JPH0412042A - Artificial granite and production thereof - Google Patents

Abstract

PURPOSE:To obtain artificial granite having gloss, naturality, hardness and compressive strength close to those of natural granite at a low cost by blending a slag-based hydraulic hardener composed of a specific metallic oxide with three or more kinds of crushed stone granite pieces having different grain diameters. CONSTITUTION:Artificial granite is obtained by blending 1 pt.wt. slag-based hydraulic hardener composed of CaO, SiO2, Al2O3, MgO, Fe2O3, etc., as a main chemical composition and 2-3 pts.wt. crushed stone granite pieces selected from at least three or more kinds having 25-30% with about 1.2mm median of the grain diameter component, 25-30% having about 2.5mm median, 20-30% with about 5mm median and 25-50% having about 10mm median thereof. The aforementioned artificial granite is obtained by, e.g. arranging two partition plates 6 and 6 at positions of left and right symmetry with the center line as a boundary in a molding box, dividing the molding box into 3 layers, injecting ready mixed concrete constructing the product surface in the central layer 10 and ready mixed concrete forming the back surface layer in the residual layers 9 and 11, taking out the partition plates 6 and 6, then drying and forming the concrete, cutting the formed concrete with a diamond cutter 15 at nearly the center of the surface layer (A) and polishing the cut faces with a finishing grindstone.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a method for manufacturing artificial granite.

More specifically, the present invention relates to an artificial granite that is close to natural and made from crushed natural granite and a hydraulic super hardening agent, and a method for producing the same.

[Prior Art] Many types of panels have been proposed and used for housing exterior wall materials, interior wall materials, floor materials, etc., depending on the material, such as stone, cement I type, and wood. Among these, granite is used for various purposes such as flooring, wall materials, and tombstones. After this granite is cut into the desired shape at a stone processing plant or quarry, the remaining waste granite is disposed of in a landfill because it is too small to be of any use. Conventionally, methods have been proposed for manufacturing artificial stones using such waste materials of natural stones.

For example, Japanese Patent Application Laid-Open No. 57-39906 describes a method for manufacturing artificial stone in which 2.4 kg of white cement and 2.30 kg of water are used.
In contrast, the aggregate weight of crushed natural stone is 6.00 K, g.
A method has been proposed for making artificial stone by mixing 0.08 kg of soap water, 0.2 kg of cement adhesion enhancer, and 0.08 kg of stone sesame oil as mixing materials. However, these conventional artificial stones are inferior to natural stones in terms of naturalness, that is, appearance similar to natural stones, and glossiness.

[Problems to be Solved by the Invention] The purpose of the invention is to provide an artificial granite that uses waste stone chips and has gloss, naturalness, hardness and compressive strength similar to natural granite, and a method for manufacturing the same. It's about doing.

[Means and effects for the invention to solve the problem] Hitoyu J [1 stone - Main chemical composition is Cab, 5i02, A1203+ M
When 1 part by weight of a slag-based hydraulic curing agent consisting of gO, Fe2O3, etc. is used, the median particle size component of crushed granite is approximately 1. ．．
2mm is 25% to 30%, and the median is about 2.5mm.
2 to 3 parts by weight of crushed granite pieces selected from at least three types from 5% to 30%, 20% to 30% with a median value of about 5 mm, and 25% to 50% with a median value of about 10 mm. It is an artificial granite made of.

The hydraulic curing agent may be one that has high compressive strength and can harden the granite pieces with high strength. Preferably, a slag-based pre-mortar with high strength and high durability is used. The hydraulic curing agent preferably has low viscosity and is capable of producing a dense hydrated composition due to the hydration properties of blast furnace slag. Specifically, for example, artificial granite is required to have weather resistance, chemical resistance such as acid and alkali resistance, and abrasion resistance due to the use of artificial granite, such as flooring materials.

Furthermore, due to the nature of artificial granite, the surface is required to be natural and glossy. In particular, in order to improve gloss, a hydraulic curing agent having approximately the same hardness as the crushed granite with which it is mixed is required. The reason for this is that when the surface of artificial granite is polished with a Diamond I-grindstone, the hardness of the surface is different and the surface roughness is uneven, resulting in uneven light reflection and poor gloss. Furthermore, when flooring materials are used, uneven wear occurs between the crushed stone part and the hydraulic curing agent part.

In this invention, a material having the following characteristics was used.

■Develops high strength by curing at room temperature, 700-1.100k
g f / cm 2 degree compressive strength, 90 k
g f/' crn Two types of bending strength can be obtained. ■Produces a cured product with low water permeability and excellent freeze-thaw resistance. ■Excellent wear resistance and high resistance to cavitation. ■It has excellent durability against seawater and chemicals, shows no signs of carbonation, and exhibits stable properties over a long period of time.

In this invention, crushed stone granite having the following characteristics was used. Crushed granite is made from tombstone waste that cannot be used for products.
Any kind of waste material, such as construction waste or stone quarry waste, can be used. Therefore, the crushed granite mentioned here refers to granite that has been crushed naturally or that has been artificially crushed using a stone crushing machine. As described above, in the present invention, crushed granite is used by selecting and mixing three or more types of particle size components from the three particle size ranges described above. This is to make it look natural. Normally, natural granite is known to come in a variety of patterns, but due to the nature of its crystals, it exhibits patterns such as white and black. The size of this pattern appears to be a constant size to the human eye.

In the case of artificial granite, the size of the pattern is made to look the same, in other words, an optical illusion is used. For this reason, crushed granite does not look like natural stone even if it has a large grain size or a small grain size. The inventors selected the above particle size based on these considerations. Furthermore, a coloring agent is mixed with the hydraulic curing agent to give it a color similar to that of natural stone.

Method of manufacturing artificial granite Two partition plates, which can adjust the size of the formwork as needed, are placed at the center of the formwork, dividing the formwork into three layers.
Fresh concrete constituting the surface layer constituting the surface of the product is poured into the intermediate layer divided into three layers, and then the remaining two
Fresh concrete constituting the back layer of the product is poured into the layer, and after the partition plate is pulled out, the surface layer and the back layer are dry-molded, and this dry-molded product is further poured into a layer approximately at the center of the surface layer. This method of manufacturing artificial granite is characterized in that the artificial granite is produced by cutting it into sections and finishing polishing the cut surface layer with a finishing whetstone.

It is preferable to use a diamond cutter for the cutting because the cutting can be done efficiently.

[Example 1] Hydraulic curing agent: Mixed water: Granite: Mixing ratio of granite particle size, 5 mm 50% 2.5 mm
25%1. 2mm
25%, and cement (NEM-FW) manufactured by Nippon Steel Cement Co., Ltd. was used as the hydraulic hardening agent. The main components of this cement 1~ are 5i02 (26.8%)-A6
00 k, g 111! 00Kg 1□ 03 (92%), Fe2 o3 (03y,
.

), CaO (54,5 layer%)-MgO (3,4%)
, SO2 (: 3.6%), specific gravity: 3.02.Furthermore, 10% of the above water was mixed with a light stabilizer [trade name: Fine Ceram (manufactured by Ogiro Co., Ltd.)]. The mixing ratio of the hydraulic curing agent and granite is 1.3. Furthermore, the water-cement ratio W, 7'C is 18.5%.

To make artificial granite, knead the above-mentioned granite and hydraulic hardening agent in an omni mixer for about 2 minutes, so that the hydraulic hardening agent and crushed granite of each particle size are uniformly mixed. After that, add the light stabilizer and water, and add 4 more times.
Mix for a minute.

The mixed crushed granite and hydraulic curing agent are uniformly poured into a mold, and a vibrator is applied to improve fluidity and leveling is performed. After pouring, the mold is removed the next day. The demolded product is cured in water for 14 days.

The compressive strength when cured in water for 7 days is 586, and the compressive strength when cured for 14 days is gf/cm2.691.
Kgf/cm2, and generally the longer the curing period, the greater the compressive strength.

[Example 2] Hydraulic curing agent: 800 Kg blended water 129! Granite:
1. Particle size mixing ratio of bOOkg granite: 1.2mm 25% 2.5mm
25%5 m 1

2 5 9010 mm
As the 25% hydraulic curing agent, a cement (NEM-F) manufactured by Nippon Steel Cemen Co., Ltd. (trade name) was used. The main components of this cement are CaO (54.5%), S ], 0
2 (25,1%>, Al103 (9,3%), M
go (3,9%), Fe203 (1,6%), specific gravity:
It is 3.02. The antifoaming agent is trade name: Onoda Nikofix #100. A specific gravity of 0.99 is used, and 0.1% of the hydraulic curing agent is mixed.

First, the above-mentioned granite is kneaded with a hydraulic hardening agent using an omnimixer for 2 minutes so that the hydraulic hardening agent and the crushed granite of each particle size are uniformly mixed. Then, add the above antifoaming agent and water and mix thoroughly for 4 minutes.

Pour the unmixed granite into the formwork evenly and level it with a hyft toter to improve fluidity. After casting, take it out of the curing room and demold it. The demolded product is 14
Day IH1 underwater curing 4-ru. In addition, the compressive strength of the product differs depending on the curing period, and when the curing period is 7 days, 1 and 4 days, it is 848 (kg f /
c: m2) -921(K, Z f /' c
m2).

[Example 31 Hydraulic curing agent/80 (kg) water:
Groundwater 12 (N control shadow stone:
], 60 (,) Kg granite particle size mixing ratio 1.2 mm 25% 5 mm
25% 2.5mm
25%10mm
25%, and pre-mortar (NEM-W) manufactured by Nippon Steel Cemen I-Co., Ltd. was used as the hydraulic curing agent. This pre-mortar (NEM-W) was prepared in Example 1.
The cement (NEM-FW) is made of 50 parts by weight of cement and 50 parts by weight of blast furnace slag fine aggregate of 0.6 m/'m or less, and has a specific gravity of 2.87. The antifoaming agent is #100, a product of Onoda Niko Fix Co., Ltd.
The amount to be added is C (amount of hydraulic curing agent, the same applies below)
1% of XO was added.

Pigment: The amount added consists of 5% CX (blue).

In this case, the mixing ratio of the hydraulic curing agent and granite is 1.
=2. Note that the crosstalk is the same as in the first embodiment.

[Example 4] Hydraulic curing agent: Blended water: Groundwater Granite: Mixing ratio of control granite particle size: 1.2 mm or more 25% 00 kg 00 kg 2.5 mm or more 25% 50 mm or more
The product name of the 50?6 antifoaming agent is Onoda Nikofi Inc. #100, and the amount added is CX01.
%.

In this case, the same hydraulic curing agent as in Example 3 was used. Further, the kneading process is the same as in Example 1. The application of this embodiment is suitable for local boundary blocks and joint slabs.

[Example 5] Hydraulic curing agent: 800Kg mixed water, groundwater 129! Granite: 1. ,600.
Kg Granite particle size mixing ratio: 1.2mm 25% 2.5mm
25% 10mm
50% However, the same hydraulic curing agent as in Example 3 was used. The antifoaming agent is the same as in Example 2.

The amount of pigment added is CX 5% (yellow).

In this case, the mixing ratio of the hydraulic curing agent and granite is 1
-2. Note that the kneading process is the same as in Example 1.

"Comparative example" Hydraulic curing agent: Rated water.

Granite: Grain size mixing ratio of granite: 2.5 mm or more 50% 20 mm or less 509 However, the hydraulic curing agent is pre-mortar (NEM-
D> was used.

The main components of the cement of this mortar (NEM-D>) are SiC2 (25.4%), A1203 (98%), F
e2O3 (1.6%), Ca0 (531%), MgO
(4.3%>-SO2 (4.0%). Pre-mortar (NEMD) is based on 66 parts by weight of this cement.
It consists of 34 parts by weight of blast furnace slag-based fine aggregate of 1°2 m/m or less. This specific gravity is 2.94. Antifoaming agent 80
0 K g 12 ≦9! 600 Kg is a product manufactured by Onoda Nikofi-Incs Co., Ltd., and 0.1% of #100 CX was added.

In this case, the mixing ratio of the hydraulic curing agent and granite is 1=
It's 2nd. Furthermore, the kneading process is the same as in Example].

[Test Results] The test results for the glossiness, naturalness, hardness, and strength of artificial granite and natural granite in this invention for each of the above-mentioned implementation percentages 11 to 5 are shown in a table.

○: Very good, △: Fairly good, ×: Bad However, this compressive strength is for a product that was cured in water for 7 days.

With my friend Next, a method for manufacturing the artificial granite will be described.

Figure 1(a) is a sectional view of a mold for manufacturing artificial granite. The formwork 1 is provided with two or three legs at its lower end. Its legs 2 support a flat plate 3. An L-shaped steel plate 4 is attached on top of the flat plate 3 so that the thickness of the artificial granite can be changed. Bolts 5 for fixing the L-shaped steel plate 4 and the flat plate 3 are attached to the lower part of the L-shaped steel plate 4. By removing this port I~5, L
The spacing between the letter-shaped steel plates 4 can be freely adjusted.

Inside the L-shaped steel plate 4, a second stainless steel plate 6 for partitioning is provided at a position symmetrical with respect to the center line between the L-shaped steel plates 4 on both sides. A handle 7.8 for hanging is formed on the upper part of the partition stainless steel plate 6. In this embodiment, the interval between the 1-shaped steel plates 4 is divided into three by the partitioning stainless steel plates 6. Dividing groove 9,1
], normal ready-mixed concrete is poured uniformly into the dividing groove 10, and ready-mixed concrete mixed with the crushed granite of the above embodiment is uniformly poured into the dividing groove 10.

In the case of this embodiment, the distance between the partitioning stainless steel plates 6 is adjusted so that the distance between them is an appropriate thickness when the artificial granite is completed. Ready-mixed concrete A with crushed granite in dividing groove 10
, dividing groove 9, 1] with ready-mixed concrete B, which will become the back side of the artificial granite,
Finish injecting C.

Next, pull the hook handle 7.8 provided on the top of the partition stainless steel plate 6, and
Pull out from formwork 1. In this state, it is cured in water as described above. After the fresh concrete has dried, the poles 1 to 5 are loosened and the L-shaped steel plate 4 is cut off from the flat plate 3.

Furthermore, the center portion of the crushed granite A portion of the finished product is cut using a diamond cutter 15 (FIG. 3). Further, after cutting, the surface of the crushed granite portion A is polished with a diamond grindstone. This polishing creates an artificial granite surface with a luster and luster that is closer to natural.

In this embodiment, two products can be produced from one product at the same time, so a large number of artificial granites can be produced efficiently.

Second Embodiment FIG. 5 shows the second embodiment of the formwork 20 for manufacturing artificial granite.
It is a sectional view of the formwork of an example. The formwork 20 has a flat plate 21 at its lower end. The lower surface of this flat plate 2 is supported by three legs 23. On both sides of the flat plate 21,
A steel plate 22 that can be opened and closed is attached to the flat plate 21 via a hinge 24. The formwork 20 is arranged in multiple layers in the following order: steel plates 22, partitioning stainless steel plates 25 for separating product layers, and partition plates 26 for partitioning one lot of products. First, the stainless steel partitions 25 and the partition plates 26 are arranged in accordance with the size of the artificial granite as in the first embodiment. After pouring fresh concrete, the stainless steel partition plate 25 is pulled out. The rest is the same as in Example 1. However, in this embodiment, after the injected material has dried, the steel plates 22 on both sides are opened to both sites by hinges 24, and the steel plates 22 on both sides are opened in sequence from both sides. f4
Let's take out the creation and go. By doing this, the manufacturing time of the product can be shortened and a large quantity of products can be produced. In addition, the partition stainless steel plate 25
may be pulled out at the same time as ready-mixed concrete is put in.

[Effects of the Invention] As detailed above, this invention mixes waste stone pieces of natural granite with different particle sizes and a hydraulic curing agent to improve the luster, naturalness, hardness and compression of natural granite. We were able to manufacture artificial granite with almost the same strength. This granite is
It has the following effects.

a. Since the waste material of natural granite is used, the material can be obtained at low cost and in large quantities, making it possible to manufacture artificial granite with a low cost of 1.

b. Also, since the growing period is shorter than that of natural granite, a large amount of artificial granite can be produced in a short period of time (7 days at most, 14 days at most).

Since it is C4 artificial granite, it can be easily processed into products.

d. Artificial granite of a size corresponding to a desired shape can be manufactured in large quantities in a short time using a formwork with a simple structure that takes advantage of symmetry.

[Brief explanation of the drawing]

Figure 1 is a sectional view of the formwork, Figure 2 is a plan view showing the top of the formwork, Figure 3 is a view of cutting the artificial granite from the center,
FIG. 4 is a diagram showing artificial granite, and FIG. 5 is a sectional view of a formwork showing another embodiment.

Claims (1)

[Claims] 1. Main chemical composition is CaO, SiO_2, Al_2O_
3. 1 part by weight of a slag-based hydraulic curing agent consisting of MgO, Fe_2O_3, etc., the median value of the particle size component of crushed granite is about 1.2 mm, and the median value is about 2.5%.
mm from 25% to 30%, and the median value is about 5mm from 20% to
30% and 2 to 3 pieces of crushed granite selected from at least three types with a median value of about 10 mm and 25% to 50%.
Artificial granite consisting of heavy parts. 2. Place two bulkhead plates in the center of the formwork that can adjust the size of the formwork as necessary to divide the formwork into three layers. Inject the ready-mixed concrete constituting the surface layer of the product, and then pour the ready-mixed concrete constituting the back layer of the product into the remaining two layers. After pulling out the partition plate, the surface layer and the back layer A method for producing artificial granite, which comprises: dry-shaping, cutting the dry-shaping at approximately the center of the surface layer, and polishing the cut surface layer using a finishing grindstone.