JPH07112949B2 - Thick roof tile manufacturing method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for manufacturing thick roof tiles.

[Conventional technology]

Conventionally, flat slate roof tiles made of fiber reinforced cement have been very often used as roof tiles, but roofs covered with this type of flat roof tile have the drawback that they do not have a solid feeling. However, it is often required to roof the roof with tiles having a high surface relief such as cement-based thick tiles.

[Problems of conventional technology]

However, a clay-based roof tile such as the above-mentioned Japanese roof tile is
Since it is manufactured by glaze and baking, the unit price is high and the weight per unit area (3.3 m ² ) is 150 kg to 16
It is heavy at 0 kg, and there is a constraint that the construction structure must be sturdy.

Further, the clay-based roof tile has a problem that it is vulnerable to frost damage, has heavy snowfall in winter, and may be naturally destroyed due to repeated freezing and thawing in a severely cold region.

Further, for the purpose of reducing the weight of the cement-based thick roof tile as described above, even if the thick tile is molded with an inorganic raw material such as cement and sand and necessary reinforcing fibers, the weight reduction is per unit area, It was only about 10 kg, and there was a problem that we could not achieve sufficient weight reduction.

[Problems solved by the invention]

The present invention has been made in view of the above problems, and an object thereof is to provide a method for manufacturing a thick roof tile that is easy to mold, lightweight, and excellent in cold damage resistance.

[Technology for solving problems]

That is, the thick roof tile manufacturing method of the present invention is cement / silica sand =
5 to 25 parts by weight of clay mineral, 2.5 to 7.5 parts by weight of pigment, and 0.5 to 1.5 parts by weight of memol cellulose are added to 100 parts by weight of the material having a composition of 2/3 to 3/2. Is uniformly kneaded by adding water, the kneaded material is extruded, cut and pressed to form the product shape, and then the formed body is coated with an aqueous emulsion paint, followed by primary curing and high-temperature high-pressure steam in an autoclave. It is characterized by curing.

[Action]

In the present invention, the basic composition is cement and silica sand in order to obtain a strong calcium silicate cured product by autoclave curing, and the composition ratio is cement / cement.
Quartz sand = 2/3 to 3/2 is for preventing the generation of unreacted silica or efflorescence depending on the relationship with the molar ratio of CaO / siO ₂ .

Bentonite, kaolin, and pennite (chlorite) are used as clay minerals.

These clay minerals are added for the purpose of improving the plasticity of the kneading material, and if the amount of 5 to 25 parts by weight relative to 100 parts by weight of cement and silica sand is less than 5 parts by weight, the plasticity of the kneading material cannot be sufficiently obtained. If it is more than 25 parts by weight, the plasticity is good, but the strength of the cement matrix is lowered, which is disadvantageous.

Known pigments are used, and the amount of the pigment added is within the range that does not cause the strength of the cement matrix to decrease.

Further, in the present invention, the extrusion molding method is used for molding, because the density of the structure of the molded body can be made dense, and as a result, the frost damage resistance strength is effectively imparted to the molded and cured body.

The purpose of applying an aqueous emulsion coating to the molded product before curing is to prevent the occurrence of efflorescence and the like during subsequent curing in the autoclave.

As described above, autoclave curing is performed in order to form a strong calcium silicate in the cement-silica sand mixture and obtain a hardened product having excellent strength.

〔Example〕

 Next, an embodiment of the present invention will be described.

The compounding materials shown in Table 1 were uniformly mixed in a dry state, and then a necessary amount of water was added thereto and uniformly kneaded so as to have a fluidity suitable for extrusion molding.

The numbers in the table indicate parts by weight.

Then, the kneaded product is extruded and molded, and the extruded product is cut into predetermined lengths, compressed by a press, shaped, and coated with an aqueous emulsion, 40 ° C. × 80% RH ×
After primary curing for 10 hours, 8 atm by autoclave
High temperature and high pressure steam curing was performed under the condition of × 15 hours.

The obtained molded product has a width of 335 mm, a length of 435 mm, and an arc-shaped cross section with a height of 50.
It has a shape having two mm ridges in parallel.

The breaking load (kg), the weight per sheet and the weight per unit area (3.3 m ² ) (kg) were measured for these, and the results in Table 2 were obtained.

Next, a freeze-thaw test was conducted, and no abnormality was found after 100 cycles.

〔effect〕

As described above, the present invention enables continuous mass production of a tough thick roof tile that is lightweight and has a dense structure.

Continuation of front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display area C04B 40/02

Claims (1)

[Claims] 1. To 100 parts by weight of a material in which cement / silica sand = 2/3 to 3/2 is mixed, 5 to 25 parts by weight of clay mineral, 2.5 to 7.5 parts by weight of pigment, and 0.5 to 0.5 parts of methylcellulose are used. Add 1.5 parts by weight, uniformly knead these raw materials by adding water,
A thick roof tile characterized by extrusion-molding the kneaded material, cutting, press-pressing to mold it into a product shape, coating the molded body with an aqueous emulsion paint, and then performing primary curing followed by high-temperature high-pressure steam curing by an autoclave. Manufacturing method.