RU2489381C2 - Crude mixture for high-strength concrete with nanodispersed additive (versions) - Google Patents

Crude mixture for high-strength concrete with nanodispersed additive (versions) Download PDF

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RU2489381C2
RU2489381C2 RU2011125430/03A RU2011125430A RU2489381C2 RU 2489381 C2 RU2489381 C2 RU 2489381C2 RU 2011125430/03 A RU2011125430/03 A RU 2011125430/03A RU 2011125430 A RU2011125430 A RU 2011125430A RU 2489381 C2 RU2489381 C2 RU 2489381C2
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water
additive
vnv
concrete
nanodispersed
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RU2011125430A (en
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Лариса Алексеевна Урханова
Солбон Александрович Лхасаранов
Эрдэм Гармаевич Дамдинов
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Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Восточно-Сибирский государственный университет технологий и управления"
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Abstract

FIELD: chemistry.
SUBSTANCE: invention relates to the industry of construction materials and can be used to make concrete articles in civil and industrial construction, as well as in nanotechnology. The crude mixture for high-strength concrete with a nanodispersed additive, which contains binder, quartz-feldspar sand with fineness modulus of 2.1, granite screenings with particle size of 2.5-5 mm, an additive and water, the additive being nanodispersed silicon dioxide powder Tarcosil-05, which is subjected to ultrasonic pretreatment in a disperser UZDN-A with hardening water, the binder being a low water demand binder VNV-100, with the following ratio of components, wt %: VNV-100 26.3-26.66, quartz-feldspar sand with fineness modulus of 2.1 32.88-33.2, granite screenings with particle size of 2.5-5 mm 32.88-33.2, nanodispersed silicon dioxide powder Tarcosil-05 0.013-0.052, water 6.888-7.927. In another version, the crude mixture contains low water demand binder VNV-100 with pearlite as filler, with the corresponding adjustment of the ratio of components of the crude mixture.
EFFECT: high compression and bending strength at the design phase and low water absorption, low cement consumption.
4 tbl

Description

The invention relates to the building materials industry and can be used for the manufacture of concrete products in civil and industrial construction, including using nanotechnology.
A known raw material mixture for the manufacture of high-strength fine-grained concrete containing Portland cement, screening crushing quartzite sand and water (see Glagolev E.S. High-strength concrete on composite binders and industrial sand for monolithic construction: Abstract of the dissertation for the academic university of technical science . - Belgorod: Publishing House of BSTU named after Shukhov, 2010-20 p.).
A disadvantage of the known composition of the raw mix is insufficient compressive strength of fine-grained concrete.
The closest in technical essence to the claimed invention is high-strength concrete, including Portland cement, sand, granite screenings fr. 2.5-5 mm, a silica-containing component represented by H 2 SiO 3 sol with a density ρ = 1.014 g / cm 3 , pH 5 ... 6, and water in the following ratio of components, wt.%:
Portland cement 20.8-25.0
Sand 24.0-25.6
Granite screenings fr. 2.5-5 mm 42.45-45.55
Additive - silica-containing
component represented by sol
H 2 SiO 3 with a density ρ = 1.014 g / cm 3 ,
pH 5 ... 6 0.75
Water 7.30-7.8
(see Komokhov PG, Sol-gel as a concept of nanotechnology of a cement composite // Building materials. - 2006. - No. 9. - p. 89-90).
The disadvantage of the composition of the raw mix for obtaining high-strength concrete is the limited maximum value of compressive strength, as well as the increased value of water absorption of concrete.
The problem to which the invention is directed, is the creation of high-strength concrete with improved construction, technical and operational properties based on composite binders - binders of low water demand (VNV).
The technical result of the invention is to increase the compressive and bending strength at the design age, reduce cement consumption due to the use of perlite in the composition of VNV-70 - up to 30%.
The technical result is achieved by the fact that the raw material mixture for high-strength concrete with a nano-dispersed additive, including binder, quartz-feldspar sand with a particle size module of 2.1, granite screenings of a fraction of 2.5-5 mm, the additive and water, according to the invention, contains nanosized dioxide powder as an additive silicon Tarkosil-05, which is pre-subjected to ultrasonic treatment together with mixing water in an ultrasonic disperser UZDN-A for 10 minutes, and as a binder contains a binder of low water demand B-100 in the following ratio, wt.%:
VNV-100 26.3-26.66
Quartz feldspar sand
with particle size 2.1 32.88-33.2
Granite screenings fr. 2.5-5 mm 32.88-33.2
Nanodispersed powder
silica tarcosil-05 0.013-0.052
Water 6,888-7,927
The technical result is also achieved by the fact that the raw material mixture for high-strength concrete with a nano-dispersed additive, including binder, quartz-feldspar sand with a fineness modulus of 2.1, granite screenings of a fraction of 2.5-5 mm, the admixture and water, according to the invention, as an additive contains nano-dispersed powder of silica Tarkosil-05, which is preliminarily subjected to ultrasonic treatment together with mixing water in an ultrasonic disperser UZDN-A for 10 minutes, and as a binder contains a binder of low water consumption awn VNV-70 in the following ratio of components, wt.%:
VNV-100 26.26-26.6
Quartz feldspar sand
with particle size 2.1 32.8-33.1
Granite screenings fr. 2.5-5 mm 32.8-33.1
Nanodispersed powder
silica tarcosil-05 0.013-0.052
Water 7,248-8,127,
in addition, perlite is used as a filler in the composition of VNV-70.
The creation of high-strength concrete with a nanodispersed additive with improved construction, technical and operational properties provides for the use of VNV as binders using perlite rocks of the Mukhor-Talinsky deposit of the Republic of Buryatia. VNV is obtained by joint grinding in a ball mill to a specific surface of 450-550 m 2 / kg of Portland cement and an organic water-lowering reagent based on naphthalenesulfonic acid with formaldehyde - superplasticizer SP-1 (1-2 wt.%) For VNV-100, Portland cement, mineral filler in in the form of a siliceous material - perlite in an amount of 30% and superplasticizer SP-1 (1-2 wt.%) for VNV-70.
The present invention provides for the reduction of water consumption for concrete production through the use of an organic water-lowering reagent in the composition of binders, the production of VNW, improving the rheological characteristics of concrete mixtures, increasing the mobility of a concrete mixture by introducing a modifier-nanodispersed powder of silicon dioxide Tarkosil-05 and an organic water-reducing reagent, reduction of consumption of concrete modifier, reduction of consumption of an expensive component of concrete mix - cement by replacing it with 30% effusive rocks of aluminosilicate composition - perlite rocks, increase in strength indicators, including in the initial stages of hardening, decrease in water absorption of concrete.
Concrete mixtures using VNV-100, VNV-70 are characterized by increased viscosity at rest and significant thixotropic dilution under mechanical stresses, which determine their high compaction and low energy consumption for the molding process, high uniformity, non-separability, water-holding ability during transportation, laying and compaction . The rate of curing of concrete is high in intensity. Cement stone and concrete on VIV are characterized by low porosity with almost no large capillary pores.
A distinctive feature of the proposed mixture for high-strength concrete is the use of Tarkosil-05 nanosized powder of silicon dioxide as a modifying additive for concrete, which increases the mobility of the cement paste, as well as the concrete mixture, and its initial shelf life, reduces the setting time of cement, and also as component of VNV-70 - perlite. It was experimentally established that, depending on the concentration of the additive, the effect of increasing plasticity at the initial moment after the completion of mixing is 50% and reaches a maximum of 80% after 150 minutes, and depending on the content of perlite and superplasticizer SP-1, the strength of VNV is within 53-90 MPa.
A new modifying additive - nanosized powder of silicon dioxide Tarkosil-05 obtained by the method (see patent RU No. 2067077, IPC 7 СВВ 33/18, publ. In bull. No. 27, 1996) with an average primary particle size of about 53 nm, s specific surface area 50.6 m 2 / g (according to the Sorbi-M specific surface measuring device).
Nanodispersed powder of silica Tarkosil-05 consists of more than 99% of amorphous silica, the content of impurities, in wt.%: Al 0.01, Fe 0.01, Ti 0.03.
When using a siliceous material — crystalline and crystallized perlite — as a mineral additive in the composition of VNV, the problem of increasing the strength and density of the structure of concrete from such cement is solved. This is ensured by the binding of calcium hydroxide Ca (OH) 2 , released during the dissolution of cement silicate minerals, amorphized silica SiO 2 siliceous mineral material and additives from nanosized powder of silicon dioxide Tarkosil-05 with the formation of strong tobermorite-like crystalline hydrates of the form CSH (I), which provides high concrete strength.
The proposed raw mix for high-strength concrete with nanodispersed additive contains components in the following ratio, wt.%: VNV-100 (VNV-70) 26.3-26.66 (26.26-26.5), quartz feldspar sand with a particle size module 2 , 1 32.88-33.2 (32.8-33.1), granite screenings fr. 2.5-5 mm 32.88 - 33.2 (32.8-33.1), nanosized powder of silica Tarkosil-05 0.013-0.052 (0.013-0.052), water 6.888-7.927 (7.248-8.127). It was experimentally established that just such a composition of the raw mix for high-strength concrete with nanodispersed admixture ensures the achievement of a technical result consisting in increasing the mobility of the concrete mixture by 20-25%, reducing water consumption by an average of 15-20%, and also in increasing the strength characteristics in by an average of 27-36% and a decrease in water absorption by an average of 50-55% compared with the control non-additive composition of concrete based on VNV-100 and VNV-70.
Introduction to the composition of the raw mix for high-strength concrete, a new modifying additive - nanosized powder of silicon dioxide Tarkosil-05 allows you to adjust the microstructure of the hardening stone and, accordingly, its physical and mechanical properties. It was experimentally established that when a nanocispersed powder of silicon dioxide Tarkosil-05 is introduced into the composition of the raw mix for high-strength concrete less than 0.013%, a slight increase in strength indicators is observed compared to the control non-additive composition on Portland cement, and the introduction of nanodispersed powder of silicon dioxide more than 0.052% is impractical, since it leads to a rise in price of the final cost of the finished product - concrete. At the same time, it was established by experimental studies that the introduction of a new modifying additive, Tarkosil-05 nanodispersed silicon dioxide powder in the indicated interval, allows one to obtain compressive strength parameters exceeding the average strength of non-additive control concrete by 25-36%.
Experimental studies have shown that a quantitative change in the ratio of the components of the raw mix to obtain high-strength concrete with nanodispersed additive (wt.%): VNV-100 (VNV-70) 26.3-26.66 (26.26-26.5), quartz feldspar sand with a particle size modulus of 2.1 32.88-33.2 (32.8-33.1), granite screenings fr. 2.5-5 mm 32.88 - 33.2 (32.8-33.1), nanosized powder of silica Tarkosil-05 0.013-0.052 (0.013-0.052), water 6.888-7.927 (7.248-8.127) allows you to vary concrete composition without a tangible change in strength indicators and water absorption.
The components of the raw mix for the production of high-strength concrete with a nanodispersed additive are selected so that the samples obtained have the maximum strength characteristics.
To obtain the proposed raw material mixture for high-strength concrete with nanodispersed additives, Portland cement M400 DO LLC Timlyui Cement Plant, perlite of the Mukhor-Talinsky deposit (Republic of Buryatia) with a glass phase content of 60-80%, quartz-feldspar sand (quartz content of 65.6 wt. %, feldspars 27.4 wt.%) with fineness modulus MKR = 2.1, granite screenings of Gornyak OJSC, fractions 2.5-5 mm, condensation product of naphthalenesulfonic acid with formaldehyde - superplasticizer SP-1 TU 6-36 -0204229-625.
The chemical composition of the materials is presented in table 1.
Table 1
The chemical composition of raw materials
Material / Oxides SiO 2 Al 2 O 3 Cao Fe 2 O 3 MgO K 2 O Na 2 O FeO SO 3 ppp
Portland cement 20.7 4.81 63.73 4.44 1.65 0.36 0.40 - 2.90 1.01
Perlite 71,4 12.1 0.52 0.77 0.37 3.21 5.2 0.56 - 5.87
Quartz-feldspar sand with Micr. = 2.1 74.54 13.45 2,5 1.66 0.64 6.21 - 0.15 1.66
Six mixtures are prepared: three mixtures of components, wt.%: VNV-100 26.3-26.66, quartz feldspar sand with a fineness modulus of 2.1 32.88-33.2, granite screenings of a fraction of 2.5-5 mm 32, 88-33.2, nanosized powder of silicon dioxide Tarkosil-05 0.013-0.052, water 6.888-7.927 (compositions 1-3, table 2); three component mixtures, wt.%: VNV-70 26.26-26.5, quartz feldspar sand with a fineness modulus of 2.1 32.8-33.1, granite screenings of a fraction of 2.5-5 mm 32.8-33, 1, nanosized powder of silicon dioxide Tarkosil-05 0,013-0,052, water 7,248-8,127 (compositions 4-6, table 2). At the same time, control non-additive concrete compositions are prepared on the basis of VNV-100 and VNV-70 (compositions 7, 8, Table 2). In addition, two known concrete compositions are prepared using Portland cement, sand and H 2 SiO 3 sol with a density of ρ = 1.014 g / cm 3 and a pH of 5 ... 6, wt.%: 20.8-25; 24.0-25.6; 42.45-45.55 and 0.75, respectively (compositions 9 and 10 of the prototype, table 2).
Mixtures for formulations 1-6 are prepared as follows. The modifying additive is Tarkosil-05 nanodispersed silicon dioxide powder obtained on an electron accelerator with an average primary particle size of about 53 nm, with a specific surface area of 50.6 m 2 / g (according to the Sorbi-M specific surface measuring device), ultrasonic treatment in an ultrasonic disperser UZDN-A for 10 minutes together with mixing water. Portland cement, perlite and superplasticizer SP-1 are crushed together in a laboratory ball mill to a specific surface of 450-550 m 2 / kg in the following ratio of components, wt.%: Portland cement - 100; 70, perlite - 30, superplasticizer SP-1 - 1-2. The obtained binders of low water demand VNV-100 and VNV-70 are mixed with aggregates - quartz-feldspar sand with a fineness modulus of Mkr = 2.1 and granite screenings of the 2.5-5 mm fraction, add an aqueous suspension containing a modifying additive - nanosized powder of silicon dioxide Tarcosil -05, with a water-cement ratio of 0.26-0.31, mix thoroughly for 4-5 minutes, then prism samples are formed from the resulting concrete mixture of the same mobility 40 × 40 × 160 mm in size.
Figure 00000001
Similarly, samples are prepared from control mixtures according to compositions 7, 8: binders VNV-100, VNV-70 are mixed with aggregates - quartz-feldspar sand with a fineness modulus of Mkr. = 2.1 and granite screenings of a fraction of 2.5-5 mm, water is added to a water-cement ratio of 0.30-0.31, mix thoroughly for 4-5 minutes, then prism samples are formed from the resulting concrete mixture of the same mobility 40 × 40 × 160 mm in size. Samples harden under normal conditions at t = 20 ± 2 ° C and humidity 95-98% in the hydraulic bath of the shutter.
The tests are carried out according to standard methods and for each type of test samples are made in accordance with the requirements of GOST 10181.1-81 “Concrete mixtures. Methods for determining workability ", GOST 10180-90 (ST SEV 3978-83)" Concretes. Methods for determining the strength of control samples ”, GOST 12730.3-78“ Concretes. The method of determining water absorption. ”The known compositions (9, 10 according to the prototype) are prepared as follows: from distilled water and liquid glass Na 2 SiO 3 with a density ρ = 1.46 g / cm 3 , pH 11, prepare a solution with a ratio of Na 2 SiO 3 : H 2 O = 1: 20. Dosage materials are placed in a glass container and stirred until a homogeneous solution with ρ = 1.014 g / cm 3 , pH 10 is obtained. A solution of Na 2 SiO 3 with ρ = 1.014 g / cm 3 , pH 10 is passed through a cationite column and a sol of H 2 is obtained SiO 3 with a density ρ = 1.014 g / cm 3 pH 5 ... 6, which is a silica-containing component. The dosed silica-containing component is placed in dosed water. Dispersed components of the raw material mixture: Portland cement M400, quartz feldspar sand with a fineness modulus of Mkr. = 2.1, granite screenings of stone crushing fr. 2.5-5 mm and water containing a silica-containing component are mixed, then prism samples of the same mobility 40 × 40 × 160 mm in size are formed. Samples harden under normal conditions at t = 20 ± 2 ° C and humidity 95-98%. The test samples are tested for strength after 3 and 28 days.
Table 3 presents the physical and mechanical characteristics of compositions 1-10 of the investigated concrete.
Table 3
Composition No. The limit of compressive strength, MPa Water absorption, wt.%
after 3 days after 28 days
one 40 61 2.6
2 49 74 1.42
3 60 90 1.21
four 35 53 3.8
5 41 62 2,5
6 54 81 1.25
7 37 49 4,5
8 44 59 3.78
9 63 76 2,5
10 51 62 2.6
Analysis of the results (table 3) allows us to draw the following conclusions:
- the strength of high-strength concrete using a modifying additive - nanosized powder of silicon dioxide Tarkosil-05 lies in the range of 53-90 MPa after 28 days of normal hardening, which exceeds the strength of concrete without additives by an average of 60-62% and lowers water absorption by an average of 60 -65%, and also exceeds the strength of concrete based on VNV-100 and VNV-70 by an average of 27-36% and lowers water absorption by an average of 50-55%;
- the consumption of additives - concrete modifier - nanosized powder of silicon dioxide Tarkosil-05 is 5-10 times less than the introduction of a silica-containing component in the concrete, represented by H 2 SiO 3 sol;
- the use of obtained binders of low water demand (VNV) allows you to save up to 30% of Portland cement without reducing the strength indicators compared to concrete based on Portland cement;
- increase in strength is associated with a decrease in water consumption for concrete with the same mobility due to the use of an organic water-reducing reagent, acceleration of the pozzolanic reaction and the formation of a large number of calcium hydrosilicates (HSC), mainly low-basic type CSH (I), which leads to accelerated hardening and increased strength ;
- the optimum water-cement ratio for obtaining a mixture for high-strength concrete is in the range 0.26-0.31 based on the use of VNV and using Tarkosil-05 nanosized powder of silicon dioxide (without the use of Tarkosil-05 nanodispersed silicon dioxide, the water-cement ratio is within 0 , 33-0.40), which allows to obtain the optimal physical and mechanical properties of concrete.
The proposed raw mix to obtain high-strength concrete with nanodispersed additive is prepared as follows.
The dosed nanosized powder of silicon dioxide Tarkosil-05 obtained on an electron accelerator with an average primary particle size of about 53 nm, with a specific surface area of 50.6 m 2 / g, is placed in dosed water. In order to better disperse agglomerates of silicon dioxide nanoparticles in water, the components are subjected to ultrasonic treatment in an ultrasonic disperser UZDN-A for 10 minutes together with mixing water. Dispersed components of the raw material mixture: binder-VNV-100 (VNV-70) 26.3-26.66 wt.% (26.26-26.5 wt.%) Are mixed with aggregates - quartz-feldspar sand with a fineness modulus of Mkr. = 2 , 1 in an amount of 32.88-33.2 wt.% (32.8-33.1 wt.%) And granite screenings of a fraction of 2.5-5 mm in an amount of 32.88-33.2 wt.% (32 , 8-33.1 wt.%), Add an aqueous suspension containing an additive - nanosized powder of silicon dioxide Tarkosil-05 in an amount of 0.013-0.052 wt.% (0.013-0.052 wt.%), Add water in an amount of 6.888-7.927 wt. % (7.248-8.127 wt.%), With a water-cement ratio of 0.26-0.30 (0.27-0.31), placed in a concrete mixer , The components are mixed thoroughly for 4-5 minutes, then from the resulting concrete mixture is shaped prism patterns identical mobility of 40 × 40 × 160 mm for the quality control of parameters of the compressive strength and water absorption.
Concrete hardening is carried out under normal conditions, and the test results according to GOST 10180-90 "Methods for determining the strength of control samples" are presented in table 3.
Examples confirming the preparation of a mixture for high-strength concrete with a nanodispersed additive.
Example 1. A modifying additive - nanosized powder of silicon dioxide Tarkosil-05 is subjected to ultrasound treatment in an ultrasonic disperser UZDN-A together with mixing water for 10 minutes. VNV-100 is mixed with aggregates - quartz-feldspar sand with a fineness modulus of Mkr. = 2.1 and granite screenings of a fraction of 2.5-5 mm.
The content of components in the mixture, in wt.%:
VNV-100 26.3
Quartz feldspar sand
with modulus fineness Mkr. = 2.1 32.88
Granite screenings fraction 2.5-5 mm 32.88
Nanodispersed powder of silica Tarkosil-05 0.013.
After stirring for 4-5 minutes, water is added in an amount of 7.927 wt.% - W / C ratio of 0.30, then beam samples 40 × 40 × 160 mm in size are formed from the resulting concrete mixture. Samples harden under normal conditions at t = 20 ± 2 ° C and a humidity of 95%.
The compressive strength of samples aged 3 days 40 MPa, aged 28 days 61 MPa, water absorption of 2.6 wt.%.
Example 2. Carried out analogously to example 1, in the following ratio of components, wt.%:
VNV-100 26.48
Quartz feldspar sand
with size modulus Mkr. = 2.1 33.08
Granite screenings fraction 2.5-5 mm 33.08
Nanodispersed powder of silicon dioxide Tarkosil-05 0,032.
To obtain a concrete mixture, water is taken in an amount of 7.328 wt.%, W / C - a ratio of 0.28. The compressive strength at the age of 3 days is 49 MPa, 28 days 74 MPa, water absorption of 1.42 wt.%.
Example 3. Carried out analogously to example 1, in the following ratio of components, wt.%:
VNV-100 26.66
Quartz feldspar sand
with size modulus Mkr. = 2.1 33.2
Granite screenings fraction 2.5-5 mm 33.2
Nanodispersed powder of silica Tarkosil-05 0,052.
To obtain a concrete mixture take water in an amount of 6.888 wt.%, W / C - the ratio of 0.26. The compressive strength at the age of 3 days is 60 MPa, 28 days 90 MPa, water absorption of 1.21 wt.%.
Example 4. Carried out analogously to example 1, in the following ratio of components, wt.%:
VNV-70 - 26.26
Quartz feldspar sand
with size modulus Mkr. = 2.1 32.8
Granite screenings fraction 2.5-5 mm 32.8
Nanodispersed powder of silica Tarkosil-05 0.013.
To obtain a concrete mixture, water is taken in an amount of 8.127 wt.%, W / C - a ratio of 0.31. The compressive strength at the age of 3 days is 35 MPa, 28 days is 53 MPa, and water absorption is 3.8 wt.%.
Example 5. Carried out analogously to example 1, in the following ratio of components, wt.%:
VNV-70 26.38
Quartz feldspar sand
with modulus of fineness Mkr. = 2.1 32.96
Granite screenings fraction 2.5-5 mm 32.96
Nanodispersed powder of silicon dioxide Tarkosil-05 0,032.
To obtain a concrete mixture, water is taken in an amount of 7.668 wt.%, W / C - a ratio of 0.29. The compressive strength at the age of 3 days is 41 MPa, 28 days is 62 MPa, water absorption is 2.5 wt.%.
Example 6. Carried out analogously to example 1, in the following ratio of components, wt.%:
VNV-70 26.5
Quartz feldspar sand
with size modulus Mkr. = 2.1 33.1
Granite screenings fraction 2.5-5 mm 33.1
Nanodispersed powder of silica Tarkosil-05 0,052.
To obtain a concrete mixture, water is taken in an amount of 7.248 wt.%, W / C - a ratio of 0.27. The compressive strength at the age of 3 days 54 MPa, 28 days 82 MPa, water absorption of 1.25 wt.%.
Table 4 shows comparative data on compressive strength at the age of 3 and 28 days of normal hardening, water absorption by weight of high-strength concrete obtained according to the invention in comparison with the prototype (See Komokhov P.G. Sol-gel as a concept of nanotechnology of cement composite / / Building materials. - 2006. - No. 9. - p. 89-90).
Table 4
Physicotechnical Properties unit of measurement Concrete with nanosized powder of silica Tarkosil-05 Concrete with H 2 SiO 3 sol
Average density kg / m 3 2450 2400
Compressive strength after 3 days MPa 32-60 51-63
Compressive strength after 28 days MPa 53-90 62-76
Water absorption % by weight 1.2-3.5 2.5-2.6
Thus, the proposed composition for producing high-strength concrete with nanodispersed additive - nanosized powder of silicon dioxide Tarkosil-05 has the following advantages compared to the prototype (see Komokhov P.G. Zol-gel as a concept of nanotechnology of cement composite // Building materials. - 2006 . - No. 9. - p. 89-90):
- the effect of increasing strength is achieved due to the use of nanosized powder of silicon dioxide Tarkosil-05, which results in the acceleration of the pozzolanic reaction and the formation of a large number of calcium hydrosilicates, mainly low-basic type CSH (I), which leads to accelerated hardening and increased strength; - compressive strength obtained concrete using a new additive - nanosized powder of silicon dioxide Tarkosil-05 higher compressive strength of concrete using Zola H 2 SiO 3 , which explains They increase the density of the obtained concrete, and the amount of the additive - nanosized powder of silicon dioxide Tarkosil-05 is in the range of 0.013-0.052%, while in concrete with H 2 SiO 3 sol the content of the additive is 0.75%;
- obtaining a binder of low water demand using perlite rocks allows you to save up to 30% of Portland cement without reducing the strength indicators.
The proposed mixture for high-strength concrete with a nanodispersed additive based on Portland cement, quartz-feldspar sand with a fineness modulus of 2.1, granite screenings and a new additive of nanosized powder of silicon dioxide Tarkosil-05 can be used for the manufacture of concrete products in civil and industrial construction, including using nanotechnology.

Claims (2)

1. The raw material mixture for high-strength concrete with a nano-dispersed additive, including cement, quartz-feldspar sand with a particle size of 2.1, granite screenings of a fraction of 2.5-5 mm, the additive and water, characterized in that the additive contains nanosized powder of silicon dioxide Tarcosil -05, which is pre-treated in an ultrasonic disperser UZDN-A with mixing water, and as a binder it contains a binder of low water demand VNV-100 in the following ratio of components, wt.%:
VNV-100 26.3-26.66 Quartz feldspar sand with particle size 2.1 32.88-33.2 Granite screenings fr. 2.5-5 mm 32.88-33.2 Nanodispersed powder silica tarcosil-05 0.013-0.052 Water 6,888-7,927
2. The raw material mixture for high-strength concrete with a nano-dispersed additive, including binder, quartz-feldspar sand with a particle size of 2.1, granite screenings of a fraction of 2.5-5 mm, the additive and water, characterized in that the additive contains nanosized powder of silicon dioxide Tarcosil -05, which is pre-treated in an ultrasonic disperser UZDN-A with mixing water, and as a binder it contains a binder of low water demand VNV-70 in the following ratio of components, wt.%:
VNV-70 26.26-26.5 Quartz feldspar sand with particle size 2.1 32.8-33.1 Granite screenings fr. 2.5-5 mm 32.8-33.1 Nanodispersed powder silica tarcosil-05 0.013-0.052 Water 7,248-8,127,

in addition, perlite is used as a filler in VNV-70.
RU2011125430/03A 2011-06-20 2011-06-20 Crude mixture for high-strength concrete with nanodispersed additive (versions) RU2489381C2 (en)

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RU2599739C1 (en) * 2015-08-05 2016-10-10 Вадим Владимирович Потапов Methods of increasing concrete strength at compression using nanosilica obtained from hydrothermal solution
RU2601885C2 (en) * 2014-01-09 2016-11-10 Общество с ограниченной ответственностью Научно-исследовательская компания "Усиление оснований и фундаментов" Method of strengthening solution preparation
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RU2599739C1 (en) * 2015-08-05 2016-10-10 Вадим Владимирович Потапов Methods of increasing concrete strength at compression using nanosilica obtained from hydrothermal solution

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