JPH04169638A - Concrete composite panel - Google Patents

Abstract

PURPOSE:To obtain excellent performance of insulating effect of heat and sound with light weight by constituting the panel so as to respectively set specified values against drying contraction coefficient and thickness of a fiber reinforced concrete layer and arranging position of inner reinforcement. CONSTITUTION:The surface of a panel main body part 1 of light-weight concrete is covered with laminated integrated reinforced layers 2,2. Drying shrinkage factor of this fiber reinforced concrete layer 2 is set 0.08% or less. Where thickness on the front side and the rear side of the fiber reinforced concrete layer 2 are t1, t2, they are set as: 0<=t2/t1=2. Further where thickness of the panel is D and distance from the front face of the panel to inner reinforcement 3,3 is (d), they are set as: 2.4<=4d/D+t2/t1<=3.6. When the inner reinforcement 3 is arranged in proportion to t2/t1, it is respectively arranged on the position spaced from the surface of the front face of the panel by (6/10-9/10) D in the case of t1/t1=0, or (1/10-4/10) D in the case of t2/1=2.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention has a main body made of lightweight concrete such as lightweight concrete containing lightweight aggregate or lightweight concrete made of foamed concrete, and a fiber-reinforced concrete layer is provided on the surface of the body. The present invention relates to the provision of lightweight concrete 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.

Since Kameru precast concrete plates are produced in a factory, quality control is reliable, and they have the advantage that 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 board is usually over 150cm thick, transportation and installation require many hands and heavy equipment such as a crane, and the structure itself becomes heavy. There were some inconveniences. Furthermore, 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 may be necessary to separately prepare a concrete plate with a size and shape that fits 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 addition, 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 may fall off along with the inside of the lightweight board. There were other inconveniences.

Furthermore, 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 there are also problems in terms of water resistance.

From this point of view, we attempted to provide a panel material with a surface reinforcement layer with good impact resistance by using a lightweight material such as a foamed concrete 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, on both sides of relatively thick plates such as foam concrete plates,
A mortar layer containing alkali-resistant glass fiber is provided,
The so-called G
Attempts have been made to provide RC sandwich panels.

Furthermore, GR is applied to relatively thick plates such as foamed concrete plates.
Attempts have been made to provide a lightweight panel material with a reinforced surface by bonding C plates.

[The invention attempts to solve i! However, in this type of lightweight panel material, a lightweight material such as foamed concrete that constitutes this panel material, and a GRC that is laminated on the surface of the core material or plate material made of this lightweight material.
Since the two layers exhibit significantly different shrinkage behavior, 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 may suffer from surface breakage over time. there were.

In addition, when reinforcing is placed on this type of lightweight panel, fine cracks tend to occur in the concrete layer around the reinforcing bars as the panel material shrinks and changes after the reinforcing is formed, and these cracks weaken the panel and weaken the reinforcing bars. There was an inconvenience that caused difficulty in preventing rust.

In particular, the reinforcement arrangement for this type of lightweight panel is usually designed so that the internal reinforcement is located approximately in the middle of the thickness direction, so the GRC layer laminated on the core surface is G that is provided only on the
When the thickness of the RC layer is different, there is a disadvantage that the formed lightweight panel does not have the strength as designed.

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 peeling of the GRC layer from the cut edge of the surface.

In addition, GR is applied to board materials such as foam concrete boards that are formed.
In the method of obtaining panel materials by gluing C boards, the integrity between the board materials such as foam concrete boards and the GRC board is insufficient, and the adhesive deteriorates over time and the adhesive material changes due to heat. The GRC board may peel off due to the accompanying displacement of the joint surfaces, and it has also been impossible to affix heavy materials such as natural stone to the GRC board.

In view of the disadvantages of conventional concrete panel materials, the concrete composite panel according to the present invention has a panel body made of lightweight concrete and a fiber-reinforced concrete layer laminated integrally with this panel body. In addition, by improving the dimensional stability between the reinforcing bars arranged in the panel and this fiber-reinforced concrete layer, and by keeping the balance of the reinforcing positions, the area around the reinforcing bars To provide a concrete composite panel that prevents the occurrence of cracks in concrete, has well-balanced strength, and can also be pasted with natural stone, etc.

[Means for Solving the Problems] The concrete composite panel according to the present invention achieves the purpose of creating ridges, and in the invention of claim 1, the panel main body 1 is made of lightweight concrete, and at least the front surface of the concrete composite panel is made of lightweight concrete. is covered with a fiber-reinforced concrete layer 2 having a drying shrinkage rate of 0.08% or less, and this fiber-reinforced concrete layer 2
is integrated with the panel main body 1 to form the panel.

Next, in the invention of claim 2, the concrete composite panel to be formed is configured to have internal reinforcements 3.

Furthermore, in the invention of claim 3, the concrete composite panel to be formed has the following properties: tl...thickness of the fiber-reinforced concrete layer on the front side, t2...thickness of the fiber-reinforced concrete layer on the back side, and the thickness of the panel. However, the reinforcement position of internal reinforcement is D...
The thickness of the panel, d...the distance from the panel surface to the center of the internal striations, or the distance from the panel surface to the center of gravity of the panel in the thickness direction.

In addition, in the invention of claim 4, the concrete composite panel to be formed has internal reinforcements arranged gradually from the back side toward the front side, and the reinforcements extend from the panel surface to the thickness of the panel. In addition, in the invention of claim 5, the concrete composite panel to be formed is arranged such that at least four of the internal reinforcements 3 of the concrete composite panel are arranged in a fiber-reinforced concrete layer. These are the configurations supported by 2.

[Function] In the concrete composite panel according to the present invention, the drying shrinkage rate of the 18M reinforced concrete layer 2, which is laminated integrally with the panel main body 1 made of lightweight concrete, is 0.0.
Since it is 8% or less, the fiber-reinforced concrete layer 2 will not break at the joint surface with the panel main body 1 due to drying shrinkage over time.

In addition, the internal reinforcements 3 arranged in the panel are arranged because the drying shrinkage rate of this fiber reinforced concrete layer 2 is 0°08% or less when it is supported by the fiber reinforced concrete layer 2. Internal reinforcement 3 is fiber reinforced concrete layer 2
It will not be pulled by.

Furthermore, it functions to provide a well-balanced reinforcing condition to the concrete composite panel in which the internal reinforcements 3 are arranged in a state that satisfies the conditions of the concrete composite panel to be formed.

[Example] An example of a typical concrete composite panel according to the present invention will be described below with reference to FIG.

The panel body 1 used in this embodiment is preferably made of foamed concrete or concrete using foamed lightweight aggregate.As the foamed lightweight aggregate, inorganic foamed aggregate such as perlite or fuyolite is used. preferable.

In addition, the panel main body 1 used here has a fiber-reinforced concrete layer 2 laminated on the panel main body 1.
However, in order to reliably prevent surface breakage between the panel body and the fiber-reinforced concrete layer 2, the panel body is formed in a separate process from the formation of the fiber-reinforced concrete layer 2. A concrete plate may be formed and used.

In addition, the panel main body 1 used in this S is basically constructed without adding reinforcing wA fibers, but when the panel main body 1 is required to have particular strength, or when the panel main body 1 is particularly thin. In some cases, reinforcing fibers may be mixed with the mortar constituting the panel main body portion 1 to form the panel body.

Furthermore, when using the panel main body 1 with internal reinforcements 3, the internal reinforcements 3 incorporated in the panel main body 1 are removed from the panel main body 1 by fiber reinforcement, as shown in FIGS. It is preferable to position it even within the concrete layer 2. In this way, the internal reinforcements 3 are supported by the fiber-reinforced concrete layer 2 laminated on the surface of the panel main body 1, so that the internal reinforcements 3 buried within the panel body 1 are supported by the fiber-reinforced concrete layer 2. 2, it will be supported by “Okiichi”. Kasuru internal muscle 3
In order to improve the reinforcing effect, it is preferable that at least four locations of the internal reinforcing bars 3 are supported by the fiber-reinforced concrete layer 2.

When the internal reinforcing bars 3 are arranged in the panel main body 1 in this manner, an insert fitting for assembling the panel to reinforcing bars or the like can be attached using the internal reinforcing bars 3 as a base. - For boat fishing, a female threaded tube to which a bolt or the like is screwed is welded to this internal reinforcement 3, and the panel body 1 is configured such that the pipe opening of this female threaded tube protrudes from the surface of the panel body 1. At the same time,
The female screw tube protruding from the panel body is further fixed with a fiber-reinforced concrete layer 2 so that the pipe opening of the female screw tube faces the surface of the fiber-reinforced concrete layer 2. In the panel configured in this manner, the insert portion of the panel assembled to reinforcing bars etc. is reinforced by the internal reinforcing bars and the fiber reinforced concrete layer 2, and this insert portion will not be damaged.

The panel main body l prepared in this S has heat insulation properties, sound insulation properties, etc. required for each use of the formed panel, such as external wall material, partition material, heat insulation material, or sound insulation material. It is preferable to have a thick width.

Next, the concrete composite panel shown in FIG. 3 is constructed by integrally fixing a decorative material 4 such as natural stone or tile to the surface of a fiber-reinforced concrete layer 2 via a joint material 5. 4 is said to be a concrete composite panel with good stability.

Further, in the concrete composite panel shown in FIG. 4, auxiliary reinforcements 3a are arranged on the internal reinforcements 3, and a typical embodiment of the retention of the internal reinforcements 3 by the fiber-reinforced concrete layer 2 described above is shown.

Furthermore, in the concrete composite panel shown in Figure 5,
This shows an embodiment in which the entire circumferential surface of the panel body 1 is covered with fiber-reinforced concrete N2.

In addition, as shown in Figure 6, the joining edges of the panels are placed at different levels and are joined with a try- or wet-type caulking material 6 to increase the joining strength between the panels and to prevent rain when used as an exterior wall material. It may be arranged so that the finish is good.

The panel body 1 made of foamed concrete or lightweight concrete whose aggregate composition is foamed lightweight aggregate thus prepared.
The fiber-reinforced concrete layer 2 is laminated integrally on the surface of the
A concrete layer containing fibers and having a drying shrinkage rate of 0.08% or less is formed. The smaller 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 0.003% 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 formwork so that it is 16x4xt (JIL CI1.t = 1 to 4), steam-cured as necessary, and demolded after a specified period of time to obtain a test specimen. shall be.

A gauge plug consisting of a flat tip with steel balls embedded therein is fixed to the formwork surface with adhesive so that the gauge distance is approximately 14 cm.

Measurement method: The measurement method shall be in accordance with the contact gauge method of JIS^1129 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 scale (standard gauge) on a horizontal table, press the measuring point of the contact gauge against the gauge plug of the standard scale, measure with the dial gauge, then reverse the left and right sides of the contact gauge 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 tact gauge against the gauge plug of the test specimen, and repeat the measurement in the same manner as above to obtain the average value XO2. seek.

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

Drying shrinkage rate in the present invention: Use each measurement value obtained under the above conditions 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 this measuring method, the cement used here must be mixed with 5 to 15% by weight of sulfate radicals (
503) and (CaO+0.7SOs)/
(SiOz"Al2O3"FezO3) ratio is 1.
Hydraulic cement with a rating of 5 or less.

Furthermore, by adjusting the content ratio of sulfate radicals used in the plow and the water hardness, the drying shrinkage rate of the fiber-reinforced concrete layer 2 can be made 0.005% or less, further 0.003% or less.

Used in this! Preferably, the a-fiber has weather resistance, is resistant to chemical changes caused by cement, etc., and can withstand impact during concrete placement, and may include alkali-resistant glass fiber containing ZrO2, acrylic fiber, steel fiber,
Carbon fiber, aramid fiber, acrylic fiber, vinylon fiber, polypropylene fiber and other organic fibers are used.

The fibers used in rice have a fiber length of 3 to 100 mm,
The fiber length is preferably 10 to 30 ml11, more preferably. Fibers with a fiber length of less than 3 mm have a low reinforcing effect, while fibers with a fiber length of 100 mm or more cannot stably and efficiently disperse the mixed fibers uniformly in the mortar, making it difficult to put it into practical use.

Incidentally, the Ia fiber used in this S may be in the form of a mat. The fiber mat preferably has a bulk density of 0.1 g/cm 3 or less, preferably 0.02 to D, DBg/cm 3 in order to be effectively impregnated with mortar. If this bulk density is greater than 0.1 g/am3,
The mortar is difficult to impregnate into the mat, making it unsuitable 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 the mortar consisting of sand, water, water reducing agent, etc. that forms the fiber-reinforced concrete layer 2. If the blending amount of fiber is 5 parts by weight or more, problems such as inhibiting the fluidity of the mortar will occur, resulting in difficult molding and difficulty in degassing the molded product. Many nests may be formed in the fiber-reinforced concrete layer 2 due to am, which is not suitable for practical use. Furthermore, if the blending amount of fiber is less than 0.5 parts by weight, the reinforcing effect may be insufficient and cracks may occur in the formed panel, which is also not practical.

Furthermore, the aggregate constituting this 18M reinforced concrete layer 2 may be silica sand, river sand, or even sea sand, and when pouring the fiber reinforced concrete layer 2 by the premix method, there is no need to particularly limit the particle size. When this fiber-reinforced concrete layer 2 is formed by a spray method, use is made of No. 4 to No. 7 silica sand, a mixture thereof, or river sand sieved to a size of 211i or higher. Preferably, silica sand of sizes 5 to 6 or a mixture thereof, river sand obtained by sifting 1 mo 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 has a mixing ratio of 100 parts by weight of cement, 0 to 150 parts by weight of sand, 0 to 2 parts by weight of water reducing agent, 0 to 2 parts by weight of water, 23 to 50 parts by weight of fibers to the above mortar. .

As the mortar composition of this fiber reinforced concrete layer 2,
When the amount of sand mixed is reduced, there is a tendency for large drying shrinkage to occur in the formed fiber reinforced concrete layer 2,
If the amount of this 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, when the amount of water added is less than 23 parts by weight, the fluidity of the mortar becomes poor, the workability is poor, and there is a tendency for cavities to form in the formed backing layer 2. On the contrary,
If the amount of water added is more than 50 parts, the solid content tends to settle and separate, and the drying shrinkage rate tends to increase.

In this embodiment, it is preferable to form the fiber-reinforced concrete layer 2 using fiber-reinforced mortar having a more practical mixing ratio as shown below.

(1) Cement: 100 parts by weight Sand: 60 to 110 parts by weight Water reducing agent: 0.5 to 1.2 @Yabe Wood: 30 to 40 parts by weight Alkali-resistant glass fiber 2 to 6% by weight of the above mortar Mortar can be used in either the spray method or 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 of the above mortar Using mortar containing this fiber, fiber reinforced concrete layer 2 was formed by a spray method. Form.

(3) Cement: 100 parts by weight Sand: 100 parts by weight Water reducing agent - Water: 40 parts by weight Alkali-resistant glass fiber 31i% by weight based on 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 by weight Water reducing agent 0.3-1.51 parts by weight Water 25-45 parts by weight Alkali-resistant glass fiber 2-61 parts by weight of the above mortar Mortar containing this fiber can be used in either the spray method or the premix method.

The fiber-reinforced concrete layer 2 using the mortar having the mixing ratios (1) to (4) above has a drying shrinkage rate of 0.08% or less, and most of them have a drying shrinkage rate of 0.05% or less.
In particular, 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 bonding surface between it and the panel body 1 is maintained stably. ing.

Incidentally, all of the cements used in this S had the above-mentioned sulfate group (
503) in an amount of 5 to 15% by weight, and (cao+o,
A hydraulic cement having a ratio of 7so, )/(Sioz+^"20s"Fe2O,) 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 of 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 03% by weight based on mortar (7) 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 10% by weight based on the above mortar (8) Cement 100 parts by weight Sand 70 parts by weight Water reducing agent iz parts by weight 22 parts by weight Alkali-resistant glass fibers 51i% by weight based on the above mortar (9) Cement ICoIIL parts by weight Sand 70 parts by weight Water reducing agent 1 parts by weight Wood 70 parts by weight Alkali-resistant glass fibers 5% by weight or more based on the above mortar The fiber-reinforced concrete layer 2 with the mixing ratios (5) to (9) lacks sufficient strength, has extremely poor formability, and has too high a drying shrinkage rate, making it unsuitable for practical use. do not have. The mortar with this blending ratio (5) is made by adding 5% by weight of alkali-resistant glass fibers to a normal mortar, but the mortar with the above-mentioned (2) and (
Compared to the fiber-reinforced concrete layer 2 made of mortar with the mixing ratio of 3), the strength is half y, making it unsuitable as a reinforced concrete layer. Furthermore, the fiber-reinforced concrete layer 2 composed of mortar having the mixing ratio of (6) has a slight reinforcing effect due to the fibers, and is difficult to put into practical use.
The wA fiber-reinforced concrete layer 2 composed of mortar having the mixing ratio (7) has many cavities or bubbles and has a poor reinforcing effect. Furthermore, the fiber-reinforced concrete layer 2 made of mortar with the mixing ratio of (8) has poor mortar fluidity and is difficult to form. In this case, sedimentation and separation of the solid content of the mortar was observed, which also caused difficulties in molding.
Not suitable for practical use.

When forming the fiber reinforced concrete layer 2 using ordinary Portland cement for mortar with each of Kayoru's mixing ratios (1) to (9), the strength deteriorates over time and the drying shrinkage rate is large. Not suitable as a reinforced concrete layer. For example, 100 parts by weight of ordinary Portland cement and sand, which is a common blending ratio for GRC.
70 parts by weight reduced water i14
1 part by weight water 35 parts by weight alkali-resistant glass fiber When a mortar consisting of 5% by weight of the above mortar was used to form the fiber-reinforced concrete layer 2 of natural stone 1, the drying shrinkage rate was close to 0.2%. In addition, the glass fibers have been observed to deteriorate over time, making them unsuitable for practical use as a means of reinforcing lightweight concrete materials.

In addition, to the mortar forming the above #am 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 1 ofi % based on the mortar. In addition, styrene-butadiene rubber latex is added to the mortar from 0 to
Add up to 10% by weight. Furthermore, by adding 0 to 2% by weight of water-soluble resin such as polyethylene oxide or methyl cellulose to the mortar, the bonding force between the fiber-reinforced concrete layer 2 formed and the panel body 1 can be increased, or Increase the mechanical strength of the reinforced concrete layer 2 or suppress drying shrinkage of the fiber reinforced concrete layer 2,
Alternatively, the water resistance of the fiber-reinforced concrete layer 2 can be increased, and by adding 0 to 20% by weight of silica fume with a particle size of 10 μm or less to the mortar, the mechanical strength of the fiber-reinforced concrete layer 2 can be increased and the drying process can be improved. inhibits contraction.

Furthermore, a lighter fiber-reinforced concrete layer 2 can be obtained by adding 0 to 20% by weight of lightweight aggregate such as shirasu balloons and perlite to the mortar, or by adding 0 to 5% by weight of a foaming agent to the mortar. form.

The fiber-reinforced concrete layer 2 thus formed may be provided so as to cover only one side of the panel main body 1, or may be provided on both sides 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 entire circumferential surface of the panel body 1.

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 FIG. 3 described above, granite, which is a natural stone, is pasted on the surface of the fiber-reinforced concrete layer 2 constituting the panel. After spraying a thin layer of mortar that does not contain i# string, glass fiber 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 natural stone, but generally it is 2.
It is preferable to set the thickness to around 0 mm and form it while 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 such a vibration method, the bulk density is 0.1 g/ct13 without using the reinforcing fibers as short fibers.
The following [1 mattu] may also be used. The fiber mat used here has a bulk density of 0.02 to 0.08, which is determined by the thickness and weight of six 30 cm square mats piled up.
g/cm' is more preferred.

Next, lightweight concrete that will become the panel body 1 is placed on the surface of the fiber-reinforced concrete layer 2 placed on the surface of the natural stone 4.

After further placing the fiber reinforced concrete layer 2 on the upper surface of the panel main body 1 formed in this manner in the same manner as described above, the panel is cured using a curing method such as indoor curing, underwater curing, or steam curing. Take care of yourself. 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 drying shrinkage rate of 0.0 as measured by the measurement method described above.
In particular, it contains 5 to 15% by weight of sulfate radicals (SOS), and (cao+o, 7so,
)/(sio, +^120s+Fe2O,) ratio is 1.
In the panel of the example using the hydraulic cement which is 5 or less, the drying shrinkage rate of the wAM reinforced concrete layer is O,
OS% or less, and by further autoclave curing, the drying shrinkage rate of the fiber reinforced concrete layer is 0.
It is possible to obtain a panel of 0.02-0.03%.

As a result, in the formed panel material, there will be no surface breakage at the joint surfaces between the fiber-reinforced concrete layer 2 and the panel main body 1 and between the fiber-reinforced concrete layer 2 and the natural stone 4. .

Further, the panel did not warp due to drying shrinkage of the fiber-reinforced concrete layer 2, and the bonded natural stone did not warp, making it possible to obtain a panel with good dimensional stability.

Next, the reinforcement positions of the internal reinforcements 3 in the concrete composite panel according to the present invention will be explained.

Since there is a remarkable difference in strength between the panel body 1 and the fiber-reinforced concrete layer 2, the internal reinforcing bars 3 arranged in this concrete composite panel are made of concrete having a well-balanced load strength, etc. This is important in obtaining panels.

In examining the handling properties, mechanical strength, etc. of many implemented products, the thickness of the fiber-reinforced concrete layer 2 laminated on the front side was determined to be 1. and the thickness t2 of the fiber-reinforced concrete layer 2 laminated on the back side, the relationship is as follows, that is, the thickness t2 of the fiber-reinforced concrete layer 2 on the back side is within twice the thickness t on the front side, Furthermore, it is practically necessary that at least the fiber-reinforced concrete layer 2 on the front side exists.

The internal reinforcement 3 in the concrete composite panel is d　h 2.4≦−+−≦3.6 D t.

It is best to set it within the range of .

Here, D is the thickness of the panel, d is the distance from the panel surface to the center of the internal reinforcement if the reinforcement is one layer, or the center of gravity in the cross section if the reinforcement is two or more layers. Indicates the distance to the panel surface.

To explain the location of this internal reinforcement 3 more specifically,
- The internal reinforcements 3 are arranged at positions gradually moving from the back side to the front side of the concrete composite panel to be formed, and when the ratio of the angle is 0, the internal reinforcements 3 are From the panel surface of this concrete 1 degree composite panel, the internal striations 3 are positioned at one layer of the thickness of this panel, and when the ratio of 3 is 2, the internal striations 3 are During this time, the reinforcement position is determined by 1 degree in proportion to the thickness of the panel.

As an example of this reinforcement arrangement, the following concrete composite panel with a thickness of 100 mm was obtained.

(1) tI-20 t2'! = 5 d; 80 D wealth 100 (21 t + 20 t, = 10 D ± 100 (3) t, = 20 d; 55 D = 100 The concrete composite panels of the above (11 to (3)) obtained in this S are The strength against positive pressure and negative pressure of the wind on the panel, and the balance of strength as a panel were sufficiently suitable for practical use.

Furthermore, as an example of reinforcement, the following concrete composite panel with a thickness of 100 mm was obtained.

(41t, = 20 t2 = 5 d = 50 D = 100 (5) t, = 20 t2 = IO d = 40 D = 100 The concrete composite panels of (4) and (5) above thus obtained are: The strength against negative pressure and the balance as a panel were poor, and it could not be put to practical use. In particular, the concrete composite panel (4) had low strength against negative pressure, and the strength against negative pressure (5) was poor.
Concrete composite panels made in Japan had extremely unbalanced panel strengths and were not suitable for practical use.

C Effect of the invention] The concrete composite panel according to the present invention is lightweight, has excellent heat insulation and sound insulation effects, and has a dense surface. It is 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 layer and the fiber-reinforced concrete layer covering the panel main body.

Furthermore, the panel itself does not warp or break due to drying shrinkage of the fiber-reinforced concrete layer in the formed panel, and there is no occurrence of cranks or the like in the fiber-reinforced concrete layer covering the panel main body.

Furthermore, even if internal reinforcements are placed in the panel that is formed, there is no effect on the internal knots due to drying shrinkage of the fiber-reinforced concrete layer that makes up this panel, and cracks do not occur around the internal reinforcements placed in the panel. , does not cause cranking, etc.
The internal reinforcements are stably embedded in the concrete.

Next, by specifying the reinforcement positions of the internal reinforcements incorporated in this panel, the positive pressure generated on the panel due to wind,
It has the advantage of being a concrete composite panel with sufficient strength for practical use against negative pressure and a well-balanced strength.

In addition, by holding the internal reinforcements placed in the panel with the fiber reinforced concrete layer that forms this panel, the internal reinforcements placed inside the panel can be supported by this fiber reinforced concrete layer, making it easier to use. This produces a reinforcing effect. In addition, by holding the internal reinforcements arranged in this panel with this fiber-reinforced concrete layer on both sides of the panel main body, the internal reinforcements connect the fiber-reinforced concrete layers in a bridging manner. This results in an even more pronounced reinforcing effect.

Next, the fiber-reinforced concrete layer of the panel that is formed has a denser surface than the lightweight concrete 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 surface flaws on the bonding surfaces with the pasted natural stones and the like.

Furthermore, even if a fiber-reinforced concrete layer is provided around the entire circumference of the panel body of the panel to be formed, the drying shrinkage of this fiber-reinforced concrete layer is small, and the fiber-reinforced concrete layer covering the entire surface of the panel body will not break. No cracks or cracks.

In addition, there may be surface cuts between the panel body and the fiber-reinforced concrete layer that make up the panel, between the internal reinforcement and the concrete that makes up the panel, and between the decorative material pasted on the panel surface and the fiber-reinforced concrete layer. Therefore, inconveniences such as infiltration of rainwater from these cut edges or freezing of infiltrated rainwater do not occur.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part of a typical concrete composite panel of the present invention, and FIGS. 2 to 6 are sectional views of main parts of a concrete composite panel according to other embodiments. DESCRIPTION OF SYMBOLS 1... Panel body part, 2... Fiber-reinforced concrete layer, 3... Internal reinforcement, 4... Natural stone, 5... Joint material, 6... Caulking material.

Claims (1)

[Scope of Claims] 1. A concrete composite panel in which at least the front surface of a panel main body made of lightweight concrete is covered with a fiber-reinforced concrete layer laminated and integrated with the surface, wherein the fiber-reinforced concrete layer Drying shrinkage rate of reinforced concrete layer is 0
．． A concrete composite panel characterized by having a content of 0.08% or less. 2. The concrete composite panel according to claim 1, wherein the concrete composite panel has internal reinforcements. 3. The concrete composite panel is 0≦t_2/t_1≦2, where t_1...Thickness of the fiber-reinforced concrete layer on the front side, t_2...Thickness of the fiber-reinforced concrete layer on the back side, and the internal reinforcement of the panel The reinforcement position is 2.4≦(4d)/D+t_2/t_1≦3.6, but D
...thickness of the panel, d...distance from the panel surface to the center of the internal striations, or distance from the panel surface to the center of gravity of the panel in the thickness direction, according to claim 2. concrete composite panels. 4. Internal reinforcement is arranged in proportion to t_2/t_1 from the back side of the concrete composite panel to positions gradually toward the front side, and the internal reinforcement when the ratio of t_2/t_1 is 0. When the reinforcement is between 6/(10) and 9/(10) of the thickness of this panel from the panel surface, and the ratio of t_2/t_1 is 2, the internal reinforcement is from the panel surface, 1/(1) of the thickness of this panel
Claim 3 characterized in that it is between 0) and 4/(10).
Concrete composite panels as described. 5. The concrete composite panel according to claim 2, wherein at least four internal reinforcements of the concrete composite panel are supported by a fiber-reinforced concrete layer.