Complex admixture for concrete mix, and method for its manufacture

FIELD: construction.

SUBSTANCE: complex admixture for concrete mix contains Giperlit hyperplasticising agent and Taunit carbon nanostructured material (CNM) at the following component ratio, wt %: Giperlit hyperplasticising agent - 99.5-99.7, Taunit carbon nanostructured material - 0.3-0.5. A preparation method of the proposed complex admixture consists in ultrasonic dispergation of Taunit carbon nanostructured material in Giperlit hyperplasticising agent during 3-7 minutes by means of UZG13-0.1/22 ultrasonic generator.

EFFECT: increasing growth rate of strength of concretes at early hardening stage at preservation of their high final strength; increasing freeze resistance and water non-permeability.

2 cl, 1 tbl

 

The invention relates to the field of construction, namely the composition of complex additives for concrete mixtures and methods for their preparation, and may find application in the manufacture of concrete products and structures.

Known method of preparing a modified fiber-reinforced concrete mixture and the modified fiber-reinforced concrete mix (EN 2397069 C1, pub. 20.08.2010), which is used for road and airfield construction, in the manufacture of prefabricated and monolithic concrete products and structures.

This mixture comprises Portland cement M500, a fiber of Mixart" steel, filler, plasticizer additive "Polyplast SP-3" multi-layer carbon nanotubes (CNTS) in the following ratio, kg/m3mix: Portland 320-330, filler 1900-1920, steel fiber 70-80, superplasticizer 1,6-1,72, multiwall CNTS are 0.010 to 0.015, water mixing 130-145.

The method of preparation is that the mixing in the mixer of Portland cement, steel fiber, filler, plasticizer and mixing water, previously conducted the dispersion of Portland cement and superplasticizer in linear induction rotator obtained dry mixture together with the mixing water and multilayer carbon nanotubes treated in an ultrasonic disperser.

N�prosperity of this invention is the low strength of the resulting concrete, as well as the low efficiency of the process of preparation of the mixture.

Known concrete mixture (EN 2355656 C2, pub. 20.11.2008), including cement M500, filler, water and basalt fiber, modified substance selected from the group comprising polyhedral multilayer carbon nanostructures fulleroid type and multilayer carbon nanotubes, taken in an amount of 0.0001-0.005 wt.h. one wt.h. basalt fiber, wherein the filler blend comprises a filler selected from the group comprising a mixture of gravel with a mixture of sand and gravel aluminosilicate microspheres, and optionally the concrete mixture contains a plasticizer polynaphthalenesulfonate of sodium at the following ratio (% wt.): cement 24-48 filler 30-60 modified basalt fiber 2-6, a plasticizer 0.9 to 1.1, water - the rest.

However, the use in the present invention, the plasticizer on the basis of polynaphthalenesulfonate sodium is not possible to obtain concrete with a high brand strength and durability.

The prototype is the modifier necessary building materials (EN 2482082 C2, pub. 20.02.2013) containing carbon nanostructured materials (CNM), a filler and a plasticizer, wherein the carbon nanomaterial is introduced in the form of nanotubes "Taunit", as the plasticizer mixture contains polyvinylpyrrolidone, ka�ETS filler - polyethylene glycol PEG-1500 and additionally contains sodium bicarbonate and citric acid with the following ratio of components, wt.%: CNM "Taunit" 0,1-8, polyvinyl-pyrrolidone and 0.1-8, sodium 5,5-11,5, citric acid 5,5-11,5, polyethylene glycol PEG-1500 - else.

The use of this complex additives can improve the strength of construction materials. The disadvantage of this invention is the low mobility of the concrete, low strength concrete in the early stages of hardening and low durability of the resulting concrete.

A method of preparing a complex additives for concrete mix, which consists in an ultrasonic dispersion of carbon nanotubes "Taunit" in the solution of the plasticizer S-3 and alcoholic suspension (gabidoullin M. G., Husin A. F., R. Rakhimov Z. Ultrasonic treatment is an effective method of dispersing carbon nanotubes in composite construction // Building materials. 2013. No. 3. P. 57-59).

The use of this mixture can improve the strength of concrete. The disadvantage is the low strength of concrete in the early stages of hardening.

The object of the present invention is a sharp increase in the growth rate of the concrete strength in the early stages of hardening, providing high-grade strength, high frost resistance and water resistance, and that�same uniform distribution of carbon nanomaterial in its structure.

The technical result - the high strength characteristics of concrete in the early stages of hardening, high brand strength.

The result is achieved in that in a complex additive for concrete mixtures containing a plasticizer and carbon nanostructured material "Taunit" according to the invention comprises as the plasticizer - giperplasticizer "Hyperlite", with the following ratio of components, wt.%:

Specialiteter "Hyperlite" - be 99.5 to 99.7

Carbon nanostructured material "Taunit" - 0.3 to 0.5.

The result is achieved in that in the method of making complex additives for concrete mix, which consists in an ultrasonic dispersion of carbon nanostructured material "Taunit" in the plasticizer according to the invention, the nanostructured carbon material is subjected to ultrasonic dispersion in hyperplasticity "Hyperlite" for 3-7 minutes with an ultrasonic generator USG-0,1/22. Ultrasonic dispersion characterized by the following parameters: frequency 20,35-23,65 kHz, power 100 W, wavelength 0,127·105-0,147·105M.

For this complex additives used carbon nanostructured material "Taunit" - coaxial multi-layer carbon nanotubes with an outer diameter of 8 to 15 nm and a length of more than 2 μm. The number of slo�in one tube 6-10.

Giperplasticizer "Hyperlite" copolymer-based polyoxyethylenated derivatives of unsaturated carboxylic acids, is a light-brown liquid, aqueous solution with a dry matter content of 30-35%.

Complex additive were prepared by ultrasonic dispersion. Carbon nanostructured material "Taunit" was subjected to ultrasonic dispersion in hyperplasticity "Hyperlite" for 3-7 minutes with an ultrasonic generator USG-0,1/22, with the following component ratio, wt.%:

Giperplasticizer "Hyperlite" - be 99.5 to 99.7

Carbon nanostructured material "Taunit" - 0.3 to 0.5.

Further, the additive was introduced into the concrete mixture in the form of an aqueous solution of working concentration with mixing water in an amount of 1-1,5% by weight of cement in terms of dry substance.

For the preparation of concrete mix production the composition used cement M400 HRC D20 Wolski plant that meets the requirements of GOST 10178-85, sand Kamsko-Ustinsky Deposit that meets the requirements of GOST 8736-93 and GOST 8735-88 and rubble Kamsko-Ustinsky deposits that meet the requirements of state standards for concrete, with the following ratio (mass.h.):

Cement:aggregate:sand = 1:1,31:2,53

Water was added to the concrete mix to achieve equal mobility (class P2) �about GOST 7473-94. Water-cement ratio of the composition without the additive was - 0.43, with a complex additive - 0.32, with the addition of the prototype - 0,36.

From concrete mixtures were produced samples - cubes with dimensions 10×10×10. After 1, 3, 7, 28 days normal curing the samples were subjected to mechanical tests. The strength of the samples was determined in accordance with GOST 18105-86, frost - GOST 10060.0-95, and the resistance - according to GOST 12730.5-84.

The composition of complex additives and mechanical test results of the concrete are shown in the table. Were also conducted tests of concrete and concrete with the additive analogue and without additives.

Based on these data it can be concluded that the concrete with the use of complex additives on the first day has a compressive strength higher 87-131%, 3 day - 50-58%, on day 7 - 49-55%, and 28 days 39-45% compared with the prior art. At the age of 28 days frost resistance increased to 100 cycles, and the resistance - at one stage.

The obtained results allow assert that the complex additive increases the rate of strength development of concrete in the early stages of hardening and allows to achieve a high final strength, frost resistance and water resistance.

1. Complex additive for concrete mixtures containing a plasticizer and carbon nanostrukturirovanie�th material "Taunit", characterized in that the plasticizer is used giperplasticizer "Hyperlite", with the following ratio of components, wt.%:
Giperplasticizer "Hyperlite" is 99.5-99.7 á,
Carbon nanostructured material "Taunit" - 0.3 to 0.5.

2. Preparation of complex Supplement, which consists in dispersion of carbon nanostructured material "Taunit" in the plasticizer, characterized in that the nanostructured carbon material is subjected to ultrasonic dispersion in hyperplasticity "Hyperlite" for 3-7 minutes with an ultrasonic generator USG-0,1/22.



 

Same patents:

FIELD: construction.

SUBSTANCE: protective mix of road pavements includes a black organic binding substance, a hardening modifier and a solvent in the following ratio, wt %: black organic binding substance - coal tar asphalt 45-55%; hardening modifier - acetone 4-6%; adhesive additive STARDOP 130P 1-3 wt %; solvent is the rest.

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1 tbl

FIELD: chemistry.

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2 cl, 2 tbl

FIELD: chemistry.

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2 tbl, 9 ex

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21 cl, 2 ex, 3 tbl

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2 cl, 7 dwg, 11 tbl

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FIELD: chemistry.

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3 dwg

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FIELD: nanotechnology.

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20 dwg

Magnetic materials // 2244971

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EFFECT: enhanced speed of nonvolatile memory integrated circuits for computers of low power requirement.

4 cl, 8 dwg

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