RU2247090C1 - Concrete mixture, additive for concrete mixture and cement modified with same additive (variants) - Google Patents

Abstract

FIELD: concrete composition, cement modified with additive and additive for concrete mixture.

SUBSTANCE: claimed additive contains silica component (e.g., tripoli or sodium methasilicate); superplasticizer; Lignopane with molecular weight of 10-50 kDa; air-entraining agent (e.g., neutralized air-entraining resin or wood saponificated resin) and additionally carboxymethyl cellulose. Additive is obtained by mixing of dry components in ratio (mass %): tripoli or sodium methasilicate (calculated as Si₂O) 20-25; neutralized air-entraining resin or wood saponificated resin 0.005-0.01; superplasticizer 0-20; Lignopane 10-11; carboxymethyl cellulose 1-8. Said additive content is 0.3-2.5 calculated as cement mass. Concrete mixture may comprise (kg/m³) cement 250-600; filler 1590-2030; water 105-190; coarse filler (chip and/or gravel of grade 5-20 mm or 5-40 mm) and/or fine filler (sand of fineness not more than 5 mm). As fine filler at least one component selected from group containing quartz sand, sand from igneous formation, sand from metamorphic formation, haydite sand, and sand from blast-furnace dross is used. As coarse filler at least one component selected from group containing chip from igneous formation, chip from metamorphic formation, chip from sediment, chip from blast-furnace dross, etc. is used. According to one embodiment modified cement is obtained by dry agitation with 0.3-2.5 mass % of above mentioned additives. According to other embodiment modified cement is obtained by simultaneous milling of Portland cement clinker, gypsum and additive of said composition in amount of 0.3-1.0 %. Composition of present invention is useful in building industry for production of monolith and precast concrete and reinforced concrete construction, etc.

EFFECT: concrete mixture of increased water impermeability, freeze resistance, and strength.

11 cl, 3 tbl

Description

The invention relates to compositions of concrete mixtures and additives for concrete mixtures and can find application in construction in the manufacture of monolithic and prefabricated concrete or reinforced concrete products and structures, in shotcrete masses, as well as in the oil industry in the manufacture of grouting and insulating cement materials.

Known concrete mixture containing Portland cement M 500, quartz sand, granite crushed stone, water and an additive - complex modifier containing, wt.%: Dispersed mineral component based on silicon dioxide from the group: rock, gas treatment product of furnaces smelting crystalline silicon and / or ferrosilicochrome, and / or silicocalcium, and / or burning coal, 51.9-94.1, salts of organic acids 4.7-45.5, and water - the rest.

A known additive for concrete mix is a complex modifier containing, wt.%: Dispersed mineral component based on silicon dioxide from the group: rock, gas treatment product of furnaces smelting crystalline silicon and / or ferrosilicochrome, and / or silicocalcium, and / or burning stone coal, 51.9-94.1, salts of organic acids 4.7-45.5, and water - the rest (RF patent No. 2160723, 20.12.2000).

The closest analogue to the claimed concrete mix is concrete mix, including cement, coarse and / or fine aggregate - crushed stone from igneous, metamorphic or sedimentary rocks, blast furnace slag or pumice slag, expanded clay gravel and / or sand, water and an additive containing mas .h .: silica fume or perlite, or diatomite, or tripoli 50-65, superplasticizer C-3 15-20, neutralized air-entraining START resin or hydrophobizing organosilicon powder 0.1-0.5, Lignopane with a molecular weight of 10-50 kDa 10 -12, with Erzhanov additives in the concrete mixture is 1-5% by weight of cement.

The closest analogue for the claimed additive is an additive for concrete mixture containing parts by weight of: silica fume or perlite, or diatomite, or tripoli 50-65, superplasticizer C-3 15-20, neutralized air-entraining START, or hydrophobizing silicone powder 0.1 -0.5, Lignopane with a molecular weight of 10-50 kDa 10-12 (RF patent No. 2177919, 01/10/2002).

The closest analogue for the cement declared according to the first embodiment is cement modified with an additive containing a siliceous component - amorphous silicon dioxide, C-3 superplasticizer (RF patent No. 2167114, 05.20.2001).

The closest analogue for the cement declared in the second embodiment is cement modified with an additive obtained by dry grinding of Portland cement clinker, gypsum and an additive of a siliceous component - tuff, quartz sand, feldspar sand, fly ash, ore dressing tailings, C-3 superplasticizer and sulfate sodium or potassium (RF patent No. 2029749, 02.27.1995).

The objective of the present invention is to increase the water resistance, frost resistance, strength.

This problem is solved by the fact that in a concrete mixture comprising cement, coarse and / or fine aggregate, water and an additive containing a siliceous component, S-3 superplasticizer, air-entraining additive, Lignopane with a molecular weight of 10-50 kDa, the specified additive as a siliceous the component contains tripoli or sodium metasilicate, as an air-entraining additive - neutralized air-entraining START resin or saponified wood tar, additionally - CMC carboxymethyl cellulose and mixing is prepared m of dry components in the following ratio, parts by weight:

Tripoli or sodium metasilicate in terms of SiO ₂ 20-25

superplasticizer S-3 0-20

specified Lignopan 10-11

START or LMS 0.005-0.01

CMC 1-8,

and the content of the additive is 0.3-2.5 wt.% by weight of cement. Moreover, the concrete mixture may contain these components in the following ratio, kg / m ³ : cement 250-600, aggregate 1590-2030, water 105-190, aggregate coarse and / or fine, as aggregate coarse gravel and / or gravel, aggregate coarse fractions of 5-20 or 5-40 mm, as a fine aggregate - sand with a grain size of not more than 5 mm, as a fine aggregate - at least one component from the group: quartz sand, sand from igneous rocks, sand from metamorphic mountain rocks, expanded clay sand, sand from blast furnace slag, as TBE large aggregate - of at least one component from the group: crushed eruptive rocks, rubble from metamorphic rocks, rubble from sedimentary rocks, rubble from blast furnace slag, expanded clay gravel, crushed stone of slag pumice.

This problem is also solved by the fact that in cement modified with an additive containing a siliceous component and C-3 superplasticizer, this additive contains tripoli or sodium metasilicate as a siliceous component and additionally Lignopane with a molecular weight of 10-50 kDa, a neutralized air-entraining START or saponified wood-based resin and CMC carboxymethyl cellulose, and cement obtained by dry mixing with 0.3-2.5 wt.% of its weight of the specified additives in the following ratio of its components, parts by weight:

Tripoli or sodium metasilicate in terms of SiO ₂ 20-25

superplasticizer S-3 0-20

specified Lignopan 10-11

START or LMS 0.005-0.01

CMC 1-8

This problem is also solved by the fact that according to the second variant, in cement modified with an additive obtained by joint dry grinding of Portland cement clinker, gypsum and an additive containing a siliceous component and C-3 superplasticizer, this additive contains tripoli or sodium metasilicate as a siliceous component and additionally - Lignopane with a molecular weight of 10-50 kDa, a neutralized air-entraining START resin or wood-saponified resin SDO and CMC carboxymethyl cellulose in the following ratio of entov, parts by weight:

Tripoli or sodium metasilicate in terms of SiO ₂ 20-25

superplasticizer S-3 0-20

specified Lignopan 10-11

START or LMS 0.005-0.01

CMC 1-8,

and the content of the additive is 0.3-1.0 wt.% by weight of cement.

This problem is also solved by the fact that the concrete mixture additive containing a siliceous component, S-3 superplasticizer, an air-entraining additive, Lignopan with a molecular weight of 10-50 kDa, contains tripoli or sodium metasilicate as a siliceous component, and a neutralized airborne resin as an air-entraining additive START or saponified wood tar, and additionally CMC carboxymethyl cellulose and prepared by mixing dry components in the following ratio, parts by weight:

Tripoli or sodium metasilicate in terms of SiO ₂ 20-25

superplasticizer S-3 0-20

specified Lignopan 10-11

START or LMS 0.005-0.01

CMC 1-8

In concrete mix can be used:

Astringent - Portland cement, pozzolanic portland cement, slag Portland cement, quick-setting Portland cement, alumina cement in an amount of 250-600 kg / m ³ ;

Coarse aggregate of fractions 5-10 mm or 5-20 mm, or 5-40 mm, at least one component from the group including: crushed stone from igneous rocks, from metamorphic rocks, from sedimentary rocks, from dump or granulated slag , slag pumice, expanded clay gravel;

Fine aggregate of a fraction of not more than 5 mm is at least one component from the group comprising: quartz sand, quartz-feldspar sand, limestone sand, sand from igneous or metamorphic rocks, from blast furnace slag, expanded clay sand.

The total content of aggregate in the composition of the concrete mixture is 1500-2030 kg / m ³ ;

Water in an amount of 105-190 kg / m ³ .

The ratio of the components in the composition of the concrete mix can vary widely depending on the required grade of concrete and the method of molding products used.

To prepare the additive, use:

Tripoli Vurnarsky field

Lignopan - lignosulfonates modified with electrolytes with a molecular weight of 10-50 kDa according to TU 2601-002-20127879-96

Neutralized air-entraining START resin according to TU 810575-74

Saponified wood resin SDO

Superplasticizer S-3 according to TU 6-36-0204229-625-90

Carboxymethyl cellulose

Sodium Metasilicate - Crystalline Powder

The additive is prepared by mixing the above dry components.

The compositions of the additives are shown in table 1.

Table 1 Components content by weight 1 2 3 4 Tripoli (in terms of SiO ₂ ) twenty 25 sodium metasilicate (in - 25 twenty - in terms of SiO ₂ ) START 0.006 0.01 0.008 FROM TO - - 0.007 - S-3 10 5 - twenty Lignopan 10 eleven eleven 10 kmts 4 1 8 6

The additive is used in an amount of 0.3-2.5% by weight of cement.

The test results of cement modified with the additive are shown in table 2.

The composition of the concrete mixture and the properties of concrete with the specified additive are shown in table 3.

The test results presented indicate the high efficiency of the additive, the use of which in concrete allows to obtain plasticized concrete with high physical and mechanical characteristics, including with increased water resistance, strength and frost resistance.

Test results of cement modified with Biotech-NM additive. Mikhailovsky PC 400 D20 cement was used.

table 2 No. p / p the content of the additive, wt.% from cement Compression strength at the age of 28 days MPA 1 0 32.1 2 0.5 41,4 3 0.5 44.7 4 1,0 47.5 5 1,0 50.3 6 1,5 54.7 7 1,5 54.8 8 2.0 59.9 nine 2,5 64.8 Note:
In examples 2,4,6,9 used cement obtained by mixing with the additive “Biotech-NM”

In examples 3, 5, 7, cement was used, obtained by joint grinding of clinker with the addition of “Biotech-NM”. In examples 2.5, we used an additive of Biotech-NM composition 1, shown in table 1. In examples 3, 4 we used an additive of Biotech-NM composition 2, shown in table 1. In examples 6, 7, we used an additive of Biotech-NM composition 3, shown in table 1. In examples 8.9 used the additive Biotech-NM composition 4, are shown in table 1.

Claims (11)

1. A concrete mixture comprising cement, aggregate, water and an additive containing a siliceous component, a C-3 superplasticizer, an air-entraining additive, Lignopane with a molecular weight of 10-50 kDa, characterized in that the additive contains tripoli or sodium metasilicate as a siliceous component, as an air-entraining additive - neutralized air-entraining START resin or saponified wood-based resin, additionally CMC carboxymethyl cellulose and prepared by mixing dry components in the following ratio SRI, in parts by weight .: Tripoli or sodium metasilicate in terms of SiO ₂ 20-25 Superplasticizer S-3 0-20 Specified Lignopan 10-11 START or LMS 0.005-0.01 CMC 1-8 moreover, the content of the additive is 0.3 to 2.5 wt.% from cement. 2. The concrete mixture according to claim 1, characterized in that it contains cement, aggregate and water in the following ratio, kg / m: Cement 250-600 Placeholder 1590-2030 Water 105-190 3. The concrete mixture according to claim 1 or 2, characterized in that it contains a large and / or small aggregate. 4. Concrete mixture according to any one of claims 1 to 3, characterized in that it contains coarse gravel and / or gravel as an aggregate. 5. The concrete mixture according to claim 3 or 4, characterized in that it contains a coarse aggregate fraction 5-20 or 5-40 mm 6. Concrete mixture according to any one of claims 3 to 5, characterized in that it contains fine sand with a particle size of not more than 5 mm as aggregate. 7. Concrete mixture according to any one of claims 3 to 6, characterized in that it contains at least one component from the group as fine aggregate: quartz sand, sand from igneous rocks, sand from metamorphic rocks, expanded clay sand sand from blast furnace slag. 8. Concrete mixture according to any one of claims 3 to 7, characterized in that it contains a large aggregate of at least one component from the group: crushed stone from igneous rocks, crushed stone from metamorphic rocks, crushed stone from sedimentary rocks , crushed stone from blast furnace slag, expanded clay gravel, crushed stone from slag pumice. 9. Cement modified with an additive containing a siliceous component and C-3 superplasticizer, characterized in that the additive contains tripoli or sodium metasilicate as a siliceous component and, additionally, Lignopane with a molecular weight of 10-50 kDa, an air-entraining neutralized START resin or wood resin saponified SDO, CMC carboxymethyl cellulose and obtained by dry mixing with 0.3-2.5 wt.% of its weight of the specified additives in the following ratio of its components, wt.%: Tripoli or sodium metasilicate in terms of SiO ₂ 20-25 Superplasticizer S-3 0-20 Specified Lignopan 10-11 START or LMS 0.005-0.01 CMC 1-8 10. Cement modified by the additive obtained by co-dry grinding of Portland cement clinker, gypsum and an additive containing a siliceous component and C-3 superplasticizer, characterized in that the additive contains tripoli or sodium metasilicate as a siliceous component and additionally Lignopane with a molecular weight of 10 -50 kDa, neutralized air-entraining START resin or wood-saponified resin SDO, CMC carboxymethyl cellulose in the following ratio, wt.%: Tripoli or sodium metasilicate in terms of SiO ₂ 20-25 Superplasticizer S-3 0-20 Specified Lignopan 10-11 START or LMS 0.005-0.01 CMC 1-8 moreover, the content of the additive is 0.3-1.0 wt.% by weight of cement. 11. Additive for concrete mixture containing a siliceous component, C-3 superplasticizer, air-entraining additive, Lignopan with a molecular weight of 10-50 kDa, characterized in that it contains tripoli or sodium metasilicate powder as a siliceous component, neutralized resin as an air-entraining additive saponified air or wood resin and optionally CMC carboxymethyl cellulose and prepared by mixing dry components in the following ratio, wt.h .: Tripoli or sodium metasilicate in terms of SiO ₂ 20-25 Superplasticizer S-3 0-20 Specified Lignopan 10-11 START or LMS 0.005-0.01 CMC 1-8 moreover, the content of the additive is 0.3-2.5 wt.% from cement.