JP2001303504A - Forming method for water holding pavement body and water holding pavement body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve such problems that the conventional water retaining pavement body has a low water absorption coefficient, a continued pavement body cannot be obtained, the conventional water retaining pavement body is hard to be applied to a roadway pavement body although it can be utilized as a footpath pavement body, and the conventional water retaining pavement body has a problem in strength. SOLUTION: A slurry filler 4 that cement and a porous filler are mixed together is injected into the voids of molded porous concrete, or a binder 5 that the porous filler is dispersed in cement into a mortar shape is added to an aggregate 2 and mixed to provide the water holding pavement body 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a water-retentive pavement and a water-retentive pavement which suppresses a rise in road surface temperature by filling fine voids with a substance having a high water-retention property.

[0002]

2. Description of the Related Art In recent years, in urban areas, most of the ground surface is covered with artificial structures such as buildings or paved roads, which absorb solar energy during the day and are heated to raise the environmental temperature, so-called heat island. The phenomenon is a problem.

Conventionally, as a countermeasure, a fine mineral powder (silt material) has been mixed in a cement paste containing a large amount of excess water as an injection grout for a semi-flexible pavement using a ceramic tile or a ceramic block having a water retention property. By using the thing, the injection material is cured and dried, so that a fine void is obtained in a place where moisture was present, a micro continuous void is generated in a pavement body and the like in the continuous void when raining or the like. It is intended to suppress the rise in surface temperature of the pavement by retaining the water and moving the water retained in the pavement to the surface of the pavement by capillary action, and evaporating the water on the surface of the pavement. .

Further, the applicant of the present invention has disclosed in Japanese Patent Application No. 10-283.
As shown in No. 09, silty and clayey soils
By processing into a particle size of 74 to 2.00 mm, a so-called sand particle size, and filling into voids of a pavement having macro continuous voids such as a water-permeable pavement and a drainage pavement, it has an appropriate water permeability. Moisture such as rainfall is quickly taken into the pavement, and by utilizing the rise in the capillaries in the gaps between the sands, the water retained in the gaps in the pavement or the gaps between the sands is moved to the pavement surface, thereby suppressing the rise in the surface temperature of the pavement. Pavement, etc.

[0005]

However, a pavement using a ceramic tile or a ceramic block cannot be used as a pavement for a sidewalk because a continuous pavement cannot be obtained. Has a problem that it is difficult to apply. Further, in a pavement hardened by making the moisture of the cement paste excessive, micro continuous voids are generated in the structure of the pavement, and there is a problem in its strength.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a continuous pavement without lowering the water retention capacity and the effect of suppressing the temperature rise, and to improve the strength of cement paste. To provide a water-retentive pavement forming method and a water-retentive pavement that can withstand a roadway.

[0007]

According to a first aspect of the present invention, there is provided a method for forming a water-retentive pavement, comprising forming a porous concrete, and mixing a cement and a porous filler in the voids of the porous concrete molded body. It is characterized by injecting a filler.

A water-retentive pavement according to a second aspect of the present invention is characterized in that a slurry-like filler obtained by mixing cement and a porous filler is injected into the voids of the formed porous concrete.

According to the first and second inventions, a slurry filler is prepared by mixing cement and a porous filler having a very high water absorption, and the slurry filler is molded into a porous concrete. The method of forming a high-strength water-retentive pavement and a water-retentive pavement that can be used for roadways can be suppressed by improving the water-retaining capacity because the water-retaining ability is improved. Can be provided. Furthermore, by using the water-retentive pavement according to the present invention, it is possible to suppress a rise in the road surface temperature in summer and reduce the heat island phenomenon in urban areas.

In the water-retentive pavement according to a third aspect of the present invention, the concrete is permeable asphalt concrete having a porosity of 15% to 30%, and the slurry-like filler is:
The weight ratio of the cement and the porous filler is such that the porous filler is 25 parts to 65 parts with respect to 100 parts of the cement, and the viscosity is adjusted for 9 seconds to 15 seconds in a P funnel test. And

To improve the water absorption, it is preferable to add more porous filler, but excessive addition has a problem in strength. Therefore, in the third invention, the flexural strength and the compressive strength are ensured by setting the weight ratio of the porous filler as the filler to 65 parts or less with respect to 100 parts of the cement. The water-absorbing function was ensured by setting the weight ratio of the porous filler as the filler to 25 parts or more with respect to 100 parts of the cement.
Similarly, to ensure the strength, the porosity of the permeable asphalt concrete is 30% or less, the viscosity is 15 seconds or less in the P-Rot test, and the porosity of the permeable asphalt concrete is 15% or more to ensure the water absorption function. Since the time is set to be 9 seconds or more in the P funnel test, it is possible to provide a highly water-retentive pavement having high water retention capacity and high strength that can be used for roadways.

A method of forming a water-retentive pavement according to a fourth aspect of the present invention is to provide a method of forming a mortar-like fastening material by dispersing a porous filler in cement, mixing the aggregate with the aggregate, and mixing the aggregate with the fastening material. Is laid on the ground.

The water-retentive pavement according to the fifth invention is characterized in that a mortar-like fastening material obtained by dispersing a porous filler in cement is added to the aggregate and mixed.

In the fourth and fifth inventions, a porous filler having a very high water absorption is used not as a filler but as a fastening material, so that cement mortar, cement concrete and water-permeable cement concrete are used. The present invention can also be applied to a method for forming a water-retentive pavement and a water-retentive pavement.

In the water-retentive pavement according to a sixth aspect of the present invention, the fastening agent may be such that the weight ratio of the cement to the porous filler is such that the porous filler is 1 to 100 parts of the cement.
5 to 25 parts.

To improve the water absorption, it is preferable to add more porous fillers, but excessive addition has a problem in strength. Therefore, in the sixth invention, in order to secure bending strength and compressive strength, a porous filler as a fastening material is added in a weight ratio of 25 to 100 parts of cement.
Or less. In addition, in order to ensure the water absorption function, since the porous filler as a fastening material is 15 parts or more by weight to 100 parts of cement,
It is possible to provide a water-retentive pavement having high water-retention ability and high strength that can be used for roadways.

The water-retentive pavement according to a seventh aspect of the present invention is characterized in that the porous filler has a water absorption of 100% or more and a particle size of 1 μm to 5 μm.

According to the seventh aspect of the invention, as the filler and the fastening agent, a particle having a particle diameter of 1 μm, which is classified into clay having a smaller diameter than sand (particle diameter: 75 μm to 2 mm) and silt material (particle diameter: 5 μm to 75 μm). A porous filler having a size of 5 μm or more is used. Since the porous filler has a very high water absorption of 100% or more, it is possible to provide a water-retentive pavement having a high water-retention ability.

The water-retentive pavement according to the eighth invention is characterized in that the cement is a foamed cement.

In the eighth invention, a foamed cement obtained by adding a foaming material to cement is used. Foamed cement has more fine voids than ordinary cement (early-strength cement), and therefore has high water retention. Therefore, it is possible to provide a water-retentive pavement having even higher water retention in combination with the water retention ability of the porous filler.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings showing the embodiments.

Embodiment 1 FIG. 1 is a schematic sectional view showing a structure of a water-retentive pavement 1 using a porous filler (not shown) as a filler 4. In the figure, reference numeral 1 denotes a water-retentive pavement according to the present invention. The water-retentive pavement 1 is composed of aggregates 2 such as gravel joined by asphalt 3. Fillers 4 in which a porous filler is dispersed in cement to form a slurry are injected into the gaps between the aggregates 2, 2,....

The porous filler and sepiolite, diatomaceous earth or aragonite needle columnar sea urchin-like or MARIMO shape having a porous calcium carbonate 10 ^-10 primary particles of calcium carbonate is three-dimensionally irregularly intertwined m to several hundred 10
^A mineral called an adsorptive filler having a high water absorption rate and having a myriad of ^-10 m pores. Normally, the porous filler has a water absorption of more than 100%. However, even if the water absorption is high, a material such as silica gel, which does not release water unless a temperature of 100 ° C. or higher is applied, can obtain good water evaporation. Not preferred. Further, a volume change due to water absorption, for example, bentonite, is not preferable because it causes a decrease in strength.

Table 1 shows the types and properties of the porous fillers used in this test.

[0025]

[Table 1]

As shown in Table 1, those having a water absorption exceeding 100% are Filler C and Filler D.

Sample Nos. 1 to N used for semi-flexible pavement
o4, the bending strength, compressive strength,
Maximum water absorption and 5 cm siphoning time were detected. The results are as shown in Table 2.

[0028]

[Table 2]

As apparent from Table 2, No. 3 was the most 5c.
m It was confirmed that the siphoning time was short and the reduction in bending strength and compressive strength could be suppressed to a small extent. But,
With the fibrous filler D having a high water absorption, the curing of the cement was insufficient and good results were not obtained. In Table 2, the bending strength and the compressive strength are values obtained according to JISR5201. The maximum water absorption is (weight after immersing the test piece in water for 24 hours−dry weight of the test piece) ÷ sample volume × 100
Is required. The 5 cm sucking time is a time measured by absorbing 5 cm of water by the specimen, and the shorter the better, the better. Precisely, the 5 cm siphoning time was obtained by graphing the relationship of the height of the test specimen × (water absorption weight at each water absorption time 時間 maximum water absorption weight), and the time of 5 cm siphoning was determined from the graph.

Next, the addition ratio of the filler C to the early-strength cement (early-strength cement: filler) was changed to prepare samples No. 5 to No. 8 used for semi-flexible pavement, and the bending strength, compressive strength and maximum water absorption were detected. did. The results are as shown in Table 3.

[0031]

[Table 3]

As is clear from Table 3, the higher the filler addition ratio, the higher the maximum water absorption. However, the bending strength is required to be 1.0 N / mm ² or more due to the problem of strength.
No. 8 to which 6 parts were added had a bending strength of 0.3 N / mm ² and had a problem in strength. This test revealed that the filler must be 65 parts or less in order to make the bending strength 1.0 N / mm ² or more. Further, where the maximum water absorption is required to be at least 40% or more, No. 6 in which 25 parts of a filler is added to 100 parts of the early-strength cement has a maximum water absorption of 43.1%, but the filler has a maximum of 24 parts or less. Those (such as No. 5) have a maximum water absorption of 40% or less and have an insufficient water retention function. This test revealed that the filler must be 25 parts or more in order to increase the water absorption to 40% or more.

Next, samples No. 9 to No. 12 of a semi-flexible pavement were prepared by appropriately adding only Filler C, Filler D alone, and Fillers C and D. Flexural strength, compressive strength, maximum water absorption and 5 cm suction time Was detected. The results are as shown in Table 4.

[0034]

[Table 4]

As is clear from Table 4, in Sample No. 10 containing only Filler D, poor curing occurred, but in Samples No. 11 and No. 12 in which Fillers C and D were mixed.
Indicates that the bending strength or the compressive strength is higher than that of the sample No. 9 in which only the filler C is blended.
That is, although it is difficult to use the filler D alone, the water-retentive pavement 1 having higher strength can be obtained by appropriately mixing the filler D with the filler C.

FIG. 2 is a graph showing a change in surface temperature of the water-retentive pavement 1 in a sunshine test. Graph (1) shows the parent asphalt concrete, graph (2) shows the semi-flexible pavement, and graph (3) shows the change in the surface temperature of the water-retentive pavement 1 (sample No. 3) according to the present invention with respect to the sunshine time. Each is shown. As is clear from the graph of FIG. 2, the water-retentive pavement 1 according to the first embodiment (sample No.
By using 3), it has become possible to greatly reduce the surface temperature rise as compared with the conventional base asphalt concrete (1) and semi-flexible pavement (2).

Second Embodiment In the first embodiment, the water-retentive pavement 1 in which the slurry-like filler 4 in which the porous filler is dispersed in the cement is filled in the voids of the concrete has been described. The water-retentive pavement 1 in which a mortar-like fastening agent 5 in which a porous filler is dispersed and added to an aggregate 2, that is, a case where a porous filler is used as the fastening agent 5 will be described in detail.

FIG. 3 is a schematic sectional view showing the structure of the water-retentive pavement 1 using the porous filler as the fastening material 5. In the figure, reference numeral 5 denotes a mortar-like fastening material obtained by dispersing a porous filter in cement. The water-retentive pavement 1 of the second embodiment is completed by mixing the aggregates 2, 2,... And the mortar-shaped fastening member 5, and laying the mixture on the ground.

Water-retentive pavement Nos. 13 to 16 were prepared by mixing a fastener cement, a mixture of fillers C and D, silica sand and water, and a binder 5 and an aggregate 2, and prepared a flexural strength, compressive strength and 5 cm. The siphoning time was detected.
The results are as shown in Table 5.

[0040]

[Table 5]

As is clear from Table 5, the early-strength cement 1
It was found that Sample No. 16 having 29 parts of the filler had almost the same bending strength as the target value of 1.0 with respect to 00 parts, and had a problem in strength. In other words, in this experiment, it was found that the filler needs to be 25 parts or less in order to ensure the strength. Also, 5c
m It is required that the wicking time is 450 seconds or less, whereas No. 13 (16 parts of filler) is 420 seconds, which satisfies the function as a water-retaining pavement. It became 450 seconds or more, and it became clear that the function as a water-retentive pavement could not be exhibited.

FIG. 4 is a graph showing the change in surface temperature of the water-retentive pavement 1 in which the aggregate 2 and the fastening material 5 are mixed by a sunshine test. As in the graph of FIG. 3, graph (1) is parent asphalt concrete, graph (2) is a semi-flexible pavement, graph (3) is a water-retentive pavement (sample No. 3) according to the first embodiment, and graph (4). ) Shows changes in the surface temperature of the water-retentive pavement according to the second embodiment (sample No. 15) with respect to the sunshine time. As is clear from the graph of FIG. 4, the use of the water-retentive pavement according to the second embodiment (sample No. 15) significantly increased compared to the conventional base asphalt concrete (1) and the semi-flexible pavement (2). This has made it possible to reduce the rise in surface temperature.

The second embodiment is configured as described above, and other configurations and operations are the same as those of the first embodiment. Corresponding portions are allotted with the same reference numerals, and description thereof is not repeated. Omitted.

Embodiment 3 A sample in which a porous filler C is mixed with an early-strength cement (No.
17) and a sample (No 18) in which a porous filler C was mixed with foaming cement to which a foaming agent (not shown) was added, and the bending strength, the compressive strength, the maximum water absorption, and the 5 cm suction time were detected. The results are as shown in Table 6.

[0045]

[Table 6]

As is clear from Table 6, in this experiment, Sample No. 18 to which foaming material was added was compared with Sample No. 17
It was found that the maximum water absorption increased, and that the 5 cm wicking time was significantly reduced.

FIG. 5 is a graph showing a change in surface temperature of the water-retentive pavement 1 mixed with a foaming material by a sunshine test. FIG.
And graph (1) is parent asphalt concrete, graph (2) is semi-flexible pavement, graph (3) is water-retentive pavement (sample No. 3), and graph (5) is an embodiment, similarly to the graph of FIG. 3 shows changes in the surface temperature of the water-retentive pavement to which the foamed material according to No. 3 was added (sample No. 18) with respect to the sunshine time. As is clear from the graph of FIG. 5, by using the water-retentive pavement to which the foaming material according to the third embodiment is added (sample No. 18), the conventional base asphalt concrete (1) and the semi-flexible pavement (2) are used. And water-retentive pavement (Sample No. 3) (3)
It has become possible to reduce the rise in surface temperature as compared with.

The third embodiment is configured as described above, and other configurations and operations are the same as those of the first and second embodiments. Corresponding portions are denoted by the same reference numerals. A detailed description thereof will be omitted.

[0049]

As described in detail above, the first invention and the second invention
In the present invention, a slurry filler is prepared by mixing cement and a porous filler having a very high water absorption, and the slurry filler is injected into the voids of the molded porous concrete. Therefore, it is possible to provide a method of forming a high-strength water-retentive pavement and a water-retentive pavement that can be used for roadways by improving the water-retaining ability, thereby suppressing a rise in the temperature of the road surface. further,
By using the water-retentive pavement according to the present invention, it is possible to suppress a rise in the road surface temperature in summer and to mitigate the heat island phenomenon in urban areas.

In the third invention, the bending strength and the compressive strength are ensured by setting the weight ratio of the porous filler as the filler to 65 parts or less with respect to 100 parts of the cement. The water-absorbing function was ensured by setting the weight ratio of the porous filler as the filler to 25 parts or more with respect to 100 parts of the cement. Similarly, to ensure strength, the porosity of the permeable asphalt concrete is 3
0% or less, the viscosity is 15 seconds or less in the P funnel test, and the porosity of the permeable asphalt concrete is 15% or more, and the viscosity is 9 seconds or more in the P funnel test in order to secure the water absorption function. It is possible to provide a water-retentive pavement having high performance and high strength that can be used for roadways.

In the fourth and fifth inventions, since a porous filler having a very high water absorption is used not as a filler but as a fastening material, cement mortar, cement concrete and permeable cement concrete are used. The present invention can also be applied to a method for forming a water-retentive pavement and a water-retentive pavement.

In the sixth invention, in order to secure bending strength and compressive strength, the weight ratio of the porous filler as the fastening material is set to 25 parts or less with respect to 100 parts of cement. Further, in order to secure the water absorption function, the weight ratio of the porous filler as the fastening material is set to 15 parts or more with respect to 100 parts of the cement, so that the water retaining capacity is high and can also be used for roadways. A water-retentive pavement having high strength can be provided.

According to the seventh aspect of the present invention, the filler and the binder have a particle diameter of 1 μm, which is classified as clay having a smaller diameter than sand (particle diameter of 75 μm to 2 mm) and silt material (particle diameter of 5 μm to 75 μm). A porous filler having a size of 5 μm or more is used. Since the porous filler has a very high water absorption of 100% or more, it is possible to provide a water-retentive pavement having a high water-retention ability.

In the eighth invention, a foamed cement obtained by adding a foaming material to cement is used. Foamed cement has more fine voids than ordinary cement (early-strength cement), and therefore has high water retention. Therefore, it is possible to provide a water-retentive pavement having even higher water retention in combination with the water retention ability of the porous filler.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing the structure of a water-retentive pavement using a porous filler as a filler.

FIG. 2 is a graph showing a change in surface temperature of a water-retentive pavement by a sunshine test.

FIG. 3 is a schematic sectional view showing a structure of a water-retentive pavement using a porous filler as a fastening material.

FIG. 4 is a graph showing a change in surface temperature of a water-retentive pavement in which an aggregate and a fastening material are mixed by a sunshine test.

FIG. 5 is a graph showing a change in surface temperature of a water-retentive pavement mixed with a foam material by a sunshine test.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Water-retentive pavement 2 Aggregate 3 Asphalt 4 Filler 5 Fastening material

Claims (8)

[Claims] 1. A method for forming a water-retentive pavement, comprising: forming a porous concrete; and injecting a slurry-like filler obtained by mixing cement and a porous filler into voids of the porous concrete formed body. 2. A water-retentive pavement, characterized by injecting a slurry-like filler obtained by mixing cement and a porous filler into voids of a molded porous concrete. 3. The concrete is a permeable asphalt concrete having a porosity of 15% to 30%, and the slurry-like filler has a weight ratio of the cement and the porous filler to 100 parts of the cement. The water-retentive pavement according to claim 2, wherein the amount of the porous filler is 25 parts to 65 parts, and the viscosity is adjusted for 9 seconds to 15 seconds in a P funnel test. 4. A water retaining material characterized in that a mortar-shaped fastening material obtained by dispersing a porous filler in cement is added to an aggregate and mixed, and a mixture of the aggregate and the fastening material is laid on the ground. Method of forming a conductive pavement. 5. A water-retentive pavement, characterized in that a mortar-like fastening material obtained by dispersing a porous filler in cement is added to an aggregate and mixed. 6. The fastening agent according to claim 5, wherein the weight ratio of the cement and the porous filler is 15 to 25 parts of the porous filler based on 100 parts of the cement. The water-retentive pavement according to the above. 7. The water-retentive pavement according to claim 2, wherein the porous filler has a water absorption of 100% or more and a particle size of 1 μm or more and 5 μm or less. 8. The method according to claim 2, wherein the cement is a foamed cement.
The water-retentive pavement according to 5, 6, or 7.