JPH01122981A - Colored concrete blocks - Google Patents

Abstract

PURPOSE:To prevent glass coating films from cracking by making the heat expansion coefficients of the refractory aggregate and the glass almost equal in a colored concrete block in which glass coating films are formed on the surfaces of the concrete block containing refractory aggregate and heat-resistant pigments. CONSTITUTION:A colored concrete is formed by dispersing heat-resistant pigments in a concrete block material containing refractory aggregate. The colored concrete block is flame-sprayed with clear or translucent coating glass films. At this time, the aggregate and/or the glass are selected so that their heat-expansion coefficients become almost equal.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to colored construction materials such as colored concrete blocks having a transparent or translucent glass coating formed on the surface of the colored concrete blocks.

(Prior Art) For concrete buildings, there are many construction methods in which individual concrete blocks are molded in a factory, and then transported to a construction site and assembled.

On the other hand, it is also known to thermally spray glass onto the surface of a concrete block in order to decorate the outer surface of the concrete block to prevent surface deterioration and improve durability.

Furthermore, in recent years, colored concrete blocks have been used to improve the appearance of concrete buildings.

Conventionally, the following techniques are known for decorating the surface of cement products such as concrete blocks.

■Apply paint to the surface of cement products by brushing, spraying, etc.

■Apply glaze to the surface of the molded cement product, place it in a mold, and fire it at a temperature higher than the melting temperature of the glaze (
(See Japanese Patent Application Laid-Open No. 61-58875).

■Glaze is applied by thermal spraying. For example, a colored glaze may be applied directly to the surface of a cement product by thermal spraying (see JP-A-61-71964), or a protective coating of glass may be formed on the surface of a cement product by thermal spraying (JP-A-60-23).
(See No. 5775).

(While the invention is trying to solve 2.α) However, the above conventional technology has the following problems.

- Paints that are applied by brush, spray, etc. have problems with durability and weather resistance, such as fading of the paint or peeling off after a long period of time, which impairs the appearance.

■For products that are fired at a temperature higher than the melting temperature of the glaze, a large amount of thermal energy is required for firing, temperature control is difficult, and the size of the cement product to be fired is limited by the size of the kiln used. There were problems such as the inability to glaze large cement products.

■ Conventional glazing technology using thermal spraying has the following problems.

Even if a colored glaze is applied directly by thermal spraying, the temperature is extremely high during thermal spraying, causing the colored glaze to thermally decompose and change color, resulting in an uneven colored state and an aesthetically unsatisfactory result.

Furthermore, in the case where a glass protective film is formed by thermal spraying on a colored surface, the durability and strength of the cement product decreases due to the thermal spraying heat, and the product cannot be said to be satisfactory.

Furthermore, due to the difference in thermal expansion between glass and concrete materials, especially aggregate, tortoise-shell-shaped cracks occur on the glass-covered surface.
The appearance was spoiled.

(Means for solving the problem α) Therefore, as a result of intensive research, the present inventors have developed a colored building material that solves all the problems of the prior art described above.

The concrete block according to the present invention is constructed by combining a thin colored concrete block with a thick non-colored concrete block, thereby reducing the amount of expensive colored concrete blocks and producing low-cost non-colored concrete. Increase the amount of blocks,
As a result, overall cost can be reduced.

For colored construction materials, a colored concrete block is formed in advance using a concrete block material to which heat-resistant pigments have been added and mixed, and a transparent or translucent glass coating is applied by thermal spraying to take advantage of the coloring of the colored concrete block material. It is formed on the surface thereof.

This colored construction material has excellent weather resistance and durability because it is coated with glass. Furthermore, since the glaze is applied with a burner or the like instead of being fired in a kiln, the cost is low because no thermal energy is used, and it is suitable for decoration of large products. Furthermore, the colored state can be uniform and beautiful.

By the way, when various aggregates were selected to be added to this colored building material and the material was prepared, a number of hexagonal cracks occurred in the glass coating as described above. The reason for this is thought to be that the difference in thermal expansion coefficient between the aggregate and the glass occurs when the aggregate and glass, which have expanded due to thermal spraying heat, are cooled and contracted.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a colored building material in which a transparent or translucent glass-like coating is formed by thermal spraying on a colored concrete block material, which suppresses the occurrence of hexagonal cracks. be.

(Means for Solving the Problems) The feature of the present invention is to make the coefficient of thermal expansion of the coated glass substantially the same as the coefficient of thermal expansion of the aggregate mixed in the concrete block material. This is because it prevents cracks from forming due to heat tension.

That is, the colored building materials according to the present invention either have the same coefficient of thermal expansion or have a slight difference in the coefficient of thermal expansion (o, 5xi
The fire-resistant aggregate and the glass of the glass coating are selected, and the aggregate is added to the concrete block material to form a colored concrete block, and the surface of the colored concrete block is coated with a transparent or semi-transparent material by thermal spraying. A glass coating made of the transparent glass is formed.

Here, the [concrete block material] is selected from cement, calcium silicate, silica, gypsum, carbon, slag, lime, magnesia, alumina, iron oxide, aluminosilicate, perlite, shirasu, viscosity, glass, asbestos, etc. The main raw materials are synthetic products or natural products of 1a or 2a or more. Various metal materials, fibers, etc. may be added.

``Refractory aggregates are required to withstand the heat of thermal spraying.

As such an aggregate, for example, alumina (thermal expansion coefficient g
1 s x i o-”), o') hin (12X 1
0-”) etc.

[Heat-resistant pigment J is, for example, Zr-8iPr type, Ti-
8b-Cr system, Zr-V system, Ti-Cr-W system, Ti
5l)-Cr Fe system, Fe-8b-Cr-8i system, Fe-Cr-Zn system, Fe-Cr-Zn-3i system, F
e-Cr-Zn-Mn system, Al-Mn system, 5n-Cr system, 5n-Cr-Co system, Co-Zn-3i system, Co-8l1%, Co-AfCr
system, Zr-8i-V system, Cr-Al system, Cr-Co-A
I-Zn series, Fe-Cr series, Cr-Fe-Co M
It is a 7-lithium or sintered I#, m material containing transition element oxides such as n-type, F e -A I-type, and silicates.

The blending ratio of heat-resistant pigments to concrete block materials varies depending on class M, physical properties, degree of coloring, etc.
The amount is preferably 0.5 to 5 parts by weight, more preferably 1 to 3 parts by weight, based on 100 parts by weight of the inorganic material.

The reason for this is that if the blending ratio is less than 0.5 parts by weight, no coloring effect can be expected, and if it exceeds 5 parts by weight, the strength of the molded product will decrease.

Heat-resistant pigments being dispersed and molded into concrete block materials means that coloring agents are added to the concrete block materials at the mixing stage.

The molded “colored concrete block material” can be used, for example, as a cement concrete board, cement mortar board, or ALC.
Typical examples include a board, a gypsum board, an asbestos slate board, a calcium silicate board, or blocks thereof, and the shape thereof is not limited.

It is desirable to dry this colored concrete block material by natural drying, thermal spraying preheating, etc. before forming a glass coating by thermal spraying.

The reason for this is that if there is moisture near the surface of the colored concrete block material, it will evaporate during thermal spraying, causing cracks in the coating and impairing its aesthetic appearance.

Thermal spray glazing forms a transparent or semi-transparent glass coating, and includes lead-containing borates and lead-free borates.
Lifts are often used.

There are various coefficients of thermal expansion depending on the type of glass.
This glass and the refractory aggregate should have the same coefficient of thermal expansion or a slight difference (up to 0.5XIC) in order to form a crack-free glass coating. be.

(Example) Examples of the present invention are listed below.

Example 1 White cement (manufactured by Onoda Cement Co., Ltd.) as an inorganic material
100 parts of alumina as a refractory aggregate, TiSt as a heat-resistant pigment) -Cr-based yellow ceramic pigment (
8 Pottery Sangyo G-455) and 35 parts of water are mixed together, and this mixture is charged into a formwork to form a colored concrete block (
300+omX300 +o+aX 30 +n+a)
It was created.

After air drying this block, spraying distance 35
0non, scanning speed 3, under conditions of 6 liters, propane,
When 7 liters of borosilicate was flame sprayed using oxygen and air, a beautiful yellow decorative board with a glass coating of approximately 100 μm was obtained.

In this case, the coefficient of thermal expansion of the refractory aggregate is 8.0xio-'
On the other hand, the thermal expansion coefficient of the 7 liters of borosilicate used here is 7.6 x 10-6, and the difference is 0.4 x 10
-6. According to this example, cracks were sufficiently prevented even if the difference in thermal expansion coefficient was 0.4×10−′.

Comparative Example A colored concrete block was prepared in the same manner as in Example 1, except that chamotte (coefficient of thermal expansion: 6.8 x 101) was used as the aggregate.

When this block was thermally sprayed with 7 liters of borosilicate in the same manner as in Example 1, cracks occurred.

Therefore, if the difference in thermal expansion coefficients becomes about 0.8×10 −6 , cracks will inevitably occur.

From the above, the preferable difference in thermal expansion coefficients is o, 5xi
It can be said that it is up to about o-@.

(Effects of the Invention) According to the present invention, since the difference in the coefficient of thermal expansion of the aggregate in the concrete block material and the coefficient of thermal expansion of the glass used for glazing is small, it is possible to suppress hexagonal cracks that occur in the glass coating.

Further, according to the present invention, since a glass film is formed, it has excellent weather resistance and durability.

Also, since the glaze is applied with a burner, etc., instead of being fired in a window and glazed,
It uses no heat energy, is low cost, and can be used as makeup for large products.

Furthermore, since the molded concrete block material itself is colored, the colored state can be uniform and beautiful.

Claims (1)

[Claims] A colored concrete block is formed by adding dispersed heat-resistant pigments to a concrete block material to which fire-resistant aggregate has been added, and a transparent or translucent glass coating is formed on the surface of the colored concrete block by thermal spraying. A colored concrete block comprising: a fire-resistant aggregate and/or glass selected such that the fire-resistant aggregate and the glass have substantially the same coefficient of thermal expansion.