JPH10236865A - Paving block low in water absorption and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To produce an inexpensive paving block low in water absorption. SOLUTION: In this method for producing the paving block low in water absorption, a compact obtained by mixing and kneading an aggregate consisting of 10-30wt.% aggregate particle having >=1mm grain size and 90-70wt.% aggregate particle having <=1mm grain size and a binder as an indispensable constituents and subjecting to press forming is burned. In such a case, the binder is either one among (a) a porcelain raw body and either one of a bentonite or a refractory clay or both, (b) a miscellaneous clay and either one of the bentonite or the refractory clay or both and (c) either one of the refractory clay or a fly ash, and a water content of the compact is 3-10wt.%.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is manufactured by reusing materials produced by incinerating, melting, and detoxifying general waste such as municipal waste and industrial waste such as sewage sludge. The present invention relates to a low water absorption block for pavement and a method for producing the same.

[0002]

2. Description of the Related Art In recent years, from the viewpoint of effective use of household waste such as municipal waste and industrial waste such as sewage sludge, for pavement using calcined aggregate detoxified by incineration or the like as a main raw material. Low water absorption blocks are being manufactured.

[0003] As a conventional method for producing such a low water absorption block for pavement, as described in Japanese Patent Application Laid-Open No. 2-175204, for example, a clay made by mixing a calcined aggregate with a plastic clay raw material is used. A method in which soil (moisture content: 16 to 20%) is prepared and wet-molded to a predetermined shape and size is gradually dried and fired, or a calcined aggregate is mixed with a plastic clay material. There is known a method in which a green body (moisture content: 6 to 8%) is formed, and a molded body obtained by dry press molding to a predetermined shape and size is fired.

[0004]

However, in the above-described conventional block manufacturing method, when a plastic clay material is used, the proportion of the calcined aggregate is generally 50 to 50%.
At 60%, the sintering temperature is 1180 ° C., and when the blending ratio of the calcined aggregate is increased, there is a drawback that the strength of the compact becomes insufficient, and the sintering temperature increases, resulting in high energy cost. Was.

According to a conventional block manufacturing method,
Since the hot-load softening of the molded body is weak, it is necessary to use a setter at the time of drying and drying in order to secure the shape accuracy of the molded body at the time of firing, and it is difficult to produce a large pavement low water absorption block. There is a problem that even if the blocks are relatively small, it is difficult to mass-produce them (the production efficiency is extremely poor), which causes a problem of an increase in production cost.

[0006] In particular, according to the conventional manufacturing method by wet molding, in addition to the above-mentioned drawbacks and problems, the flat drying time is required to avoid the occurrence of deformation and cracks due to uneven drying conditions in the drying process after molding. The disadvantage is that the production equipment is extremely inefficient because it has to be very long and take days.
Even if the drying time is sufficiently long, there are many things that cause considerable drying shrinkage, and such drying shrinkage and baking shrinkage at the time of baking are combined, so that there is a large percentage of scratches and out of specification dimensions,
There was a drawback that the yield was really bad.

[0007] Further, according to the conventional manufacturing method by dry molding, since the aggregate and the sintered binder are kneaded and then pressed, the aggregate cannot be evenly dispersed in the mold and the structure of the molded article is uniform. Or the cost is increased due to the need for a setter at the time of firing, resulting in poor productivity, or the bottom of the molded product is welded to the setter, resulting in poor shape accuracy.For example, using waste glass powder as a sintering binder When a molded product is fired with a roller hearth kiln, waste glass powder is vaporized and fused to the mullite ceramic pipe in the kiln, and this mullite ceramic pipe is vitrified and easily breaks. There are various problems, such as the necessity of frequently replacing a mullite ceramic pipe.

The present invention has been completed as a result of intensive studies in view of such circumstances. The purpose of the present invention is to achieve, in particular, effective utilization of calcined aggregates, which are industrial wastes, and large-scale construction. Even a low water absorption block for pavement can be easily and quickly fired with high dimensional accuracy, can be manufactured with good yield, and, for example, a method for manufacturing a low water absorption block for pavement excellent in color changing work efficiency is provided. It is intended to provide a low water absorption block for use at low cost.

[0009]

The gist of the means adopted by the present invention for that purpose is as set forth in the appended claims.

According to the invention as set forth in any one of claims 1 to 5, the calcined aggregate, which is industrial waste material, is first used as a main raw material, so that the waste material can be effectively used.

According to the method for producing a low water absorption block for pavement according to the first aspect of the present invention, an aggregate particle having a particle size of 1 mm or more is used.
Aggregate particles 90 to 30% by weight with a particle size of less than 1 mm
A method for producing a low-water-absorbing block for pavement, comprising mixing and kneading an aggregate comprising 70% by weight and a binder as essential components, and firing a compact formed by press molding, comprising a plastic forming binder and a sintered binder. A) porcelain clay and / or bentonite and / or refractory clay; a) miscellaneous clay and / or bentonite and / or refractory clay; c) one of refractory clay and fly ash. The method for manufacturing a low water absorption block for pavement according to the invention according to claim 2 is a method for manufacturing a low water absorption block for pavement according to claim 1, since these are configured to function synergistically. In the method for producing a block, the aggregate particles having a particle size of less than 1 mm include 15 to 40 parts by weight of aggregate particles having a particle size of 1 to 0.5 mm and a particle size of 0.1 to 0.5 mm. Aggregate grains 15 having a ~0.3mm
40 parts by weight and aggregate particles having a particle size of 0.3 mm or less 15 to 40
It is configured to be a mixed particle with a weight part, and since these are configured to function synergistically, the aggregate or the binder or the above in a mixer, a raw material transfer line, and a hopper of a forming raw material. Since the kneaded material does not adhere stubbornly, it is extremely easy to clean these devices and the like, particularly to clean the production mold. That is, it is possible to reduce the capital investment cost and improve the color changing work.

Further, even if the kneaded material is formed by hydraulic press forming instead of vibration press forming, the aggregate can be formed into a desired shape in a state in which the aggregate is uniformly dispersed in the mold, thereby suppressing generation of noise. . That is, the drying time of the molded product can be shortened, the molded product can be molded as a tightly molded product having a uniform structure, and a final product having excellent mechanical strength can be manufactured.

According to a third aspect of the present invention, in the method for manufacturing a low water absorption block for pavement, the content ratio of the calcined aggregate in the entire low water absorption block is 70 to 95% by weight, and Since the content of the binder is configured to be 30 to 5% by weight,
In addition to the effect obtained by the production method according to claim 1 or 2, particularly, since the content ratio of the aggregate in the entire low-water-absorbing block is increased as compared with the conventional method, the improvement of the recycling rate of industrial waste is improved. It can contribute to cost reduction and can manufacture an inexpensive low water absorption block for pavement.

According to a fourth aspect of the present invention, there is provided a method for manufacturing a low water absorption block for pavement, wherein the refractory clay is made of Kibushi clay, Frogme clay,
Shale clay, or any of waste drugs, or a mixture thereof, characterized in that the miscellaneous clay is any of tile clay, crushed waste mud clay, or Kira clay, or a mixture thereof Since it is a method for producing a low water absorption block for pavement according to any one of claims 1 to 3, in addition to the effect obtained by the method for producing a low water absorption block for pavement according to any one of claims 1 to 3, Waste materials such as waste medicine, crushed stone mud clay and Kira clay can be more efficiently reused as a binder, and environmental destruction caused by clay mining can be prevented. In other words, it is possible to improve the reuse rate of industrial waste and contribute to cost reduction,
Inexpensive pavement low water absorption blocks can be manufactured, and environmental destruction due to clay mining can be prevented.

The method for producing a low water absorption block for pavement according to the invention of claim 5 is such that the molded article is fired in a bare pile without using a setter at the time of firing.
4. In addition to the effect obtained by the method for manufacturing a low water absorption block for pavement according to any one of the above, the setter itself and a setter transport device are not required, thereby reducing capital investment costs and producing the low water absorption block for pavement. Cost reduction can be achieved.

Next, according to the low water absorption block for pavement according to the present invention, industrial waste can be reused. Further, since the clay for clay and the refractory plastic clay mineral are used so as to function synergistically, the clay is mixed in the mixer, the raw material transfer line, and the hopper of the forming raw material. Adhesion can be prevented, and the cleaning of these devices and the like, in particular, the production mold can be cleaned very easily.

Further, since the mixed and kneaded product is formed into a desired shape by hydraulic press forming, unlike the vibration press forming, generation of noise can be suppressed and the aggregate can be formed in a state in which the aggregates are uniformly dispersed in the mold. In addition, the drying time of the molded product can be shortened,
It can be molded as a molded product having a homogeneous structure and good tightness.

That is, the setter itself and the setter transporting device are not required, so that the capital investment cost can be reduced, the workability including the color changing operation can be improved, and the molded product can be used without using the setter. Since it can be fired in a piled state, the production cost of the low water absorption block for pavement can be reduced, and this can be provided at a low cost.

The invention as set forth in claim 8 is that in the low water absorption block for pavement, the content of the aggregate is 70 to 95% by weight and the content of the binder is 30 to 5% by weight based on the entire low water absorption block. %. The invention according to claim 9, wherein in the low-water-absorbing block for pavement, the refractory clay is made of Kibushi clay, Frogme clay, shale clay,
Or any of the waste medicines, or a mixture thereof, and the miscellaneous clay is any of tile clay, crushed waste mud clay, or Kira clay, or a mixture thereof, particularly, Along with improving the recycling rate of waste medicines, crushed stone mud clay, Kira clay, etc.,
Such a low-water-absorbing block for pavement can be provided at a low cost while preventing environmental destruction due to mining of clay.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in more detail with reference to Examples which embody the present invention. However, this is a typical one, and unless it exceeds the gist thereof, the following Examples are used. The present invention is not limited.

First, when the present invention is carried out, aggregates used for manufacturing the low water absorption block for pavement according to the embodiment of the present invention include, for example, tableware, kitchenware, sanitaryware, and the like. This is a crushed material (calcined aggregate) generally called selven, which is obtained by crushing ceramic waste such as defective products and waste materials into fine particles. However, it is generally called slag, which is obtained by crushing waste foundry sand into fine granules, crushing waste generated during clay refining into fine granules, and crushing waste generated by metal refining into fine granules. It is also possible to use powdery and granular waste such as crushed material and crushed material obtained by crushing waste foundry sand into fine particles. When fine grains called calcined aggregates are used as aggregates, the crystallites are not contained in the aggregates at least because they have already been calcined, so that the secondary shrinkage rate is small, so-called cutting. This is preferable in that it is difficult, and that the energy efficiency can be improved by reducing the drying load.

The porcelain clay for the purpose of the present invention is to maintain a predetermined shape of a press-formed product, to melt the aggregate during sintering, to bind the aggregate, and to have a low water absorption having a predetermined porosity and mechanical strength. In order to obtain a functional block, it is preferable to use a glass product waste such as a plate glass or a glass container as a fine powder, but it is also possible to use a fine powdery crushed product obtained by crushing a glass-based waste of an enamel product. In order to minimize the strain generated during firing, it is preferable that the coefficient of thermal expansion of the clay for porcelain is equal to that of the aggregate. Porcelain clay is melted at the time of firing to combine the aggregates,
In order for this bonding to be performed uniformly and for the melting at the time of firing to take a long time and not to increase the energy cost,
It is preferable to prepare fine powder or spray granules having a particle size of 2.0 mm or less.

The refractory clay referred to in the present invention is generally used in the kiln industry having both plasticity and fire resistance properties, which is added to maintain a predetermined shape of a molded product formed by hydraulic press molding. Clay, for example, Kibushi clay, Gairome clay, etc., which can be used alone or in combination.

[0024] The miscellaneous clay referred to in the present invention is commonly used in the kiln industry having both plasticity and fire resistance properties, which is added to maintain a predetermined shape of a molded product formed by hydraulic press molding. And clay, such as tile clay, crushed stone mud clay, and Kira clay, and these can be used alone or in combination.

It is preferable that the amount of the binder used is adjusted so that the water content of the clay becomes about 3 to 10%. If the water content is 3% or less, the shape retention is deteriorated, and if the water content is excessive, defects such as lamination of the molded product and a long time for drying occur.

When performing hydraulic press forming, a mold having a prescribed size is filled with a prescribed amount of kneaded clay, and the pressure is set to 100 kgf / c.
Press and mold at a pressure of at least m ² . Molding pressure is 100k
If it is less than gf / cm ² , the compaction of the kneaded clay will be poor, and the strength of the molded product will be insufficient. If an excessively high press pressure is required, the mold is severely worn, lamination is likely to occur on the molded body, and economical problems such as an increase in equipment cost arise.

The molded article may be dried by any method such as natural drying, hot-air drying, microwave drying, and high-frequency drying. However, excessively rapid drying may cause so-called cuts or explosions in the molded article. If the drying is performed slowly, disadvantages such as an excessively long drying time may occur.

The molded article is fired at a temperature of 850 to 1350 ° C. The firing furnace may be either a batch furnace or a continuous furnace, but generally a tunnel kiln or a roller hearth kiln is often used. The fact that it can be fired using a roller hearth kiln and that the molded article can be fired in a setter-less state (as it is in a multi-stage bare state)
This is one of the exceptionally remarkable functions and effects of the present invention not found in the conventional manufacturing method.

Next, it is needless to say that the size and appearance of the low-water-absorbing block for pavement manufactured by the manufacturing method of the present invention are not limited, and that the design is appropriately changed.

When the total thickness is less than 20 mm, the strength is low, and there is a concern that the stability after construction may be deteriorated. On the other hand, when the total thickness is more than 100 mm, the weight becomes heavy and the workability becomes poor. There is a concern that a disadvantage of worsening may occur.

The length of one side is about 90 to 500 mm. If the length of one side is 90 mm or less, there is a disadvantage that productivity and workability are deteriorated. Also, 500
If it is not less than mm, the weight becomes heavy and the workability deteriorates.

[0032]

EXAMPLE 1 20% by weight of crushed porcelain aggregate having a particle size in the range of 3.0 to 1.0 mm, and 55% of crushed porcelain aggregate having a particle size in the range of 1.0 to 0.3 mm. Aggregate consisting of 25% by weight of a crushed porcelain aggregate having an average particle size of less than 0.3 mm is 25% by weight, a porcelain clay having a content of 15% by weight, and a content of 3% by weight. The kneaded clay obtained by adding and kneading bentonite to be a weight% as a binder (forming aid) is formed under a pressure of 200 kgf / cm ² using a hydraulic press forming machine, and after drying the formed product, The moldings adjacent to each other are piled up in six levels so as not to come into contact with each other while bare without using a so-called setter.
It was baked continuously at 00 ° C for 17 hours. The shape of the final product is a rectangle having a length of 230 mm, a width of 115 mm, and a thickness of 50 mm. The properties of the final product are shown in Table 1.

Example 2 20% by weight of crushed porcelain aggregate having a particle size in the range of 3.0 to 1.0 mm, and 55% by weight of crushed porcelain aggregate having a particle size in the range of 1.0 to 0.3 mm %, An aggregate comprising 25% by weight of a crushed porcelain aggregate having an average particle diameter of less than 0.3 mm, a clay for porcelain having a content of 15% by weight with respect to the whole, and a content of 3% by weight with respect to the whole % Of bentonite and 5% by weight of Kibushi clay with respect to the whole are added as a binder (forming aid) and kneaded to obtain a kneaded clay of 200 kgf / cm ² using a hydraulic press molding machine. After the molded article is dried under pressure of 6 mm, the molded articles adjacent to each other are piled up in six stages so as not to come into contact with each other while being naked without using a so-called setter.
It was baked at 00 ° C. for 10 hours continuously. The shape of the final product is a rectangle having a length of 230 mm, a width of 115 mm, and a thickness of 50 mm. The properties of the final product are shown in Table 1.

Conventional Example 1 80% by weight of crushed porcelain aggregate having an average particle size in the range of 3.3 to 1.0 mm, and 8 in the porcelain crushed aggregate having an average particle size of 1.0 to 0.5 mm. Clay obtained by adding and kneading a ceramic clay having a content of 60% by weight to the aggregate comprising 12% by weight of porcelain crushed aggregate having an average particle size of less than 0.5 mm, 200k using hydraulic press molding machine
After being molded under a pressure of gf / cm ² and drying the molded product, it was continuously baked at 1250 ° C. for 30 hours using a so-called setter. The shape of the final product is a rectangle having a length of 230 mm, a width of 115 mm, and a thickness of 50 mm. The properties of the final product are shown in Table 1.

Table 1 Example 1 Example 2 Conventional Example 1 Firing shrinkage,% 2.5 1.5 6.0 Water absorption,% 1.5 2.5 0.5 Flexural strength, kgf / cm ² 160 140 170 Flexural strength was measured according to JIS R2213. . The water absorption was measured according to JIS A5209.

According to the manufacturing methods of the first and second embodiments,
A large-sized pavement low-water-absorbing block that could not be manufactured by the conventional manufacturing method can be manufactured with high dimensional accuracy and can be provided at a low cost. This point is one of the remarkably remarkable functions and effects over the conventional manufacturing method.

The manufacturing method of each of the above embodiments and the low water absorption block for a ceramic pavement manufactured by this manufacturing method are described as typical embodiments of the present invention. The present invention is not limited to this, and can be implemented by appropriately changing the design without departing from the spirit of the present invention when implementing the present invention.

[0038]

As described above, according to the method for producing a low water absorption block for pavement of the present invention, the following remarkable functions and effects can be obtained.

First, according to the production method according to the first to fifth aspects of the present invention, since calcined aggregate, which is industrial waste material, is used as a main raw material, such waste material can be effectively used.

Next, the inside of the mixer, the raw material transfer line,
And since the aggregates and binders or kneaded materials thereof do not adhere stubbornly in the hopper of the molding raw material,
Cleaning of these devices and the like, in particular, cleaning of the manufacturing mold becomes extremely easy. That is, it is possible to reduce the capital investment cost and improve the color changing work.

Also, even if the kneaded material is not subjected to vibration press molding but to hydraulic press molding, the aggregate can be formed into a desired shape in a state where the aggregate is uniformly dispersed in the mold, thereby suppressing generation of noise. That is, the drying time of the molded product can be shortened, the molded product can be molded as a tightly molded product having a uniform structure, and a final product having excellent mechanical strength can be manufactured.

In particular, according to the manufacturing method of the third aspect of the present invention, the content ratio of the calcined aggregate in the whole low water absorption block is 70 to 95% by weight, and the binder in the whole low water absorption block. 3. The composition according to claim 1, wherein the content is 30 to 5% by weight.
In addition to the effects obtained by the manufacturing method described in the above, in particular, since the content ratio of the aggregate to the entire low water absorption block is increased from the conventional, it is possible to improve the recycling rate of industrial waste It can contribute to cost reduction and can manufacture an inexpensive pavement low water absorption block.

According to the production method according to the fourth aspect of the present invention, in addition to the effects obtained by the method for producing a low-water-absorbing block for pavement according to any one of the first to third aspects, it is also possible to use a waste medicine, Waste such as crushed stone mud clay and Kira clay can be more efficiently reused as a binder, and environmental destruction caused by clay mining can be prevented. In other words, it is possible to improve the reuse rate of industrial waste, contribute to cost reduction, manufacture a low-cost pavement-use low-water-absorbing block, and prevent environmental destruction caused by clay mining.

According to the fifth aspect of the present invention, the molded article is fired in a bare pile without using a setter at the time of firing. In addition to the functions and effects obtained by the method of manufacturing the low water absorption block, the setter itself and the setter conveying device are not required, so that the capital investment cost can be reduced and the production cost of the low water absorption block for pavement can be reduced.

Next, according to the low water absorption block for pavement according to the sixth to ninth aspects, the following particularly remarkable effects can be obtained.

First, according to the low water absorption block for pavement according to the invention of claims 6 to 9, since calcined aggregate, which is industrial waste material, is used as a main raw material, such waste material can be effectively used.

Further, since the porcelain clay and the refractory plastic clay mineral are used so as to function synergistically, the clay, the raw material transport line, and the hopper for the forming raw material are provided in the mixer. The kneaded clay can be prevented from adhering,
Cleaning of these devices and the like, in particular, cleaning of the production mold can be performed very easily, and workability including color changing work can be improved. That is, the manufacturing cost can be reduced.

Further, since the mixed and kneaded material is formed into a desired shape by hydraulic press molding, unlike the vibration press molding, the generation of noise can be suppressed and the aggregate can be formed in a state where the aggregates are uniformly dispersed in the mold. . That is, the drying time of the molded article can be shortened, the molded article can be molded as a well-tightened molded article having a uniform structure, and the setter itself and the setter transport device are not required, so that the capital investment cost can be reduced. Since the molded article can be fired in a bare pile without using a setter, the production cost of the low water absorption block for pavement can be reduced, and these can be provided at low cost.

In particular, in the low water absorption block for pavement according to claim 8, the content ratio of the aggregate to the entire low water absorption block is 7%.
0 to 95% by weight, and the content of the binder is 3%.
Since the amount of the refractory clay is 0 to 5% by weight, the refractory clay may be any of Kibushi clay, Frogme clay, shale clay, or waste wax, or a combination thereof. It is a mixture, and said miscellaneous clay is any of tile clay, crushed stone waste mud clay, or Kira clay, or a mixture thereof. It is possible to provide an inexpensive pavement low water absorption block while improving the recycling rate of waste such as waste mud clay and Kira clay and preventing environmental destruction due to clay mining.

Continued on the front page (51) Int.Cl. ⁶ Identification code FI E01C 5/22 E01C 5/22

Claims (9)

[Claims] 1. Aggregate particles 10 to 3 having a particle size of 1 mm or more.
Aggregate consisting of 0% by weight and 90-70% by weight of aggregate particles having a particle size of less than 1 mm and a binder are mixed and kneaded as essential components, and a low water absorption for pavement is obtained by firing a compact formed by press molding. The method for producing a block, wherein the binder comprises: a) clay for porcelain, and either or both of bentonite and refractory clay; a) miscellaneous clay and either of bentonite or refractory clay; or C) production of a low-water-absorbing block for pavement, characterized in that the molded article is any one of fire-resistant clay and fly ash, and the moisture content of the molded body is 3 to 10% by weight. Method. 2. The method for producing a low water absorption block for pavement, wherein the aggregate particles having a particle size of less than 1 mm have a particle size of 1 to 0.5.
15 to 40 parts by weight of aggregate grains having a particle size of 0.5 to 0.5 mm
The low water absorption block for pavement according to claim 1, characterized in that it is a mixture of 15 to 40 parts by weight of aggregate particles having a diameter of 0.3 mm and 15 to 40 parts by weight of aggregate particles having a particle size of 0.3 mm or less. Manufacturing method. 3. The method for producing a low water absorption block for pavement according to claim 3, wherein a content ratio of the aggregate to the entire low water absorption block is 7%.
The method for producing a low water absorption block for pavement according to claim 1, wherein the content is 0 to 95% by weight, and a content ratio of the binder to the entire low water absorption block is 30 to 5% by weight. 4. The method for producing a low water absorption block for pavement, wherein the refractory clay is any one of Kibushi clay, Frogme clay, shale clay, and waste wax, or a mixture thereof. The method for producing a low-water-absorbing block for pavement according to any one of claims 1 to 3, wherein the clay is any one of clay for tile, crushed stone waste clay, and Kira clay, or a mixture thereof. 5. The method for producing a low-water-absorbing block for pavement, wherein the step of firing the formed body is setterless (laminated).
The method for producing a low water absorption block for pavement according to any one of claims 1 to 4, wherein the method is performed. 6. Aggregate particles 10 to 3 having a particle size of 1 mm or more.
An aggregate comprising 0% by weight and 90-70% by weight of aggregate particles having a particle size of less than 1 mm and a binder are mixed and kneaded as essential components, and then pressed and molded to have a water content of 3 to 10% by weight. A low-water-absorbing block for pavement obtained by firing C) any one of refractory clay or fly ash, wherein the low water absorption block for pavement has a water absorption of 5% or less. Low water absorption block for paving. 7. The low water absorption block for pavement, wherein the aggregate particles having a particle size of less than 1 mm have a particle size of 1 to 0.5.
15 to 40 parts by weight of aggregate grains having a particle size of 0.5 to 0.5 mm
The low water absorption block for pavement according to claim 6, wherein the mixture is a mixture of 15 to 40 parts by weight of an aggregate particle having 0.3 mm and 15 to 40 parts by weight of an aggregate particle having a particle size of 0.3 mm or less. . 8. The low water absorption block for paving, wherein the content ratio of the aggregate to the entire low water absorption block is 7%.
0 to 95% by weight, and the content of the binder is 3%.
The low water absorption block for pavement according to claim 6 or 7, wherein the content is 0 to 5% by weight. 9. The low water absorption block for pavement, wherein the refractory clay is any of Kibushi clay, Frogme clay, shale clay, or waste wax, or a mixture thereof, and the clay is tile. The low water absorption block for pavement according to any one of claims 6 to 8, wherein the block is any one of clay for use, crushed waste mud clay, and clay for clay, or a mixture thereof.