KR102111530B1 - Block for sidewalk and roadway comprising ferronickel and furnace slags - Google Patents

Abstract

The present invention relates to a method of manufacturing a block for a sidewalk and a roadway with improved water permeability and durability, the method including the steps of: filling a composition for a base layer comprising ferronickel slag, slag cement, and stone flour in a molding frame; manufacturing a base layer by pressing the molding frame; filling a composition for a surface layer comprising ferronickel slag, slag cement, and a colorant on the base layer; manufacturing a block molded body having the surface layer formed on the base layer by pressing the molding frame; and curing the block molded body.

Description

Perforated block with improved permeability and durability, including ferronickel slag and blast furnace slag, and a method for manufacturing the same. {BLOCK FOR SIDEWALK AND ROADWAY COMPRISING FERRONICKEL AND FURNACE SLAGS}

The present invention relates to a block for a roadway including a ferronickel slag and a blast furnace slag, and a method for manufacturing the same, and recycles the ferronickel slag and blast furnace slag, which are wastes generated in the steel industry, to improve permeability and durability. It relates to a dragon block and a method for manufacturing the same.

Ferronickel slag and blast furnace slag are representative byproducts of the steel industry.

Ferronickel slag (FeNi slag) is a slag generated in the manufacturing process of ferronickel used as a raw material in the manufacture of stainless steel among steel products.It is generally composed of 25-40 wt% MgO and 45-60 wt% SiO ₂ and, also become crystalline in the other Enschede tight (Enstatite) (MgOSiO ₂₎ onto the forsterite (forsterite) (2MgOSiO ₂₎ depending on the cooling method. In addition, the granular form of ferronicyl slag has a particle size of less than 10 mm.

In addition, the blast furnace slag is produced in the furnace together with pig iron, and is not provided with a crystalline phase and is formed into amorphous sand-like particles. The blast furnace slag is used as a cement raw material, concrete admixture, etc. after pulverization, and the fine powder of the blast furnace slag shows the effect of reducing the rate of hydration heating and suppressing the temperature rise of concrete in the manufacture of concrete, long-term strength, watertightness, anti-rusting, chemical It shows the effect of improving resistance and the like.

In general, a block for a pedestrian road is made up of a lower layer in close contact with the ground and an upper layer in contact with a person or a vehicle as in Korean Patent Publication No. 10-1673838, and the components and contents of each layer are different to improve the durability of the upper layer. It is molding. By filling the voids generated during the molding of these blocks with aggregate, it is possible to improve the durability of the block while ensuring permeability. On the other hand, when considering the fact that the fluidity and strength of concrete are improved when applying the composite slag fine aggregate containing ferronickel slag and blast furnace slag as in Korean Patent Registration No. 10-1999010, if such slag is used, the block of the road block It is expected that water permeability can be secured while improving durability.

Republic of Korea Patent Registration No. 10-1673838 Republic of Korea Registered Patent Publication No. 10-1999010

The present invention has been devised in view of the problems of the prior art as described above, and an object of the present invention is to provide a block for a roadway with improved water permeability and durability by recycling ferronickel slag and blast furnace slag, wastes generated in the steel industry. .

In particular, it is an object of the present invention to provide a method for manufacturing a block for a high-intensity pedestrian barrier while reducing the amount of cement, water, admixture, etc. through optimization of process conditions.

In addition, an object of the present invention is to provide a block for a pedestrian barrier with improved water permeability and durability through an optimized method of manufacturing the block for a pedestrian barrier.

In addition, an object of the present invention is to provide a method for manufacturing a block for a pedestrian barrier, which reduces the strength, water permeability, and defect rate of a block for a pedestrian barrier manufactured by optimizing the conditions of a molding process.

The method for manufacturing a block for a pedestrian barrier according to the present invention for achieving the above object is a method for manufacturing a block for a pedestrian barrier formed by laminating a base layer and a surface layer, a base layer comprising ferronickel slag, slag cement, and stone powder in a molding frame Filling the composition for the composition, pressing the forming mold to prepare a base layer, filling the composition for the surface layer containing ferronickel slag, slag cement, and a colorant on the base layer, pressing the molding mold to It characterized in that it comprises the step of manufacturing a block molded body having a surface layer formed on a base layer, and curing the block molded body.

At this time, the ferronickel slag constituting the composition for the base layer may have a particle size of 4 to 8 mm, and the ferronickel slag constituting the composition for the surface layer may have a particle size of 2 to 4 mm.

In addition, the curing step may be to cure by exposing the block molded body to steam below 60 ° C. for 6 hours.

The block for the roadway according to the present invention is a recycled ferronickel slag and blast furnace slag, which are wastes generated in the steel industry, and have improved water permeability and durability.

In addition, by optimizing the process conditions, while reducing the amount of cement, water, admixtures, etc., the manufacturing process can be optimized to improve strength, water permeability and durability, and reduce the defect rate, making it possible to produce eco-friendly and high-quality blocks for high-quality secondary vehicles.

1 is an exemplary view of a block for a pedestrian crossing according to the present invention (a) and a block for a pedestrian crossing according to the prior art (b).

Hereinafter, the present invention will be described in more detail. The terms or words used in the present specification and claims should not be interpreted as being limited to ordinary or lexical meanings, and the inventor can appropriately define the concept of terms in order to best describe his or her invention. Based on the principle that it should be interpreted as meanings and concepts consistent with the technical spirit of the present invention.

The block for a pedestrian crossing according to the present invention is formed by stacking a base layer 10 and a surface layer 20, as shown in FIG. 1 (a). At this time, the base layer 10 is formed by a composition for a base layer containing ferronickel slag, slag cement, and stone powder, and the surface layer 20 is a surface layer composition comprising ferronickel slag, slag cement, and a colorant. Can be formed by. In general, the block for the roadway includes a permeable channel 30 in the form of a perforation or a flow path in the surface layer 20 as shown in FIG. 1 (b) to ensure permeability. Although the water permeability of the block for the roadway is secured through the water permeation channel 30, the present invention achieves excellent water permeability without such a water permeation channel.

Since the block for the roadway can secure water permeability and durability by the composition and manufacturing method of the base layer and the surface layer, it is necessary to optimize the composition of the composition and the block applied to each layer for this purpose.

In the present invention, as a main raw material constituting the block, a slag cement including ferronickel slag and blast furnace slag is applied, and desired physical properties are obtained by varying the particle size of the ferronickel slag contained in the composition applied to the base layer and the surface layer. .

In other words, the ferronickel slag constituting the composition for the base layer has a particle size of 4 to 8 mm, and the ferronickel slag constituting the composition for the surface layer has a particle size of 2 to 4 mm, and thus is used for the block for such a pedestrian barrier. Suitable physical properties are obtained.

Since the base layer should be excellent in water permeability by being grounded to the ground, if the particle size of the ferronickel slag used is 8 mm or less, it is not particularly limited in size, and thus can be easily obtained through the primary classification process. However, the ferronickel slag constituting the surface layer is classified and used to have a particle size in the range of 2 to 4 mm, and for this purpose, the ferronickel slag is repeatedly subjected to a second or more classification process to adjust the particle size. By using such a ferronickel slag, it is possible to manufacture a block which improves the surface roughness of a base layer to which a person or vehicle is grounded and which improves surface durability.

In addition, the slag cement constituting the composition for the base layer and the surface layer is a mixture of portland cement and blast furnace slag, and generally shows a tendency to increase in strength as the content of portland cement increases. In the present invention, the content of blast furnace slag is 40 to 40. The content of blast furnace slag is increased by using 60% by weight of slag cement.

The composition for the base layer constituting the base layer includes ferronickel slag, slag cement, and stone powder, and the composition for the surface layer constituting the surface layer may include ferronickel slag, slag cement, and a colorant.

Specifically, the composition for the base layer may be composed of 70 to 80% by weight of ferronickel slag, 5 to 10% by weight of slag cement, and 15 to 20% by weight of stone powder.

In addition, the composition for the surface layer may be composed of 50 to 54% by weight of ferronickel slag, 45 to 49% by weight of slag cement, and 0.1 to 1% by weight of a colorant.

The stone powder constituting the composition for the base layer should be uniformly mixed together with ferronickel slag and slag cement, so that the particles are classified and used to have a particle size of 4 to 8 mm. In addition, when the content of the stone powder is increased, the proportion of water must be increased in the molding process, and as a result, it is difficult to optimize the process conditions, so it is necessary to adjust the amount in the range of 15 to 20% by weight.

In addition, in using the ferronickel slag as a raw material, compatibility can be increased by using after surface treatment. In particular, it has been shown that the properties of a block for a roadway to be manufactured can be improved by using a surface after treating a ferronickel slag used in a composition for a base layer that requires water permeability and surface strength.

The surface treatment may be performed by a process of mixing the ferronickel slag powder and the resin composition. For example, the surface treatment can be performed by mixing 1 to 10 parts by weight of the resin composition with respect to 100 parts by weight of the ferronickel slag used in the composition for the base layer.

When the surface treatment with the resin composition was adsorbed on the surface of the ferronickel slag particles, it was found that the uniformity of mixing can be improved when mixing each composition.

It is preferable to use a hydrocarbon-based polymer containing a polar group as the resin constituting the resin composition. Examples of such polymers are epoxy-modified polystyrene copolymers, ethylene-anhydrous ethylene-acrylic acid copolymers, ethylene-ethyl acrylate copolymers, ethylene-alkyl acrylate-acrylic acid copolymers, maleic anhydride modified high density polyethylene, ethylene-alkyl methacryl And any one of a rate-methacrylic acid copolymer, an ethylene-butyl acrylate copolymer, an ethylene-vinyl acetate copolymer, and a maleic anhydride-modified ethylene-vinyl acetate copolymer.

Hydrocarbon-based polymers containing such polar groups are also used as compatibilizers in the manufacturing process of plastic molded products. In the present invention, in particular, 80 to 100 weight of 2-phenoxyethylacrylic acid monomer or 2-hydroxy-3-phenoxypropyl acrylic acid monomer It was found that the epoxy-modified polystyrene copolymer having side chains formed by polymerizing 1 to 30 parts by weight of 3,4-epoxy-1-butene as a main chain to form a side chain exhibits remarkable effects when used as a resin composition for surface treatment.

The resin composition may be prepared by mixing 20 to 40 parts by weight of an organic solvent with respect to 100 parts by weight of the epoxy-modified polystyrene copolymer, and mixing the resin composition and the ferronickel slag for 10 minutes to 1 hour using a mixer. After that, the surface-treated ferronickel slag powder can be prepared by heat treatment at 150 to 180 ° C. for 5 to 10 minutes.

In addition, the block for the sidewalk is preferred that the thickness ratio of the base layer and the surface layer is 7: 3 to 9: 1, and the thickness of the surface layer can be manufactured to an appropriate thickness to match the ratio according to the use purpose of the block. This can be easily adjusted through the manufacturing process of the block for the roadway according to the present invention.

In addition, the composition for the base layer and the surface layer composition for forming the block is preferably added in an amount of 0.01 to 1% by weight based on 100% by weight of the composition during the molding process. It was found that by mixing a small amount of water, homogeneous mixing of the composition is possible, thereby improving the physical properties of the prepared block. However, when too much water is added, a phenomenon in which a specific component is unevenly agglomerated occurs, thereby deteriorating physical properties.

The block for the roadway according to the present invention is formed of a structure including a base layer and a surface layer composed using the composition for the base layer and the composition for the surface layer, and may be manufactured through a process of manufacturing a base layer and a process of laminating a surface layer on the base layer. Can be.

Specifically, the block for the sidewalk is filled with a composition for the base layer in a molding frame, a step of preparing a base layer by pressing the molding frame, a step of filling the composition for the surface layer on the base layer, and pressing the molding frame By manufacturing a block molded body having a surface layer formed on the base layer, it may be manufactured through the step of curing the block molded body.

The block molded body has different durability, in particular, edge strength, depending on mixing conditions, filling conditions, and curing conditions for preparing the composition for the base layer and the surface layer.

When mixing the composition for the base layer and the surface layer, a conventional mixer is used, but the mixing time is preferably 45 to 55 seconds. When mixing for too long, aggregate separation occurs, and even if the mixing time is too short, the mixture becomes uneven. It is preferable to prepare each composition to be filled in a molding mold by mixing at a mixing time.

In addition, after adding the composition for the base layer and the surface layer to the molding frame, in particular, it is possible to achieve uniform mixing by imparting vibration to the molding frame, and the effect of improving the durability of the manufactured block even with a vibration of 1 to 5 seconds. Can get

In the prior art, the process of supplying the composition during the molding process is performed at a vibration speed of 2,000 to 2,100 rpm for 1 to 1.1 seconds, and the compression process is performed at a vibration speed of 2,300 to 2,400 rpm for 1.2 to 1.3 seconds. During the process, the composition supplying process is performed at a vibration speed of 2,100 to 2,200 rpm for 1.3 to 1.5 seconds, and a vibration speed of 2,500 to 2,600 rpm for 1.5 to 1.6 seconds. The compressive strength and flexural strength increased by about 10 to 15% due to the difference in the process conditions, which is a result suggesting that strict control of the process conditions is necessary to improve the strength of the molded body.

In addition, by optimizing the curing conditions, it is possible to eliminate the defect of the edge of the block is broken. To this end, in the present invention, the block molded body is cured by exposing it to steam below 60 ° C. for 6 hours. By adopting these curing conditions, it is possible to rapidly cure the curing conditions according to the general block production, and it is possible to manufacture a block having excellent durability even if the content of stone powder is reduced.

In order to evaluate the performance of the block for a roadway according to the present invention, a test specimen was prepared and tested as follows.

Compositions for the base layer and the surface layer were prepared in the same ratio as in Table 1. In Table 1, the content is by weight, and as the slag cement, Portland cement and blast furnace slag were used as slag cement in a weight ratio of 1: 1. In addition, 0.02% by weight of water with respect to 100% by weight of the composition was added when each composition was injected into the molding die.

The ferronickel slag is 40 parts by weight of an organic solvent based on 100 parts by weight of an epoxy-modified polystyrene copolymer formed by polymerizing 20 parts by weight of 20 parts by weight of 3,4-epoxy-1-butene as 100 parts by weight of a 2-phenoxyethyl acrylic acid monomer. After mixing for 20 minutes using a mixer, and then heat-treated at 180 ° C. for 10 minutes, surface-treated ferronickel slag powder was used. In addition, in Comparative Example 4, ferronickel slag powder without surface treatment was used.

The ferronickel slag was separated into particles having a particle size of 4 to 8 mm and particles having a particle size of 2 to 4 mm through a crushing and classification process, and then surface treated or used as such, and the particle size of 4 to 8 mm. Phosphorus particles were used for the base layer, and particles having a particle size of 2 to 4 mm were used for the surface layer.

In Example 1 and Comparative Examples 1 and 2, the thickness of the base layer and the surface layer was 8: 2, and a block molded body was prepared, followed by curing by exposure to steam at 60 ° C. for 6 hours, and in Comparative Example 3, the thickness of the base layer and the surface layer was increased. The block molded body was prepared to be 8: 2, and then cured at room temperature for 20 days.

Example 1 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Base
Composition Nickel slag 75.4 75.4 75.5 75.4 75.4 cement 5.66 5.66 5.65 5.66 5.66 Stone powder 18.85 18.85 18.85 18.85 18.85 For surface
Composition Nickel slag 51.72 51.72 51.65 51.72 51.72 cement 47.6 47.6 47.65 47.6 47.6 coloring agent 0.62 0.62 0.7 0.62 0.62

The compressive strength was measured according to KS F 2405, the flexural strength was measured according to KS F 2048, and the permeability coefficient was measured according to KS F 4419.

In addition, after the block specimens made of a size of 30 × 30 cm and a thickness of 10 cm are freely dropped onto the concrete floor at a height of 1.5 m with the corner portion down, are the edges of the block broken by impact on the concrete floor and broken? Was evaluated. The drop test was conducted 10 times, and it is good if the corner part is not damaged even after the 10 tests, and if the corner part breakage occurs in 5 to 10 drop tests, it is usually evaluated as a failure when the corner part breakage occurs in less than 5 drop tests. Did.

Compressive strength (MPa) Flexural strength (MPa) Permeability coefficient (cm / s) Edge strength Example 1 37.6 9.1 0.38 Good Comparative Example 1 26.6 6.8 0.37 usually Comparative Example 2 25.3 6.1 0.35 Bad Comparative Example 3 29.5 7.2 0.26 Bad Comparative Example 4 37.8 8.7 0.38 usually

Looking at the results of Table 2, the specimen according to Example 1 exhibited excellent physical properties in both compressive strength, flexural strength, and permeability coefficient, and even in the drop test, a phenomenon in which the edge portion was not damaged does not appear, and thus a block having excellent durability can be manufactured. It appeared to be.

On the other hand, in the case of Comparative Example 1 with different types of admixture, the permeability coefficient was good, but exhibited low values in compressive strength and flexural strength, and it was evaluated that the strength of the edge portion was weak in the free fall test.

In addition, in the case of Comparative Example 2, which does not contain a admixture, a phenomenon in which edges are broken occurs, indicating that the overall durability of the block is insufficient.

In addition, even in the case of Comparative Example 3 with different curing conditions, the phenomenon of cracking of the edges occurred and the permeability coefficient was relatively low. These results suggest that the properties of blocks manufactured according to curing conditions are affected.

In addition, in Comparative Example 4 in which ferronickel slag was used without surface treatment, excellent physical properties were exhibited in compressive strength, flexural strength, and permeability coefficient, but the edge strength was insufficient. This was considered to be a problem caused by the low mixing uniformity of each component, and it was found that the pre-treatment process of the ferronickel slag also affects the properties of the block.

The present invention has been described with reference to preferred embodiments, as described above, but is not limited to the above embodiments and various modifications and modifications by those skilled in the art to which the invention pertains without departing from the spirit of the present invention Changes are possible. Such modifications and variations are to be regarded as falling within the scope of the invention and appended claims.

10: base
20: surface layer
30: pitcher

Claims (3)

As a method for manufacturing a block for a roadway made of a base layer and a surface layer are laminated,
Filling the molding frame with a composition for a base layer comprising ferronickel slag, slag cement, and stone powder;
Preparing a base layer by pressing the molding frame;
Filling a composition for a surface layer comprising ferronickel slag, slag cement, and a colorant on the base layer;
Manufacturing a block molded body having a surface layer formed on the base layer by pressing the molding frame;
Curing the block molded body;
It includes,
The ferronickel slag constituting the composition for the base layer has a particle size of 4 to 8 mm, and the ferronickel slag constituting the composition for the surface layer has a particle size of 2 to 4 mm,
The ferronickel slag is a ferronickel slag surface-treated by mixing 1 to 10 parts by weight of a resin composition with respect to 100 parts by weight of ferronickel slag,
The resin constituting the resin composition is a main chain of 80 to 100 parts by weight of 2-phenoxyethyl acrylic acid monomer or 2-hydroxy-3-phenoxypropyl acrylic acid monomer, and 1 to 30 parts by weight of 3,4-epoxy-1-butene Method for producing a block for a roadway, characterized in that the epoxy-modified polystyrene copolymer to form a side chain by polymerization.
delete The method according to claim 1,
In the curing step, the block molding body is exposed to steam at 60 ° C. or lower for 6 hours to cure the block for a pedestrian barrier.

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