JPH0732329A - Prefabricating method of pc board tile using highly fluid mortar - Google Patents

Abstract

PURPOSE:To obtain a prefabricating method of a PC board tile wherein a joint of the tile is beautifully finished, and the tile is restrained from peeling off with strong adhesion. CONSTITUTION:Highly fluid mortar which contains 10-50 pts.wt. of clinker powder containing at least 50wt.% of calcium aluminate compound expressed by 3CaO.3Al2O3.CaSO4 or 12CaO.7Al1O3 and 5-50 pts.wt. of gypsum powder to 100 pts.wt. of Portland cement in the ratio is poured onto a rear surface of a tile. After placing a concrete thereon, the concrete is cured, and separated from a form.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a PC board tile in which tiles are previously attached to a concrete PC board.
In addition, the present invention relates to a PC board tile prefabrication method for uniformly improving the adhesion strength of the tile to the concrete PC board without any defects.

[0002]

2. Description of the Related Art Conventionally, in order to manufacture PC board tiles by a pre-attachment method, tiles with the back side facing upward are spread in a formwork, and concrete or the like is directly placed on the tiles.
Alternatively, a method has been used in which ordinary cement mortar is spread on the back surface of this tile, then concrete or the like is cast, and this is cured and demolded.

[0003]

However, in the above-mentioned construction method, the joints of the tiles are often not uniformly filled with concrete or mortar, and color unevenness or pinholes are generated in the tile joints of the product after demolding. Since it is easy, the repairing mortar was often embedded in the joints from the tile surface side to perform color matching and compensation. In addition, a so-called junker or the like, which is not dense, may occur between the tile and the concrete PC board that is the base of the tile. However, since this is difficult to inspect, it was shipped as it was, and there was a risk that the tiles would partly fall off after being installed.

Furthermore, recently, PC curtain walls with tile makeup have been widely used, and PC board tiles with color joints have also been used due to design requirements. However, this product is manufactured by a method of manually burying the color mortar in the joints of the PC board tile manufactured by the above-mentioned method, and the cost is high because it is a very laborious process.

In order to solve these problems, high fluidity mortar (S
It has been proposed to apply L material) to evenly fill joints and prevent junkers due to its fluidity. As the conventional high-fluidity mortar used in this method, gypsum-based and cement-based are known, but of these, the gypsum-based one has the drawback of poor water resistance and low surface hardness. The cement-based cement has the drawback that it has a long curing time and tends to cause shrinkage cracks after curing, which makes it unsuitable as a mortar for bonding tiles to concrete. The present invention has been made to solve the above problems, and therefore its purpose is to prevent the tiles from peeling off over a long period of time, and to prevent color unevenness or pinholes in tile joints, and to improve joints by reworking. An object of the present invention is to provide a method for pre-applying a PC board tile that does not require filling or coloring work.

[0006]

[Means for Solving the Problems] The above-mentioned problems are solved by laying tiles with the back side facing upward in a formwork, pouring high-fluidity mortar onto the back side of this tile, and further onto it concrete, reinforced concrete or lightweight concrete. was cured After Da設and in the previous with method of demolding to PC board tiles, the high fluidity mortar is represented by Portland _{cement, 3CaO · 3Al 2 O 3 ·} CaSO 4 or 12CaO · 7Al ₂ O ₃ A clinker powder containing 50% by weight or more of a calcium aluminate compound alone or in a total amount, and gypsum powder,
And the blending ratio of each of the above components is Portland cement 1
This can be solved by providing a pre-attachment method in which the clinker powder is 10 to 50 parts by weight and the gypsum powder is 5 to 50 parts by weight with respect to 00 parts by weight. The above-mentioned high-fluidity mortar preferably contains a colorant, a water-reducing agent, a thickener, a defoaming agent, a reaction control agent, an admixture, and / or an aggregate in addition to the above components.

The present invention will be described in detail below. The present invention is a pre-installation method that uses a high-fluidity mortar for joining the back surface of a tile and a concrete PC board. As this high-fluidity mortar, it has a significantly faster hardening property and a lower shrinkage than conventional ones. It is resistant to cracking, can maintain strength for a long period of time, has excellent stability and uniform filling properties, and also has self-leveling properties, and gives a good joint surface when filled in tile joints. It was brought about by the discovery. The composition of this high-fluidity mortar was found as follows.

[0008] The inventors of the present invention poured the mortar having fluidity onto the surface of hot concrete placed in a predetermined formwork to confirm the adhesion between the high-fluidity mortar and the splicing concrete, and steamed it. After curing, the appearance was observed and the adhesive strength with the base concrete was measured.
As a result, it was found that, as a property other than the fluidity of the high-fluidity mortar, its hardening rate has a significant influence on the occurrence of cracks. That is, JIS R
When measured by the test method of 5201, if the curing start time is delayed to more than 6 to 7 hours, cracks will occur in the cured product. Therefore, a high-fluidity mortar having an early curing property was searched for such that the curing start time is within 7 hours at room temperature, more preferably within 6 hours.

In the process of this search, the composition of the high-fluidity mortar to be used was variously changed, and the relationship between this and the setting time was investigated.
3Al ₂ O ₃ · CaSO ₄ or 12CaO · 7Al ₂
A series of calcium aluminate compounds such as O ₃
It has been found that by blending 0% by weight or more of clinker powder and gypsum, early hardening can be imparted to the obtained high-fluidity mortar. Also at this time,
If the mixing ratio of the clinker powder is less than 10 parts by weight with respect to 100 parts by weight of Portland cement, the early curing property becomes insufficient, and if it exceeds 50 parts by weight, the curing time is too fast and workability and adhesive strength are poor. It was also found to decrease. Therefore, the relative weight ratio when the clinker powder is mixed with the high-fluidity mortar is 10 to 50 parts by weight, preferably 15 to 30 parts by weight, based on 100 parts by weight of Portland cement.

On the other hand, as a result of investigating the mixing ratio of the gypsum powder to the high-fluidity mortar having an early hardening property, when less than 5 parts by weight to 100 parts by weight of Portland cement to be mixed, the strength of the hardened product is insufficiently expressed. It was found that when the amount exceeds 50 parts by weight, the dimensional stability of the cured product becomes poor due to so-called delayed expansion. Therefore, the range of the relative mixing ratio of gypsum powder to 100 parts by weight of Portland cement is 5 to 50 parts by weight, preferably 10 to 4 parts by weight.
It is set to 0 parts by weight. The gypsum used here may be dihydrate gypsum, hemihydrate gypsum, anhydrous gypsum or a mixture thereof, but anhydrous gypsum is most suitable from the viewpoint of strength development.

The above-mentioned high-fluidity mortar contains known colorants, water-reducing agents, thickeners, defoamers, reaction control agents, admixtures, and / or aggregates in addition to the above-mentioned components. Is preferred. As a result, not only the early curing property, but also various properties required for carrying out the method of the present invention, such as color tone, workability, fluidity, and stability, or the product P
It is possible to obtain a high-fluidity mortar satisfying the properties required for the C plate tile. In particular, it has been found that when a colorant is blended with this high-fluidity mortar, color joints with a good surface condition can be obtained regardless of post-treatment.

[0012]

EXAMPLES Examples of the present invention will be described below. (High-fluidity mortar) Regarding the high-fluidity mortar (Examples 1 and 2) that can be used in the prefabricated method of the present invention, and the example of the high-fluidity mortar outside the scope of the present invention (Comparative Example 1), Ingredients and blending ratios are shown in Table 1.

[0013]

[Table 1]

In Table 1, Comparative Example 1 is a formulation example according to a commercial product. Clinker in the table means 3CaO
· 3Al ₂ O ₃ · CaSO ₄ and 12CaO · 7Al ₂ O
It is a clinker powder containing 72% by weight in total of ₃ and ₃ . The water reducing agent in the table is a melamine resin, the thickening agent is methyl cellulose, the defoaming agent is a silicone resin, the reaction inhibitor is an oxycarboxylic acid compound, and the aggregate is 5
This is No.

Next, with respect to Examples 1 and 2 and Comparative Example 1 shown in Table 1 and a commercially available high-fluidity mortar (Comparative Example 2), the flow value at 20 ° C., the setting time and the compression strength of the cured product , The flow value at 35 ° C., the compression strength and surface condition of the cured product, and the surface condition after steam curing were measured or observed. The results are shown in Table 2.

[0016]

[Table 2]

In Table 2, the flow value is an inner diameter of 50 m.
A value obtained by standing a pipe (volume = 100 cm ³ ) having a height of m and a height of 51 mm on a glass plate, filling each of the high-fluidity mortar slurries with the pipe, and then pulling up the pipe to measure the diameter of the slurry spread in a conical shape. Is. The condensation time and the compression strength were measured according to the measuring method of JIS R 5201, and the curing was performed in air. As for the surface condition after curing, the kneaded product was poured into a slate mold having a size of 30 cm × 30 cm so as to have a thickness of 5 mm, and cracks were visually observed after curing. The steam curing was carried out by preheating at 20 ° C. for 3 hours, then raising the temperature to 65 ° C. at a rate of 20 ° C./hour, maintaining at 65 ° C. for 3 hours, and then allowing to cool.

From the results shown in Table 2, the high fluidity mortars (Examples 1 and 2) that can be used in the method of the present invention are 20.
It is clear that the compressive strength of the cured product at 35 ° C. and 35 ° C. is sufficiently high, and the surface state of the cured product after curing at 35 ° C. or after steam curing is good without cracking. On the other hand, formulation examples outside the scope of the present invention (Comparative Example 1)
As for the commercially available product (Comparative Example 2), cracking and blistering occurred due to steam curing because the curing rate was slow.

(Embodiment 3) 1 cm of the slurry of the above-mentioned Embodiment 2 is placed on each of three molds having a size of 1 m × 2 m and a depth of 15 cm.
Poured into the thickness of. Immediately after pouring the slurry, one of them was poured 30 minutes after the pouring of the slurry, and the other one was poked 60 minutes after the pouring of the slurry.

[0020]

[Table 3]

3 after concrete splicing is completed
After the lapse of time, these were heated to 65 ° C. at a rate of 20 ° C./hour, kept at this temperature for 3 hours, and then naturally cooled to perform steam curing. Next, outdoor exposure is performed, and on the 14th day of age,
Using a diamond cutter, form a notch reaching the concrete surface from the mortar side to a size of 4 cm × 4 cm, attach an attachment strength measurement attachment with an epoxy resin adhesive to this part, and after curing the epoxy resin adhesive, build it The adhesion strength was measured by a Ken-type tensile tester. The results are shown in Table 4.

[0022]

[Table 4]

This result shows that concrete splicing is 6
Even after 0 minute, it shows that the adhesion strength is kept at 27 kgf / cm ² .

(Example 4) A 9.5 cm x 4.5 cm tile was spread on a 1 m x 2 m, 15 cm deep mold with the back side facing upward, and 4 cm of the slurry of Example 2 was placed on the tile.
It was poured to the thickness of. After 3 hours, steam curing was performed under the same conditions as in Example 3. No defects such as pinholes and color unevenness were found in the tile joints after demolding. Further, outdoor exposure was carried out, and the adhesion strength between the tile and the mortar was measured on the 14th day in the same manner as in Example 3. The result was 25 kgf / cm ² , which was almost the same as the bond strength between the mortar and the concrete in Example 3.

Example 5 The same procedure as in Example 4 was repeated, except that 3% by weight of iron oxide black pigment was added to the high-fluidity mortar of Example 2 in an amount of 3%.
It was poured to have a thickness of m. Black and gray joints were formed on the tile joints after demolding, and no defects such as pinholes or color unevenness were observed.

From the results of Examples 3 to 5 described above, the PC board tiles produced by the method of Examples did not cause cracks in the high-fluidity mortar layer, and the tile, the high-fluidity mortar cured product, and It is clear that the adhesive strength between the layers of the high-fluidity mortar cured product and the concrete is sufficiently high, the surface condition of the tile joint is good, and no pinholes or color unevenness is observed.

[0027]

As described in detail above, the method of pre-applying a PC board tile using the high-fluidity mortar of the present invention is based on Portland cement and 3CaO.3Al ₂ O ₃ between the tile and the concrete PC board. A clinker powder containing 50% by weight or more of a calcium aluminate compound represented by CaSO ₄ or 12CaO · 7Al ₂ O ₃ in a plain or total amount, and a gypsum powder, and the mixing ratio of each of the above components is Since high-fluidity mortar having 10 to 50 parts by weight of clinker powder and 5 to 50 parts by weight of gypsum powder is used with respect to 100 parts by weight of Portland cement, tile and mortar hardened product and mortar hardened product and concrete are used. Not only is it easy to manufacture PC board tiles that have strong adhesion between the layers of the PC board and the risk of tile peeling, Appearance yl joint is good, and since defects such as pinholes and uneven color is very small, it is possible to significantly reduce the reworking of joints.
If a colorant, a water-reducing agent, a thickener, a defoaming agent, a reaction control agent, an admixture, and / or an aggregate is added to this high-fluidity mortar, it will be a high-fluidity mortar suitable for the actual conditions of construction. Moreover, the PC board tile suitable for the intended purpose can be manufactured. In particular, if a colorant is added to this, a color joint can be formed without any extra trouble regardless of the post-treatment, and therefore, the P with color joint can be formed.
C plate tiles can be manufactured at a significantly lower cost than before.

Continuation of front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display area C04B 22:14) A

Claims (2)

[Claims] 1. A tile having a rear surface facing upward is spread in a formwork, a high-fluidity mortar is poured on the rear surface of the tile, and concrete, reinforced concrete or lightweight concrete is placed on the tile, followed by curing and demolding. In the prefabricated method of molding a PC board tile, the high-fluidity mortar contains Portland cement and 3CaO / 3Al ₂
A clinker powder containing a calcium aluminate compound represented by O ₃ · CaSO ₄ or 12CaO · 7Al ₂ O ₃ in an amount of 50% by weight or more in a single amount or a total amount, and gypsum powder, and each of the above The mixing ratio of the ingredients is
A PC board tile prefabricating method using a high-fluidity mortar, characterized in that clinker powder is 10 to 50 parts by weight and gypsum powder is 5 to 50 parts by weight with respect to 100 parts by weight of Portland cement. 2. A PC board tile prefabricating method using the high-fluidity mortar according to claim 1, wherein the high-fluidity mortar comprises a colorant, a water-reducing agent, a thickener, in addition to the components.
A method for pre-applying a PC board tile using a high-fluidity mortar, which comprises a defoaming agent, a reaction control agent, an admixture, and / or an aggregate.