KR20030003965A - Manufacturing methods of permeable pavement and block using the water-quenched blast furnace slag, pavement method using the same - Google Patents

Abstract

PURPOSE: Provided is a method for manufacturing concrete and pavement block with permeability and strength by using granulated slag, generated in the manufacture of blast furnace, as aggregate. CONSTITUTION: The permeable concrete and pavement block are manufactured by the following steps of: forming slag, generated after melting iron ore in the manufacture of blast furnace, into a shape of aggregate between 13-19mm; mixing slag aggregate, cement and water in a ratio of 100 : 30-70 : 15-25; and curing. The permeable concrete has compression strength of more than 180kg/cm¬2, bending strength of more than 30kg/cm¬2, and permeability coefficient of more than 0.01cm/sec. The paving method comprises the steps of: paving a filter on the road to be 5-10cm thickness; paving a permeable layer on the filter to be 10-15cm thickness; paving the above permeable concrete to be 7-10cm thickness.

Description

Manufacturing method of permeable concrete and permeable sidewalk block using handmade slug and road paving method using permeable concrete {Manufacturing methods of permeable pavement and block using the water-quenched blast furnace slag, pavement method using the same}

The present invention is a substitute aggregate for slugs generated after melting iron ore in blast furnace steelworks in the manufacture of pavement structures or sidewalk blocks, such as parking lots, bicycles, footpaths, parks, sports facilities, and other residential facilities. The present invention relates to a method for producing permeable concrete and permeable sidewalk blocks.

Recently, as urbanization and industrialization progress, pavement penetration rate for automobile roads, parking lots, bicycle facilities, sidewalks, parks, sports facilities, and other residential facilities is increasing, and asphalt concrete and cement concrete are mainly used as pavement materials. Is fulfilling. Most of these paving materials are impervious materials. In addition to the problems of rainwater infiltration, rainwater microorganisms do not live, and groundwater is insufficient. It is pointed out. In addition, as large-scale construction projects increase day by day, the development of environmental cities adopting so-called eco-friendly development techniques that organically link ecological spaces with the circulation use of various natural resources, including the shortage of construction materials such as sand and gravel, at various sites in Korea Measures are actively going on. In response to this, there is an active movement to recycle waste materials as a substitute material of existing construction materials, and accordingly, the need for development of alternative materials or recycling of industrial by-products is increasing.

Therefore, the present invention is made to solve the above problems, the slag generated from the blast furnace equipment of steel mills made of coarse aggregate or fine aggregate; cement; The method of manufacturing water-permeable concrete and water-permeable sidewalk blocks using water slag that can secure the required strength (uniaxial compressive strength and flexural strength) and water permeability required for the production of water-permeable concrete and permeable sidewalk blocks by optimizing the mixing ratio of water The purpose is to provide.

In addition, the present invention is to provide a paving method using water-permeable concrete that can facilitate drainage during rainfall by paving the slag generated in the blast furnace facility with a suitable thickness of cement and water in a predetermined thickness on the top layer of the roadbed. There is a purpose.

1 is a schematic view showing a comparison between the general packaging method and the water-permeable packaging method.

Figure 2 is a schematic diagram showing the general structure of a water-permeable concrete pavement according to the present invention.

Figure 3 is a graph showing the particle size distribution curve of the reclaimed slug which is the main part of the present invention.

4 is a graph showing the compressive strength-water mixing ratio relationship according to cement mixing ratio in water-permeable concrete according to the present invention.

5 is a graph showing the compressive strength-water mixing ratio relationship according to water mixing ratio in water-permeable concrete according to the present invention.

6 is a graph showing the relationship between the flexural strength-water mixing ratio according to the cement mixing ratio in water-permeable concrete according to the present invention.

7 is a graph showing the relationship between the flexural strength-water mixing ratio according to the water mixing ratio in water-permeable concrete according to the present invention.

8 is a graph showing the relationship between permeability-cement and water mixing ratio.

9 is a graph showing the relationship between permeability coefficient, compressive strength and flexural strength.

10 is a graph showing changes in bending strength and permeability coefficient according to cement mixing ratios.

In order to achieve the above object, the present invention, the first step of forming the slag generated after the melting of iron ore in the blast furnace steel to a predetermined size of aggregate; A second step of mixing the ratio of said slag slag: cement: water in the ratio of 100: 30-70: 15-25; And it provides a method for producing a water-permeable concrete comprising a third step of curing for a predetermined time.

In the present invention, the mixing ratio of the above-mentioned hand slag: cement: water is blended in a ratio of 100: 30 to 70:15 to 25, but the uniaxial compressive strength is within the range of 37.2kg / cm 2 to 378.5kg / cm 2, and the bending strength is 7.47. The water permeable sidewalk block obtained by the manufacturing method of the water permeable concrete produced in the range of kg / cm <2> -65.25kg / cm <2> and a permeability coefficient within the range of 5.32 * 10 <^-1> -1.80 * 10 <^-2> is provided.

In addition, the present invention comprises the steps of packing the filter in the hearth thickness of 5 ~ 10cm; Packing the semi-permeable layer 10-15 cm on the filter; And paving the water-permeable concrete produced by dissolving iron ore at the blast furnace steel in a ratio of 100: 30 to 70: 15 to 25, and packing permeable concrete with 7 to 10 cm. do.

Hereinafter, with reference to the accompanying drawings of Figure 1 will be described an embodiment of the present invention;

In the method of manufacturing permeable concrete and permeable sidewalk block using the handmade slug according to the present invention, the produced slug generated after melting iron ore in the blast furnace steel mill is manufactured to a predetermined size, and the required strength and permeability are appropriately mixed with water and cement. It is implemented to secure.

That is, in the present invention, the mixing ratio of the reclaimed slag: cement: water obtained in the blast furnace steelworks is blended in a ratio of 100: 30 to 70:15 to 25 to produce a concrete or sidewalk block having good water permeability. Concrete or press blocks formulation as described above is the unconfined compressive strength of 37.2kg / ㎠ ~ 378.5kg / it is within the range of ㎠, a bending strength within a range of from 7.47kg / ㎠ ~ 65.25kg / ㎠ and the permeability coefficient 5.32 × 10 ^{- It} exists in the range of 1-1.80 * 10 <^-2> .

In order to satisfy the required strength (uniaxial compressive strength, flexural strength) and permeability simultaneously in manufacturing the permeable concrete and the permeable sidewalk block in the above mixing ratio, the mixing ratio of water slag: cement: water is the most important factor. If it exceeds or falls short of the range, the strength is satisfied but permeability is not secured, or the permeability is secured but the strength is not satisfied. As a result, if the criteria of strength and permeability are not satisfied, it is important to set the optimum mixing ratio because it is meaningless as permeable concrete and permeable sidewalk blocks.

The optimum mixing ratio of reclaimed slag: cement: water in this example is 100: 60 to 70:20.

In addition, the present invention can be applied to pave the road using concrete manufactured by using the hand slag as described above. In this case, first, the filter is packed on the furnace with a thickness of 5 to 10 cm, and the roadbed permeable layer is packed on the filter with 10 to 15 cm. Thereafter, the water-permeable concrete produced with the mixture slag, cement and water in a ratio of 100: 30 to 70:15 to 25 is packed with 7 to 10 cm.

Referring to the characteristics of the water-permeable concrete or sidewalk block manufactured using the hand slag as described above in more detail as follows.

1 shows a comparison between a general paving method and a permeable paving method, and FIG. 2 shows a general structure of a water-permeable concrete pavement for a bicycle road.

As shown in the figure, in the case of a permeable pavement method, it is generally composed of a surface layer of 7 to 10 cm, a permeable subgrade of 10 to 15 cm thick, and a filter layer of 5 cm, depending on whether the vehicle passes. Currently, the method of manufacturing permeable concrete mainly uses foaming material or rare aggregates. In the process of forming continuous voids for drainage in concrete, material separation, reduction in strength and durability, etc. I have a problem that needs to be solved. Permeable pavement technology has different standards for each construction method, but generally meets the specification set forth in the specification of permeable pavement for bicycle roads (Ministry of Interior, 1997). In this regulation, the flexural strength of the surface material is based on 30kg / cm2, and the porosity is 12% or more and the permeability coefficient is 10 ^-2 cm / sec or more.

On the other hand, the most widely used blocks for paving sidewalks, driveways, plazas, parking lots, etc. are sidewalk concrete boards and concrete interlocking blocks for sidewalks, and their specifications are specified in KS F 4001 and KS F 4419, respectively. The sidewalk concrete plate means a plate made of concrete mainly for use on a sidewalk, and the concrete interlocking block for sidewalks means a block used for paving a sidewalk, a roadway, a plaza, and a parking lot. In both cases, the maximum size of the coarse aggregate is prescribed to use 13 to 19mm, and the current products mainly use crushed stone as fine aggregate, but in the present invention, a permeable side block is manufactured by using sewage slug as fine aggregate. It is characteristic. Permeable sidewalk blocks that use hand-made slug as fine aggregate should also meet the criteria of particle size, water absorption, etc. applied to existing sidewalk blocks, and the relevant regulations are concrete interlocking for concrete plates and sidewalks specified in KS F 4001 and KS F 4419. It complies with the main regulations for the manufacture of blocks, the details of which are shown in <Table 1> and <Table 2>.

When iron ore, coke, limestone, etc., which are raw materials of pig iron, are introduced into the blast furnace, and then heated by heating air at about 120 ° C., iron ore is dissolved by the combustion of coke and blast furnace slag (hereinafter slag) ) Is a by-product of this process. Slag discharged at about 1500 ℃ molten state is classified into slow cooling slag and quenching slag according to the treatment process. In other words, the slag in high temperature molten state is cooled and solidified by cooling and solidifying it for about 2 to 4 days by air cooling in a cooling station and water cooling by an appropriate amount of spraying, and quenching slag sprayed with a large amount of water and quenched. It is called hand slag. In general, slow cooling slag is bulky and has a crystalline structure, while hand slag has an amorphous or glassy structure.

Reclaimed slag is a lightweight and porous material and has a very high permeability. In particular, when the slag is mixed with cement and water, the slag is known to exhibit hydraulic properties due to the irritant action of the cement. This is called the latent hydroponic characteristics of the slag, and the cement is called a stimulant or accelerator because it plays a role in inducing the hydraulic expression of the slag. Therefore, when mixing and mixing the slag with cement, the cement as well as the hydraulic property of the cement itself In addition, the hydraulic properties of reclaimed slag can be expected.

In the present invention, in order to check the utilization and functionality of the handmade slag in the manufacture of pavement structure or block for block road, basic physical properties test of the slag, uniaxial compressive strength test, flexural strength test for concrete mortar using the hand slag as fine aggregate Permeability test was performed. That is, the effects of these factors on the uniaxial compressive strength, flexural strength and permeability coefficient of concrete mortar were analyzed by varying the mixing ratio of cement and water in slag.

The wood slag used in the present invention was subjected to slag samples generated from the blast furnace facility of Pohang Steel. The concrete mortar was mixed with a total of 26 concrete mortars by varying the weight ratio of slag: cement: water. Table 3 shows the test items related to the basic and mechanical properties performed in the present invention.

As a result of the physical property test of the handmade slag used in the present invention, the granulation rate is 3.4, slightly exceeding the range of granulation rate of fine aggregates 2.3 to 3.1, and the specific gravity is 2,18 and the unit weight is 1013 kg / cm 3, which corresponds to the lightweight material. In addition, the absorption rate was 47%, which was higher than that of general fine aggregates. The particle size of the hand slag is equal to the grain size of sand, and the particle size distribution curve is shown in FIG.

In the present invention, the compressive strength, flexural strength, and permeability coefficients of the permeability test were measured for 26 types of concrete mortars in which the mixing ratio of cement and water in slag was changed into 7 types and 4 types, respectively. <Table 4> is as follows.

4 and 5 show the effect of the addition amount of cement and water on the uniaxial compressive strength, the uniaxial compressive strength of the test specimens up to 378.5kg / ㎠ according to the mixing ratio of cement and water (see specimen No. 24, <Table 6>) It appeared in the range of ˜37.2 kg / cm 2 (Sample No. 1), the size of which increased as the mixing ratio of cement and water increased. That is, in the same cement blending ratio, the uniaxial compressive strength increased as the water blending ratio increased, and as the cement blending ratio increased in the same water blending ratio, the uniaxial compressive strength increased. In other words, in the case of permeable concrete with many voids, the larger the water-cement ratio, the less the internal voids and the higher the strength.

6 and 7 show the effect of the addition amount of cement and water on the bending strength, the bending strength of the specimen is up to 65.3kg / ㎠ (specimen No. 24) ~ 7.5kg / ㎠ (specimen No. 1) according to the cement and water mixture ratio Range is proportional to the magnitude of uniaxial compressive strength. That is, the magnitude of the flexural strength increases as the mixing ratio of seam and water increases, similar to the uniaxial compressive strength. Considering only the flexural strength criteria (30kg / ㎠) of permeable concrete presented in the specification of permeable pavement for bicycle roads (Ministry of Interior, 1997), specimens 12, 16, 19, 20, 22, 24, and 26 meet the requirements. .

Fig. 8 shows the effect of the mixing ratio of cement and water on the permeability coefficient. As a result of the water level permeation test, the permeability coefficient decreases as the mixing ratio of cement and water increases, and the effect of water and slag ratio on the permeability coefficient is that the cement / slag ratio It was found to be somewhat larger than the effect on the coefficient. This means that as the uniaxial compressive strength and flexural strength increase, the permeability coefficient decreases. Therefore, in order to satisfy the required strength and permeability, it is necessary to derive the appropriate mixing ratio, and in case of permeability coefficient of ^10-2 cm / sec or more, water / slag ratio of 25% and 30%, While the acceptance criteria were not met, water / slag ratios of 15% and 20% were found to meet the standards in all blending ratios except for cement / slag ratios of 70%.

Figure 9 shows the relationship between permeability coefficient, uniaxial compressive strength and flexural strength, the correlation between specimen strength and permeability is not good, and the uniaxial compressive strength that satisfies the target permeability coefficient 10 ^-2 cm / sec or more is about 200 kg. The flexural strength was about 33 kg / cm 2 or less.

Figure 10 shows the change in the bending strength and permeability coefficient of the specimen according to the cement mixture ratio in order to determine the range of the appropriate barb ratio of water and cement satisfying the required strength and permeability coefficient, the water / slag ratio is 25%, 30% In this case, the permeability coefficient was less than 10 ^-2 cm / sec, which did not satisfy the criteria. In FIG. 10, as the cement / slag ratio was increased, the coefficient of permeability decreased and the flexural strength increased, indicating that there is an inverse relationship between the specimen strength and permeability. In conclusion, the compounding ratio that satisfies the bending strength criteria of 30kg / ㎠ (marked with a thin dotted line) can be divided into water / slag ratio of 20%, cement / slag ratio of 60% and 70%, and a permeability coefficient of 10 ^-2 cm / sec. If the content is satisfied (indicated by the bold dotted line), all compounding ratios except 70% of cement / slag are applicable. Accordingly, it can be seen that the water / slag ratio is 20% and the cement / slag ratio is 60%, which satisfies both the strength and water permeability standards.

The present invention described above is not limited to the above-described embodiments and drawings, and various permutations, modifications, and changes can be made without departing from the technical spirit of the present invention. It will be apparent to those who have

As described above, according to the present invention, after forming the slag of waste material obtained from blast furnace steel as rolled aggregate or fine aggregate, the slag slag is mixed in an appropriate ratio with cement and water to permeable concrete and permeable sidewalk In addition to securing the required strength (uniaxial compressive strength, bending strength) and permeability required for block manufacturing, the hand slag has excellent engineering characteristics such as light weight and latent hydraulic properties, and its shape is irregular and porous material. Since it is made of, as the aggregate aggregate of the permeable concrete can be used as a substitute for the construction aggregate has the effect of reducing the resource recycling aspect and construction costs.

Claims (9)

A first step of forming slag generated after melting iron ore in blast furnace steel as aggregate having a predetermined size; A second step of blending the slag aggregate: cement: water in a ratio of 100: 30 to 70:15 to 25; And Third step of curing for a predetermined time Method of producing a permeable concrete comprising a. The method of claim 1, The slag aggregate of the second step: cement: water mixing ratio of 100: 60 to 70: 20 method for producing a water-permeable concrete. The method of claim 1, The slag aggregate is a method of producing a water-permeable concrete consisting of a water slag quenched by spraying a slag of hot molten state with a large amount of water. The method of claim 3, wherein A method for producing permeable concrete in which the maximum dimension of the wood slag is in the range of 13 to 19 mm. The method according to any one of claims 1 to 4, The slag slag: Cement: Method of producing a water-permeable concrete uniaxial compressive strength according to the mixing ratio of water satisfies a value of 180kg / ㎠ or more. The method according to any one of claims 1 to 4, The method of producing a water-permeable concrete that satisfies the value of 30kg / ㎠ or more according to the mixing slag: cement: water mixing ratio. The method according to any one of claims 1 to 4, The slag slag: Cement: Water permeability coefficient according to the mixing ratio of the water production method of permeable concrete that satisfies the value of 10 ^-2 cm / sec or more. A permeable sidewalk block obtained by the method for producing permeable concrete according to claim 1. Packing the filter on the furnace in a thickness of 5 to 10 cm; Packing the semi-permeable layer 10-15 cm on the filter; And Paving the permeable concrete produced by melting slag and cement and water in the blast furnace steelworks is 100: 30 ~ 70: 15 ~ 25 to 7 ~ 10cm Road paving method comprising a.