JPH08295802A - Water draining paving material and its production - Google Patents

Abstract

PURPOSE: To produce a water draining paving material capable of constructing a water draining pavement excellent in durability by using thereof in a paving material such as a surface layer and a base layer of the pavement. CONSTITUTION: The surface of a coarse aggregate is coated with a binder to form a binder layer and a filler and a fine aggregate are then uniformly dispersed and applied to the top surface of the binder layer to provide a filter/ fine aggregate layer. A binder layer is then formed so as to cover the top surface of the filler/fine aggregate layer to thereby produce a water draining paving material having a coating layer of a three-layer structure comprising (1) the binder layer, (2) the filler/fine aggregate layer and (3) the binder layer on the surface of the coarse aggregate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drainage pavement material and a method for producing the same. More specifically, drainage pavement materials that can be used as pavement materials for surface layers and base layers of general roads, highways, factory roads, airports or park plazas, etc. The present invention relates to a manufacturing method thereof.

[0002]

2. Description of the Related Art In recent years, drainage pavements have been rapidly spreading because they have excellent functions in road safety measures such as traffic safety measures and traffic noise reduction. The pavement material for constructing this drainage pavement has a very large proportion of coarse aggregate as compared with general pavement material, in order to provide the pavement with the function of quickly allowing rainwater to permeate. The porosity is about 15 to 35%, which is considerably large. Therefore, the conventional drainage pavement has almost no strength due to the meshing effect of the aggregate, so that the aggregate easily scatters during service, and the large porosity causes rainwater to flow directly to the inside of the pavement as well as the pavement surface. It has a drawback that it is easily deteriorated under the influence of ultraviolet rays and the durability is extremely inferior to that of general pavement.

Therefore, as a method for compensating for these drawbacks,
The use of high viscosity modified asphalt as a binder for drainage pavement has become commonplace. This method, by increasing the amount of the binder used, to strengthen the adhesive force between the aggregates to prevent scattering of the aggregates, and
The purpose of the present invention is to obtain a drainage pavement material in which the thickness of the binder to the aggregate is increased to make it less susceptible to rainwater and ultraviolet rays. Further, the use of high-viscosity modified asphalt causes the occurrence of lumps of sag in the drainage pavement material (those with lumps of asphalt mortar), so-called sagging, even when a large amount of binder is used. Instead, it aims to maintain a thick film thickness for the aggregate.

[0004]

However, in this conventional drainage pavement material, heated coarse aggregate and fine aggregate are simultaneously charged into a mixer, and a filler and a heat-melted binder are added thereto. It was manufactured by the same manufacturing method as a general pavement material manufacturing method in which the materials are charged and mixed together for about 40 to 80 seconds. For this reason, even if an apparently thick coating layer is formed on the surface of the coarse aggregate, the interface between the coarse aggregate and the coating layer is in a state where the filler, the fine aggregate and the binder are mixed. Therefore, the adhesion of the coating layer to the coarse aggregate was weak, and sagging that occurred during work (during the operation of the pavement material) was unavoidable. As a result, the amount of binder used was limited, and satisfactory performance as a drainage pavement material could not be achieved.

On the other hand, as a method for increasing the amount of the binder used, a method in which modified fiber or straight asphalt is used in combination with vegetable fiber or slaked lime is also practiced, and in some cases, some effect is achieved. However, this method is not yet satisfactory, and further improvement is required.

In any case, the conventional drainage pavement material and its manufacturing method still have a problem in terms of durability of the pavement.

The present invention solves these conventional problems,
An object of the present invention is to provide a drainage pavement material which can be used as a pavement material such as a surface layer and a base layer of the pavement to construct a drainage pavement material having excellent durability, and a manufacturing method thereof.

[0008]

Means for Solving the Problems The present inventor has conducted various studies as to the drainage pavement material, and as a result, the performance of the drainage pavement material is mainly related to the mode of the adhesive layer for bonding the aggregates. I found out that That is, it was found that the performance depends on whether or not the thick coating layer having a layered structure is firmly attached to the surface of the coarse aggregate which is the main material. Further, it was found that the mode thereof changes variously due to the difference in the manufacturing method of the drainage pavement material.

The present inventors have completed the present invention based on such findings.

That is, according to the present invention, the surface of the coarse aggregate is coated with a binder to form a binder layer, and the filler and the fine aggregate are uniformly dispersed and adhered on the upper surface of the binder layer to form the filler / fine aggregate. By providing the aggregate layer and the binder so as to cover the upper surface of the filler / fine aggregate layer, the surface of the coarse aggregate is composed of the binder layer, the filler / fine aggregate layer and the binder layer. The present invention provides a drainage pavement material having excellent durability as a drainage pavement, which is provided with a coating layer having a three-layer structure, and a method for producing the same.

According to the drainage pavement material of the present invention, since the surface of the coarse aggregate is firmly adhered and coated by the thick coating layer having the three-layer structure, the aggregate has excellent resistance to scattering of aggregate and is excellent in durability. That is,
The first layer of the three-layer structure has good leakage at the rough aggregate interface and has a function of strengthening the adhesive force of the filler and the fine aggregate to the coarse aggregate, and the third layer of the bond Since the material layer has a function of strengthening the adhesive force between the aggregates and the gripping force, the drainage pavement material has no sagging at the time of operation and does not scatter the aggregate during use.

The present invention will be described in detail below.

The coarse aggregate used in the present invention is one that passes the quality standard of the aggregate described in "Asphalt Pavement Guidelines" issued by the Japan Road Association, 4.75 m.
It is a single-grain aggregate that stays on a m, 13.2 mm or 19.0 mm sieve. Typical examples include crushed stone,
Examples include crushed stone, gravel, and single-grain steelmaking slag. In addition, natural or artificial hard aggregates, light-colored aggregates, colored aggregates, and the like can be used as long as they meet the quality standards.
These coarse aggregates may be used alone or in combination of two or more kinds.

The fine aggregate used in the present invention is the one that passes the quality standard of the aggregate described in "Asphalt Pavement Guidelines" like the above-mentioned bare aggregate, and passes through a 2.36 mm sieve. It is an aggregate that stops on a 0.075 mm sieve. Typical examples include river sand, mountain sand, sea sand, artificial sand, and screenings. In addition, special sand such as silica sand, granulated blast furnace slag, and clinker ash can also be used as long as they pass the quality standard.
These fine aggregates may be used alone or in combination of two or more kinds.

The amount of fine aggregate used is preferably 0 to 30 parts by weight per 100 parts by weight of coarse aggregate. When the amount of fine aggregate used exceeds 30 parts by weight, it is not possible to secure sufficient porosity for promptly allowing rainwater or the like to permeate the pavement.

The filler used in the present invention is stone powder, slaked lime, cement, recovered dust, fly ash, etc., and those which meet the quality standards described in the above "Asphalt Pavement Guideline" are used. Others, plant fiber (MC),
A fibrous filler, a filler, etc. can be used. Examples of the filler include glass powder, iron powder, metal powder, inorganic or organic pigments and the like. These fillers may be used alone or in combination of two or more.

The amount of the filler used is preferably in the range of 0 to 10 parts by weight with respect to 100 parts by weight of the coarse aggregate. When the amount of the filler used exceeds 10 parts by weight, the viscosity of the binder becomes too high and the workability deteriorates, making it difficult to form a thick coating layer having a three-layer structure.

The binder used in the present invention is a modified asphalt obtained by mixing asphalt with rubber and a thermoplastic polymer to modify the asphalt.

As the asphalt used in the modified asphalt, petroleum asphalt such as natural asphalt, straight asphalt, blown asphalt, semi-blown asphalt, solvent deasphalting asphalt (for example, propane deasphalting asphalt) is used. These asphalts may be used alone or in combination of two or more.

The rubber and the thermoplastic polymer used in the modified asphalt are, for example, natural rubber, catavac, cyclized rubber, styrene-butadiene rubber, styrene-
Isoprene rubber, isoprene rubber, polyisoprene rubber, butadiene rubber, chloroprene rubber, butyl rubber,
Halogenated butyl rubber, chlorinated polyethylene, chlorosulfonated polyethylene, ethylene propylene rubber, EP
Rubber such as T rubber, alfin rubber, styrene / butadiene block polymer rubber, styrene / isoprene block polymer rubber, ethylene / vinyl acetate copolymer, ethylene / ethyl acrylate copolymer, polyethylene,
It is a thermoplastic polymer such as vinyl acetate / acrylate copolymer. These 1 type (s) or 2 or more types are used.

Along with the above-mentioned rubber and thermoplastic polymer, a thermoplastic solid resin or solid rubber as a tackifier,
Liquid resins, softening agents and the like can be added and used. For example, rosin and its derivative, terpene resin and petroleum resin and its derivative, alkyd resin, alkylphenol resin, terpene phenol resin, coumarone indene resin,
Examples thereof include synthetic terpene resins, alkylene resins, polyisobutylene, polybutadiene, polypten, isobutylene and butadiene copolymers, mineral oils, process oils, pine oils, anthracene oils, pine oils, plasticizers, animal and vegetable oils, and polymerized oils. Further, an antioxidant, an antioxidant, sulfur and the like can be added and used.

The compounding ratio of the asphalt of the modified asphalt, the rubber and the thermoplastic polymer is usually preferably 5 to 100 parts by weight based on 100 parts by weight of the asphalt. If the amount of rubber or thermoplastic polymer is less than 5 polymer, the performance as modified asphalt cannot be exhibited, and the adhesive force and gripping force between aggregates are not much different from ordinary asphalt. On the other hand, when it exceeds 100 parts by weight, the cohesive force is too strong and the workability is poor, and on the contrary, peeling occurs from the aggregate and the aggregate tends to scatter.
Further, as the above-mentioned asphalt, it is preferable to use one having a penetration (25 ° C.) of about 40 to 120 in consideration of characteristics after use.

In the present invention, 60 of modified asphalt is used.
The viscosity of 200,000 poise or more is set in consideration of the flow resistance of drainage pavement and the suppression of crushing of drainage pavement. That is, the drainage pavement has a problem in durability because aggregate is easily scattered during use and is easily affected by rainwater, ultraviolet rays, etc., and is also used for general roads and highways. Therefore, fluid breakage is likely to occur, which is also a cause of poor durability.

Further, the drainage pavement has a problem that it is difficult to maintain a satisfactory water permeation function because it tends to be crushed by traffic load.

Therefore, when the drainage pavement material is used on a road having a high traffic volume, a material having a high dynamic stability (DS) is required. Generally, the dynamic stability (DS) has a strong correlation with the 60 ° C. viscosity of the binder, and the higher the viscosity, the higher the dynamic stability (DS) tends to be. Therefore, the set value is determined based on past experience and achievements. The 60 ° C viscosity of semi-prone asphalt (AC-100), which is used with particular emphasis on flow control, is about 10,000 poise, and the 60 ° C viscosity of ordinary straight asphalt is about 2000 poise. is there.

The amount of the binder used is usually in the range of 2 to 10 parts by weight with respect to 100 parts by weight of the coarse aggregate. If the amount of the binder used is less than 2 parts by weight, it becomes difficult to form a coating layer having a three-layer structure that covers the surface of the coarse aggregate, and the adhesive force between the aggregates becomes small, which causes scattering of the aggregate. On the other hand,
If the amount of the binder used exceeds 10 parts by weight, the amount of the binder may be unnecessarily increased and the sagging may occur during the work. In addition, the first usage amount of the binder is usually preferably in the range of 1 to 5 parts by weight with respect to 100 parts by weight of the coarse aggregate. When the amount of the binder used is less than 1 part by weight, it is not possible to form a coating layer on the surface of the coarse aggregate to disperse and adhere the filler and the fine aggregate uniformly.
When the amount of the binder used exceeds 5 parts by weight, the second amount of the binder used is insufficient and it becomes difficult to form a coating layer having a three-layer structure. The second usage amount of the binder is usually preferably in the range of 1 to 5 parts by weight with respect to 100 parts by weight of the coarse aggregate. 3 if the amount of binder used is less than 1 part by weight
While it is difficult to form a coating layer having a layered structure, when the amount of the binder used exceeds 5 parts by weight, it means that the amount of the first binder used was small and the coarse aggregate is used. Since the filler and the fine aggregate cannot be uniformly dispersed and adhered to the surface, it becomes difficult to form a coating layer having a three-layer structure in the same manner.

Next, a method for preparing the drainage pavement material of the present invention will be described.

The drainage pavement material of the present invention is usually prepared by the following steps I to V in a hot asphalt plant for pavement.

I. First, a required amount of coarse aggregate heated to a predetermined temperature is charged into the mixer. II. Then, a part of the required amount of the binder that is heated and melted to a predetermined temperature is added and mixed, and the surface of the coarse aggregate is covered with the binder to form a binder layer on the surface of the coarse aggregate. III. Next, a required amount of filler heated to a predetermined temperature is added to and mixed with this, and uniformly dispersed and adhered to the binder layer on the surface of the coarse aggregate. IV. Furthermore, the required amount of fine aggregate heated to a predetermined temperature is added to and mixed with this, and the fine aggregate is evenly dispersed and adhered to the binder layer on the surface of the coarse aggregate to form the filler / fine aggregate layer. Form. The steps of III and IV may be reversed in order or may be added at the same time. V. Finally, again, by adding and mixing the remaining portion of the required amount of binder, which is heated and melted at a predetermined temperature, from the binder layer, the filler / fine aggregate layer and the binder layer to the surface of the coarse aggregate. A thick coating layer having a three-layer structure is formed.

Thus, the drainage pavement material of the present invention is obtained. That is, the surface of the coarse aggregate is coated with a binder to provide a binder layer, and the filler and the fine aggregate are uniformly dispersed and adhered to the upper surface of the binder layer to provide the filler / fine aggregate layer, By providing the binder layer so as to cover the upper surface of the filler / fine aggregate layer, the coarse aggregate has a binder layer, a filler / fine aggregate layer, and a binder layer on the surface 3
A drainage pavement material having a layered coating layer is obtained.

The drainage pavement material thus obtained is
Since the thick coating layer with a three-layer structure is firmly attached and coated on the surface of the coarse aggregate, a) there is no sagging even when the amount of the binder used is large, and the adhesive force between the aggregates and the grasping force are strong. There is no scattering of material,
b) In addition, it is not easily affected by rainwater and ultraviolet rays. c) Furthermore, because it uses a high-viscosity binder, it has excellent performance such as high flow resistance and durability. It is very good.

The drainage pavement material of the present invention is laid on the surface layer or the base layer of the roadway according to the construction procedure described in the above "Asphalt Pavement Guideline". However, in the paving work in this case, the number of times of rolling and the temperature at the time of rolling are different depending on the type and amount of binder used in both initial rolling and finishing rolling. It is preferable to confirm it. Also, the paving machines used,
Since there is no particular difference from the case of general pavement material, it will not be described in detail.

[0033]

EXAMPLES AND COMPARATIVE EXAMPLES Examples and comparative examples will be shown below to further describe the features of the present invention.

[0034]

[Materials used]

1. Coarse aggregate No. 6 crushed stone (Kanuma City, Tochigi Prefecture) This No. 6 crushed stone has a specific gravity of 2.871 and a particle size of 4.75.
Is about 13.2 mm. 2. Fine aggregate Fine sand (produced in Sahara City, Chiba Prefecture) This fine sand has a specific gravity of 2.764 and a particle size of 0.075.
Is about 2.36 mm. 3. Filler Stone powder (commercially available product) This stone powder has a specific gravity of 2.710 and particle size of 0.075 m.
m or less. 4. Binder Material Modified asphalt (Toughphalt Super; manufactured by Nichireki Co., Ltd.) Typical properties of this modified asphalt are shown in Table 1.

[0035]

[Table 1]

[0036]

[Experiment 1] In a test room, drainage pavement materials according to the production method of the present invention were produced at the compounding ratios shown in Table 2, and as a test regarding durability, a drainage pavement material sagging test was performed.

The sag test is effective in determining the upper limit of the amount of binder used. That is, the amount of the binder used is closely related to the durability of the drainage pavement material, and it is preferable that the amount used is as large as possible.

I. Manufacture of Drainage Pavement Materials Drainage pavement materials were manufactured by the following procedure (hand kneading) and immediately subjected to a sag test. First, 830 g of No. 6 crushed stone is put into a mixing pan and heated to about 165 ° C., then about 180 ° C.
26.3 g of the modified asphalt that had been heated and melted was added to and mixed for about 60 seconds. Subsequently, 50 g of stone powder heated to about 165 ° C. was added and mixed for about 40 seconds, and then 120 g of fine sand heated to about 165 ° C. was added and mixed for about 40 seconds. Finally, the drainage pavement material A was manufactured by adding again 26.3 g of the modified asphalt heated to about 180 ° C. and mixing for about 60 seconds. Less than,
Similarly, the addition amount of the modified asphalt was divided into two equal amounts, and drainage pavement materials B, C, D and E were manufactured in the same manner.

II. Sagging test 1) Place the filter paper and aluminum wheel on the lower part of the Marshall mold prepared in advance, and immediately fill the mold with the required amount of drainage paving material manufactured in the previous section. 2) The drainage pavement material packed in the mold is cured for 1 hour in a constant temperature bath set at 165 ° C. 3) After curing, measure the weight of the binding material that has dripped onto the filter paper and aluminum wheel in the lower part of the pan to calculate the amount of droop. The test results are shown in FIG.

For comparison, a drainage green pavement material having the same composition ratio as shown in Table 2 was manufactured by a conventional manufacturing method and a sag test was conducted. The test results are also shown in FIG.

[0041]

[Table 2]

From FIG. 1, when comparing the same amount of binder, the amount of sag of the drainage pavement material produced by the production method of the present invention is smaller than that produced by the conventional production method. It can be seen that there is a difference due to the manufacturing method.

Unlike the general method for determining the optimum amount of binder for pavement material, the optimum amount of binder for drainage pavement material is determined mainly by considering the durability of the pavement. That is, the optimum amount of binder is the amount of binder that can be retained by the drainage pavement material to the maximum, and the amount of binder that can ensure functionality (water permeability, etc.).

On the other hand, regarding the relationship between the hydraulic conductivity and the amount of sag in the drainage pavement material, past experimental data, for example,
Magazine "Pavement" issued by Construction Books Co., Ltd. (1992, 8 V
oL27) From the description on page 10, the water permeability of drainage pavement tends to decrease as the amount of sag increases,
Further, it is known that when the amount of sagging exceeds about 500 mg, the water permeation performance sharply decreases. Therefore, the sagging amount of the drainage pavement material is one standard (upper limit) of 500 mg.

When the optimum amount of binder is calculated from this result,
The optimum amount of binder in the drainage pavement material produced by the production method of the present invention is 5.3 wt%, and the optimum amount of binder material in the drainage pavement material produced by the conventional production method is 5.0 wt%.

[0046]

[Experiment 2] Similar to Experiment 1, in the test room, the drainage pavement material according to the production method of the present invention was manufactured at the compounding ratio shown in Table 2, and as a test on durability, the test method "JHS 231" of the Japan Highway Public Corporation The cantapro test was conducted in accordance with the above. The Kantapro test is effective in discriminating aggregate scattering resistance. The test results are shown in FIG.

For comparison, a drainage pavement material having the mixing ratio shown in Table 2 was manufactured by a conventional manufacturing method, and a cantapro test was conducted. The test results are also shown in FIG.

From FIG. 2, when compared with the same amount of binder, the kantapro loss rate of the drainage pavement material produced by the production method of the present invention is compared with that of the drainage pavement material produced by the conventional production method. You can see that it has become quite small. It is presumed that this is because the drainage pavement material produced by the manufacturing method of the present invention has a low loss rate because the surface of the coarse aggregate is firmly adhered and covered by the thick coating layer having a layered structure.

In comparison with the optimum amount of binder obtained in Experiment 1, the drainage pavement material produced by the method of the present invention has a Kantapro loss rate of 6.1%, whereas the conventional method produced the same. The KantaPro loss rate of drainage pavement is 13.
It is more than twice as large as 0%.

As described above, there is a clear difference in the cantapro loss rate, which is considered to have the greatest influence on the durability, depending on the manufacturing method.

[0051]

[Experiment 3] The optimum amount of binder (5.3 wt) obtained in Experiment 1
%), A drainage pavement material was manufactured by the manufacturing method of the present invention, and as other tests relating to durability and performance, a Marshall stability test, a wheel tracking test and a water permeability test were conducted. However, the Marshall stability test and the wheel tracking test were performed in accordance with the "Pavement Test Method Handbook" issued by the Japan Road Association, and the water permeation test was performed in accordance with the test method of the Japan Highway Public Corporation. The test results are shown in Table 3.

For comparison, a drainage pavement material was manufactured by the conventional manufacturing method for the optimum amount of binder (5.0 wt%) similarly obtained in Experiment 1, and a Marshall stability test, a wheel tracking test and a water permeability test were conducted. I did. The test results are also shown in Table 3.

[0053]

[Table 3]

From Table 3, the test results show almost no difference between the example and the comparative example. This means that the drainage pavement material produced by the production method of the present invention can sufficiently secure the performance of the drainage pavement material produced by the conventional production method even if a larger amount of the binder is used, and thus the amount of the binder used is larger. Therefore, it can be understood that the durability as a drainage pavement material is excellent.

As described above, the results of Experiment 1, Experiment 2 and Experiment 3 proved that the drainage pavement material according to the manufacturing method of the present invention was useful.

[0056]

Since the present invention is constructed as described above, it has the following excellent effects. (1) According to the method for producing a drainage pavement material of the present invention, drainage in which a thick covering layer having a three-layer structure including a binder layer, a filler / fine aggregate layer and a binder layer is provided on the surface of the coarse aggregate. Has the real benefit of being able to build a hard pavement material. (2) In the drainage pavement material according to the manufacturing method of the present invention, the coating layer that covers the surface of the coarse aggregate (the adhesive layer that bonds the aggregates) is formed of a thick coating layer having a three-layer structure. As a result, it is possible to construct a durable drainage pavement with excellent aggregate resistance to scattering. That is, the first binder layer covering the surface of the coarse aggregate has good leakage at the coarse aggregate interface and has a function of strengthening the adhesive force of the filler and the fine aggregate to the coarse aggregate, and Since the third bonding material layer has a function of strengthening the adhesive force and the gripping force between the aggregates, there is no sagging at the time of operation and there is a practical benefit that the aggregates are not scattered during the service. (3) The drainage pavement material produced by the manufacturing method of the present invention has weather resistance without being affected by rainwater, ultraviolet rays, etc. because the surface of the coarse aggregate is firmly adhered and covered by a thick coating layer having a three-layer structure. It has the practical benefit of being able to build a good drainage pavement. (4) In addition, the drainage pavement material produced by the production method of the present invention can exhibit the same or higher performance as the drainage pavement material of the US, in terms of flow resistance and drainage functionality, even if more binder is used. Have a real benefit.

[0057]

[Brief description of drawings]

FIG. 1 is a graph showing the relationship between the amount of asphalt and the amount of sag.

FIG. 2 is a graph showing the relationship between the amount of asphalt and the Kandapro loss rate.

Front page continuation (72) Inventor Masahiko Saikai 2-18-22 Motomachi, Kiyose-shi, Tokyo (72) Inventor Akikichi Uiri Minami-Kawachi-cho, Kawachi-gun, Tochigi Prefecture 3-1-2 No. 2 (72) Inventor Noriyuki Sakaue 7-19-6 Nishiohisa, Arakawa-ku, Tokyo (72) Inventor Toshiyuki Suzuki 110-2 Koganei, Kokubunji-cho, Shimotsuga-gun, Tochigi Prefecture

Claims (6)

[Claims] 1. A surface of coarse aggregate is coated with a binder to form a binder layer, and a filler and a fine aggregate are uniformly dispersed and adhered to the upper surface of the binder layer to form a filler / fine aggregate layer. A three-layer structure including a binder layer, a filler / fine aggregate layer and a binder layer on the surface of the coarse aggregate by providing the binder layer so as to cover the upper surface of the filler / fine aggregate layer. A drainage pavement material having a coating layer of. 2. The drainage pavement material according to claim 1, wherein the binder is a modified asphalt. 3. The drainage pavement material according to claim 2, wherein the modified asphalt has a viscosity at 60 ° C. of 200,000 poise or more. 4. 100 parts by weight of heated coarse aggregate is added and mixed with 1 to 5 parts by weight of a binder which is heated and melted to coat the surface of the coarse aggregate, and then heated to 0 to 10 parts by weight of filler and 0 to 30 parts by weight of heated fine aggregate is sequentially or simultaneously added and mixed to uniformly disperse and adhere the filler and the fine aggregate to the binder layer on the surface of the coarse aggregate, and then the mixture is heated and melted. By adding and mixing 1 to 5 parts by weight of the material,
A method for producing a drainage pavement material, characterized in that a coating layer having a three-layer structure including a binder layer, a filler / fine aggregate layer, and a binder layer is provided on the surface of the coarse aggregate. 5. The method for producing a drainage paving material according to claim 4, wherein the binder is a modified asphalt. 6. The method for producing a drainage pavement material according to claim 5, wherein the modified asphalt has a viscosity at 60 ° C. of 200,000 poise or more.