JP2000044320A - Inorganic hardened body and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a hardened body having excellent appearance, etc., from a uniform material slurry even using water in an amount for securing fluidity by mixing a hydraulic material containing a steelmaking slag and a gypsum with a water reducing agent and hardening the mixture. SOLUTION: A hydraulic material in an amount of preferably 100 pts.wt. having the weight ratio of gypsum/steelmaking slag of preferably 1/10 to 1/5 is mixed with preferably 0.1-3 pts.wt. of a water reducing agent and hardened. Optionally Portland cement as the hydraulic material in the ratio of <=80 wt.% based on the total of the hydraulic materials is added to the mixture. Optionally blast furnace water granulated slag in a ratio of <=50 wt.% is similarly added. A reinforcing fiber (e.g. polyvinyl alcohol-based fiber) in an amount of 1-5 pts.wt. based on 100 pts.wt. of the hydraulic material is added to the mixture, if required. An aggregate component in the ratio of <=70 pts.wt. based on 100 pts.wt. of the hydraulic material is added to the mixture, if required. The weight ratio of the raw material mixture to water is preferably 3:1 to 1:1.

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 phenomenon of separation of solid raw material and water,
On the contrary, there has been a problem that the moldability is reduced, the surface after molding becomes uneven, the appearance is not good, and the physical properties such as the bending strength are not sufficient.

Accordingly, the invention of this application takes advantage of the characteristics of the above-mentioned hardened inorganic hardened material obtained by mixing steelmaking slag with gypsum, and at the same time, it is possible to use cast molding even if the amount of water for ensuring fluidity is sufficient. It is an object of the present invention to provide a new inorganic cured product and a method for producing the same, which make it possible to obtain a molded product having a uniform appearance, a good appearance, and a sufficient bending strength by making the material slurry 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. In addition, the present invention provides an inorganic cured product characterized in that a water reducing agent is blended with a hydraulic material. Secondly, the invention of this application relates to an inorganic cured product in which the water-reducing agent is blended at a ratio of 0.05 to 2 parts by weight with respect to 100 parts by weight of the hydraulic material. Third,
Fourth, an inorganic hardened material containing 80% by weight or less of Portland cement as a hydraulic material component, and fourthly, an inorganic hardened material containing 50% by weight or less of granulated blast furnace slag as a hydraulic material component. Fifth, the hydraulic material 10
Provided is an inorganic cured product in which 1 to 5 parts by weight of a reinforcing fiber is blended with respect to 0 parts by weight.

[0007] The invention of this application is, sixthly, a method for producing any one of the aforementioned 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.

[0008]

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.

Hydraulic materials in which steelmaking slag is mixed with gypsum are characterized by a short setting time, and provide an inorganic hardened material which is fast-setting and excellent in productivity. However, the mixing of portland cement or granulated blast furnace slag Is to delay the curing time in the production process (handling)
Prolongs the time and improves strength. In practice,
The proportion of Portland cement is suitably set so as to be 80% by weight or less of 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 a water reducing agent is added to the raw material for casting in addition to the above hydraulic material. This water reducing agent is a surfactant having a large dispersing ability that does not cause excessive delay of coagulation or excessive entrainment in air, such as lignin sulfonate, which has a high molecular weight, naphthalene sulfonate formaldehyde condensation, etc. Or a salt of a polycarboxylate, a salt of a melaminesulfonic acid formaldehyde condensate, or a mixture of one or more components.

As such water reducing agents, those generally known as AE water reducing agents, high performance water reducing agents, high performance AE water reducing agents and the like can be used. The compounding amount is preferably 0.1 to 3 parts by weight based on 100 parts by weight of the hydraulic material. More preferably, 0.3 to 2.5
It is the ratio of parts by weight. Even when the water content is ensured by the addition of the water reducing agent, the solid content and the water constitute a uniform aqueous slurry without causing phase separation, and provide good moldability even when the water content is to be ensured. The surface of the cured product obtained by casting and casting is good in appearance and the bending strength of the cured product is 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. Generally, it is preferable to mix 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 an aggregate component, silica stone, lime sand, or the like is 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, a water reducing agent, 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 and water during this production is
The weight ratio of the raw material mixture: water is 3: 1 to 1: 1.5.
Is appropriate. If the water content is less than this range, even if a water reducing agent is blended, the fluidity as a raw material slurry for casting cannot be ensured, and the slurry becomes non-uniform. 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.

[0018]

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.

The resulting cured product was evaluated for appearance and demolding hardening, and was 40 mm wide and 150 mm long.
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 chemical manufactured by Chemical Co., Ltd., vinylon used was RM182 (4 mm length) manufactured by Kuraray Co., Ltd., and the water reducing agent used was Kao Corporation's high-performance AE water reducing agent “Mighty 21VS”.

[0022]

[Table 1]

[0023]

[Table 2]

As is clear from Table 1 showing Examples of the present invention and Table 2 showing Comparative Examples, even when the amount of water is large, the cured product containing the water reducing agent does not impair the quick-setting property. It has excellent appearance and good bending strength.
In addition, blending the required amount of Portland cement and granulated blast furnace slag delays the curing time (handling) time,
Adjustments suitable for the production process can be made, and the bending strength can be improved.

[0025]

As described in detail above, according to the invention of this application, even when the flow rate is ensured by increasing the water content of the molding material, the appearance is improved by the uniformizing effect of the slurry without impairing the quick-setting property. And a molded cured product having excellent bending strength can be obtained. In addition, hardening (handling) by mixing required amount of Portland cement and granulated blast furnace slag
The time can be adjusted, and the strength can be 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 a water reducing agent is added to the hydraulic material. 2. The inorganic cured product according to claim 1, wherein a water reducing agent is added in an amount of 0.1 to 3 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.