JP2006283380A - Water-retentive/moisture-permeable pavement and construction method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water-retentive/moisture-permeable pavement structure stably suppressing a rise in ground temperature over a long period of time. <P>SOLUTION: This water-retentive/moisture-permeable pavement structure comprises: a first water-permeable member layer 1 which is laid on the upper section of a water-permeable foundation course G; a water-retentive layer 2 which has a water-retentive material 22 laid on the upper part of the layer 1; and a second water-permeable member layer 3 which is laid on the upper section of the layer 2. In the water-retentive/moisture-permeable pavement structure, the material 22 cannot pass through the layers 1 and 3. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a water-permeable pavement for paving roads and the like.

  In urban areas, the water environment and thermal environment have changed remarkably as the road pavement rate has increased, and various problems have arisen.

  In particular, regarding the thermal environment, the decrease in the water retention function of the ground due to the progress of paving leads to a decrease in the cooling effect on the atmosphere due to moisture evaporation from the ground surface, and is also one of the causes of the heat island phenomenon particularly in urban areas.

  Conventionally, in order to solve such problems, water is passed through the paved surface by paving the road with cement concrete, porous concrete or open-graded asphalt concrete, which is a porous material called permeable concrete. Attempts have been made to effectively avoid an increase in ground temperature by utilizing the fact that the water takes heat from the pavement surface as the heat of vaporization by evaporating.

As an example, a technique for evaporating the water retained in the water retaining material by partially filling the voids of the water-permeable concrete with the water retaining material is disclosed (for example, Patent Documents). 1). Furthermore, in the pavement structure disclosed in the same document, a coarse aggregate is laid on the upper part of the base layer, a water retention material is filled in the gap between the coarse aggregates, and a water permeable resin mortar is further filled in the upper layer of the water retention material. Another object of the present invention is to cover the resin mortar with a water retention agent to avoid the loss of the water retention material due to traffic such as vehicles on the paved surface.
Japanese Patent Laid-Open No. 2004-3158

  However, the problem in pavement using a water retaining material is not only the problem related to the loss of the water retaining material due to traffic such as the above-mentioned vehicles.

  That is, even if it is what was described in patent document 1 mentioned above, it may happen that a water retention material flows out to the base layer side. With such a thing, not only cannot the water retention power near the pavement surface be maintained for a long period of time, but also a gap where no water retention material is present is formed between the location where the water retention material was disposed and the resin mortar as the upper layer. . In that case, it becomes difficult for the water to move upward from the base layer side through the water retaining material particularly in the void, and even if the water is sufficiently retained on the base layer side, the water cannot be sufficiently evaporated up. . Therefore, the temperature of the pavement surface tends to rise.

  This invention pays attention to such a malfunction, and provides the water retention and moisture-permeable pavement structure which can suppress the raise of ground temperature stably for a long period of time.

  In order to achieve such an object, the present invention takes the following measures. That is, the water-retentive and moisture-permeable pavement according to the present invention is laid on the upper part of the base layer having water permeability, and includes a first water-permeable member layer laid on the upper part of the base layer, and the first water-permeable member layer. A water retentive layer having a water retentive material laid on top of the water retentive member layer, and a second water permeable member layer laid on top of the water retentive layer, wherein the water retentive material is the first water permeable member layer. And it is comprised so that it may not pass through the 2nd water-permeable member layer.

  If it is such, it can prevent the outflow to the base layer of a water retention material, and scattering upwards. That is, it is possible to effectively avoid a decrease in water retention capacity due to scattering / reduction of the water retention material and the formation of a void without the water retention material due to the water retention material flowing down. As a result, the pavement not only can stably evaporate water to the road surface side for a long time, but also can stably transfer water on the base layer side to the road surface side, and stably prevents the temperature rise on the ground surface for a long time. It can be. Further, excess water that cannot be retained by the water retaining material is reduced to the base layer through the first water permeable member layer.

  In order to effectively improve the strength of the water-retaining layer, the water-retaining layer is constituted by the water-retaining material and a pavement member having a coarse aggregate, and the gap between the coarse aggregates in the pavement member It is desirable to arrange a water retaining material. Here, the coarse aggregate refers to the one having the same particle size as the crushed stone for road defined in JIS A5001.

  And as a concrete configuration of the pavement member, the pavement member is an open-graded asphalt mixture obtained by mixing coarse aggregate and asphalt having a particle size of 13 mm or less, or an aggregate having a particle size of 2.5 to 20 mm. The thing made into the water-permeable cement concrete which mixed cement and water can be mentioned.

  And as a concrete thing of the water retention material which can be suitably arrange | positioned in the gap | intervals of the above pavement members, it is desirable to make the said water retention material contain inorganic powder. Here, as inorganic powders that can be suitably applied as water retention materials, mineral water retention materials such as zeolite, vermiculite and perlite, clay-based water retention materials typified by silty clay, diatomaceous earth and silica sand, etc. Can be mentioned. Furthermore, examples of desirable water retention materials include those containing a water retention polymer.

And in order to make it difficult to pass the water retentive material regardless of the particle size of the water retentive material, i.e., impractical to pass through, the first water permeable member layer and the second water permeable member layer, It is desirable to have a fine-grained porous member having fine aggregate and having a maximum particle diameter of 2.5 mm or less. Here, the fine aggregate is smaller than the particle size of the coarse aggregate. Specific examples of the fine particle size porous member include a mixture of any one of cement, asphalt or resin and the above-described fine aggregate.
And, the fine particle size porous member constituting the second water permeable member layer is a mixture of cement or resin and the fine aggregate, and the second water permeable member layer is exposed upward. If it exists, since the reflectance of sunlight will become high with the color of the said cement or resin, the raise of surface temperature can be suppressed effectively compared with the case where it is set as the asphalt mixture which employ | adopted asphalt, for example.

  The construction method of the water retention / moisture permeable pavement according to the present invention for laying the water retention layer having the water retention material on the upper layer of the water permeable base layer is configured to prevent the water retention material from passing above the base layer. A first water permeable member layer laying step for laying a member layer; a water retentive layer laying step for laying a water retentive layer; and a second water permeable member layer laying step for laying a water permeable member layer above the water retentive layer. If it contains, the water retention and moisture-permeable pavement which has the structure mentioned above can be laid suitably.

  Furthermore, in order to suitably lay a water retaining layer having high strength and high water retention capacity, the water retaining layer is constructed by the water retaining material and a pavement member having a coarse aggregate. It is desirable that the process includes a pavement member laying step for laying the pavement member, and a water retention material filling step for filling a gap between coarse aggregates with a water retention material.

  The outflow of the water retaining material to the base layer and the upward scattering can be prevented together. That is, it is possible to effectively avoid a decrease in water retention capacity due to scattering / reduction of the water retention material and the formation of voids without the water retention material due to the water retention material flowing downward. As a result, the pavement not only can stably evaporate water to the road surface side for a long time, but also can stably transfer water on the base layer side to the road surface side, and stably prevents the temperature rise on the ground surface for a long time. It can be. Further, excess water that cannot be retained by the water retaining material is reduced to the base layer through the first water permeable member layer.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 shows a water retentive / moisture permeable pavement A according to the present embodiment, which is suitably laid on a base layer G formed of, for example, water-permeable, open-graded asphalt concrete having water permeability.

  Here, the water-retaining and moisture-permeable pavement A according to the present embodiment is laid on the upper part of the base layer G having water permeability, and the first water-permeable member layer 1 laid on the upper part of the base layer G; The water retention layer 2 having a water retention material 22 laid on the upper part of the first water permeable member layer 1 and the second water permeable member layer 3 laid on the upper part of the water retention layer 2, The material 22 is configured not to pass through the first water-permeable member layer 1 and the second water-permeable member layer 3.

  Moreover, the construction method of the water retentive / moisture permeable pavement A according to the present embodiment is a construction method for laying the water retentive layer 2 having the water retentive material 22 on the upper layer of the water permeable base layer G. A first water permeable member layer laying step for laying a water permeable member layer configured such that the water retentive material 22 cannot pass therethrough; a water retentive layer laying step for laying the water retentive layer 2; and an upper portion of the water retentive layer 2 And a second water permeable member layer laying step for laying the second water permeable member layer 3.

  Hereinafter, the specific configuration of the water-retentive and moisture-permeable pavement A will be described in detail with reference to FIG.

  In the present embodiment, the base layer G schematically illustrates a place where paving has already been performed so as to have water permeability. However, the base layer G may be applied to a soil roadbed, that is, a place where soil is exposed.

  The first water permeable member layer 1 is a fine particle porous member having fine aggregate and having a maximum particle diameter of 2.5 mm or less. Here, the fine aggregates are those defined in JIS A0203 2311. Further, in this embodiment, this fine particle size porous member is a cement hardened body hardened with cement. However, as long as it has water permeability even if it is other than the cement hardened body, asphalt or resin and fine aggregate It is good also as a mixture of these. In the present embodiment, the first water permeable member layer 1 also includes a part of a paving member OG described later.

  The water retention layer 2 is composed of a coarse aggregate 21 and a water retention material 22. And the water retention material 22 is arrange | positioned in the clearance gap between the coarse aggregate 21 in the pavement member OG. In the illustrated example, the water retaining materials 22 are shown to be scattered in the gaps between the coarse aggregates 21, but in actuality, the water retaining materials 22 are in contact with each other in three dimensions, and are vertically Between the first and second permeable member layers 1 and 3 laid on the surface.

  More specifically, the water retention layer laying step described above is performed by performing a water retention material filling step of filling the gap between the coarse aggregates 21 with the water retention material 22 after the pavement member laying step of laying the pavement member OG. Layer 2 is laid.

  The pavement member OG is an open-graded asphalt mixture obtained by mixing coarse aggregate 21 having a particle size of 13 mm or less and asphalt c. Specifically, there is a thin asphalt c film on the surface of the coarse aggregate 21, and this asphalt c film maintains the strength of the entire pavement member OG by fixing adjacent coarse aggregates 21 to each other. It has become. Alternatively, the pavement member OG may be water-permeable cement concrete obtained by mixing coarse aggregate 21 having a particle diameter of 2.5 to 20 mm, cement, and water. In the present embodiment, the upper part of the pavement member OG exceeds the second water-permeable member layer 3 described later, and the upper part is exposed upward, and the lower part is the first water-permeable member layer. The aspect which has exceeded 1 and is contacting the base layer G is illustrated.

  In this embodiment, the water retention material 22 is exemplified by a water retention polymer, but examples of the water retention material 22 include mineral water retention materials, quartz sand, diatomaceous earth, and the like in addition to the water retention polymer. Moreover, although the particle size or diameter of the water retention polymer constituting the water retention material 22 can vary depending on the volume of water retained (FIG. 4), the particle size of the water retention material 22 in the water retention material filling step described above is For example, it is set to 0.3 mm or less.

  The second water permeable member layer 3 has substantially the same configuration as the first water permeable member layer 1 described above. That is, it is mainly composed of a fine-grained porous member having fine aggregate and having a maximum particle diameter of 2.5 mm or less. Further, in this embodiment, the fine particle size porous member is a fine aggregate and, for example, a mixture of cement and water, that is, cement concrete. It is good also as a mixture of and a fine aggregate. In the present embodiment, the second water-permeable member layer 3 includes the upper portion of the above-described pavement member OG, so that the strength is improved.

  A series of water flows when the increase in the ground temperature, that is, the increase in the temperature of the road surface 3a is suppressed by the water retention / moisture permeable pavement A having the above-described configuration will be described in detail with reference to FIGS. In addition, the thick arrow in a figure has shown the flow of water, and the wavy line of FIG. 3 has shown evaporation / transpiration of water.

  First, the movement of water during sunshine is shown in FIG. In addition, in this embodiment, the sunshine time when the ground temperature rises by sunlight is illustrated.

  More specifically, after the water originally held on the base layer G side moves to the water retention layer 2 through the first water permeable member layer 1, it moves upward through the water retention material and moves to the second water permeable member layer. Evaporate upward through 3

  On the other hand, at the time of rain, water due to the rain moves along the second water permeable member layer 3 to the water retention layer 2 and is absorbed by the water retention material 22. Moreover, the excess water that the water retaining material 22 could not absorb has moved downward and moved to the lower side, that is, the base layer G through the first water permeable member layer 1.

  As described above, the water retention / moisture permeable pavement A according to the present embodiment laid on the upper part of the base layer G includes the first water permeable member layer 1 and the water retention layer 2 including the water retention material 22; It consists of the 2nd water permeable member layer 3, and it is comprised so that the water retention material 22 cannot pass the 1st water permeable member layer 1 and the 2nd water permeable member layer 3. It is characterized by the above-mentioned. Specifically, in order to lay the water retaining layer 2 having the water retaining material 22 on the upper layer of the water permeable base layer G, a water permeable member layer configured not to allow the water retaining material 22 to pass therethrough is laid on the base layer G. A first water permeable member layer laying step, a water retentive layer laying step for laying the water retentive layer 2, and a second water permeable member layer laying step for laying the water permeable member layer above the water retentive layer 2. The construction method of the water-retentive and moisture-permeable pavement A containing is adopted.

  By setting it as such, since the outflow to the base layer G of the water retention material 22 and the scattering to the upper direction, ie, the road surface 3a, can be prevented together, the water retention capability is reduced due to the water retention material 22 scattering or reduction. In addition, it is possible to effectively avoid the formation of voids in which the water retaining material 22 does not exist due to the water retaining material 22 flowing to the base layer G side. As a result, the water retentive / moisture permeable pavement A can not only stably evaporate water to the road surface 3a side for a long time but also can stably transfer water from the base layer G side to the road surface 3a side to evaporate. As a result, the temperature rise of the road surface 3a can be stably prevented for a long period of time. In addition, surplus water that cannot be retained by the water retaining material 22 is suitably reduced to the base layer G through the first water permeable member layer 1.

  More specifically, the water retention layer 2 is constituted by the pavement member OG having the coarse aggregate 21 and the water retention material 22, and the water retention layer laying step is a pavement member laying step for laying the pavement member OG. Since the construction method including the water retaining material filling step of filling the water retaining material 22 in the gaps between the coarse aggregates 21 is adopted, the water retaining layer 2 having high strength is suitably laid. Since the pavement member OG is an open-graded asphalt mixture in which the coarse aggregate 21 having a particle size of 13 mm or less and the asphalt c are mixed, the water retaining material 22 can be suitably disposed in the gap between the coarse aggregates 21. It has become. And in this embodiment, since the water retention material 22 shall consist of a water retention polymer, a large amount of water can be absorbed and hold | maintained and the suppression effect of a temperature rise can be maintained for a long time.

  Moreover, the 1st water-permeable member layer 1 and the 2nd water-permeable member layer 3 are made into the fine particle size porous member which has a fine aggregate and the largest particle size of the aggregate which contains is 2.5 mm or less. Therefore, regardless of the maximum particle diameter of the water retaining material 22, the water retaining material 22 is extremely difficult to pass through, in other words, it cannot be practically passed. The fine particle size porous member can sufficiently exhibit the above-mentioned effect if it is a mixture of cement, asphalt c or resin and the above-mentioned fine aggregate, but in this embodiment, it is exposed upward. Since the fine particle size porous member constituting the second water permeable member layer 3 is cement concrete, the reflectance of sunlight is higher than that of, for example, asphalt depending on the color of the cement. The rise can be effectively suppressed. Of course, even when the fine particle size porous member is a mixture of fine aggregate and resin, the same effect can be obtained.

  Although the embodiment of the present invention has been described above, the specific configuration of each unit is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

  For example, in the above embodiment, the aspect in which the water retention polymer is employed as the water retention material is described, but in addition to the water retention polymer, for example, mineral water retention material, clay water retention material, inorganic powder such as diatomaceous earth or quartz sand is employed. Even if it is a thing, there exists an effect similar to the said embodiment.

  In addition, the specific configuration of each part is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

  Hereinafter, although the Example concerning this invention is explained in full detail, this invention is not limited to the said Example.

<1. Infrared irradiation test>
Using the water retention / moisture permeable pavement shown in Examples 1 to 11 according to the above-described embodiment and Comparative Examples 1 to 3, the difference in surface temperature when irradiated with infrared rays for 120 minutes and 24 hours was investigated. .
<1.1 Materials used>
The materials used are described below, and the detailed composition or composition is shown in Table 1.

<Pavement material with water permeability and drainage>
The following pavement members were used as pavement members having water permeability and drainage properties.
Open grain size ascon: Open grain asphalt mixture Polacon with a porosity of 20% with a maximum coarse aggregate particle size of 13 mm (M13): Porous concrete polacon with a porosity of 20% with a maximum coarse aggregate particle size of 13 mm (M5): Maximum coarse Porous concrete with 5% porosity and 25% porosity <Water retaining material>
6 types of water-retaining materials such as mineral water-retaining materials, water-retaining polymers (manufactured by Toyobo Co., Ltd .: ESPEC L) + silica sand No. 8, silica sand No. 8, clay water-retaining materials, mineral water-retaining materials + cement and diatomaceous earth Was used. In addition, as a grout material in cement milk used for the comparative example, Sumitomo Osaka Cement Co., Ltd .: New Fan Coat was used in detail.
<Porous particle porous member>
The following three types of fine particle porous members were used. In addition, the particle size of the sand in Table 1 is 0.6 to 2.5 mm, that is, the 2.5 mm sieve is completely passed and the 0.6 mm sieve is not passed.
Cement (M2.5): Water-permeable cement mortar asphalt having a maximum particle size of 2.5 mm (M2.5): Water-permeable asphalt mixture resin having a maximum particle size of 2.5 mm (M2.5): Maximum particle size 5 mm water permeable resin mortar <1.2 Test method>
<Production of specimen>
The above-mentioned water-permeable / drainage pavement member is molded to 30 × 30 × 5 cm, and after sealing this side surface, a fine particle porous member is applied to the bottom surface of the pavement member to a thickness of 3 mm. Then, after filling the pavement member with a water retention material, a specimen was prepared by applying a fine particle size porous member to the upper surface with a thickness of 3 mm. In addition, as shown in Table 2, the types of specimens were 14 types in total including Examples 1 to 11 and Comparative Examples 1 to 3. Moreover, about the thing which does not describe the use material in a table | surface, the corresponding preparation process was abbreviate | omitted and the test piece was produced.
<Irradiation test>
After sprinkling water on the specimens according to the examples and comparative examples prepared, a 500 W infrared light was placed at a position 30 cm high from the surface of each specimen and irradiated, and the surface after 120 minutes and 24 hours later Each temperature was measured with a thermocouple.

  <1.3 Test results>

Table 2 shows the test results. Since the comparative example 1 does not have a water retaining material and shows the highest temperature during the test, the temperature difference from the comparative example 1 is shown in the table. Regarding Comparative Example 2, the surface temperature is high because the cement milk filled in the gap between the paving members does not have water retention. However, since the fine particle size porous member on the surface exhibits a high brightness color, the surface temperature is slightly lower than that of Comparative Example 1. Comparative Example 3 has a water retaining material, but does not have a fine-grained porous member on the bottom surface. Instead, it is hardened with cement so that the water retaining material does not flow out. Although the rise is suppressed to some extent, it is inferior in sustainability.
Regarding Examples 1 to 5, unlike Comparative Example 3, since the pavement member is filled with only the water retention material component without using cement, the temperature rise is suppressed even if the type of the water retention material is different, It also has sustainability. In addition, Example 2 which employ | adopted water retention polymer + silica sand No. 8 as a water retention material has shown the effect which suppresses a temperature rise most.
From the results of Examples 6 and 7, it can be seen that the rise in temperature is suppressed by the water-retaining material component that is filled even if the type of pavement member is different.
From the results of Examples 8 and 9, it can be seen that the rise in temperature is suppressed by the water-retaining material component even if the type of the fine-grained porous member on the bottom surface is different.
From the result of Example 10, the surface fine particle size porous member is asphalt, and since the color is black, the temperature is higher than the other examples, but the temperature is higher than that of Comparative Examples 1 to 3. Since it is low, it turns out that the rise in temperature is suppressed by the water retention material.
And about Example 11, even if it is what used the fine particle size porous member of the surface as resin, like Example 7 which employ | adopted cement, the rise in temperature was suppressed by the effect of the water retention material, and the effect of the said It also has sustainability.

<2. Overflow control test of water retaining material due to rain>
Watering with a watering can and a hose was performed on the specimens according to the examples and comparative examples, respectively, and the overflow of the water retaining material that occurred at that time, that is, the loss was investigated.
<2.1 Materials used>
<Pavement material with water permeability and drainage>
As a paving member having water permeability and drainage, an open particle size ascon, that is, an open particle size asphalt mixture having a maximum coarse aggregate particle size of 13 mm and a porosity of 20% was used.
<Water retention material>
As the water retention material, the mineral water retention material in Table 1 or silica sand No. 8 was used.
<Porous particle porous member>
As the fine particle size porous member, one corresponding to the cement (M2.5) in Table 1, that is, a water permeable cement mortar using an aggregate having a particle size of 0.6 to 2.5 mm was used.
<2.2 Test method>
<Production of specimen>
The water-permeable / drainage pavement member described above is molded to 30 × 30 × 5 cm, and the side surfaces are sealed, and then a fine particle porous member is applied to the bottom surface of the pavement member to a thickness of 3 mm. Then, after filling the pavement member with a water retention material, a specimen was prepared by applying a fine particle size porous member to the upper surface with a thickness of 3 mm. In addition, as shown in Table 3, the types of specimens were 4 types in total: Examples 1 and 5 and Comparative Examples 4 and 5. Moreover, about the thing which does not describe the use material in a table | surface, the corresponding preparation process was abbreviate | omitted and the test piece was produced.
<Mass measurement of watering and solid residue>
Watering the surface of the prepared specimen with a watering can and a hose respectively, then filtering the overflowed water, measuring the mass of the solid residue after drying, the solid content of the water retaining material overflowed according to the following formula ( %) Was calculated.
(Solid content (%) of overflowing water retaining material = solid residue (g) ÷ water retaining material filling amount (g) × 100)
<Irradiation test>
After sprinkling water on the specimens according to the examples and comparative examples, a 500 W infrared light was placed at a position 30 cm in height from the surface of each specimen and irradiated, and the surface temperature after 24 hours was adjusted to thermoelectricity. Measured by pair.
<2.3 Test results>

Table 3 shows the test results. Regarding Comparative Example 4 and Comparative Example 5, the water retention material overflows due to watering, and the effect of suppressing the temperature rise is small. However, for Example 1 and Example 5, by providing a fine particle size porous member, No overflow of the water retaining material due to watering was observed. Even if compared with the examples in the infrared irradiation test, the effect of suppressing the temperature rise was shown to the same extent.
<3. Tire running test>
A tire running test was conducted using the following materials and test methods.
<3.1 Materials Used>
<Pavement material with water permeability and drainage>
As the pavement member having water permeability and drainage, those corresponding to the open grain size ascon in Table 1 were adopted.
<Water retention material>
As a water retention material, the thing corresponding to the mineral type water retention material in Table 1, or quartz sand No. 8 was used.
<Porous particle porous member>
As the fine particle size porous member, one corresponding to the cement (M2.5) in Table 1, that is, a water permeable cement mortar using an aggregate having a particle size of 0.6 to 2.5 mm was used.
<3.2 Test method>
<Production of specimen>
The water-permeable / drainage pavement member described above is molded to 30 × 30 × 5 cm, and the side surfaces are sealed, and then a fine particle porous member is applied to the bottom surface of the pavement member to a thickness of 3 mm. Then, after filling the pavement member with a water retention material, a specimen was prepared by applying a fine particle size porous member to the upper surface with a thickness of 3 mm. In addition, as shown in Table 4, the types of specimens were 4 types in total: Examples 1 and 5 and Comparative Examples 4 and 5. Moreover, about the thing which does not describe the use material in a table | surface, the corresponding preparation process was abbreviate | omitted and the test piece was produced.
<Measurement of reflectance before and after the rotation labeling test>
After performing the irradiation test described later on the prepared specimen and measuring the reflectance with a color difference meter, a rotation labeling test (normal tire: 30,000 rotations) is performed, and then the irradiation test and reflectance are again performed. Measurement was performed.
<Irradiation test>
After watering the specimens according to the examples and comparative examples, a 500 W infrared light was placed at a height of 30 cm from the surface of each specimen and irradiated, and the surface temperature after 120 minutes was adjusted to the thermoelectric power. Measured by pair.
<3.3 Test results>

Table 4 shows the test results. Regarding Comparative Example 4 and Comparative Example 5, the water retention material is scattered by the tire running test, and the effect of suppressing the decrease in the reflectance and the increase in temperature is small. The fine particle size porous member suppresses scattering of the water retaining material in the tire running test, so that the decrease in the reflectance is small and the effect of suppressing the temperature rise is, for example, as described above. Infrared irradiation test and 2. It showed the effect of suppressing the temperature rise to the extent that it was inferior to that of the examples in the water retention material overflow control test due to rainfall.

<4. Permeability test>
A permeability test was conducted using the materials and test methods shown below.
<4.1 Materials Used>
<Pavement material with water permeability and drainage>
As the pavement member having water permeability and drainage, those corresponding to the open grain size ascon in Table 1 were adopted.
<Water retention material>
As the water retention material, cement milk, mineral water retention material + cement corresponding to the cement in Table 1, that is, mineral water retention material solidified with cement, mineral water retention material or silica sand No. 8 was used.
<Porous particle porous member>
As the fine particle size porous member, one corresponding to the cement (M2.5) in Table 1 was adopted.
<4.2 Test method>
<Production of specimen>
The water-permeable / drainage pavement member described above is molded to 30 × 30 × 5 cm, and the side surfaces are sealed, and then a fine particle porous member is applied to the bottom surface of the pavement member to a thickness of 3 mm. Then, after filling the pavement member with a water retention material, a specimen was prepared by applying a fine particle size porous member to the upper surface with a thickness of 3 mm. In addition, as shown in Table 5, the types of specimens were 8 types in total: Examples 1 and 5 and Comparative Examples 3 and 6 to 10. Moreover, about the thing which does not describe the use material in a table | surface, the corresponding preparation process was abbreviate | omitted and the test piece was produced.
<In-situ permeability test>
After immersing the specimen in water for 24 hours and saturating the water retaining material with water, an in-situ permeability test (according to the Paving Test Method Handbook 1-1-3T "In-situ Permeability Test Method") Water was poured into the pavement. At that time, the amount of excess water flowing out from below the specimen was measured, and the outflow time per fixed amount of outflow, the ratio of the outflow amount to the amount of water injected, and the amount of permeation of the water retaining material were calculated.
<4.3 Test results>

Table 5 shows the test results. In Comparative Example 6, since cement milk does not have water retention, water does not penetrate into the specimen. In Comparative Example 3, since a solidifying material is used as a water retaining material, it takes time for water to penetrate below the specimen.
Regarding Comparative Example 7 and Comparative Example 8, since the fine particle size porous member layer is not provided at the bottom of the specimen, the water retaining material flows out downward together with water.
Regarding Comparative Example 9 and Comparative Example 10, since the aggregate diameter of the porous member provided at the bottom of the specimen is large (maximum diameter 5 mm), powder water retention materials such as silica sand No. 8 and mineral water retention material flow downward. It is easy.
And about Example 1 and Example 5, the outflow of a water retention material can be suppressed and only water can be moved below by forming a layer in the bottom face of a specimen using the fine aggregate which has a suitable diameter. . In other words, only water can be reduced to the base layer.

1 is a schematic external view of a water-retentive and moisture-permeable pavement according to an embodiment of the present invention. The typical structure explanatory view of the water retention and moisture permeability pavement concerning the embodiment. The figure which shows typically the circulation of the water which concerns on the same embodiment. Same as above.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... 1st water-permeable member layer 2 ... Water retention layer 21 ... Coarse aggregate 22 ... Water retention material 3 ... 2nd water-permeable member layer G ... Base layer OG ... Pavement member

Claims (11)

Laying on top of a water-permeable base layer,
A first water permeable member layer laid on top of the base layer;
A water retentive layer comprising a water retentive material laid on top of the first water permeable member layer;
A water permeable member layer laid on top of the water retentive layer, and the water retentive material is configured not to pass through the first water permeable member layer and the second water permeable member layer. Water-retaining and moisture-permeable pavement characterized by that. The water retention layer is constituted by a pavement member having the water retention material and coarse aggregate,
The water retention / moisture permeable pavement according to claim 1, wherein the water retention material is disposed in a gap between coarse aggregates in the pavement member. The water-retentive and moisture-permeable pavement according to claim 2, wherein the pavement member is an open-graded asphalt mixture comprising coarse aggregate having a particle size of 13 mm or less. The water retentive / moisture permeable pavement according to claim 2, wherein the pavement member is a water permeable cement concrete in which an aggregate having a particle size of 2.5 to 20 mm, cement and water are mixed. The water retention and moisture permeable pavement according to claim 2, 3 or 4, wherein the water retention material contains an inorganic powder. The water retention / moisture permeable pavement according to claim 2, wherein the water retention material includes a water retention polymer. The first water-permeable member layer and the second water-permeable member layer are fine-grained porous members having fine aggregate and having a maximum particle size of 2.5 mm or less. Claim | item 1, 2, 3, 4, 5 or 6. The water retentive and moisture permeable pavement according to claim 7, wherein the fine particle size porous member is a mixture of cement, asphalt or resin and the fine aggregate. The water retention / retention property according to claim 7 or 8, wherein the fine particle size porous member constituting the second water permeable member layer is a mixture of either cement or resin and the fine aggregate, and is exposed upward. Moisture permeable pavement. A construction method for laying a water retaining layer having a water retaining material on the upper layer of a water permeable base layer,
A first water permeable member layer laying step of laying a water permeable member layer configured so that the water retaining material cannot pass through the upper part of the base layer;
A water retention layer laying step of laying the water retention layer;
A water retentive / moisture permeable pavement construction method comprising a second water permeable member layer laying step for laying the water permeable member layer on the water retentive layer. The water retention layer is constituted by the water retention material and a pavement member having a coarse aggregate,
The water retention / permeation method according to claim 10, wherein the water retention layer laying step includes a pavement member laying step for laying the pavement member and a water retention material filling step for filling the gap between the coarse aggregates with the water retention material. Wet pavement construction method.

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