JPH1067579A - Production of double-layer water-permeable paving block - Google Patents

Abstract

PROBLEM TO BE SOLVED: To produce a lightweight double-layer water-permeable paving block having a high added value by effectively utilizing an incineration furnace ash such as a sewage sludge. SOLUTION: A mixed powder F, prepared by adding 6-20 pts.wt. total amount of a mixture E containing a clay and a glass powder and/or water glass to be bonding parts to 100 pts.wt. mixed aggregate D obtained by mixing >=60 pts.wt. porous aggregate A, prepared by granulating an incineration furnace ash and baking the granulated ash and having >=0.6mm grain diameter, <=1.45 average apparent specific gravity and closed cells with <=40 pts.wt. total amount of an aggregate B of a crushed porcelain and/or an aggregate C of a crushed feldspar and capable of forming a bulk layer is filled in a pressing mold to fill a predominant quantity of the volume of the pressing mold. The balance of the volume of the pressing mold is then filled with a mixed powder H, obtained by adding 6-20 pts.wt. total amount of the mixture E containing the clay and the glass powder and/or the water glass to be the bonding parts to 100 pts.wt. mixed aggregate G containing >=80wt.% total amount of the aggregate B of the crushed porcelain and/or the aggregate C of the crushed feldspar and capable of forming a surface layer. The bulk layer and the surface layer are integrally press formed and subsequently baked to produce a double-layer water-permeable paving block.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a pavement block by effectively utilizing waste incinerator ash.

[0002]

2. Description of the Related Art Landfilling of urban garbage and sewage sludge as it is, fills the landfill in a short period of time. Because it is difficult to secure a landfill, a method has been adopted in which municipal garbage is incinerated to reduce the volume to the state of incinerator ash before landfill. However, even if the volume is reduced to the state of incinerator ash, the amount of incinerator ash generated is large, so it is necessary to secure a landfill site, as well as transportation and work costs, etc. Is desired.

[0003] If the incinerator ash can be used effectively, that is, if the incinerator ash can be converted into a useful product, the cost of the subsequent treatment of the incinerator ash can be reduced, and no landfill is required.
For this reason, a technique has been developed in which the incinerator ash is melted in an incinerator to take out the incinerator ash as aggregate and use the aggregate for road construction. However, because of the large amount of incinerator ash generated, it is necessary to develop and dispose of various uses.

One example of the use of incinerator ash is in pavement blocks on sidewalks. Particularly recently, a permeable pavement block has been developed and put into practical use. If a permeable block is paved on the sidewalk, rainwater seeps into the ground during rainfall, thereby reducing the burden on sewerage facilities and reducing the temporary inflow of rainwater from rainfall into urban rivers. In addition, it is possible to prevent the depletion of groundwater, thereby preventing an increase in the underground temperature and an oxygen deficiency state in the underground, and an effect of increasing the growth of street trees and the like.

[0005] A permeable pavement block having a high porosity is not slippery when walking, and a puddle cannot be formed by a little rainfall.
In addition, water retention is given to the sidewalk, and the temperature of the road surface is less likely to rise compared to concrete pavement and asphalt pavement,
The porous material has the advantage that it has heat insulation properties, and if it is lightweight, it can be easily used for a roof deck that is installed on the roof of a building.

[0006] The permeable pavement block has a quality standard of the Interlocking Block Association. According to the standard, the bending strength is 30 kg / cm ² or more, and the compressive strength is 70 kg / cm ^2.
cm ² or more and a water permeability of 1.0 × 10 ⁻² cm / sec or more are required. As an example of the permeable pavement block, a porcelain permeable pavement block is sold by Toray under the name Tresle. According to the catalog, the bulk density of this porcelain block is 1.60 g / cm ³ , the bending strength is 40 kg / cm ² or more, and the compressive strength is 200 kg / c.
m ² , and the water permeability is 2.0 × 10 ⁻² cm / sec.

[0007] As an example of a permeable pavement block using incinerator ash as a raw material, a permeable pavement block is sold by Fujimi Ceramics Co. under the name of Natural Walk. According to the catalog, the bulk specific gravity of this permeable pavement block is about 1.53 to 1.56 g / cm ³ , and although not particularly described, it is considered that the bending strength, the compressive strength and the water permeability satisfy the above-mentioned quality standards. A permeable pavement block having a colored and colored surface layer is disclosed.

According to the analysis data of the Tokoname Ceramics Technology Center in Aichi Prefecture, the analysis value of the incinerator ash of sewage sludge at the Yamazaki sludge treatment plant in Nagoya City was 46.2% by weight of SiO ₂ and Al ₂
O ₃ 15.8% by weight, Fe ₂ O ₃ 10.8% by weight, P ₂
O ₅ 13.4% by weight, CaO 5.48% by weight, Mg
2.38% by weight of O, 1.24% by weight of Na ₂ O, K ₂ O
Is 1.91% by weight, TiO ₂ is 0.66% by weight, loss on ignition is 1.70% by weight, and the fire resistance is SK03a (10%).
40 ° C).

Also, according to the piping technology, June 1993, page 78 et seq. (Hereinafter referred to as reference a), the Tokyo Metropolitan Sewerage Bureau proposed to use sludge incinerator ash as artificial lightweight aggregate, and Mitsui Engineering & Shipbuilding Co., Ltd. A plant for producing artificial lightweight aggregates using 100% sludge incinerator ash was developed with the cooperation of. This technology for producing artificial lightweight aggregate is obtained by applying the technology of producing artificial lightweight aggregate by firing expansive shale to incinerator ash.
That is, the incinerator ash of finely pulverized sewage sludge is granulated into round particles by a pan-type granulator using an alcohol fermentation waste liquid of molasses as a binder, and the dried granulated product is fed into a multi-stage jet furnace, and is subjected to about 1050 ° C to make the surface of the particles semi-molten, gasify the high-temperature volatile components contained in the incinerator ash and foam them, take out the swollen particles from the high-temperature range, air-cool, and obtain spherical or spherical particles containing many closed cells. Has obtained an oval artificial lightweight aggregate.

The chemical component of the sludge incinerator ash is SiO ₂
39.55% by weight, Al ₂ O ₃ 16.41% by weight, F
e ₂ O ₃ 11.75% by weight, FeO 2.09% by weight,
P ₂ O ₅ is 10.10% by weight, CaO is 8.36% by weight,
2.46% by weight of MgO, 1.84% by weight of Na ₂ O,
K ₂ O is 1.36% by weight, SO ₃ is 0.84% by weight, C is 0.67% by weight, CO ₂ is 0.13% by weight, and the ignition loss is 2.67% by weight. This artificial lightweight aggregate made of 100% sludge incinerator ash contains a large amount of closed cells,
The water absorption of the lightweight fine aggregate having a particle size of 0.6 to 3.5 mm is 8.8%, the absolute specific gravity (same as the apparent specific gravity) is 1.40,
The unit volume weight is 0.868 kg / liter. This artificial lightweight fine aggregate is named Slajilite, flower pot, potted sand, construction material aggregate, sewer permeable material,
Partly used as a filter material for sewage sand filtration equipment. However, sludge incinerator ash generally has a dark gray tinge, and it is difficult to obtain decorative colors only with sludge incinerator ash.

Japanese Utility Model Laid-Open No. 2-2588 discloses a permeable pavement block for sidewalks in which the cost of raw materials for aggregates is reduced by using granulated slag obtained by melting incinerator ash as aggregates. This permeable pavement block is bonded by cement without firing. In addition, the surface layer is made of natural fine stone or artificial crushed stone without using slag aggregate as the aggregate of the surface layer in order to color it in a color other than the color unique to slag aggregate. A multi-layer permeable pavement block with layers has been proposed.

Japanese Patent Publication No. 7-25600 discloses a method in which ceramic powder (incinerator ash is not used) is formed into a spherical shape, and a spherical aggregate having a uniform average particle size of about 2 mm is used as the aggregate. A pavement block is disclosed in which a flux component having a small coefficient of thermal expansion is added to a joint portion and fired, and the pavement block has good water permeability and is hardly clogged. Further, there has been proposed a multilayer pavement block in which a surface layer formed of a fine-grained spherical aggregate colored with a pigment is integrated with a bulk layer. Although there is no description about the physical properties of the obtained water-permeable block in the examples in the publication, it is described that the water-permeable block has high strength, good water permeability, and is hardly clogged.

[0013]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a lightweight, high value-added, multi-layer permeable pavement block utilizing ash from sewage sludge and municipal waste effectively.

[0014]

According to the present invention, there is provided a method for producing a multi-layer permeable pavement block according to the present invention, wherein an incinerator ash is granulated and fired, and the average apparent specific gravity is 1.45 or less. A total of 4 parts of aggregate B crushed with porcelain and / or aggregate C crushed with feldspar is added to 60 parts by weight or more of porous aggregate A having bubbles.
0 parts by weight or less, based on 100 parts by weight of the mixed aggregate D,
A mixed powder F for forming a bulk layer to which a mixture E containing 6 to 20 parts by weight of a mixture E containing clay, glass powder and / or water glass as a bonding portion is filled in a press mold, and a majority of the volume of the press mold is filled. And the remaining part of the volume of the press mold is combined with the combined part with 100 parts by weight of the mixed aggregate G containing the aggregate B crushed with porcelain and / or the aggregate C crushed with feldspar in a total amount of 80% by weight or more. The mixture E containing 6 to 20 parts by weight of a mixture E containing clay and glass powder and / or water glass is filled with a mixed powder H for forming a surface layer, and the bulk layer and the surface layer are press-formed integrally, Then, firing is performed.

[0015] Generally, the higher the porosity of a ceramic, the lighter it is. However, if the porosity is large, the strength is conversely reduced.
However, when a porous aggregate having many closed cells is used, a sintered body having high strength can be obtained even if it is porous. In addition, closed cells are also referred to as closed pores, meaning closed pores not connected to the surface, and the amount of closed cells in the porous aggregate is defined by an apparent specific gravity. For example, the apparent specific gravity of the aggregate is about 1.5 and the average true specific gravity of the material constituting the aggregate is 2.
When 0 (the true specific gravity of this material is usually greater than 2), it will contain about 25% closed cells. The present invention realizes a multi-layer water-permeable pavement block having both high porosity (low bulk specific gravity) and practical strength by applying this effect.

In the multilayer water-permeable pavement block of the present invention, the porous aggregate A of the bulk layer is bonded by the mixture E serving as a bonding portion containing clay and glass powder and / or water glass. When glass powder or water glass is used for the mixture E to be the bonding portion, the firing temperature of the pavement block can be lowered, and the surface of the aggregate is covered with a vitreous film and the inner surface of the pores becomes smooth, so that water permeability is good. Pores imparting water permeability to the multi-layer pavement block are less likely to be closed by earth and sand. Also,
The use of clay (which is a fine powder) for the mixture E serving as a joint can increase the strength of the multilayer pavement block. That is, the bulk layer is composed of 100 parts by weight of the mixed aggregate D containing 60% by weight or more of the porous aggregate A having an average apparent specific gravity of 1.45 or less and having a closed cell, and containing clay, glass powder, and / or water glass. Of powder mixture in which 6 to 20 parts by weight of the mixture E to be mixed is press-formed and then fired. In this case, if there is a difference between the firing shrinkage of the bulk layer and the firing shrinkage of the surface layer, and the warpage occurs, the mixing ratio of the mixture E to be mixed into the bulk layer and the surface layer or the mixture E to the aggregate.
It is advisable to adjust the amount by changing the mixing amount.

It is difficult to produce a porous aggregate having a small bulk specific gravity of less than 0.6 mm, and if the aggregate contains many fine aggregates having a particle size of less than 0.6 mm, the water permeability of the pavement block decreases, and Therefore, the pores are easily clogged and the water permeability deteriorates. Therefore, an aggregate having a particle size of 0.6 mm or more is used as the aggregate. Further, if the amount of the porous aggregate A made of incinerator ash can be increased, a multilayer pavement block can be manufactured at a low cost. The amount of the porous aggregate A used in the aggregate of the bulk layer is preferably 70% by weight or more.

The joint of the mixture E in which the clay and the glass powder and / or the water glass are combined has an effect of giving a large strength to the sintered body. The mixed aggregate D10 of this mixture E
0 parts by weight and 100 parts by weight of the mixed aggregate G are 6
If the amount is less than 10 parts by weight, it is difficult to provide a practically large strength. If the amount is more than 20 parts by weight, pores existing between the aggregate particles are reduced, and a block having good water permeability cannot be obtained. Considering the balance between the strength and permeability of the permeable pavement block, one of the mixed aggregate D and the mixed aggregate G
The blending amount of the mixture E with respect to 00 parts by weight was 8 to 1
Preferably it is 5 parts by weight. Further, the compounding amount of the clay and the glass powder and / or water glass in the mixture E is 35 to 35 clay.
65% by weight of glass powder and water glass together
The content is preferably 5 to 35% by weight. If the same mixture E is used for both the joints of the bulk layer and the surface layer, the process of manufacturing the block can be simplified, and at the same time, the warpage of the multilayer pavement block during firing can be reduced, and the bonding strength between the bulk layer and the surface layer can be reduced. Can be larger.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION The surface of a multi-layer pavement block has a light color or a desired color in a decorative color other than reddish brown of iron oxide when incinerator ash is baked in an oxidizing atmosphere in an oxidizing atmosphere. In order to be colored, the multilayer pavement block has a multilayer structure including a bulk layer and a surface layer. That is, a colorless or light-colored aggregate that is easily colored is used for the surface layer in an amount of 80% by weight or more, and the mixed powder F that forms a bulk layer that occupies a majority of the volume of the multilayer water-permeable pavement block is a porous aggregate. By using A in an amount of 60% by weight or more, the bulk specific gravity of the multilayer pavement block can be reduced, and a large amount of incinerator ash can be digested. The thinner the surface layer, the lighter the block can be, but if it is too thin, the color of the bulk layer will appear on the block surface when the surface layer is worn out, impairing the appearance and equalizing the thickness during manufacturing Therefore, the thickness is preferably 3 to 10 mm, or 5 to 16% of the total thickness of the multilayer pavement block.

In the multilayer water-permeable pavement block of the present invention, the bulk layer and the surface layer are integrally formed by pressing and then fired.
Multi-layer permeable pavement block. The closed cells in the porous aggregate A used for the bulk layer of the multilayer pavement block do not contribute to the water permeability of the multilayer pavement block, and are exclusively transmitted through the pores formed between the porous aggregates. . The main raw material of the multilayer pavement block of the present invention is preferably a method described in Document a, that is, a spherical or elliptical aggregate produced by granulating incinerator ash and firing in a multistage jet furnace. use.
Since the aggregate manufactured by the method of Document a has undergone a semi-molten state at the time of heat treatment, the structure of the aggregate except for closed cells is dense and has a high strength. The layer pavement block has a high strength even if the aggregate contains a lot of air bubbles, the bulk specific gravity of the aggregate is small by the amount of a lot of closed cells, and the block is light in weight.

Aggregate B obtained by crushing porcelain or feldspar aggregate C has a high fire resistance near 100 ° C. as compared with porous aggregate A. When these aggregates having a high fire resistance are mixed with a porous aggregate having a low fire resistance, the dimensional change and deformation of the multilayer pavement block during firing can be reduced. For this reason, if these aggregates are mixed with the aggregate of the bulk layer, the firing of the multilayer pavement block can be facilitated. Aggregate B obtained by crushing porcelain is an aggregate obtained by crushing porcelain tiles and other rejected porcelain, commonly called selven, and is a light-colored or white aggregate that is easily colored. Feldspar is contained abundantly in, for example, weathered granite sand and used as a raw material for porcelain. Aggregate C of feldspar is a colorless or white aggregate that can substitute aggregate B. Selven and feldspar aggregates are less expensive if they do not require any labor, so they need not be formed into spherical or elliptical shapes. As for the pores formed between the aggregates, the larger the average particle diameter of the aggregate and the more uniform the particle diameter of the aggregate, the higher the water permeability. Also,
The surface layer formed by blending a large amount of crushed square aggregate B and aggregate C that is not granulated into a spherical shape or an oval spherical shape has an advantage of having a non-slip surface when used as a pavement block.

As the aggregate of the surface layer, the mixing ratio of the porous aggregate A obtained by granulating the incinerator ash is reduced to 20% by weight or less in the mixed aggregate G, and the light or white aggregate B and the aggregate are reduced. Increase the mixing ratio of C. That is, in order to color the surface layer or to obtain a color close to white, the aggregate B and the aggregate C are combined in an amount of 80% by weight or more in the aggregate G. The aggregates B and C have a small amount of porosity compared to the porous aggregate A and have a high abrasion resistance because they are dense, and the surface layer of the block has excellent abrasion resistance. More preferably, a surface layer is formed by adding a pigment for coloring. If the average particle size of the mixed aggregate G used for the surface layer is preferably smaller than the average particle size of the mixed aggregate D of the bulk layer, the appearance when the multilayer pavement block is constructed is improved.

The optimum temperature for firing the block is mixed powder F
Although it varies depending on the blending ratio of the mixed powder H and the fire resistance of the raw material used, it is preferable to bake at 1030 ° C. or higher so as to give practically sufficient strength. If the firing temperature is too high, the multi-layered pavement block is deformed or the porosity decreases, so firing at 1100 ° C. or less is preferable. The sintering temperature is 1040 to 1070 ° C so that the pavement block can be imparted with good balance of strength and water permeability.
More preferably, If the firing time of the block is too short, uneven firing occurs in the multi-layer pavement block, and the strength and other quality of the multi-layer pavement block are not stable. Therefore, the firing time maintained at the above-mentioned firing temperature should be 3 to 12 hours. It is preferable that the operation time of the firing furnace from temperature increase to cooling when using a batch type firing furnace is set to 24 to 35 hours.

In the preferred method for producing a multilayer permeable pavement block according to the present invention, the bulk layer of the obtained multilayer pavement block has a bulk specific gravity of 1.50 or less and a bending strength of 50 k.
g / cm ² or more. Lightweight multi-layer pavement blocks with a low bulk specific gravity have the advantage that the transportation cost to the site can be reduced and the heavy work of road construction can be reduced. Further, if a multi-layer pavement block having a bending strength as large as 50 kg / cm ² or more is used, the pavement road is less likely to be damaged and has excellent durability.

According to another preferred method for producing a multilayer water-permeable pavement block of the present invention, the average particle diameter of the porous aggregate A is 1.5 to 1.5.
The material adjusted to 3 mm is used for the aggregate of the bulk layer. As a result, a multilayer pavement block having good water permeability and practically sufficient strength can be obtained.

Another preferred method for producing a multilayer permeable pavement block according to the present invention is a method for producing a mixed aggregate D
4 parts by weight or less of water glass is mixed with 100 parts by weight of the mixed aggregate G in the mixed powder H and 100 parts by weight of the mixed glass. When water glass is mixed with the mixed powder F and the mixed powder H, the green strength of the multilayer pavement block in a pressed state is improved and its handling is facilitated, and the strength of the multilayer pavement block and the product yield thereof are improved. Is improved. However, since the effect is small even if mixing too much, the content is preferably 4 parts by weight or less.

According to another preferred method for producing a multilayer water-permeable pavement block of the present invention, 0.3 to 3.0 parts by weight of a pigment is mixed with 100 parts by weight of the mixed powder H. The reason is that if the mixing amount is less than 0.3 parts by weight, the coloring effect of the multilayer pavement block is hardly obtained, and if the mixing amount is more than 3.0 parts by weight, the added value corresponding to the cost of mixing the pigment cannot be obtained. Because. Even if the mixed powder F and the mixed powder H to be filled into the space of the press die are changed in order, and the mixed powder H is filled first, the effect obtained is not changed.

[0028]

EXAMPLES Hereinafter, the present invention will be described specifically with reference to examples, but the present invention is not limited to these examples.

Example 1 A porous or oval-shaped porous aggregate A having a particle diameter of 0.6 to 3.5 mm, an average particle diameter of 2.5 mm and an apparent bulk specific gravity of 1.34 (the closed cell described above) Of feldspar collected from weathered granite having a particle size of 3 mm or less and an average particle size of 2.4 mm B20 wt%, a particle size of 3 mm or less and an average particle size of 2.0 mm Elutriated clay 5 of 200 μm or less is used for 100 parts by weight of the mixed aggregate D comprising 15% by weight of the aggregate C.
10 parts by weight of a mixture E serving as a bonding portion composed of 5% by weight, 40% by weight of glass powder obtained by grinding a waste glass bottle to 200 μm or less, and 5% by weight of JIS No. 3 water glass (in terms of dry weight of liquid water glass). Powder F forming bulk layer by heating
And

The elutriated clay 5 was added to 100 parts by weight of the mixed aggregate G comprising 90% by weight of the aggregate B and 10% by weight of the porous aggregate A.
5% by weight, 40% by weight of glass powder obtained by pulverizing a glass bottle, JIS No. 3 water glass (in terms of dry weight of liquid water glass) 5
10 parts by weight of a mixture E as a bonding portion consisting of 10% by weight was mixed to obtain a mixed powder H forming a surface layer.

Normal bricks (size 115 mm × 230 mm ×
Use a press mold to form a sheet with a thickness of
The mixed powder F of the multilayer pavement block raw material is filled in the molding space of the 00 mm press die, and then the lower piece (the lower press table of the press) is lowered by about 10 mm to the upper space of the press die formed. Body H was filled. A pressure of 180 kg / cm ² was applied to a press filled with both powder raw materials, and the molded product was demolded to press-mold a multilayer pavement block having a surface layer of about 5 mm above the molded body. The formation form of this multilayer pavement block is 8
After drying at 0 ° C. for about 4 hours, it was placed in a baking furnace, heated to 1050 ° C. at a rate of 73 ° C./hour, kept at this baking temperature for about 6 hours, and then allowed to cool. The time required for firing was 27 hours in total including the cooling time. The shrinkage ratio of the multilayer pavement block obtained by combining the drying shrinkage and the firing shrinkage was about 2%.

The obtained multilayer pavement block had a white surface layer and a reddish brown bulk layer. Physical properties of the obtained multilayer pavement block were measured. This multilayer pavement block has a bulk specific gravity of 1.43, an apparent porosity of 21%, and a water permeability of 1.5 × 10 ^-2 / sec. The bulk layer of the block has a bulk specific gravity of 1.36, a bending strength of 51 kg / cm ² , The compression strength was 180 kg / cm ² . The physical properties were measured by measuring the bulk density and apparent porosity by the water immersion method, and measuring the water permeability by the head difference method, which is the water permeability test method specified in the Interlocking Block Pavement Design and Construction Procedure, and the bending strength was measured by the interlocking method. Measured by the centralized loading method specified in the block pavement design and construction procedure, and the compressive strength is JIS-A-1
It measured by the method based on No.108. In addition, the joint strength at the boundary between the surface layer and the bulk layer was examined by a method in accordance with the test method according to the adhesion strength of the Ministry of Construction's Common Specifications for Construction Work. It was found to have joint strength.

Example 2 In Example 1, an average particle size of about 4 parts by weight based on 100 parts by weight of the mixed powder H forming the surface layer was used.
One part by weight of a 0 μm blue pigment (a mixture composed of 65% by weight of Al ₂ O ₃ , 20% by weight of ZnO, and 15% by weight of CoO) was mixed, and the procedure of Example 1 was repeated to prepare a multilayer pavement block. The color of the surface layer of the obtained multilayer pavement block was blue. The physical properties of the obtained multilayer pavement block were measured in Example 1.
The physical properties of this multilayer pavement block were almost the same as the physical properties of the multilayer pavement block of Example 1, including the physical properties of the bulk layer of the block, as measured by the same method as in Example 1.

[Example 3] In Example 2, the porous aggregate A was not used as the aggregate of the mixed powder H in the surface layer, but the feldspar aggregate C having the same weight was used instead. Others are Example 2.
A multi-layer pavement block was prototyped in the same manner as described above. The color of the surface layer of the obtained multilayer pavement block became clearer blue. When the physical properties of this multilayer pavement block were measured, the block had a bulk specific gravity of 1.47, an apparent porosity of 20%, a water permeability of 2.2 × 10 ^-2 / sec, and the bulk layer of the block had a bulk specific gravity of 1 .36, the bending strength was 51 kg / cm ² , and the compression strength was 180 kg / cm ² .

Comparative Example 1 In Example 1, the mixture E was mixed with the mixed powder F and the mixed powder H without using clay.
Instead, the same weight of glass powder was increased and mixed, and the other steps were the same as in Example 1 to produce a multilayer pavement block. What changed in the multilayer pavement block of Comparative Example 1 as compared with Example 1 was that the shrinkage by drying and firing was about 1%, the color of the surface layer was light green, and the color of the bulk layer was dark brown. Is a point. When the physical properties of this multilayer pavement pavement block were measured, the bulk specific gravity of the block was 1.43 and the water permeability was 2.4.
× 10 ^-2 / sec, apparent porosity is 22%, bulk density of the block bulk layer is 1.37, and flexural strength is 40k.
g / cm ² , and the compressive strength was 170 kg / cm ² .

[Comparative Example 2] In Example 1, the same incinerator ash was melted and crushed after the same incinerator ash was melted instead of using the porous aggregate A as the aggregate of the bulk layer and the surface layer. A multilayer pavement block was trial-produced in the same manner as in Example 1 except that an aggregate (bulk specific gravity: 2.0) whose particle size was adjusted to have a particle size of 0.5 mm and an average particle size of 2.5 mm was used. The color of the obtained multilayer pavement block was such that the surface layer was white and the bulk layer was reddish brown. When the physical properties of this multilayer pavement block were measured, the block had a bulk specific gravity of 1.7, an apparent porosity of 18%, a water permeability of 1.5 × 10 ^-2 / sec, and a bulk layer of the block having a bulk specific gravity of 1 0.7, bending strength 55 kg / c
m ² , and the compressive strength was 180 kg / cm ² .

[0037]

As can be seen from the results of the above embodiment,
The multi-layer water-permeable pavement block of the present invention has a low bulk specific gravity and light weight by using the porous aggregate A containing a large number of closed cells, has good water permeability, and has clay and glass powder at the joint. And / or by using a mixture of water glass, the bonding strength is large, and even if it is lightweight, sufficiently large strength is obtained practically. If the strength is large, the thickness of the block can be further reduced to further reduce the weight of the block, and because the block is lightweight, the transportation cost of the multilayer pavement block is low, and its workability is good, and it is practically sufficient It is possible to provide an invaluable multi-layer water-permeable pavement block having excellent strength and abrasion resistance and aesthetic appearance. Therefore, according to the production method of the present invention, it is possible to provide a high value-added multi-layer permeable pavement block in which incinerator ash is effectively used, and to remarkably reduce the cost of treating municipal garbage and eventually incinerator ash.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification number Agency reference number FI Technical indication E01C 5/22 C04B 35/00 109 (72) Inventor Masatoshi Hasegawa 1-21 Yoyogi, Shibuya-ku, Tokyo No. 8 Japan Glaze Brick Industry Co., Ltd. (72) Inventor Naotake Kimura 2-6-2 Otemachi, Chiyoda-ku, Tokyo Tokyo Metropolitan Sewer Service Co., Ltd. (72) Inventor Nao Tanabe 2-chome Otemachi, Chiyoda-ku, Tokyo 6-2 Tokyo Metropolitan Sewerage Service Co., Ltd.

Claims (6)

[Claims] 1. A particle diameter of 0.6 m obtained by granulating and burning incinerator ash.
A total of 40 parts by weight of aggregate B obtained by crushing porcelain and / or aggregate C obtained by crushing feldspar is added to at least 60 parts by weight of porous aggregate A having closed cells having an average apparent specific gravity of 1.45 or less at m or more. A mixture E containing clay and glass powder and / or water glass as a bonding portion was mixed with 100 parts by weight of the mixed aggregate D mixed below.
And a mixed powder F that forms a bulk layer by adding 6 to 20 parts by weight of the mixture to a press mold to fill the majority of the volume of the press mold. Mixture E containing clay and glass powder and / or water glass, which are to be joined, is mixed with 100 parts by weight of mixed aggregate G containing at least 80% by weight of aggregate B and / or aggregate C obtained by crushing feldspar. And filling the mixture with a mixed powder H forming a surface layer added by 6 to 20 parts by weight, press-molding the bulk layer and the surface layer integrally, and then firing. . 2. A fired multilayer permeable pavement block having a bulk specific gravity of 1.50 or less and a bending strength of 50 kg / c.
method for producing a multilayer porous pavement blocks according to claim 1 m ² or more. 3. The porous aggregate A has an average particle size of 1.5 to 3 mm.
The method for producing a multilayer permeable pavement block according to claim 1 or 2, wherein the material adjusted to (1) is used as an aggregate of a bulk layer. 4. With respect to 100 parts by weight of the mixed aggregate D in the mixed powder F and 100 parts by weight of the mixed aggregate G in the mixed powder H,
Each of 4 to 5 parts by weight or less of water glass is mixed.
3. The method for producing a multilayer permeable pavement block according to any one of the above items 3. 5. 0.3 to 100 parts by weight of the mixed powder H
The method for producing a multilayer water-permeable pavement block according to any one of claims 1 to 4, wherein 3.0 parts by weight of a pigment is mixed. 6. The method for producing a multilayer permeable pavement block according to claim 1, wherein the calcination is performed at 1030 to 1100 ° C. for 3 hours or more.