JP2016098570A - Asphalt pavement, asphalt pavement surface structure and method for forming asphalt pavement - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an asphalt pavement body and an asphalt pavement road surface structure which can suppress scattering of particulates packed in a gap of a porous layer; and a method for forming the asphalt pavement body.SOLUTION: An asphalt pavement body 12 comprises a porous layer 14 using an asphalt mixture as a base, a group of particulates which is packed in a gap of the porous layer 14 so as to form micropores 17, a group of grains which is packed closer to the side of a surface layer 15 than the group of particulates in the gap of the porous layer 14 so as to form pores 18, a hydrophobic resin 23 which bonds grains 22 constituting the group of grains with each other in the surface layer 15 of the porous layer 14, and a surface active agent 25 which attaches to the inside walls of the pores 18 and which forms a hydrophilic film in the surface layer 15.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an asphalt pavement, an asphalt pavement structure, and a method for forming the asphalt pavement.

  Conventionally, by filling the pores of porous pavement with water permeability with fine particles, water such as rainfall is retained around the fine particles, and the water is vaporized from the road surface by the pumping action by capillary action in fine weather By doing so, there is an asphalt pavement that continuously suppresses the temperature rise on the road surface. In addition, the pavement containing such fine particles is made up of two layers, and the lower layer is filled with the fine particles as it is, while the upper layer is solidified with cement to prevent the fine particles from scattering. There is a technology to suppress (for example, Patent Document 1).

JP 2008-31679 A

  By the way, since the fine particles exhibiting the pumping action by the capillary phenomenon as described in Patent Document 1 have a very small particle size range of about 0.005 to 0.15 mm, the road surface is cut particularly in places where the load on the road surface is high. When it is done, there is a problem that the fine particles are slightly scattered.

  The present invention has been made paying attention to such problems existing in the prior art. An object of the present invention is to provide an asphalt pavement, an asphalt pavement surface structure, and a method for forming an asphalt pavement that can suppress scattering of fine particles filled in the voids of a porous layer.

Hereinafter, means for solving the above-described problems and the effects thereof will be described.
An asphalt pavement that solves the above problems includes a porous layer based on an asphalt mixture, a group of fine particles that form micropores by being filled in the voids of the porous layer, and the voids of the porous layer In the above, the particle group forming pores by being filled on the surface layer side than the fine particle group, and the hydrophobicity that bonds the particles constituting the particle group to each other in the surface layer of the porous layer A resin and a surfactant that adheres to the inner walls of the pores to form a hydrophilic film in the surface layer.

  According to this configuration, the fine particles can be caught in the voids of the porous layer by adhering the fine particles filled on the surface layer side with the hydrophobic resin. In addition, hydrophobic resin is used to adhere particles in the surface layer, but a hydrophilic film is formed by attaching a surfactant to the inner walls of the pores formed by the particles. So it does not interfere with water penetration and evaporation. In addition, when a surfactant is mixed with the hydrophobic resin by applying a surfactant to the inner wall of the pores formed by the particles adhered with the hydrophobic resin to form a hydrophilic film, As a result, the curing time of the hydrophobic resin can be shortened. And by making the particle size of the granular material which fills the surface layer side from the fine particle in the void of the porous layer larger than that of the fine particle, scattering of the granular material is suppressed even when the road surface is shaved. Therefore, the scattering of the fine particles filled in the voids of the porous layer can be suppressed.

  The said asphalt pavement WHEREIN: It is preferable that the particle size range of the granule which comprises the said granule group is 0.005-0.15 mm, and the particle size range of the said granule is 0.08-0.4 mm.

  If the diameter of the particles filled in the porous layer is large, the particles are difficult to scatter, but the water pumping action due to capillary action is not exerted, so the water held in the micropores cannot be evaporated from the road surface. On the other hand, when the particle size of the granule is excessively small, the water-holding power is increased. On the other hand, when the particles are bonded with a hydrophobic resin, the voids become minute and the water permeability (drainage) on the road surface decreases. In that respect, according to the above configuration, since the particle size range of the granules is 0.08 to 0.4 mm, while maintaining the water permeability on the road surface, the pumping action by the capillary phenomenon is exerted and held in the micropores. Water can be evaporated from the road surface smoothly. Therefore, it is possible to effectively suppress the temperature rise of the road surface while suppressing the scattering of the fine particles.

In the porous layer, the asphalt pavement preferably has a surface layer thickness of 0.5 cm to 1 cm.
The fine pores formed by the fine particles with a small particle size have higher water retention capability than the pores formed by the particles, and the water pumping action by the capillary phenomenon is active, so the fine particles are placed close to the road surface. By doing so, the water retained in the micropores can be continuously vaporized, and the temperature rise effect on the road surface can be exhibited for a long time. On the other hand, if the surface layer filled with the particles is too thin, the particles may be exposed and scattered when the surface layer is shaved. In that respect, according to the above-described configuration, the thickness of the surface layer in the porous layer is 0.5 cm or more and 1 cm or less, so that the hydrophobic resin is arranged while promoting the vaporization of water by placing the fine particle group near the road surface. It is possible to secure the strength of the surface layer adhered by the above and to suppress the fine particles and the scattering of the particles.

The asphalt pavement road surface structure which solves the said subject is provided with the said asphalt pavement and the roadbed which has the water retention property which supports the said asphalt pavement.
According to this structure, the same effect as the said asphalt pavement can be obtained.

  A method for forming an asphalt pavement that solves the above problems includes a porous layer forming step of forming a porous layer based on an asphalt mixture, and fine pores by filling the voids of the porous layer with fine particles. In the fine particle filling step to be formed, and in the voids of the porous layer, the fine particle filling is performed to fill the surface layer side with the fine particle group mixed with the adhesive hydrophobic resin to form pores. And a surfactant spraying step of spraying a surfactant on the surface layer to form a hydrophilic film made of the surfactant on the inner wall of the pore.

  According to this structure, the same effect as the said asphalt pavement can be obtained.

  According to the present invention, in an asphalt pavement, it is possible to suppress scattering of fine particles filled in the voids of the porous layer.

The schematic diagram which shows one Embodiment of an asphalt pavement and an asphalt pavement road surface structure in a cross section. The schematic diagram which shows the structure of a porous layer. Asphalt pavement construction flow. The graph which shows the test result regarding the water retention of fine silica sand. The graph which shows the test result of the water absorption time of a silica sand layer.

  Hereinafter, an embodiment of an asphalt pavement, an asphalt pavement structure, and a method for forming an asphalt pavement will be described with reference to the drawings. The asphalt pavement and the asphalt pavement surface structure of the present embodiment can be suitably applied mainly to pedestrian roads, light vehicle passing roads, regional roads, and main roads.

  As shown in FIG. 1, the asphalt pavement road surface structure 11 according to the present embodiment includes an asphalt pavement 12 and a roadbed 13 having water retention property that supports the asphalt pavement 12. The roadbed 13 may be made of a normal pavement roadbed material. For example, using a roadbed material for water-permeable pavement such as a crushed stone or a crusher run, in addition to strength and durability, moderate water permeability and water storage are provided. It is preferable to provide.

  As shown in FIG. 2, the asphalt pavement 12 includes a porous layer 14 based on an asphalt mixture, a fine particle group composed of a large number of fine particles 21 filled in the voids of the porous layer 14, and a porous material. A particle group including a large number of particles 22 filled in the surface layer 15 side of the fine particles 21 in the voids of the layer 14. The fine particle group forms a large number of micropores 17 by filling the voids of the porous layer 14. The group of particles forms a large number of pores 18 by filling the voids of the porous layer 14. Further, the asphalt pavement 12 forms a hydrophilic film on the surface layer 15 of the porous layer 14 by adhering to the hydrophobic resin 23 that adheres the particles 22 constituting the particle group and the inner walls of the pores 18. And a surfactant 25.

  The porous layer 14 comprises a base material of, for example, an open-graded asphalt made of a mixture of aggregate 24 and asphalt. The porous layer 14 is preferably formed to a thickness of about 4 to 5 cm with a porosity of about 18 to 25% by volume. Further, the thickness of the asphalt pavement road surface structure 11 including the roadbed 13 is often about 14 to 25 cm.

  The fine particles 21 are, for example, mineral fine silica sand, and those having a particle size range of 0.005 to 0.15 m (5 to 150 μm) are preferably used. Moreover, it is preferable that the average particle diameter of such fine silica sand is about 0.08 to 0.2 mm. In addition, as a good example of fine silica sand having such a particle size, the quality of those calculated in Seto City, Aichi Prefecture is shown in Table 1.

The granule 22 is a granule having a particle size larger than that of the fine granule 21, and for example, No. 6 silica sand (particle size range 0.2 to 0.4 mm), No. 7 silica sand (particle size range 0.08 to 0.3 mm), etc. Is preferably used.

  The hydrophobic resin 23 is flexible and preferably does not use a volatile solvent or a non-reactive plasticizer as a component for safety of handling, such as a rubber-modified epoxy resin. An epoxy resin, an acrylic resin, a polyester resin, or the like can be used.

  The granules 22 are preliminarily mixed with the hydrophobic resin 23 and then filled in the voids of the aggregate 24 in the surface layer of the porous layer 14. The hydrophobic resin 23 mixed in the granules 22 adheres to the surfaces of the granules 22 while leaving gaps between the granules 22 and adheres the granules 22 to each other. The body 22 is bonded to the aggregate 24 of the porous layer 14. Further, the hydrophobic resin 23 attached to the granules 22 is cured, whereby the aggregates 24 are bonded to each other, and the strength of the surface layer 15 is improved.

  Since the hydrophobic resin 23 repels water, when it is used for adhesion of the granules 22 in the surface layer 15, it takes time to penetrate rainwater and the like, and a puddle is formed on the road surface after the rain, or water evaporation is suppressed. Resulting in. Therefore, in this embodiment, the water permeability in the surface layer 15 is ensured by covering the particles 22 bonded with the hydrophobic resin 23 with a hydrophilic film made of the surfactant 25.

  In the porous layer 14, the surface layer 15 filled with the particles 22 forms a resin silica sand layer by spraying a surfactant 25 after bonding the silica sand as the particles 22 with the hydrophobic resin 23. In the asphalt pavement road surface structure 11, a region filled with the fine silica sand as the fine particles 21 between the resin silica sand layer and the roadbed 13 is referred to as a fine silica sand layer 16. In the porous layer 14, the thickness of the surface layer 15 including the particles 22, the hydrophobic resin 23, and the surfactant 25 in the voids is preferably 0.5 cm or more and 1 cm or less.

Next, a method for forming the asphalt pavement 12 will be described based on the construction flow of the asphalt pavement 12.
First, as shown in FIG. 3, an asphalt mixture is laid on the roadbed 13 to form a porous layer 14 based on the asphalt mixture (porous layer forming step S11).

  Next, the fine particles 21 are filled into the voids of the porous layer 14 leaving 0.5 to 1 cm on the surface layer side of the porous layer 14 (fine particle filling step S12). Thereby, the fine particle group filled in the voids of the porous layer 14 forms a large number of fine holes 17. At this time, when a mixture of the fine particles 21 and water in a weight ratio of about 1: 1 is sprayed and allowed to flow naturally into the voids of the porous layer 14, workability is good. Further, when vibration is applied after the mixture of the fine particles 21 and water is filled in the voids of the porous layer 14, the fine particles 21 can be filled without gaps.

  Subsequently, in the voids of the porous layer 14, the voids left on the surface layer side of the fine particle group are filled with the particles 22 mixed with the hydrophobic resin 23 for bonding (particle filling step S13). As a result, the particle group filled in the voids of the porous layer 14 forms a large number of pores 18. The hydrophobic resin 23 is mixed with the granules 22 after mixing the main agent and the curing agent before construction. That is, by mixing the hydrophobic resin 23 and the particles 22, the particles 22 are covered with the hydrophobic resin 23, and the mixture of the hydrophobic resin 23 and the particles 22 is used as an aggregate 24 constituting the porous layer 14. Rub into the gap. At this time, if the pigment is mixed, the road surface can be colored.

  The hydrophobic resin 23 can also be used for bonding the granules 22 by rubbing into the gaps in the granules 22 after filling the gaps in the porous layer 14 with the granules 22. However, in this case, since the amount of use varies depending on the degree of penetration of the hydrophobic resin 23, the amount of use of the hydrophobic resin 23 is more appropriate if construction is performed after the hydrophobic resin 23 is mixed with the particles 22 in advance. Can be managed.

  Then, after the surface of the porous layer 14 filled with the particles 22 is leveled with rake or the like, a surfactant 25 is sprayed on the surface layer 15 to form a hydrophilic film by the surfactant 25 on the inner walls of the pores 18. (Surfactant spraying step S14).

  It is possible to ensure the water permeability of the surface layer 15 by previously mixing the surfactant 25 together with the hydrophobic resin 23 into the particles 22 and filling the mixture into the voids of the porous layer 14. . However, when the surfactant 25 is mixed, the curing time of the hydrophobic resin 23 becomes longer than when the surfactant 25 is not mixed, and the change in the curing time varies depending on the amount of the surfactant 25 mixed. Therefore, it becomes difficult to manage the mixing ratio of the surfactant 25.

  For example, when the surfactant 25 is not mixed, the curing time required for the hydrophobic resin 23 adhered to the surface of the granules 22 to cure is about 30 minutes in summer when the temperature is high, and in winter when the temperature is low. About 1 hour. On the other hand, when the surfactant 25 in an amount necessary to ensure the hydrophilicity of the surface layer 15 is mixed with the hydrophobic resin 23 and applied, the curing time is extended to several hours or more. In the present embodiment, in order to solve such problems, the surfactant 25 is sprayed after the particles 22 are bonded with the hydrophobic resin 23.

Next, the operation of the asphalt pavement 12 and the asphalt pavement road surface structure 11 configured as described above will be described.
In the asphalt pavement road surface structure 11, since the asphalt pavement 12 that forms the road surface is the porous layer 14, water such as rain water smoothly permeates through the gaps between the aggregate 24, the granules 22, and the fine granules 21, The road surface is drained promptly. In addition, although the hydrophobic resin 23 is used for adhering the particles 22 in the surface layer 15, the particles 22 bonded by the hydrophobic resin 23 are covered with a hydrophilic film by the surfactant 25. Does not interfere with water penetration and evaporation.

  In addition, since the fine particles 21 have a small particle diameter and a large capillary force as compared with the fine aggregates shown in Table 1, water that has permeated from the road surface enters the fine holes 17 that are voids formed by the fine particles 21. Water is retained. The fine aggregate is an aggregate containing 85% or more by weight that passes through the 10 mm sieve and passes through the 5 mm sieve, and typically, the aggregate that passes through the 5 mm sieve is 90% by weight. The aggregate passing through the sieve of ˜100% and 0.15 mm is the aggregate of 2 to 10% by weight.

  In FIG. 4, the result of the test done in order to compare the water retention using the fine aggregate shown in Table 1 and the fine silica sand as the fine particle 21 as a test body is shown. In this test, a cylindrical container having a diameter of 7.5 cm and a height of 200 cm was filled with fine aggregates and fine silica sand shown in Table 1 in a dry state, and 8 liters of tap water was injected from the upper surface. Then, after completion of the water injection, the water content ratio (water weight / dry weight of the test specimen) after standing for 2 weeks in a state where only 2 cm from the bottom surface is immersed in water is 10 cm upward from the bottom surface with a height of 5 cm as a reference. Measured at intervals.

  As shown in FIG. 4, fine silica sand has a water content ratio of about 2 to 3 times that of fine aggregates at each height position as compared with fine aggregates, particularly 7 to 9 at height positions of 45 to 85 cm. The water content is doubled. Further, the fine aggregate has a water content ratio that decreases as the height position increases, and the water content ratio is about 10% at a height position of 25 cm.

  On the other hand, the fine silica sand has a water content ratio of approximately 45% up to a height position of 5 to 45 cm, and the water content ratio gradually decreases at higher height positions, but even at a height position of 75 cm. The water content is maintained at about 40%. As this test result shows, it can be said that the fine silica sand has a high water retention capability by forming fine continuous voids and has a high pumping action by capillary action.

  For this reason, water that has permeated from the road surface during raining or the like is held around the fine particles 21 filled with the porous layer 14 or the roadbed 13 having water retention, and when water evaporates from the road surface during fine weather, Water held in the porous layer 14 and the roadbed 13 is pumped and supplied to the road surface side.

  When the road surface temperature rises, especially in summer, the road surface temperature can be lowered by evaporating the water retained in the porous layer 14 from the road surface. In addition, by pumping the water retained in the porous layer 14 and the roadbed 13 and supplying the water to the road surface side, the road surface temperature reduction effect can be continued for a long time.

  Here, the silica sand with which the surface layer 15 of the porous layer 14 is filled as the granules 22 has a higher pumping effect as the particle size range of the granules is smaller, and therefore has a higher road surface temperature reduction effect. For example, when the surface layer 15 is filled with No. 4 silica sand (particle size range: 0.6 to 1.2 mm), the particle size is large, and the pumping action by capillary action cannot be sufficiently obtained. Moreover, when the surface layer 15 is filled with No. 5 silica sand (particle size range: 0.3 to 0.8 mm), although there is a pumping action due to a capillary phenomenon, the pumping speed is not sufficient and the temperature reduction effect is not sufficient. That is, it is desirable that the fine particles 21 and the particles 22 filled in the porous layer 14 have a small particle size that can exert a pumping action by capillary action.

  On the other hand, when the surface layer 15 is filled with No. 8 silica sand (particle size range 0.05 to 0.2 mm), the water pumping effect is high, but the gap between the silica sands becomes too small, so that the water permeability on the road surface cannot be secured. . Therefore, it is desirable that the particles 22 filled in the surface layer 15 of the porous layer 14 have a particle size that is large enough to ensure water permeability from the road surface when solidified with the hydrophobic resin 23.

  In this respect, when the silica sand to be filled in the surface layer 15 as the granules 22 is changed to No. 6 silica sand (particle size range 0.2 to 0.4 mm) or No. 7 silica sand (particle size range 0.08 to 0.3 mm), the water permeability of the road surface. Sufficient pumping action can be obtained while ensuring the above.

  In order to continuously exert the effect of reducing the temperature on the road surface, even when the temperature of the road surface that has absorbed heat from solar radiation becomes about 60 degrees in summer and the amount of water evaporation increases, 15, the water held by the fine silica sand layer 16 needs to be pumped toward the road surface at a predetermined speed.

  In FIG. 5, a fine silica sand layer (layer thickness 42 to 52 mm) filled with fine silica sand is provided in a cylindrical container, and a silica sand layer (layer thickness 5 to 15 mm) filled with silica sand is further provided thereon. The result of the test which measured the water absorption time (pumping time) when the total thickness of a fine silica sand layer and a silica sand layer was 57 mm and only 7 mm was immersed in water from the bottom face of the fine silica sand layer is shown. In this test, as a silica sand layer, No. 6 silica sand and No. 7 silica sand were prepared so that the layer thicknesses would be 0 mm, 5 mm, 10 mm, and 15 mm, respectively, and each silica sand layer was bonded with an epoxy resin. Then, the time until the entire surface of each test body became wet was measured as the water absorption time.

  In this test, the test specimen having a 0 mm thickness of the silica sand layer is filled with fine silica sand instead of the silica sand, and consists of only the fine silica sand layer having the same layer thickness as the other test specimens. In this test, silica sand is bonded with a water-soluble epoxy resin. In this case as well, when a silica film is bonded with a hydrophobic epoxy resin, a hydrophilic film is formed by the surfactant 25. The same water permeability and strength can be obtained.

  As shown in FIG. 5, when the water absorption time is compared between No. 6 silica sand and No. 7 silica sand, the water absorption time of No. 7 silica sand with a smaller particle size range is slightly shorter than that of No. 6 silica sand, but there is a large difference between them. In any case, when the thickness of the silica sand layer was 10 mm or less, a water absorption rate equivalent to that of the fine silica sand layer was obtained.

  Therefore, if the thickness of the surface layer 15 including the particles 22 in the porous layer 14 is 1 cm or less as in the present embodiment, the surface layer 15 is held on the fine silica sand layer 16 or the roadbed 13 without reducing the pumping speed. Water can be supplied to the road surface. However, if the thickness of the surface layer 15 is less than 0.5 cm, the fine silica sand layer 16 may be exposed and the fine particles 21 may be scattered when the surface layer 15 is shaved by passing a vehicle or the like. The thickness of 15 is preferably 0.5 cm or more.

  And according to the asphalt pavement 12 of this embodiment, the water which permeate | transmitted from the road surface is hold | maintained to space | gap, such as the micropore 17 and the pore 18, ensuring the favorable water permeability in a road surface at the time of raining etc. By evaporating the water retained from the road surface during fine weather, it is possible to suppress the temperature rise of the road surface by the heat of vaporization. In addition, since the roadbed 13 of the asphalt pavement road surface structure 11 has water retention capacity, the water retained on the roadbed 13 can be pumped and evaporated from the road surface, so that the effect of increasing the temperature of the road surface can be maintained. become.

  As a comparative example with respect to the present embodiment, when the surface layer of the porous layer 14 is solidified with cement containing the particles 22 or the fine particles 21, a white phenomenon in which a white product appears on the surface as time passes, Color unevenness due to hue change caused by the color may occur, which may affect the beauty. In that respect, by adhering the particles 22 with the hydrophobic resin 23 having little influence on the appearance, it is possible to suppress the white flower phenomenon and maintain the aesthetic appearance of the road surface. Further, when solidifying with cement, it is difficult to uniformly color the road surface, whereas when using the hydrophobic resin 23, the road surface can be easily colored by mixing pigments. It is possible to improve the aesthetics of the road surface.

According to the embodiment detailed above, the following effects are exhibited.
(1) By adhering the particles 22 filled on the surface layer 15 side with respect to the fine particle group by the hydrophobic resin 23, the fine particles 21 can be caught in the voids of the porous layer 14. In addition, although the hydrophobic resin 23 is used for adhering the particles 22 in the surface layer 15, the hydrophilic film is attached to the inner wall of the pores 18 formed by the particles by adhering the surfactant 25. Does not hinder the penetration and evaporation of water. Further, the surfactant 25 is mixed with the hydrophobic resin 23 by forming the hydrophilic film by adhering the surfactant 25 to the inner walls of the pores 18 formed by the particles adhered with the hydrophobic resin 23. The curing time of the hydrophobic resin 23 can be shortened compared to the case where the construction is performed. Further, by increasing the particle size of the particles 22 that are filled on the surface layer 15 side of the fine particles 21 in the voids of the porous layer 14, the particles 22 are scattered even when the road surface is scraped. Is suppressed. Therefore, scattering of the fine particles 21 filled in the voids of the porous layer 14 can be suppressed.

  (2) When the particle 22 filled in the porous layer 14 has a large diameter, it is difficult to scatter, but the water pumping action due to the capillary phenomenon is not exerted, so the water held in the micropores 17 is evaporated from the road surface. I can't. On the other hand, if the particle size of the granule 22 is excessively small, the water holding power is increased, while the pores become minute when bonded with the hydrophobic resin 23, and the water permeability (drainage) on the road surface decreases. . In that respect, according to the above embodiment, the particle size range of the granules 22 is 0.08 to 0.4 mm. Therefore, while ensuring the water permeability on the road surface, the pumping action by the capillary phenomenon is exhibited, and the micropores 17 The water held in the water can be smoothly evaporated from the road surface. Therefore, the temperature rise of the road surface can be effectively suppressed while suppressing the scattering of the fine particles 21.

  (3) The fine pores 17 formed by the fine particles 21 having a small particle diameter have higher water retention than the fine pores 18 formed by the particles 22, and the pumping action by capillary action is active. Can be continuously vaporized by disposing at a position close to the road surface, and the temperature rise effect on the road surface can be exhibited for a long time. On the other hand, if the surface layer 15 filled with the particles 22 is too thin, the particles 21 may be exposed and scattered when the surface layer 15 is shaved. In that respect, according to the above-described embodiment, the thickness of the surface layer 15 in the porous layer 14 is 0.5 cm or more and 1 cm or less, so that the fine particle group is arranged near the road surface to promote vaporization of water, The strength of the surface layer 15 bonded by the hydrophobic resin 23 can be secured, and scattering of the fine particles 21 and the particles 22 can be suppressed.

(Example of change)
In addition, the said embodiment can also be changed and actualized as follows. Moreover, the following modified examples can be arbitrarily combined.

  The method for forming the asphalt pavement 12 can also be used for repairing the asphalt pavement road surface structure 11. For example, in an asphalt pavement different from the above-described embodiment, when repairing a part where the surface is partially scraped and the aggregate 24 of the porous layer 14 is dropped, the fine particles are obtained after repairing the base made of the asphalt mixture. The body 21 is filled. Further, the surface layer is filled with the particles 22 mixed with the hydrophobic resin 23, and the surfactant 25 is dispersed. In this way, the action of the cured hydrophobic resin 23 can ensure the water permeability of the road surface while reinforcing the road surface when repairing a portion having a high load on the road surface.

  Intermediate layer filled with granules 22 not solidified by hydrophobic resin 23 between surface layer 15 containing granules 22 and hydrophobic resin 23 and fine silica sand layer 16 filled with fine silica sand as fine granules 21 (Silica sand layer) may be present.

The quality including the average particle diameter of the fine particles 21 is not limited to that exemplified in the above embodiment, and any fine particles 21 can be used as long as sufficient water retention and pumping action can be secured.
The quality including the particle size range of the granules 22 is not limited to that exemplified in the above embodiment, and any granules 22 can be used as long as appropriate water permeability and pumping action can be secured in a state solidified with a hydrophobic resin. it can.

  The hydrophobic resin 23 for adhering the particles 22 is not limited to an epoxy resin, and any hydrophobic resin can be used as long as there is little unevenness during curing and water absorption and water retention after curing can be secured. be able to.

The thickness of the surface layer 15 including the particles 22 and the hydrophobic resin 23 in the porous layer 14 may be less than 0.5 cm when sufficient strength can be secured.
-In the porous layer 14, the thickness of the surface layer 15 containing the granule 22 and the hydrophobic resin 23 may be thicker than 1 cm, when sufficient pumping action can be ensured.

  DESCRIPTION OF SYMBOLS 11 ... Asphalt pavement road surface structure, 12 ... Asphalt pavement, 13 ... Roadbed, 14 ... Porous layer, 15 ... Surface layer, 17 ... Fine pore, 18 ... Fine pore, 21 ... Fine granule, 22 ... Granule, 23 ... Hydrophobic Resin, 25 ... surfactant.

Claims (5)

A porous layer based on an asphalt mixture;
A group of fine particles that form micropores by filling the voids of the porous layer;
In the voids of the porous layer, a particle group that forms pores by being filled closer to the surface layer side than the fine particle group, and
In the surface layer of the porous layer, a hydrophobic resin that bonds the particles constituting the particle group, and
In the surface layer, a surfactant that adheres to the inner wall of the pore to form a hydrophilic film;
Asphalt pavement with The particle size range of the fine particles constituting the fine particle group is 0.005 to 0.15 mm,
The asphalt pavement according to claim 1, wherein a particle size range of the granules is 0.08 to 0.4 mm. The asphalt pavement according to claim 1 or 2, wherein the surface layer has a thickness of 0.5 cm or more and 1 cm or less in the porous layer. Asphalt pavement according to any one of claims 1 to 3,
A roadbed having water retention to support the asphalt pavement,
Asphalt paved road surface structure. A porous layer forming step of forming a porous layer based on an asphalt mixture;
A fine particle filling step of filling the voids of the porous layer with fine particle groups to form fine pores;
In the voids of the porous layer, a particle filling step of forming pores by filling a particle group mixed with a hydrophobic resin for adhesion on the surface layer side of the fine particle group,
A surfactant spraying step of spraying a surfactant on the surface layer and forming a hydrophilic film with the surfactant on the inner wall of the pores;
A method for forming an asphalt pavement comprising: