JP2003313809A - Water-retentive filler for water-permeable asphalt pavement and water-permeable asphalt pavement filled with it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water-retentive filler for water-permeable asphalt pavement capable of giving water retention to a water-permeable asphalt pavement and showing earth color as the whole to provide excellent coordination with the scenery, and a water-permeable asphalt pavement filled with it. <P>SOLUTION: This water retentive filler for water-permeable asphalt pavement comprises a mixture containing paper making sludge incineration fly ash and a solidifying agent for solidifying it, and is filled in voids of a water-permeable asphalt pavement by pouring the aqueous slurry of the mixture onto the pavement surface. The water-retentive filler may comprise an aggregates. This water-permeable asphalt pavement is obtained by pouring the aqueous slurry of the water-retentive filler for water-permeable asphalt pavement to the surface of an asphalt pavement and filling it into voids of the asphalt pavement. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water-retaining filler for imparting water retention to a water-permeable asphalt pavement and a water-permeable asphalt pavement filled with the water-retaining filler.

[0002]

2. Description of the Related Art Conventionally, asphalt pavement has been
It has been extensively constructed on sidewalks, promenades, parks, plazas, administrative roads, garages, etc. However, since asphalt pavement easily absorbs solar heat, the asphalt pavement becomes a high temperature during the daytime and gradually releases the absorbed heat at night, which is considered to be a cause of the so-called heat island phenomenon, which causes tropical night especially in summer. Therefore, in asphalt pavement that mainly uses coarse aggregate with a large grain size and permeates rainwater into the ground through voids, when water is retained inside the pavement and this retained water gradually evaporates Several proposals have been made to solve the heat island phenomenon, which involves lowering the temperature of the pavement surface by the heat of vaporization of the pavement.

In Japanese Patent Laid-Open No. 2000-120010,
A water-permeable asphalt pavement structure has been proposed which comprises a water-retaining roadbed formed of a roadbed material mainly composed of water-retaining aggregate and a water-permeable pavement laid above the water-retaining roadbed. Further, there has been proposed a water-permeable asphalt pavement in which silica sand is filled into the voids of the water-permeable asphalt pavement while mechanically vibrating it, and cement and the like are integrated with the asphalt.

[0004]

However, there has been no proposal up to now to fill the voids of the water-permeable asphalt pavement with a clay-like filler. Further, conventionally, the entire permeable asphalt pavement has a blackish brown color and lacks harmony with the landscape such as sidewalks and parks where the permeable asphalt pavement is constructed.

The present invention has been made in view of the above circumstances. Water is imparted to the pores of a water-permeable asphalt pavement by being filled with a clay-like filler, and the whole exhibits a soil color. An object of the present invention is to provide a water-retaining filler for a water-permeable asphalt pavement that is also excellent in harmony with the landscape and a water-permeable asphalt pavement filled with the water-retaining filler.

[0006]

DISCLOSURE OF THE INVENTION The inventors of the present invention have earnestly studied in order to solve the above-mentioned problems and conceived the present invention.
That is, the present invention is composed of a mixture containing a papermaking sludge incineration ash and a solidifying material for solidifying the ash, and by pouring an aqueous slurry of the mixture onto the pavement surface, the voids in the water-permeable asphalt pavement are filled. The water-retaining filler for water-permeable asphalt pavement.

Further, the gist of the water-permeable asphalt pavement is characterized in that an aqueous slurry of the water-retaining filler for the water-permeable asphalt pavement is poured onto the pavement surface and filled in the voids in the asphalt pavement.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below with reference to embodiments. The water-retaining filler for water-permeable asphalt pavement of the present invention is composed of a mixture containing papermaking sludge incineration ash and a solidifying material for solidifying the ash.

The papermaking sludge incineration ash is obtained by burning papermaking sludge of waste pulp material, or by incinerating clays used for smoothing the surface of paper generated as papermaking sludge and preventing ink bleeding of recycled paper. It is a porous clay-like substance rich in minerals and Al. The papermaking sludge incineration ash is preferably a powdery material. Further, most of the papermaking sludge incineration ash has been disposed of by landfill conventionally, and by using this, it is possible to contribute to effective use of industrial waste.

As the solidifying material, it is presumed that papermaking sludge incineration ash is rich in Si content and Al content and produces ettringite or the like, or it reacts with Si content in a porazon. Any substance that forms a body may be used, and slaked lime can be preferably used. Alternatively, quick lime that reacts with water to form slaked lime may be used.

As the slaked lime, a mixture of gypsum and blast furnace slag fine powder may be used. In this case, a mixture of 25 to 65% by weight of slaked lime, 5 to 25% by weight of gypsum, and 30 to 50% by weight of blast furnace slag fine powder is preferable.

As the solidifying material, in addition to the above slaked lime, any one or more of Portland cement, blast furnace cement, early strength cement and cement-based solidifying material may be used.

The mixture containing the papermaking sludge incineration ash and the solidifying material is 20 to 90% by weight of the papermaking sludge incinerating ash and the solidifying material 10.
It is preferable to mix them in a proportion of from 80 to 80% by weight, and more preferably, both of them are from 30 to 70% by weight. This is because if the amount of papermaking sludge incineration ash is less than 20% by weight, the solidified body will not be sufficiently porous so that sufficient water retention cannot be imparted, and if it is more than 90% by weight, the papermaking sludge incineration ash cannot be sufficiently solidified. Is.

Further, the water-retaining filler may have a composition containing aggregate in a mixture containing papermaking sludge incineration ash and a solidifying material for solidifying the ash. By including the aggregate, the water retention effect can be improved or the strength of the solidified body can be increased. Examples of such an aggregate include granular paper sludge incineration ash, brick waste, kawar waste, clinker ash, tankar, and the like, and one or more kinds of them can be used.

Next, the construction of the pavement body filled with the water retention filler of the water-permeable asphalt pavement of the present invention will be described. First, the water-permeable asphalt pavement is constructed in advance.
The water-permeable asphalt pavement may be any one that is normally constructed, and it is performed by forming a water-permeable roadbed on a roadbed formed by reclaiming sandy soil, etc., and then forming a surface water-permeable ascon on it. be able to. Water permeable ascon is formed by asphalt, aggregate and filler. As the aggregate, coarse aggregate having a large particle size such as crushed stone, crushed stone, and gravel is used, and limestone powder, slaked lime, cement or the like is used as a filler. The permeable roadbed may be made of crushed stone, but it is also made of porous aggregate such as clinker ash, brick waste, and volcanic gravel, or a soil improvement layer consisting of porous aggregate and soil and a soil stabilizer. May be. This is because the use of porous aggregate or the like can serve as a supply source of water evaporated from the pavement surface when sufficient permeated water is present. Note that the water-permeable asphalt pavement is not limited to the above-mentioned configuration, and may be any asphalt pavement that allows rainwater or the like to permeate from the pavement surface to the underground through the voids.

A water-retaining filler made of a mixture containing paper ash sludge incineration ash and a solidifying material (which may contain an aggregate) is slurried with water, and the slurry is sufficiently cured to obtain the above-mentioned water-permeable asphalt pavement. Pour onto the pavement surface. Then, the slurry is evenly dispersed with a brush or the like to fill the voids of the water-permeable asphalt pavement. The papermaking sludge incineration ash can be quickly completed because the solidified material promptly forms a solidified body and becomes a dry state.

In the water-permeable asphalt pavement thus obtained, the porous and rigid solidified body of the water-retaining filler is filled in the voids to impart the water-retaining property to the water retained in the pavement. The temperature of the pavement surface can be lowered by the heat of vaporization taken away by evaporation. Further, the water-retentive filler of the present invention has not only water-retaining property but also appropriate water-permeability, and therefore, the purpose of constructing a water-permeable asphalt pavement is not lost. Furthermore, papermaking sludge incineration ash
Some of them are soil-colored because they are rich in iron, and by using this, the water-permeable asphalt pavement can be made to be soil-colored as a whole.

[0018]

EXAMPLES Next, the present invention will be described with reference to examples.
The present invention is not limited to the examples below.

Two 30 × 30 × 4.5 (cm) water-permeable askons were produced from straight asphalt, aggregate and filler. An aqueous slurry having the composition shown in Table 1 was poured onto the surface of one water-permeable ascon and dried to obtain an example. Further, other water-permeable askons were used as they were as comparative examples.

[0020]

[Table 1]

(Evaluation of Water Permeability) The water permeable ascon of Examples and Comparative Examples were each saturated with water, and a cylindrical body having a diameter of 14 cm and a height of 20 cm with both ends opened was placed on the surface of the water permeable ascon to obtain water permeability. Around the lower part of the cylindrical body in contact with the conductive ascon was sealed with oil clay. Then, 2 L of water was injected into the cylindrical body. The example sets the height of the water in the injected cylinder to 3
It is measured every 0 minutes for a total of 2 hours. In the comparative example, the height of water in the injected cylinder is measured every 30 seconds for a total of 2 minutes, and the water permeability of the water-permeable ascon is evaluated. It was The amount of permeation was calculated from the amount of decrease in the height of water in the cylinder. The results are shown in Table 2.

[0022]

[Table 2]

As is clear from Table 2, the water permeability of the example was lower than that of the comparative example, but the water permeability was to some extent.

(Evaluation of Water Retention) Each of the water-permeable askons of Examples and Comparative Examples was saturated with water and then dried. The difference between the mass of the water-permeable Ascon at the time of water saturation and the mass after drying was obtained, and this mass difference (equal to the volume) was divided by the volume to evaluate the water retention. The results are shown in Table 3.

[0025]

[Table 3]

As is clear from Table 3, the examples had high water retention.

(Measurement of Surface Temperature) As shown in Table 4, the water-permeable askons of Examples and Comparative Examples were left outdoors and the surface temperature was measured with time.

[0028]

[Table 4]

As is clear from Table 4, the examples were excellent in suppressing the surface temperature of the water-permeable ascon.

[0030]

Since the present invention is configured as described above, it has the following effects. According to the water retention filler for water permeable asphalt pavement of the present invention, water retention can be imparted to the asphalt pavement by filling the voids of the water permeable asphalt pavement.

According to the water-permeable asphalt pavement of the present invention, since water retention is imparted, it is possible to suppress an increase in the temperature of the pavement surface and contribute to elimination of the heat island phenomenon.

Some of the water-retaining fillers of the water-permeable asphalt pavement of the present invention have a soil color, and according to the water-permeable asphalt pavement using the same, sidewalks, promenades, plazas,
It is in good harmony with the landscape of parks and the like and can give comfort to users.

According to the water-permeable asphalt pavement of the present invention, since the voids are filled with the water-retaining filler, it is not necessary to clean the voids clogged with sand as in the conventional water-permeable asphalt pavement. Maintenance of the road will be easy, and freezing damage such as frost columns will not occur in winter. Further, since the voids are filled with the solidified solid of the water retentive filler, the strength of the pavement surface is increased, and cracks are less likely to occur on the pavement surface even when the pavement base is soft.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Takaya Imai             Giken Co., Ltd. 2-46 Nishizaki-cho, Ogaki City, Gifu Prefecture             Inside the company F-term (reference) 2D051 AA02 AB03 AD08 AF01 AF05                       AF14 AF15 AH02 EA06 EB06

Claims (9)

[Claims] 1. A mixture comprising a papermaking sludge incineration ash and a solidifying material for solidifying the ash, wherein an aqueous slurry of the mixture is poured onto a pavement surface to fill voids in the water-permeable asphalt pavement. Water-permeable filler for water-permeable asphalt pavement. 2. A water-retentive filling for water-permeable asphalt pavement according to claim 1, wherein the papermaking sludge incineration ash is mixed in a proportion of 20 to 90% by weight and the solidifying material is mixed in a proportion of 10 to 80% by weight. Material. 3. The water-retaining filler for water-permeable asphalt pavement according to claim 1 or 2, wherein the solidifying material is slaked lime. 4. The water-retaining filler for water-permeable asphalt pavement according to claim 1, wherein the solidifying material is a mixture of slaked lime, gypsum and blast furnace slag fine powder. 5. Slaked lime is 25 to 65% by weight and gypsum is 5 to 5.
The water-retaining filler for water-permeable asphalt pavement according to claim 4, wherein 25 wt% and blast furnace slag fine powder are blended in a proportion of 30 to 50 wt%. 6. The water-permeable asphalt pavement according to claim 1, further comprising an aggregate in a mixture containing paper ash sludge incineration ash and a solidifying material for solidifying the ash. Water retention filler. 7. A water-based slurry of the water-retaining filler for a water-permeable asphalt pavement according to any one of claims 1 to 6, which is poured onto a pavement surface and filled in voids in the asphalt pavement. A permeable asphalt pavement to be used. 8. The water-permeable asphalt pavement according to claim 7, wherein the water-based slurry contains 100 to 160 g of water with respect to 100 g of the water-retaining filler. 9. The water-permeable asphalt pavement according to claim 7, wherein the water-permeable roadbed is composed of a porous aggregate or a soil improvement layer.