JP2001250443A - Insulator and adhesive therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an insulator that allows a complicated configuration at a high productivity, and an adhesive for the insulator that has a sufficient fluidity and fillability in use. SOLUTION: A mixture of cement, pozzolan fine powder, aggregate with a particle size of 2 mm or less, water, dehydrating agent, organic fibers, and fiber-like or flake-like particles with an average particle size of 1 mm or less is cured forming an insulator of a high strength. The mixture is used as an adhesive for fixing the insulator together with a meal pin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insulator and an adhesive for the insulator, and more particularly, to an insulator and an adhesive for the insulator which are made of an ultra-high-strength hardened concrete.

[0002]

2. Description of the Related Art Conventionally, there have been insulators made of feldspar-based porcelain, cristobalite-based porcelain, alumina-containing porcelain, and the like, and since these have different performances and costs, they have been commercialized according to the purpose of use.

Further, metal pins are used to connect the insulators (generally called suspension insulators), but special cement is used as an adhesive for fixing the metal pins and the insulators. Have been.

[0004]

However, the conventional insulator is manufactured by firing a raw material for porcelain and then firing the same, so that the manufacturing method is complicated. This is problematic in that cracks easily occur. Further, since the conventional adhesive for insulators has insufficient fluidity and filling property at the time of use, improvement of workability is a major problem. Accordingly, the present invention has been made in order to solve the above-mentioned problems, and is intended to provide an insulator which can be manufactured with a high productivity even in a complicated shape, and an adhesive for an insulator which has sufficient fluidity and filling property during use and good workability. It is intended to provide materials.

[0005]

Means for Solving the Problems As means for solving the above-mentioned problems, the present inventors have at least cured a composition containing cement, pozzolanic fine powder, aggregate having a particle size of 2 mm or less, water, and a water reducing agent. We propose an insulator characterized by the following.
Further, the present invention proposes an insulator characterized in that the composition contains an organic fiber. In addition, the composition has an average particle size of 3 to 2;
An insulator characterized by containing 0 μm inorganic powder is proposed. Furthermore, an insulator characterized by including fibrous particles or flaky particles having an average particle size of 1 mm or less is proposed.

[0006] Further, an adhesive for insulator characterized by comprising the above-mentioned compound is proposed.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an insulator obtained by curing a composition according to the present invention and an adhesive for an insulator comprising the composition will be described in detail. The type of cement used in the present invention is not limited. Various portland cements such as ordinary Portland cement, early-strength Portland cement, medium heat Portland cement, low heat Portland cement, and mixed cements such as blast furnace cement and fly ash cement can be used.

In the present invention, in order to improve the early strength of a cured product (hereinafter also referred to as concrete) obtained by curing the composition, it is preferable to use an early-strength Portland cement. In order to improve fluidity, it is preferable to use a medium heat Portland cement or a low heat Portland cement.

As the pozzolanic fine powder, silica fume, silica dust, fly ash, slag, volcanic ash,
Silica sol, precipitated silica and the like. Generally, in silica fume and silica dust, the average particle size is 1.
Since it is 0 μm or less and it is not necessary to grind, it is suitable as the pozzolanic fine powder of the present invention.

By blending pozzolanic fine powder,
The concrete is densified by the microfiller effect and the cement dispersing effect, and the compressive strength is improved. On the other hand, when the amount of the pozzolanic fine powder increases, the unit water amount increases. Therefore, the amount of the pozzolanic fine powder to be added is preferably 5 to 50 parts by weight based on 100 parts by weight of the cement.

In the present invention, an aggregate having a particle size of 2 mm or less is used. Here, the particle size of the aggregate is 85% (weight).
It is a cumulative particle size (an aggregate larger than 2 mm may be included). If the particle size of the aggregate exceeds 2 mm, the strength decreases. It is preferable to use an aggregate having a maximum particle size of 2 mm or less, and more preferably to use an aggregate having a maximum particle size of 1.5 mm or less, from the viewpoint of the separation resistance of the composition, the strength after curing, and the like.

Aggregates include river sand, land sand, sea sand, crushed sand,
Silica sand and mixtures thereof can be used. The amount of the aggregate is determined based on the workability and separation resistance of the concrete, the strength after hardening and the resistance to cracks, etc.
50 to 250 parts by weight, preferably 8 parts by weight,
0 to 180 parts by weight is more preferred.

As the water reducing agent, a lignin-based, naphthalene-sulfonic acid-based, melamine-based, polycarboxylic acid-based water reducing agent, a high performance water reducing agent or a high performance AE water reducing agent can be used. Among them, high performance water reducing agent or high performance A
It is preferred to use an E water reducer. The amount of the water reducing agent added (outside the cement) is 0.5 to 50% in terms of solid content with respect to the cement, based on the fluidity and separation resistance of the injection material, the strength after curing, and the cost. 4.0% by weight is preferred.

In the present invention, the water / cement ratio is preferably from 10 to 30% by weight, more preferably from 15 to 25% by weight, from the viewpoint of fluidity and separation resistance of the composition, strength and durability of the cured product, and the like.

In the present invention, from the viewpoint of increasing the flexural strength of the concrete, it is preferable to include organic fibers in the composition.

The organic fibers include vinylon fibers, polypropylene fibers, polyethylene fibers, aramid fibers, carbon fibers and the like. Organic fibers have a diameter of 0.005 to
Those having a length of 1.0 mm and a length of 2 to 3 mm are preferred. The content of the organic fibers is preferably less than 10%, more preferably less than 7% of the concrete volume after setting.

In the present invention, from the viewpoint of increasing the packing density of concrete, it is preferable to include an inorganic powder having an average particle size of 3 to 20 μm, more preferably 4 to 10 μm. As the inorganic powder, quartz powder, limestone powder, oxide powder such as Al ₂ O ₃ , carbide powder such as SiC,
Among them, nitride powder and the like can be mentioned, and among them, quartz powder is preferable in view of cost and quality stability of the cured product. Examples of the quartz powder include quartz, amorphous quartz, and opal and cristobalite silica-containing powders. The amount of the inorganic powder is preferably 50 parts by weight or less, more preferably 20 to 35 parts by weight, based on 100 parts by weight of cement, from the viewpoint of the fluidity of the composition and the strength of the cured product.

In the present invention, from the viewpoint of increasing the toughness of concrete, it is preferable to include fibrous particles or flaky particles having an average particle size of 1 mm or less. Here, the particle size of a particle is the size of its maximum dimension (in particular, its length for fibrous particles). Examples of the fibrous particles include wollastonite, bauxite, and mullite, and examples of the flaky particles include mica flake, talc flake, vermiculite flake, and alumina flake. The compounding amount of the fibrous particles or flaky particles is the fluidity of the compound,
From the viewpoint of the strength and toughness of the cured product, the amount is preferably 35 parts by weight or less, more preferably 10 to 25 parts by weight, based on 100 parts by weight of cement. From the viewpoint of increasing the toughness of the cured product, it is preferable to use fibrous particles having a needleiness expressed by a length / diameter ratio of 3 or more.

In the present invention, the apparatus used for kneading the compound is not particularly limited, and a conventional mixer such as an omni mixer, a pan-type mixer, a twin-screw mixer, and a tilting mixer can be used.

The insulator of the present invention can be produced by injecting the kneaded compound into a mold coated with a release agent, curing, curing, demolding, and, if necessary, polishing.
The injection method is not particularly limited, and the injection can be performed by a conventional slurry pump or the like. The curing method is not particularly limited, and normal temperature curing, steam curing, or the like may be performed.

Here, steel, aluminum or the like having excellent workability is used as the mold, and this may be processed into an arbitrary shape.

Hereinafter, the present invention will be described with reference to specific examples. Here, the materials used in the present invention are shown below. Cement: Low heat Portland cement (manufactured by Taiheiyo Cement Co., Ltd.) Pozzolanic fine powder: Silica fume (average particle size 0.7 μm) Aggregate: 2: 1 (weight ratio) mixture of silica sand No. 4 and silica sand No. 5 Organic fiber: Vinylon fiber (diameter 0.6 mm, length 15 mm) High-performance AE water reducing agent: Polycarboxylic acid-based high-performance AE water reducing agent Water: tap water Quartz powder: Quartz powder with average particle diameter of 7 μm Fibrous particles: Wollastonite (average) 0.3mm length, needle ratio 4)

The mixing conditions are as follows. Cement: 100 parts by weight Pozzolanic fine powder: 32.5 parts by weight Aggregate: 120 parts by weight High-performance AE water reducing agent: 1.0% by weight (solid content) based on cement Water / cement ratio: 22% by weight

The above-mentioned compounding materials were put into a twin-screw kneading mixer at a time and kneaded to obtain a compound. Next, this was injected using a slurry pump from the middle inlet provided on the upper part of the steel formwork.

The obtained sample was subjected to steam curing at an initial temperature (20 ° C.) for 48 hours and at 90 ° C. for 48 hours, and after removing the mold, the surface was polished to obtain an insulator.

The compressive strength of the obtained insulator was as high as 210 MPa and the bending strength was as high as 25 MPa. In addition, productivity was improved without cracks. Further, shrinkage due to drying was as small as 1/10 or less of conventional concrete, and dimensional stability was secured.

Further, the metal pin and the insulator were fixed using the compound as an adhesive. The fluidity and the filling property during use were sufficient, and after filling, curing was performed in the same manner as described above. As a result, the fixing strength between the metal pin and the insulator was five times higher than in the past.

[0028]

According to the present invention, it is possible to provide a high strength insulator with higher productivity than before. In addition, an adhesive for insulator having sufficient workability and sufficient fluidity and filling property at the time of use can be obtained.

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Claims (6)

[Claims] 1. An insulator obtained by hardening a compound containing at least cement, pozzolanic fine powder, aggregate having a particle size of 2 mm or less, water, and a water reducing agent. 2. The insulator according to claim 1, wherein the composition contains an organic fiber. 3. The organic fiber has a diameter of 0.005 to 1.0 m.
The insulator according to claim 2, wherein the insulator is at least one fiber selected from vinylon fiber, polypropylene fiber, polyethylene fiber, aramid fiber, and carbon fiber having a length of 2 to 30 mm. 4. The insulator according to claim 1, wherein the composition contains an inorganic powder having an average particle size of 3 to 20 μm. 5. The composition according to claim 1, comprising fibrous particles or flaky particles having an average particle size of 1 mm or less.
4. The insulator according to any one of 4. 6. An insulator adhesive comprising the compound according to claim 1. Description: