RU-2861399-C1 - CONCRETE MIXTURE

Abstract

FIELD: building materials. SUBSTANCE: present invention can be used in the production of structures and products from concrete based on a cement binder for buildings and structures for civil, industrial and special purposes, for pouring foundations, self-levelling floors, and repair building mixtures. The concrete mixture contains Portland cement, quartz sand, water, and a strengthening additive, characterised in that shungite is used as the strengthening additive, fluoroalkylated with a compound R F OH, where R F can be (CF 2 CF 2 ) n , where n=1-3, in the following ratio of components, mas.%: Portland cement “ЦЕМ II/А-П” 42.5 22.5-23.0, medium-sized river sand, density 2.6 g/cm 3 , fineness modulus 1.8-2.0 67.2-68.0, water 9.0-9.5, strengthening additive as a percentage of Portland cement weight – 2.5-5.0. EFFECT: increase in compressive strength while maintaining other parameters of the concrete mixture. 1 cl, 2 tbl

Inventors

• Shreibert Nadezhda Aleksandrovna
• Vovko Vladimir Vladimirovich

Dates

Publication Date

20260505

Application Date

20251112

Claims (2)

1. A concrete mixture containing Portland cement, quartz sand, water and a strengthening additive, characterized in that the strengthening additive is shungite, fluoroalkylated with the compound R F OH, where R F is (CF 2 CF 2 ) n , where n = 1-3, with the following ratio of components, wt.%:
2. Portland cement CEM II/A-P 42.5 22.5-23.0 medium-sized river sand, density 2.6 g/ cm3 , fineness modulus 1.8-2.0, 67.5-68.0 water 9.0-9.5 strengthening additive in % of the mass of Portland cement over 100% 2.5-5.0

Description

The present invention relates to building materials and can be used in the production of structures and products made of concrete on a cement binder for buildings and structures for civil, industrial and special purposes, for pouring foundations, self-leveling floors, and repair building mixtures. A mixture for producing high-strength concrete is known, containing a complex additive consisting of the following components: a 20% solution of polycarboxylate polymer (CP-WRM) having a hydrogen index value of pH=6 and a density of 1.029 g/ cm3 , a high-molecular polymer compound with a molecular weight of more than 600 g/mol, a density of 0.98 g/ cm3 and a pH value of 6.5, a colloidal solution (sol) of silicic acid with a density of 1.014 g/ cm3 and a pH=3.5 [patent RU 2684264 C1, published on 04.04.2019]. A mixture for producing ultra-high-strength concrete with a low cement content is known, containing Portland cement, the particles of which have a D50 from 2 to 11 μm; microsilica; mineral additive A1, the particles of which have a D50 from 15 to 150 μm. Mineral additive A1 is selected from slags, pozzolanic additives or siliceous additives such as quartz, mineral additives of siliceous limestone, limestone additives such as calcium carbonate, or mixtures thereof [patent RU 2683295 C2, published 03/27/2019]. The disadvantages of the well-known mixture for producing ultra-high-strength concrete include its complex multi-component composition and the technology used to produce the material. High-strength fine-grained concrete is also known based on a composite binder using man-made quartzite sandstone raw material, containing: Portland cement, an active additive, a filler, an aggregate, a plasticizing additive, and water. Aluminous cement and microsilica are used as the active additive, the man-made quartzite sandstone raw material is used as the filler, quartz sand and crushed quartzite screenings are used as the aggregate, and the Melflux 2651 F hyperplasticizer and water are used as the plasticizing additive [patent RU 2627811 C1, published 11.08.2017]. The disadvantages include the complex multi-component composition of the mixture, the use of aluminous cement, and the labor-intensive technology of producing the composition. Shungite rocks are unique natural polymineral nanotechnological compounds containing an amorphous carbonaceous substance known as shungite material (SM). SM has an unusual structure, in that carbon exists in the form of a new modification—fullerene and fullerene-like forms. Highly dispersed crystalline silicates are uniformly distributed within this amorphous carbon matrix. The structural features of shungite determine its complex of specific characteristics: - high electrical conductivity - shielding properties (protection from electromagnetic radiation) - mechanical strength under compression - sorption capacity - antiseptic and biocidal action - clinically proven medicinal properties The chemical activity of shungite is due to the presence of mineral phases of varying polarity in its composition: - non-polar carbon phase - polar silicates - aluminosilicates - other mineral components Thanks to these properties, shungite effectively interacts with substances of both inorganic and organic nature, which allows it to be used as a filler or aggregate in composite concrete materials based on various binders. A dry composition based on shungite is known, which includes, by weight %: magnesite caustic powder - 20.3-32.2; brucite caustic powder - 8.7-13.8; polycarboxylate powder - 0.5-1.5; vinyl acetate/ethylene copolymer powder - 0.5-3.0; zinc stearate powder - 0.6-1.8; polydisperse shungite [patent RU 2540747 C1, published 10.02.2015]. The disadvantages of the well-known dry composition based on shungite are the complex multi-component composition and technology of obtaining the material, as well as a small increase in strength within 5-10%. The closest to the proposed concrete mixture was selected construction mixture for the production of paving slabs, which contains shungite filler of fraction 0.1-8 mm - 30-73.8 wt.%, Portland cement - not less than 20 wt.%, quartz sand - 0.1-43.9 wt.%, finely ground shungite powder with particle size from 0.1 to 63 μm - 2-5 wt.%, modifying additives LST or plasticizers - 0.1-0.5 wt.% of the weight of Portland cement, water - the rest [patent RU 2840005 C1, published on 15.05.2025]. The disadvantages of the closest analogue are the low physical and chemical properties of the resulting paving slabs. The objective of the present invention is to develop a concrete mixture composition modified with a strengthening additive. The technical result of the present invention consists in increasing the compressive strength while maintaining other properties of the concrete mixture. The technical result is achieved in that a concrete mixture containing Portland cement, quartz sand, water and a strengthening additive is distinguished in that shungite, fluoroalkylated