JP4292953B2 - Permeable roadbed material, manufacturing method thereof, and water permeable equipment - Google Patents

Description

TECHNICAL FIELD The present invention relates to a water-permeable roadbed material, a method for producing the same, and water-permeable fittings, and specifically, steel slag such as blast furnace slow-cooled slag, blast furnace granulated slag, and steelmaking slag, which are by-products during steel production. Permeable roadbed material, further permeable roadbed material to which at least a carbonaceous material of a latent hydraulic substance, a pozzolanic reactive substance or a carbonaceous material is added according to the need for increase in bearing capacity or purification of water quality, and the like The present invention relates to a manufacturing method and a water permeable equipment using the water permeable roadbed material.

  Permeable pavement is called out socially as an effective means to recharge groundwater, suppress the heat island phenomenon, and prevent noise. However, the current water-permeable pavement can hardly be applied to the roadway part because it has a lower supporting capacity of the roadbed part because it penetrates rainwater to the groundwater part, and is only applied to the sidewalk part.

  As a roadbed material for roadway permeable pavement, a permeable roadbed material generally uses a cement paste material in which the roadbed part has a single grain structure and cement material and water are kneaded to maintain the bearing capacity. It has been known.

For example, Patent Document 1 discloses an invention related to water-permeable pavement having a structure using carbide in a filter layer, and Patent Document 2 includes water-permeable lean concrete using self-hardening steel slag. The invention relating to the roadbed material is further disclosed in Patent Document 3 as 50 to 70% by mass of recycled aggregate having a particle size of 5 to 30 mm, 23 to 47% by mass of granulated blast furnace slag, a reinforcing agent and strength after solidification. Inventions relating to water-permeable roadbed materials using regenerated aggregates containing 3 to 7% by mass of an additive comprising an alkali stimulant for increasing the water content are disclosed.
JP 2000-3198110 A JP 2000-319811 A JP 2002-146709 A

  In the invention disclosed in Patent Document 1, since the carbide is used for the filter layer for purifying the carbide, the work of replacing the carbide whose purification effect has been inevitably occurs, and the work requires a large amount of cost. .

  Moreover, in the invention disclosed by patent document 2, although the water-permeable lean concrete using the steel slag which has self-hardening is used, it is expensive for the operation | work which knead | mixes a cement paste with steel slag, and it is material immediately after kneading | mixing. Since the hardening of the material progresses rapidly, temporary placement before construction cannot be performed, and it is necessary to perform construction immediately after kneading, which makes process management during construction complicated.

  Furthermore, in the invention disclosed in Patent Document 3, a granulated blast furnace slag and a reinforcing agent are mixed with a recycled aggregate having a particle size of 5 to 30 mm to obtain a permeable roadbed material. Since the latent hydraulic variation is large and the old material does not exhibit the latent hydraulic property, it is considered that the supporting force as the roadbed material is not stable, and it is difficult to apply to the permeable pavement for roadways. In addition, although it is possible to secure a supporting force by adding an enhancer, it is necessary to adjust the blending for each recycled material due to the large variation in the base material, and it is difficult to manage the amount added.

  The objective of this invention is providing the water-permeable roadbed material which can improve the stability of quality, and the simplicity of manufacture, its manufacturing method, and water-permeable equipment.

As characteristics required for water-permeable roadbed materials, it has a gap necessary for allowing rainwater to permeate into the lower filter layer or roadbed and a sufficient water permeability coefficient, and sufficient supporting force as a roadbed material for roadways. Is to have. Since there is no JIS standard for hydraulic conductivity, Table 1 shows examples of target values for hydraulic conductivity (cm / s), and Table 2 shows uniaxial compressive strength (N / mm ² ), which is a standard for bearing capacity, and corrected CBR values. (%) JIS standard value.

  The “water permeability coefficient” means a proportional coefficient based on the relationship that the permeation speed of the water flowing through the gap in the porous body is proportional to the water gradient. The “uniaxial compressive strength” means the maximum compressive stress of the specimen obtained by a uniaxial compression test while allowing the columnar specimen to swell laterally. Furthermore, the “corrected CBR value” is an index indicating the quality standard of the roadbed material and the embankment material, and is the maximum when the layer is divided into three layers and fixed 92 times in accordance with the method shown in JIS A1211. The CBR value corresponding to the required degree of compaction with respect to the dry density.

The larger the hydraulic conductivity, the better, but the target value of the hydraulic conductivity in the roadbed when heavy rain is assumed is 1 × 10 ⁻³ (cm for the upper roadbed material as shown in Table 1. / S) or more, and in the case of a lower layer roadbed material, it is 1 × 10 ⁻⁴ (cm / s) or more. In addition, as shown in Table 2, the uniaxial compressive strength (N / mm ² ) and the corrected CBR value (%) are HMS (for upper layer roadbed material), MS (for lower layer roadbed material), and CS (for lower layer roadbed material). And different.

  In order to obtain a sufficient hydraulic conductivity, it is necessary to remove the fine aggregate portion from the aggregate for the roadbed, but this makes it impossible to obtain a sufficient supporting force as the roadbed material. For this reason, until now, the water-permeable pavement could hardly be applied to the roadway portion, and the drainage pavement in which only the asphalt portion was water-permeable was common as the roadway pavement.

  Therefore, in the present invention, a steel slag material having latent hydraulic properties (property that reacts with water in the presence of an appropriate stimulant to form a hydrate with low solubility and harden) is used as the water-permeable roadbed material. Cement-based hydraulic substance (substance that reacts with water and hardens itself) to ensure the bearing capacity required as roadbed material for roadways corresponding to the number of vehicles passing through, weight, etc. Mixing as additives with pozzolanic reactive substances such as fly ash (substances that do not harden themselves but react easily with calcium hydroxide in the presence of water to produce insoluble and curable compounds) It is desirable to do. Furthermore, in order to purify permeated water from rainwater, it is desirable to mix a carbonaceous material such as activated carbon.

In the present invention, 50 to 90% by mass of blast furnace slow-cooled slag or steelmaking slag having a particle size of 5 to 40 mm, 50 to 10% by mass of granulated blast furnace slag having a particle size of 10 mm or less, and 1 to 10 carbonaceous materials. It is a water-permeable roadbed material characterized by containing mass% .

  The water-permeable roadbed material according to the present invention is further a latent hydraulic substance having a property of reacting with water in the presence of a suitable stimulant to form a hydrate having low solubility and curing, or is cured by itself. Although it does not have properties, if it contains 1 to 5% by mass of a pozzolanic reactive substance that easily reacts with calcium hydroxide in the presence of water and forms an insoluble and curable compound, the support capacity can be improved. It is possible and desirable.

Since these water-permeable roadbed materials according to the present invention contain 1 to 10% by mass of a carbonaceous material, the water quality can be purified .
As described above, the present invention is based on the water-permeable roadbed material using the latent hydraulic properties of steel slag, and if necessary, improves the bearing capacity by mixing additives or water quality by mixing carbonaceous materials. It is a water-permeable roadbed material that can also be purified. That is, the water-permeable roadbed material according to the present invention is a blast furnace granulated slag that exists between particles of blast furnace slow-cooled slag or steelmaking slag that are at least partially separated from each other and particles that are separated from each other. And having a supporting force required as a roadbed material and water permeability of rainwater.

From another point of view, the present invention relates to a blast furnace slow-cooled slag or steelmaking slag having a particle size of 5 to 40 mm, and 50 to 90% by mass of granulated blast furnace slag having a particle size of 10 mm or less. The mixture is fed to the crushing and sizing equipment or mixing equipment and mixed, and then the mixture is mounted on a belt conveyor disposed below the crushing and sizing equipment or mixing equipment, and is placed above the belt conveyor. It is a method for producing a water-permeable roadbed material characterized by adding at least a carbonaceous material of a latent hydraulic material, pozzolanic reactive material or carbonaceous material cut out from a silo to a mixture mounted on a belt conveyor. .

From another point of view, in order from the lower layer, the filter layer, blast furnace slow-cooled slag having a particle size of 5 to 40 mm or steelmaking slag 50 to 90% by mass, and granulated blast furnace slag 50 to 10 mass having a particle size of 10 mm or less. % And a permeable roadbed material containing 1 to 10% by mass of a carbonaceous material, a base layer, and a surface layer.

  By using the steel slag material having latent hydraulic properties according to the present invention, since it is inexpensive and can improve the stability of quality and the simplicity of production, it can be sufficiently used for pavement for roadways, An excellent water-permeable roadbed material can be manufactured also from the viewpoint. For this reason, by using this water-permeable roadbed material, it can be sufficiently used for pavement for roadways and can provide a water-permeable equipment excellent from the viewpoint of environmental conservation.

Hereinafter, the best mode for carrying out the water-permeable roadbed material, the manufacturing method thereof, and the water-permeable fitting according to the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a cross-sectional view showing a configuration of a roadway permeable pavement 1 using the permeable roadbed material 6 of the present embodiment.

The water-permeable pavement 1 for roadway of this Embodiment is equipped with the filter layer 3, the lower-layer roadbed material 4, the upper-layer roadbed material 5, the base layer 11, and the surface layer 12 on the roadbed 2 in order. Hereinafter, these components of the road pavement 1 will be described in order.
[Roadbed 2, filter layer 3]
A filter layer 3 is provided on the road bed 2. The filter layer 3 in the present embodiment is intended to prevent intrusion into the roadbed layer on the road bed softened by the infiltrated rainwater and temporarily store rainwater. In the present embodiment, the filter layer 3 is composed of granulated blast furnace slag. The

Since the road bed 2 and the filter layer 3 are well known as this type, further description regarding the road bed 2 and the filter layer 3 is omitted.
[Lower layer roadbed material 4, Upper layer roadbed material 5]
A lower layer roadbed material 4 is provided on the filter layer 3, and an upper layer roadbed material 5 is provided on the lower layer roadbed material 4. In the present embodiment, the thickness of the lower layer roadbed material 4 is about 20 cm and the thickness of the upper layer roadbed material 5 is about 15 cm. However, the thickness is not limited to this, and the roadway permeable pavement 1 What is necessary is just to set suitably according to a specification.

  As shown in the enlarged view in FIG. 1, the lower layer roadbed material 4 is a blast furnace granulated steelmaking slag 7 a having a particle size of 5 mm or more and 40 mm or less and a particle size of 50 mm or more and 90 mass% or less and a particle size of 10 mm or less. The slag 8 is composed of a water-permeable roadbed material 6-1 according to the present invention containing 50% by mass or less and 10% by mass or more and the carbonaceous material 9 by 1% by mass or more and 10% by mass or less.

Further, the upper-layer roadbed material 5 includes 50 to 90% by mass of the blast furnace slow-cooled slag 7b having a particle size of 5 to 40 mm and 50 to 50% by mass of the granulated blast furnace slag 8 having a particle size of 10 mm or less. It is comprised with the water-permeable roadbed material 6-2 containing 10 mass% or more.

Hereinafter, the reason for determining the composition of the water-permeable roadbed materials 6-1 and 6-2 according to the present invention as described above will be described.
The particle size of the roadbed material is generally designed so that the maximum size is 40 mm as described in the document “Paving Construction Handbook” (Japan Road Association). Moreover, the permeability of rainwater increases as the minimum particle size increases. If the minimum particle size is less than 5 mm, both the permeability and supporting force of rainwater are insufficient. Therefore, the particle diameters of the steelmaking slag 7a contained in the permeable roadbed material 6-1 and the blast furnace slow-cooled slag 7b contained in the permeable roadbed material 6-2 are limited to 5 mm or more and 40 mm or less.

  In addition, since the granulated blast furnace slag 8 has a porous shape, it can enhance rainwater permeability and can also increase the supporting force because it has hydraulic properties. However, if the maximum particle size is more than 10 mm, the supporting force is reduced. Therefore, the particle size of the granulated blast furnace slag 8 contained in any of the water-permeable roadbed materials 6-1 and 6-2 is limited to 10 mm or less. From this point of view, it is not necessary to provide a lower limit value for the particle size of the blast furnace granulated slag 8, but it is desirable to set it to 0.5 mm or more from the viewpoint of maintaining water permeability.

  Moreover, this inventor performed the water permeability test and the correction | amendment CBR test about the water-permeable roadbed material using the latent hydraulic property which steel slag has. FIG. 2 shows the results of the water permeability test in a graph, and FIG. 3 shows the results of the modified CBR test in a graph.

  As shown in FIG. 2, the water permeability test includes blast furnace slag 7b having a particle size of 5 mm to 30 mm and a blast furnace water having a particle size of 5 mm or less. 6 types of crushed slag 8 containing 50 mass% or less and 0 mass% or more (reference numerals 1 to 6 in FIG. 2), and steelmaking slag 7a having a particle size of 5 mm or more and 30 mm or less is contained in an amount of 50 mass% or more and 100 mass% or less. The blast furnace granulated slag 8 having a particle size of 5 mm or less was used for 6 types (reference numerals 7 to 12 in FIG. 2) containing 50 mass% or less and 0 mass% or more.

  In addition, as shown in FIG. 3, the modified CBR test contains 40 mass% or more and 90 mass% or less of blast furnace slow-cooled slag 7b having a particle diameter of 5 mm or more and 30 mm or less, and the particle diameter is 5 mm or less. 6 types of blast furnace granulated slag 8 containing 60% by mass or less and 10% by mass or more (reference numerals 13 to 18 in FIG. 3) and 40 to 90% by mass of steelmaking slag 7a having a particle size of 5 mm to 30 mm. At the same time, it was carried out for 6 types (reference numerals 19 to 24 in FIG. 3) containing 60 to 10% by mass of granulated blast furnace slag 8 having a particle size of 5 mm or less.

  As shown in the graph of FIG. 2, the blast furnace slag 50 to 90% by mass having a particle size of 5 to 30 mm and the granulated blast furnace slag 50 to 10% by mass having a particle size of 5 mm or less 5 Containing seeds (reference numerals 1 to 5 in the figure), steelmaking slag having a particle size of 5 to 30 mm, 50 to 90% by mass, and granulated blast furnace slag having a particle size of 5 mm or less 5 to 10% by mass 5 The seeds (reference numerals 7 to 11 in the figure) indicate that the water permeability coefficient exceeds the upper layer roadbed material target value or the lower layer roadbed material target value, and can be used as a water permeable roadbed material.

Specifically, by containing 50 mass% or more and 80 mass% or less of blast furnace slow-cooled slag 7b or steelmaking slag 7a and containing blast furnace granulated slag 8 by 50 mass% or less and 20 mass% or more, the hydraulic conductivity is an upper layer roadbed. The material target value of 1 × 10 ⁻³ (cm / s) is satisfied. Moreover, by containing 50 mass% or more and 90 mass% or less of blast furnace slow-cooling slag 7b or steelmaking slag 7a, and containing blast furnace granulated slag 8 50 mass% or less and 10 mass% or more, a hydraulic conductivity is a target value of lower layer roadbed material. 1 × 10 ⁻⁴ (cm / s) is satisfied. Further, when 100% of the blast furnace slow-cooled slag 7b or the steelmaking slag 7a was contained, the water permeability became 1 × 10 ⁻⁵ (cm / s) or less, and the road base material target value could not be satisfied.

  On the other hand, as shown in the graph of FIG. 3, blast furnace granulated slag 8 containing 50 mass% or more and 90 mass% or less of blast furnace slow-cooled slag 7b having a particle diameter of 5 mm or more and 30 mm or less and having a particle diameter of 5 mm or less. 50% by mass or less containing 10% by mass or more (symbols 14 to 18 in the figure) and steelmaking slag 7a having a particle size of 5 mm or more and 30 mm or less and 50% by mass or more and 90% by mass or less and a particle size. Five types of blast furnace granulated slag 8 that is 5 mm or less and 50 mass% or less and 10 mass% or more (reference numerals 20 to 24 in the figure) are corrected CBR values of upper roadbed material JIS standard value or lower roadbed material JIS standard It exceeds the value, and it can be seen that it can be used as a permeable roadbed material.

  Specifically, by containing 60% by mass or more and 90% by mass or less of blast furnace slow-cooled slag 7b or steelmaking slag 7a, and containing blast furnace granulated slag 8 by 40% by mass or less and 10% by mass or more, the corrected CBR value is Satisfies 80% of the JIS standard value for upper roadbed materials. Further, by containing 50 mass% or more and 90 mass% or less of blast furnace slow-cooled slag 7b or steelmaking slag 7a, and containing blast furnace granulated slag 8 of 50 mass% or less and 10 mass% or more, the corrected CBR value is lower layer roadbed material Satisfies the JIS standard value of 30%. Furthermore, the modified CBR value of 40% of the blast furnace slow-cooled slag 7b or steelmaking slag 7a and 60% of the granulated blast furnace slag could not satisfy the JIS standard value of 30%, which is the lower layer roadbed material.

  From the above results, the content of the blast furnace slow-cooled slag 7b or the steelmaking slag 7a is limited to 50% by mass or more and 90% by mass or less as the range to be blended with the permeable roadbed materials 6-1 and 6-2. The content of slag 8 is 50% by mass or less and 10% by mass or more.

  Furthermore, the water-permeable roadbed material 6-1 which comprises the lower layer roadbed material 4 contains 1 mass% or more and 10 mass% or less of carbonaceous substances 9, such as activated carbon, for example. Thereby, purification of water quality can also be achieved. This is because if the content of the carbonaceous material 9 is less than 1 mass, this effect does not appear clearly, while if the content exceeds 10 mass%, the cost increases. Examples of the carbonaceous material 9 include paper carbide, rubber carbide, and vinyl chloride carbide in addition to activated carbon.

In addition, the water-permeable roadbed materials 6-1 and 6-2 according to the present invention may further contain 1 to 5% by mass of a latent hydraulic substance or a pozzolanic reactive substance as an additive.
The term “latent hydraulic substance” means a substance that has the property of reacting with water in the presence of a suitable stimulant to form a hydrate with low solubility and curing, such as hard-baked gypsum, blast furnace cement, Examples thereof include sulfate slag cement, lime slag cement, keens cement and the like.

  The term “pozzolana-reactive substance” means a substance that has the property of reacting with lime in the presence of water to harden. For example, natural products include various types of volcanic ash, white clay silicates, and volcanic rocks. Examples include weathered materials, diatomaceous earth, and the like, and examples of the artificial materials include calcined viscosity and fly ash that is industrial waste.

  The roadbed material needs to increase the supporting force due to the vehicle load, and as a means for that purpose, a hydraulic material is added as an additive, specifically, the above-described latent hydraulic substance or pozzolanic reactive substance. By adding as an additive, the supporting force can be increased.

  FIG. 4 shows that the granulated blast furnace slag 7b having a particle size of 5 mm to 30 mm is contained in an amount of 50 mass% to 85 mass%, and the granulated blast furnace slag 8 having a particle diameter of 5 mm or less is 49 mass% to 10 mass. It is a graph which shows the correction | amendment CBR value of what added 1 mass% or more and 5 mass% or less of the latent hydraulic substance or the pozzolanic reactive substance to 8 types (code | symbol 25-32 in a figure) which contain% or more.

As shown in the graph of FIG. 4, the corrected CBR value increased because all of the samples 25 to 32 contained the additive 10.
FIG. 5 is a cross-sectional view showing a lower layer roadbed material 4 constituted by a water-permeable roadbed material 6-1 to which an additive 10 of a latent hydraulic substance or a pozzolanic reactive substance is added. As shown in the figure, the additive 10 is present inside the permeable roadbed material 6-1 so as to cover the periphery of the steelmaking slag 7a, so it is considered that the corrected CBR value can be increased.

  When the amount of the latent hydraulic substance or pozzolanic reactive substance added as the additive 10 is less than 1%, such an effect cannot be expected. On the other hand, the properties of these substances are powdery and have a water permeability coefficient. The upper limit of the amount of addition is set to 10% or less because the cost is increased due to the decrease in cost and the cost of these substances themselves. For this reason, it is desirable that the addition amount of the latent hydraulic substance or the pozzolanic reactive substance is 1% or more and 10% or less.

  Thus, the water-permeable roadbed materials 6-1 and 6-2 in the present embodiment are separated from the particles of the blast furnace slow-cooled slag 7b or the steelmaking slag 7a that are at least partially separated. Blast furnace granulated slag 8 particles existing between the particles. For this reason, while the blast furnace slow cooling slag 7b or the steelmaking slag 7a particles can exert the supporting force required as the roadbed material, the rainwater in which the particles of the blast furnace granulated slag 8 are mainly required as the roadbed material. The water permeability can be exhibited. Thereby, the water-permeable roadbed material 6-1 and 6-2 in this Embodiment can exhibit both the support force requested | required as a roadbed material, and the water permeability of rainwater.

The water-permeable roadbed materials 6-1 and 6-2 of the present embodiment are configured as described above. Next, the manufacturing method of this water-permeable roadbed material 6-1 and 6-2 is demonstrated.
6 and 7 are explanatory views schematically showing the manufacturing steps 13 and 14 of the water-permeable roadbed materials 6-1 and 6-2 of the present embodiment. FIG. 6 shows a case where a mixer 17 which is a mixing facility is used, and FIG. 7 shows a case where a crusher 18 which is a crushing and sizing facility is used.

  6 and 7, the blast furnace slow-cooled slag 7b or steelmaking slag 7a having a particle size of 5 mm to 40 mm and 50 mass% to 90 mass%, and the blast furnace granulated slag 8 having a particle size of 10 mm or less to 50 mass. % Or less and 10% by mass or more are cut out by the raw material receiving hopper 15 and supplied to the mixer 17 or the crusher 18 via the conveyor 16. Then, the blast furnace slow-cooled slag 7b or steelmaking slag 7a and the blast furnace granulated slag 8 are mixed by the mixer 17 or the crusher 18 and mounted on the belt conveyor 19 disposed below the mixer 17 or the crusher 18 for conveyance. .

  And the activated carbon which is the carbonaceous material 9 is cut out for the lower-layer roadbed material 4 from the silo 20 arrange | positioned above the belt conveyor 19, and by adding to the mixture mounted in the belt conveyor 19, water-permeable roadbed material 6- 1 and 6-2 are manufactured and accommodated in the product bottle 21 via the belt conveyor 19.

  As described above, the permeable roadbed materials 6-1 and 6-2 of the present embodiment are manufactured at a low cost only by adding the silo 20 to the process in which the existing mixer 17 or the crusher 18 is provided. can do.

The lower layer roadbed material 4 is constructed by the water-permeable roadbed material 6-1 manufactured in this manner, and the upper layer roadbed material 5 is constructed by the water-permeable roadbed material 6-2.
[Base layer 11, surface layer 12]
In FIG. 1, a base layer 11 is provided on the upper layer roadbed material 5, and a surface layer 12 is provided on the base layer 11. Both the surface layer 11 and the base layer 12 were constructed by asphalt water-permeable pavement. In the present embodiment, the thicknesses of the surface layer 11 and the base layer 12 are both about 5 cm, but are not limited to this thickness, and may be set as appropriate according to the specifications of the water-permeable pavement 1 for a roadway.

Since the surface layer 11 and the base layer 12 are well-known and commonly used in this type, further explanation regarding the surface layer 11 and the base layer 12 is omitted.
The water-permeable permeable pavement 1 of this Embodiment is comprised as mentioned above.

  Since this road-permeable permeable pavement 1 uses the carbonaceous material 9 for the lower roadbed material 4, compared with the invention disclosed by Patent Document 1 in which carbide is provided in the filter layer, the work of replacing the carbide whose purification effect has disappeared is performed. It is easy and can be done at low cost.

  Moreover, since this water-permeable permeable pavement 1 does not require the operation | work which knead | mixes a cement paste with steel slag, unlike the invention described in patent document 2, hardening of material advances rapidly from immediately after kneading | mixing. No, temporary placement before construction can be performed. For this reason, sufficient time from kneading to construction can be secured, and process management during construction is simple.

  Moreover, since this permeable pavement 1 for roadways is comprised by making the blast furnace slow cooling slag 7b or the steelmaking slag 7a, and the blast furnace granulated slag 8 into a main component, it can obtain the stable latent hydraulic property. Therefore, it is suitable for water-permeable pavement for roadways. In addition, since the obtained supporting force is stable, a desired holding force can be easily obtained by adding various additives.

  Specifically, this road-permeable permeable pavement 1 adds a cement-based hydraulic substance or a pozzolanic reactive substance such as fly ash so that it can be used for the road according to the number of vehicles passing through, the weight, etc. The supporting force required as a roadbed material can be reliably ensured. By adding the carbonaceous material 9 such as activated carbon, the permeated water from the rainwater can be purified.

  Thus, since the water-permeable pavement 1 for roadways of this Embodiment uses the water-permeable roadbed material 6-1 and 6-2 using the steel slag material which has latent hydraulic property, its quality stability and manufacture Therefore, the roadway water-permeable pavement 1 can be constructed with excellent workability.

Further, the present invention will be specifically described with reference to examples.
The water-permeable permeable pavement 1 shown in FIG. 1 was constructed. At this time, in the upper roadbed material 5, 70 mass% of blast furnace slow-cooled slag was blended and 30 mass% of blast furnace granulated slag was blended. Further, in the lower layer roadbed material 4, 50% by mass of steelmaking slag was blended, 48% of blast furnace granulated slag was blended, and 2% of activated carbon was further blended.

As shown in the graphs of FIGS. 2 to 4 described above, the hydraulic conductivity of the upper roadbed material 5 of this embodiment is about 1 × 10 ⁻² (cm / s), and the corrected CBR value is about 150%. Moreover, the uniaxial compressive strength was 1.7 (N / mm < ² >).

Moreover, the hydraulic conductivity of the lower layer roadbed material 5 of the present embodiment is about 0.5 × 10 ⁻¹ (cm / s), and the corrected CBR value is about 120%. The uniaxial compressive strength was 1.3 (N / mm ² ).
And about this water-permeable pavement 1 for roadways, the confirmation test of the water permeability at the time of the construction was done. In this confirmation test, an observation hole 22 was provided in the vicinity of the road bed 2, and the outflow of rainwater was confirmed from this observation hole 22. As a result, it was possible to confirm the outflow of rainwater at the observation hole 22 during the rain, and there was no problem for 24 months thereafter.

It is sectional drawing which shows the structure of the water-permeable road pavement using the water-permeable roadbed material of embodiment. It is a graph which shows the result of a water permeability test collectively. It is a graph which shows the result of a correction CBR test collectively. Containing 50 mass% or more and 85 mass% or less of blast furnace slow-cooled slag having a particle size of 5 mm or more and 30 mm or less, and 49 mass% or less of 10 mass% or more of granulated blast furnace slag having a particle diameter of 5 mm or less 8 It is a graph which shows the correction | amendment CBR value of what added 1 mass% or more and 5 mass% or less of the additive to the seed | species (code | symbol 25-32 in a figure). It is sectional drawing which shows the lower layer roadbed material comprised with the water-permeable roadbed material which added the additive. It is explanatory drawing which shows typically the manufacturing process of the water-permeable roadbed material of embodiment, and shows the case where the mixer which is mixing equipment is used. It is explanatory drawing which shows typically the manufacturing process of the water-permeable roadbed material of embodiment, and shows the case where the crusher which is a crushing and sizing equipment is used.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Water-permeable pavement 2 Road bed 3 Filter layer 4 Lower layer roadbed material 5 Upper layer roadbed material 7a Steelmaking slag 7b Blast furnace gradual cooling slag 8 Blast furnace granulated slag 11 Base layer 12 Surface layer

Claims (4)

Blast furnace slow-cooled slag or steelmaking slag having a particle size of 5 to 40 mm, 50 to 90% by mass, granulated blast furnace slag having a particle size of 10 mm or less, and 10 to 10% by mass of carbonaceous matter. A permeable roadbed material characterized by containing.   Furthermore, 1-5 mass% of latent hydraulic substances or pozzolanic reactive substances are contained, The water-permeable roadbed material described in Claim 1 characterized by the above-mentioned. Supply blast furnace slow-cooled slag or steelmaking slag 50 to 90% by mass with a particle size of 5 to 40 mm and blast furnace granulated slag 50 to 10% by mass with a particle size of 10 mm or less to crushing and sizing equipment or mixing equipment After mixing, the mixture is transported by being mounted on a conveyor belt disposed under the crushing and sizing facility or the mixing facility, and extracted from a silo disposed above the conveyor belt. A method for producing a water-permeable roadbed material, comprising adding at least a carbonaceous material of a pozzolanic reactive substance or a carbonaceous material to the mixture. In order from the lower layer, a filter layer, 50 to 90% by mass of blast furnace chilled slag or steelmaking slag having a particle size of 5 to 40 mm, 50 to 10% by mass of granulated blast furnace slag having a particle size of 10 mm or less, and 1 carbonaceous material. A water-permeable equipment comprising a water-permeable roadbed material, a base layer, and a surface layer containing 10% by mass to 10% by mass .

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