JPH04169639A - Alc composite panel - Google Patents

Abstract

PURPOSE:To prevent generation of surface break and the like at curing and obtain excellent performance of insulating effect of heat and sound with light weight by covering one or more face of an ALC plate with fiber reinforced concrete layer having a specified value of drying contraction coefficient. CONSTITUTION:One or more face of an ALC plate is covered with a fiber reinforced concrete layer 2 which is laminated on the face and formed in one body with it. The drying shrinkage factor of the fiber reinforced concrete layer 2 is specified 0.08% or less. Hereby, at placing and curing of the fiber reinforced concrete layer 2, surface break or crack due to drying shrinkage is not generated, and warping or breakage of the panel itself can be eliminated.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention is an ALC plate that has a low drying shrinkage rate and is integrated with a laminated fiber-reinforced concrete layer that has a good μm1 stain, as a surface reinforcing layer of an ALC plate. Regarding the provision of composite panels.

[Prior art] Precast concrete plates are used at some sites for the purpose of simplifying the on-site construction process and standardizing quality for many of the external walls or partition walls used in flexible steel structures. ing.

Precast concrete plates have the advantage of being manufactured in a factory, so quality control is reliable, and there is no need to wait for curing when on-site construction, and furthermore, on-site construction is easy.

However, since this type of precast concrete plate is usually 150m+n or more thick, it requires many people and heavy machinery to transport and install it, and there are other disadvantages such as the weight of the structure itself becoming heavy. Ta. or,
This type of precast concrete board has not been fully satisfactory in terms of functions such as heat insulation and sound insulation. Furthermore, this type of precast concrete plate is difficult to perform processing such as cutting on-site, and it is necessary to prepare a separate molded concrete plate with a size and shape suitable for each site.

From this point of view, lightweight inorganic boards such as lightweight concrete boards with excellent fire resistance and heat resistance are used as exterior wall materials or partition materials.

This type of lightweight board is generally suitable for on-site treatment such as cutting with electric saws and nailing, and has the advantage of being lightweight and easy to handle, so it can be assembled without using heavy machinery such as special cranes. It also has the advantage of having good heat insulation and no condensation, as well as the ability to form external walls or partition walls with excellent sound insulation.

However, this type of lightweight board is generally a foamed structure or a structure with foamed lightweight aggregate such as perlite or fuyolite, so it does not have sufficient compressive strength or bending strength, and is particularly weak against impact. However, there were disadvantages such as the possibility of breakage or internal defects.

In particular, when natural stones such as marble or tiles are pasted onto this type of lightweight board, sufficient holding power cannot be expected for these natural stones or tiles, and the pasted natural stones are attached to the inside of the lightweight board! There were some inconveniences such as falling.

In addition, this type of lightweight board has a rough surface due to its foamed structure or foamed lightweight aggregate, making it difficult to adhere decorative steel sheets or the like or spraying decorative paint on the surface, and it is also difficult in terms of water resistance.

From this point of view, an attempt was made to provide a panel material with a surface reinforcement layer with good impact resistance by using a lightweight material such as an ALC board as a core material and spraying mortar containing alkali-resistant glass fiber on the surface of this core material. It is being

In addition, a mortar layer containing alkali-resistant glass fibers is provided on both sides of a relatively thick board such as an ALC board, and the board is sandwiched between this alkali-resistant glass fiber reinforced concrete (hereinafter referred to as GRC) layer. However, attempts are being made to provide so-called GRC sandwich panels.

Furthermore, attempts have been made to provide a lightweight panel material with a reinforced surface by bonding a GRC board to a relatively thick board material such as an ALC board.

[Problems to be Solved by the Invention] However, in this type of lightweight panel material, a lightweight material such as an ALC board constituting this panel material, and a GRC layer formed on the core material or the surface of the board material made of this lightweight material. The layers are
Since the shrinkage behavior is significantly different, there is an inconvenience that the bonding surface between the core material or plate material made of a lightweight material and the GRC layer that is integrally laminated thereon causes a phenomenon of surface breakage over time.

Furthermore, if a surface break occurs at the joint surface between the core material or plate material made of lightweight material and the GRC layer that is laminated integrally with this, rainwater etc. will infiltrate from this surface cut edge, and the infiltrated rainwater will There were inconveniences such as freezing and the formation of the GRC layer from the cut edge of the surface.

In addition, in the method of obtaining a panel material by gluing a GRC board to a plate material such as an ALC board that has been formed, a board material such as an ALC board and a GR
The GRC board may sag due to insufficient integrity with the C board, deterioration of the adhesive over time, or abrasion of the joint surface due to thermal changes in the adhesive image material. It was not possible to attach heavy objects such as natural stone to the boards.

The ALC composite panel according to the present invention has been developed in view of the above-mentioned disadvantages in conventional panel materials, and the ALC composite panel has surface cracks due to drying shrinkage between the ALC board and the fiber-reinforced concrete layer that is laminated integrally with the ALC board. The purpose of this project is to provide an ALC composite panel that does not cause any damage and allows for the attachment of natural stone materials, etc.

[Means for Solving the Problems] To achieve the above object, the present invention provides a method in which at least one surface of the ALC board 1 is covered with a fiber-reinforced concrete layer 2 that is laminated integrally with the chain portion. Furthermore, the ALC composite panel is constructed as a fiber-reinforced concrete layer in which the drying shrinkage rate of this 1aia reinforced concrete layer 2 is 0.08% or less.

[Function] In the ALC composite panel according to the present invention, the drying shrinkage rate of the fiber-reinforced concrete layer 2, which is laminated integrally with the ALC board 1, is 0.08% or less. It functions in such a way that it does not cause surface breakage at the joint surface with the ALC board 1 due to drying shrinkage over time.

[Embodiments] Hereinafter, typical embodiments of the present invention will be described with reference to the accompanying drawings.

In the embodiment shown in FIG. 1, a fiber-reinforced concrete layer 2, which will be explained later, is laminated on the surface of an ALC board 1, and the ALC obtained as a body is
This is a composite panel, and a fluorine paint or the like is directly applied to the surface of this fiber-reinforced concrete layer 2 to create a decorative surface before use.

The thickness of the fiber-reinforced concrete layer 2 laminated on the ALC board 1 is preferably about 10 to 40 mm depending on the purpose of the ALC composite panel to be formed, and the shape of the composite panel itself to be formed and the ALC board It is preferable to design the panel so that the desired thickness is obtained depending on the thickness of the fiber reinforced concrete layer 2 and the laminated area of the fiber reinforced concrete layer 2 relative to the surface of the ALC board 1.

In the embodiment shown in FIG. 2, a decorative material 3 such as tile, stone, or metal plate is applied to the surface of a fiber-reinforced concrete layer 2 formed on the surface of an ALC board 1. It is an ALC composite panel fixed together by 2, and is used as a decorative exterior wall material etc. based on the ALC board 1.

In the embodiment shown in FIG. 3, dovetail grooves 4 in the form of side molds are arranged side by side on the surface of the ALC board 1 and extend toward the inner depth, and a part 2a of the fiber-reinforced concrete layer 2 is placed in the dovetail grooves 4. The fiber-reinforced concrete layer 2 is formed in such a manner that it is poured into the fiber-reinforced concrete layer 2, and the decorative material 3 is pasted onto the fiber-reinforced concrete layer 2 at the time of forming the fiber-reinforced concrete layer 2 to be used as a stronger decorative exterior wall material. It has a structure that goes through the following.

In the embodiment shown in FIG. 4, a through hole 5 whose diameter is reduced toward one side is provided in the ALC board 1, and a fiber-reinforced concrete layer 2 is provided on the narrowing side of the through hole 5. A part 2b of this fiber-reinforced concrete layer 2 is driven into the through hole 5, and is integrated with the fiber-reinforced concrete layer 2 to form a strong framework inside the ALC board 1. Further, a decorative material 3 is pasted onto the surface of this fiber reinforced concrete layer 2 at the same time as the formation of the fiber reinforced concrete layer 2 to form an ALC composite panel that can also be used as a decorative exterior wall structure.

In the embodiment shown in FIG. 5, a hook-shaped metal fitting 6 is attached to the ALC board 1 in advance, and a fiber-reinforced concrete layer 2 is cast and formed on the side of the hook 6a. A mechanical reinforcing means using the hook 6a is provided between the laminated fiber-reinforced concrete layer 2 to reliably prevent the laminated fiber-reinforced concrete layer 2 from peeling off.
This is a composite panel C.

The embodiment shown in FIG. 6 utilizes the metal fitting 6 of the embodiment shown in FIG.
was attached to the surface of the ALC board 1 using the hook 6a of the metal fitting 6, and a fiber-reinforced concrete layer 2 was cast on the surface of the ALC board 1 so as to cover the mesh material 7, and reinforced with the mesh material). It is an ALC composite panel, and has a structure that can almost completely prevent the fiber-reinforced concrete layer 2 cast on the surface of the ALC board 1 from peeling off.

Next, the fiber-reinforced concrete layer 2, which is integrally laminated on the surface of the ALC 5l, is formed as a concrete layer 1) containing fibers and having a drying shrinkage rate of 0.08% or less. The lower the drying shrinkage rate of the fiber-reinforced concrete layer 2, the better the effect on the constructed panel, and it is preferably 0.005% or less, particularly 0.03% or less.

The drying shrinkage rate used in this S is the drying shrinkage rate measured by the following method.

Test specimen used for measurement: Cast in a mold so that the size is 16 x 4 do.

A cage plug consisting of a flat chip with steel balls embedded therein is fixed and prepared on the formwork surface with adhesive so that the gage distance movement is about 14 cm.

Measurement method The measurement method shall be based on the contact gauge method of JIS A1121 r Mortar and Concrete Length Change Test Method.

Base length measurement.

Immediately measure the base length of the cast specimen after demolding.

First, place the standard gauge on a horizontal table, press the measuring point of the contact gauge against the gauge plug of the standard gauge, measure using the dial gauge, then reverse the left and right sides of the contact cage and repeat the same procedure. method, and the average value XO
Find I.

Next, place the test specimen on a horizontal table with the side on which the gauge plug is attached facing up, press the contact gauge against the cage plug of the test specimen, and repeat the measurement using the same method as above to obtain the average value XO2. seek.

Measurement of length after shrinkage After storing the specimen for 180 days at a temperature of 20 ± 1°C and a humidity of 60 ± 5% (RH), the measurement was repeated in the same manner as the base length measurement described above, and the average Find the value X, XI2.

Drying shrinkage rate in the present invention.

Each measurement value obtained under the above conditions is calculated as a base length.

The drying shrinkage rate is calculated as the rate of change in length.

In order to keep the drying shrinkage rate of the fiber-reinforced concrete layer 2 to 0.08% or less as measured by such a measuring method, the cement used in the shovel must be mixed with 5 to 15% by weight of sulfate radicals (
SO,) and (CaO+0.7SO5)/
(Si02”Al2O3”Fe203) ratio is 1.5
The following hydraulic cement shall be used.

In addition, by adjusting the content ratio of sulfate radicals used in the saw and the hydraulic ring, the drying shrinkage rate of the fiber reinforced concrete layer 2 can be made 0.05% or less, and even 0.03% or less. can.

It is preferable that the fibers used in the rice are weather resistant, resistant to chemical changes caused by cement, etc., and able to withstand impacts during concrete placement. , wI edge fibers, carbon fibers, aramid fibers, acrylic fibers, vinylon fibers, polypropylene fibers, and other organic fibers are used.

The fibers used in Koshi have a fiber length of 3 to 100 mm,
It is preferable to have a fiber length of 10 to 30m+n, and more preferably a fiber length of 10 to 30m+n.Fibers with a fiber length of less than 3mIN have a low reinforcing effect, and fibers with a fiber length of 100mm or more can stably and efficiently incorporate fibers into the mortar. It is difficult to put it into practical use because it cannot be uniformly dispersed.

Note that the fibers used here may be in the form of a mat. This fiber mat preferably has a bulk density of 0.1 g/c+n' or less, preferably 0.02 to oag/cm<3>, in order to be effectively impregnated with mortar. If this bulk density is greater than 0.1 g/cm3,
Mortar is impregnated with mat and is not suitable for practical use.

Next, the fibers contained in the fiber reinforced concrete layer 2 are preferably mixed in an amount of 0.5 to 6 parts by weight per 100 parts by weight of mortar consisting of sand, water, water reducing agent, etc. forming the fiber reinforced concrete layer 2. , the blending amount of this fiber is 6
If the amount is more than 1 part by weight, the fluidity of the mortar will be inhibited, making it difficult to mold, making it difficult to remove air from the molded product, and creating a large number of nests in the fiber reinforced concrete layer 2 due to the mixed fibers. may occur, so it is not practical. Furthermore, if the fiber content (1) is less than 0.5 parts by weight, the reinforcing effect may be poor and cracks may occur in the formed panel, which is also not suitable for practical use.

Further, the aggregate constituting the fiber-reinforced concrete layer 2 may be silica sand, river sand, or even sea sand, and when the fiber-reinforced concrete layer 2 is poured using the premix method, there is no need to particularly limit the particle size. When forming this fiber-reinforced concrete layer 2 by a spray method, No. 4 to No. 7 silica sand,
or a mixture thereof, or river sand that has been sieved to a minimum of 2Illfl]. Preferably, No. 5 to No. 6 silica sand or a mixture thereof, river sand with a sieve of 1+ pm or more is used. More preferably, an equal weight mixture of No. 5 silica sand and No. 6 silica sand is used as the aggregate.

Note that any water reducing agent may be used, and in this example, Mighty #150 (Kao) was used.

Next, the mortar constituting the fiber-reinforced concrete layer 2 is mixed with the following: Cement: 100 parts by weight Sand: 0 to 150 parts by weight Water reducing agent: C to 2 parts by weight Water: 23 to 50 parts by weight Fiber: 0.5 to 6% by weight relative to the above mortar shall be.

As the mortar composition of this fiber reinforced concrete layer 2,
When the amount of sand mixed is reduced, there is a tendency for the formed fiber reinforced concrete layer 2 to undergo large drying shrinkage,
If the amount of sand is more than 150 parts by weight, the dispersibility of the fibers will be reduced and the reinforcing effect of the fibers will tend to be poor.

Furthermore, if the amount of water added is less than 23 parts by weight, the fluidity of the mortar will be poor, the workability will be poor, and the formed backing layer 2 will have a tendency to form cavities. On the contrary,
When the amount of water added is more than 50 parts by weight, it is observed that the solid content tends to settle and separate, and the drying shrinkage rate increases.

In view of the cost, in this example, it is preferable to form the fiber reinforced concrete layer 2 using fiber reinforced mortar having the following more practical mixing ratio.

(1) Cement 100 parts by weight Sand 60-110 parts Water reducing agent 0.5-12 parts by weight Wood 30-40 M parts Alkali-resistant glass fiber 2-6% by weight of the above mortar The mortar containing this fiber can be sprayed. It can be used in both the premix method and the premix method.

(2) Cement 100 parts by weight Sand 70 parts by weight Water reducing agent 1 part by weight Water 35 parts by weight Alkali-resistant glass! & fiber 5% by weight based on the above mortar The fiber-reinforced concrete layer 2 is formed by a spray method using the mortar containing this fiber.

(3) Cement 100 parts by weight Sand 100 parts by weight Water reducing agent - Water 40 parts by weight Alkali-resistant glass fiber 3% by weight of the above mortar Using mortar containing this fiber, form fiber reinforced concrete layer 2 by premix method do.

(4) Cement 100 parts by weight Sand 50-100 parts Water reducing agent 0.3-1.5 parts by weight Wood 25-45 parts by weight Alkali-resistant glass fiber 2-6 fIfr% of the above mortar The mortar containing this fiber is It depends on whether you use the spray method or the premix method.

The 'u & fiber reinforced concrete layer 2 using the mortar with the above mixing ratios (1) to (4) has a drying shrinkage rate of 0.08% or less, and most of them are 0.05% or less, especially The drying shrinkage rate of the fiber-reinforced concrete layer 2 composed of the mixing ratio in (3) above is 0.03% or less, and has the feature that the joint surface between it and the panel main body 1 is maintained stably. There is.

In addition, the cement used in the rice was all made from the above-mentioned sulfate root (
503) in an amount of 5 to 15% by weight, and (CaO+0.
7SO3)/ (SiOz”Al2O,”Fe20s)
Hydraulic cement with a ratio of 1.5 or less is used.

Further, when a fiber reinforced concrete layer 2 was formed by preparing a mortar having the following mixing ratio using this hydraulic cement, none of the mortar was suitable for practical use.

(5) Cement 100 parts by weight Sand 300 parts by weight Water reducing agent - Alkali resistant glass fiber 5% by weight based on the above mortar (6) Cement 100 parts by weight Sand 70 parts by weight Water reducing agent 1 part by weight Water 35 parts by weight Alkali resistant glass fiber 0.3% by weight based on the above mortar (7) Cement 100 parts by weight Sand 70. 1iir part Water reducing agent 1 part by weight Water 35 parts by weight Alkali resistant glass fiber 10% by weight based on the above mortar (8) Cement 100 parts by weight Sand 70 parts by weight Water reducing agent 1 part by weight.

Water 22 parts by weight Alkali-resistant glass fiber 5% by weight based on the above mortar (9) Cement 100 parts by weight Sand 70 parts by weight Water reducing agent 1 part by weight Water 70 parts by weight Alkali-resistant glass fiber 5% by weight or more (based on the above mortar) The fiber-reinforced concrete layer 2 consisting of the mixing ratios 5) to (9) does not have sufficient strength, has extremely poor formability, and has too high a drying shrinkage rate, and is not suitable for practical use. The mortar with this mixing ratio (5) is a normal mortar with 51% by weight of alkali-resistant glass fiber added in the mortar ratio.
Compared to the fiber-reinforced concrete layer 2 composed of mortar with the mixing ratio of 3), the strength is half X, making it unsuitable as a reinforced concrete layer. In addition, the fiber-reinforced concrete layer 2 composed of mortar with the mixing ratio of (6) has a very small reinforcing effect due to the fibers, and is difficult to put into practical use.
The fiber-reinforced concrete layer 2 composed of mortar having the mixing ratio (7) has many cavities or bubbles, and has difficulty in reinforcing effect. Furthermore, fiber-reinforced concrete layer 2 made of mortar with the mixing ratio (8) has poor fluidity and is difficult to form, and fiber-reinforced concrete M2 made of mortar with the mixing ratio (9) has poor fluidity. , Sedimentation and distribution of the solid content of the mortar was observed, and this also had difficulty in molding, making it unsuitable for practical use.

When forming fiber-reinforced concrete layer 2 using ordinary Portland cement for mortar with each of the mixing ratios (1) to (9), the strength deteriorates over time and the drying shrinkage rate is large. , it is unsuitable as a reinforced concrete layer. For example, ordinary Portland cement, which has a common blending ratio for GRC, is 100! i weight part sand
70 parts by weight water reducing agent
When ALCLiF2 fiber-reinforced concrete layer 2 was made using a mortar consisting of 1 part by weight of water and 35 parts by weight of alkali-resistant glass fiber and 5% by weight of the above mortar, its drying shrinkage rate was close to 0.2%. Glass fibers have been observed to deteriorate over time, making them unsuitable for practical use as a means of reinforcing lightweight concrete materials.

Incidentally, to the mortar forming the above fiber reinforced concrete layer 2, a synthetic resin emulsion such as vinyl acetate, ethylene vinyl acetate, acrylic ester, etc. is added in a solid content of 0 to 10% by weight based on the mortar. Also, add styrene-butadiene rubber latex to the mortar at a rate of 0 to 10
Add up to % by weight. Furthermore, polyethylene oxide,
Add water-soluble resin such as methyl cellulose to mortar from 0 to
Adding 2% by weight increases the bonding force between the fiber reinforced concrete layer 2 and ALCLiF2 formed, or increases the mechanical strength of the fiber reinforced concrete layer 2, or reduces drying shrinkage of the fiber reinforced concrete layer 2. or increase the water resistance of the fiber-reinforced concrete layer 2.

Further, by adding 0 to 20% by weight of silica fume having a particle size of 10 μm or less to the mortar, the mechanical strength of the fiber-reinforced concrete layer 2 is increased and drying shrinkage is suppressed.

Furthermore, lightweight aggregates such as shirasu balloons and perlite can be added to the mortar by O~20! A lighter fiber-reinforced concrete layer 2 can be formed by adding i amount % or by adding 0 to 5% by weight of a foaming agent to the mortar.

The fiber-reinforced concrete layer 2 thus formed may be provided so as to cover only the two surfaces of the ALCLiF, or may be provided on both surfaces as a so-called sandwich panel structure.

Furthermore, it may be a so-called anchor structure panel in which a fiber-reinforced concrete layer 2 is provided so as to cover the circumferential surface of the ALCLiF2.

In addition, on the surface of the fiber reinforced concrete layer 2, natural stone cut into plates, tiles, ceramics, glass, etc.
The panel may be constructed by bonding decorative steel plates or the like.

In the embodiment shown in FIGS. 2 to 4, a tile material is pasted on the surface of a fiber-reinforced concrete layer 2 constituting a panel, and first, it is not a decorative surface of a decorative material 3 made of tile material. After spraying a thin layer of mortar that does not contain fibers on the side, glass fibers and mortar are sprayed until a predetermined thickness is reached. The spraying thickness of this mortar varies depending on the shape, size, weight, etc. of the decorative material, but is generally 20 mm.
It is best to form it by moving it back and forth and compacting it with a defoaming roller.

Further, it is preferable to apply vibration to the cast mortar layer in the same way as precast concrete so that the mortar is completely contained between the fibers and to remove any air bubbles remaining in the mortar layer. When forming the fiber-reinforced concrete layer 2 by the vibration method, the reinforcing fibers may not be short fibers but may be a fiber mat having a bulk density of 0.1 g/cm' or less. The fiber mat used for this purpose has a bulk density of 0.02 to 0.08 g/m, which is determined by the thickness and weight of six 30 cm square mats piled up.
cm3 is more preferred.

Next, ALCLiF 2 is applied to the surface of the fiber-reinforced concrete layer 2 cast on the surface of this decorative material 3. This ALCL
For iF2, it is a good idea to spray a thin layer of mortar on the joint surface of this ALCII.

After further placing the fiber-reinforced concrete layer 2 on the thus assembled ALCLiF 2 surface in the same manner as described above, the panel is cured using a curing method such as indoor curing, underwater curing, or steam curing. As for the curing of this panel, it is more preferable to perform steam curing at a temperature of 20 to 60° C. for 2 hours or more.

The fiber-reinforced concrete layer of the panel thus obtained has a dry number Fi rate of 1 as measured by the measurement method described above.
It is below 1.08%, especially for sulfate roots (503
) is contained in an amount of 5 to 15% by weight, and (CaO+0.7S
Os) / (SiOz+8l 2 to 03 ◆F e 2
In the example panels using hydraulic cement with a ratio of 03) of 15 or less, the drying shrinkage rate of the fiber-reinforced concrete layer was 005% or less, and by further autoclave curing, the fiber-reinforced concrete layer Panels with drying shrinkage of 0.02 to 0.03% can be obtained.

As a result, in the formed panel material, surface breakage occurs at the joint surfaces between the fiber reinforced concrete layer 2 and the ALC board 1 and between the fiber reinforced concrete layer 2 and the decorative material 3 such as natural stone. That's not true.

Further, the panel does not warp due to drying shrinkage of the fiber-reinforced concrete layer 2, and the bonded natural stone does not warp, resulting in a panel with good dimensional stability.

[Effects of the Invention] The ALC composite panel according to the present invention is lightweight, has excellent heat insulation and sound insulation effects, and has a dense surface. This makes it possible to provide a panel that does not cause surface breakage due to drying shrinkage during pouring and curing of the fiber reinforced concrete layer between the fiber reinforced concrete layers covering the ALC board.

Furthermore, the panel itself does not warp or break due to drying shrinkage of the fiber-reinforced concrete layer in the formed panel, and cracks or the like do not occur in the fiber-reinforced concrete layer covering the ALC board.

Next, the fiber-reinforced concrete layer of the panel that is formed has a denser surface compared to the ALC board of the panel body, so it is possible to decorate the surface with paint, etc., and it is also possible to paste natural stones, tiles, etc. Furthermore, natural stones and the like can be stably pasted without causing any surface breakage on the bonding surfaces with the pasted natural stones and the like.

Furthermore, even when a fiber-reinforced concrete layer is provided around the entire circumference of the ALC board that makes up the panel, the drying shrinkage of this fiber-reinforced concrete layer is small, and the fiber-reinforced concrete layer that covers the entire surface of the ALC board is Will not break or crack.

In addition, since no surface cuts occur between the ALC board and the fiber-reinforced concrete layer that make up the panel, and between the decorative material pasted on the panel surface and the fiber-reinforced concrete layer, the Inconveniences such as infiltration of rainwater or freezing of infiltrated rainwater do not occur.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a main part of a typical ALC composite panel of the present invention, FIGS. 2 to 6 are sectional views of main parts of a concrete composite panel according to other embodiments, and FIG. 7 is a perspective view. be. 1... ALC board, 2... fiber reinforced concrete layer,
3... Decorative material, 4... Dovetail groove, 5... Through hole, 6...
...Metal fittings, 7...Mesh material.

Claims (1)

[Claims] 1. At least one surface of the ALC board is laminated on the surface,
An ALC composite panel covered with an integrated fiber-reinforced concrete layer, characterized in that the fiber-reinforced concrete layer is a fiber-reinforced concrete layer with a drying shrinkage rate of 0.08% or less.
LC composite panel.