JP2003239207A - Water retentive pavement material, water retentive pavement structure, water retentive pavement block, water retentive pavement method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water retentive pavement material, a water retentive pavement structure, a water retentive pavement block, and a water retentive pavement method which have water permeability and water retentivity in common and are capable of releasing temperature increase and inexpensively and easily executing it for a water retentive pavement. <P>SOLUTION: A water permeable pavement material 14 made of aggregate 14a and a binder 14b is scattered around a water retentive pavement material 13, in which a water retention polymer having such a reversible temperature- dependant water absorptive and water desorbing characteristic that the water retentive material absorbs water to form a water retaining gel in a low temperature and desorbs water to shrink the water retaining gel in high temperature, is dispersed in a polyurethane foamed body to impart such a constitution that water like rainwater infiltrates inwards and is retained in the water retentive pavement material 13. When the temperature rises by sunshine, desorbed water from the water retentive gel is evaporated and deprives the gel of the evaporation heat to make it possible to cool the gel. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a water retention pavement material, a water retention pavement structure, a water retention pavement block, and a water retention pavement method.

[0002]

2. Description of the Related Art In recent years, the progress of urbanization has been remarkable. Generally, in urban areas, there are many concrete buildings, and plazas and roads are covered with concrete and asphalt. Therefore, they absorb solar heat during the daytime, and their surface temperature reaches as high as 60 to 70 ° C in summer, boosting the daytime temperature in urban areas. In addition, heat radiation from them continues at night, pushing up the nighttime temperature. This also contributes to the heat island phenomenon in which the temperature in urban areas is significantly higher than in surrounding areas. Thus, in today's urban areas, severe heat and high dry conditions have become chronic, creating serious environmental problems peculiar to urban areas.

Originally, in the natural environment, when the water permeated into the ground evaporates by the sun's heat, the heat of vaporization is taken away, so that the mechanism of suppressing an excessive temperature rise of the ground was functioning. Since it is paved with impermeable material, its function is hindered and the situation is exacerbated.

Further, rainwater is not absorbed from the road surface and flows into sewage, etc., and the balance of water circulation is disturbed.
With the progress of land desiccation and depletion of groundwater, agriculture, landscaping, and horticulture have also been hindered in the urban areas and their surrounding green areas.

Conventionally, in order to deal with such a problem,
Roads, sidewalks, plazas, etc. have been provided with permeable pavement, and some automatic irrigation devices have been used to replenish water to dry ground.

[0006]

However, the pavement having a water permeable function has the effect of infiltrating water into the dry ground to reduce the temperature rise and to mitigate the water circulation cycle to the underground. Since it cannot be kept near the surface of the earth, its effect is temporary, and there was a problem that the temperature could not be reduced much in the summer and other low rainfall seasons. Further, the automatic irrigation device and the like have a problem that the use and the installation place are limited because the equipment and the maintenance cost are high. Therefore, by improving the pavement structure that covers a large area of the city, mitigating the thermal environment and heat island phenomenon of the city, and eventually the global warming phenomenon,
There has been a strong demand for a refreshing pavement structure for roads and sidewalks that is friendly to people and the environment and that can contribute to the restoration of proper water circulation.

The present invention has been made in view of the above problems, and has both water permeability and water retention, can moderate temperature rise, and can be inexpensively and easily installed. It is an object of the present invention to provide a water retentive pavement material, a water retentive pavement structure, a water retentive pavement block, and a water retentive pavement method for carrying out water-resistant pavement.

[0008]

In order to solve the above-mentioned problems, in the invention described in claim 1, a porous substrate alone or an aggregate of porous substrates is provided inside a porous substrate provided with water-permeable voids. , Which absorbs water to become a water retention gel, drains the water retained in the water retention gel when the temperature rises, and is constituted by dispersing a water retention polymer having reversible water absorption and drainage characteristics Use pavement material. Therefore, such a water-retentive pavement material absorbs and retains water at low temperatures such as during rainfall, and gradually drains water from the water-retaining gel when the temperature rises due to solar radiation. The water finally evaporates and flows out through the voids of the porous substrate to the outside.

According to a second aspect of the invention, in the water-holding pavement material according to the first aspect, the porous substrate is made of a foam of thermoplastic synthetic resin. for that reason,
It becomes possible to disperse the water-retaining polymer with little bias and to include it.

According to a third aspect of the present invention, there is used a water retention pavement structure characterized in that the water retention pavement according to the first or second aspect is covered with a water permeable pavement material. Therefore, the water retention property can be imparted even in the pavement construction using the conventionally used water-permeable pavement material.

According to a fourth aspect of the invention, in the water retention pavement structure according to the third aspect, the water-permeable pavement material is composed of an aggregate and a binder using a fibrous resin. Therefore, since it is covered with a water-permeable pavement material using various aggregates, a water-holding pavement structure can be obtained in which the water permeability, strength, design, etc. can be easily changed. Here, the fibrous resin is a synthetic resin in which the resin and the fibers are kneaded in order to improve the dripping of the liquid synthetic resin and the variation in the strength and water permeability of the structure due to the non-uniformity of the binder.

According to a fifth aspect of the present invention, the water-holding pavement block is characterized in that the water-holding pavement material according to the first or second aspect is provided with a water-permeable pavement material around the water-holding pavement material. To use. Therefore, since the water-retentive pavement block that has already been made into a block shape is used, the construction is easy.

In the invention according to claim 6, the water-permeable pavement material is composed of an aggregate and a binder using a fiberized resin. . Therefore, since it is covered with a water-permeable pavement material using various aggregates, a water-holding pavement block can be obtained in which the water permeability, strength, design, etc. can be easily changed.

According to a seventh aspect of the invention, there is used a water retaining pavement method characterized in that the water retaining pavement according to the first aspect is laid on a roadbed, and the water permeable pavement is laid thereon. . Therefore, the water-holding pavement structure according to claim 3 can be formed.

In the invention described in claim 8, the water-retaining pavement material according to claim 1 and the water-permeable pavement material are kneaded, and these are laid on a roadbed to form a pavement underlayer. A water-retentive pavement method is used, which comprises laying a water-permeable pavement material to form a pavement surface layer. Therefore, the water-permeable pavement material can be partially continuous through the pavement lower layer and the pavement surface layer.

According to a ninth aspect of the present invention, the water-permeable pavement material is composed of an aggregate and a binder using a fibrous resin, and the water retention property according to the seventh or eighth aspect. Use the paving method. Therefore, since it is covered with a water-permeable pavement material using various aggregates, water permeability, strength,
It is possible to form a water-retentive pavement structure whose design can be easily changed.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings. Throughout all the drawings, the same or corresponding members are designated by the same reference numerals. FIG. 1 is a perspective partial cross-sectional view showing a state of road pavement using a water retention pavement block according to the present invention. FIG. 2 is a cross-sectional view in the thickness direction of the water retention pavement block according to the present invention.

In FIG. 1, a roadway portion 8 is formed by a well-known asphalt pavement construction, and the present invention is applied to a sidewalk portion 7. The cross-sectional structure is such that a filter layer 2 made of sand or the like is spread on a roadbed 3, an asphalt pavement 5 is laid on the roadway part 8, and a sidewalk part 7 is a water-retentive pavement instead of the asphalt pavement 5. It has a structure in which the body 1 is laid. The water retention pavement 1 is specifically configured by laying the water retention pavement block 11 according to the present invention. As will be described later, the water retention pavement 1 can also be configured by the water retention pavement structure according to the present invention. It is the drainage block 4 that separates the sidewalk part 7 and the roadway part 8. Reference numeral 6 is a tree such as a roadside tree.

The water retention pavement block 11 according to the present invention is
Generally, it is a molded block composed of a water-permeable portion and a water-retaining portion, and has various configurations as described below. 2 and 3 are sectional views in the thickness direction showing an example thereof.

First, the detailed structure of the water retention pavement material 13 commonly used for the water retention structure and the water retention pavement block according to the present invention will be described. The water-retentive pavement material 13 is obtained by dispersing and containing a water-retentive polymer that absorbs water and retains water so that it can be drained, in a polyurethane foam (porous substrate) having water resistance. It is manufactured by mixing a water-retaining polymer with the raw material liquid before foaming of the body and then foaming. The foamed state is adjusted so as to be a soft polyurethane foam which is mostly composed of open cells (voids), and it is possible to absorb and permeate water into the polyurethane foam.

The water-retaining polymer is, for example, an alkali metal salt of a polyelectrolyte such as polyacrylic acid, methacrylic acid or 2-methacryloylethanesulfonic acid, or a copolymer of polyacrylamide and acrylamide or 2-hydroxyethylmethacrylate. It is a mixture containing a polymerized and crosslinked polymer of alkyl acrylamide as a main component. Its shape is 1
Those crystallized to have a size of mm or less can be used.
Alternatively, it may be appropriately processed into an amorphous powder having the same size, a spherical particle, a flaky shape, or the like. By setting the size to this extent, the polyurethane foaming raw material liquid is relatively uniformly dispersed, and the deviation of the position after foaming is reduced. However, it goes without saying that a fibrous shape may be used as long as the positional deviation does not cause a problem.

The water-retaining polymer consisting of the above main components absorbs water at low temperature to become a water-retaining gel, and at high temperature, drains (water-emits) water to shrink the water-retaining gel. It has water absorption and drainage characteristics. In general, when the temperature exceeds a certain temperature, the amount of drainage gradually increases, and then the amount of drainage suddenly increases. At a certain temperature, almost no water is absorbed, and drainage actually occurs within a certain temperature range.

When the representative temperature at which the above-mentioned steep increase in the amount of waste water is turned is called the water-releasing temperature, the water-releasing temperature is unique to the material of the water-retaining polymer and changes depending on the blending ratio of the water-retaining polymer having different water-releasing temperatures. By doing so, it is possible to change the drainage increase characteristic. Since the relationship between the water retention amount and the swelling volume is known for each main component, it is easy to predict the volume after swelling based on the blending ratio of the main components.

As a result of the accumulation of various experiments, the inventor has, for example, 10 to 100 g of the above water-retaining polymer,
By dispersing and mixing in 1000 ml of polyurethane resin unfoamed liquid, the water retention capacity is 9% of the polyurethane foam volume.
The water retention pavement material 13 reaching 0% or more could be manufactured. That is, even if the water was retained to the maximum extent, the volume of the water retaining pavement material 13 before water retention was the same as that of the water retentive pavement material 13.

Further, the water-retentive pavement material 13 is a polyurethane foam in which a water-retaining polymer is dispersed,
In the same way as in the case of pure polyurethane foam, the internal porosity mainly determined by the expansion ratio and elastic properties can be adjusted, and the shape can be, for example, mat, block, chip, or granular. It can be formed into various shapes. It is also easy to cut into various shapes after forming the mat shape or the block shape.

Further, for example, it is possible to heat-press them and reprocess them into a block shape to make the water-retentive paving material 13 into an aggregate of polyurethane foams (aggregate of porous substrates). In this case, the voids included in the water retention pavement material 13 are the sum of the voids inside each polyurethane foam chip and the voids generated between each chip.

It should be noted that the polyurethane foam can be recycled as a waste material, and the above-described structure has an advantage that it can be easily realized with a recycled material.

Next, the water permeable pavement material 14 commonly used for the water retention structure and the water retention pavement block according to the present invention will be described. The water-permeable pavement material 14 according to the present invention is roughly
The aggregate 14a is fixed with a binder 14b to form a water permeable void 16.

As the aggregate 14a, for example, gravel, crushed stone, shell, glass cullet, molten slag, etc., or a mixture thereof can be adopted.

The binder 14b binds the aggregate 14a with a relatively uniform strength without dripping and forms a proper water-permeable gap between the aggregates 14a. As a main agent, epoxy resin of alicyclic diol diglycidyl ether 1000 g, ceramic wool 15 to 50 g, glass wool 50 to 20
0g, quartz filament 100-200g and thickener 10
˜60 g in the proportions shown above, and liquid-modified alicyclic polyamine 450-500 g as a curing agent
It is possible to employ a mixture obtained by adding and kneading.

For example, the binder 14b and the aggregate 14
a (for example, 4 to 6 mm commercial product Kinka gravel 35 to 40 k
g) is kneaded at room temperature and mixed evenly, then put in a mold at 60 ° C.
By performing curing for 2 to 3 hours to solidify, a weather resistant water-permeable pavement material 14 having a porosity of 20 to 35%, a bending strength of 8 N / mm ² or more and a compression strength of 20 N / mm ² or more can be obtained.

As shown in FIG. 2, one embodiment of the water-retentive pavement block 11 according to the present invention has a block-shaped water-retainable pavement material 13 arranged inside and an aggregate 14a around it. A water-permeable pavement material 14 composed of a binder 14b and a binder 14b is arranged to form a block. For example, the size and thickness of the block 20
It has a rectangular parallelepiped shape of × 10 × 6 cm, the water-retentive pavement material 13 has a thickness of about 2 cm, and the water-permeable pavement material 14 has a layer thickness of 2 cm.
Something can be adopted. not to mention,
The size and thickness of each are water retention, water permeable pavement material 14
The strength of the water-permeable pavement material 14 can be adjusted by the size and type of the aggregate 14a and the composition of the binder 14b.

Next, the water retention pavement block 1 according to the present invention.
The action of 1 will be described. Since the water retentive pavement block 11 has its outer periphery covered with the water permeable pavement material 14,
When laid on the filter layer 2 as described above, moisture such as rainwater that falls on the sidewalk portion 7 permeates and descends through the voids 16 of the water permeable pavement material 14. In the region where only the water-permeable pavement material 14 exists in the thickness direction, moisture penetrates underground through the filter layer 2 and the roadbed 3, and a part of the water is retained in the ground.
Or join the flow of groundwater. On the other hand, above the water-retaining pavement material 13, moisture penetrates into the voids formed by the open cells of the polyurethane foam of the water-retaining pavement material 13 and infiltrates the entire water-retaining pavement material 13 by the capillary phenomenon.

When the water content comes into contact with the water-retaining polymer dispersed in the water-retaining pavement material 13, the water-retaining polymer is taken up to form a water-retaining gel. When the water is continuously supplied, the water-retaining gel further swells and spreads in the voids of the polyurethane foam. Since the polyurethane foam is soft, a certain amount of swelling is absorbed inside due to the polyurethane resin elastically deforming and bending or stretching. Since the water-retaining polymer is arranged so that the swelling volume falls within the voids of the polyurethane foam, the water-retaining paving material 13 can swell the water-retaining gel without changing the apparent volume. . Therefore, the water-retentive pavement material 13 expands from the initial volume and applies an internal pressure load to the water-permeable pavement material 14 surrounding the water-retentive pavement material 13. As a result, the pavement surface swells or the water-permeable pavement material 14 is cracked. Can be prevented.

When the polyurethane foam is not used as a single body but as an aggregate, voids may occur between the single bodies, and the voids may become larger than the total of the voids of the single bodies. In this case, since the volume of the whole aggregate does not change even if it swells up to the range of the voids, it goes without saying that the same effect as above can be obtained even if the polyurethane foam alone expands beyond the initial volume.

In this way, in the water-retaining state, the water is not drained until the temperature rises to some extent. However, the temperature of the pavement surface rises due to sunlight, and the water-retentive pavement material 13
When the temperature rises, the water retention gel gradually contracts and drainage occurs. At this time, the drained water initially stays in the water-retaining pavement material 13 due to the capillary phenomenon, but when heat is supplied from the surroundings, the heat of vaporization is gradually taken away to evaporate, and the voids 16 of the water-permeable pavement material 14 are evaporated. And then rises, and in this process, it also escapes into the atmosphere while drawing heat from the aggregate 14a. By such a process, the water retention pavement block 11 is cooled as the drainage proceeds.

When the water retention pavement block 11 is cooled, the amount of drainage water from the water retention pavement material 13 also decreases, so the equilibrium temperature is reached while repeating these steps, and as a result, the water retention pavement block 11 is not water-retained at all. Compared with the case, the temperature of the pavement surface can be significantly reduced.

Examples of experimental results for verifying this action are shown in FIGS. The experimental sample is a water-retentive pavement block (hereinafter, also abbreviated as water-retentive pavement), which is a water-retentive pavement block according to the present invention having the above-mentioned configuration and dimensions.
Prepared by adjusting the water absorption and drainage characteristics such that the drainage starts from about 28 ℃ and the drainage gradually increases, and the actual road is used as a control sample representing general pavement (hereinafter also referred to as general pavement). Asphalt pavement used for paving was prepared as blocks of the same shape.

In the experiment, a constant temperature bath set to a predetermined temperature was prepared, and a sample sample of a water-holding pavement block which had been sufficiently hydrated in advance, a control sample and the sample were placed therein, and the surface temperature thereof was measured.

FIG. 3 is a graph showing the experimental results when the constant temperature bath temperature was set to 44 ° C. The horizontal axis shows the observation time in hours and minutes, and the vertical axis shows the surface temperature in ° C. Note that the horizontal axis and the vertical axis are common to all the following graphs, and the display ranges are simply different, so the description will not be repeated below. The polygonal line 20 shows the change in the surface temperature of the general pavement, and the polygonal line 21 shows the change in the surface temperature of the water-retentive pavement.

In all cases, the temperature was raised from the initial temperature of 28 ° C. for 70 minutes, and then almost reached the equilibrium temperature. At all observation times, the surface temperature of the water-retentive pavement was lower than that of general pavement, and a difference of 5 ° C occurred at the equilibrium temperature.

In FIG. 4, subsequently, the temperature of the constant temperature bath is 56 ° C.
It is a graph which shows the result of experiment set to. The polygonal line 22 is the result of general pavement, and the polygonal line 23 is the result of water-retentive pavement. Equilibrium is reached after about 100 minutes. At all observation times, the surface temperature of the water-retentive pavement was lower than the surface temperature of the general pavement, and a difference of 10 ° C occurred at the equilibrium temperature.

In FIG. 5, subsequently, the temperature of the constant temperature bath is set to 66 ° C.
It is a graph which shows the result of experiment set to. The polygonal line 24 is a result of general pavement, and the polygonal line 25 is a result of water retention pavement. Equilibrium is reached after about 80 minutes. At all observation times, the surface temperature of the water-retentive pavement was lower than that of general pavement, and a difference of 12 ° C occurred at the equilibrium temperature.

FIG. 6 shows that the temperature of the constant temperature bath is 74 ° C.
It is a graph which shows the result of experiment set to. The polygonal line 26 is the result of general pavement, and the polygonal line 27 is the result of water-retentive pavement. Equilibrium is reached after about 100 minutes. At all observation times, the surface temperature of the water-retentive pavement was lower than the surface temperature of the general pavement, and a difference of 15 ° C occurred at the equilibrium temperature.

As shown by the above experimental results, the water retention pavement block according to the present invention has a temperature reducing action which is not found in asphalt pavement, and the higher the temperature is, the higher the temperature reducing effect is. Road surface temperature of 60 to 7
Even in the range of 0 ° C, a very high temperature reducing effect is exhibited. Moreover, the effect is lasting.

Further, since the water-holding pavement block 11 is formed into a block, it has an advantage that it can be easily laid and constructed. Further, since the block is covered with the water-permeable pavement material 14 having high strength, there is an advantage that the water-holding pavement material 13 having low strength can be adopted.

Next, a modified example of the water retention pavement block 11 will be described. FIG. 7 shows a modified example of the water-retaining pavement block 11 according to the present invention, in which the water-retaining pavement material 13 in the form of chips or the like is used as the water-permeable pavement material 14 composed of an aggregate 14a and a binder 14b. It is provided dispersed inside, and has a block shape so that the outer peripheral surface is surrounded by the water-permeable pavement material 14.

Even in such a structure, each water-holding pavement material 13 exhibits the same operation and effect as described above. Furthermore, since each of them is divided into small pieces, heat is exchanged quickly, the sensitivity to ambient temperature is high, and the drainage surface area is larger than that of the block-shaped water retaining pavement material 13. Therefore, it takes time to reach the equilibrium temperature. Has the advantage of being shortened. Further, since the water retention pavement material 13 is chip-shaped, it is not necessary to prepare various sizes of water retention pavement blocks 11 in advance depending on the size of the water retention pavement block 11 to be manufactured. There are advantages.

Next, an embodiment in which the water retention pavement 1 (FIG. 1) has a water retention structure according to the present invention will be described. Figure 8
Shown in is a sectional view showing the embodiment. On the water-retentive paving material 13 formed into a mat shape, the aggregate 14
The water-permeable structure 12 including a and a binder 14b is provided in an overlapping manner. Each material is the same as that described above.

To provide this water-retaining pavement structure, first,
On the filter layer 2, for example, a water-retentive paving material 13 formed into a mat shape having a thickness of about 2 cm is spread, and then a water-permeable paving material 14 in which an aggregate 14a and a binder 14b are kneaded at room temperature is provided. For example, it is possible to form a water-permeable structure 12 by laying it down to about 2 cm and curing it for about one day to solidify it.

In this case, the water permeating through the water permeable structure 12 is retained in the water retentive pavement material 13, and when the temperature rises, it is drained to reduce the temperature of the pavement surface. Is the same as. Since the water retention pavement material 13 is laid on the entire lower surface of the water permeable structure 12, there is an advantage that the water retention efficiency is good. Further, since the water-permeable structure 12 is integral, the load from the pavement surface is dispersed and transmitted to the water-retaining pavement material 13, so that even if the water-retaining pavement material 13 has a relatively low strength, it is a local portion of the pavement surface. There is an advantage that it is difficult to cause a dent.

Further, in this structure, even if the water-permeable pavement is already applied, only the water-retaining pavement material 13 is laid under the water-permeable pavement, so that the construction is easy and the appearance of the existing water-permeable pavement is changed. There is an advantage that improvement can be performed without

Further, a cross-sectional structure similar to that of the water retention pavement block 11 shown in FIGS. 2 and 7 can be adopted as the water retention pavement structure.

In order to form the cross-sectional structure as shown in FIG. 2, first, a water-permeable pavement material 14 prepared by kneading the aggregate 14a and the binder 14b at room temperature is prepared, laid on the filter layer 2, and then the filter layer 2 is placed thereon. In addition, the water-repellent pavement material 13 which is appropriately divided into blocks is arranged at appropriate intervals, and the water-permeable pavement material 14 is laid on the water-repellent pavement material 13 to cover the surface and harden for about one day to solidify. Let Although each thickness can be set arbitrarily, for example, each thickness can be about 2 cm.

In order to form the cross-sectional structure as shown in FIG. 7, first, a water-permeable pavement material 14 prepared by kneading the aggregate 14a and the binder 14b at room temperature is prepared and laid on the filter layer 2. On top of that, the water-permeable pavement material 13 in the form of chips or the like is mixed with the water-permeable pavement material 14 and spread.
Further, a water-permeable pavement material 14 is laid on top of it to cover the surface, and cured for about one day to solidify. Although each thickness can be set arbitrarily, for example, the water-permeable pavement material 14
The water retentive pavement material 13 can be dispersed in a thickness of about 2 cm and about 500 g / m ² .

In this case, in order to mix the water-repellent pavement material 13 that has been shredded into the water-permeable pavement material 14, the water-retention pavement material 13 and the water-permeable pavement material 14 are alternately laid in the construction process to keep the water retention property. The pavement material 13 may be dispersed hierarchically.

According to the water retention pavement structure described above,
Since the water-permeable pavement material 14 is partially continuous in the thickness direction of the water-holding pavement 1, the load from the pavement surface can be dispersed in the surface direction, and the part of the water-permeable pavement material 14 that is continuous in the thickness direction. Since the load is transmitted downward by, the strength of the water retaining pavement 1 depends on the water permeable pavement material 14,
There is an advantage that high strength can be provided regardless of the strength of the water retention pavement material 13.

As an advantage common to both the water-retaining pavement block and the water-retaining pavement structure, since the water-retaining pavement material 13 is covered with the water-permeable pavement material 14, the water-retention pavement material 13 is used.
Since it is not directly exposed to UV light, it has the advantage that long-term performance can be maintained and the cost for weather-resistant processing can be reduced without imparting weather resistance to the water-retaining polymer or porous substrate. .

In the above description, the water retention pavement material 13
Although the porous substrate of No. 1 has been described as a polyurethane foam, other materials can be used as long as it has water resistance and water-permeable voids. For example, a foam made of a thermoplastic synthetic resin such as polypropylene resin, polyethylene resin, vinyl chloride resin, or polybutene resin can be used.

Further, the porous substrate is not limited to a foam, and may be, for example, a fibrous material that is permeable to water.

In the above description, the water-permeable pavement material 14 is used.
As an example, a combination of an aggregate 14a and a binder 14b using a fibrous resin is given, and only an example thereof is described, but as long as it can be used for pavement and has water permeability, it is limited to this is not.

Further, the fibrous resin is not limited to the above-mentioned examples, and any material may be used as long as it is bonded so as to form a proper water-permeable void between the aggregates 14a. However, it is more effective to use a weather resistant fibrous resin having weather resistance that does not cause yellowing, loss of gloss, and deterioration of bond strength due to the influence of water even after 6 months have passed since installation. For example, all the binders made of various resins, fibers, water-resistant peeling preventives, etc. disclosed in JP 2001-164096 A can be adopted. Such a weather resistant fibrous resin is not limited to the above epoxy resin, and an acrylic resin or a urethane resin can be adopted.

That is, an alicyclic epoxy resin having an aromatic benzene ring substituted by a reduction reaction and ceramic wool, glass wool, metal fiber, carbon fiber or polymer material having a fiber diameter of 100 μm or less and a fiber length of 1 mm or less. A weather-resistant epoxy-based fiberized resin characterized by having a kneaded material with fibers as a main component can be adopted. Further, an alicyclic epoxy resin having an aromatic benzene ring substituted by a reduction reaction,
The main component is a kneaded material of ceramic wool, glass wool, metal fiber, carbon fiber or polymer material having a fiber diameter of 100 micron or less and a fiber length of 1 mm or less, and a water-resistant peeling-preventing agent was added and kneaded thereto. The characteristic weather- and water-resistant epoxy fiberized resin can be used. In addition to the above weather-resistant and water-resistant epoxy fiberized resin, a silane coupling agent, an organotitanium coupling agent, an organic phosphate coupling agent or a chromium complex coupling agent as a water-resistant peeling preventive agent. You may add. Furthermore, a weather resistance / yellowing-resistant curing agent and / or a curing control catalyst, which is composed of a compound containing no aromatic benzene ring, may be added to the above.

As the alicyclic epoxy resin in which the aromatic benzene ring is substituted by the reduction reaction, specifically, an epoxy resin containing an alicyclic diol diglycidyl ether as a main component can be adopted. . Examples of the silane-based water-resistant peeling preventive agent include N-β- (aminoethyl) -γ-aminopropyltrimethoxysilane,
γ-aminopropyltriethoxysilane, γ-glycidoxypropyltrimethoxysilane, β- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, γ-
Methacryloxypropyltrimethoxysilane, vinyl-
Tris- (β-methoxyethoxy) silane or the like can be adopted.

Further, it is also possible to employ a binder constituted by substituting the epoxy resin disclosed in the above publication with an acrylic resin or a urethane resin as it is or with appropriate known modifications.

In the above description, the effect was verified with the sample sample in which the water retention temperature of the water retention pavement material was kept constant. However, water retention polymers having different water retention temperatures were dispersed in a single porous substrate. It goes without saying that the water-retentive pavement material may be manufactured by forming an aggregate from a single porous substrate in which water-retaining polymers having different water-emission temperatures are dispersed. In that case, moisture can be efficiently used by blending a small amount of water having a relatively low water temperature and a large amount of water having a relatively high water temperature. In other words, if water is generated all at once at a constant temperature, water will continue to be generated even if it exceeds the water required for cooling, and excess water will condense without vaporizing and will eventually flow out downward and permeate into the roadbed 3 and be lost. However, if the above adjustment is made, such useless outflow can be mitigated, so that there is an advantage that the retained water can be retained for a long period of time.

Further, the water-retentive pavement material may be constructed so that the water-releasing temperature changes in layers, such that the water-releasing temperature is high on the inside side and the low water-releasing temperature is on the outer side. . In this case, since the temperature of the inner side is lowered while the outer side is draining, there is an advantage that the drainage is not promoted at a partly high temperature and the water is not lost quickly. In addition, considering that a temperature distribution normally occurs from the pavement surface toward the roadbed 3, the water temperature distribution of the water retaining pavement material is configured to be from low temperature to high temperature from the upper side to the lower side of the pavement side. The same effect can be obtained even if the water is hierarchically retained.

In the above description, the water retention pavement block 11 has been described as a rectangular parallelepiped block, but the size and shape are not limited to those described above as long as the pavement surface can be covered. Needless to say.

In the above description, an example of forming the water-retaining pavement 1 for the sidewalk 7 has been described, but it goes without saying that the present invention is not limited to pavement for sidewalks. For example, it can be applied to various places such as a roadway, a plaza, a rooftop of a building, an orchard garden, a garden, and a parking lot. In particular, when a plant is placed in or around the tree 6 (Fig. 1), not only the effect of reducing the temperature but also the irrigation action to the ground can be exerted, which is very convenient, and is very convenient. It can also contribute to the promotion of greening.

[0070]

As described above, in the invention described in claim 1, the water-retentive pavement material absorbs and retains water at a low temperature such as during rainfall, and when the temperature rises due to solar radiation, Drain slowly from the water retention gel. Since the moisture finally evaporates and flows out through the voids of the porous substrate to the outside, there is an effect that the temperature of the water retentive pavement is reduced by the heat of vaporization taken in the process.

According to the second aspect of the present invention, since it is possible to disperse and contain the water-retaining polymer with less unevenness, the pores of the porous substrate are evenly distributed per one water-retaining polymer, resulting in water absorption. With this, it is possible to effectively retain water.

According to the third aspect of the present invention, since water retention can be imparted even in the pavement construction using the water-permeable pavement material that has been conventionally used, the construction is extremely easy, and the existing water-permeable pavement is used. There is an effect that the temperature can be easily reduced.

In the invention according to claim 4, since a water-retentive pavement structure capable of easily changing the amount of water permeation, strength, design and the like can be provided, the water-retaining pavement structure can be easily applied to a wide range of pavement applications. The effect that it can respond is produced.

In the invention described in claim 5, since the water-retentive pavement block which has already been made into a block shape is used, there is an effect that the construction becomes easy and the construction period and construction cost can be reduced. Further, it is possible to easily replace the existing block pavement with the water retention pavement.

According to the sixth aspect of the invention, it is possible to easily change the water permeability, strength, design, etc., and it is possible to meet a wide range of pavement applications while maintaining water retention, and it has a block shape. Since the water-retentive pavement block is used, the construction becomes easy, and the construction period and construction cost can be reduced.

In the invention described in claim 7, since the water-holding pavement structure according to claim 3 can be formed, the same effect as in claim 3 can be obtained.

According to the eighth aspect of the invention, since the water-permeable pavement material can be partially continuous through the pavement lower layer and the pavement surface layer, the pavement surface load is applied through the water-permeable pavement material. Since it can be transmitted to the roadbed, there is an effect that a low-strength water retaining pavement material can be used.

In the invention described in claim 9, since it is possible to form a water-holding pavement structure capable of easily changing the amount of water permeation, strength, design, etc., it is possible to meet a wide range of pavement applications while having water-holding properties. There is an effect that can be.

[Brief description of drawings]

FIG. 1 is a perspective partial sectional view showing a state of road pavement using a water retentive pavement block according to the present invention.

FIG. 2 is a cross-sectional view in the thickness direction of the water retention pavement block according to the present invention.

FIG. 3 is a graph of a first experimental result showing the effect of reducing the surface temperature of the water retention pavement block according to the present invention.

FIG. 4 is a graph of a second experimental result under the same temperature conditions.

FIG. 5 is a graph of a third experimental result under the same temperature conditions.

FIG. 6 is a graph showing the results of a fourth experiment under the same temperature conditions.

FIG. 7 is a cross-sectional view showing a modified example of the water retention pavement block according to the present invention.

FIG. 8 is a cross-sectional view showing an embodiment of a water retention pavement structure according to the present invention.

[Explanation of symbols]

1 Water-retentive pavement 2 filter layers 3 roadbed 4 drainage block 5 asphalt pavement 6 trees 7 sidewalks 8 driveway 11 Water-Retentive Pavement Block 12 Water-permeable structure 13 Water-Retentive Pavement Material 14 Water-permeable pavement material 14a Aggregate 14b binder 16 voids 20-27 line

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hidemasa Otsu             2-9-3 Shiba Park, Minato-ku, Tokyo Century East             Within Kyuko Industrial Co., Ltd. F term (reference) 2D051 AA01 AA02 AB03 AC11 AE04                       AF01 AG11 AG12 AG13 AH01                       AH02 DA11 DB01 DB03

Claims (9)

[Claims] 1. A porous substrate alone or an aggregate of porous substrates having water-permeable pores absorbs water to form a water-retaining gel, and the water retained in the water-retaining gel when the temperature rises. A water-retentive paving material, characterized in that a water-retainable polymer having a reversible water absorption / drainage characteristic that drains water is dispersed. 2. The water-retentive pavement material according to claim 1, wherein the porous substrate is made of a foam of thermoplastic synthetic resin. 3. A water-retentive pavement structure, wherein the water-retentive pavement material according to claim 1 or 2 is covered with a water-permeable pavement material. 4. The water-retentive pavement structure according to claim 3, wherein the water-permeable pavement material is composed of an aggregate and a binder using a fibrous resin. 5. A water-retentive pavement block, wherein a water-permeable pavement material is arranged around the water-retentive pavement material according to claim 1 or 2, and the block is constructed. 6. The water retentive pavement block according to claim 5, wherein the water permeable pavement material is composed of an aggregate and a binder using a fibrous resin. 7. A water retaining pavement method comprising laying the water retaining pavement according to claim 1 on a roadbed and laying a water permeable pavement on the water retaining pavement. 8. The water-retentive pavement material according to claim 1 and the water-permeable pavement material are kneaded and laid on a roadbed to form a pavement underlayer, and the water-permeable pavement material is laid thereon. A water-retaining pavement method, which comprises forming a pavement surface layer with 9. The water retention pavement method according to claim 7, wherein the water permeable pavement material is composed of an aggregate and a binder using a fibrous resin.