KR100840602B1 - Manufacturing method of concrete for purifying water - Google Patents

Abstract

A method for manufacturing concrete for water purification is provided to produce the concrete having a water purification function, high strength and durability, and good chemical resistance and freezing and thawing resistance. A method for manufacturing concrete for water purification includes the steps of: preparing a composition containing 14.8-15.2wt% of a binder, 76.6-78.4wt% of aggregate, 0.07-0.08wt% of an admixture, 0.3-3wt% of a useful microorganism culture solution, and the balance of water, based on the total weight of the composition; charging the composition into a mold, and ramming the charged composition down to obtain a molded material using a vibrator; and vacuum-curing the molded material in a curing room for 3-8 hours, or naturally curing the molded material at ambient temperature for 24-72 hours. Further, the culture solution, bacillus, Lactobacillus and Saccharomyces are mixed at a weight ratio of 1:3:3:3.

Description

MANUFACTURING METHOD OF CONCRETE FOR PURIFYING WATER}

The present invention relates to a method for producing concrete for water purification, which has a water purification function by mixing an appropriate amount of waste concrete recycled aggregate, blast furnace slag fine powder, fly ash and useful microbial culture medium.

Technology related to the manufacturing method and composition of concrete products having water purification function using recycled aggregates, etc., is an eco-friendly concrete for water purification using recycled aggregates, which has a water purification function by applying the proper porosity to form appropriate pores. (Korean Registered Patent Publication No. 10-0508881) has been published.

In addition, 'a method for producing eco-friendly high-performance concrete using waste concrete fine powder and recycled aggregates and industrial by-products and eco-friendly retaining wall blocks manufactured by using the high-performance concrete with a large number of voids to have a water purification function' (Korea Registered Patent Publication) 10-0582770) has been published.

The above techniques are to optimize the porosity to have a water purification function by using the internal pores, which will be related to the filtration technology.

The above technologies have a positive aspect of resource recycling by using recycled aggregates or waste concrete, but there is a problem that the harmful substances contained therein can contaminate groundwater, seawater, and soil.

As a result, recently, environmental problems due to pollutants generated from recycled aggregates or waste concrete have been raised, causing considerable time and economic consumption in reprocessing such recycled aggregates or waste concrete.

In particular, when exposed to contaminated acidified water such as reclaimed aggregates or waste concrete, which are mainly recycled, such as raft blocks and artificial reefs, when sulfate ions move inside and supersaturate, monosulfate changes to ethrinite, resulting in rough tissue. Cracks occur, and there is a problem such as to accelerate the intrusion of corrosive substances to shorten the life of the concrete.

On the other hand, 'environmental antimicrobial ready-mixed concrete' to improve indoor environment by adding useful microorganisms in concrete manufacturing to improve antibacterial and deodorizing ability and block harmful microbial forms of concrete description (Korea Patent Publication No. 10-0632976 Has been filed, but this technique is only known for its functions of air purification and indoor environment improvement.

The method for producing concrete for water purification of the present invention is to solve the problems occurring in the water purification concrete using the conventional recycled aggregate or waste concrete as described above, and regenerates using useful microorganisms excellent in antioxidant activity, antibacterial action, and adsorption of harmful substances. It is intended to prevent harmful substances contained in aggregate, waste concrete and general concrete from polluting the aquatic environment.

Furthermore, it is to provide a composition for producing concrete for water purification and a method for producing concrete for water purification that can purify water quality using useful microorganisms.

In addition, to have a water purification function as well as to increase the strength and durability even when using recycled aggregates or waste concrete.

In addition, fly ash and blast furnace slag powder generated from coal-fired power plants and steel mills are usefully used as performance enhancing factors to prevent depletion of natural resources.

In addition, the present invention aims to provide concrete having high chemical resistance and high freeze-thawing resistance.

The composition for producing concrete for water purification of the present invention, in order to solve the above problems, 14.8 ~ 15.2% of the total weight of the composition of the binder; Aggregates with 76.6-78.4% of the total weight of the composition; 0.07 to 0.08% of a total weight of the composition; 0.3 to 3% of the useful microorganism culture medium of the total weight of the composition; It comprises a residual amount of water;

At this time, the useful microbial culture is characterized in that the culture solution, Bacillus, Lactobacillus bacteria, Saccharomyces bacteria mixed in a weight ratio of 1: 3: 3: 3.

In addition, the aggregate is characterized by using any one of the recycled concrete recycled aggregate, crushed stone, or a mixture of waste concrete recycled aggregate and crushed stone.

In addition, the binder is characterized in that one or a mixture of two or three selected from cement, fly ash, slag powder.

In addition, the binder is one or two selected from a mixture of cement and blast furnace slag powder or a mixture of cement and fly ash, the blast furnace slag powder and fly ash is characterized in that 1 to 30% mixed with the cement, respectively.

On the other hand, concrete manufacturing method for water purification of the present invention, the composition preparation step of preparing the concrete composition; Molding the composition by putting the composition into a molding mold, and molding the divided parts into layers every 10 to 30 cm in height at a frequency of 110 to 130 Hz with a vibrator; It is configured to include; a curing step of curing the molded product prepared in a curing room for 3 to 8 hours or natural curing at room temperature for 24 to 72 hours.

According to the present invention, using the useful microorganisms excellent in the antioxidant action, antibacterial action, adsorption of harmful substances, harmful substances contained in recycled aggregates, waste concrete, and general concrete do not contaminate the underwater environment.

Furthermore, there is provided a composition for producing concrete for water purification and a method for producing concrete for water purification that can purify water quality using useful microorganisms.

In addition, as well as having a water purification function, it is possible to increase the strength and durability even when using recycled aggregates or waste concrete.

In addition, fly ash and blast furnace slag powder generated in coal-fired power plants and steel mills, etc. can be usefully used as performance enhancing factors, thereby contributing to preventing the depletion of natural resources.

In addition, concrete having high chemical resistance and high freeze-thawing resistance is provided.

Composition for producing concrete for water purification of the present invention, the binder 14.8 ~ 15.2% of the total weight of the composition; Aggregates with 76.6-78.4% of the total weight of the composition; 0.07 to 0.08% of a total weight of the composition; 0.3 to 3% of the useful microorganism culture medium of the total weight of the composition; It comprises a residual amount of water;

Hereinafter, each component of the composition for producing concrete for water purification of the present invention will be described in detail.

Composition for producing concrete for water purification of the present invention comprises a binder, aggregate, admixture, useful microbial culture and the remaining amount of water.

The binder comprises 14.8 to 15.2% of the total weight of the composition, and consists of one or two or three selected from cement, fly ash, slag powder.

In addition, the binder is one or two selected from a mixture of cement and blast furnace slag powder or a mixture of cement and fly ash, the blast furnace slag powder and fly ash is preferably 1 to 30% mixed with the cement, respectively.

Aggregate is included 76.6 ~ 78.4% of the total weight of the composition, it is also possible to use a general aggregate, it is preferable to use any one of the waste concrete recycled aggregate, crushed stone, or a mixture of waste concrete recycled aggregate and crushed stone.

The admixture includes 0.07% to 0.08% of the total weight of the composition, and the admixture may be a mixture of a dispersant, a fatty acid metal salt, silica, an accelerator, a plasticizer, and a surfactant according to specifications.

The useful microorganism culture solution contains 0.3 to 3% of the total weight of the composition, and it is preferable that the culture solution, Bacillus bacteria, Lactobacillus bacteria and Saccharomyces bacteria are mixed in a weight ratio of 1: 3: 3: 3.

Hereinafter, a concrete manufacturing method for water purification using the composition will be described in detail.

1.Preparation Step

A composition having the composition ratio as described above is prepared.

2. Molding step

According to the characteristics of the product, various types of forming molds are prepared to manufacture revetment blocks, water pipes, manholes, culverts, and fish beds.

After preparing the mold, the composition is put into the mold, but the mold is divided into layers every 10 to 30 cm in height at a frequency of 110 to 130 Hz with a vibrator.

3. Curing stage

The molded product is filled into the mold to steam the curing in the curing room for 3 to 8 hours or natural curing at room temperature for 24 to 72 hours to produce a concrete product.

Hereinafter, the concrete production examples and comparative examples for water purification of the present invention will be described.

Example 1 Preparation of Concrete for Water Purification 1

Cement 344.0kg was prepared as a binder, aggregate was prepared by mixing coarse aggregate 942.0kg and fine aggregate 845.0kg, and prepared admixture 1.7kg.

Useful microbial cultures were prepared by mixing the culture solution, Bacillus, Lactobacillus, Saccharomyces in a weight ratio of 1: 3: 3: 3 and a total of 34.6kg, 136.4kg of water, and then prepared binder, aggregate, admixture, A useful microbial culture solution and water were mixed to prepare a composition for preparing concrete for water purification.

Example 2 Preparation of Concrete for Water Purification 2

As a binder, 318.0 kg of cement and 24.0 kg of fly ash were prepared, and aggregate was prepared by mixing coarse aggregate 942.0 kg and fine aggregate 862.0 kg, and prepared admixture 1.7 kg.

Useful microbial culture was prepared by mixing the culture solution, Bacillus, Lactobacillus, Saccharomyces in a weight ratio of 1: 3: 3: 3 and a total of 34.6kg, 127.4kg of water, and then prepared binder, aggregate, admixture, A useful microbial culture solution and water were mixed to prepare a composition for preparing concrete for water purification.

Example 3 Preparation of Concrete for Water Purification 3

As a binder, 213.0 kg of cement, 33.0 kg of fly ash, and 82.0 kg of slag powder were prepared. The aggregate was prepared by mixing 888.0 kg of coarse aggregate and 877.0 kg of fine aggregate, and preparing 1.7 g of admixture.

Useful microbial cultures were prepared by mixing the culture solution, Bacillus, Lactobacillus, Saccharomyces in a weight ratio of 1: 3: 3: 3 and a total of 34.1kg, 142.9kg of water, and then prepared binder, aggregate, admixture, A useful microbial culture solution and water were mixed to prepare a composition for preparing concrete for water purification.

Example 4 Preparation of Concrete for Water Purification 4

As a binder, 318.0 kg of cement and 24.0 kg of fly ash were prepared, and aggregate was prepared by mixing coarse aggregate 942.0 kg and fine aggregate 862.0 kg, and prepared admixture 1.7 kg.

Useful microbial culture was prepared by mixing the culture solution, Bacillus, Lactobacillus, Saccharomyces in a weight ratio of 1: 3: 3: 69.3kg, 92.7kg of water prepared binders, aggregates, admixtures, A useful microbial culture solution and water were mixed to prepare a composition for preparing concrete for water purification.

Example 5 Preparation of Concrete for Water Purification 5

As a binder, 217.0 kg of cement, 35.0 kg of fly ash, and 88.0 kg of slag fine powder were prepared, and aggregate was prepared by mixing 895.0 kg of coarse aggregate and 854.0 kg of fine aggregate, and preparing admixture 1.8 kg.

Useful microbial culture was prepared by mixing the culture solution, Bacillus, Lactobacillus, Saccharomyces in a weight ratio of 1: 3: 3: 68.1kg, 110.9kg of water prepared binder, aggregate, admixture, A useful microbial culture solution and water were mixed to prepare a composition for preparing concrete for water purification.

Comparative Example 1 Preparation of Concrete Containing No Useful Microorganisms 1

Prepare cement 344.0kg to compare with Example 1, the aggregate is prepared by mixing 942.0kg of coarse aggregate and 845.0kg of aggregate aggregate, preparing 1.7kg of admixture, 171.0kg of water prepared cement, aggregate, admixture , Water was mixed to prepare a comparative composition for concrete production.

<Comparative Example 2> Preparation of concrete containing no useful microorganisms 2

To compare with Example 2, cement 318.0kg, fly ash 24.0kg prepared, aggregate was prepared by mixing coarse aggregate 942.0kg and fine aggregate 862.0kg, prepared admixture 1.7kg, prepared after preparing water 162.0kg Cement, fly ash, aggregate, admixture, water were mixed to prepare a comparative composition for concrete production.

Comparative Example 3 Preparation of Concrete Containing No Useful Microorganisms 3

In order to compare with Example 3, 213.0 kg of cement, 33.0 kg of fly ash, 82.0 kg of slag powder are prepared, and the aggregate is prepared by mixing 888.0 kg of coarse aggregate and 877.0 kg of fine aggregate, and preparing admixture 1.7 kg, water 177.0 After preparing kg, prepared cement, fly ash, slag powder, aggregate, admixture, and water were mixed to prepare a comparative composition for concrete production.

<Comparative Example 4> Preparation of concrete containing no useful microorganisms 4

To compare with Example 4, cement 318.0kg, fly ash 24.0kg prepared, aggregate was prepared by mixing coarse aggregate 942.0kg and fine aggregate 862.0kg, prepared admixture 1.7kg, prepared water 162.0kg Cement, fly ash, aggregate, admixture, water were mixed to prepare a comparative composition for concrete production.

Comparative Example 5 Preparation of Concrete Containing No Useful Microorganisms 5

In order to compare with Example 5, 217.0 kg of cement, 35.0 kg of fly ash, 88.0 kg of slag powder are prepared, and aggregate is prepared by mixing 895.0 kg of coarse aggregate and 854.0 kg of fine aggregate, and preparing admixture 1.8 kg, water 179.0 After preparing kg, prepared cement, fly ash, slag powder, aggregate, admixture, and water were mixed to prepare a comparative composition for concrete production.

Table 1 is a comparison table showing the dosage of each component of the above embodiments and comparative examples

<Table 1> Input of each component of the Examples and Comparative Examples

comparison target water Binder aggregate Admixture Useful Microorganisms cement Fly ash Slag Powder Coarse aggregate Fine aggregate Example 1 171.0 344.0 - - 942.0 845.0 1.7 - Comparative Example 1 136.4 344.0 - - 942.0 845.0 1.7 34.6 Example 2 162.0 318.0 24.0 - 942.0 862.0 1.7 - Comparative Example 2 127.4 318.0 24.0 - 942.0 862.0 1.7 34.6 Example 3 177.0 213.0 33.0 82.0 888.0 877.0 1.7 - Comparative Example 3 142.9 213.0 33.0 82.0 888.0 877.0 1.7 34.1 Example 4 162.0 318.0 24.0 - 942.0 862.0 1.7 - Comparative Example 4 92.7 318.0 24.0 - 942.0 862.0 1.7 69.3 Example 5 179.0 217.0 35.0 88.0 895.0 854.0 1.8 - Comparative Example 5 110.9 217.0 35.0 88.0 895.0 854.0 1.8 68.1

Table 2 is a comparative table showing the water-binder ratio and binder replacement ratio, target slump and useful microbial culture use ratio of the concrete composition prepared by Examples 1 to 5 and Comparative Examples 1 to 5.

<Table 2 Useful Microorganism Usage and Binder Substitution Rate Comparison Table>

comparison target Water-binding Binding Replacement Rate Goal Slump Use of Microorganisms Fly ash Gorslag Powder Example 1 45% - - 120 - Comparative Example 1 1.5% Example 2 45% 7% - 120 - Comparative Example 2 1.5% Example 3 47.3% 10% 25% 150 - Comparative Example 3 1.5% Example 4 45% 7% - 150 - Comparative Example 4 3.0% Example 5 47.3% 10% 25% 150 - Comparative Example 5 3.0%

Referring to the experiments performed on the examples and comparative examples prepared as described above and the results are as follows.

Experimental Example 1 Water Purification Experiment

From the concrete composition of Examples 1 to 5 and Comparative Examples 1 to 5 to produce a plate-shaped specimen of width, length 30cm, height 10cm and chlorine so that carbon: nitrogen: phosphorus is 150: 50: 1 concentration from 28 days of age It is installed in a circulating water circulating channel of artificial sewage adjusted with the composition ratio of ammonium and sodium diphosphate, etc., and circulated at a flow rate of 20 ml per minute. Total nitrogen (TN) and total phosphorus (TP) of water purified by a comprehensive water quality meter at 1, 10, 50, 100 and 200 days in a constant temperature room maintained at 20 ± 2 ℃ In order to reduce the error caused by the evaporation of artificial sewage, distilled water was replenished to maintain a certain amount of artificial sewage.

Table 3 is a table showing the components of the artificial lake.

<Table 3> Table of Artificial Wastewater Components

Ammonium Chloride (NH4Cl) Dibasic sodium phosphate (Na ₂ HPO ₄ ) Potassium Chloride (Kcl) Sodium sulfate (NaSO ₄ ) 7.6 mg / l 1.8mg / l 1.6 mg / l 1.8mg / l

As a result of measuring total nitrogen and total phosphorus reduction in artificial sewage as shown in Table 4, when the elapsed time without useful microorganisms is 200 days, the amount of total nitrogen reduction is in the range of 11.2 ~ 18.4%, and the amount of total phosphorus decrease is Was found to range from 4.9 to 13%, but in the case of the use of useful microorganisms, the decrease in total nitrogen was 84 to 89% and the reduction in total phosphorus was 63 to 80%. It was found to be excellent.

<Table 4> Test result of water quality test

comparison target Elapsed time (days) One 10 50 100 200 T-N elimination rate (%) T-P erasure rate (%) T-N elimination rate (%) T-P erasure rate (%) T-N elimination rate (%) T-P erasure rate (%) T-N elimination rate (%) T-P erasure rate (%) T-N elimination rate (%) T-P erasure rate (%) Example 1 23.3 10.3 19. 9.4 17. 2.7 15.7 2.7 11.2 4.9 Comparative Example 1 56. 28 69 38 73 56 79.4 68 89 79 Example 2 16.2 5.3 17.3 7.3 16.3 6.2 16.5 6.3 12.1 5.1 Comparative Example 2 52.3 27.2 68 37 55 52 80 65 87 80 Example 3 16.8 5.9 19.3 6.1 17. 5 17 5.4 13 6.7 Comparative Example 3 53 25.6 66 41.3 69.5 52.9 75.3 66 86 73.5 Example 4 20.6 9 21.5 11.2 19.7 6.7 18.8 9. 15.2 10 Comparative Example 4 52 19 54 25.1 59 42 64 54 76 63 Example 5 14 4.5 15.7 8 23.3 9.4 21.1 11.2 18.4 13 Comparative Example 5 51 23 64 30.9 66 44 71.3 61 84 75

Based on the experimental results, when using the concrete composition of the present invention when manufacturing a concrete product in contact with the waterfront such as river construction, it is judged that it can greatly contribute to the prevention of environmental pollution and environmentally friendly composition compared to the conventional concrete composition.

Experimental Example 2 Slump and Air Volume Measurement

In the process of manufacturing the Examples 1 to 5 and Comparative Examples 1 to 5 were taken a sample of the solidified state and the slump and the amount of air was measured according to the KS standards are shown in Table 5.

Experimental Example 3 Acid-Alkali Measurement

The cylindrical compositions of 10 cm in diameter and 20 cm in height were prepared from the concrete compositions of Examples 1 to 5 and Comparative Examples 1 to 5, and cured under water until a predetermined age, followed by spraying 30 ml of distilled water on the upper part of the specimen and flowing to the lower part. The pH of the distilled water was measured according to KS M 0011 'Method of measuring pH of aqueous solution' and is shown in Table 5.

Experimental Example 4 Strength Measurement

Prepare the specimen of the same form as Experimental Example 2 from the concrete composition of Examples 1 to 5 and Comparative Examples 1 to 5 and measure the compressive strength according to KS F 2405 'Concrete compressive strength test method' at 28 days discretion Shown in

Experimental Example 5 Measurement of Flexural Strength

Flexural strength and flexural toughness test of KCI-SF-104 'fibre-reinforced concrete at 28 days of age were prepared using the concrete compositions of Examples 1 to 5 and Comparative Examples 1 to 5 to prepare a specimen of width 15 cm and height 55 cm. It was measured according to the 'method and shown in Table 5.

Experimental Example 6 Chemical Resistance Experiment

The cylindrical compositions of 10 cm in diameter and 20 cm in height were prepared using the concrete compositions of Examples 1 to 5 and Comparative Examples 1 to 5, and immersed in 1% sulfuric acid solution until the age of 6 months to measure the weight change rate according to age. 5 is shown.

Experimental Example 7 Freeze-thawing Experiment

The specimens of Examples 1 to 5 and Comparative Examples 1 to 5 were used to prepare specimens having a width of 10 cm and a height of 40 cm to perform freeze-thawing experiments at 28 days of age to measure the appearance and strength change after 300 cycles. Shown in

<Table 5> Concrete test results using useful microorganisms

comparison target Slump (mm) Air volume Alkali elution (pH) Compressive strength Flexural strength Acid resistance Freeze thawing experiment Example 1 120 4.6 13.2 27.3 5.1 usually usually Comparative Example 1 150 5.4 9.5 29.4 5.7 Great Great Example 2 120 4.7 13.1 28.4 5.4 usually usually Comparative Example 2 170 5.6 9.6 31.1 5.8 Great Great Example 3 155 4.7 12.9 23.7 4.5 usually usually Comparative Example 3 190 5.4 9.1 26.6 4.9 Great Great Example 4 160 4.4 12.7 28.5 5.4 Great usually Comparative Example 4 190 6.0 8.9 33.3 6.2 Great Great Example 5 160 4.2 12.8 28.8 5.5 Great usually Comparative Example 5 170 5.6 8.7 30.1 5.6 Great Great

Analysis of Table 5 shows that the slump in the case of using the useful microorganism is about 30 to 70 mm larger than the target slump, and about 0.7 to 1.6 in the case of the air volume, and the amount of the useful microorganism and the amount of fly ash and the slag fraction As the substitution rate increased, the slump and air volume increased.

In the case of alkali elution of concrete using useful microorganisms, the pH was 8.7 ~ 9.5, and the alkalinity was low. As the replacement rate of fine powder increased, pH tended to decrease.

In the case of compressive strength and flexural strength, it was shown to be improved by 7.3 ~ 15.6% compared to concrete mixture without using microorganisms.

In addition, the acid resistance and freeze-thaw resistance test results showed that it has excellent durability compared to the general concrete, it can be applied as a concrete product even in the case of using a useful microorganism.

In addition, in the production of concrete using the composition of the embodiment of the present invention, by molding the composition into a molding mold, but the composition is evenly mixed when molding divided into layers every 10 to 30cm in height at a frequency of 110 ~ 130Hz with a vibrator It was confirmed that the durability was improved and the uniform quality.

In addition, curing was preferably steam curing in the curing room for 3 to 8 hours or natural curing at room temperature for 24 to 72 hours.

The composition for producing concrete for water purification of the present invention configured as described above and the concrete prepared using the composition is molded into various concrete products such as water pipes, manholes and rock or reefs in contact with water, and water tanks, for the purpose of water purification. Will be used.

1 is a process showing a composition for producing concrete for water purification of the present invention and a concrete manufacturing method using the composition.

Claims (10)

delete delete delete delete delete In the concrete manufacturing method for water purification, 14.8-15.2% binder of the total weight of the composition, 76.6-78.4% aggregates of the total weight of the composition, 0.07-0.08% admixture of the total weight of the composition, 0.3-3% useful microbial culture of the total weight of the composition, A composition preparation step of preparing a composition comprising a residual amount of water; Molding the composition by putting the composition into a molding mold, and molding the divided parts into layers every 10 to 30 cm in height at a frequency of 110 to 130 Hz with a vibrator; It comprises a curing step of curing the molded product prepared in a curing room for 3 to 8 hours by steam or curing at room temperature for 24 to 72 hours. Method for producing concrete for water purification. The method of claim 6, The useful microorganism culture medium, characterized in that the culture solution, Bacillus bacillus, Lactobacillus bacteria, Saccharomyces bacteria is mixed in a weight ratio of 1: 3: 3: 3, Method for producing concrete for water purification. The method of claim 6, The aggregate is characterized in that any one of waste concrete recycled aggregate, crushed stone, or a mixture of waste concrete recycled aggregate and crushed stone, Method for producing concrete for water purification. The method of claim 6, The binder is characterized in that the mixture of one or two or three selected from cement, fly ash, slag powder, Method for producing concrete for water purification. The method of claim 6, The binder is one or two selected from a mixture of cement and blast furnace slag powder or a mixture of cement and fly ash, Blast furnace slag powder and fly ash, respectively, characterized in that 1 to 30% mixed with the cement, Method for producing concrete for water purification.

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