Dosage sol of Prussian blue and SikaAer-200S are placed in dosed water. Dispensed components of the raw mix: Portland cement M400 D20, sand with a particle size module of 2.1, crushed stone fractions of 5-10 mm and water containing a dosed complex additive is placed in a concrete mixer, where the components are mixed and the concrete mix is prepared, from which the required concrete products are made and samples for quality control in terms of frost resistance.

Concrete hardening was carried out under normal conditions and the test results, according to GOST 10060.0-95 "Methods for determining frost resistance" are presented in the table.

Analysis of the data presented in the table shows that the proposed high-strength concrete according to this invention is characterized by increased frost resistance of the material by 21% to a value of 850 cycles compared to the prototype.

Claims (1)

High-strength concrete obtained from a mixture containing Portland cement, sand, crushed stone, water and a complex additive consisting of sol of Prussian blue with a density equal to 1.013 g / cm ³ , a hydrogen index of 4.7-5.3 and a plasticizer, characterized in that as a plasticizer contains SikaAer 200S, in the following ratio, wt.%:
Sol of Prussian Blue, characterized by density 1.013 g / cm ³ hydrogen indicator 4.7-5.3 16.50-17.00 SikaAer 200S supplement 83.00-83.50
in the following ratio of components of the raw mix, wt.%:
Portland cement 24.30-31.70 Sand 23.60-26.00 Crushed stone 36.40-39.60 Specified Additive 0.60-0.80 Water 7.70-9.30