KR100994335B1 - Manufacturing methods of water purification concrete using micro-organisms and solution - Google Patents

Abstract

PURPOSE: A manufacturing method of water-purifying concrete using microbial culture fluid is provided to improve the removal efficiency of water based pollutants by maintaining an odor reducing effect during a curing process of the concrete. CONSTITUTION: A manufacturing method of water-purifying concrete using microbial culture fluid comprises the following steps: preparing a molding product including 5.5~7.6% of binder, 61.3~79.6% of aggregate, 0.2~0.3% of admixture, 3.4~4.8% of microbe culture fluid, 4.3~5.1% of water, and the remainder of air; wet-curing the molding product inside a curing chamber with a humidity of 80~90% at 10~50deg C; and curing the molding product for 7~30 days at room temperature.

Description

Manufacturing Method of Water Purification Concrete using Micro-Organisms and Solution

The present invention is the blast furnace slag powder and slag aggregate, fly ash and bottom ash, fly ash and bottom ash, volcanic ash and odor removal, the adsorption and decomposition of toxic substances, antibacterial action, and the strong alkali and curing process of concrete The effect of eliminating water pollutants such as nitrogen and phosphorus is greater than that of conventional water purification concrete by mixing appropriate amount of culture medium that selectively cultured microorganism with little influence on the change of growth environment according to the change of temperature It relates to a method for producing water purification concrete having a water purification function.

Technology related to the manufacturing method and composition of concrete products having water purification function using recycled aggregates, 'eco-friendly concrete for water purification using recycled aggregates' that has water purification function by forming appropriate voids (Korea Patent Publication) 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) have been published.

Such techniques have been made to have a water purification function using internal pores by optimizing the porosity, 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, recent environmental issues caused by contaminants generated from recycled aggregates or waste concrete have been raised, causing considerable time and economic consumption to reprocess such recycled aggregates or waste concrete.

In particular, when exposed to contaminated acidified moisture such as reclaimed aggregates or waste concrete, which is mainly recycled, such as rafts and artificial reefs, when sulfate ions move inside and supersaturate, monosulfate becomes roughened by ethrinite. 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 No.) has been filed, and 'Method for manufacturing water quality concrete' (Korea Patent Publication No. 10-0840602), which is a method of producing concrete that adds useful microorganisms to concrete and performs water purification activities such as rivers and lakes, is applied. However, the 'antimicrobial antimicrobial ready-mixed concrete' is known to have only the function of air purification and indoor environment improvement.In fact, when the useful microorganisms are applied to concrete, microorganisms are affected by the high temperature and strong alkalinity in the curing process of concrete. It is very difficult to die, or to reduce the amount of microorganisms, to achieve the desired purpose. In the case of the 'preparation method of concrete for water purification', the removal effect of water pollutants such as nitrogen and phosphorus is not great and the effect is not made for a long time. There is a limit to this.

Therefore, the efficiency of water removal of water pollutants such as nitrogen and phosphorus is high, the effect lasts for a long time, and the water quality using microbial culture liquid as a way to maintain the strength and durability of other eco-friendly properties and the basic physical properties of concrete. The present invention has been applied for a method of manufacturing concrete for purification.

KR, 10-0508881, 2005.08.09 KR, 10-0582770, 2006.05.16 KR, 10-0632976, September 29, 2006 KR, 10-0840602, 2008.06.17

The method for producing water-purified concrete using the microorganism culture medium of the present invention was invented to solve the above problems occurring in concrete prepared using the above-mentioned conventionally useful microorganisms. The present invention aims to provide a method for producing water-purifying concrete that has high efficiency in removing water pollutants such as nitrogen and phosphorus in seawater such as coasts, which lasts for a long time, and is easy to grow and grow various organisms.

More specifically, the culture medium which selectively cultivated microorganisms excellent in removing odor, adsorption and decomposition of harmful substances, and antibacterial effect and having little influence on growth environment due to temperature change according to strong alkalinity and curing process of concrete. It can be used for environmentally friendly properties such as water purification, which can be maintained for a long time and additionally prevent secondary pollution due to the material used in concrete, and increase the strength and durability of concrete. To make it work.

In addition, slag powder, slag aggregate, and volcanic stone are being produced in large quantities in industrial sites such as fly ash, bottom ash, and steel mills, which are increasing every year due to the recent increase in electric power demand and dependence on coal-fired power plants. By using and volcanic ash, it is effectively recycled as a high value-added material and performance enhancing element for concrete such as river water purification blocks, water pipes, manholes, culverts, etc. to prevent depletion of natural resources, water purification for rivers, and water quality for living and growing It is to provide a method for producing purified concrete.

In order to solve the above problems, the method for producing water-purified concrete using the microbial culture medium of the present invention, the method for producing water-purified concrete using the microbial culture medium of the present invention, the binder composition of 5.5 ~ 7.6% of the total volume of the molding composition and , 61.3-79.6% aggregate of the total volume of the molding composition, 0.2-0.3% of admixture of the total volume of the molding composition, 3.4-4.8% of selectively cultured microbial culture medium and 4.3-5.1 of the total volume of the molding composition. A mixing step of preparing a molding composition comprising air as the remaining amount of water and%; Consists of curing the molding composition at a humidity of 80 ~ 90%, temperature 10 ~ 50 ℃ conditions in the curing room for 12 to 24 hours, curing for 7 to 30 days at room temperature in a dry state; It is configured to include.

At this time, the microbial culture is characterized in that the mixture of the microorganism and the culture in a weight ratio of 1: 2.

In addition, the aggregate is characterized in that consisting of one or two to four selected from the recycled concrete recycled aggregate, crushed stone, bottom ash, slag aggregate, volcanic stone.

In addition, the binder is characterized in that consisting of one or two to four selected from cement, fly ash, slag powder, blast furnace slag powder.

According to the present invention, the removal efficiency of water pollutants such as nitrogen and phosphorus is large and lasts for a long time, and it is excellent in removing odors, adsorption and decomposition of harmful substances, and antibacterial activity, according to the strong alkalinity and curing process of concrete. Hazardous substances contained in waste concrete, slag aggregate, bottom ash and general concrete do not contaminate the aquatic environment by using a culture medium selectively cultured microorganisms with little influence on the change of growth environment according to the change of temperature.

In addition, it has better performance than existing water purification concrete in the early stage of concrete installation and has excellent water purification function for a long time, as well as resistance to strong alkalinity generated during curing of concrete and temperature change during curing process. By adapting and providing the requirement for microorganisms to maintain and live, the odor removal of microorganisms, adsorption and decomposition of harmful substances, and antibacterial activity are maintained even after the manufacture of concrete.

In addition, fly ash, bottom ash, blast furnace slag powder and slag aggregate, and volcanic stone, which are generated in coal-fired power plants and steel mills, etc., may be usefully used as performance enhancing factors to prevent depletion of natural resources.

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

1 is a process chart showing a method for producing water-purified concrete using a microbial culture medium of the present invention.

As a specific means for achieving the above object, the method for producing water-purified concrete using the microbial culture medium of the present invention, the method for producing water-purified concrete using the microbial culture medium of the present invention is 5.5 to 7.6% of the total volume of the molding composition. Binder, 61.3-79.6% aggregate of the total volume of the molding composition, 0.2-0.3% of admixture of the total volume of the molding composition, 3.4-4.8% of selectively cultured microbial culture medium and the total volume of the molding composition. A mixing step of preparing a molding composition including air as water and a residual amount of 5.1%; Consists of curing the molding composition at a humidity of 80 ~ 90%, temperature 10 ~ 50 ℃ conditions in the curing room for 12 to 24 hours, curing for 7 to 30 days at room temperature in a dry state; It is configured to include.

Hereinafter will be described in detail with reference to the accompanying drawings for the production method of water purification concrete using the microbial culture medium of the present invention.

1 is a process chart showing a method for producing water-purified concrete using the microbial culture medium of the present invention using a microbial culture medium.

1. Mixing Step

A molding composition is prepared by mixing a binder, aggregate, admixture, microbial culture, water and air.

The binder is characterized in that it comprises 5.5 to 7.6% of the total volume of the molding composition.

At this time, the binder is composed of one or two or three selected from cement, fly ash, slag powder.

A more preferable composition of the binder may be formed by mixing cement and blast furnace slag powder, or by mixing cement and fly ash.

At this time, the blast furnace slag powder and fly ash added together with the cement is preferably mixed 1 to 30 parts by weight relative to 100 parts by weight of cement.

Aggregate is characterized in that it comprises 61.3 ~ 79.6% in the total volume of the molding composition.

Aggregate may be used as a general aggregate, it is preferable to use one or a mixture of 2 to 5 selected from waste concrete recycled aggregate, crushed stone, bottom ash, slag aggregate, volcanic stone.

The admixture is characterized in that it comprises 0.2 to 0.3% of the total volume of the molding composition.

The admixture may be a mixture of a dispersant, a fatty acid metal salt, silica, an accelerator, a plasticizer, and a surfactant as appropriate.

Useful microorganism culture medium contains 3.4 ~ 4.8% of the total volume of the molding composition, and it is excellent in removing odor, adsorption and decomposition of harmful substances, and antibacterial activity, and the growth environment according to the temperature change according to the strong alkalinity and curing process of concrete. As a culture medium selectively cultured microorganisms with little change, it is preferable to mix basophilic microorganisms of the bacillus firmus system and the culture solution in a weight ratio of 1: 2.

In the mixing step, all the materials may be mixed together all at once, but the most preferred method is to mix the aggregate and the microbial culture in advance for 5 to 10 minutes in advance and then it is most preferable to mix with other materials.

2. Curing stage

The molding composition formed in the mixing step is wet cured in a curing room for 12 to 24 hours at a humidity of 80 to 90% and a temperature of 10 to 50 ° C., and then cures about 5 to 10 days at room temperature in a dry state.

At this time, in order to form a molding composition in a certain shape according to the characteristics of the product, after preparing a molding die of various shapes, the material is put into the molding mold and cured.

Hereinafter, an example and a comparative example will be described with reference to a method for producing water-purified concrete using the microbial culture medium of the present invention.

Example 1 Water Purification Concrete 1 Using Microbial Culture Solution

98 l of cement was prepared as a binder, and aggregates 796 l of crushed aggregate and 3 l of admixture were prepared.

The microbial culture medium is excellent in removing odor, adsorption and decomposition of harmful substances, and antimicrobial activity, and selectively cultured microorganisms that have little effect on the growth environment due to the strong alkalinity of concrete and the temperature change according to the curing process. Was prepared by mixing the weight ratio of 1: 2 and 34ℓ, and after preparing 51L of water, the prepared aggregate and the microbial culture solution were pre-mixed for 5 minutes, and then mixed with a binder, admixture and water, and then put into a molding mold, and then the humidity of about 80 ~ After wetting and curing for 18 hours in a curing room at 90% and a temperature of 20-25 ° C., water was cured at room temperature for 7 days to prepare water-purified concrete.

Example 2 Water Purification Concrete 2 Using Microbial Culture Solution

Proceed in the same manner as in Example 1, 91L of cement and 7L of fly ash were prepared as a binder, and aggregate was prepared with 796L of crushed aggregate and 3L of admixture to prepare water-purified concrete.

Example 3 Water Purification Concrete 3 Using Microbial Culture Solution

Proceeded in the same manner as in Example 1, 76L cement and 7L fly ash, 15L slag powder was prepared as a binder, and the aggregate was prepared by crushing aggregate 796L, admixture 3L to prepare water-purified concrete.

Example 4 Water Purification Concrete 4 Using Microbial Culture Solution

Proceed in the same manner as in Example 1, 91L of cement and 7L of fly ash were prepared as a binder, aggregate was prepared of 796L of crushed aggregate, 3L of admixture, and 48L of microbial culture was prepared to prepare water-purified concrete.

Example 5 Water Purification Concrete Using Microbial Culture Solution 5

Proceed in the same manner as in Example 4, 76L of cement, 7L of fly ash, 15L of slag fine powder were prepared as a binder, and aggregate was prepared with 796L of crushed aggregate and 3L of admixture to prepare water-purified concrete.

The comparative example was prepared under the following conditions according to the 'preparation method for water purification concrete' (Korean Patent Publication No. 10-0840602), which is a method for producing concrete having a water purification function.

Comparative Example 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, After preparing the molding composition by mixing the useful microbial culture solution and water, the molding composition is injected into the molding mold, and then divided into layers every 10 to 30 cm in height with a vibration frequency of 110 to 130 Hz, followed by steam curing in a curing room for 4 hours. The water purification concrete was prepared.

Comparative Example 2

Proceed in the same manner as in Comparative Example 1, but was prepared by mixing the cement 318.0kg and fly ash 24.0kg as a binder, the aggregate was prepared by mixing coarse aggregate 942.0kg and fine aggregate 862.0kg, and prepared admixture 1.7kg.

The useful microbial culture was prepared with the same weight, and water was prepared while preparing 127.4 kg of water-purified concrete.

Comparative Example 3

Proceed in the same manner as in Comparative Example 1, as a binder was prepared by mixing cement 213.0kg, fly ash 33.0kg, slag powder 82.0kg, aggregate was prepared by mixing coarse aggregate 888.0kg and fine aggregate 877.0kg, admixture 1.7kg Was prepared.

A total of 34.1 kg of useful microbial culture was prepared, and 142.9 kg of water was prepared to prepare water-purified concrete.

<Comparative Example 4>

Proceed in the same manner as in Comparative Example 1, but was prepared by mixing the cement 318.0kg and fly ash 24.0kg, the aggregate was prepared by mixing coarse aggregate 942.0kg and fine aggregate 862.0kg, and prepared admixture 1.7kg.

A total of 69.3 kg of useful microbial culture was prepared, and 92.7 kg of water was prepared to prepare water-purified concrete.

Comparative Example 5

Proceed in the same manner as in Comparative Example 1, but prepared by mixing 217.0kg cement and 35.0kg fly ash, 88.0kg slag powder as a binder, the aggregate is prepared by mixing 895.0kg coarse aggregate and 854.0kg fine aggregate, 1.8kg admixture Was prepared.

A total of 68.1 kg of useful microbial culture was prepared, and 110.9 kg of water was prepared to prepare water-purified concrete.

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

The water-purifying concretes of Examples 1 to 5 and Comparative Examples 1 to 5 were prepared in a horizontal, vertical 30 cm, and 10 cm height, and the ammonium chloride and the agent were prepared so that carbon: nitrogen: phosphorus was 150: 50: 1 at the age of 28 days. It is installed in a circulating water circulating channel of artificial sewage adjusted by adjusting the composition ratio of sodium diphosphate, etc., and it circulates at a flow rate of 20 ml per minute, and the sunshine condition is similar to that of the outdoor environment. Total nitrogen content (TN) and total phosphorus of water purified by comprehensive water quality meter on day 1, 10, 50, 100, 200, 400 and 600 days in a constant temperature room kept at 20 ± 2 ℃ (TP) was measured.

The artificial sewage was divided into seawater and fresh water, and the test was carried out. In the case of seawater, salt concentration was adjusted using sea salt with seawater, and distilled water was supplemented to maintain a certain amount of artificial sewage to reduce errors caused by evaporation. .

Ammonium chloride
(NH ₄ Cl) 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

Table 1 is a table showing the components of artificial sewage.

compare
object Elimination Rate According to Elapsed Days 1 day 10 days 50 days 100 days 200 days 400 days 600 days T-N T-P T-N T-P T-N T-P T-N T-P T-N T-P T-N T-P T-N T-P Example 1 68.3 46.2 74.6 80 75.1 77.6 80.7 83.6 83.4 84.6 86.1 86.1 85.4 85.4 Comparative Example 1 56 28 69 38 73 56 79.4 68 89 79 72 64 28 18 Example 2 63.1 45.3 72.8 76 73.4 80.5 76.9 79.8 84.5 86.7 83.3 84.9 82.5 84.7 Comparative Example 2 52.2 27.2 68 37 55 52 80 65 87 80 63 54 23 15 Example 3 68 48.5 70.8 76 73.4 76 78.7 82.2 81.3 81.1 84.2 87.5 82.7 86.6 Comparative Example 3 53 25.6 66 41.3 69.5 52.9 75.3 66 86 73.5 71 60.5 25 16 Example 4 65 44 66.7 74.1 72.5 84.2 80.7 84 83 85.2 84.5 90.3 87.1 89 Comparative Example 4 52 19 54 25.1 59 42 64 54 76 63 64 51 19 11 Example 5 64 40.9 72.2 77.6 71.3 82.9 80 84.6 84.7 83.4 81.6 87.5 82.6 88 Comparative Example 5 51 23 64 30.9 66 44 71.3 61 84 75 68 53 21 14

Table 2 shows the results of water quality test in fresh water, the unit of scavenging rate is (%).

compare
object Elimination Rate According to Elapsed Days 1 day 10 days 50 days 100 days 200 days 400 days 600 days T-N T-P T-N T-P T-N T-P T-N T-P T-N T-P T-N T-P T-N T-P Example 1 24.5 21.7 34.0 31.6 39.2 41.0 39.6 42.0 38.7 46.0 42.5 44.3 44.0 50.0 Comparative Example 1 3.3 5.2 5.7 5.7 5.7 4.7 6.6 4.7 5.7 8.0 9.0 8.5 9.0 9.0 Example 2 27.3 25.6 31.7 30.6 41.4 44.2 42.5 44.7 43.3 49.2 46.4 49.4 48.9 51.2 Comparative Example 2 3.2 5.1 4.6 5.6 5.1 6.0 6.5 3.2 5.1 7.4 8.0 8.0 6.5 8.8 Example 3 33.4 32.0 41.0 36.8 42.0 40.5 42.2 41.0 45.8 42.2 47.3 45.6 47.5 53.5 Comparative Example 3 7.5 8.5 7.1 4.2 6.0 2.8 7.1 4.2 6.6 3.3 5.2 4.7 6.6 5.7 Example 4 36.7 34.0 40.7 37.5 43.7 43.6 48.8 44.9 48.6 48.3 48.3 51.4 51.4 55.8 Comparative Example 4 6.5 5.1 8.0 6.9 6.9 4.0 7.4 6.0 3.7 4.0 6.0 4.6 7.4 4.0 Example 5 36.8 35.4 44.0 38.7 45.6 47.0 44.2 48.4 47.5 50.9 52.0 55.7 53.8 56.6 Comparative Example 5 7.1 5.2 6.6 4.7 6.6 5.7 8.0 6.0 6.6 5.2 8.0 5.7 5.7 7.1

Table 3 shows the results of water quality test in seawater, the unit of scavenging rate is (%).

As a result of measuring the total nitrogen and total phosphorus reduction in artificial sewage in freshwater with artificial sewage components as shown in Table 1, the total nitrogen reduction in elapsed time was 54 to 69%, The decrease in phosphorus was found to be in the range of 25.1 to 41.3%, but in the case of embodiments, the decrease in total nitrogen when the elapsed time was 10 was 66.7 to 74.6% and the decrease in total phosphorus was in the range of 74.1 to 80%. Compared to the comparative examples in the early days, the total nitrogen and total phosphorus decrease is larger than the comparative examples, it is judged that the effect of water purification from the beginning of the installation when applying the stream and appeal.

In addition, in the comparative examples, the amount of decrease in total nitrogen amount in the elapsed time of 200 was 84 to 89%, and the amount of decrease in total phosphorus was 63 to 80%. The decrease in total phosphorus was 19 to 28% and the total phosphorus was in the range of 11 to 18%. After 200 days, the decrease in total nitrogen and total phosphorus was reduced, but in the case of the embodiment, the amount of total nitrogen when the elapsed time was 200 The decrease amount was 81.3 ~ 84.7%, the decrease in total phosphorus ranged from 81.1 to 86.7%, and the decrease in total nitrogen amount was 82.6 ~ 87.1% and the decrease in total phosphorus amount was 84.7 ~ 89% when the elapsed time was 600 days. As a result, the decrease in total nitrogen and total phosphorus was maintained after 200 days.

In addition, as a result of measuring the total nitrogen and total phosphorus decrease in the artificial sewage in seawater having the components of artificial sewage as shown in Table 1, in the comparative examples, the decrease in total nitrogen amount when the elapsed time was 10 was 4.6 to 8.6%. The decrease in total phosphorus ranged from 4.2 to 5.7%, but in the case of embodiments, the decrease in total nitrogen at elapsed time ranges from 31.7 to 44.0% and the decrease in total phosphorus ranges from 31.6 to 38.7%. In the early days of the elapsed days, the total nitrogen and the total phosphorus decreased significantly compared to the comparative examples.

Moreover, as the elapsed time, the total nitrogen and phosphorus changes of the comparative examples showed a similar tendency as the first time, but the examples showed that the total nitrogen reduction amount at 200 was 38.7 to 48.6%, and the total phosphorus reduction amount was 42.2 to 50.9. In the case of the elapsed time of 600 days, the decrease in total nitrogen was 44.0 ~ 53.8% and the decrease in total phosphorus was large.

Therefore, the embodiments are superior to the comparative examples in water quality purification effect in the sea, it is judged that the use is acceptable not only in fresh water but also in sea water.

Therefore, the concrete produced by the present invention compared to the manufacturing method according to the latest 'method for producing water purification concrete' (Korea Patent Publication No. 10-0840602), which is a state-of-the-art technology for producing concrete for water purification, has shown that the concrete produced by the present invention has an initial period of time and a long term performance. It was found to be excellent.

In addition, when applying the new structure proposed by the present invention as described above, when manufacturing the concrete products in contact with the waterfront, such as concrete construction for water purification of rivers, lakes, coasts and harbors in the early stages of installation and long-term It is expected to contribute to the prevention of environmental pollution and the creation of environment-friendly products by providing concrete products with excellent performance.

Experimental Example 2 Acid-Alkali Measurement

After the concrete of Examples 1 to 5 and Comparative Examples 1 to 5 were manufactured into columnar specimens having a diameter of 10 cm and a height of 20 cm, the curing was carried out in water, and then 30 ml of distilled water was sprayed on the specimens to determine the pH of the distilled water flowing out from the bottom. It was measured according to KS M 0011 'Method of measuring pH of aqueous solution' and is shown in Table 4.

Experimental Example 3 Strength Measurement

The concrete of Examples 1 to 5 and Comparative Examples 1 to 5 were prepared with specimens of the same form as Experimental Example 2, and the compressive strength was measured according to KS F 2405 'Concrete compressive strength test method' at 28 days of discretion. Indicated.

Experimental Example 4 Measurement of Flexural Strength

Test method of bending strength and flexural toughness of KCI-SF-104 'fibre-reinforced concrete at 28 days of age by preparing the concrete of Examples 1 to 5 and Comparative Examples 1 to 5 with a horizontal, vertical 15 cm, and 55 cm height specimens It measured according to 'and shown in Table 4.

Experimental Example 5 Chemical Resistance Experiment

The concrete of Examples 1 to 5 and Comparative Examples 1 to 5 were manufactured in columnar specimens having a diameter of 10 cm and a height of 20 cm and immersed in 1% sulfuric acid solution for up to 6 months of age to measure the weight change rate according to age. Shown in

Experimental Example 6 Freeze-thawing Experiment

The concrete of Examples 1 to 5 and Comparative Examples 1 to 5 were prepared as specimens having a width of 10 cm, a height of 40 cm, and a freeze thaw test at 28 days of age to measure the appearance and strength change after 300 cycles. Indicated.

comparison target Alkali elution (pH) Compressive strength Flexural strength Acid resistance Freeze thaw resistance Example 1 8.9 32.8 6.6 Great Great Comparative Example 1 9.5 29.4 5.7 Great Great Example 2 8.7 34.3 6.7 Great Great Comparative Example 2 9.6 31.1 5.8 Great Great Example 3 8.3 29.7 6.3 Great Great Comparative Example 3 9.1 26.6 4.9 Great Great Example 4 8.1 37.4 7.1 Great Great Comparative Example 4 8.9 33.3 6.2 Great Great Example 5 8.0 33.9 6.4 Great Great Comparative Example 5 8.7 30.1 5.6 Great Great

Table 4 is an experimental result of Experimental Examples 2 to 6, the compressive strength and the flexural strength is MPa.

Analyzing Table 4, the comparative examples showed a weak alkalinity in the case of alkali elution amount of 8.7 to 9.5, but was close to neutral at 8.0 to 8.9 for the water purification concrete according to the present invention.

In addition, it can be seen that even in the case of compressive strength and flexural strength, the embodiments are increased by about 10.2 to 28.5% compared to the comparative examples.

In addition, the results of the acid resistance and freeze thaw resistance test results showed that both the comparative examples and the examples have excellent durability.

Claims (4)

In the manufacturing method of concrete,
5.5 to 7.6% binder in the total volume of the molding composition, 61.3 to 79.6% aggregate in the total volume of the molding composition, 0.2 to 0.3% admixture in the total volume of the molding composition, and 3.4 to 4.8% microorganisms in the total volume of the molding composition. Mixing step of preparing a molding composition comprising the culture medium and the air and the remaining amount of 4.3 ~ 5.1% of the total volume;
Consists of curing the molding composition in the condition of humidity 80 ~ 90%, temperature 10 ~ 50 ℃ wet curing in the curing room for 12 to 24 hours, and curing for 7 to 30 days at room temperature in air condition;
The microbial culture medium is mixed with the microorganism and the culture medium in a weight ratio of 1: 2,
The aggregate is composed of one or two to five kinds of waste concrete recycling aggregate, crushed stone, bottom ash, slag aggregate, volcanic stone selected from,
The binder is characterized by consisting of a mixture of cement, fly ash, slag powder, blast furnace slag fine powder or one or two to four kinds,
Method for producing water purification concrete using microbial culture medium. delete delete delete

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