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
Title | Year | Author | Number |
---|---|---|---|
METHOD OF PRODUCTION OF BIOSILICATED NANOTUBES | 2013 |
|
RU2539734C1 |
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RU2824762C1 |
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RU2471752C1 |
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RU2489381C2 |
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CONCRETE PREPARATION COMPOUND | 2007 |
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RU2345005C2 |
Authors
Dates
2015-07-20—Published
2013-12-12—Filed