KR20150022033A - Compositions of pervious concrete products by using the aggregates from industrial wastes and method for the same - Google Patents

Abstract

The present invention relates to a water permeable concrete composition having high bending intensity and a manufacturing method thereof, and more specifically, to a water permeable concrete composition which uses industrial waste such as nickel smelting slag, copper smelting slag, steelmaking slag, and bottom ash generated in a smelting factory and a thermoelectric power plant as aggregates, and uses a material mixing normal portland cement, blast furnace slag cement, fly ash cement and a compound, a high performance superplasticizer, and an intensity reinforcing agent as a bonding material, thereby having excellent physical properties such as water permeability, bending intensity, freezing damage resistance, and chemical resistance.

Description

Technical Field [0001] The present invention relates to a water-permeable concrete composition using industrial waste as an aggregate, and a method for producing the same,

The present invention relates to a water permeable concrete composition using industrial waste as an aggregate and a method for producing the same, and is characterized by using nickel smelting slag, copper smelting slag, steel making slag and bottom ash generated in an industrial waste smelter and a thermal power plant And the binder is a mixture of general portland cement, blast furnace slag cement, fly ash cement and admixture, high performance water reducing agent, and strength reinforcement, and has excellent properties such as water permeability, bending strength, anti-freeze and chemical resistance The present invention relates to a water permeable concrete composition using waste as an aggregate and a method for producing the same.

The interlocking blocks widely used for the pavement of the roads and the pavement of the present roads are cement concrete products with low permeability. Most rainwater flows along the surface of the ground during rainfall and drained to the drainage of roads. Therefore, when the amount of precipitation is rapidly increased at a certain time, flooding of the city is frequent because the road is overflowed and the amount of absorption into the underground road is small. On the other hand, the greening block which is applied to the shore wall of the shore or the road side is required to have a porous or permeable retaining wall for the plant growth. Also, it is required to suppress the influence of the heat island on the roads, A water permeable block or a packaging material is essentially required in order to obtain good drainage effect and the like.

Generally, unlike general concrete products, permeable rocks and road pavement concrete have a disadvantage of relatively low compression and bending strength because they use a large amount of coarse aggregate having uniform size. Therefore, it is required to develop a composition and a manufacturing method of a water-permeable block or a pavement concrete having a high compression and bending strength while maintaining a proper water permeability. Especially, it is more preferable that the constituent materials thereof are composed of environmentally friendly materials desirable. Particularly recently, interest in recycling of smelting slag, fly ash and bottom ash, which are generated in large quantities in smelters and coal-fired power plants, is getting more attention, and effective utilization of these industrial wastes is required in preparation for depletion of natural aggregates.

Generally, permeable concrete products are composed of coarse aggregate mainly used for increasing porosity and relatively small amount of binder used to make a composition having strong adhesive force, and concrete composition composed of high strength fine aggregate as a connecting material with coarse aggregate . The development of the composition of the water permeable concrete and the manufacturing method thereof will be described as follows.

For example, Patent Document 1 discloses a water permeable concrete composition and a method for producing the same, which discloses mixing a mixture of Portland cement, geopolymer and bottom ash as a binder with a high-performance water reducing agent and an intensifying material, Document 2 discloses a water permeable concrete composition using Portland cement, CSA cement, fine powder fly ash, blast furnace slag fine powder and bottom ash having a particle size of 5 to 20 mm as coarse aggregate. In the above method, since the strength of the aggregate due to the use of the bottom ash of both the coarse aggregate and the fine aggregate is weak, the bridge between the binder and the coarse aggregate is weak, so that the strength (bending) of the permeable concrete product tends to be lowered .

In Patent Document 3, the natural aggregate of various colors, blast furnace slag, activated fly ash, and caustic lime are mixed together, and the upper and lower portions of the aggregate are respectively composed of slurries of 2-8 mm and 13-40 mm aggregate size However, since zeolite is produced by curing at a high temperature, energy consumption is high, another heat treatment is required to obtain active fly ash, and all of the natural aggregates are used. There is a problem.

In the case of a water permeable block product using a permeable concrete using the above cement-based material or an epoxy or melamine resin as a binder, there is a concern that a resin or the like causes porous low porosity, which is a characteristic of bottom ashes, to be deteriorated, It also lacks economic efficiency.

Patent Document 4 discloses a composition of porous concrete having a flexural strength of 50 kgf / cm 2 or more by using a powdery admixture, powdery admixture, powder of calcium silicate hydrate, high performance water reducing agent and water, and a manufacturing method thereof, but the cost of the powdery admixture And the use of natural aggregates.

In Patent Document 4, 30 weight parts or more of an admixture such as silica fume and the like is used in 100 weight parts of the cement in the binder composition of the in-situ permeable concrete having a bending strength of 70 kgf / cm2 or more and a water permeability coefficient of 0.65 cm / sec There is a problem that crushed stone or natural aggregate is used in both of excessive use of relatively expensive silica fume and coarse aggregate.

On the other hand, a large amount of slag is generated in steelmaking, copper smelting, nickel smelter, etc., and effective utilization thereof is required. Therefore, there is a need to examine the possibility of use as a substitute for natural fine aggregate such as steel sand.

Therefore, in a new water permeable concrete composition capable of improving low bending strength which is a disadvantage of permeable concrete using conventional bottom ash as an aggregate, the coarse aggregate is produced by crushing the bottom ash produced in a thermal power plant without going through a water- It is necessary to develop permeable concrete blocks and packing materials suitable for the standard by using thick coarse aggregate and relatively low price of water chain smelting slag as fine aggregate.

Korean Registered Patent No. 1214596 (registered on December 14, 2012) Korea registered patent No. 0592781 (registered on June 16, 2006) Japanese Unexamined Patent Application Publication No. 2006-083046 (Mar. 30, 2006) Japanese Patent Application Laid-Open No. 2009-203145 (2009.09.10) Japanese Patent Application Laid-Open No. 2001-181009 (July 23, 2001)

SUMMARY OF THE INVENTION The object of the present invention is to solve the above-mentioned problems, and it is an object of the present invention to provide a method for manufacturing a fuel cell, which comprises mixing portland cement (OPC), blast furnace slag cement (BFSC), fly ash cement (FAC), silica fume and diatomaceous earth as additives, (NiS), copper smelting slag (CuS), steel slag (FeS), and bottom ash are used as the fine aggregate in the mortar, and water is added to a composition composed of a high-performance water reducing agent and a strength reinforcing material. (As defined in KSF 4419, paragraph 8.4 "Permeability test method") and a bending strength of at least 0.1 mm / sec as a coarse aggregate, mixed with bottom ashes from boilers of a porous, Providing a composition for producing a water-permeable interlocking sidewalk block or a pervious road pavement which is at least about 40.816 kgf / cm 2 (according to KSF 4419 Section 8.1 "Test Method for Bending Strength") Here it is attempted.

In order to achieve the above object, in the present invention, a mixture of Portland cement, blast furnace slag cement, fly ash cement and fine aggregate slag as refractory materials, bottom ash of thermal power plant as a coarse aggregate, admixture, high performance water reducing agent, As sexable concrete,

The blast furnace slag cement and the fly ash cement were each mixed with Portland cement at a ratio of 50:50 and 80:20,

Fine aggregate slag is nickel smelting slag, copper smelting slag and steel slag, and its grain size is 0.1 ~ 3.0mm. Bottom ash, which is coarse aggregate, is classified into 3 ~ 13mm by aggregate generated from coal-fired power plant.

The water permeable concrete has a composition of 50 to 250 parts by weight of fine aggregate, 300 to 600 parts by weight of coarse aggregate, 5 to 10% by weight of an admixture based on 100 parts by weight of binder, 100 parts by weight of high- And 0.1 to 1.0 part by weight of the reinforcing material, 1.0 to 3.0 parts by weight of the reinforcing material is added to 100 parts by weight of the binder, and water is composed of water / binder ratio of 0.15 to 0.25. A concrete composition is provided.

Hereinafter, the present invention will be described in more detail.

The composition of the mortar material in the composition of the water permeable concrete and the method of manufacturing the product according to the present invention is as follows: the composition of the Portland cement (OPC), the blast furnace slag cement (BFSC), the fly ash cement (FAC) ), Copper smelting slag (CuS), steel slag (StS), silica fume and diatomaceous earth as the admixture, melamine, naphthalene and polycarboxide ether as the high performance water reducer as the additives, and vinylon fiber, , Polyvinylene fiber, aramid fiber, etc., and use porous ash aggregate with high water retention as coarse aggregate and have a permeability coefficient of not less than about 0.1 mm / sec (according to KSF 4419 section 8.4 "Permeability test method"). And having a flexural strength of about 40.816 kgf / cm 2 (according to KSF 4419, paragraph 8.1, "Test Method for Bending Strength").

Further, in the composition of the water permeable concrete and the method of manufacturing the product according to the present invention, the blast furnace slag cement is the cement mixed with the Portland cement and the fine blast furnace slag in a ratio of 50:50, and the fly ash cement comprises the Portland cement And the fly ash is mixed at a ratio of 80:20. The nickel smelting slag, the copper smelting slag, and the steel making slag are obtained by sintering the molten slag and have a grain size of 0.1 to 3.5 mm. The bottom ash, which is a coarse aggregate, And the silica fume and the diatomaceous earth as the admixture have a particle size of 0.1 mu m to 1.0 mu m.

The composition of the water permeable concrete composition of the present invention is 50 to 250 parts by weight of fine aggregate (NiS, CuS, StS) relative to 100 parts by weight of cement (OPC, BFSC, FAC) And 600 parts by weight.

As additives, silica fume and diatomaceous earth as additives are added in an amount of 5 to 10 parts by weight with respect to 100 parts by weight of the binder, 0.1 to 1.0 part by weight and 1.0 to 3.0 parts by weight with respect to 100 parts by weight of the high performance water reducing agent and strength reinforcement, Water / binder ratio in a weight ratio of 0.15 to 0.25.

In order to achieve the above object, a method of manufacturing a water permeable concrete product according to the present invention comprises the steps of preparing a mortar composition as described above, adding fine aggregate and bottom ash, which are coarse aggregates, in a mixer, To produce a block product or the like, or by pouring the above-mentioned water-permeable concrete composition directly on the road, and naturally curing it. The strength test for block products or in situ permeable concrete products is based on the values measured after 28 days curing.

As described above, the water-permeable concrete composition according to the present invention uses cement (OPC, BFSC, FAC) as a binder and smelter slag (NiS, CuS, StS) as a fine aggregate and uses other additives as a coarse aggregate The effect of strengthening the adhesion between the bottom ash and the binder is improved and the excellent physical properties such as shrinkage, durability, chemical resistance and bending strength of the water permeable concrete product can be obtained.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block product of various forms of permeable concrete according to the present invention; FIG.
Fig. 2 is a photograph showing the water permeability phenomenon of the block product. Fig.
3 is an embodiment showing a permeability testing apparatus.
4 is a process diagram for explaining a manufacturing process of a water permeable concrete pavement or block according to the present invention.

These and other objects and novel features of the present invention will become more apparent from the description of the present specification and the accompanying drawings.

First, the concept of the overall composition of the present invention will be described.

Generally, the cement used as the binder is usually Portland cement having a brine specific surface area of about 4000-6000 cm2 / g. The blast furnace slag fine powder is pulverized at a brain specific surface area of about 6000 cm2 / g. Fly ash is about 4000 Cm < 2 > / g, the blended slag cement is mixed with Portland cement at a mixing ratio of 50:50, and the fly ash cement is mixed with Portland cement at a blending ratio of 80:20 . Table 1 shows the chemical composition of these materials.

ingredient
division
SiO ₂ Al ₂ O ₃ CaO Fe ₂ O ₃ MgO K ₂ O Na ₂ O SO ₃ OPC 20.07 8.84 60.14 1.41 2.49 0.86 0.28 2.53 BFS 33.1 14.6 41.1 0.97 7.03 0.27 0.15 0.07 FA 52.2 22.8 3.41 3.85 0.89 1.49 0.13 2.90

The fine aggregate used in the present invention is a slag generated in a nickel smelter, a copper smelter and a steelmaking plant, which is ground and crushed into a molten state and has a particle size of about 0.1 to 5.0 mm. Its chemical composition is shown in Table 2 Same as.

ingredient
division
SiO ₂ Al ₂ O ₃ CaO Fe ₂ O ₃ MgO K ₂ O Na ₂ O SO ₃ BA 52.2 28.9 0.83 9.77 0.30 1.38 0.25 - NiS 59.0 9.10 0.35 5.1 28.10 - - 0.02 CuS 28.0 5.00 3.0 47.5 1.50 - - - StS 5.16 2.49 38.6 31.0 6.31 - - 0.01

Bottom ash, which is coarse aggregate, is attached to the inner wall of boiler of thermal power plant and does not contain large amount of glass paste such as fly ashina steel slag, copper smelting slag and nickel smelting slag, Of the glass surface.

In addition, the bottom ash is a physical characteristic, and the color is mostly gray, and the color varies depending on the production environment from dark yellow to black gray. Unburned carbon particles are black, and many silica and alumina components are grayish white and yellowish. The bottom ash does not meet the conditions such as particle shape and chemical composition in order to function as a binder. The bottom ash has a specific gravity of about 2.1 to 2.7, a dry weight of bottom ash of 720 to 1600 kg / m 3, no plasticity, and a very wide absorption rate of about 2.0% to about 10.0%. The particle size is preferably about 3 to 13 mm.

On the other hand, the silica fume and diatomite used as the admixture have a particle size of 0.1 mu m to 1.0 mu m, and the water reducing agent is a high performance water reducing agent based on melamine, naphthalene and polycarboxylic acid, and 0.1 to 1.0 part by weight based on 100 parts by weight of the binder shown in Table 1 . Vinylon fiber, glass fiber, polyvinylene fiber, aramid fiber and the like are used as the reinforcing material fiber. The size of the fibers used is 0.01 to 0.1 mm in diameter and 5 to 15 mm in length and a tensile strength of 1000 MPa or more is added in an amount of 0.1 to 1.0 part by weight based on 100 parts by weight of the binder.

When the ratio of water to binder is adjusted to 0.15 to 0.25, when the ratio of water to binder is less than 0.15, the adhering force to adhere to the surface of the aggregate of coarse aggregate decreases. If it exceeds 0.25, a part of the binder flows down to decrease the bending strength. The water / binder ratio is most preferably between 0.20 and 0.23.

On the other hand, permeable concrete should be adjusted to have a porosity of 15% or more because the coefficient of permeability is low when the porosity is below 15%, and thus it is not suitable for use in packing or interlocking blocks. Particularly, at the initial stage of construction, the permeability is higher than the reference value, but the permeability is drastically decreased due to the lapse of time, that is, the pores are clogged by the fine particles, so that the pore size is relatively increased, It is preferable to manufacture such that clogging does not occur.

Also, in order to use the water permeable concrete as a package structure, the compressive strength is preferably 326.53 kgf / cm 2, and the bending strength is preferably 51.02 kgf / cm 2 or more.

That is, in the present invention, the bottom ash coarse aggregate (3 to 13 mm) having a predetermined particle size is used as a main constituent material, and the binder is usually Portland cement, blast furnace slag cement, fly ash cement, nickel smelting slag, Slag, steel slag, silica fume as an admixture, diatomaceous earth, high performance hydrogels, melamine, naphthalene and polycarboxylic acid high performance water reducing agent, vinylon fiber, glass fiber, polyvinylene fiber, aramid fiber, (According to KSF 4419 Clause 8.1, "Test Method for Bending Strength") and a water permeability of not less than about 0.1 mm / sec (see KSF 4419, Section 8.4 "Permeability Test Method"), bending strength of not less than about 40.816 kgf / To produce various types of water permeable concrete products.

Hereinafter, the production process of the water permeable concrete product of the present invention will be described with reference to the drawings. 4 is a process diagram for explaining the manufacturing process of the water permeable concrete pavement or block according to the present invention. First, the binder, the water reducing agent, the admixture, the strength reinforcement, and the water are charged into the mixer at an appropriate mixing ratio and stirred for about 1 to 5 minutes to completely form the mortar (S200). Next, the mortar and the coarse aggregate are mixed in the mortar and mixed in a mixer for about 1 to 3 minutes to prepare a water permeable concrete composition (S300). The concrete composition is injected into a mold of a certain size (block product) Cure.

1 is a block product of various forms of the water permeable concrete according to the present invention. FIG. 2 is a photograph showing the water permeation phenomenon of the block product, and FIG. 3 is an embodiment showing a permeability testing apparatus.

Table 3 shows the materials of the water permeable concrete composition, and Table 4 shows the results of investigating the mixing ratio of the water permeable concrete composition and the physical properties of the product in various examples.

division designation sign density briefs Binders Portland cement OPC 2.6 Usually Portland cement (Ssangyong) Blast furnace slag cement BFSC 3.0 Blast furnace slag / Portland = 50/50 Fly ash cement FAC 2.5 Fly ash / Portland = 20/80 / Portland = 20/80 Fine aggregate Nickel smelting slag NiS 3.0 Gwangyang nickel smelter sewage slag 0.15 ~ 5㎜ Copper smelting slag CuS 3.8 LS NIKO sewed slag
0.3 to 5 mm Steel slag StS 3.4 Steel mill slag
0.1 to 3.0 mm Coarse aggregate Bottom ash BA 2.2 Boryeong Thermal Bottom Ash 3 ~ 13㎜ Mixed material Silica fume FS - 1 μm or less Diatomaceous earth DA - 1 μm or less Water reducing agent High performance water reducing agent SP - BASF Construction Polymers GmbH Melflux Strength stiffener Reinforcing fiber FB - Polyvinyl fiber

division Binder (parts by weight) Fine aggregate (weight part) Coarse aggregate
(Parts by weight) Admixture (part by weight based on 100 parts by weight of binder) Additives (parts by weight based on 100 parts by weight of binder) Water / binders Bending strength
(Kgf / cm2) Permeability coefficient
(Mm / sec) OPC BFSC FAC CuS NiS StS BA FS DA SP FB Example 1 100 - - 150 - - 300 5 - 0.2 1.0 0.20 45 0.28 Example 2 100 - - - 150 - 400 5 - 0.2 1.0 0.20 40 0.37 Example 3 100 - - - - 150 400 - 5 0.2 1.0 0.20 37 0.34 Example 4 - 100 - 150 - - 450 5 - 0.2 1.0 0.
20 42 0.53 Example 5 - 100 - 150 500 5 - 0.2 1.0 0.20 49 0.48 Example 6 - 100 - 150 450 - 5 0.2 1.0 0.20 47 0.38 Example 7 - - 100 150 - - 500 5 - 0.2 1.0 0.20 38 0.32 Example 8 - - 100 - 150 - 450 5 - 0.2 1.0 0.20 43 0.25 Example 9 - - 100 - - 150 450 - 5 0.2 1.0 0.20 42 0.26 Example 10 - 100 - - 170 - 500 5 - 0.2 1.0 0.20 50 0.29 Comparative Example 1 100 - - - - - 300 5 - 0.2 1.0 0.20 45 0.22 Comparative Example 2 100 - - - - - 400 5 - 0.2 1.0 0.20 31 0.54 Comparative Example 3 100 - - - - - 450 5 - 0.2 1.0 0.20 29 0.67 Comparative Example 4 100 - - - - - 500 5 - 0.2 1.0 0.20 26 0.73

As shown in Table 4, when the addition amount of fine aggregate is increased and the addition amount of coarse aggregate is increased, the bending strength gradually decreases while the permeability coefficient tends to increase. As a most preferable blending ratio, 100 parts by weight of blast furnace slag cement and 5 to 10 parts by weight of silica fume as an admixture, 0.1 to 0.2 parts by weight of polycarbamylether as a high-performance water reducing agent, and 1.0 to 2.0 parts by weight of vinylon fiber as an intensifying material are added to prepare a mortar slurry It is preferable that 50 to 250 parts by weight of nickel smelting slag and 300 to 600 parts by weight of bottom ash which is a coarse aggregate are mixed with fine aggregate as a fine aggregate to prepare a final water permeable concrete composition.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, and that various changes and modifications may be made therein without departing from the spirit and scope of the invention.

Through the efficient recycling of fly ash and bottom ash, which are solid waste generated in various smelters and coal-fired power plants in the present smelter, it is possible to nurture a new environmentally friendly concrete industry that can drastically reduce cement usage.

It can be used for construction materials such as noise-absorbing materials (soundproof walls), acid-resistant water pipes, electric poles, and structures because it is possible to produce chemical resistance, especially acid resistance, fire resistance and low shrinkage, which are disadvantages of cement concrete products.

Claims (3)

It is a water permeable concrete mixed with portland cement, blast furnace slag cement, fly ash cement and fine aggregate as refractory materials, bottom ash of thermal power plant as coarse aggregate, admixture, high performance water reducing agent and strength reinforcement as binder,
The blast furnace slag cement and the fly ash cement were each mixed with Portland cement at a ratio of 50:50 and 80:20,
Fine aggregate slag is nickel smelting slag, copper smelting slag and steel slag, and its grain size is 0.1 ~ 3.5㎜. Bottom ash, which is coarse aggregate, is classified into 3 ~ 13㎜ by aggregate generated from coal-fired power plant.
The water permeable concrete is composed of 50 to 250 parts by weight of fine aggregate, 300 to 600 parts by weight of coarse aggregate, 5 to 10 parts by weight of admixture of 100 parts by weight of binder, 100 parts by weight of binder, And 1.0 to 3.0 parts by weight based on 100 parts by weight of the binder, and the water is composed of water / binder in a weight ratio of 0.15 to 0.25. Permeable concrete composition.
The method according to claim 1,
Wherein the admixture is silica fume or diatomaceous earth and has a particle size of 0.1 mu m to 1.0 mu m, the high-performance water reducing agent is any one of melamine, naphthalene and carboxyethylether, and the strength reinforcing material is any one of vinylon fiber, glass fiber, polyvinylene fiber and aramid fiber Wherein the aggregate is an aggregate of the aggregate.
Wherein the mortar composition is from 5 to 10 wt% based on the weight of the binder, and the high-performance water reducing agent is from 0.1 to 10 wt% based on 100 wt% of the binder. And 1.0 to 3.0 parts by weight based on 100 parts by weight of the binder. The water is charged into the mixer at a weight ratio of water / binder ratio of 0.15 to 0.25 and mixed with stirring for about 1 to 5 minutes After the mortar is completely formed, the aggregate and the coarse aggregate are mixed in the mortar and mixed in a mixer for 1 to 3 minutes to prepare a water permeable concrete composition. The concrete composition is injected into a mold having a predetermined size to produce block products, Characterized in that the water-curing concrete product is placed in a sieve and natural cured.

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