JPH10231155A - Production of ceramic aggregate grain - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for producing ceramic aggregate grains having the whole indeterminate appearance shape of a nearly polyhedron or a nearly convex polyhedron and all of the respective rounded sides and apices of the polyhedron (without being sharply pointed) and uneven rough surfaces of the respective faces, and by the method defectives of ceramics and industrial waste materials are effectively utilized in order to maintain the protection of natural environments and water absorption coefficient or color tone can wholly be controlled. SOLUTION: The ceramic aggregate grains having the whole indeterminate appearance shape of a nearly polyhedron or a nearly convex polyhedron, the respective rounded sides and apices of the polyhedron (without being sharply pointed) and uneven rough surfaces of the respective faces are produced. Water is especially added to mix or knead the respective raw materials and the resultant kneaded material is formed. The prepared formed material is pulverized and the pulverized material is sieved to afford an indeterminate nearly polyhedral or a convex polyhedral shape having a grain size within a desired prescribed range, which is then baked.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing ceramic aggregate particles, and more particularly, to a substantially polyhedron or a substantially convex polyhedron having an irregular overall appearance, wherein each side and each side of the polyhedron are formed. It is an object of the present invention to provide a method for producing ceramic aggregate particles characterized in that all the tops are rounded (not sharp) and each surface is roughened.

[0002]

2. Description of the Related Art Conventionally, various types of ceramic aggregate particles have already been developed, and in particular, diffuser plates and diffusers in closed water areas such as permeable tiles, permeable blocks, permeable cylinders, permeable casings, and culture ponds. It is widely used as a raw material for manufacturing cylinders, filters, adsorbents, sound-absorbing materials, bacterial bed materials, and the like.

Meanwhile, as a conventional method for producing ceramic aggregate particles, as shown in Japanese Patent Publication No. 56-19308,
A material obtained by mixing pigments and the like in advance into a ceramic material is formed into a block shape like a brick, fired, and the obtained fired body is roughly crushed by a crusher such as an invera breaker or a jaw crusher. Crushing waste materials such as insulators using a crusher such as an impeller breaker or jaw crusher, and then sieving to obtain white ceramic aggregate particles having a predetermined particle size. Are known. In addition, crushed ceramic particles discarded as industrial waste have been used as aggregates as they are.

[0004] Further, for example, a crushed material generally called selven, which is obtained by crushing defective products such as tableware, kitchenware, sanitaryware, insulators and burned material waste such as waste material into fine particles, is used as a starting material. Ceramic aggregate particles are also known,
As a method for producing these ceramic aggregate particles, first,
Mix the desired inorganic pigments and various binders in Cerben, usually kneaded material imparted moldability or plasticity by adding and mixing and kneading a solvent such as water,
Then, extrusion molding into pellets or coarse corners, drying, baking, pulverizing, classifying, spray granules, press molding the spray granules, drying, baking, pulverizing, classifying, A method is known in which a spray granule is produced, and a molded product obtained by press-molding the spray granule is dried, pulverized, classified, and fired.

[0005]

However, the above-mentioned aggregated granules obtained by pulverizing ceramics have sharp edges, each vertex of which is sharp, or each side has an acute edge like the tip of a blade. Because the surface of the crushed particles obtained from completely porcelain like insulators is slippery and slippery, it was constructed using these ceramic aggregate particles, for example. The pavement has a problem with respect to the safety of running a car and pedestrians.

[0006] In the case of a block-shaped molded body once fired, a difference in the degree of firing in the block often occurs due to heat conduction. Thus, even in the case of aggregate particles of the same lot, a large difference in water absorption rate between the aggregate particles often occurs.

Further, the crushed grains obtained from the block-shaped porcelain once fired or in a state close to the porcelain cannot not only totally control the color tone between the aggregate grains, but also produce the same aggregate grains. There is a drawback that the appearance after finishing is poor because the color tone of the surface cannot be controlled.

In addition, since the whole of the crushed granules tends to be thin and elongated in appearance, the mixture of concrete and asphalt concrete increases the porosity between aggregate particles (reduces the performance ratio). ,
There is a problem that the amount of unit water and asphalt used is uneconomical, and furthermore, if there are many thin and elongated aggregate grains, in the case of asphalt concrete, poor leveling and compaction during construction are likely to occur, In the case of concrete, since the water-cement ratio is constant in order to obtain the target strength, the unit water amount must be increased, the unit cement amount increases (the amount of mortar increases), and shrinkage cracks after hardening. This is problematic in that beans easily occur and bean boards are easily formed because compaction is difficult.

Further, when, for example, a water-permeable block is manufactured using aggregate particles obtained by directly firing, pulverizing, and classifying the compact, small aggregate particles are interposed between aggregate particles having large particle diameters. Therefore, there is a problem that the water permeability is reduced.

Further, in the case of crushing once sintered porcelain or a porcelain that has been brought into a state close to it, and then sieving it to obtain a large amount of ceramic aggregate particles having a desired particle size,
It is necessary to treat a considerable amount of waste such as fired fired products, and at the time of crushing, a large amount of small crushed material containing a particle size other than a predetermined one, particularly a fine particle, is generated and mixed as it is. Therefore, for example, there is a problem that the adhesive strength with asphalt concrete is significantly reduced.

The present invention has been devised in view of the above-mentioned circumstances, and an object thereof is to provide a substantially polyhedron or a substantially convex polyhedron whose overall appearance is indefinite, wherein each side of the polyhedron has It is intended to provide a method for producing a ceramic aggregate particle having a constitutional feature in which each apex is rounded (not sharp) and the surface of each surface is roughened. is there.

Another object of the present invention is to effectively use defective ceramic products and calcined industrial waste materials to conserve the natural environment.

[0013]

The gist of the means adopted by the present invention to achieve the above object is as described in the appended claims.

The gist of the present invention is that a general polyhedron or a convex polyhedron whose overall appearance is indefinite is formed such that each side and each top are rounded (not sharp) and each A method for producing ceramic aggregate particles having a roughened surface, comprising the following steps: a) a step of adding water to each raw material and mixing and kneading to obtain a kneaded product; A) a step of pulverizing a molded body formed by molding the obtained kneaded material, c) a step of sieving the pulverized product obtained in the pulverizing step, d) a firing step of firing the sieve residue, e) Crushing the fired product. "

The gist of the present invention is that a general polyhedron or a convex polyhedron whose overall appearance is indefinite is formed, each side and each apex of which is rounded (not sharply pointed) and A method for producing ceramic aggregate particles having a roughened surface, comprising the following steps: a) adding water to each raw material and mixing and kneading to obtain a kneaded material; A) a step of granulating the obtained kneaded product, c) a step of sieving the granulated product obtained in the granulation step, d) a firing step of firing the sieve residue, e) the fired product Of disintegrating. "

The gist of the third invention is that "in the method for producing ceramic aggregate particles, a material having passed through a sieve obtained in a step of sieving the granulated substance obtained in the granulating step (net-under product). 3. The method according to claim 1, further comprising a step of returning to the step of adding water to each raw material, mixing and kneading to obtain a kneaded material, as described in a) above. Manufacturing method ". The gist of claim 4 is that the entire appearance is a substantially polyhedron or a convex polyhedron whose shape is irregular and each side and each apex are rounded (not sharp) and the surface of each surface is not sharp. Is a method for producing ceramic aggregate particles having a roughened surface, comprising the following steps: a) a step of adding water to each raw material and mixing and kneading to obtain a kneaded product; Extruding the obtained kneaded product to obtain a molded product, c) firing the molded product, d) pulverizing the obtained fired product, e) screening the obtained ground product. F) a step of abrading so as to round off both sides and vertices of the sieve residue obtained in the classifying step. "

According to a fifth aspect of the present invention, there is provided a substantially polyhedral or convex polyhedron having an irregular outer shape, each side and each apex of which is rounded (not sharply pointed) and A method for producing ceramic aggregate particles having a roughened surface, comprising the following steps: a) adding water to each raw material and mixing and kneading to obtain a kneaded material; A) a step of molding the obtained kneaded material to obtain a molded body, c) a step of firing this molded body, d) a step of pulverizing the obtained calcined product, e) a pulverized product obtained And a step of abrading to round both sides and apex. F) Classifying the pulverized material obtained in the abrasion step. "

According to a sixth aspect of the present invention, there is provided a method for producing a ceramic aggregate particle, wherein the ceramic aggregate particle has a particle diameter within a desired predetermined range and is not rounded (sharply pointed). The ceramic bone according to any one of claims 1 to 5, wherein the ceramic aggregate grains B having sides or tops are blended so that a blending ratio of the whole to 40% by weight or less. Method of manufacturing grain. "

First, according to the method for manufacturing ceramic aggregate particles according to the first to sixth aspects, each side and each apex of the substantially polyhedron or the convex polyhedron whose overall appearance is indefinite are rounded ( It is possible to reliably produce ceramic aggregate particles that are not sharply sharpened) and have rough surfaces on each surface.

In the method for producing ceramic aggregate particles according to the first to third aspects, a kneaded product formed by adding water to each raw material and mixing and kneading the resulting mixture is pulverized. Since the strength is large, the crushed product is baked after being sieved into an amorphous polyhedron or convex polyhedron having a particle size within a desired predetermined range,
Even if each apex of this crushed material is sharply pointed or each side is a sharp edge like the tip of a cutting tool, all of them should be melted and fixed in a rounded sharp non-pointed state in the firing process. In addition, the surface shape can be made a rough surface shape with irregularities.

Further, according to the method for manufacturing ceramic aggregate particles according to the first to third aspects, the processing cost for pulverizing a hard fired product is inexpensive as compared with the conventional manufacturing method of pulverizing after firing. Therefore, the manufacturing cost can be reduced.

According to the third aspect of the present invention, the method for producing ceramic aggregate particles is configured such that the material passed through the sieve (mesh product) generated in the sieving step is returned as the raw material. It can be used up to the end, and the reduction of the pulverization processing cost can further reduce the production cost.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the method for producing ceramic aggregate particles of the present invention will be described in more detail with reference to Examples. The present invention is not limited by the following examples as long as the value does not exceed.

First, the ceramic aggregate particles according to the present invention can be used for ceramic waste such as feldspar and pottery stone, general-purpose tile clay, or industrial waste such as defective ceramic products and waste. This ceramic aggregate is used to produce, for example, construction materials such as permeable pavement materials, road hearths, permeable bricks, blocks, and tiles, civil engineering materials, and porous ceramic products. Alternatively, a filter material or the like is manufactured.

The industrial waste is a crushed material generally called a selven, which is obtained by crushing waste products such as tableware, kitchenware, sanitaryware, insulators, and burned materials such as waste materials into fine particles. Crushed fine powder, crushed crushed tiles, blast furnace slag crushed fine powder, municipal garbage incinerated ash slag crushed fine powder, tile chamotte, crushed calcined aggregates such as sewer incinerated ash These may be used alone or in combination of two or more.

In addition, the calcined aggregate is crushed into fine granules by crushing concrete cement produced by demolishing a concrete cement structure or building, and crushed into fine granules by crushing waste casting sand. Crushed waste produced during scouring and made into fine granules Generally, crushed material called Kira, crushed waste produced by metal scouring made into fine granules, generally crushed material called slag, and fine granulated by crushing waste molding sand Can be mixed with
Further, the coloring may be adjusted by adding a desired pigment.

In particular, the above-mentioned selben is a pulverized product of a calcined calcined product, so that it is inexpensive, easily and stably available, and its quality is relatively stable, and many of them have satisfactory mechanical strength. In addition, when a mixture obtained by mixing any of the finely divided crushed material raw materials other than the selven so as to have a content of 30% by weight or more with respect to the whole is used as the raw material, the mechanical strength is improved. Can be. In particular, it is preferable to mix a glass-based selven or an appropriate amount of alumina, because the mechanical strength can be further improved.

Further, it can be manufactured by using selven, concrete, silica sand as a raw material and using a crushed glass waste material as a secondary binder. Among such ceramic aggregate particles, a machine using selven is used. The ultimate strength (compression strength) is the best.

Preferably, the surface roughness of the ceramic aggregate particles is preferably a granular sandstone (the third particle shown in BS 812).
Group) or basalt is a typical coarse type (No. 4 shown in BS 812)
Group). The reason for this is that the adhesiveness to mortar, asphalt, and resin can be further improved by forming the surface with the aggregate particles having such a roughness.

The ceramic aggregate particles are mixed with other ceramic aggregate particles B having a predetermined diameter within a desired range and having each side and each top not rounded (sharp). It is preferred that the ceramic aggregate particles of the present invention contain at least 60% by weight or more in weight ratio,
It is more preferable that the content be at least 10% by weight.

The ceramic aggregate particles according to the present invention use industrial wastes such as defective ceramic products and calcined wastes as one of the main raw materials. It is possible to reduce the rate (increase the actual rate), achieve high quality without any color tone and color unevenness, and in the case of construction, material separation hardly occurs in the case of concrete, so defects such as beans In the case of asphalt concrete, it is possible to improve the leveling and compaction properties of the asphalt concrete, and it has excellent adhesion to asphalt, mortar and resin. , And
The feature is that the display pavement has excellent durability and is useful for improving the landscape of the surrounding environment.

Further, in order to make asphalt concrete, concrete and resin pavement excellent in economy and durability, it is necessary that the aggregate appearance of the aggregate particles is not a perfect sphere or an elliptical sphere but is thin and flat. It is preferable that the aggregate is composed of no aggregate particles, and it is preferable that the aggregate particles include at least 80% or more by weight.

That is, by making the shape of the aggregate thin and not flat, that is, by reducing the porosity between the aggregates (increase the actual ratio), the unit water amount of the concrete is not increased, and the asphalt is not increased. Since the amount of asphalt in the concrete does not need to be increased, the adhesiveness with the resin can be improved.

In addition, in the case of construction, material separation hardly occurs in the case of concrete, so that defects such as bean boards hardly occur. In the case of asphalt concrete, there is an advantage that leveling and compaction can be improved. There is.

Hereinafter, with respect to the method for producing the above-mentioned ceramic aggregate particles, the following representative production methods (1) to (3) will be described in detail. (1) First, although the main raw materials of the ceramic aggregate particles have been described above, they will not be repeated, but the composition thereof is not particularly limited.

Examples of the equipment for adjusting the water content of the raw materials include mortar mixers, concrete mixers, and general stirring mixers such as edge runners and Eichlic mixers. Mixers are preferred because they are excellent in terms of stirring and mixing ability, and when water is adjusted by adding water, it is preferable to add water in a spray or shower state, since water can be uniformly dispersed and mixed. The water content of the mixture after adjusting the water content is preferably 3 to 20%, preferably 5 to 20%.
It is more preferable that the content be 15% or less.

Next, the mixture whose water content has been adjusted is formed into a block or a plate by a press machine. As the press, it is sufficient to use a known hydraulic press. At this time, the thickness of the press-formed body is one of the maximum size of the aggregate particles in consideration of the shrinkage ratio after firing.
It is preferable to set it to 100 to 300%,
% Is more preferable.

Next, the press-formed body is placed between a wire mesh, an iron plate or the like having a large number of grids larger than the maximum size of the aggregate particles in consideration of the shrinkage ratio after firing and a pressing machine to form an aggregate. Mold into At this point, all the particles have already reached the desired maximum size, but because they are pressed to the grid with some water content, their shape is less likely to form sharp edges or become thin and flat. In addition, fine irregularities can be formed on the surface.

As a press at this time, a known flat press,
A roll press or the like can be used, and the linear pressure may be such that the press-formed body can pass through the grid.

Even if the primary dried extruded body is crushed by a crusher typified by a jaw crusher or an impeller breaker, the primary dried extruded body contains a suitable amount of water. The shape must not have sharp edges as in the case of crushed fired material, or become thin and flat, and easily form many fine irregularities on each surface of the aggregate. Can be.

The particles thus shaped are sieved with a sieve having the minimum size of the aggregate in consideration of the shrinkage rate after firing, and the small-diameter particles passing through the sieve are returned to the water adjustment step and reused. It has become. Therefore, it is not fired with the particle groups having a predetermined size or less mixed.

On the other hand, the particles remaining on the sieve are fired, for example, using a known gas furnace or electric furnace while being housed in a refractory vessel, and then the partially welded aggregates are separated by a known crusher. Use and unravel.

When the water content of the particles remaining on the sieve is high, it is preferable to dry the particles before firing. The firing temperature varies depending on the characteristics of the raw material used and the target water absorption, but when the aggregate is selven alone, 700 to 1300
℃, 500 to 1 when crushed powder of slag or iron-based waste material is used together
About 200 ° C. is preferable. When a fired product is used as the aggregate, a firing time of about 1 to 3 hours is sufficient.

The water absorption of the aggregated particles after firing is preferably 3%.
Or less, more preferably 2% or less. If the water absorption is more than 3%, the abrasion resistance of the aggregate particles themselves will be reduced, and when used as aggregate particles of concrete, a part of the water mixed with the aggregate will be temporarily absorbed. Due to this, the slump decreases and the workability deteriorates, and construction defects are likely to occur.On the other hand, when used as aggregate particles of asphalt concrete, a large amount of drying energy of the aggregate particles before mixing is required. Become.

Further, since such a particle group has already been formed into particles at the time of firing, a block or plate is fired.
Since the degree of firing can be made uniform as compared with the crushed aggregate particles, the difference in water absorption between the ceramic aggregate particles is extremely small.

(2) Next, the other method for producing a ceramic aggregate of the present invention is particularly suitable for a method for producing a ceramic aggregate having a maximum dimension of 30 mm or less, and the ceramic raw material is the same as described above. The composition is not particularly limited, and each may be used alone or in combination of two or more. In some cases, coloring is adjusted by adding a pigment to these ceramic raw materials.

The water content of the ceramic raw material is preferably 10 to 30%, more preferably 15 to 25%.

First, this ceramic material is extruded using a known extruder. Next, the extruded product is primarily dried, and its water content is preferably 2 to 15%, more preferably 4 to 10%. This means that if the water content is too low, many small particles containing fine particles will be generated in the crushing step described below, and if the water content is too high, the compact will adhere to the crusher at the time of crushing and the crushing efficiency will increase. descend.

Next, the primarily dried extruded product is crushed by a crusher typified by a jaw crusher or an impeller breaker. At this time, since the primary dried extruded body contains a suitable amount of water, the shape may have sharp edges as in the case of crushing once fired, or it may be thin and flat. In addition, many fine irregularities can be easily formed on each surface of the aggregate.

The crushed and shaped particles are sieved with a sieve having a maximum and a minimum size of the aggregate in consideration of a shrinkage rate after firing, and the particles remaining on the sieve having the maximum size are subjected to a process of crushing again to a minimum size. After passing through the sieve, the extruded product is returned to the step of making it and reused. Therefore, the particles are not fired while the particle groups having a predetermined size or less are mixed.

On the other hand, a group of particles having a desired particle size is fired in a refractory container, for example, using a known gas furnace or electric furnace, and then partially fired, as in the case of the above (1). Aggregates welded to each other are crushed using a known crusher. The firing temperature varies depending on the characteristics of the raw material used and the target water absorption rate.
500 ° C, 500 when combined with crushed powder of slag and iron-based waste
A temperature of about 1,200 ° C. is preferred. When a fired material that has been fired is used as the aggregate, the holding time of the firing temperature is 1 to 3.
About an hour is enough. The water absorption of the aggregated particles after firing is preferably 3% or less, and more preferably 2% or less, for the same reason as described above.

Also in this method, since the particles are already formed at the time of firing, the difference in water absorption between the particles is extremely small.

(3) Next, in the method for producing other ceramic aggregate particles of the present invention, the ceramic raw material is the same as in the above (1) and (2), and the composition is There is no particular limitation, and each may be used alone, or two or more types may be used in appropriate combination. In some cases, coloring is adjusted by adding a pigment to these ceramic raw materials. The water content of the raw material is preferably 10 to 3
0%, more preferably 15 to 25%.

The raw material is formed into an extruded product by using a known extruder having a die having an extruded product having a non-equilateral polygonal shape. The shape of the aggregated particles after firing is determined to some extent by the cross-sectional shape of the extruded product. When the cross-sectional shape of the extruded body becomes a shape close to a circle, the meshing effect of the aggregates after firing is reduced, and therefore, preferably, the unequal sides 5 to 5 are used.
It is preferable to mount an octagonal base, and it is more preferable to mount a plurality of bases having different cross-sectional shapes and cross-sectional dimensions. Furthermore, it is also possible to form such that fine dovetails or grooves are formed on the surface of the molded body at the time of extrusion molding, whereby the adhesive force of the aggregate can be further increased.

When the extruded product comes out of the die, the extruded product is cut with a wire or the like into a desired predetermined cutting length in accordance with the cross-sectional dimension of the extruded product. That is, before firing
By making the aggregate grains, the overall appearance of the aggregate grains after firing is not a perfect sphere or an elliptical sphere and is not thin and flat, and may be an aggregate grain within a desired predetermined range. it can. That is, by appropriately setting the cross-sectional shape, cross-sectional dimension, and cutting length of the die, it is possible to form an aggregate having a desired size and shape.

The cut extruded product piece is placed in a fireproof container and fired using, for example, a known tunnel kiln.
If a known crusher is used, partially fused aggregates can be easily broken. The maximum firing temperature at this time may be set in accordance with the characteristics of the raw materials used in the same manner as described in (1) and (2). The water absorption is preferably 3% or less, and more preferably 2% or less.

As in the production methods (1) and (2),
Since the particles are already formed at the time of firing, the difference in water absorption between each particle is extremely small compared to the particles obtained by firing and crushing blocks or plates, and surface roughness, shape and water absorption stability. Can be manufactured.

As described above, the ceramic aggregate particles of the present invention have an appropriate roughness (fine irregularities) on the surface, and the overall appearance of the ceramic aggregate particles is not a perfect sphere and is not thin and flat. In the case where conventional asphalt concrete is used, when the ceramic aggregate particles are mixed and used preferably in a weight ratio of preferably 80% or more, the ceramic aggregate particles have excellent adhesion to asphalt. Since the porosity between the aggregates is small, the amount of asphalt to be used can be small, and it can be easily spread and rolled during construction.

Also, when used for concrete, the adhesiveness to mortar is excellent, and the porosity between aggregates is small, so that only a small amount of water is required, the shrinkage fluctuation after hardening is small, and compaction is performed. It is difficult to cause poor construction such as bean boards.

Next, the method for producing ceramic aggregate particles of the present invention is a rational method in which a molded body having unnecessary dimensions is reused before firing, and a desired predetermined dimension is obtained. Because only the molded body is fired, it is said that both sides and vertices of the molded body are not melted and sharply sharpened, particularly in terms of surface roughness having fine irregularities. In terms of shape, ceramic aggregate particles can be produced which are excellent in that the water absorption of the aggregate itself is uniform and stable.

Incidentally, the pavement structure having the display pavement constructed using the ceramic aggregate particles of the present invention has both the above-described ceramic aggregate particles and the aggregate mixed with asphalt concrete or concrete. The display identification section is constructed by combining them as appropriate. That is, the main body of the pavement structure is either the former or the latter. Therefore, when the display identification portion is the former (ceramic aggregate particles), the fabric, that is, the entire pavement is mixed with the latter (asphalt concrete or concrete). However, it is preferable that the display identification portion is made of a mixture of both, because the durability can be improved.

When constructing a display pavement using asphalt concrete, a roll door asphalt concrete, an open grain asphalt concrete, or a normal dense asphalt concrete is used by using ceramic slur aggregate for all or a part of the aggregate. It can be constructed with fine, coarse or fine asphalt concrete. It does not limit the type of aggregate particles to be blended and the method of construction of the display pavement, but when the display pavement is constructed by a construction method called roll door asphalt concrete, or by using a discarded formwork or weir board It is preferable that the display pavement is constructed and the surface of the pavement is shot blasted, since the color of the ceramic aggregate particles can be displayed on the display identification portion formed on the pavement at the same time as the completion of the construction.

The asphalt concrete using the ceramic aggregate particles of the present invention may be mixed with fillers such as sand and limestone powder.

Next, when the display pavement is constructed by using concrete, it can be constructed and displayed by using the ceramic aggregate particles for all or a part of the aggregate particles. As an example of a concrete construction method, concrete mixed with ceramic aggregate grains is poured into a formwork arranged in a form to be displayed, cured, demolded, and then around the ceramic aggregate. An example is a construction method in which concrete containing an aggregate other than grains is cast and hardened. Before the concrete mixed with ceramic aggregate particles is completely hardened (during the curing period), the surface mortar can be removed in the same manner as for the washed concrete, or the surface can be shot blasted after the concrete has completely hardened. By performing the processing, the display identification portion formed on the pavement can be displayed in the same display color as the color of the ceramic aggregate particles.

When constructing a concrete pavement in which a concrete body containing ceramic aggregate particles and concrete containing aggregate particles other than the ceramic aggregate particles are integrally formed, reinforcing steel bars such as tie bars are arranged. This is preferable because the mechanical strength can be enhanced.

The display pavement thus constructed is:
Since the color of the ceramic aggregate incorporated in the pavement itself is the color of the display identification part, it is excellent in wear resistance against abrasion by traffic vehicles, etc., and the pavement has thermal expansion and contraction. Cracks were hardly generated even when it was caused, and therefore, the durability was excellent.

[0067]

As described above, the method for producing a ceramic aggregate of the present invention first utilizes industrial waste such as defective ceramic products or waste as a starting material. From ceramic aggregate particles, for example, permeable bricks, blocks, tiles, and other ceramic products can be manufactured, so they are extremely useful as a raw material for improving the environmental landscape, and are related to industrial waste. It can contribute to solving environmental problems.

Next, in the aggregate manufactured by the method for manufacturing a ceramic aggregate according to the present invention, since the tip of the aggregate itself has an obtuse angle, for example, a permeable block manufactured using the aggregate is laid. The paved road is safe because it gives a walking feeling with a stepping answer and does not injure a car or pedestrian falling. Also, it is very convenient as an aggregate for road pavement because it is easy to adjust to asphalt and the like, and there is no interposition of small aggregates between aggregates with large particle size and impedes water permeability. It is.

Next, since the ceramic aggregate particles produced by the above-described first or second production method are granulated and then fired, a conventional dry-molding method is used for the production. To be manufactured avoiding any of the following problems: (1) relatively low green strength, (2) high consumption of molds, and (3) high cost of auxiliary equipment for maintaining health and safety. Can be.

Since the wet-formed granules are fired, unlike the conventional method of firing and then granulating, the fine particles generated when the granules are formed are reduced to the initial particles. Since it can be returned to the mixing step and reused, production costs can be reduced.

Further, the surface of the granulated material is exposed to a uniform temperature atmosphere, and can be uniformly baked at a uniform temperature, and the color tone of the pigment blended in the clay composition can be uniformly applied to the surface of the aggregate as it is. Because it is possible to appear, in addition to being able to manage the color tone of the surface of the aggregate grains at an arbitrary color without causing color unevenness, it is possible to totally manage the color tone of each aggregate, It is possible to provide a high-quality ceramic aggregate particle for producing a porous ceramic product having an excellent appearance.

As is apparent from the above description, the ceramic aggregate particles of the present invention have an appropriate roughness, so-called fine irregularities, on the surface which is not present in conventional ceramic aggregate particles, and the aggregate shape is It contains more than 80% by weight of aggregate that has a shape that is not a perfect sphere, is thin, and is not flat, and asphalt concrete and concrete using this is an economical blend. Even in the neat method, an aggregate having excellent initial adhesion and abrasion can be obtained.

In the production of the present aggregate, the unnecessary particle size is returned to the raw material process, and only the necessary particle size is baked while reusing it. It is very efficient because it adopts a method of firing only those that are not perfectly spherical and the shape of the aggregate is not a perfect sphere and is also thin and not flat, so it is very efficient, and the finished aggregate itself is The quality such as shape, surface roughness, water absorption and abrasion resistance is also excellent.

Further, by applying asphalt concrete or concrete using the aggregate particles of the present invention to a pavement display such as a pedestrian crossing, a display with high durability can be provided. INDUSTRIAL APPLICABILITY The ceramic aggregate particles of the present invention can be used for applications such as aggregates for pavement and floor materials, and have great industrial value as landscape materials.

Claims (6)

[Claims] 1. A generally polyhedral or convex polyhedron whose overall appearance is irregular, each of its sides and each apex being rounded (not sharply sharp), and the surface of each surface being formed into a rough surface with irregularities. A method for producing ceramic aggregate particles comprising the following steps. A). Step of adding water to each raw material to obtain a kneaded mixture obtained by mixing and kneading, a). A step of pulverizing a molded product obtained by molding the obtained kneaded product; c). Sieving the pulverized material obtained in the pulverization step, d). A firing step for firing the sieve residue; e). A step of crushing the fired product. 2. A general polyhedron or convex polyhedron whose overall appearance is indefinite, each side and each apex of which are rounded (not sharp) and the surface of each surface has a rough surface with irregularities. A method for producing ceramic aggregate particles comprising the following steps. A). Step of adding water to each raw material and mixing and kneading to obtain a kneaded material; Granulating the obtained kneaded material; c). A step of sieving the granules obtained in the granulation step, d). A firing step for firing the sieve residue; e). A step of crushing the fired product. 3. The method for producing a ceramic aggregate particle according to the above item a), wherein the sieved product obtained in the step of sieving the granulated product obtained in the granulating step is described in a) above.
3. The method for producing ceramic aggregate particles according to claim 1, further comprising a step of adding water to each raw material, mixing and kneading the mixture, and returning to a step of obtaining a kneaded material. 4. A generally polyhedral or convex polyhedron whose overall appearance is irregular, each side and each apex of which are rounded (not sharp) and the surface of each surface has a rough surface with irregularities. A method for producing ceramic aggregate particles comprising the following steps. A). Step of adding water to each raw material and mixing and kneading to obtain a kneaded material; Extruding the obtained kneaded product to obtain a molded body; c). B) firing the green body; Pulverizing the obtained fired product, e). A step of sieving and classifying the obtained pulverized material; Grinding to round both sides and vertices of the sieve residue obtained in the classifying step. 5. A substantially polyhedron or convex polyhedron whose overall appearance is indefinite, each of its sides and each apex being rounded (not sharply sharp), and the surface of each surface is formed into a rough surface with irregularities. A method for producing ceramic aggregate particles comprising the following steps. A). Step of adding water to each raw material and mixing and kneading to obtain a kneaded material; A step of molding the obtained kneaded material to obtain a molded body; c). B) firing the green body; Pulverizing the obtained fired product, e). A step of grinding to round both sides and vertices of the obtained pulverized material. F). Classifying the pulverized material obtained in the attrition process. 6. The method for producing ceramic aggregate particles, wherein the ceramic aggregate particles have a particle size within a desired predetermined range and are not rounded (sharply pointed).
The ceramic aggregate particles according to any one of claims 1 to 5, wherein the ceramic aggregate particles B having sides or tops are blended so that a blending ratio of the ceramic aggregate particles B is 40% by weight or less. Production method.