JP2000274012A - Concrete tile and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a concrete tile excellent in performance by press-molding a hydraulic binder composition containing an inorganic lightweight aggregate containing an aluminum oxide component of a specific value or above, fibers and a hydraulic binder. SOLUTION: A hydraulic binder composition containing an inorganic lightweight aggregate, fibers, a hydraulic binder and water is press-molded in an unhardened state to obtain a concrete tile. The inorganic lightweight aggregate containing an aluminum oxide component of 20 wt.% or above, the inorganic lightweight aggregate having the specific gravity of 1.0 or below and the compressive strength of 8 MPa or above, or the inorganic lightweight aggregate containing the aluminum oxide component of 20 wt.% or above and having the specific gravity of 1.0 or below and the compressive strength of 8 MPa or above is used. The inorganic lightweight aggregate is hardly broken by the external force applied at the time of mixing, kneading and press-molding, and it holds its shape and can achieve a lightweight effect. When the inorganic lightweight aggregate is mixed at the absolute volume of about 5-40%, the moldability and surface property of the tile and the reinforcing effect of fibers can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a hydraulic binder composition containing at least about 20% by weight or more of an aluminum oxide component, an inorganic lightweight aggregate, fibers and a hydraulic binder. Or a concrete tile obtained by press-forming a hydraulic binder composition containing an inorganic lightweight aggregate having a specific gravity of 1.0 or less and a compressive strength of 8 MPa or more, a fiber and a hydraulic binder, or oxidation. Press-forming a hydraulic binder composition containing an inorganic lightweight aggregate containing approximately 20% by weight or more of an aluminum component, a specific gravity of 1.0 or less, and a compressive strength of 8 MPa or more, a fiber, and a hydraulic binder. The present invention relates to a concrete roof tile and its manufacturing method.

[0002]

2. Description of the Related Art Hitherto, JI has been used as a roof tile for a house.
Cosmetic asbestos slate for residential roof shown in SA 5423, thick slate shown in JIS A 5402, J
There is a clay tile shown in ISA 5208 and the like. Residential roof cosmetic asbestos slate is intended thickness made with papermaking method mixed with asbestos and water to cement of about 4 to 7mm, weighs about 60 to 90kg / 3.3m ² and lightweight at the time of laying, There is an advantage that the cutting property and the workability are good.

[0003] Thick slate is made by mixing cement and sand and water, pressing it into a predetermined shape, and curing it. The slate is about 11 to 16 mm thick, thick and thick. There is an advantage that the space between the roof tiles and the base plate becomes large at the time of laying, so that heat is hardly transmitted, and the ventilation base can be sufficiently provided, so that the base plate does not easily rot. Clay roof tiles are made by shaping clay as raw material into a predetermined shape and firing it.
4-20mm thick, thick, heavy,
In addition, there is an advantage that durability is high.

[0004]

However, the cosmetic asbestos slate for the roof of a house has a small thickness and no weight.
Also, when laying, there is a problem that heat is easily transmitted because the space between the slate and the base plate is narrow, and furthermore, the base plate is liable to rot because the ventilation is not sufficiently performed due to the small thickness. In addition, the use of asbestos may cause health problems.

A thick slate weighs about 1 when laid.
It has a weight of 30 to 160 kg / 3.3 m ² and has a problem that workability and cutability are poor. Further, there is a problem that the durability of the clay is slightly lower than that of the straw. In addition, clay and straw weigh about 150 to 200k when laid.
g / 3.3 m < ² >, which is heavy, and has poor cutting properties and poor workability.

As described above, the conventional tiles and the like have their advantages and disadvantages. However, when they are used in a general house, they are mainly used to make use of their respective advantages. We had to accept the disadvantages that came with it. For this reason, there has always been a problem that there is no feeling of weight, the workability is inferior, and the cutability is poor.

The size of the thick slate or clay straw is determined to be relatively small, being less than about 370 × 360 mm for standard products and less than about 485 × 350 mm for nonstandard products. Therefore, construction number of about 25 to 50 pieces of tiles per unit area /3.3m ² (3.3m ² = 1 tsubo)
Therefore, there is a problem that the workability of the roof tile is long and the workability is deteriorated, and the number of roof tiles per unit area is increased, so that the weight of the roof tile per unit area is increased.

The present invention solves the various problems of the conventional tiles as described above, while maximizing their advantages while minimizing the problems of the conventional tiles. It is intended to provide a concrete tile that can be made. Another object of the present invention is to increase the size of a tile as much as possible without using asbestos having a health problem, thereby improving the workability of the tile and reducing the weight per unit area.

[0009]

Means for Solving the Problems According to 1) of the present invention, a hydraulic binder composition containing an inorganic lightweight aggregate containing at least about 20% by weight of an aluminum oxide component, fibers and a hydraulic binder is press-formed. And made it into a concrete tile. No. 2) is a concrete tile obtained by press-forming an inorganic lightweight aggregate having a specific gravity of 1.0 or less and a compressive strength of 8 MPa or more and a hydraulic binder composition containing fibers and a hydraulic binder. .

3) contains aluminum oxide component of about 20% by weight or more, has a specific gravity of 1.0 or less, and has a compressive strength of 8% or less.
A hydraulic binder composition containing an inorganic lightweight aggregate having a MPa or higher, a fiber and a hydraulic binder is press-formed to form a concrete roof tile. 4) is that the mixed amount of the inorganic lightweight aggregate is approximately 5 to 40% in absolute volume.

[0011] 5) is that the concrete roof tile is a concrete roof tile containing approximately 1 to 20% by absolute volume of a synthetic resin foam. Item 6) is a concrete tile in which the concrete tile contains approximately 1 to 40% of sand in absolute volume.

7) The inorganic lightweight aggregate has a particle size of about 0.1.
It is set to 5 mm or less. 8) is that the concrete roof tile has a thickness of approximately 7 mm to 11 mm.

Item 9) is that the concrete roof tile has a fiber containing about 0.5 to 2% of fiber in absolute volume. 10) The fiber has a tensile strength of 10 ×
10 ³ (kgf / cm ² ) or more and Young's modulus is 30 × 10 ⁴ (kgf / c
m ² ) or more, and the elongation at break is 3% or more.

11) lies in the fact that the fiber is a vinyl roofing tile. 12) lies in the fact that the hydraulic binder is a concrete roof tile made of cement. Item 13) is a concrete roof tile in which fly ash and / or blast furnace slag is mixed at about 10 to 50% by weight of cement weight.

Item 14) shows a method of adding water to the hydraulic binder composition of items 1) to 13), kneading the mixture, and press molding.

[0016]

Embodiments of the present invention will be described below.

In the present invention, the aluminum oxide component is added to 20
Inorganic lightweight aggregate having a specific gravity of 1.0 or less and compressive strength of 8 MPa or more, or an inorganic lightweight aggregate containing an aluminum oxide component of 20% by weight or more and a specific gravity of 1 It is essential to use an inorganic lightweight aggregate having a compressive strength of not more than 0.0 and a compressive strength of not less than 8 MPa. The above-mentioned inorganic lightweight aggregate is hardly destroyed by an external force received when performing mixing, kneading and press molding, and can maintain its shape to obtain a lightweight effect. The aluminum oxide component is out of the range of 20% by weight or more, or the specific gravity is 1.
If the pressure resistance is less than 0 and the pressure strength is smaller than 8 MPa, the inorganic lightweight aggregate is destroyed by the external force at the time of mixing, kneading and press molding, and the lightweight effect cannot be sufficiently exhibited.

The pressure resistance referred to in the present invention means the pressure applied when 75% by weight of inorganic lightweight aggregate remains without being destroyed under hydrostatic pressure. Specifically, after immersing predetermined inorganic lightweight aggregate in water and leaving it for 24 hours,
Scoop the inorganic lightweight aggregate floating on the water surface,
Dry at 24 ° C. for 24 hours. Thereafter, the sample is placed in a tester (pressure-resistant container) together with water, pressure is applied, and the sample is left at a predetermined pressure for 5 minutes. Thereafter, the inorganic lightweight aggregate and water are taken out of the pressure vessel and left to stand. The aggregate floating on the water surface is collected by filtration, dried at 80 ° C. for 24 hours, and weighed. The pressure when the weight of the suspended inorganic lightweight aggregate becomes 75% by weight when the weight before the test is 100% by weight is the pressure resistance.

The inorganic lightweight aggregate of the present invention needs to have a specific gravity of 1.0 or less, preferably 0.8 or less. When the specific gravity is larger than 1.0, the effect of reducing the weight cannot be sufficiently exhibited, and it is necessary to add a large amount in order to reduce the weight.

The present inventors have generally used pearlite, shirasu balloon, and the like as inorganic lightweight aggregates, both of which have an aluminum oxide component content of 20% by weight or less and have a pressure resistance of not more than 20% by weight. An object of the present invention is to solve the problem of being easily broken by an external force received during mixing, kneading and press molding due to being low, failing to achieve sufficient weight reduction, and causing variations in specific gravity and performance of a molded product. Since the conventional aggregate itself has low pressure-resistant strength, the bending strength of a molded article using the same is low, and the drying shrinkage ratio is large, so that warp occurs in the tile. In this way, using an aggregate having a low compressive strength or reducing the amount of the aggregate mixed in in order not to cause a defect of the aggregate results in a large drying shrinkage ratio, resulting in warpage or deformation of the tile. It will be easier.

In the present invention, the mixing of about 5 to 40% by weight of the inorganic lightweight aggregate in absolute volume is not more than 5%, the drying shrinkage becomes large, and the tile is likely to be warped or deformed.
On the other hand, if it is 40% or more, the formability and surface properties of the tile are likely to be reduced, and additionally, the effect of reinforcing fibers mixed together is reduced. When the amount of the aggregate is in the range of about 20 to 30%, the formability and the surface property are particularly good, and the effect of reinforcing the fiber is not reduced, which is particularly effective.

When the synthetic resin foam is mixed with the hydraulic binder composition at about 1 to 20% in absolute volume, the weight of the concrete roof tile can be reduced and the resistance to freezing and thawing is improved, which is preferable. If it is 1% or less, the effects of reducing the weight and improving the freeze-thaw resistance are not sufficient, and if it is 20% or more, the bending strength tends to decrease.

In this case, as the raw material of the synthetic resin foam, various known materials can be used, and there is no particular limitation. Further, the synthetic resin foam may be a pulverized product or an irregular shape obtained by pulverizing the synthetic resin foam, but a spherical or substantially spherical shape, which is generally formed as a so-called bead, is more preferable. It is preferable because the measurement error of the weight and the volume is small, and the variation of the specific gravity of the concrete roof tile mixed with the weight is small, and the roof tile of stable quality can be obtained.
Further, when stress is applied to the concrete tile mixed with the synthetic resin foam, if it is a bead, it can be dispersed, and a high-strength concrete tile can be obtained. Since stress concentration is applied and strength is reduced, it is desirable to use a bead as much as possible.

Regardless of whether the synthetic resin foam is a pulverized product, a deformed product, or a bead, its average diameter is 2.0 mm or less,
More preferably, the range is 1.5 mm or less. If the average diameter is 2.0 mm or more, the number of synthetic resin foams per unit volume of the tile tends to be limited, and the strength tends to be weak. The average diameter when the synthetic resin foam is a pulverized product or an irregular shape is expressed as an average value of a maximum length and a minimum length.

The synthetic resin used as a raw material for the synthetic resin foam includes various copolymers such as styrene-based resins such as polystyrene, olefin-based resins such as polypropylene and polyethylene, acrylonitrile-styrene copolymer and styrene-ethylene copolymer. Polymers (of course, random, block,
Grafts, etc.), polyvinyl chloride, polyvinyl chloride resins such as polyvinylidene chloride, etc.
Among them, when polystyrene is used, the strength is strong,
It is most desirable because of its low cost. As the specific gravity, a true specific gravity of about 0.03 to 0.12 is appropriate.

Further, in the present invention, if only the inorganic lightweight aggregate is used, the cost increases. Therefore, a part of the inorganic lightweight aggregate may be replaced with sand. The amount of sand used is suitably in the range of about 1 to 40% in absolute volume, and more preferably in the range of about 5 to 15%. The mixture becomes slightly heavier when sand is mixed, but the other performances are almost the same as those using only inorganic lightweight aggregate. Therefore, it is preferable to determine the mixing ratio of the inorganic lightweight aggregate and sand each time in consideration of economy and weight reduction.

The sand to be used includes river sand, sea sand, mountain sand, crushed sand, silica sand, blast furnace slag sand and the like made of rock by natural action, and the particle size is preferably 5 mm or less, particularly 2.5 mm or less. The use of fine sand is preferred.
For example, the range may be about 2.6, and the type is not particularly limited.

As the particle size and shape of the inorganic lightweight aggregate,
1) In order to suppress a decrease in pressure resistance, 2) To improve the fluidity of a molding material obtained by adding water to a hydraulic binder or the like, the particle size is approximately 0.5 mm or less and the shape is reduced. Is preferably spherical.

Concrete tiles can be obtained by molding the hydraulic binder composition obtained by adding water to such inorganic lightweight aggregates, fibers, hydraulic binders and the like in an uncured state. The forming process in this case is usually pressure forming, and specifically, press forming is suitable. This is because it is difficult to easily form a thin product having a complicated shape such as a box shape by extrusion molding or paper forming.

That is, the concrete roof tile has a relatively small thickness of about 7 to 11 mm, excluding protrusions.
As shown in FIG. 1, a lower protrusion 2 is provided at the lower part of the front end of the concrete roof tile 1 so that the thickness of the roof tile can be made thicker in appearance. Upper projection 3 to prevent water leakage due to blow-up
And it is formed into a complicated uneven shape or a box shape such as providing a lower protrusion 4 for a bar to be hooked on a tile bar or the like on a field board (not shown). Therefore, press molding is preferable because these complicated shapes can be satisfactorily molded. In addition, the shape of the other parts of the concrete roof tile 1 may be flat or corrugated.

As a method of press molding, a hydraulic binder composition is kneaded with a water binder ratio of about 40%,
There are a pressure dehydration molding method and a dry press molding method in which the ratio of the water binder is reduced to about 25% and no dehydration is performed. Either method may be used.

The pressing pressure for press forming can be approximately the same as that of a thick slate manufactured by mixing sand and water into cement, which has been conventionally manufactured, and can be used for pressure dehydration forming. As the pressure in this case, for example, about 100 to 200 kgf / cm ² is suitable. Also, the pressurizing time may be approximately the same time as in the case of producing a thick slate, and the pressurizing time in the case of pressurized dehydration molding is, for example, a pressurizing time of about 2 to 10 seconds. Are suitable.

The reason why the average thickness of the concrete roof tile excluding the protrusions is set to be about 7 to 11 mm is 7 mm.
If the ratio is less than the above, the bending strength tends to be low, and the tile tends to be difficult to be formed. Although there is a method of improving the formability by reducing the amount of the added aggregate, it is not preferable because the disadvantage that warpage or deformation easily occurs as described above appears. On the other hand, if it is 11 mm or more, the weight increases, which tends to be unfavorable in workability, transport work and the like.

After the press molding, the concrete is cured by a normal curing process performed on a normal concrete product, for example, by curing in the air, in water, in steam, or in an autoclave. Complete. Furthermore, on the obtained concrete tile,
In order to improve the aesthetic appearance of the surface, painting or the like may be performed with an acrylic or acrylic silicone-based paint.

The fibers used in the present invention include inorganic fibers such as glass fibers. As the inorganic fibers, glass fibers are preferable, and alkali-resistant glass fibers are particularly preferable. In addition, synthetic fibers which are organic fibers are used, and vinylon fibers, nylon fibers, polypropylene fibers, and the like are preferable. Of these, vinylon fibers are particularly preferable because they have a high strength-improving effect due to the area of adhesion and the like, as described later. However, the fibers can be used alone or in combination according to the design of the tile and the required strength. The length of the fiber is preferably about 5 to 20 mm on average, but is not particularly limited. About 0.5 to 2% of such fibers are mixed in absolute volume, whereby a tough concrete tile having high bending strength can be obtained. If it is 0.5% or less, almost no improvement in bending strength is seen, and if it is 2% or more, the formability and surface properties of the tile become poor, and the fiber reinforcing effect is reduced. Approximately 0.8 to 1.6% of fiber mixed in absolute volume
Within this range, the formability and surface properties of the tile are particularly good, and the effect of reinforcing fibers is most obtained, so that it is particularly preferable.

Of the above-mentioned fibers, vinylon fiber has higher flexural strength than nylon fiber and polypropylene fiber, has good resistance to alkali, and has good adhesiveness with hydraulic binders, especially cement. Because it is good, it is preferably used. Alkali-resistant glass fibers are also preferably used because they have high bending strength, are resistant to alkali, and are nonflammable.

Since both the vinylon fiber and the alkali-resistant glass fiber have sufficiently high tensile strength and Young's modulus, when a load is applied in the thickness direction of the concrete tile of the present application containing these fibers, the tile is hardly bent and broken. It is difficult to perform, and the effect of improving the bending strength of the tile is high. On the other hand, the elongation at break was 2% for alkali-resistant glass fibers.
Is relatively small, whereas the vinylon fiber is sufficiently large at 5%. Accordingly, the concrete tile of the present invention containing vinylon fibers can withstand greater deformation in the thickness direction than the concrete tile containing alkali-resistant glass fibers, and has good deformation followability.

Here, the amount of deformation of each tile in the thickness direction due to an external load increases as the size of the tile increases and the number of sheets used per unit area decreases. When fibers are used, there is a limit in increasing the size of concrete tiles due to poor deformation followability. On the other hand, when vinylon fiber is contained in a concrete roof tile, such a restriction is small, and the effect of suppressing a decrease in strength due to the large size of the roof tile and suppressing breakage of the large roof tile is obtained. In addition, nylon fibers and polypropylene fibers have deformation follow-up properties, but tend to have a poor effect of improving the bending strength described above.

Based on such findings, the present inventors have
As the most preferred embodiment, by adding vinylon fiber to the concrete tiles and increasing the size of the tiles, the number of works per unit area is reduced to improve the workability, and the overlapping portions of adjacent tiles And reduced the weight of tiles per unit area. Here, in the case of increasing the size of a concrete tile using vinylon fibers, specifically, for example, the surface area, that is, the product of the vertical size and the horizontal size of the tile is 1700 cm.
² or more, more preferably it is preferred to 2000 cm ² or more. In addition, even if it is a fiber other than vinylon fiber, for example, the tensile strength is 10 × 10 ³ (kgf / cm ² ) or more, the Young's modulus is 30 × 10 ⁴ (kgf / cm ² ) or more, and the elongation at break is A fiber having a physical property of a rate of 3% or more can be favorably employed in the present invention as a reinforcing fiber when a tile is enlarged.

On the other hand, when the surface area of the tile is relatively small, for example, when the surface area is about 1700 cm ² or less, the amount of deformation of the tile in the thickness direction due to an external load is relatively small. Even if glass fiber is used, the problem of the breakage of the tile is unlikely to occur. Therefore, a sufficient reinforcing effect can be obtained by mixing alkali-resistant glass fiber into the concrete tile. Of course, even when vinylon fibers are mixed into such a concrete tile having a relatively small surface area, a sufficient reinforcing effect can be obtained. Therefore, in the present invention, vinylon fibers can be satisfactorily reinforced regardless of the size of the tile. It can be said that it is an excellent fiber having an effect.

Examples of the hydraulic binder include cement, blast furnace slag, gypsum, adhesives and the like. Among them, cement is most preferable because it has high strength, excellent water resistance, and is relatively inexpensive. As the cement, ordinary Portland cement, Portland cement such as early-strength Portland cement, ultra-high-strength Portland cement, Portland cement such as moderate heat Portland cement, or blast furnace cement, silica cement, mixed cement such as fly ash cement, or ultra-high-strength cement, Special cements such as expansion cements and cosmetic cements (white cement, color cement, etc.) and alumina cements can be used, and it is preferable to use them properly depending on the application. The proportion of water to be added to the hydraulic binder, that is, the ratio of the water binder (weight of water / weight of hydraulic binder) is suitably in the range of about 25 to 50% by weight. If it is 25% or less, the viscosity of the hydraulic binder composition tends to increase, and molding tends to be difficult. Conversely, if it exceeds 50%, the fibers and the aggregate tend to separate easily and the bending strength tends to decrease. When the water binder is mixed at a ratio of about 30% or less, the dispersion of the hydraulic binder is likely to be deteriorated and the mixing tends to be insufficient. Therefore, it is preferable to add an admixture such as a surfactant. The ideal amount of admixture is about 0.5 to 1.5% by weight of the binder. Examples of the admixture include an AE agent, a water reducing agent,
An AE water reducing agent, a high-performance AE water reducing agent, a surfactant, and the like can be used.
By improving about 0%, the quality can be stabilized, and more preferable results can be obtained. As described above, if the admixture is added, the water binder ratio can be controlled to a considerable extent, and the value of the water binder ratio is not a limited value.

Water is mixed with the hydraulic binder composition,
With regard to kneading, there is no particular limitation on the order of mixing with each component of the composition.

Further, fly ash or blast furnace slag (particle size of 5 mm or less, specific gravity of, for example, about 2.0 to 2.6) is used alone or in a mixture of about 10 to 50% by weight of cement weight. May be. It is preferable because the alkalinity of the cement is reduced by mixing these elements to make the cement weakly alkaline. When fly ash or the like is mixed in cement, the fluidity is improved, the surface becomes more beautiful, and when a synthetic resin foam is mixed, there is an advantage that it does not easily appear on the surface of the tile. Further, the long-term strength is improved, and a strong roof tile is obtained, which is preferable.

[0044]

EXAMPLE The inorganic lightweight aggregate used in this example was an alumina silicate balloon (manufactured by Ribor Co., Ltd.). However, when microcells (manufactured by Chichibu Onoda Co., Ltd.) were used, the same as the alumina silicate balloon was used. It can be used for These inorganic lightweight aggregates that can be used in the present invention,
Table 1 shows the results of comparison with the conventional lightweight aggregates of pearlite and shirasu balloon.

[0045]

[Table 1] Tables 2 and 3 show blending examples per 1 liter of volume in Examples and Comparative Examples of the present invention.

The EPS in Table 2 indicates expanded polystyrene, and its shape is a bead. As an admixture,
An AE water reducing agent was used. The length of the vinylon fiber was 6 mm. In addition, river sand having an average diameter of 2.5 mm or less was used as sand, ordinary Portland cement was used as a binder, and tap water was used as water.

[0047]

[Table 2]

[0048]

[Table 3] Table 4 shows the performance test results of Examples 1 to 9 above, and Table 5 shows the performance test results of Comparative Examples 1 to 7. * Test method Bending strength test: JIS A 5402 "Thick slate"
by. Frost damage test: According to JIS A 5208 “Clay straw”.

(At -20 ± 3 ° C in air for more than 8 hours, in water at 15-25 ° C
More than hours)

[0050]

[Table 4] Example 1 Approximately 25% of the weight of sand using aggregate
It becomes lighter, and the weight is about the same as the asbestos slate (thin: 5 mm thick). In addition, the bending strength has been improved, and cracks and splinters at the time of construction have been eliminated. Example 2: Weight is about 10% lighter than Example 1.
The bending strength does not decrease significantly, and there is no practical problem. Example 3: Although the weight is about 20% heavier than Example 1, there is no particular problem in construction. Example 4: Although the weight is about 10% heavier than Example 1, there is no particular problem in construction.

Example 5: Approximately 5% lighter in weight than Example 1 and excellent in frost damage. Although the bending strength is slightly lower, there is no practical problem. Example 6: About 10% lighter in weight than Example 1,
Moreover, it is excellent in frost damage. Although the bending strength is slightly lower, there is no practical problem. Example 7: About 15% heavier than Example 1, but no problem in construction. Example 8: About 25% lighter than Example 1.
Bending strength is low, but there is no practical problem. Example 9: About 20% heavier than Example 1, but no problem in construction.

[0052]

[Table 5] Comparative Example 1: Since the inorganic lightweight aggregate of the present invention was not used and a thick slate containing no fiber was used, the flexural strength was low and it could not be used. Comparative Example 2: Fiber was added to Comparative Example 1, but molding was not possible due to lack of fluidity. Comparative Example 3: Since the flexural strength is slightly low, cracking or cracking may occur during construction. It is about 40% heavier than the asbestos slate (thin: 4 mm thick). Comparative Example 4: Because pearlite was used, pearlite was destroyed during kneading and molding, the specific gravity varied, and molding was difficult. High water absorption lowers frost damage.

Comparative Example 5: Since a shirasu balloon was used, the shirasu balloon was broken during kneading and molding, the specific gravity fluctuated, and molding was difficult. High water absorption lowers frost damage. Comparative Example 6: Since no aggregate was used, the molded product was warped, and could not be used because of rattling. Comparative Example 7: Since the fiber was removed from the composition of Example 1, the flexural strength was too low to be used.

As is clear from Tables 4 and 5, the tiles of the examples have good characteristics, whereas those of the comparative examples have only low compatibility with practical use. Was. The weight at the time of laying the concrete roof tile of this example was about 65 kg / 3.3 m ² , so that it was reduced by about 50 to 60% as compared with the thick slate, and about 5 as compared with the straw as the clay.
A reduction of 5-70%. Also, compared with the asbestos slate, it can be reduced by about 25% from the thick asbestos slate (about 6 to 7 mm), and the laying weight can be about the same as the thin asbestos slate (about 4 mm). Was.

[0055]

The concrete roof tile of the present invention takes advantage of the advantages of the conventional roof tile to the utmost and at the same time minimizes the disadvantages. Specifically, the inorganic lightweight aggregate, fiber and water By reducing the drying shrinkage of concrete tiles obtained by mixing them with a hard binder appropriately, preventing warpage and deformation, improving the formability and surface properties of the tiles, and increasing the toughness You can get a roof tile.
In addition, by mixing the inorganic lightweight aggregate, the bending strength was able to be increased while lowering the specific gravity. By reducing the weight of the tile, the transportation cost was reduced, and by increasing the bending strength, cracking and cracking of the tile during construction were eliminated, and the workability was improved.

As described in Claims 1 to 4, the aluminum oxide component is contained in an amount of 20% by weight or more, the specific gravity is 1.0 or less, the pressure resistance is 8 MPa or more, or the aluminum oxide component is 20% by weight or more. When an inorganic lightweight aggregate having a specific gravity of 1.0 or less and a compressive strength of 8 MPa or more, and a hydraulic binder composition containing a fiber and a hydraulic binder are mixed and press-formed, the advantage described above is particularly remarkably exhibited. is there. When the synthetic resin foam contains approximately 1 to 20% in absolute volume as described in claim 5, an appropriate weight reduction is obtained, and not only is the freeze-thaw resistance improved,
The bending strength is not greatly reduced.

When the sand contains about 1 to 40% in absolute volume as described in claim 6, an appropriate weight reduction can be obtained, other performances are not reduced, and production at low cost can be achieved. It becomes possible. As in claim 7, when the particle size of the inorganic lightweight aggregate is approximately 0.5 mm or less, the bending strength of the molding material obtained by adding water to the inorganic hydraulic composition is not reduced. High molded products can be obtained. When the thickness of the concrete roof tile is in the range of about 7 mm to 11 mm as described in claim 8, the bending strength becomes appropriate, the press forming is easily performed, the work efficiency is improved, and the overall weight is moderate. There is the advantage of being heavy. When the fiber is contained in the concrete roof tile in an amount of about 0.5 to 2% in absolute volume, the formability at the time of press forming is good and a high bending strength can be obtained.

According to a tenth aspect, the fiber has a tensile strength of 1%.
0x10^Three(Kgf / cm^Two) The Young's modulus is 30 × 10^Four(K
gf / cm^Two) Physical properties with an elongation at break of 3% or more
When using a material with
The size of the concrete roof tiles.
Roof breakage is unlikely to occur even if the size is enlarged and enlarged
There are advantages. As claimed in claim 11, vinylon as the fiber
When fiber is used, the tensile strength is 20 × 10 ^Three(Kgf / cm^TwoAbout)
Degree, Young's modulus is 50 × 10^Four(Kgf / cm^Two) Above and break
Elongation at break was about 5%.
In this case, good bending strength and deformation followability can be obtained.
There is an advantage that breakage hardly occurs even if the tile is enlarged.
You.

When the hydraulic binder is cement as described in claim 12, it is most desirable because it is strong, excellent in water resistance and relatively inexpensive. In the case where fly ash, blast furnace slag, and the like are mixed in approximately 10 to 50% by weight of the cement weight as in claim 13, the alkalinity of the cement is reduced by mixing the fly ash or blast furnace slag, and the cement is made weakly alkaline. Is preferred. When fly ash or the like is mixed in cement, the fluidity is improved, the surface becomes more beautiful, and when a synthetic resin foam is mixed, there is an advantage that it does not easily appear on the surface of the tile. Further, there is an advantage that the long-term strength is improved and a tile having a strong strength is obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view of a concrete roof tile according to an embodiment of the present invention.

[Explanation of symbols]

 1. Concrete roof tile 2. Downward projection 3. Upper projection 4. Lower projection for beam

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) C04B 18/08 C04B 18/08 Z 18/14 18/14 A 28/04 28/04

Claims (14)

[Claims] 1. A concrete tile obtained by press-forming a hydraulic binder composition containing an inorganic lightweight aggregate containing at least about 20% by weight of an aluminum oxide component, a fiber and a hydraulic binder. 2. A specific gravity of 1.0 or less and a pressure resistance of 8 MPa.
A concrete roof tile obtained by press-forming a hydraulic binder composition containing the above inorganic lightweight aggregate, fiber and hydraulic binder. 3. An aluminum oxide component containing approximately 20% by weight or more, a specific gravity of 1.0 or less and a pressure resistance of 8 MPa.
A concrete roof tile obtained by press-forming a hydraulic binder composition containing the above inorganic lightweight aggregate, fiber and hydraulic binder. 4. The content of the inorganic lightweight aggregate is about 5 in absolute volume.
The concrete roof tile according to any one of claims 1 to 3, wherein the content of the tile is from 40% to 40%. 5. The concrete tile according to claim 1, wherein the concrete tile contains approximately 1 to 20% of synthetic resin foam in absolute volume. 6. A concrete tile having a sand content of approximately 1 in absolute volume.
The concrete roof tile according to any one of claims 1 to 5, wherein the content of the concrete roof tile is from 40% to 40%. 7. The particle size of the inorganic lightweight aggregate is approximately 0.5 mm.
The concrete roof tile according to any one of claims 1 to 6, wherein: 8. The concrete roof tile according to claim 1, which has a thickness of approximately 7 mm to 11 mm. 9. The concrete tile according to claim 1, wherein the concrete tile contains approximately 0.5 to 2% of fibers in absolute volume. 10. The fiber has a tensile strength of 10 × 10 ³ (kgf / c
m ² ) or more, Young's modulus is 30 × 10 ⁴ (kgf / cm ² ) or more,
The concrete roof tile according to any one of claims 1 to 9, wherein the fiber is a fiber having an elongation at break of 3% or more. 11. The concrete roof tile according to claim 1, wherein the fibers are vinylon fibers. 12. The concrete roof tile according to claim 1, wherein the hydraulic binder is cement. 13. The concrete roof tile according to claim 1, wherein fly ash and / or blast furnace slag are mixed in an amount of about 10 to 50% by weight of cement. 14. A method for producing a concrete roof tile, characterized in that water is added to the hydraulic binder composition according to any one of claims 1 to 13, which is kneaded and press-molded.