KR101429463B1 - Composition for Concrete Block - Google Patents

Abstract

The present invention relates to a composition for manufacturing a concrete block and, more specifically, to a composition for manufacturing a concrete block which comprises a crushed rock or concrete waste recycled coarse aggregate having the particle size of 5 mm or greater, sand or concrete waste recycled fine aggregate having the particle size of 5mm or less, a binder, a microorganism mixing solution, and an admixture.

Description

[Composition for Concrete Block]

The present invention relates to a composition for producing a concrete block. More particularly, the present invention relates to a composition for producing a concrete block comprising a microorganism for sewage treatment and an ion exchange material.

Rivers have served as centers of human life and culture for many years, and are natural resources with important environmental and ecological values. Recent changes in the perception of the value of rivers and the need to change the direction of the river maintenance to clean the polluted rivers and restore various environmental potential functions as well as the size and number of rivers. Environmental friendly functions such as conservation and restoration of natural ecosystem around rivers and formation of waterside hydrophilic space are emphasized and policy efforts are being made to minimize environmental pollution and to restore damaged river environment.

However, it is a secondary concrete product to be installed in the river for the purpose of the dimension and the water flow. For example, the waterproofing block, slope protection retaining wall block, Although the performance is excellent, there are problems such as insufficient structural stability review and deterioration of water quality, difficulty of natural purification function, difficulty of growing of plants, destruction and interruption of surrounding natural ecosystem, occurrence of desertification in the earth and inhibition of aesthetics.

Therefore, in order to meet the social demand for the construction of the hydrophilic environment and to improve the problems of the concrete secondary product to be installed in the existing river maintenance industry, it is necessary to restore the damaged natural environment early while satisfying the structural stability as the river revetment structure, And environment-friendly functions that can harmonize with each other.

Microorganisms that have excellent decomposition and removal performance of environmental pollutants are mainly used in agricultural fields such as soil improvement, organic crop cultivation, production of livestock compost, and microbial culture solution itself in order to purify wastewater in a sewage end treatment plant. In addition, there are some studies that use complex microorganisms in concrete. However, the use of complex microorganisms simply decreases the reproduction and activation of microorganisms, and intensively uses microorganisms capable of directly decomposing harmful pollutants The effect of purifying water by microorganisms can not be expected.

Recently, eco-friendly concrete with artificial continuous voids formed in concrete has been studied, and some methods using this method have been applied. However, there are the following problems. First, it has a function of water purification by pore formation, but it only takes into account the simple aeration phenomenon caused by the physical pore of porous concrete, and it is not effective for the purification of polluted water environment. Second, it provides a basis for microorganisms in a large number of continuous voids and purifies polluted river water by the metabolism of activated microorganisms. For smooth water purification performance, it takes a long time for microorganisms to form and form. Third, the pore filling by pseudo-sediments and sediments reduces the water purification effect and it is difficult to expect continuous performance. Finally, there is a problem that strength and durability are deteriorated due to the formation of a large amount of continuous voids inside the composite.

SUMMARY OF THE INVENTION The object of the present invention is to solve the above problems and to provide a concrete block composition for improving water quality and improving vegetation ability as a river environment restoration performance by adding microbes for sewage treatment and an ion exchange material to a composition for producing concrete blocks .

The present invention relates to a composition for producing a concrete block.

Hereinafter, the composition for producing a concrete block of the present invention will be described in detail.

The composition for producing a concrete block of the present invention includes coarse aggregate or waste concrete recycled coarse aggregate having a particle size of 5 mm or more, sand or waste concrete circulating fine aggregate having a particle size of 5 mm or less, a binder, a mixture of microorganisms and an admixture.

The composition for preparing a concrete block may be adjusted as necessary. For example, it may contain 0.1 to 100 parts by weight of sand or a waste concrete circulating fine aggregate of 5 mm or less with respect to 100 parts by weight of recycled coarse aggregate having a particle size of 5 mm or more, 10 to 30 parts by weight of a binder, 2 to 18 parts by weight of a microbial mixture and 0.001 to 0.9 part by weight of an admixture.

In addition, if necessary, the composition for producing a concrete block may further comprise an ion exchange material. The ion exchange material can be used to prepare for the inflow of sewage and wastewater, and to remove heavy metals and various harmful substances in the vicinity of rivers, river water, and the like for early ecological restoration. Specifically, for example, the ion exchange material may use any one or two or more mixed powders selected from zeolite powder and titanium dioxide powder, and the content thereof may be adjusted as necessary, and may be 5 mm or more of cobalt or waste concrete. The use of 0.01 to 10 parts by weight, preferably 1 to 10 parts by weight, more preferably 1 to 5 parts by weight, based on 100 parts by weight of the aggregate is preferable in order to remove heavy metals and various harmful substances.

The recycled aggregate of the present invention is obtained by crushing waste concrete by crushing waste concrete with a jaw crusher and finely pulverizing fine aggregate having a particle size of 5 mm or less, preferably 0.05 to 5 mm, more preferably 0.05 to 4.5 mm, The above-mentioned circulating coarse aggregate can be used. The recycled coarse aggregate is preferably selected as a single particle size of recycled coarse aggregate having a particle size of 5 to 10 mm, 8 to 13 mm, or 8 to 25 mm and incorporated into the composition for producing a concrete block. The reclaimed fine aggregate having the above-mentioned particle size range and the recycled coarse aggregate are preferable for improving porosity, strength, hardness and flexibility in the production of the concrete block composition. The content thereof is adjusted as necessary and is preferably 0.1 to 100 parts by weight, preferably 0.5 to 100 parts by weight, of sand or waste concrete having a particle size of 5 mm or less, based on 100 parts by weight of coarse aggregate or recycled coarse aggregate having a particle size of 5 mm or more. To 50 parts by weight, more preferably from 1 to 15 parts by weight, is used for reasons of good strength and durability of concrete, but not always limited thereto.

The binder is used between the aggregate and the aggregate to mix with water and cure to form a single composition. Specifically, for example, any one selected from among low-carbon two-component cement mixed with ordinary portland cement, ordinary Portland cement and blast furnace slag, ordinary low-carbon three-component cement mixed with Portland cement and blast furnace slag fine powder and fly ash Two or more. It is preferable that 10 to 30 parts by weight, preferably 15 to 25 parts by weight, based on 100 parts by weight of coarse aggregate or recycled coarse aggregate having a particle size of 5 mm or more and adjusted by necessity, is used to improve the compressive strength and durability .

It is preferable that 20 to 90% by weight of the ordinary Portland cement and 10 to 80% by weight of the fine blast furnace slag are mixed when mixing the ordinary Portland cement and the blast furnace slag fine powder, and when mixing the usual Portland cement, blast furnace slag fine powder and fly ash, It is preferable that the fly ash contains 20 to 90% by weight of Portland cement, 1 to 65% by weight of blast furnace slag, and 1 to 45% by weight of fly ash. When the blast furnace slag fine powder and fly ash are used in the same range as above, it is preferable because the capillary void decreases and the structure becomes denser to improve the durability and to solve the problem of the initial strength reduction.

In order to improve the durability and reduce the strength, it is preferable to use a blast furnace slag fine powder having a powder degree of 3,000 to 10,000 cm 2 / g and a fly ash having a powder degree of 3,000 to 6,000 cm 2 / g. But is not limited to the above range.

When the complex microorganism was simply added to the existing concrete composition, the microbial reproduction and activation were very low, and the microorganisms that could directly decompose the pollutant source were not utilized, so that the effect of purifying the water by microorganisms could not be expected.

In addition, when the microorganisms are directly incorporated into the concrete, immobilization of the hydroxide compound of the binder due to hydration of the cement and water hardly causes the active metabolism of the microorganisms, and a constant purification effect can not be expected.

The present invention improves the water purification effect and reduces the biochemical oxygen demand (BOD) by adding a microbial mixture capable of directly decomposing a harmful pollution source to a composition for producing a concrete block. The microbial mixture may be used in a weight ratio of 1: 0.001 to 1, preferably 1: 0.01 to 0.5, more preferably 1: 0.05 to 0.2, It is preferable, but not necessarily, to be able to prevent degradation of compressive strength and durability caused by adding the microbial mixture to concrete. The microorganism for sewage treatment may be one or more mixed microorganisms selected from the group consisting of PAOs (Phosphate Accumulating Organisms) and DPAOs (De-Nitrifying Phosphate Accumulating Organisms). The denitrifying microorganism may be, for example, Micrococcus, Pseudomonas, Archomobacter, Bacillus, Paracoccus, Nitrosomonas, Nitrobacter, Nitrobacter, Nitrosococcus, Nitrosospira, Nitrosolobus, Nitrosorobrio, Nitrococcus, Nitrospira, One or more selected from the group of Nitrospina may be used, but the present invention is not limited thereto. The content of the microbial mixed solution is, for example, 2 to 18 parts by weight, preferably 2.1 to 10 parts by weight, more preferably 2.2 to 10 parts by weight, per 100 parts by weight of recycled coarse aggregate having a particle size of 5 mm or more, 8 parts by weight is preferably used in the content range for improving the water purification effect.

In particular, by adding a microorganism and an ion exchange material for sewage treatment to the composition for producing a concrete block of the present invention, it is possible to improve the effect of purifying water by microorganisms by synergy effect and purify nitrogen (N) and phosphorus (P) , It is possible to reduce the biochemical oxygen demand (BOD: Biochemical Oxygen Demand), at the same time to remove the heavy metals and harmful substances in the seawater, and the water purification effect can be greatly improved.

The admixture may be one or a mixture of two or more selected from high performance AE water reducing agents, fluidizing agents and AE agents. The content is preferably 0.001 to 0.9 part by weight based on 100 parts by weight of recycled coarse aggregate having a particle size of 5 mm or more and recycled coarse aggregate having a particle size adjusted as necessary. The strength of the concrete composition can be improved.

In addition, the latex-based SBR polymer or acrylic resin polymer may further be included in the composition for producing concrete block of the present invention for the purpose of improving the compressive strength and durability of the concrete block, and its content is not limited. However, 0.001 to 8 parts by weight, preferably 0.1 to 5 parts by weight, more preferably 0.1 to 1 part by weight, based on 100 parts by weight of the recycled coarse aggregate or recycled coarse aggregate, For reasons.

In addition, a short fiber material may be further included in the composition for producing a concrete block of the present invention for reasons of improvement in flexural strength and flexural toughness, and the short fiber means a length of 5 to 20 cm. Concretely, for example, the above-mentioned staple fibers may be a mixed fiber comprising one or two or more selected from polyvinyl alcohol fiber, polypropylene fiber, nylon fiber and carbon fiber. The content thereof may be 0.0005 to 0.7 part by weight, preferably 0.01 to 0.1 part by weight, more preferably 0.01 to 0.05 part by weight, based on 100 parts by weight of cinder block or recycled coarse aggregate having a particle size of 5 mm or more, When the above range is used, the compressive strength, the bending strength, the abrasion resistance, and the freeze-thaw resistance are improved, so that drying shrinkage and cracking can be suppressed.

Also, a block for recovering the environment using the composition for producing a concrete block is also included in the scope of the present invention, and the block for reclamation of the environment includes a water quality purification block, a river waterproof block, a retaining wall block, .

The present invention relates to a method for purifying nitrogen (N) and phosphorus (P), which are pollutants of streams, by decreasing the biological oxygen demand (BOD) by reducing microbes and ion exchange materials for sewage treatment, And can remove heavy metals and various harmful substances from the river.

Hereinafter, the present invention will be described in more detail by way of examples, but the present invention is not limited to the following examples.

In the present invention, the biological oxygen demand (BOD), the chemical oxygen demand (COD), the total nitrogen (TN) and the total phosphorus (TP) of the concrete block were measured in accordance with the "water pollution process test method".

The following physical properties were measured by the following methods.

1) Biological oxygen demand (BOD)

When the samples were stored at 20 ° C for 5 hours, they were measured from the amount of dissolved oxygen consumed by the aerobic microorganism growth and respiration in the sample.

BOD (mg / L) = (D ₁ - D ₂ ) × P

D ₁ : DO (mg / l) after leaving the diluted sample for 15 minutes,

D ₂ : DO average value (mg / l) of the diluted sample after 5 days of incubation,

P: Dilution ratio of the sample in the diluted sample (diluted sample amount / sample amount)

2) Chemical oxygen demand (COD)

The sample was made alkaline, and a certain amount of potassium permanganate was added. The mixture was heated for a predetermined time, and potassium iodide and sulfuric acid were added thereto to measure the amount of oxygen from the amount of iodine liberated by the remaining potassium permanganate.

 COD (mg / l) = (a-b) x f 1000 / V x 0.2

 a: 0.025 N sodium thiosulfate solution (ml) consumed in the blank test titration,

 b: 0.025 N sodium thiosulfate solution (ml) consumed in the test titration;

 f: Factor of 0.025 N sodium thiosulfate solution

V: Amount of sample (ml)

3) Total nitrogen (T-N) (mg / l)

The measurement of total nitrogen (TN) was carried out using persulfate digestion method. The NO ₂ ^- standard solution was prepared and the absorbance at 220 nm wavelength was analyzed by absorbance analyzer. After the absorbance of the standard solution was analyzed, The absorbance of the test water was measured by an absorption analyzer, and the TN (mg / l) concentration of the test water was determined by substituting this value into the calibration curve.

4) Total phosphorus (T-P) (mg / l)

The total phosphorus (TP) measurement test was performed using ascorbic acid reduction method. KH ₂ PO ₄ standard solution was prepared, and the absorbance at 880 nm wavelength was analyzed by absorbance analyzer, and the calibration curve was prepared and measured The absorbance of the test water sampled every day was measured by an absorption analyzer, and this value was substituted into the calibration curve to determine the TP (mg / l) concentration of the test water.

[Example 1]

8 ~ 13 ㎜ Crushed of a single particle (water absorption 0.89%, density ^{2.62 g / cm 3) 1,610 ㎏} , the sand particle size of 0.08 ~ 4.5 ㎜ (0.95% water absorption, density ^{2.55 g / cm 3) 163 ㎏} , a binder (usually Portland cement) 380 ㎏, mixed microbial solution [40 L of wastewater from a sewage treatment plant containing 80 kg of water, 7 kg of microorganisms for sewage treatment (Acinetobacter group, which is a direct microorganism, and Nitrosomonas, Nitrobacter, Micrococcus, Pseudomonas and Bacillus, denitrifying microorganisms, And 570 g of an admixture (polycarboxylic acid-based high-performance AE water reducing agent, Silad Road Sanitary Co., Ltd., ROADCON-PEMA SR3000) was placed in an omni- The mixture was charged into a mixer and mixed to prepare a composition for producing a concrete block. (BOD), chemical oxygen demand (COD), total nitrogen (TN), and total nitrogen (BOD) of the concrete block manufactured by the method described above were manufactured by using the composition for making the concrete block. (TP) are shown in Table 2 below.

[Example 2]

(Absorption rate: 0.95%, density: 2.55 g / cm ³ ) 153 kg, binder (normal density: 0.89%, density: 2.62 g / cm ³ ) 1,610 kg, particle size of 0.08 to 4.5 mm (Mixed powder of 28 kg of zeolite powder and 10 kg of titanium dioxide powder), a mixed microorganism mixture (water 80 kg, microorganisms 7 kg of sewage treatment (Acinetobacter group and denitrifying microorganism 40 L of wastewater from a sewage treatment plant containing Nitrosomonas, Nitrobacter, Micrococcus, Pseudomonas, and Bacillus group was collected and the microorganism was cultivated at a room temperature of 20 ° C at a temperature of 20 ° C for 500 mL / day) 570 g of carbonaceous high-performance AE water reducing agent (Silk Road, San Jose, ROADCON-PEMA SR3000) was put into an omni mixer and mixed to prepare a composition for producing a concrete block. (BOD), chemical oxygen demand (COD), total nitrogen (TN), and total nitrogen (BOD) of the concrete block manufactured by the method described above were manufactured by using the composition for making the concrete block. (TP) are shown in Table 2 below.

[Example 3]

(Absorption rate: 0.95%, density: 2.55 g / cm ³ ) 153 kg, binder (normal density: 0.89%, density: 2.62 g / cm ³ ) 1,610 kg, particle size of 0.08 to 4.5 mm 38 ㎏ of mixed ionic liquid (Portland cement), 38 ㎏ of ion exchange material (mixed powder of 28 ㎏ of zeolite powder and 10 ㎏ of titanium dioxide powder), mixed microbial solution [76 ㎏ of water, 7 ㎏ of sewage treatment microorganism (Acinetobacter group and denitrifying microorganism 40 L of wastewater from a sewage treatment plant containing Nitrosomonas, Nitrobacter, Micrococcus, Pseudomonas, and Bacillus were collected and incubated at a room temperature of 20 ° C for 500 mL / (Density: 1.12 g / cm2, viscosity: 78 mPs, solids content: 50%, pH: 9.3) and 570 g of an admixture (polycarboxylic acid-based high performance AE water reducing agent: Silk Roadsystem, ROADCON-PEMA SR3000) To prepare a composition for producing a concrete block. (BOD), chemical oxygen demand (COD), total nitrogen (TN), and total nitrogen (BOD) of the concrete block manufactured by the method described above were manufactured by using the composition for making the concrete block. (TP) are shown in Table 2 below.

[Example 4]

(Absorption rate: 0.95%, density: 2.55 g / cm ³ ) 153 kg, binder (normal density: 0.89%, density: 2.62 g / cm ³ ) 1,610 kg, particle size of 0.08 to 4.5 mm 38 ㎏ of water, 34 ㎏ of Portland cement), 38 ㎏ of ion exchange material (28 ㎏ of zeolite powder and 10 ㎏ of titanium dioxide powder) and a mixture of water microorganism [water 76 ㎏, microorganisms for sewage treatment 7 ㎏ (Acinetobacter group, 40 L of wastewater from a sewage treatment plant containing microorganisms Nitrosomonas, Nitrobacter, Micrococcus, Pseudomonas, and Bacillus were collected and cultured at a room temperature of 20 ° C for 500 mL / (Density 1.3 g / cm 2, length 12 ㎝, tensile strength 1,700 ㎫ or more, modulus of elasticity 45 ㎬) of 4 kg, a density of 1.12 g / cm 2, a viscosity of 78 mPs, a solid content of 50% g and an admixture (polycarboxylic acid-based high-performance AE water reducing agent, Silk Roads, Inc., ROADCON-PEMA SR3000) 570 g The composition for producing concrete blocks were charged into a mixer and mixed to manufacture the omnidirectional. (BOD), chemical oxygen demand (COD), total nitrogen (TN), and total nitrogen (BOD) of the concrete block manufactured by the method described above were manufactured by using the composition for making the concrete block. (TP) are shown in Table 2 below.

[Comparative Example 1]

The same procedure as in Example 1 was carried out except that 87 kg of water was added in Example 1 and no sewage treatment microorganism was added. The concrete block (300 x 300 x 50 mm) The oxygen demand (BOD), the chemical oxygen demand (COD), the total nitrogen (TN) and the total phosphorus (TP) are shown in Table 2 below.

[Table 1]

[Table 2]

Table 2 compares the biological oxygen demand (BOD), the chemical oxygen demand (COD), the total nitrogen (T-N) and the total phosphorus (T-P) as a result of the water quality purification test of the concrete block according to the examples and the comparative examples.

24.0 g of tap water, 1.83 g of ammonium chloride (NH ₄ Cl), 0.63 g of potassium hydrogen phosphate (KH ₂ PO ₄ ), 3.60 g of magnesium sulfate hepta hydrate (MgSO ₄ .7H ₂ O) 0.48 g of calcium chloride dihydrate (CaCl ₂ .2H ₂ O), 1.20 g of sodium chloride (NaCl) and 6.76 g of glucose.

In order to evaluate the contamination degree of the composition for preparing a concrete block using microorganisms for sewage treatment and an ion exchange material, artificial wastewater was manufactured by using the above method, and a 300 × 300 × 50 mm concrete block manufactured by the present invention was purified The water was circulated at a rate of 2 L / min, and the amount of TN and TP was measured while the amount of sunshine was controlled by turning on and off the lamp with 2.000 lux artificial lighting for 12 hours.

[Table 3]

In Table 3, by adding microorganisms for sewage treatment and an ion exchange material to the composition for producing concrete blocks, TN removal rate and TP removal rate, which are evaluated by COD removal rate, BOD removal rate, and river pollution degree, Which is higher than that of the concrete block.

Claims (11)

And an ion exchange material which is a mixed powder of a cobalt or a waste concrete circulating coarse aggregate having a particle size of 5 mm or more, a sand or waste concrete circulating fine aggregate having a particle size of 5 mm or less, a binder, an admixture, a mixture of microbes and a zeolite powder and a titanium dioxide powder ,
Wherein the microbial mixture solution contains one or more selected from the group consisting of PAOs (Phosphate Accumulating Organisms) and DPAOs (De-Nitrifying Phosphate Accumulating Organisms). The method according to claim 1,
0.1 to 100 parts by weight of a sand or waste concrete circulating fine aggregate having a particle size of 5 mm or less, 10 to 30 parts by weight of a binding material, 2 to 18 parts by weight of a mixture of recycled coarse aggregates having a particle size of 5 mm or more, 0.001 to 0.9 part by weight of an admixture and 0.01 to 10 parts by weight of an ion exchange material. delete The method according to claim 1,
Wherein the ion exchange material is a mixture of zeolite powder and titanium dioxide powder in a weight ratio of 50:80 to 20:50. The method according to claim 1,
The binder is usually Portland cement,
Mixed low-carbon two-component cement mixed with ordinary portland cement and blast furnace slag powder,
A mixture of low-carbon three-component cement mixed with Portland cement, blast furnace slag fine powder and fly ash. The method according to claim 1,
Wherein the microbial mixture solution contains water and microorganisms for sewage treatment at a weight ratio of 1: 0.001 to 1. delete The method according to claim 1,
Wherein the admixture is one or a mixture of two or more selected from high performance AE water reducing agents, fluidizing agents and AE agents. The method according to claim 1,
Wherein the latex-based SBR polymer or acrylic resin polymer is further added in an amount of 0.001 to 8 parts by weight based on 100 parts by weight of the recycled coarse aggregate having a particle size of 5 mm or more. The method according to claim 1,
Wherein the organic fiber obtained by mixing at least one member selected from the group consisting of polyvinyl alcohol fibers, polypropylene fibers, nylon fibers and carbon fibers with 100 parts by weight of the recycled coarse aggregate having a particle size of 5 mm or more, 0.7 part by weight based on the total weight of the composition. A block for restoring an environment using a composition for manufacturing a concrete block according to any one of claims 1, 2, 4 to 6, and 8 to 10.