Method of production of nanodisperse additive for concrete

FIELD: biotechnologies.

SUBSTANCE: method of production of nanodisperse additive for concrete is offered. Cyanobacteria of the sort Pseudanabaena sp. 0411 or Leptolyngbya laminosa 0412 are cultivated in a nutrient medium at the temperature 23-25°C. The nutrient medium is Z-8 medium with adding of sodium silicate solution neutralized by 2 M HCl. Ratio of solution of silicate of sodium and Z-8 5:1 medium. Cultivation is carried out in the bioreactor at continuous lighting and mixing during 10 days with the subsequent removal of nutrient medium residue. Then the culture is poured by 30% hydrogen peroxide solution and heated up to 70°C. The produced biosilicated nanotubes are washed out by distilled water with subsequent treatment in a mechanical activator in the water medium of anion surface-active substance of naphthalene formaldehyde type at the ultrasound frequency 35 kHz and concentration of solid phase 5% up to the particle size 85-250 nanometres.

EFFECT: increase of mobility of concrete mix, curing acceleration, increase of strength and density of concrete, decrease of water absorption.

3 tbl, 1 ex

 

The invention relates to the construction and building materials industry, in particular to methods of manufacturing nanosized additives in cement concrete and mortars to increase the mobility of the concrete mix, improve the strength and density of concrete, reduce water absorption, accelerate hardening of building products and components.

Currently known methods for producing a plasticizer by processing the waste products of microorganisms. The technical result - improving the mobility of the concrete mix and strength of concrete.

Existing methods for producing plasticizers for concrete, the known method of obtaining supplements by treatment with 0.5 to 5% aqueous solution of molasses on the basis of hydrocarbons by microorganisms Bacillus species with a concentration of 107-108 cells/ml, followed by maintaining the resulting solution at 15-35°C for 3-7 days [USSR author's certificate 1724632]. However, in this method, the nutrient medium used is an aqueous solution of molasses, characterized by instability of the composition, which complicates the process and increases the time of its implementation.

The closest in technical essence and the achieved result is a method of obtaining supplements by cultivation on a nutrient medium [Patent No. 2133239] with the addition of oleic acid BA�kind of matter Leuconostos mesenteroides in catalogna mode (160 rpm) for 24-48 h at 23-25°C.

The disadvantages of this method are the selective effect of the additive with increasing mobility of the concrete mix and low strength concrete under compression and bending at an early age and after 28 days of hardening are available for different components of the concrete mix, making it ineffective.

The problem underlying the claimed invention, consists in the implementation of the method of producing nanodispersed additives for concrete, allowing to increase the mobility of the concrete mixture, as well as the strength and density of concrete, reduce its water absorption, accelerate hardening, reduce the consumption of cement.

This task is achieved by the fact that in the method of producing nanodispersed additives for concrete as a culture medium using the Z-8 with the addition of sodium silicate solution, neutralized with 2 M HCl, and when the ratio of sodium silicate solution and environment Z-8 5:1 cultivation is carried out in the bioreactor under the same illumination and stirring for 10 days followed by removal of the remnants of the nutrient medium, and then culture pour 30% solution of hydrogen peroxide and heated to 70°C, received biorepositories nanotubes are washed with distilled water followed by processing mechanoactivated in an aqueous medium an anionic surfactant naphthaleneformaldehyde type at a frequency of at�of trasloco 35 kHz and the concentration of the solid phase of 5% to a particle size of 85-250 nm.

It is established that as a result of ultrasonic dispersion biorefining of nanotubes in the aquatic environment anionic surfactants naphthaleneformaldehyde type fragmentation occurs before the formation of nanosized particles. In turn, the surfactant anions inhibit aggregation biorefining nanotubes.

Example. To mineral Z-8 add: 0.05 g/l of NH4Cl and the solution obtained by the neutralization 7,71 g of 40% HCl 5.16 g of sodium silicate to a pH of 7.0 at a ratio of 5:1 and injected into the solution culture of cyanobacteria. Cultivation of cyanobacteria is carried out in a bioreactor with constant lighting and temperature 25°C, with replacement of the nutrient medium 1 every 2 days. The process of biocritical lasts 10 days, after which the remnants of the nutrient medium are merged, the culture is filled with a 30% solution of hydrogen peroxide and heated to 70°C. the Obtained biorepositories nanotubes are washed with distilled water followed by processing in mechanoactivated in an aqueous medium an anionic surfactant naphthaleneformaldehyde type (p-3) at a frequency of 35 kHz ultrasound and concentration of the solid phase of 5% to a particle size of 85-250 nm.

The additive was mixed with the mixing water and prepared concrete mix: cement:sand:gravel = 1:2,8:5,6. Portland Cement P�500-D0.

From the concrete mix (the number of additives are listed in table. 2) molded samples, which were hardened in normal conditions for 28 days. At the expiration of that time determined the mobility of the concrete mixture, the concrete strength in compression and bending, as well as water absorption. The test results are shown in table. 3.

The mechanism of the effect of complex nanosized additives manufactured according to the inventive method, on the properties of concrete mixture and concrete is associated with acceleration of the hydration of clinker minerals of cement. Due to the interaction of portlandite with biorepository nanotubes in the pore space of the cement stone hardening of concrete is the formation of additional amounts of ettringite and predominantly low-basin hydrosilicates of calcium, contributing to the seal structure and is responsible for the increase of concrete strength. Thus biorepositories nanotubes act as centers of crystallization of hydration products of cement.

The maximum effect of the application of complex nanosized additives, manufactured by the proposed method is observed when the content of 0.3-0.5% by weight of cement (in terms of dry substance). The limit of compressive strength increases after 3 days of hardening 1.7-2.5 times, after 28 days of hardening in 1.6-2 times, Flexural after 28 days of hardening in 2-3,6 RA�and, water absorption decreases in 2,3 or 4 times.

Furthermore, the proposed method of manufacturing nanosized additives can improve the performance of ready-mixed concrete plants, precast concrete, to increase the turnover of forms, reduce the consumption of cement up to 30% and power consumption by steaming products and structures.

A method of producing nanodispersed additives for concrete through cultivation on a nutrient medium of the microorganisms at a temperature of 23-25°C, characterized in that the microorganisms are using the cyanobacteriumPseudanabaenasp. 0411 orLeptolyngbya laminosa0412, as a nutrient medium using the Z-8 with the addition of sodium silicate solution, neutralized with 2 M HCl, and when the ratio of sodium silicate solution and environment Z-8 5:1, the cultivation is carried out in the bioreactor under the same illumination and stirring for 10 days followed by removal of the remnants of the nutrient medium, and then culture pour 30% solution of hydrogen peroxide and heated to 70°C, received biorepositories nanotubes are washed with distilled water followed by processing in mechanoactivated in an aqueous medium an anionic surfactant naphthaleneformaldehyde type at a frequency of 35 kHz ultrasound and concentration of the solid phase of 5% to a particle size of 85-250 nm.



 

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