The claimed invention relates to the building materials industry and it may be used in production of concrete mixtures in manufacturing prefabricated reinforced concrete and in monolithic construction.
A method for introducing a polymer during preparation of a bitumen-concrete mixture is known, the method is unique in that the polymer is introduced directly into a mineral portion of the bitumen-concrete mixture, and it is retained under the mixing temperature after the components are mixed during 1.5-2 hours (patent of Ukraine No. 105294, publ. on Mar. 10, 2016).
Also, these are known:
Main drawbacks for said technical solutions in the above-listed analogues are the following: characteristically high coefficient of hardness variation of the concrete properties and relatively high water waste and plasticizing and/or other additives under other equal conditions that increases costs for manufacturing the concrete mixture significantly with necessary values of its hardness and plasticity.
The one that is the closest to the claimed invention, according to the set of features, is a method for producing a concrete by adding a pretreated activated water to a cement-sand mixture taken in certain proportions and their mixing, the method is characterized in that the water is activated by subjecting it to high-voltage pulse discharges having the pulse energy of from 312 J to 625 J and a discharge repetition rate of from 1 Hz to 4 Hz (patent of Ukraine No. 110556, publ. on Oct. 10, 2016).
Drawbacks of the prototype are the following:
The underlying problem of the invention is to increase the hardness and plasticity of the concrete, as well as to reduce the amount of water that is necessary to produce the concrete mixture, and not to use surfactants and other additives.
The technical problem is solved by performing a novel type of operation of preactivation of water that allows to create a volume non-linear cavitation and to obtain water having novel physical and chemical properties, namely: by pretreatment of water (that is used for tempering the concrete mixture in a combination of water and cement only) by electrospark cavitation in a flow through mode with usage of copper and/or iron and/or titanium electrodes, with necessary parameters of direct current voltage, current strength, under the given pulse rate, followed by treatment of water by a mechanical and/or ultrasound cavitator in a developed cavitation mode in the flow through with a given water pressure value.
The proposed invention operates as follows.
Firstly, the water is treated by the electrospark cavitation in a flow through mode with usage of copper and/or iron and/or titanium electrodes, under the direct current voltage in the range of from 500 V to 5000 V, current strength in the range of from 0.1 A to 10 A, pulse rate in the range of from 2 Hz to 10000 Hz.
Then, this water is treated by a mechanical and/or ultrasound cavitator in a developed cavitation mode in the flow through under the water pressure in the range of from 0.8 atm to 6 atm.
Thereafter, the concrete mixture is made with the water prepared by the above-mentioned method. In order to temper the concrete mixture, water and cement are used, which are taken in the. range of ratio water/cement respectively: from 4/10 to 8/10.
The technical effect of such treatment of tempering water is a reduction of water usage by 40÷50% in order to prepare the concrete mixture as compared with the untreated water, increase of the plasticity of the concrete mass, with reduction of water usage, due to reduction of the surface tension value by 10-30%, and increase of the concrete strength in the range of from 20% to 60% at 28th day, without introduction of plasticizers and/or surfactants into the mixture.
Number | Date | Country | Kind |
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a 2018 01909 | Feb 2018 | UA | national |
Filing Document | Filing Date | Country | Kind |
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PCT/UA2019/000022 | 2/15/2019 | WO |
Publishing Document | Publishing Date | Country | Kind |
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WO2019/164469 | 8/29/2019 | WO | A |
Number | Name | Date | Kind |
---|---|---|---|
20200392022 | Mykytiuk | Dec 2020 | A1 |
Number | Date | Country |
---|---|---|
108689652 | Oct 2018 | CN |
108821634 | Nov 2018 | CN |
2160242 | Dec 2000 | RU |
2188758 | Sep 2002 | RU |
2249573 | Apr 2005 | RU |
2249573 | Apr 2005 | RU |
112088 | Jan 2012 | RU |
2508273 | Feb 2014 | RU |
2600353 | Oct 2016 | RU |
105294 | Mar 2016 | UA |
110556 | Oct 2016 | UA |
Entry |
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Dolinsky A.A., “Use of cavitation technologies in the processing of liquid heterogeneous systems”, Journal of Odessa National Academy of Food Technologies, 2014, vol. 45, No. 3, ISSN 2072-8730, pp. 9-13. |
Fokin G.A., “Acoustic and vortex fields in water-containing systems: monograph”, 2013. |
Petrov A.G. et al., “Improving the properties of cement stone by ultrasonic activation of the mixing water”, Proceedings of the 57th scientific and technical conference of students and young scientists, 2011, pp. 112-116. |
Petrov A.G., “Road cement concrete on ultrasonic activated mixing water”, abstract of dissertation, 2013. |
Promtov M.A., “Prospects of Cavitation Technologies Application for Intensification of Chemical Technological Processes”, 2008, vol. 14, No. 4, pp. 861-869. |
Savenkov A.I., “Concretes activated by high-voltage impulse treatment: abstract of dissertation”, 2000. |
Yudina A.F., “Resource-saving technology of concrete work based on the use of electro-treated mixing water”, Dissertation, Saint Petersburg, 2009. |
Number | Date | Country | |
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20200392022 A1 | Dec 2020 | US |