Method for production of concrete plasticizer from distillery dreg

FIELD: building materials, in particular concrete additives (plasticizer).

SUBSTANCE: method includes centrifugal preseparation of distillery dreg to provide concentrate, treatment obtained concentrate with alkali carbonate to pH 8-11, followed by addition of superplasticizer or lignosulfonate solution providing ratio of total amount of alkali carbonate and concentrate to amount of solution ‹1. Superplasticizer or lignosulfonate solution is added to obtained centrifuge effluent, providing ratio of centrifuge effluent to said solution from 0.2 to 2.0 to produce another plasticizer. Dry alkali carbonate content is not more than biomass content in raw distillery dreg. Method of present invention is useful in concrete mixtures manufacturing for producing of precast concrete and cast-in-place constructions.

EFFECT: concrete mixtures with controlled flow characteristic and concrete curing rate.

2 cl, 4 ex

 

The invention relates to the production of building materials, in particular to the field of additives (plasticizers) to concrete, and can be used in the production of concrete mixtures for the manufacture of precast elements and monolithic concrete structures.

A method of obtaining an additive to concrete (RU, patent 2167117, SV/02, 1993), including a mixture of rosin with ethyl alcohol.

The disadvantage of this method should recognize the low mobility of the resulting concrete mixture.

Also known is a method of obtaining an additive to concrete (SU authorship 814978, SW/24, 1981), including the processing of bards yeast production modifier.

A disadvantage of the known additives admittedly low mobility of the resulting concrete mixture.

A method of obtaining an additive to concrete (SU authorship 1726429, SV/00, 1989), including the treatment of liquid waste microbiological production (waste feed yeast) salts of alkali metals.

A disadvantage of the known additives admittedly low mobility of the resulting concrete mixture.

The closest analogue of the proposed method of obtaining concrete additives can be recognized as the method of preparation of plasticizers for concrete from sulfite-alcohol stillage comprising prewar the positive separation by centrifugation spirit bards getting a concentrate, which is treated with limestone (see, A.S. the USSR # 113773 AND SW/18, 1958).

A disadvantage of the known additives admittedly low mobility of the resulting concrete mixture.

The technical problem to be solved by the proposed method consists in the development of plasticizers that provide flexibility and ease of installation of a concrete mix for a long time after mixing without reducing the strength of the concrete.

The technical result obtained by the implementation of the method consists in providing a control flow of the concrete mix and the rate of hardening of concrete.

To achieve the technical result of the proposed use of the method of preparation of plasticizers for concrete of alcohol stillage including a preliminary separation by centrifugation spirit bards getting a concentrate, which is treated with a carbonate, according to which it is treated to a pH of 8-11 using as carbonate carbonate solution of an alkali metal, then add a solution of superplasticizer C-3 or lignosulfonate, providing a ratio of the total quantity of the carbonate of an alkali metal and concentrate to the amount specified solution is less than unity with getting plasticizer, and obtained by dividing the centrate add solution C-3 or lignosulfonic the tov, providing a ratio centrate : the specified solution from 0.2 to 2.0, with other plasticizer. In a preferred implementation the content of dry carbonate of an alkali metal does not exceed the biomass content in the original spirit bard.

To obtain the first plasticizer concentrate alcohol stillage is treated with potash by adding a constant or periodic stirring, in an amount not less than the dry weight of the concentrate spirit bards, while the pH of the resulting suspension shall be not less than eight. Next, the processed concentrate alcohol stillage is mixed with water-reducing substance, such as lignosulfonate, the total amount of concentrate spirit bards and potash in relation to the lignosulfonate must exceed one. Also as water-reducing substance is possible to use industrial manufactured product superplasticizer C-3 in the same mass ratio. The above results sverhsummarny effect mobility of concrete mixtures with the addition of these plasticizers is slowed down considerably, and the strength of hardening increases.

The second plasticizer is obtained by mixing the supernatant alcohol stillage with water-reducing substance (lignosulfonate or superplasticizer C-3) in the mass ratio of the fugues is that to water-reducing substance is not greater than one. The observed sverhsummarny effect in this case is to increase the mobility of the concrete mixtures in relation to the first plasticizer, but at the same time there is a decrease in the strength of the concrete mixtures when setting.

When additional microbiological treatment of effluents, resulting in a decrease of reducing substances from the treated supernatant by centrifugation to separate the biomass and secondary centrate using ultrafiltration to separate concentrate and ultrafiltrate. The concentrate is used as a plasticizer. Usually ultrafiltrate obtained is mixed with superplasticizer C-3 with obtaining the fourth plasticizer.

The proposed method for the preparation of plasticizers for concrete can be illustrated by the following examples.

1. The original alcohol bard with a concentration of dry substances of 7% in the amount of 5000 kg divided by centrifugation to concentrate the alcohol stillage concentration of solids 15% in the amount of 1000 kg, and centrate spirit bards, with a concentration of dry substance 5% in the amount of 4000 kg. Further to concentrate the alcohol stillage in the amount of 1000 kg add 40% solution of potash in the amount of 200 kg, while maintain the ratio of potash to concentrate alcohol stillage less than unity when the pH of the resulting mixture, 9.5, correcting it if necessary. D. the more add 30% solution of superplasticizer C-3 in the amount of 1500 kg, providing a ratio of the total quantity of potash and concentrate alcohol stillage to the superplasticizer C-3 less than unity when the pH of the resulting mixture, 9.5. To test the effectiveness of the plasticizer was performed on a concrete mixture with Portland cement grade 500, in the amount of 450 kg/m3when the ratio of cement: sand: gravel =1:1,6:2,2 with a ratio of water: cement, equal 0,42. The amount of the additive was 0.5% by weight of cement. The initial fluidity of the concrete mass amounted to 0.24 m precipitation standard cone. After 1 hour, the mobility remained unchanged after 2 hours was reduced to 0.18 m, 3 h decreased to 0.10 M. the Increase in strength of the resulting concrete at 20°was: after 1 day of 2.6 MPa after 3 days - 24,0 MPa after 7 days - 41,2 MPa after 28 days of 54.4 MPa.

2. To your earlier centrate with a concentration of dry substance 5% and in the amount of 4000 kg add 50% concentrate of lignosulfonate with constant stirring, at the same time supporting the ratio of supernatant to the lignosulfonate less than unity when the pH of the resulting mixture, 9.5, correcting it if necessary. To test the effectiveness of the plasticizer was performed on a concrete mixture with Portland cement grade 500, in the amount of 450 kg/m3when the ratio of cement: sand: gravel =1:1,6:2,2 with a ratio of water: cement, equal 0,42. The amount of injected additives status who had declined to 0.4% by weight of cement. The initial fluidity of the concrete mix was 0.21 m precipitation standard cone. After 1 hour, the mobility remained unchanged after 2 hours was reduced to 0.20 m, 3 h decreased to 0.17 m Increase the strength of concrete at 20°was: after 1 day - 0,0 MPa (not hardened), after 3 days - 12,0 MPa after 7 days of 36.6 MPa after 28 days - 48,0 MPa.

3. Centrate with a concentration of dry substance 5% and in the amount of 4000 kg is subjected to a microbiological process, resulting in a decrease of reducing substances to 0.2% of the mass. Of treated supernatant by centrifugation to separate the biomass in the amount of 800 kg and secondary centrate using ultrafiltration share to concentrate in the amount of 1200 kg and ultrafiltrate in the number of 2100 kg of Concentrate used as a plasticizer. To test the effectiveness of the plasticizer was performed on a concrete mixture with Portland cement grade 500, in the amount of 450 kg/m3when the ratio of cement : sand : gravel =1:1,9:2,3 when the ratio of water: cement, equal 0,42. The amount of injected additives amounted to 0.4% by weight of cement (on dry matter). Initial motility was 0.21 m precipitation standard cone. After 1 hour, the mobility of the concrete mixture was 0.17 m, 2 hours decreased to 0.12 M. Vostokovedenie was at the initial moment of 5.6%, after 2 hours of 4.8%. Increase the strength of concrete when tordini is at 20° C and humidity of 85-95% made: after 1 day - 8.0 MPa, after 3 days - 20.0 MPa, after 7 days of 38.4 MPa after 28 days of 49.6 MPa. Mark concrete frost resistance amounted to 300 F (37 cycles of alternate freezing to -50°and thawing up to +20° (C), and in salt solution, the strength decreased by only 4.7%.

4. Ultrafiltrate in the amount of 2000 kg with a solids content of 3% was mixed with 40 kg of 3% of the mass. solution superplasticizer C-3 with obtaining the fourth plasticizer. To test the effectiveness of the plasticizer was performed on a concrete mixture with Portland cement grade 500, in the amount of 450 kg/m3when the ratio of cement: sand: gravel =1:2,3:3,0 using 350 kg of cement per 1 m3concrete. The ratio of water to cement was 1:0,48. The amount of plasticizer amounted to 0.40% by weight of cement. Initial sediment standard cone was 0.18 m, after 1 hour to 0.14 m, after 2 hours of 0.10 m Growth strength: after 1 day to 10.1 MPa, after 3 days of 30.9 MPa after 7 days of 38.3 MPa in 28 days to 58.6 MPa).

Using the same water, gravel, sand and cement using standard superplasticizer C-3 in the amount of 0.5% by weight of cement obtained the following results: initial sediment standard cone amounted to 0.20 m, after 1 hour to 0.14 m, after 2 hours of 0.07 m Growth strength: after 1 day - 14,0 MPa, after 3 days the to - 32,2 MPa after 7 days of 42.3 MPa after 28 days - 55,0 MPa.

Thus, using the proposed method allows to control the fluidity of the concrete mixture and the rate of hardening of concrete, as well as its technological characteristics.

1. The method of preparation of plasticizers for concrete of alcohol stillage including a preliminary separation by centrifugation spirit bards getting a concentrate, which is treated with a carbonate, characterized in that it is treated to a pH of 8-11 using as carbonate carbonate solution of an alkali metal, then add a solution of superplasticizer C-3 or lignosulfonate, providing a ratio of the total quantity of the carbonate of an alkali metal and concentrate to the amount specified solution is less than unity with getting plasticizer, and obtained by dividing the centrate add solution C-3 or lignosulfonate, providing a ratio centrate:the specified solution from 0.2 to 2.0 with other plasticizer.

2. The method according to p. 1, characterized in that the content of dry carbonate of an alkali metal does not exceed the biomass content in the original spirit bard.



 

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FIELD: building materials, in particular concrete additives (plasticizer).

SUBSTANCE: method includes centrifugal preseparation of distillery dreg to provide concentrate, treatment obtained concentrate with alkali carbonate to pH 8-11, followed by addition of superplasticizer or lignosulfonate solution providing ratio of total amount of alkali carbonate and concentrate to amount of solution ‹1. Superplasticizer or lignosulfonate solution is added to obtained centrifuge effluent, providing ratio of centrifuge effluent to said solution from 0.2 to 2.0 to produce another plasticizer. Dry alkali carbonate content is not more than biomass content in raw distillery dreg. Method of present invention is useful in concrete mixtures manufacturing for producing of precast concrete and cast-in-place constructions.

EFFECT: concrete mixtures with controlled flow characteristic and concrete curing rate.

2 cl, 4 ex

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