JP2003252672A - Heat-resistant block and heat-resistant concrete suitable for casting floor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat-resistant block and heat-resistant concrete suitable for a casting floor, which are inexpensive, have heat resistance and further exhibit superior strength compared with that of a heat-resistant block and heat-resistant concrete using general blast furnace water-granulated slag. <P>SOLUTION: The heat-resistant block contains cement constituted mainly of at least one or more of Portland cement, blast furnace cement and alumina cement, and the porous aggregate constituted of blast furnace annealed slag having a smaller porocity compared with that of the general blast furnace water-granulated slag and/or outer blast furnace water-granulated slag, and the compounded mass ratio of the cement material to the porous aggregate is 1:2-1:5. The heat-resistant concrete contains a cement material prepared by blending a blast furnace slag powder for concrete constituted mainly of a fine powder having a Bullen value of ≥5,000 cm<SP>2</SP>/g with cement, and the porous aggregate, with the compounded mass ratio of the cement to the porous aggregate is 1:2-1:5. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat-resistant block suitable for a casting floor made of blast furnace slag, which is a by-product of iron making, as a raw material for aggregates, and a heat-resistant block suitable for a casting floor (particularly a surface layer construction body of the casting floor). Regarding concrete.

[0002]

2. Description of the Related Art Conventionally, fired heat-resistant bricks (for example, red bricks and viscous bricks) have been used for floors and wall materials that have portions exposed to high temperatures such as blast furnace cast floors. However, this heat-resistant brick requires heat energy for firing and is expensive because it uses, for example, alumina as a raw material. On the other hand, when pig iron is produced in a blast furnace, blast furnace slag (for example, granulated blast furnace slag, slowly cooled blast furnace slag, etc.) is generated as a by-product, and its effective use has been desired. Therefore, a paving block has been proposed in which Portland cement is used as a binder in an aggregate composed of porous granulated blast furnace slag particles and blast furnace slowly cooled slag particles, and the blast furnace slag is used as a raw material of the aggregate ( See, for example, Patent Document 1.).

[0003]

[Patent Document 1] Japanese Patent Laid-Open No. 9-208290 (first
page)

[0004]

However, when the above pavement block is used in a blast furnace casting floor, there are the following problems. This pavement block uses granulated blast-furnace slag with a small particle size (uneven particle size distribution) and low strength as an aggregate, so that sufficient strength cannot be obtained. Therefore, the pavement block is used like a blast furnace casting floor, for example, when a special vehicle for dismantling the blast furnace gutter is running or when repairing a gutter that flushes the hot metal discharged from the blast furnace, a gutter for keeping the hot metal warm. When used in a portion where the cover is temporarily placed, it is difficult to withstand these loads and thermal shocks, and frequent block replacement and repair are uneconomical. Also, as a cast floor masonry that does not use blast furnace slag, Nubrick which is a hard brick using alumina cement as a binder is used, but this masonry also requires firing, It is necessary to consider a combination of a special aggregate and a binder, which is uneconomical due to heat energy and material cost. Even if the above-mentioned pavement block or Nubrick can be used, for example, in a narrow place, a place where it is necessary to partially increase the thickness, a place where people cannot enter, etc. There is also a problem that you can not install. The present invention has been made in view of the above circumstances, is economical, has heat resistance, and is a heat resistant block using general blast furnace granulated slag, a heat resistant block suitable for a cast floor having higher strength than heat resistant concrete. And to provide heat resistant concrete.

[0005]

A heat-resistant block suitable for a cast bed according to the first aspect of the present invention, which meets the above-mentioned object, is a cement raw material mainly containing one or more of Portland cement, blast furnace cement and alumina cement. And blast furnace slowly cooled slag with porosity smaller than general granulated blast furnace slag and /
Alternatively, the porous aggregate containing the granulated slag outside the blast furnace was contained, and the mixing ratio of the cement raw material and the porous aggregate was 1: 2 to 1: 5 by mass ratio. As described above, since the porosity is smaller than that of the general granulated blast furnace slag and the strength of the blast furnace slowly cooled slag and / or the granulated slag outside the blast furnace, which is high in strength, is used as the porous aggregate of the heat resistant block, heat resistance is improved. In addition to being equipped, it becomes possible to increase the strength as compared with a heat resistant block using general granulated blast furnace slag. Also, for the heat resistant block,
When the alumina cement is contained, it becomes possible to provide a heat-resistant block having heat resistance that can withstand a high temperature of, for example, about 800 ° C. and having higher strength than a heat-resistant block using general blast furnace granulated slag.

The heat-resistant block suitable for the casting floor according to the second aspect of the present invention, which meets the above-mentioned object, is a cement raw material mainly containing any one or more of Portland cement, blast furnace cement and alumina cement, and a porosity generally. Containing a porous aggregate composed of blast furnace slowly cooled slag smaller than blast furnace granulated slag and / or external blast furnace granulated slag, and a plasticizer capable of maintaining the shape of an intermediate product at the time of production, and a cement raw material. The compounding ratio with the porous aggregate is 1: 2 to 1: 5 by mass ratio, and the plasticizer is 0.1% by mass ratio with respect to the cement raw material.
It was set to 0001 to 0.001. As described above, since the porosity is smaller than that of the general granulated blast furnace slag and the strength of the blast furnace slowly cooled slag and / or the granulated slag outside the blast furnace, which is high in strength, is used as the porous aggregate of the heat resistant block, heat resistance is improved. In addition to being equipped, it becomes possible to increase the strength as compared with a heat resistant block using general granulated blast furnace slag. In addition, the heat-resistant block contains a plasticizer that maintains the shape of the intermediate product during demolding, for example, when the heat-resistant block is manufactured using a mold, so the heat-resistant block should not be deformed. Can be manufactured without. When the heat-resistant block contains alumina cement, the heat-resistant block has heat resistance to withstand a high temperature of, for example, about 800 ° C., and has a higher strength than the heat-resistant block using general blast furnace granulated slag. It becomes possible. In addition, the heat-resistant block contains a plasticizer that maintains the shape of the intermediate product during demolding, for example, when the heat-resistant block is manufactured using a mold, so the heat-resistant block should not be deformed. Can be manufactured without.

Here, in the heat-resistant block suitable for the casting floor according to the first and second aspects of the invention, the porous aggregate has a grain size of 0.
It is preferable that 90% by mass or more of particles of 15 to 13 mm are contained. In this way, since the particle size distribution of the porous aggregate is made uniform within a predetermined range, it becomes possible to easily manufacture a heat-resistant block having high density. In the heat-resistant block suitable for the casting floor according to the first and second aspects of the invention, it is preferable that a side portion of the heat-resistant block is provided with an engaging portion that allows adjacent heat-resistant blocks to be fitted to each other. With this configuration, the adjacent heat-resistant blocks are fitted to each other by the engaging portions, and therefore the positions of the heat-resistant blocks can be maintained without being displaced.

The heat-resistant concrete suitable for the cast floor according to the third aspect of the present invention, which meets the above-mentioned object, is one or more of Portland cement, blast furnace cement, and alumina cement, and has a Bren value of 5000 cm ² / g or more. A cement raw material that is a mixture of fine powder of blast furnace slag for concrete mainly composed of powder, and a porous aggregate composed of blast furnace slowly cooled slag and / or blast furnace external granulated slag having a porosity smaller than that of general blast furnace granulated slag. The content ratio of the cement raw material and the porous aggregate was 1: 2 to 1: 5 by mass. Thus, Portland cement and / or blast furnace cement mixed with blast furnace slag fine powder for concrete is used as a cement raw material, and the blast furnace slowly cooled slag has a lower porosity and higher strength than general granulated blast furnace slag. as well as/
Alternatively, since the granulated slag outside the blast furnace is used as the porous aggregate, for example, even if the intermediate product of the heat-resistant concrete before hardening is transported through a pipe to the driving place and constructed, the heat-resistant concrete has heat resistance and strength. Can be manufactured.

Further, a mixture of alumina cement is used as a cement raw material, and a blast furnace slowly cooled slag and / or a blast furnace external water granulated slag having a lower porosity and higher strength than general blast furnace granulated slag is used. When used as a porous aggregate, for example, even if an intermediate product of heat-resistant concrete before hardening is transported to the driving place through a pipe and constructed,
It is possible to produce heat-resistant concrete which has heat resistance to withstand a high temperature of about 00 ° C. and has strength.

In the heat-resistant concrete suitable for the casting floor according to the third aspect of the present invention, the porous aggregate has a particle size of 0.1.
It is preferable that particles of 5 to 13 mm are contained in an amount of 90% by mass or more. In this way, since the particle size distribution of the porous aggregate is made uniform within a predetermined range, it becomes possible to easily manufacture a heat-resistant concrete having a high density after the construction. In the heat-resistant concrete suitable for the cast floor according to the third aspect of the present invention, the cement raw material contains 4 parts of blast furnace slag fine powder for concrete.
It is preferably contained in an amount of 0 to 60% by mass. As described above, by regulating the amount of the fine powder of blast furnace slag for concrete in the cement raw material, it is possible to prevent the strength of the heat-resistant concrete after construction from being lowered.

In the heat-resistant concrete suitable for the cast floor according to the third aspect of the present invention, the delay type admixture that enables the fluidity of the intermediate product at the time of production is 0.025 to 0 by mass ratio with respect to the cement raw material. .06 is preferably contained. In this way, since the delayed admixture is added, it is possible to delay the hardening of the intermediate product of the heat-resistant concrete which is transported to the driving place through the pipe, for example, as compared with the case where the delayed admixture is not added. In the heat-resistant concrete suitable for the cast floor according to the third aspect of the present invention, a foaming agent that enables weight reduction of the intermediate product during production is contained in a mass ratio of 0.005 to 0.01 with respect to the cement raw material. Is preferred. Thus, since the foaming agent is added, the density of the intermediate product of the heat-resistant concrete that is transported, for example, through the pipe to the driving place can be reduced as compared with the case where the foaming agent is not added.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Next, referring to the attached drawings, an embodiment in which the present invention is embodied will be described to provide an understanding of the present invention. 1 (A) and 1 (B) are plan views of a heat-resistant block suitable for a casting floor according to an embodiment of the present invention, and FIG. 2 is a particle size distribution of blast furnace slowly cooled slag used in the heat-resistant block. FIG. 3, FIG. 3 is an explanatory view of the particle size distribution of the blast furnace slowly cooled slag used in the heat resistant block, FIG. 4 is an explanatory view of a method for manufacturing the heat resistant block, and FIGS. 5 (A) and 5 (B).
Is a cross-sectional view of the hot metal gutter, cross-sectional view of the hot metal gutter, FIG. 6 is an explanatory view of a method for producing heat-resistant concrete suitable for a casting floor according to an embodiment of the present invention, and FIG. 7 is an example of the present invention. Explanatory drawing of the compressive strength of the heat-resistant block suitable for such a casting floor, FIG.
Is an explanatory view of bending strength of the heat resistant block, FIG. 9 is an explanatory view of compressive strength of heat resistant concrete suitable for a cast floor according to an embodiment of the present invention, and FIG. 10 is an explanatory view of bending strength of the heat resistant concrete. .

As shown in FIGS. 1A and 1B, heat-resistant blocks (hereinafter, also simply referred to as heat-resistant blocks) 10 and 11 suitable for a casting floor according to an embodiment of the present invention are heat-resistant blocks. Adjacent heat-resistant blocks 1 on the sides of 10 and 11
0 and 11 are called interlocking blocks provided with engaging portions 12 that can be fitted to each other. Further, the heat-resistant blocks 10 and 11 are any one of Portland cement, blast furnace cement, and alumina cement.
Alternatively, it contains a cement raw material mainly composed of 2 or more and a porous aggregate composed of blast furnace slowly cooled slag having a porosity smaller than general blast furnace granulated slag and / or blast furnace granulated slag, and the cement raw material and porous Mixing ratio with natural aggregate is 1: 2 by mass ratio
˜1: 5. The details will be described below.

As shown in FIG. 1A, the heat-resistant block 10 has a substantially square shape in a plan view, and its size is, for example, a length L1 and a width W1 of 50 to 300 mm.
The thickness and the thickness are about 50 to 100 mm. Further, as shown in FIG. 1 (B), the shape of the heat-resistant block 11 which is different from the heat-resistant block 10 is substantially rectangular in plan view, and the size thereof is, for example, a length L2 of 100 to 100. About 300 mm, width W2 is 1/3 of length L2
The thickness is about 2/3 and the thickness is about 50 to 100 mm. Here, the engaging portions 12 provided all around the heat resistant blocks 10 and 11 are wavy in a plan view, and the pitch P thereof is, for example, about 30 to 80 mm.
With this configuration, the plurality of heat resistant blocks 10,
When the heat-resistant blocks 10 and 11 are arranged, the engaging portions 12 of the heat-resistant blocks 10 and 11 that are adjacent to each other are engaged with each other, and the positional deviation of the heat-resistant blocks 10 and 11 can be prevented.

Next, the raw materials used for the heat resistant blocks 10 and 11 will be described. Blast furnace slag is classified into blast furnace granulated slag, blast furnace external granulated slag, and blast furnace slowly cooled slag (hereinafter also simply referred to as granulated slag, externally granulated slag, and slowly cooled slag) depending on the manufacturing method. To be Therefore, although the manufacturing method is different, the components are the same, and C
It is mainly composed of oxides of a, Si and Al. The general granulated slag that is manufactured in front of the blast furnace and used for conventional heat-resistant blocks is a process in which molten slag of approximately 1500 ° C is flowed through a blowing device to produce a large amount of high-pressure water (for example, 1 to 3.5 kg). /
It is prepared by quenching by blowing cm ^2). For this reason,
The produced granulated slag is light and fragile because it has soft and innumerable bubbles and has an angular shape.

In contrast to this granulated slag, the granulated slag outside the furnace is hard and heavy and is rounded because it is treated by a grinder. This is because the manufacturing technology is different as described above, and the granulated slag outside the furnace is manufactured after carrying the molten slag to a remote place outside the system of the blast furnace, so at the time of flowing the molten slag into the blowing device. The temperature of the molten slag has dropped from about 1500 ° C to about 1300 ° C. By flowing this molten slag into a blowing device, spraying a small amount of low-pressure water and semi-quenching, a hard and angular slag is manufactured. In addition, if you use it with this corner,
When the heat-resistant block is manufactured using a mold, the moldability and demoldability are adversely affected. In order to improve this drawback, for example, particles of each other may collide with each other,
In addition, the particles are made to collide with a liner made of wear-resistant material (collision crusher) to remove the particles formed into particles.

The slow-cooled slag is produced by pouring the molten slag into a cooling yard called a dry pit or a field and cooling it by natural cooling and proper watering. The slow-cooled slag produced is in the form of crystalline rock and is usually crushed to a predetermined particle size in a sizing facility before use. Therefore, the granulated slag outside the furnace is
It can be seen that the slag has a property between granulated slag and slowly cooled slag. In addition, in order to evaluate the porosity of each of the above-mentioned water granulated slag, water granulated slag outside the furnace, and slowly cooled slag, as a result of measuring the water absorption of each, about 10%, about 1%, about 0, and more than 1%. It was less than about. This water absorption is
This can be measured when the pores of each slag are continuous with the outside (atmosphere), and the pores that are confined inside each slag and are isolated from the outside cannot be measured. However, since the measurement conditions for each slag are the same, it is possible to use the porosity of each slag as an index for comparative evaluation. The water absorption rate of crushed stone and gravel, which were conventionally used as aggregates of heat-resistant blocks, was about 0%.

Here, the grain size of the porous aggregate used for the heat resistant blocks 10 and 11 will be described. When manufacturing the heat resistant block as an interlocking block,
Conventionally, it was necessary to artificially mix aggregates having different particle sizes so as to have a particle size configuration capable of increasing strength development and ensuring moldability and mold release property during manufacturing. for that reason,
Several types of aggregates having a coarse particle size (coarse aggregates) and fine aggregates (fine aggregates) are manufactured in combination. Here, an example of the mixture (aggregate after mixing) and the particle size distribution of the above-described slowly cooled slag are shown in Table 1 and FIG. Incidentally, in the aggregate after mixing, the sieve passing weight percentage passing through each sieve mesh is the numerical value obtained by multiplying the sieve passing weight percentage of each aggregate by the blending ratio of the aggregate, and summing the respective numerical values. . For example, in the case of the aggregate after mixing, when the sieve passing weight percentage passing through the sieve mesh having a size of 5 mm is obtained, it is obtained by the following formula. (5.1% x 0.241) + (91.2% x 0.18
9) + (99.4% × 0.10) + (100% × 0.4
7) = 75.4% As a result, in the aggregate after mixing, the sieve passing weight percentage passing through the sieve mesh having a size of 5 mm is 75.4%.

[0019]

[Table 1]

Here, the broken line on the left side in FIG. 2 indicates the grain size specification range of fine aggregate, while the broken line on the right side indicates the grain size specification range of coarse aggregate. As shown in FIG. 2, the particle size distribution of the aggregate after mixing (x in the figure) is a uniform particle size distribution from fine aggregate to coarse aggregate by combining several kinds of aggregates, and the interlocking block It can be seen that the particle size distribution is suitable for manufacturing. Also, slow cooling slag (○ in the figure)
Also in this case, since a line similar to this particle size distribution is drawn, it is understood that the slowly cooled slag can be used as an aggregate of the interlocking block. The gradually cooled slag contains 90 mass% or more of particles having a particle size of 0.15 to 13 mm.

The interlocking block includes
There is no standard for the particle size of aggregate, and it is generally ideal that the particle size be continuous with a gentle curve as described above. Further, as the particle size index of the aggregate used for the interlocking block, as shown in FIG. 3, for example, the maximum size is 15 mm (the range surrounded by the broken line in the figure),
A Fuller curve (solid line in the figure) and the like obtained from the closest packing equation is used. This maximum dimension of 15 mm is the desired grain size range indicated in the interlocking block manufacturing manual, and the Fuller curve is often used as the grain size array for the aggregates that most closely fills the concrete. As shown in FIG. 3, the particle size distribution of the slowly cooled slag is substantially within the range surrounded by the above-mentioned broken line and solid line, which indicates that the particle size is suitable for the interlocking block. .

As described above, since the grain size distribution of the slowly cooled slag is uniform, the grain size of each grain size is controlled so as to have a predetermined grain size distribution like crushed stone or gravel which has been conventionally used as an aggregate of an interlocking block. It is not necessary to adjust the mixing ratio of the aggregate. Therefore, the manufacturing time can be shortened and an interlocking block having a high density can be manufactured. Therefore, even if the blending amount of the cement raw material is reduced, the interlocking block having sufficient strength can be easily manufactured. Also,
As a result, the manufacturing time can be shortened, and it becomes possible to immediately respond to a request for a short delivery time. As the porous aggregate, when using the slowly cooled slag and the granulated slag outside the furnace, increase the mixing ratio of the slowly cooled slag in the porous aggregate, or the particle size distribution of the granulated slag outside the furnace in advance. It is preferable to make the particle size uniform and adjust the particle size so that the particle size falls within the above range. When using only the granulated slag outside the furnace as the porous aggregate, it is preferable to improve the particle size distribution of the granulated slag outside the furnace and adjust the particle size so that it falls within the above range. .

Here, the relationship between the particle size and heat resistance of the porous aggregate will be described. The particle size distribution of the porous aggregate is wide as described above, and the presence of fine particles to coarse particles allows the porous aggregate to be densely packed. As a result, the amount of binder (cement) that binds the adjacent porous aggregates can be reduced, the interval between the adjacent porous aggregates can be narrowed, and the thickness of the binder can be reduced. Therefore, even when the surface of the heat-resistant block is subjected to heat, the heat does not accumulate in the binder with high heat insulating properties, and the heat escapes to the inside of the heat-resistant block through the porous aggregate having relatively good heat conductivity. It is presumed that it becomes difficult for the temperature to rise to the temperature at which is brittle. Therefore, it is considered that by widening the particle size distribution of the porous aggregate, it is possible to manufacture a heat-resistant block having heat resistance with less strength reduction than the conventional heat-resistant block even when the heat-resistant block has a high temperature. .

Portland cement is a cement produced by adding an appropriate amount of gypsum to a clinker containing hydraulic calcium silicate as a main component and finely pulverizing it. Blast furnace cement is an appropriate amount of dried granulated slag and clinker (a raw material mixture such as siliceous raw material, ferrous raw material, viscosity, limestone, etc., which is fired in a semi-molten state at high temperature and solidified into a block). Gypsum is added and mixed and ground, or separately ground and uniformly mixed. This blast furnace cement has
Depending on the amount of granulated slag contained in the blast furnace cement, there are blast furnace cements A to C types, but in this embodiment, blast furnace cement type B is used. However, it is also possible to use blast furnace cement class A or class C.
As the cement raw material, alumina cement may be used instead of portland cement and / or blast furnace cement, or alumina cement may be added to portland cement and / or blast furnace cement. When Portland cement and / or blast furnace cement is used as the cement raw material, water of crystallization is easily lost, so that the application is mainly to a portion where the ambient temperature is from room temperature to less than 300 ° C. When alumina cement is used,
Since the water of crystallization is not easily lost, the ambient temperature is 300-80.
It becomes possible to apply it to the part at 0 ° C. in this way,
By changing the type of cement raw material, it becomes possible to manufacture heat-resistant blocks for each application with a boundary of 300 ° C.

In the heat resistant blocks 10 and 11, a plasticizer capable of maintaining the shape of an intermediate product manufactured by using a mold at the time of manufacturing the heat resistant blocks 10 and 11 is added to the cement raw material. 0.0001 to 0.001 by mass ratio
It is mixed. Immediate release type concrete products, such as interlocking blocks, are non-plastic concretes that have little water content in the mixed concrete and little fluidity. If such concrete is molded as it is, it is difficult to obtain a solid molded product because of poor filling properties, and the strength tends to be disadvantageous (decreased). The plasticizer described above imparts this plasticity. Furthermore, AE (air-ent) is added to this plasticizer.
It is also possible to use an AE plasticizer aiming at the effect of increasing the durability of concrete such as preventing freezing damage by entraining fine air in the cement paste by providing a raining effect.

Next, the reasons for setting the mixing ratio of the cement raw material and the porous aggregate in the heat resistant blocks 10 and 11, the mixing ratio of the plasticizer, and the range of the particle size of the porous aggregate will be described. . The mixing ratio of the cement raw material and the porous aggregate in the heat-resistant blocks 10 and 11 was set in the range of 1: 2 to 1: 5 by mass ratio. From this, the porous aggregate occupied in the heat-resistant blocks 10 and 11 When the amount of
It becomes impossible to perform molding and demolding of the heat resistant blocks 10 and 11 using a mold. On the other hand, when the mixing ratio of the porous aggregate is larger than this, the amount of the cement raw material in the heat resistant blocks 10 and 11 having a role of the binder is small, and the manufactured heat resistant blocks 10 and 11 are fragile and have a desired strength. (With the interlocking block standard value, the compressive strength is 32.0 MPa and the bending strength is 5.0 MP.
a) cannot be obtained. Therefore, the heat-resistant blocks 10, 1
In order to further improve the molding and demolding during the production of 1 and obtain the target strength, the mixing ratio of the cement raw material and the porous aggregate is 1: 2 to 1: 4.5 by mass ratio. And more preferably 1: 2 to 1: 4.

When the blending ratio of the plasticizer is less than 0.0001 by mass ratio with respect to the cement raw material, the effect of the plasticizer cannot be sufficiently exerted during the production of the heat resistant blocks 10 and 11 using the mold. In addition, the intermediate product after demolding is likely to be deformed, and the manufactured heat-resistant blocks 10 and 11 are produced.
Strength may decrease. On the other hand, if the mixing ratio of the plasticizer is more than 0.001 by mass ratio with respect to the cement raw material, it is not economical because the effect of the plasticizer at the time of manufacturing the heat resistant blocks 10 and 11 cannot be further increased. Therefore, in order to further increase the strength of the heat resistant blocks 10 and 11, and to exert the effect of the plasticizer economically,
The blending ratio of the plasticizer is 0.0002 to 0.0005 by mass ratio with respect to the cement raw material, and further 0.0002 to
It is preferably 0.0004.

When the particle diameter of the porous aggregate is smaller than 0.15 mm, the viscosity of the mixture becomes high during the kneading of the cement raw material and the porous aggregate. It is uneconomical because it becomes difficult to remove the mold and the amount of cement raw material must be increased. On the other hand, when the particle diameter of the porous aggregate is larger than 13 mm, it becomes difficult to mold the intermediate product with the mold and to remove the intermediate product from the mold. Therefore, in order to perform the molding and demolding of the intermediate product economically without increasing the viscosity of the mixture, the porous aggregate has particles with a particle size of 0.15 to 13 mm. It was set so as to be contained by mass% or more. However, in order to make it more economical and to easily perform molding and demolding of the intermediate product, the porous aggregate has 9 particles with a particle size of 0.15 to 13 mm.
It is preferably 2% by mass or more, and more preferably 93% by mass or more.

Next, a method of manufacturing the heat resistant block 10 suitable for the casting floor according to the embodiment of the present invention will be described with reference to FIG. First, Portland cement,
The cement raw material mainly containing any one or more of blast furnace cement and alumina cement, porous aggregate composed of blast furnace slowly cooled slag and / or blast furnace external water granulated slag, and a plasticizer are specified above. Using a weighing machine 13, the ingredients are weighed and blended so that the blending ratio becomes. And add water to it,
For example, the total mass of the cement raw material and the porous aggregate is from 17 to
It is added after being weighed with a weighing machine 13 so as to be about 20% by mass, and kneaded with a kneading machine (for example, a mixer) 14. Although a plasticizer is added in this embodiment, it is also possible to knead without adding a plasticizer.

The mixture thus kneaded is molded by a molding machine 15
And is poured into a mold having a shape corresponding to the shape of the heat resistant block 10 to be manufactured. Then, after placing a press plate on the surface layer of the mixture, the pedestal on which the mold is placed is vibrated to compact the mixture to manufacture an intermediate product. After manufacturing the intermediate product, remove the press plate from the form,
After demolding the manufactured intermediate product from the mold, dry curing of the manufactured intermediate product is performed in the curing chamber 16 using steam. Thereby, the heat resistant block 10 is manufactured. Using the plurality of heat-resistant blocks 10 thus manufactured, the engaging portions 12 of the heat-resistant blocks 10 adjacent to each other are fitted to each other.
It is used for the cast floors 17 and 18 shown in (A) and (B). The casting bed 17 is formed on the outer peripheral portion of the hot metal gutter 19 and the casting bed 18 is formed on the outer peripheral portion of the hot metal gutter 20. Here, as the material forming the hot metal gutter 19 and the hot metal gutter 20, for example, red brick, heat insulating brick, or the like is used.

Next, a heat-resistant concrete suitable for a cast floor according to an embodiment of the present invention will be described. Raw materials used for heat-resistant concrete, that is, Portland cement, blast furnace cement, alumina cement, blast furnace slowly cooled slag, The granulated slag outside the blast furnace is the heat-resistant block 1 described above.
Since the same raw material as that used for 0 and 11 is used, detailed description is omitted. Heat resistant concrete suitable for the cast floor according to one embodiment of the present invention, Portland cement,
Fine powder having a Bren value of 5000 cm ² / g or more is mainly contained in one or more of blast furnace cement and alumina cement (for example, 70% or more, preferably 80% or more)
A cement raw material in which a blast furnace slag fine powder for concrete is mixed, and a porous aggregate composed of a blast furnace slowly cooled slag having a porosity smaller than that of a general granulated blast furnace slag and / or an external granulated blast furnace slag, The mixing ratio of the cement raw material and the porous aggregate was 1: 2 to 1: 5 by mass ratio.

In the cement raw material of heat-resistant concrete,
Bren value is 5000 cm² / G or more of fine powder is the main constituent
40-60% by mass of blast furnace slag fine powder for concrete
include. The Bren value is an index of fineness.
1 cm² It is defined by the number of particles that enter. Therefore,
As the Bren value increases, the particle size becomes smaller.
Therefore, the specific surface area increases. In this way, the specific surface area increases
As the particle size increases, the activity of the particles increases and the initial strength increases.
Will be done. Therefore, the Bren value is 5000 cm² /
Blast furnace slag for concrete mainly composed of fine powder of g or more
By using fine powder, the denseness of heat-resistant concrete can be improved.
Strength that can be increased and heat resistant concrete has the desired strength
Can be provided. In addition, the normal height for concrete
Bren value of furnace slag is 3500 cm² / G,
Bren value of Portland cement is 3000 cm ² / G
It is a degree.

Further, the heat-resistant concrete contains a delay-type admixture for ensuring the fluidity of an intermediate product during the production of the heat-resistant concrete in a mass ratio of 0.025 to 0.060 with respect to the cement raw material. ing. As the delay type admixture, for example, Kao Mighty 150-R (manufactured by Kao Corporation) or the like can be used. Construction of heat-resistant concrete, usually, after mixing the above-mentioned raw materials, it has to be transported to the driving place, but if the delay-type admixture is not added, the intermediate product in the middle of transportation will easily harden, Workability may deteriorate. That is, the above-mentioned delay type admixture secures the fluidity of the intermediate product during transportation.

In the heat-resistant concrete, a foaming agent capable of reducing the weight of the intermediate product during the production of the heat-resistant concrete is added in a mass ratio of 0.005 to the cement raw material.
0.01 is included. As the foaming agent, for example, Pozoris FF606 (manufactured by Pozoris Co., Ltd.) can be used. Construction of heat-resistant concrete, as mentioned above,
After mixing the raw materials, it must be transported to the driving place, but if a foaming agent is not added, the density of the intermediate product in the middle of transportation may be high and the workability during transportation may deteriorate. . That is, the above-mentioned foaming agent is intended to reduce the density of the intermediate product during transportation and to reduce the weight.
It should be noted that either one of the retarding admixture and the foaming agent described above can be added to the heat-resistant concrete in advance, but it is also possible to add both of them.

Then, the mixing ratio of the cement raw material and the porous aggregate in the heat-resistant concrete, the mixing ratio of various cements in the cement raw material and the blast furnace slag fine powder for concrete, the mixing ratio of the delay type admixture, and The reason for setting the mixing ratio of the foaming agent will be described. The mixing ratio of the cement raw material and the porous aggregate in the heat-resistant concrete was set to the range of 1: 2 to 1: 5 by mass ratio, but if the amount of the porous aggregate in the heat-resistant concrete becomes smaller than this, It becomes impossible for the heat-resistant concrete after driving to achieve the target strength equivalent to the standard value of the interlocking block. On the other hand, when the mixing ratio of the porous aggregate is larger than this, the amount of the cement raw material in the heat-resistant concrete having the role of the binder is small, the heat-resistant concrete after driving is brittle, and the above-mentioned target strength is obtained. I will not be able to. Therefore, in order to achieve the target strength of the heat-resistant concrete after driving, the mixing ratio of the cement raw material and the porous aggregate is 1: 2 by mass.
It is preferable that the ratio is ˜1: 4.5, more preferably 1: 2 to 1: 4. The particle size of the porous aggregate used for the heat-resistant concrete does not need to be strictly considered as in the case of the heat-resistant blocks 10 and 11 described above. For example, a porous aggregate having a particle size of 25 mm or less is used. Although it can be used, it is preferably set so that 90% by mass or more of particles having a particle size of 0.15 to 13 mm are included, like the porous aggregate used in the heat resistant blocks 10 and 11.

Further, when the mixing ratio of the blast furnace slag fine powder for concrete is less than 40% by mass of the cement raw material, the amount of various cements in the cement raw material becomes large, and cracks are generated in the heat-resistant concrete in a heating atmosphere. However, the strength is significantly reduced. On the other hand, when the mixing ratio of the blast furnace slag fine powder for concrete is more than 60% by mass of the cement raw material, the amount of the blast furnace slag fine powder for concrete in the cement raw material is large, so that cracks do not occur in the heat-resistant concrete, After all, the strength decreases. Therefore, in order to maintain the strength of heat-resistant concrete at a high level even in a heated atmosphere, the blast furnace slag fine powder for concrete in the cement raw material may be 43 to 57% by mass, and further 45 to 55% by mass. preferable.

When the blending ratio of the delay type admixture is less than 0.025 by mass ratio with respect to the cement raw material,
During transportation of the intermediate product of heat-resistant concrete, the effect of the delay-type admixture may not be sufficiently exerted, and for example, the intermediate product may harden and workability may deteriorate. On the other hand, the blending ratio of the delay-type admixture was set to 0.
If it exceeds 06, the effect of the delaying admixture cannot be expected to further increase, which is not economical. Therefore, in order to bring out the effect of the delayed admixture economically and sufficiently, the blending ratio of the delayed admixture is 0.0
It is preferably 28 to 0.057, and more preferably 0.03 to 0.055. When the blending ratio of the foaming agent is less than 0.005 by mass ratio with respect to the cement raw material, the effect of the foaming agent cannot be sufficiently exhibited during transportation of the intermediate product of heat-resistant concrete, and for example, the density of the intermediate product Becomes higher, the weight cannot be reduced, and workability may deteriorate. On the other hand, when the blending ratio of the foaming agent is more than 0.01 by mass ratio with respect to the cement raw material, it is not economical because the effect of the foaming agent cannot be expected to further increase. Therefore, in order to bring out the effect of the foaming agent economically and sufficiently, the mixing ratio of the foaming agent is 0.006 mass% to the cement raw material.
It is preferably 0.01, and more preferably 0.007 to 0.01.

Next, a method for producing heat-resistant concrete suitable for a cast floor according to one embodiment of the present invention will be described with reference to FIG. First, either 1 or 2 of Portland cement, blast furnace cement, and alumina cement
As described above, a cement raw material in which blast furnace slag fine powder for concrete is mixed, a porous aggregate composed of blast furnace slowly cooled slag and / or blast furnace external water granulated slag, and either one of a delay type admixture and a foaming agent or The additive composed of both is weighed and blended using the weighing machine 21 so that the predetermined blending ratio is obtained. Then, water is added to this after measuring about 30% of the mass of the cement raw material by using the measuring machine 21, and then added, and mixed by using the mixer (for example, mixer) 22. In this embodiment, any one or more of Portland cement, blast furnace cement, and alumina cement is mixed with blast furnace slag fine powder for concrete, but blast furnace slag fine powder for concrete is mixed with Portland cement and blast furnace. It is also possible to mix any one or more of cement and alumina cement, and also to mix any one or more of Portland cement, blast furnace cement, and alumina cement, blast furnace slag fine powder for concrete, and porous aggregate. It is also possible to measure and mix each using the measuring machine 21, and then mix with the mixing machine 22. Further, although the additive is added here, it is also possible to mix without adding the additive.

The mixture after the mixing is mixed with a conventionally known concrete pump 23 (for example, a hydraulically driven piston type, a squeeze type suitable for kneading concrete, a squeezing type using a rubber tube, and a screw provided with a spiral conveying section. Type, concrete placer that sends by compressed air, etc.) to the place of driving. At this time, in the cast floors 17 and 18 shown in FIGS. 5A and 5B, for example, a place where the heat resistant blocks 10 and 11 cannot be installed, for example, a narrow place, or a place where the thickness needs to be partially increased. The heat-resistant concrete is manufactured by pouring and hardening the intermediate product of the heat-resistant concrete that has been transported into a place where people cannot enter.

[0040]

EXAMPLES Refer to FIGS. 7 and 8 and Table 2 for the results of strength tests (compressive strength test, bending strength test) using a heat resistant block suitable for a cast floor according to an embodiment of the present invention. While explaining.

[0041]

[Table 2]

Regarding both the compressive strength and the bending strength, Case 1 to Case 11 which are the materials of the present invention are the standard values of the interlocking block (compressive strength 32.0 MPa).
As described above, the bending strength was 5.0 MPa or more). Further, the compressive strength and bending strength of the material of the present invention could be increased by using the plasticizer as compared with the case where it was not used. That is, it was found that the use of the plasticizer resulted in greater strength development. When the strengths of the heat-resistant blocks using Portland cement and blast furnace cement were compared, it was found that there was almost no difference in strength.

Comparative material 1 was compared with the material of the present invention.
Is a block in which the mixing ratio of the cement raw material and the aggregate is 1 to 3 in the same mass ratio as the invention material, but as the aggregate, the slowly cooled slag and the soft granulated slag (general blast furnace granulated slag are used. ) Is used, and the mixing ratio is 10:90 in terms of mass ratio. As a result, both the compressive strength and the bending strength are far below the standard values. Further, as can be seen from Table 2, Comparative Material 2 and Comparative Material 3 are blocks using Portland cement as a cement raw material and slowly cooled slag as an aggregate, respectively, as in the present invention material.
The mixing ratios of the cement raw material and the aggregate were set to the mass ratios outside the range of the material of the present invention, that is, 1: 5.5 and 1: 1.5. As a result, the comparative material 2 was below the standard value, and the comparative material 3 was difficult to form an intermediate product in the mold.

Next, the results of strength tests (compressive strength test, bending strength test) using heat-resistant concrete suitable for the cast floor according to one embodiment of the present invention are shown in FIG. 9 and FIG.
0, with reference to Table 3.

[0045]

[Table 3]

The case 21 to the case of the material of the present invention
26, and the cements used in Comparative Materials 11 to 13
Raw material (C) has a blend value of 600 with various cements (D)
0 cm ² / G or more fine powder for concrete
It is composed of blast furnace slag fine powder. Also cement
The raw material (C) and the porous aggregate (B) are in a mass ratio (C):
(B) = 1: 4. As is clear from FIG. 9 and Table 3.
, Blast furnace slag fine powder for concrete in cement raw material
Is a material of the present invention containing 60 to 40% by mass of
The compressive strengths of 21 to case 24 are, of course, at room temperature,
Even after drying at 800 ° C for 8 hours (H), most of the
Which is the standard value of the target interlocking block
(Compressive strength of 32.0 MPa or more) was satisfied.

When the compressive strengths of heat-resistant concrete using alumina cement (case 21) and Portland cement (case 23) were compared, there was almost no difference in strength, but when dried at high temperature, alumina cement was used. It can be seen that the heat-resistant concrete has slightly higher strength. Further, when comparing the case 23 (blast furnace slowly cooled slag) and the case 26 (blast furnace external granulated slag) in which the type of porous aggregate is changed, it is found that there is almost no difference in compressive strength.

In addition, Case 23 (without addition of additives) and Case 25 in which the effect of addition of additives was examined
(Delayed admixture in mass ratio to cement raw material (C):
Even when compared with 0.04, a foaming agent: 0.01 addition), there was no decrease in the compressive strength due to the addition of the additive. A slump value of 60 was obtained when a slump test described in JIS A 1101 was conducted to evaluate the fluidity of the intermediate product by using the intermediate product of Case 25 containing an additive.
20.5 (cm) after 120 minutes and 21.0 (c) after 120 minutes
m). Although there is no standard slump value, it is 0 (cm) when the intermediate product is completely cured, and is preferably about 18 (cm) when transported by a pump car,
For example, when it is used for civil engineering and construction, the target value is an intermediate value. Therefore, it can be seen that the intermediate product of heat-resistant concrete has a large slump value and is suitable for transportation.

Comparative material 1 was compared with the material of the present invention.
1 to Comparative Material 13 are heat-resistant concrete in which the mixing ratio of the cement raw material and the porous aggregate is set to 1 to 4 in the same mass ratio as the invention material, but Comparative Material 11 and Comparative Material 12 are cement raw materials. The blast-furnace slag fine powder for concrete is 70 mass% and 30 mass%, respectively, and the comparative material 13 uses only Portland cement as a cement raw material and uses crushed stone as a porous aggregate. as a result,
The compressive strength of the comparative material 11 is significantly lower than the standard value, and the compressive strength of the comparative material 12 satisfies the standard value at room temperature, but is still significantly lower than the standard value at a high temperature of 800 ° C. In addition, the compressive strength of the comparative material 13 could not be measured at a high temperature of 800 ° C. because cracks were generated.

As is clear from FIG. 10 and Table 3, the bending strengths of Case 21 to Case 24, which are materials of the present invention in which the cement raw material contains 60 to 40 mass% of blast furnace slag fine powder for concrete. However, the same tendency as the above-mentioned compressive strength is observed, and of course at room temperature, 2
Even after drying at 00 ° C. for 24 hours (H), the target interlocking block standard value (bending strength of 5.0 MPa or more) was satisfied.

The present invention has been described above with reference to the embodiments, but the present invention is not limited to the configurations described in the above embodiments, and is described in the scope of claims. Other embodiments and modifications that are conceivable within the scope of the matters mentioned above are also included. For example, in the above embodiment, Portland cement, blast furnace cement,
When a heat-resistant block is produced from a cement raw material mainly containing any one or more of alumina cement and a porous aggregate composed of blast furnace slowly cooled slag and / or blast furnace granulated slag outside the furnace, and Portland semes Cement, blast-furnace cement, and alumina cement, mixed with fine powder of blast-furnace slag for concrete, and a blast-furnace slowly-cooled slag and / or outside the blast-furnace furnace with porosity smaller than general granulated blast-furnace slag The case where the heat-resistant concrete is manufactured with the porous aggregate made of granulated slag has been described. However, in order to further improve the properties of the heat-resistant block and the heat-resistant concrete without impairing the properties of the heat-resistant block and the heat-resistant concrete, for example, when other cement raw materials or aggregates are included, or inevitable impurities are included. The case is also within the scope of the present invention.

The use of the heat resistant block for a cast floor of the present invention in place of ordinary red bricks, clay bricks or nu bricks is also within the scope of the present invention. Moreover, in the said embodiment, the case where the shape of the heat-resistant block was made into the substantially square shape or the rectangular shape of a substantially rectangular shape in planar view was demonstrated. However, depending on, for example, the installation location or intended use of the heat resistant block, for example, a substantially circular shape in a plan view,
It is also possible to use a substantially semicircular shape, a substantially regular polygonal shape, or the like. And in the said embodiment, although the case where the engaging part was provided in all the circumference of a heat resistant block was demonstrated, it is not necessary to provide, and also only a part (for example, one side) of the circumference of a heat resistant block. It is of course possible to provide a hooking portion.

[0053]

EFFECTS OF THE INVENTION In a heat-resistant block suitable for a cast floor according to claims 1 to 4, the blast furnace slowly cooled slag and / or the blast furnace external water granulated having a porosity smaller than that of general granulated blast furnace slag and having a higher strength. Since the slag is used as the porous aggregate of the heat resistant block, it has heat resistance and can have higher strength than the heat resistant block using general granulated blast furnace slag. Therefore, for example, a heat-resistant block containing a cement raw material and a porous aggregate made of a by-product can be used in a cast floor that has conventionally used a red brick, which has a high product cost, and thus is economical. In addition, the heat-resistant block can be manufactured simply by kneading and pouring it into a mold without firing like red brick, so that the manufacturing is easy and the workability is good, and heat energy is not required, and it is economical. When the heat resistant block contains, for example, alumina cement, it has heat resistance to withstand a high temperature of, for example, about 800 ° C. Therefore, the heat-resistant block can be arranged in a place where the temperature becomes high, which is economical.

Claim 2 and claims 3 and 4 subordinate thereto.
In the heat-resistant block suitable for the casting floor described, in the heat-resistant block, for example, in the case of manufacturing a heat-resistant block using a mold, a plasticizer is included to maintain the shape of the intermediate product during demolding. Since the heat-resistant block can be manufactured without losing its shape, it is easy to manufacture and has good workability. When the heat resistant block contains, for example, alumina cement, it has heat resistance to withstand a high temperature of, for example, about 800 ° C. Therefore, the heat-resistant block can be arranged in a place where the temperature becomes high, which is economical. The heat-resistant block contains a plasticizer that maintains the shape of the intermediate product at the time of demolding, for example, when the heat-resistant block is manufactured using a mold, so that the heat-resistant block does not lose its shape. Since it can be manufactured, it is easy to manufacture and has good workability.

Particularly, in the heat-resistant block suitable for the casting floor according to claim 3, since the particle size distribution of the porous aggregate is made uniform within a predetermined range, a heat-resistant block having a high density can be easily manufactured. It will be possible. Therefore, the strength of the heat-resistant block can be further increased, so that the heat-resistant block having high reliability can be provided. In the heat resistant block suitable for the cast floor according to claim 4, since the adjacent heat resistant blocks are fitted to each other by the engaging portions, the positions of the respective heat resistant blocks can be maintained without being displaced. Becomes Therefore, even if a heavy object such as a heavy machine travels over a plurality of installed heat-resistant blocks, the heat-resistant blocks maintain their positions at the time of installation, so that the heat-resistant blocks do not need to be repositioned and are stable. The work can be performed on the cast floor and the workability is improved.

In the heat-resistant concrete suitable for casting floors according to claims 5 to 9, various cements to which fine powder of blast furnace slag for concrete is added are used as a raw material for cement, and the porosity of general granulated blast furnace slag is higher. Is small,
Moreover, since the blast furnace slowly cooled slag and / or the blast furnace granulated slag having high strength are used as the porous aggregate, even if the intermediate product of the heat-resistant concrete before hardening is transported to the driving place through the pipe, for example, It is possible to manufacture heat resistant concrete having heat resistance and strength. Therefore, even in places where it was difficult to install blocks in the past, such as narrow places, places where it is necessary to partially increase the thickness, places where people cannot enter, etc., simply pour the intermediate product of the mixed heat-resistant concrete. Since it can be easily constructed, it can be constructed according to each location and has good workability. Further, for example, using a mixture of alumina cement as a cement raw material,
Further, when the blast furnace slowly cooled slag and / or the blast furnace outside water granulated slag, which have a lower porosity than general granulated blast furnace slag and have high strength, are used as the porous aggregate, for example, an intermediate product of heat-resistant concrete before hardening is used. It is possible to manufacture heat-resistant concrete that has heat resistance and withstands a high temperature of about 800 ° C. even if it is transported through a pipe to a driving place and constructed. Therefore, the heat-resistant concrete can be placed even in a place having a high temperature, which is economical.

In the heat-resistant concrete suitable for the cast floor according to claim 6, since the particle size distribution of the porous aggregate is made uniform within a predetermined range, it is possible to easily manufacture a heat-resistant concrete having a high density after the construction. Is possible. Therefore, since the strength of the heat-resistant concrete can be further increased, it is possible to provide the heat-resistant concrete with high reliability. In the heat-resistant concrete suitable for the cast floor according to claim 7, by limiting the amount of the blast furnace slag fine powder for concrete in the cement raw material, it is possible to prevent the strength of the heat-resistant concrete after construction from being lowered, so that the safety and reliability are improved. It is possible to provide high heat resistant concrete. Claim 8
In the heat-resistant concrete suitable for the casting floor described, since the delay type admixture is added, for example, the hardening of the intermediate product of the heat-resistant concrete transported to the driving place through the pipe,
It can be delayed compared to the case where the retarding admixture is not added. Therefore, the transportation work when transporting the intermediate product to the setting place becomes easy. Since the foaming agent is added to the heat-resistant concrete suitable for the cast floor according to claim 9, for example, the density of the intermediate product of the heat-resistant concrete that is transported to the driving place through the pipe is higher than that when the foaming agent is not added. Can also be reduced. Therefore, the weight of the intermediate product can be reduced, and the transportation work in the case of transportation to the driving place becomes easy.

[Brief description of drawings]

1A and 1B are explanatory views of a heat-resistant block suitable for a casting floor according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of particle size distribution of blast furnace slowly cooled slag used in the heat resistant block.

FIG. 3 is an explanatory diagram of particle size distribution of blast furnace slowly cooled slag used in the heat resistant block.

FIG. 4 is an explanatory view of a method for manufacturing the heat resistant block.

5 (A) and 5 (B) are cross-sectional views of a hot metal gutter, respectively.
It is a sectional view of a hot metal gutter.

FIG. 6 is an explanatory diagram of a method for producing heat-resistant concrete suitable for a cast floor according to an embodiment of the present invention.

FIG. 7 is an explanatory diagram of the compressive strength of a heat resistant block suitable for a cast floor according to an embodiment of the present invention.

FIG. 8 is an explanatory diagram of bending strength of the heat resistant block.

FIG. 9 is an explanatory diagram of compressive strength of heat-resistant concrete suitable for a cast floor according to an embodiment of the present invention.

FIG. 10 is an explanatory diagram of bending strength of the heat resistant concrete.

[Explanation of symbols]

10, 11: Heat-resistant block, 12: Engagement part, 13: Weighing machine, 14: Kneading machine, 15: Molding machine, 16: Curing room, 1
7: Cast bed, 18: Cast bed, 19: Hot metal gutter, 20: Hot metal gutter, 21: Weighing machine, 22: Mixer, 23: Concrete pump

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) // C04B 111: 28 C04B 111: 28 (72) Inventor Hidetoshi Tokuhara 9 Kawabatamachi, Hachimanto-ku, Kitakyushu, Fukuoka No. 27 Taihei Kogyo Co., Ltd. in Yawata Branch (72) Inventor Masato Kajiyama 9-27 Kawabuchicho, Yawatahigashi-ku, Kitakyushu, Kitakyushu, Fukuoka No. 27 Taihei Kogyo Co., Ltd. in Yawata Branch (72) Rin Nakamura 20 Shintomi, Futtsu, Chiba Prefecture -1 Nippon Steel Co., Ltd. Technology Development Division (72) Inventor Norio Nitta 20-1 Shintomi, Futtsu-shi, Chiba Nippon Steel Co., Ltd. Technology Development Division (72) Inventor Shojiro Nakajima Kitakyushu, Fukuoka Prefecture 1-20-7 Maruyama, Moji-ku, City (72) Inventor Satoshi Kawauchi 209 F-term, Moji-ku, Kitakyushu, Fukuoka Prefecture (reference) 4G012 PA29 PC15 4G033 AA11 AB02 AB23 BA01

Claims (9)

[Claims] 1. Portland cement, blast furnace cement,
And a cement raw material mainly composed of one or more of alumina cement, and a porous aggregate composed of blast furnace slowly cooled slag and / or blast furnace external water granulated slag having a porosity smaller than that of general blast furnace granulated slag. A heat-resistant block suitable for a cast floor, characterized in that the mixing ratio of the cement raw material and the porous aggregate is 1: 2 to 1: 5 by mass ratio. 2. Portland cement, blast furnace cement,
And a cement raw material mainly composed of any one or more of alumina cement, and a porous aggregate composed of blast furnace slowly cooled slag and / or blast furnace granulated slag having a porosity smaller than general blast furnace granulated slag, It contains a plasticizer capable of maintaining the shape of an intermediate product at the time of production, and the compounding ratio of the cement raw material and the porous aggregate is 1: 2 to 1: 5 by mass ratio.
A heat-resistant block suitable for a cast floor, characterized in that the plasticizer has a mass ratio of 0.0001 to 0.001 with respect to the cement raw material. 3. The heat-resistant block suitable for a casting floor according to claim 1, wherein the porous aggregate contains 90% by mass or more of particles having a particle diameter of 0.15 to 13 mm. A heat-resistant block suitable for cast floors that is characterized by 4. The heat-resistant block suitable for a cast floor according to claim 1, wherein a side portion of the heat-resistant block has a hooking portion on which adjacent heat-resistant blocks can be fitted to each other. A heat resistant block suitable for cast floors, which is characterized by being provided. 5. Portland cement, blast furnace cement,
And a cement raw material in which one or more of alumina cement is mixed with blast furnace slag fine powder for concrete, which is mainly composed of fine powder having a Bren value of 5000 cm ² / g or more, and a blast furnace granulated slag having a porosity of general A small aggregate of blast furnace slowly cooled slag and / or blast furnace granulated slag outside the porous aggregate is contained, and the mixing ratio of the cement raw material and the porous aggregate is 1: 2 to 1: 5 by mass ratio. Heat-resistant concrete suitable for cast floors, which is characterized by 6. The heat-resistant concrete suitable for a cast floor according to claim 5, wherein the porous aggregate has a particle size of 0.15 to 0.15.
A heat-resistant concrete suitable for a cast floor, which contains 90% by mass or more of 13 mm particles. 7. The heat-resistant concrete suitable for a casting floor according to claim 5, wherein the cement raw material contains 4 parts of the blast furnace slag fine powder for concrete.
Heat-resistant concrete suitable for a cast floor, which is characterized by containing 0 to 60 mass%. 8. The heat-resistant concrete suitable for a cast floor according to claim 5, wherein a delay type admixture capable of ensuring fluidity of an intermediate product during production is used as the cement raw material. On the other hand, the heat-resistant concrete suitable for a cast floor is characterized by containing 0.025 to 0.06 in mass ratio. 9. A heat-resistant concrete suitable for a cast floor according to any one of claims 5 to 8, wherein a foaming agent capable of reducing the weight of an intermediate product at the time of production is used for the cement raw material. A heat-resistant concrete suitable for a cast floor, characterized by containing 0.005 to 0.01 in a mass ratio.