JPH07109164A - Inorganic material having frost-damage resistance - Google Patents

Abstract

PURPOSE:To obtain a porous inorganic material satisfying frost-damage resistance and simultaneously satisfying sound-absorbing, water penetrating and heat-insulating properties. CONSTITUTION:The objective inorganic material having frost-damage resistance has continuous holes of 0.2-2000mum in diameter of the empty hole and bulk specific gravity of 0.5-0.9. It is a board of <=25mm in thickness or this board having either one of a rising wall of <=25mm in thickness, a square column having a cross section of <=25mm in diagonal, a circular column of <=25mm in diameter and a peripheral wall of <=25mm in thickness rising from the periphery of the board. Or, it is a material having plural holes which open on one plane and uniformly distribute with a space between each other. The minimum distance between the centers of any pair of holes is <=25mm, the minimum distance between the closest outer wall and the center of each hole is <=25 and the thickness of the bottom of the hole is <=25mm.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water-permeable floor plate for roads, a muffler enclosure for an outdoor steam generator, a soundproof wall for an outdoor air conditioner,
The present invention relates to a freezing-resistant inorganic material used for construction outdoors such as an outer wall material for heat insulation of an incinerator installed outdoors.

[0002]

2. Description of the Related Art Since a porous inorganic material having communicating pores generally has water absorbability, it often breaks and is damaged by freeze-thawing when used outdoors. As a countermeasure against this, a method of performing water repellency or waterproof treatment is generally adopted, but the water repellency or waterproof treatment has a short effective period, and there is a problem that it is costly to maintain the effect.

It is known that the frost damage resistance is improved by adjusting the porosity and the diameter of the pores of the porous inorganic material. However, it is possible to satisfy the frost damage resistance, the sound absorption property, the water permeability and the heat insulation property at the same time. Inorganic material is not provided.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a porous inorganic material which simultaneously satisfies frost damage resistance, sound absorption, water permeability and heat insulation.

[0005]

The present invention has a thickness of 25 m.
A frost-resistant inorganic material having a plate shape of m or less and a communication hole having a pore diameter of 0.2 to 2000 μm and a bulk specific gravity of 0.5 to 0.9, and a plate shape having a thickness of 25 mm or less A hole having a diameter of 0.2 to 2000 μm, which rises from the portion and has any one of a rising wall having a thickness of 25 mm or less, a cross-section having a crossover length of 25 mm or less, and a cylinder having a diameter of 25 mm or less.
A freezing-resistant inorganic material having a bulk specific gravity of 0.5 to 0.9 is used as a means for solving the problems.

The present invention is a box type having a plate-shaped portion having a thickness of 25 mm or less and a peripheral wall having a thickness of 25 mm or less rising from the periphery thereof and having a communicating hole having a pore diameter of 0.2 to 2000 μm. However, a frost damage-resistant inorganic material having a bulk specific gravity of 0.5 to 0.9 and a frost damage-resistant inorganic material having a partition of 25 mm or less in thickness are used as means for solving the problems. .

The present invention also has a plurality of holes which are open on one surface and are evenly spaced from each other, and the shortest distance between the centers of the holes is 25 mm or less, and the shortest distance from the center of the holes to the outer wall surface. Is 25 mm or less, the thickness of the bottom of the hole is 25 mm or less, has a communicating hole with a pore diameter of 0.2 to 2000 μm, and has a bulk specific gravity of 0.5 to 0.9. It is a means for solving the problem.

In order to have good frost damage resistance, JIS
In the frost damage resistance test of the building outer wall material of A1435, it is necessary that the outer surface and the inner portion are not damaged as a result of repeating freeze-thaw for 100 cycles.

As the inorganic material of the present invention, there are used refractory insulating bricks and inorganic particles having a diameter of 0.5 to 2 mm which are sintered or hardened with a binder such as cement. The external shape is a plate, a wall rising from the plate-shaped portion, a pillar, a peripheral wall,
With partition, square column, hexagonal column, cylindrical,
It is arbitrary such as a cylindrical shape.

[0010]

Function: The inorganic material of the present invention has a pore size of 0.2 to 2000 μm.
The reason why the communication hole is provided is that if the pore size of the communication hole is smaller than or larger than 0.2 to 2000 μm, the water permeability, the heat insulating property and the sound absorbing property will be insufficient. Further, the bulk specific gravity of 0.5 to 0.9 means that the strength is insufficient if it is less than 0.5 and it cannot be practically used, and if it exceeds 0.9, the one having satisfactory water permeability and sound absorbing property is obtained. Because you will not be able to.

In the above-mentioned inorganic material, the present invention facilitates the entry and exit of water during freezing and thawing by setting the thickness of each part to 25 mm or less, and has water permeability, heat insulation, sound absorption, and frost damage resistance. It has been found that there is a possibility that

[0012]

【Example】

(Road permeable floorboard) Example 1 2.6 kg of water and 0.8 kg of bubble entraining agent were added to 36 kg of crushed stone having a particle size of 0.5 to 2 mm and 8 kg of cement, and the mixture was kneaded, compression-molded and solidified to give a thickness. A 25 mm paving interlocking block was made. The pore size distribution of the communication holes of this block is 0.2 to 1000 μm, and the bulk specific gravity is 0.2.
9. The water permeability was 10 ^-2 cm / sec. The above frost resistance test was conducted on this, but no abnormality was found.

Comparative Example 1 In Example 1, the thickness was 27 mm. When this was subjected to a freeze resistance test, cracking occurred at the end of one freeze-thaw cycle.

Comparative Example 2 In Example 1, the compression molding pressure was increased and the bulk specific gravity was 1.
It was set to 1. This was subjected to a freeze resistance test, freeze-thaw 1
Cracking occurred at the end of the cycle.

Comparative Example 3 In Example 1, the distribution of pore diameters of the communicating holes was set to 0.01-.
It was set to 0.18 μm. When this was subjected to a freeze resistance test,
Cracking occurred at the end of one freeze-thaw cycle.

Example 2 In Example 1, a diameter of 2 is used to strengthen the connection with the ground.
Feet having a length of 0 mm and a length of 30 mm were integrally provided on the back surface at intervals of 50 mm. A frost resistance test was conducted, but no abnormality was found.

(Heat Insulating Material) Example 3 210 having a length of 210 mm, a width of 100 mm and a thickness of 60 mm
A box type with one side open × 100 mm, a bottom and a peripheral wall with a thickness of 25 mm each, a fire resistance with a hole diameter distribution of 0.2 to 2000 μm and a bulk specific gravity of 0.8. Made of heat insulating brick. The thermal conductivity of this product is 0.2K
It was cal / mh ° C (at 35 ° C). This was subjected to a freeze resistance test, but no abnormality occurred.

Example 4 In Example 3, the thickness was 25 mm at the center in the longitudinal direction inside.
Formed a partition. This was subjected to a freeze resistance test, but there was no abnormality.

Comparative Example 4 In Example 3, the bottom thickness was 30 mm. When this was subjected to a freeze resistance test, cracks had already occurred at the end of one cycle of freeze-thaw, and the central portion was buckled and pulverized.

Comparative Example 5 In Example 3, the bulk specific gravity was set to 1.0. When this was subjected to a freeze resistance test, cracks had already occurred at the end of one cycle of freeze-thaw, and the central portion was buckled and pulverized.

Comparative Example 6 In Example 3, the pore diameter distribution of the communicating holes was set to 0.01 to.
It was set to 0.18 μm. When this was subjected to a freeze resistance test,
Cracking occurred at the end of one freeze-thaw cycle.

(Sound Absorbing Material for Outdoor Use) Example 5 The bulk specific gravity is 0.8, and the pore size distribution is 0.2 to 2000 μm.
m fireproof insulating brick, length 250mm, width 124
A block having a diameter of 10 mm and a depth of 44 mm was uniformly provided on one surface of a block having a size of mm and a thickness of 64 mm of 250 × 124 mm with a center distance of 20 mm. The thickness of the bottom of the hole is 20m
m. When this was subjected to a freeze resistance test, no abnormality was found. The sound absorbing characteristics of this sound absorbing material are measured according to JIS 1405
When measured by the normal incidence sound absorption coefficient measurement method for building materials by the in-pipe method, as shown in FIG. 1, the sound absorption coefficients of sounds in the frequency range of 400 to 5000 Hz were all 0.7 or more.

Comparative Example 7 The distance between the centers of the holes was 36 mm, and the depth of the holes was 38 mm.
A sound absorbing material similar to that of Example 5 was formed except that the thickness of the bottom of the hole was 26 mm. When this was subjected to a freeze resistance test, cracking had already occurred at the end of 10 cycles of freeze-thaw, and the central portion was buckled and pulverized.

Comparative Example 8 In Example 5, the bulk specific gravity was set to 1.0. When this was subjected to a freeze resistance test, cracking had already occurred at the end of 20 cycles of freeze-thaw.

Comparative Example 9 A sound absorbing material similar to that of Example 5 was prepared except that the pore size distribution was 0.01 to 0.18 μm and the bulk specific gravity was 0.9.
When this was subjected to a freeze resistance test, cracking occurred at the end of 10 cycles of freeze-thaw.

[0026]

According to the present invention, it is possible to provide a porous inorganic material which simultaneously satisfies frost damage resistance, sound absorption, water permeability and heat insulation.

[Brief description of drawings]

FIG. 1 is a diagram showing sound absorbing characteristics of a sound absorbing material of Example 5.

Claims (5)

[Claims] 1. A plate-like member having a thickness of 25 mm or less and a hole diameter of 0.1.
Has a communication hole of 2 to 2000 μm and a bulk specific gravity of 0.5 to
Inorganic material with frost resistance of 0.9. 2. A rising wall having a thickness of 25 mm or less, which rises from a plate-shaped portion having a thickness of 25 mm or less, a prism having a cross-section crossing length of 25 mm or less, and a cylinder having a diameter of 25 mm or less. Inorganic material resistant to frost damage described in. 3. A box type having a plate-like portion having a thickness of 25 mm or less and having a peripheral wall having a thickness of 25 mm or less rising from its periphery, having a communication hole having a hole diameter of 0.2 to 2000 μm, A freeze-proof inorganic material having a bulk specific gravity of 0.5 to 0.9. 4. The frost damage-resistant inorganic material according to claim 3, wherein the partition has a thickness of 25 mm or less. 5. A plurality of holes which are open on one surface and are evenly spaced apart from each other, and have a shortest center-to-center distance of 25
mm or less, the shortest distance from the center of the hole to the outer wall surface is 25
mm or less, the thickness of the bottom of the hole is 25 mm or less, there is a communication hole having a pore diameter of 0.2 to 2000 μm, and a bulk specific gravity of 0.5.
Frost-resistant inorganic material of ~ 0.9.