JPH0967149A - Forming material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a forming material excellent in hardening property and fluidity and is suitable as an exterior material of buildings with good productivity by compounding a specified amt. of fly ash to a cement having a specified specific surface area and the amt. of C3 S component and then adding water. SOLUTION: To a cement (A) having >4000cm<2> /g specific surface area and containing >60wt.% C3 S (calcium silicate), (B) 50-70wt.% of fly ash is compounded and then water (C) is added by the amt. corresponding to 25-40wt.% of the solid content of the obtd. mixture to obtain a forming material. Moreover, an org. reinforcing fiber having 3 to 8mm fiber length (for example, polyvinylalcohol fiber) is preferably compounded by 1-5wt.% of the solid content of the forming material. By compounding a thickener (such as carboxymethylcellulose) by <1wt.% of the cement, separation between the org. reinforcing fiber and the cement can be prevented. Moreover, a dewatering agent is preferably compounded by <=0.5wt.% to the cement.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molding material used for manufacturing a building exterior material such as a roof tile or an outer wall material.

[0002]

2. Description of the Related Art Conventionally, fly ash on cement,
An organic reinforcing fiber, a thickener, and a water reducing agent were mixed, and water was added to the mixture to prepare a molding material. The molding material was supplied to a mold, compression molded, and cured and cured in the mold. After that, the mold is removed to manufacture an exterior material. Fly ash has a bearing effect that improves the fluidity of the cement.By incorporating this fly ash into the cement, the moldability of the molding material is increased and large plates and exterior materials with complicated shapes can be used. It can be manufactured.

[0003]

However, when a large amount of fly ash is contained in the cement, the strength of the exterior material is delayed, so that the strength required to remove the mold from the mold is exhibited in the exterior material. As a result, it takes a long time to cure, and there is a problem that the productivity of the exterior material cannot be improved. Further, if the compounding amount of fly ash is lowered in order to improve the productivity of the exterior material, there is a problem that the moldability of the molding material is lowered and a large plate or an exterior material having a complicated shape cannot be manufactured.

The present invention has been made in view of the above points, and an object thereof is to provide a molding material capable of improving productivity without lowering moldability.

[0005]

The invention according to claim 1 of the present invention provides C ₃ S with a specific surface area of 4000 cm ² / g or more.
It is characterized in that fly ash is blended in a ratio of 50 to 70% by weight to cement containing 60% by weight or more of the components, and water is added to this to prepare. In addition to the configuration of claim 1, the invention according to claim 2 of the present invention,
The organic reinforcing fiber having a fiber length of 3 to 8 mm is 1 to the solid content.
It is characterized by being mixed at a ratio of 5% by weight.

The invention according to claim 3 of the present invention is characterized in that, in addition to the constitution of claim 1 or 2, a thickener is blended in a proportion of 1% by weight or less with respect to the cement. To do. The invention according to claim 4 of the present invention, in addition to the constitution according to any one of claims 1 to 3, is such that the compounding amount of water is 25 to 40% by weight with respect to the solid content and 0 to the cement. The water-reducing agent is blended in a proportion of 0.5% by weight or less.

[0007]

Embodiments of the present invention will be described below. The cement has a specific surface area of 4000 cm ² /
It is possible to use an early-strength cement containing 60% by weight or more of C ₃ S (calcium silicate) component in an amount of g or more. As described above, since cement having a large specific surface area, that is, fine particles, has a large surface area and reacts quickly, the molding material 1 is rapidly cured, and the strength of the exterior material can be developed quickly. In addition, since the cement containing a large amount of C ₃ S component that is actively hydrated reacts quickly, the molding material 1 can be cured quickly, and the strength of the exterior material can be developed quickly. Can be higher. By using a cement that can accelerate the development of strength of the exterior material in this way, the curing time after molding can be shortened, and the number of curing chambers and molds required during curing can be increased. It is not necessary.

The upper limits of the specific surface area and the content of the C ₃ S component are not particularly limited, but the specific surface area is 600.
It is preferable that the content is 0 cm ² or less and the content of the C ₃ S component is 70% by weight or less. When the specific surface area exceeds 6000 cm ² or the content of the C ₃ S component exceeds 70% by weight, the reaction becomes too fast, and it becomes difficult to control the curing time of the molding material 1 and the moldability deteriorates. There is also a problem that micro cracks easily occur in the exterior material.

As fly ash, JIS A 6
Any of those conforming to 201 can be used, and this fly ash can be incorporated in a proportion of 50 to 70% by weight based on cement. The amount of fly ash is 5
If it is less than 0% by weight, the fluidity of the molding material 1 may be low and the moldability may be deteriorated. If the content of fly ash exceeds 70% by weight, the strength of the exterior material may be delayed. The problem occurs. That is, by blending fly ash in a proportion of 50 to 70% by weight with respect to the cement, the formability can be improved without delaying the development of the strength of the exterior material.

As the organic reinforcing fiber, polyvinyl alcohol fiber (vinylon), polypropylene fiber, or acrylic fiber can be used alone, but in order to increase the bending strength and impact strength of the exterior material, the above-mentioned fiber is used. It is preferable to use two or more kinds in combination, and for example, high-strength fiber (polyvinyl alcohol fiber or acrylic fiber) having a tensile strength of 10 g / denier or more and polypropylene fiber having a tensile elongation of 20% or more can be used in combination. The fiber length of the organic reinforcing fiber is 3 to 8 mm. If the fiber length of the organic reinforcing fibers is less than 3 mm, the strength of the exterior material cannot be increased, and if the fiber length exceeds 8 mm, the entanglement of the fibers becomes large and the formability may be deteriorated.

This organic reinforcing fiber is 1 to 5% by weight based on the solid content of cement, fly ash, thickener and the like.
Can be blended. If the content of the organic reinforcing fiber is less than 1% by weight, the strength of the exterior material cannot be increased, and if the content of the organic reinforcing fiber is more than 5% by weight, the fluidity becomes low and the moldability may be deteriorated. is there. As a thickener,
Cellulose ethers such as methyl cellulose, hydroxymethyl cellulose and carboxymethyl cellulose can be used. This thickener can be blended in a proportion of 1% by weight or less with respect to cement. However, if the blending amount exceeds 1% by weight, the viscosity of the molding material 1 becomes too high and the moldability may be lowered. is there. Further, the lower limit of the amount of the thickener to be blended is not particularly limited, but in order to prevent separation of the organic reinforcing fiber and the cement, it is preferable to blend in a proportion of 0.2% by weight or more with respect to the cement. ..

As the water reducing agent, lignin sulfonate, oxycarboxylic acid, or naphthalene sulfonic acid can be used, and the compounding amount thereof is 0.5% by weight or less with respect to the cement. When the compounding amount of the water reducing agent exceeds 5% by weight, curing of the molding material 1 may be delayed and productivity may be lowered. The lower limit of the amount of the water reducing agent is not particularly limited, but it is preferable to add the water reducing agent in an amount of 0.1% by weight or more relative to the cement in order to obtain the water reducing effect.

Next, a method for preparing the molding material 1 will be described. First, cement, fly ash, a thickener, and an organic reinforcing fiber are mixed and dispersed by a dry mixer such as an Eirich mixer. Next, water is added to this mixture (solid content) in a proportion of 25 to 40% by weight, and a water reducing agent is added to the mixture and mixed with an omni mixer or the like to obtain a pasty molding material 1. 25% by weight of water
If the amount is less than 40% by weight, the fluidity of the molding material 1 may be lowered and the productivity may be decreased. If the amount of water exceeds 40% by weight, it takes a lot of time to dehydrate and the productivity is decreased. There is a risk of

Next, a method of molding the molding material 1 will be described. The molding material 1 can be molded by any method, but can be compression-molded by using a mold 2 as shown in FIG. 1, for example. The male die 3 of the die 2 is formed by providing a core 4 having a sharp lower surface, and N is formed around the core 4.
An elastic body 5 made of BR or the like is provided. The female die 6 of the die 2 has a cavity 7 whose bottom surface is formed in a substantially V shape. Further, the female die 6 is provided with a plurality of drainage holes 8 which are open to the bottom surface and the bottom surface of the cavity 7.

Then, as shown in FIG. 1 (a), the molding material 1 is supplied to the cavity 7, the male die 3 is moved downward, and the core 4 is fitted into the cavity 7 of the female die 6 and then, as shown in FIG. b)
As shown in FIG. 3, the molding material 1 is compressed and molded, and at the same time, the molding material 1 is dehydrated by vacuum suction from the drain hole 8, and then the molding material 1 is cured and hardened in the mold 2. Thus, the exterior material (the roof tile in FIG. 1) can be manufactured. The molding pressure and the molding time can be arbitrarily set to values suitable for dehydrating the molding material 1. For example, the molding pressure can be 30 to 90 kg / cm ² and the molding time can be 5 to 15 seconds.

[0016]

EXAMPLES The present invention will be described in detail below with reference to examples. (Example 1) With a compounding ratio shown in Table 1, a specific surface area of 4350c
Cement containing 66% by weight of C ₃ S component in m ² / g, fly ash, polyvinyl alcohol fiber (Vinylon), polypropylene fiber (Taflight, manufactured by Sun Kasei Co., Ltd.), and methyl cellulose as a main component. A viscous agent (High Metroze 4000, manufactured by Shin-Etsu Chemical Co., Ltd.) and a water reducing agent are mixed, and water is added to this to prepare a molding material 1,
Vacuum compression dehydration was performed while pressurizing with a mold 2 shown in FIG. 1 and performing compression molding, followed by curing and demolding to obtain an exterior material. Table 1
The compounding amount of the water reducing agent is shown in the compounding amount with respect to the cement, and water is shown with the compounding amount relative to the solid content.

Example 2 A molding material 1 was prepared by using the same materials as in Example 1 at the compounding ratios shown in Table 1, and an exterior material was obtained in the same manner as in Example 1. (Comparative Example 1) A molding material 1 having a specific surface area of 3200 cm ² / g and containing 50% by weight of a C ₃ S component was used. An exterior material was prepared in the same manner as in Example 1.

(Comparative Example 2) A molding material 1 was prepared by using the same materials as in Example 1 at the compounding ratios shown in Table 1, and an exterior material was obtained in the same manner as in Example 1. (Comparative Example 3) A molding material 1 was prepared using the same materials as in Comparative Example 1 at the compounding ratios shown in Table 1, and an exterior material was obtained in the same manner as in Example 1.

The moldability and the like of Examples 1 and 2 and Comparative Examples 1 to 3 were evaluated. Table 2 shows the results. In Example 1, the curing temperature was changed to 40 ° C, 50 ° C, 60 ° C,
The change in bending strength of the exterior material with time was measured, and Comparative Example 1
At the curing temperature of 40 ℃ and 60 ℃,
The bending strength of the exterior material after the elapse of time was measured. The results are shown in FIG. In Table 2, ◯ means no problem and Δ means some problem.

[0020]

[Table 1]

[0021]

[Table 2]

As can be seen from Table 2, there is no problem in all the items in Examples 1 and 2, and in Example 1, the curing at the temperature of 50 ° C. or higher for 6 hours makes the bending strength of the exterior material demolded. expressed to the extent that can withstand (about 110 kg / cm ^2), also expressed to the extent that the bending strength of the outer package can withstand demolding by causing curing for 6 hours at a temperature of example 2 at 60 ° C., example 1, Both of them could be removed from the mold by curing for a short time. In Comparative Example 1, since the amount of fly ash mixed with the cement was small, the fly ash adhered to the mold and had some problems, and it was difficult to fill the molding material 1 into the details of the mold, and there was some problem with sheet deformation. In Comparative Example 2, since the amount of fly ash mixed with the cement was small, the fly ash adhered to the mold and had some problems. Further, the reactivity was fast and the fluidity was low, and the molding material 1 was filled in the details of the mold. Difficult,
Therefore, a fine shape cannot be obtained, and there is a problem in sheet deformation. In Comparative Example 3, since the amount of fly ash mixed with the cement was large, compared to Comparative Examples 1 and 2, the problems of die attachment and sheet deformation were slightly improved, but the specific surface area of the cement was small, and C ₃ Since the content of the S component was small, it took about 24 hours when cured at a temperature of 60 ° C., and the bending strength of the exterior material was developed to such an extent that it could withstand demolding.

Further, as can be seen from FIG. 2, in Example 1, when the curing temperature is 50 ° C. and 60 ° C., the bending strength of the exterior material can withstand demolding in about 6 hours (about 110 kg / c).
m ² and indicated by A in FIG. 2), and it can be seen that the curing of the molding material 1 is fast. On the other hand, in Comparative Example 1, even when the curing temperature was 60 ° C., the bending strength of the exterior material was developed to such an extent that it could withstand demolding in about 24 hours, and when the curing temperature was 40 ° C., the exterior material was formed even after 24 hours. The bending strength of the material does not appear to the extent that it can withstand demolding.

[0024]

As described above, the invention according to claim 1 of the present invention has a specific surface area of 4000 cm ² / g or more and a cement containing 60% by weight or more of C ₃ S component and 50 to 70% by weight of fly ash. %, And water was added to the mixture to prepare C ₃ with a specific surface area of 4000 cm ² / g or more.
By using the cement containing S component in an amount of 60% by weight or more, the curing can be accelerated, and the fly ash is added to the cement in an amount of 50 to 70.
By blending in the proportion of% by weight, the fluidity can be increased and the productivity can be improved without lowering the moldability.

According to the second aspect of the present invention, the organic reinforcing fiber having a fiber length of 3 to 8 mm is used in an amount of 1 to 5 with respect to the solid content.
Since the composition is blended in a weight percentage, the reinforcing effect of the organic reinforcing fiber can be increased and the strength of the exterior material can be increased by including 1% by weight or more of the organic reinforcing fiber with a fiber length of 3 mm or more. It is possible, and the fiber length is 8
By containing 5% by weight or less of the organic reinforcing fiber in mm or less, the fluidity can be increased and the moldability can be prevented from being lowered.

Further, in the invention according to claim 3 of the present invention, since the thickener is blended in a ratio of 1% by weight or less with respect to the cement, it is possible to prevent the viscosity from becoming too high,
It is possible to prevent deterioration of moldability. Further, in the invention according to claim 4 of the present invention, the water reducing agent is added in an amount of 25 to 40% by weight based on the solid content and 0.5% by weight or less based on the cement. By adjusting the amount of water to be 25 to 40% by weight based on the solid content, it is possible to prevent the fluidity from becoming low and the dehydration to take a long time so that the productivity does not become low. In addition, by adding a water reducing agent in an amount of 0.5% by weight or less with respect to cement, curing can be accelerated and productivity can be prevented from being lowered. is there.

[Brief description of drawings]

FIG. 1A is a cross-sectional view showing a molding process of the present invention,
(B) is sectional drawing which shows the shaping | molding same as the above.

FIG. 2 is a graph showing changes in bending strength over time of Example 1 and Comparative Example 1 above.

[Explanation of symbols]

 1 molding material

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Claims (4)

[Claims] 1. A carbon having a specific surface area of 4000 cm ² / g or more.
₃ A molding material comprising a cement containing 60% by weight or more of S component and 50 to 70% by weight of fly ash, and water. 2. The molding material according to claim 1, wherein the organic reinforcing fiber having a fiber length of 3 to 8 mm is mixed in a proportion of 1 to 5% by weight based on the solid content. 3. The method according to claim 1, wherein the thickener is mixed in the cement at a ratio of 1% by weight or less.
The molding material described in 1 .. 4. The amount of water blended is 25 to 40 relative to the solid content.
The molding material according to any one of claims 1 to 3, wherein the water-reducing agent is added in an amount of 0.5% by weight or less with respect to the cement, in addition to the weight%.