JP2000044321A - Inorganic hardened body and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a hardened body having excellent appearance and flexural strength by hardening a hydraulic material containing a steelmaking slag, a gypsum and one or more methyl celluloses. SOLUTION: A hydraulic material in an amount of 100 pts.wt. obtained by mixing a gypsum with a steelmaking slag in the weight ratio of 1/10 to 1/5 is mixed with 0.05-2 pts.wt. of one or more of methyl celluloses, 1-5 pts.wt. of a reinforcing fiber, <=70 pts.wt. of an aggregate component such as silica rock, etc., to give a raw material mixture, which is incorporated with water in an amount to make the raw material mixture/water 3/1 to 1/1 by weight to give a slurry. The slurry is subjected to cast molding and cured to give an inorganic hardened body. Portland cement and blast furnace water-granulated slag are used as the hydraulic material besides the gypsum and the steelmaking slag. Methyl cellulose, hydroxymethyl cellulose, hydroxypropyl methyl cellulose, etc., may be cited as the methyl cellulose. An organic fiber such as polyvinyl alcohol-based fiber, etc., or an inorganic fiber such as glass wool, etc., is used as the reinforcing fiber.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inorganic cured product and a method for producing the same. For more information,
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inorganic cured material useful as a building material, particularly as an exterior corner or a tile, and a method for producing the same.

[0002]

2. Description of the Related Art Heretofore, as a molding material such as a building material, for example, an exterior corner or a tile tile, a molding obtained by mixing a gypsum with a reinforcing fiber and casting it has been known. In this gypsum molded body, it has been considered that it is effective to mix a special cement such as alumina cement or jet cement because it has been an issue to shorten the curing time and increase the productivity. However, these special cements were expensive and impractical.

On the other hand, when steelmaking slag is compounded, it can be hardened in a short time, and since steelmaking slag is inexpensive as a by-product of steel production, its use as a compounding component is not possible. Attention has been paid.

[0004]

However, although the steelmaking slag has the above-mentioned advantages, it is kneaded with water together with a gypsum component to obtain a casting material for filling a mold. However, at this time, if the amount of water is increased to improve the fluidity of the casting material, the slurry is likely to cause a bleeding phenomenon of separation of the solid raw material component and water, and the moldability is rather reduced, There has been a problem that the surface is not uniform, the appearance is not good, and the bending strength is not sufficient.

[0005] Therefore, the invention of this application takes advantage of the characteristics of the above-described inorganic hardened body in which steelmaking slag is blended with gypsum and, even if the amount of water for ensuring fluidity,
It is an object of the present invention to provide a new inorganic cured product and a method for producing the same, which can obtain a molded product having a good appearance and a sufficient bending strength by making a material slurry for casting molding uniform.

[0006]

Means for Solving the Problems According to the invention of the present application, as a solution to the above-mentioned problems, firstly, there is provided an inorganic cured product obtained by curing a hydraulic material containing steelmaking slag and gypsum. , One of methylcellulose for hydraulic material
Provided is an inorganic cured product, characterized in that at least one kind is blended.

[0007] The invention of the present application also relates to a second aspect of the present invention, in which the inorganic cured product contains 0.05 to 2 parts by weight of methylcellulose in 100 parts by weight of the hydraulic material. Thirdly, an inorganic hardened material containing 80% by weight or less of Portland cement as a hydraulic material component, and fourthly, a granulated blast furnace slag containing 50% by weight or less as a hydraulic material component. Fifth, the present invention provides an inorganic cured product containing 1 to 5 parts by weight of a reinforcing fiber with respect to 100 parts by weight of a hydraulic material.

[0008] In a sixth aspect of the present invention, there is provided a method for producing any one of the above-mentioned inorganic cured products,
A method for producing an inorganic cured product, which comprises kneading a raw material mixture containing a hydraulic material with water, and then molding and curing the mixture to form an inorganic cured product, is described in the seventh aspect. Provided is a method for producing an inorganic cured product having a weight ratio of 3: 1 to 1: 1.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention of this application has the above-mentioned features, and the embodiments thereof will be described below. First, the hydraulic material of the present invention including steelmaking slag basically consists of gypsum and steelmaking slag. As the gypsum in this case, a commercially available product, a product obtained as a by-product of petrochemical desulfurization, and the like can be used as in the past, and steelmaking slag can also be used as a by-product associated with steel production.

The mixing ratio of gypsum to steelmaking slag is suitably in the range of 1/10 to 1/5, more preferably 1/9 to 1/7, by weight of gypsum / steelmaking slag. In addition, the hydraulic material may be configured to include not only the above-mentioned gypsum and steelmaking slag, but also Portland cement as a component thereof, and further, granulated blast furnace slag as necessary.

[0011] Hydraulic materials in which steelmaking slag is mixed with gypsum are characterized by a short setting time and give an inorganic hardened body having excellent productivity. However, the mixing of Portland cement or granulated blast furnace slag has the following disadvantages. On the contrary, the curing time is delayed, so that the handling (handling) time in the production process is lengthened, and the strength can be improved. In practice, it is appropriate that the proportion of Portland cement be 80% by weight or less based on the total amount of the hydraulic material. More preferably, the content is appropriately 70% by weight or less.

If the mixing ratio exceeds 80% by weight of the hydraulic material, the delay of the curing time becomes extremely large, which is not practical. The granulated blast furnace slag is preferably blended at 50% by weight or less based on the total amount of the hydraulic material.
If it exceeds 50% by weight, the strength of the cured product will decrease.

A feature of the present invention is that, in addition to the above-mentioned hydraulic material, at least one kind of methylcellulose is added to the raw material for casting. The methylcellulose belongs to the alkylcellulose, and examples thereof include methylcellulose and hydroxyalkylmethylcellulose such as hydroxyethylmethylcellulose and hydroxypropylmethylcellulose. Among them, methylcellulose is shown as a more preferable one. The blending amount is 0.05 to 100 parts by weight of the hydraulic material.
Preferably it is 2 parts by weight. More preferably, 0.1
１．５1.5 parts by weight.

By the addition of this methylcellulose,
Even if the amount of water to ensure fluidity,
The solid content and water constitute a uniform aqueous slurry without causing phase separation, maintain good moldability, and the surface of the cured product obtained by casting has good appearance, and the bending of the cured product The strength will also be improved. Further, in the cured product of the present invention, a reinforcing fiber and an aggregate component may be further added as necessary. The reinforcing fibers may be natural or synthetic short fibers, for example, organic fibers such as vinylon, pulp, and polypropylene, and various types of inorganic fibers such as glass wool and rock wool.

In general, it is preferable to add such a reinforcing fiber in an amount of 1 to 5 parts by weight based on 100 parts by weight of the hydraulic material. If the amount is less than 1 part by weight, the reinforcing effect is not sufficient, and if it exceeds 5 parts by weight, dispersion of the fibers tends to be difficult, and improvement of the reinforcing effect cannot be expected much. In addition, organic fibers lose their properties as natural materials.

As the aggregate component, silica stone, lime sand and the like are used. It is preferable to mix this in a proportion of 70 parts by weight or less based on 100 parts by weight of the hydraulic material. If the amount exceeds 70 parts by weight, the strength of the cured product decreases. Of course, if necessary, the inorganic cured product of the present invention may be appropriately blended with a coloring agent, a photo-deterioration inhibitor and the like as trace components.

In the production of the inorganic cured product of the present invention having the above composition, for example, as shown in FIG. 1, steelmaking slag, gypsum, methylcellulose, Portland cement, granulated blast furnace slag, and reinforcing fibers are used. The compounded raw material is kneaded with water to form a slurry, which is used for casting and curing. The ratio of the raw material mixture to water at the time of this production was 3: 1 by weight of the raw material mixture: water.
It is appropriately set to と す る 1: 1.5. If the water content is less than this range, even if methylcellulose is blended, the fluidity of the raw material slurry for casting cannot be ensured, and the slurry becomes uneven, while the water content is unnecessary. If the amount is too large, the load for dehydration becomes too large for molding, and the curing time becomes long.

Curing after molding may be air drying, but curing by heating is also effective in terms of productivity and physical properties of the cured product. Therefore, the present invention will be described in more detail with reference to the following examples. Of course, the present invention is not limited to the following embodiments.

[0019]

EXAMPLE After a raw material mixture shown in Table 1 and water were stirred for about 5 minutes by a planetary mixer, a molding material slurry was filled in a molding die having a structure shown in FIG. The mold of FIG. 2 has a lower mold (1) and an upper mold (2), and the upper mold (2)
Is a hollow body, and has a dewatering cloth (20) and a plurality of dewatering holes (21) on a mold surface for pressing the molding material slurry (3). The extracted water is extracted from the hollow portion (22) by a vacuum extraction pipe (23). Then, a pressing force (P) is applied to the upper mold (2) to perform casting and press molding.

After the molding material was filled with the molding material slurry (3), a pressure of 4 MPa was applied to the upper mold (2) to perform dehydration under pressure to perform molding. Thereafter, as shown in FIG. 3, the obtained molded body (5) is released (removed) from the receiving plate (4).
It was cured by steam curing at a temperature of 60 ° C. for 1 hour. FIG. 3 also shows an example of the dimensions (mm). The cured molded body was removed from the receiving plate (4), and left in a wet air for one week in a state where a plurality of the molded products were stacked. Thereafter, it was air-dried for another two weeks.

With respect to the obtained cured product, the appearance was evaluated, and a sample having a width of 40 mm and a length of 150 mm was cut out and subjected to a bending test with a span of 100 mm. The results are shown in Table 1. In addition, the same molding and evaluation test as described above was performed for the formulations shown in Table 2 for comparison.

Of the components shown in Tables 1 and 2, steelmaking slag was manufactured by Aichi Steel Co., Ltd., gypsum was titanium gypsum of Ishihara Sangyo Co., Ltd., and granulated blast furnace slag was Nippon Steel Corporation. The product manufactured by Chemical Co., Ltd., the vinylon used was RM182 (4 mm length) manufactured by Kuraray Co., Ltd., and the methylcellulose used was manufactured by Shin-Etsu Chemical Co., Ltd.

[0023]

[Table 1]

[0024]

[Table 2]

As is clear from Table 1 showing Examples of the present invention and Table 2 showing Comparative Examples, even when the water content is large, a cured product containing methylcellulose has excellent appearance and bending strength. It will be good. The addition of the required amount of Portland cement or granulated blast furnace slag delays the hardening time (handling) time, enables adjustment suitable for the production process, and improves the bending strength.

[0026]

As described in detail above, according to the invention of this application, even when the fluidity is ensured by increasing the water content of the molding material, the appearance is excellent due to the effect of homogenizing the slurry, and the bending strength is good. A molded cured product is obtained. Further, the curing (handling) time can be adjusted by adding a required amount of Portland cement or granulated blast furnace slag, and the strength is also improved.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a manufacturing process of the present invention.

FIG. 2 is a cross-sectional view illustrating a mold in an example.

FIG. 3 is a cross-sectional view illustrating a state of removal of a sheet by a receiving plate.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lower mold 2 Upper mold 20 Dehydration cloth 21 Dehydration hole 22 Hollow part 23 Decompression extraction pipe 3 Molding material slurry 4 Receiving plate 5 Molded object

Claims (7)

[Claims] 1. An inorganic cured product obtained by curing a hydraulic material containing steelmaking slag and gypsum, wherein one or more methylcelluloses are blended with the hydraulic material. Cured body. 2. The inorganic cured product according to claim 1, wherein one or more methylcelluloses are blended in an amount of 0.05 to 2 parts by weight based on 100 parts by weight of the hydraulic material. 3. The inorganic cured product according to claim 1, wherein 80% by weight or less of Portland cement is blended as a hydraulic material component. 4. The inorganic cured product according to claim 1, further comprising 50% by weight or less of granulated blast furnace slag as a hydraulic material component. 5. The inorganic cured product according to claim 1, wherein 1 to 5 parts by weight of a reinforcing fiber is blended with respect to 100 parts by weight of the hydraulic material. 6. The method for producing an inorganic cured product according to claim 1, wherein the raw material mixture containing a hydraulic material is kneaded with water, and then molded and cured to obtain an inorganic cured product. A method for producing an inorganic cured product, comprising: 7. The weight ratio of the raw material mixture to water is from 3: 1 to
The method for producing an inorganic cured product according to claim 6, wherein the ratio is 1: 1.