KR20180025331A - A Concrete Composition With Water-Purifying and Anti-Microbial Fucntion - Google Patents

Abstract

The present invention relates to a concrete composition for forming an underwater concrete block having water purification function and antibacterial properties. The concrete composition comprises: 347-361 parts by weight of Portland cement; 980-1,040 parts by weight of coarse aggregate; 695-737 parts by weight of fine aggregate; 164-170 parts by weight of water; and 0.1-0.3 parts by weight of an admixture, and further comprises: 1.8-7 parts by weight of regular sulfur; and 3-11 parts by weight of carbon powder. More preferably, the concrete composition comprises: 354 parts by weight of the Portland cement; 1,010 parts by weight of the coarse aggregate; 716 parts by weight of the fine aggregate; 167 parts by weight of the water; 0.18 parts by weight of the admixture; 3.5 parts by weight of the regular sulfur; and 3.5-10.1 parts by weight of the carbon powder. The concrete composition is composed by environmentally-friendly concrete materials that have antibacterial action as well as functions for alleviating and purifying water pollution, and thus can be used to form an underwater concrete block that exhibits long-lasting excellent water purification effects.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a concrete composition having water purification function and antimicrobial activity,

The present invention relates to a concrete composition for manufacturing an underwater concrete structure, and more particularly, to a concrete composition comprising Portland cement, coarse aggregate, fine aggregate, water, water, admixture, And to produce an underwater-installed concrete composition having antibacterial properties.

In particular, the waterproofing block is installed in a river such as a stream or a river. The waterproofing block is a waterproofing block, a vegetation waterproofing block, This is a block to prevent the scour phenomenon. Specifically, the scour prevention block is configured such that a fish or an amphibian can be inhabited or evacuated through an associative space formed by filling a groove in a groove formed at the center of the body and an associative passage formed when the block is installed See the example of the scour prevention block), it is mainly made of concrete and installed in the river.

On the other hand, considering the pollution degree of major rivers in Korea, the pollution degree is higher as the biological oxygen demand (BOD) etc. There is a growing demand for eco-friendly concrete products that have the function of water purification and antimicrobial functions that can suppress water pollution and purify contaminated water quality. However, since the introduction of concrete in Korea, As far as development is concerned, the function and performance of concrete is generally limited to basic things such as compressive strength, workability, durability and fire resistance.

As a conventional technique, a water permeable concrete structure using a gypsum stone is introduced in a domestic registered patent publication (Registration No. 10-089401), which includes a gypsum aggregate, a fortent cement, a tricalcium aluminate, a tricalcium silicate , Calcium sulphoaluminate and calcium silicate. The present invention relates to a concrete structure in which a concrete composition is formed of a high-strength cement composed of components such as calcium sulfoaluminate and calcium silicate. It is not mentioned. A porous vegetation concrete composition for producing a waterproofing block or a vegetation block for stabilizing a river block and a coastal block or a road surface is disclosed in a published patent application (Publication No. 2010-18122) As a concrete composition, porous vegetable concrete product foamed with cement, vegetable foam, cation adsorbent, plant growth promoter and cryoprotectant composition has a function of porosity which facilitates the growth of plants by facilitating the drainage of water by the porous structure. The invention also does not mention the purifying function to decompose and remove harmful substances and pollutants.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the related art, and has the following objectives.

An object of the present invention is to provide a concrete composition capable of producing a concrete structure having not only a function of improving and purifying water pollution but also an environmentally friendly concrete material having an antibacterial action and having an excellent improvement effect on the purification of water quality.

In addition, the present invention has an object to provide a concrete structure installed in a river by which water pollution and antimicrobial function can be maintained for a long period of time, thereby improving water purification quality.

In order to achieve the above object, the present invention is implemented by the following means.

The present invention includes Portland cement 347 to 361, 980 to 1040 parts by weight of coarse aggregate, 695 to 737 parts by weight of residual aggregate, 164 to 170 parts by weight of water and 0.1 to 0.3 part by weight of admixture, 1.8 to 7 parts by weight of general sulfur, And 3 to 11 parts by weight of a powder. The concrete composition for preparing an underwater installed concrete block having a water purification function and an antibacterial property is also provided.

More preferably, the Portland cement contains 354 parts by weight; 1010 parts by weight of the coarse aggregate; 716 parts by weight of the fine aggregate; The water contained 167 parts by weight; 0.18 parts by weight of the admixture; 3.5 parts by weight of the general sulfur; And 3.5 to 10.1 parts by weight of the carbon powder.

The present invention has the following effects with the above-described configuration.

The present invention relates to a concrete composition for the production of a concrete structure having an excellent improvement effect on purification of water and having an excellent antibacterial action and having long-term stability, as well as a function of improving and purifying water pollution, .

1 A perspective view of the scour prevention block

Hereinafter, the solution means of the present invention will be described in detail. The detailed description of known technology, which is considered to be unnecessarily obscured by the gist of the present invention, will be omitted.

The present invention includes Portland cement 347 to 361, 980 to 1040 parts by weight of coarse aggregate, 695 to 737 parts by weight of residual aggregate, 164 to 170 parts by weight of water and 0.1 to 0.3 part by weight of admixture, 1.8 to 7 parts by weight of general sulfur, And 3 to 11 parts by weight of a powder. The concrete composition for preparing an underwater installed concrete block having a water purification function and an antibacterial property is also provided. More preferably, the Portland cement contains 354 parts by weight; 1010 parts by weight of the coarse aggregate; 716 parts by weight of the fine aggregate; The water contained 167 parts by weight; 0.18 parts by weight of the admixture; 3.5 parts by weight of the general sulfur; And 3.5 to 10.1 parts by weight of the carbon powder.

The description of the portland cement and aggregate of the present invention will be omitted because it is a well-known technical element that can be readily understood and practiced by a person skilled in the art. Hereinafter, the present invention will be described in detail with reference to the following examples. Explain.

Recently, modified sulfur has been used to improve performance against deterioration of concrete structures. That is, the modified sulfur is prepared by modifying the modified sulfur with a modifier such as dicyclopentadiene (DCDP), and then the modified sulfur is blended together with the aggregate in the concrete dry method, and then the cement and water are introduced Sulfur is being used as a method of use. The modified sulfur is a binder and functions to make curing through melting by heating at a temperature of 120 ° C to 130 ° C. However, the present invention uses general sulfur except for modified sulfur. By mixing natural sulfur and filler and then curing the concrete through natural curing, the adhesive strength of the aggregate of sulfur, the plastic deformation and the fatigue crack resistance increase In addition to the effect of sterilization or antimicrobial function of the concrete structure to provide an antibacterial function.

Sulfur has been sterilized or antimicrobial since 1960, and it has been used as a bactericide of agricultural products in the farm. When sulfur is applied to the skin, it acts on organic matter to form pentathion acid, and this substance dissolves keratin skin, Has been known, but the known effect of sulfur is only that it acts on the skin or has an insecticidal effect, so it has nothing to do with the existing concrete structure in the water, nor is it known as an antimicrobial functional substance in the concrete field.

  Table 1 and Table 2 below show the antibacterial activity of sulfur powder and modified sulfur through Escherichia coli and fungus test. It is confirmed that the sulfur powder having a bacterial reduction rate of 99.9% after 24 hours is excellent in antibacterial activity.

E. coli test Initial number of bacteria
(cfu / mL) Number of bacteria after 24 hours
(cfu / mL) Reduction rate
(%) BLANK 1.8 x 10 ⁴ 6.5 x 10 ⁴ - Sulfur powder 1.8 x 10 ⁴ <10 99.9 Modified sulfur 1.8 x 10 ⁴ 5.8 x 10 ⁴ 10.7

Fungus test Initial number of bacteria
(cfu / mL) Number of bacteria after 24 hours
(cfu / mL) Reduction rate
(%) BLANK 1.5 x 10 ⁴ 6.2 × 10 ⁴ - Sulfur powder 1.5 x 10 ⁴ <10 99.9 Modified sulfur 1.5 x 10 ⁴ 5.6 x 10 ⁴ 9.7

The general sulfur (sulfur powder) of the present invention may be a natural sulfur derived from a mine as a conventional sulfur element other than the modified sulfur. On the other hand, in the refining process of the refinery in Korea, the amount of sulfur generated during desulfurization reaches about 1.5 million tons per year. It is also preferable to use sulfur. The present invention is mixed at a ratio of 1.8 to 7 parts by weight, preferably 3.5 parts by weight, of a sulfur powder, and exhibits sterilizing or antibacterial functions as shown in the following examples.

The admixture of the present invention increases the workability of the coarse aggregate and the fine aggregate to a large extent and has a water reducing effect, and uses a polycarboxylic acid-based high-performance admixture as an admixture for underwater concrete. The Portland cement uses 0.1 to 0.3 parts by weight, preferably 0.18 part by weight, of the admixture based on 354 parts by weight.

The carbon powder of the present invention is a powder obtained by carbonizing a wood pulp or palm tree in a closed electric furnace maintained at a temperature of 500 to 800 ° C. for 4 to 5 hours and then pulverizing it to 325 mesh. The functional group of carbon atoms on the surface is a liquid And a property of strongly adsorbing and binding to the adsorbable molecules of the gas to purify the liquid and the gas. In the present invention, the Portland cement is mixed at a ratio of 3 to 11 parts by weight of carbon powder based on 354 parts by weight of the concrete to produce a concrete structure using the purifying function of the carbon powder.

Hereinafter, the present invention will be described in detail with reference to specific examples and comparative examples. The following examples illustrate the invention in more detail but do not limit the scope of the invention.

Example  1 ~ Example  3

In Example 1, 354 Kg of Portland cement, 1010 Kg of coarse aggregate, 716 Kg of fine aggregate, 167 Kg of water, 3.5 Kg of sulfur powder, 0.18 Kg of admixture and 3.5 Kg of carbon powder were mixed to produce the scour prevention block of the present invention . Example 2 and Example 3 were prepared in the same manner as in Example 1, except that 7.0 Kg and 10.5 Kg of carbon powder were contained, respectively.

Comparative Example  One

 In Comparative Example 1, 354 Kg of Portland cement, 1010 Kg of coarse aggregate, 716 Kg of residual aggregate, 167 Kg of water and 0.18 Kg of admixture were blended to prepare blocks, .

&Lt; First Compressive Strength Test >

The most important factor that determines the merchantability of concrete products is strength or durability. Concrete products that are easily destroyed and durable, even if they are highly functional, require huge cost because they require rebuilding. In the present invention, the strength of the concrete was evaluated by measuring the compressive strength. According to KS F 2405 of compressive strength, specimens with diameter of 10cm and height of 30cm were prepared and the compressive strength was measured by Universial Testing Machine. The results are shown in Table 3, which shows the compressive strength of concrete specimens.

Comparative Example 1 Example 1 Example 2 Example 3 Test method (standard value) Compressive strength (MPa) 32.5 31.4 30.2 28.3 KS F2405 (24)

As shown in Table 3, although Examples 1 to 3 are somewhat lower than the compressive strength of Comparative Example 1 due to the addition of sulfur powder and carbon powder, all of the Examples 1 to 3 are significantly higher than the compressive strength of 24 MPa And that it has excellent durability.

&Lt; First water quality purification performance test >

In order to evaluate the bleaching ability of methylene blue according to the concrete composition, 25 mL of a solution of 2.4 mg / L of blue (MB) was put into a shaking incubator for 30 minutes, and the concentration of methylene blue was changed by an ultraviolet / visible ray spectrophotometer US-Visspectrophotometer) to determine the bleaching ability of methylene blue.

Comparative Example 1 Example 1 Example 2 Example 3 Test Methods Methylene blue decolorization performance (μmol / L · min) (per 1 g sample) 0.002 0.012 0.013 0.013 KSM 1802
(Activated Carbon Test Method)

In order to investigate the water pollution index of the concrete structure according to concrete composition, the concrete specimen was crushed, and 50g of the concrete was placed in a 300 ml Erlenmeyer flask. 200 ml of the contaminated water was placed in the flask, (BOD), chemical oxygen demand (COD), total phosphorus (TP), and the change of BOD, COD, and TP over time Test results showed that the reduction performance of COD, TN, and TP was uniform in Examples 1 to 3, and that the abatement capacity of water pollutants was increased according to the amount of carbon powder added.

Comparative Example 1 Example 1 Example 2 Example 3 Test Methods BOD (mg / L)
(Reduction rate)
Pollution number 70.3 68.1
(3%) 63.2
(10%) 59.7
(15%) 55.5
(21%) Water pollution process test standard
(Ministry of the Environment Notice
No. 2013-99) COD (mg / L)
(Reduction rate)
Pollution number 35.7 34.6
(3%) 31.1
(10%) 30.0
(13%) 29.1
(16%) TP (mg / L)
(Reduction rate)
Pollution number 1.928 1.905
(One%) 1.625
(15%) 1.552
(18%) 1.498
(21%)

<First Antibacterial Performance Test>

Table 6 and Table 7 show the results of the E. coli test and the Staphylococcus aureus test measured by KCL-FIR-1002 (shaking culture method), and in Examples 1 to 3, the reduction rate of E. coli and Staphylococcus aureus was found to be 99.9% .

E. coli test Comparative Example 1  Example 1 Example 2 Example 3 Test Methods BLANK
1.6 x 10 ⁴ 1.6 x 10 ⁴ 1.6 x 10 ⁴ 1.6 x 10 ⁴ 1.6 x 10 ⁴ KCL-FIR-1002
(Shaking culture method) After 24 hours
density
6.3 x 10 ⁴ <10 <10 <10 <10 Bacterial reduction rate
(%) 99.9 99.9 99.9 99.9

Staphylococcus aureus test Comparative Example 1  Example 1 Example 2 Example 3 Test Methods BLANK
1.5 x 10 ⁴ 1.5 x 10 ⁴ 1.5 x 10 ⁴ 1.5 x 10 ⁴ 1.5 x 10 ⁴ KCL-FIR-1002
(Shaking culture method) After 24 hours
density
5.0 × 10 ⁴ <10 <10 <10 <10 Bacterial reduction rate
(%) 99.9 99.9 99.9 99.9

<First Heavy Metal Dissolution Test>

Heavy metal leaching tests were conducted on the concrete specimens prepared in Examples 1 to 3 and Comparative Example 1. For the heavy metal elution, a cylindrical specimen with a diameter of 10 cm was cut to a height of 10 cm, placed in a 1000 mL beaker, placed in 500 mL of distilled water, left for 7 days, and the remaining eluted water was measured using an ion-conductive plasma spectroscopy (ICP) Respectively. The ICP used was Optimer 5300DV from Perkin-Elmer. Heavy metals were tested for lead (Pb), arsenic (As), and cadmium (Cd). As a result of the test, it is considered that lead, arsenic and cadmium are not detected in the elution water of all the concrete compositions, so that environmental pollution by heavy metals is not caused.

heavy metal Comparative Example 1 Example 1 Example 2 Example 3 ICP dissolution test
(7 days elution) Lead (Pb) N.D. N.D. N.D. N.D. Arsenic (As) N.D. N.D. N.D. N.D. Cadmium (Cd) N.D. N.D. N.D. N.D.

N.D .: Not detected, no analyte detected or below the minimum detection limit.

As a result of the above test results, the scour prevention block of the present invention has a compressive strength of 28.3 MPa or more and has a strength equal to or higher than that of conventional concrete. It has excellent methylene blue adsorbing ability and has a biological oxygen demand (BOD) It is confirmed that the compound (TP) can be greatly reduced and the water purification function is excellent, and the antiblocking function is excellent by the test of Escherichia coli and the like.

The same test was carried out after 100 cycles of freezing and thawing according to the method B of KSF 2456 in order to confirm whether such a function can be maintained for a long period of time. As a result, it was confirmed that the compressive strength, the water purification function and the antibacterial function were maintained. The results are shown in Table 9 below, <Secondary Compressive Strength Test (Table 9)>, <Second Water Quality Test (Table 10: Methylene Blue Discoloration Performance) (Table 9) E. coli) (Table 13: Staphylococcus aureus). In particular, as shown in <Table 12> and <Table 13>, the antibacterial functions of Examples 1 to 3 were maintained as 99.9% after 100 cycles of freezing and thawing, .

Comparative Example 1 Example 1 Example 2 Example 3 Test method (standard value) Compressive strength (MPa) 30.7 29.8 28.7 27.5 KS F2405 (24)

Comparative Example 1 Example 1 Example 2 Example 3 Test Methods Methylene blue decolorization performance (mol / Lmin) (per 1 g sample) 0.002 0.011 0.012 0.012 KSM 1802
(Activated Carbon Test Method)

Comparative Example 1 Example 1 Example 2 Example 3 Test Methods BOD (mg / L)
(Reduction rate)
Pollution number 68.5 ? 66.5
(3%) 61.6
(10%) 58.9
(14%) 54.8
(20%) Water pollution process test standard
(Ministry of the Environment Notice
No. 2013-99) COD (mg / L)
(Reduction rate)
Contaminated water 37.1 36.0
(3%) 33.4
(10%) 31.9
(14%) 31.5
(15%) TP (mg / L)
(Reduction rate)
Pollution number 1.912 1.892
(One%) 1.644
(14%) 1.586
(17%) 1.529
(20%)

E. coli test Comparative Example 1  Example 1 Example 2 Example 3 Test Methods BLANK
1.5 x 10 ⁴ 1.5 x 10 ⁴ 1.5 x 10 ⁴ 1.5 x 10 ⁴ 1.5 x 10 ⁴ KCL-FIR-1002
(Shaking culture method) After 24 hours
density
6.7 x 10 ⁴ 3.3 x 10 ⁴ <10 <10 <10 Bacterial reduction rate
(%) 50.7 99.9 99.9 99.9

Staphylococcus aureus test Comparative Example 1  Example 1 Example 2 Example 3 Test Methods BLANK
1.4 x 10 ⁴ 1.4 x 10 ⁴ 1.4 x 10 ⁴ 1.4 x 10 ⁴ 1.4 x 10 ⁴ KCL-FIR-1002
(Shaking culture method) After 24 hours
density
4.7 × 10 ⁴ 2.2 x 10 ⁴ <10 <10 <10 Bacterial reduction rate
(%) 53.2 99.9 99.9 99.9

Claims (3)

A concrete composition for producing an underwater installed concrete block,
Portland cement 347 to 361, 980 to 1040 parts by weight of coarse aggregate, 695 to 737 parts by weight of residual aggregate, 164 to 170 parts by weight of water and 0.1 to 0.3 part by weight of an admixture,
1.8 to 7 parts by weight of general sulfur and 3 to 11 parts by weight of carbon powder, and has a water purification function and antimicrobial activity.
The method according to claim 1,
354 parts by weight of the Portland cement;
1010 parts by weight of the coarse aggregate;
716 parts by weight of the fine aggregate;
The water contained 167 parts by weight;
0.18 parts by weight of the admixture;
3.5 parts by weight of the general sulfur; And
Wherein the carbon powder is 3.5 to 10.1 parts by weight. 3. The method according to claim 1 or 2,
Wherein the admixture is a polycarboxylic acid-based high-performance admixture as an admixture for an underwater concrete having an increase in workability and a water reducing effect, and has a water purification and antimicrobial property.

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