JPH03100258A - Execution of concrete lining - Google Patents

Abstract

PURPOSE:To prevent cracks and exfoliation by metallizing a concrete surface with plastics and metallizing a plastics metallization layer with metal or ceramics. CONSTITUTION:The surface of a concrete footpath plate 1 is metallized in about 200-1,000mum with thermoplastic EVA resin through gas metallization, and a plastic metallization layer 2 is formed. Then, the plastic metallization layer 2 is metallized in a thickness of about 100-500mum with aluminium or ceramics, and a metal or ceramics metallization layer 3 is formed. Therefore, a lining member which possesses the superior durability can be formed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for lining a concrete surface with metal or ceramics.

(Prior Art) Concrete for ceilings, walls, and floors (especially floors) of chemical factories, food factories, etc. is severely corroded by chemicals, food, etc. that are scattered or spilled.

In order to prevent such severe corrosion, so-called heavy-duty anti-corrosion methods have been used, such as applying a synthetic polymer paint to the concrete in the above areas, or pasting tiles made of metal such as stainless steel or ceramics. Lining method has been used.

In addition, as shown in Figure 4, metals and ceramics have been sprayed onto the surface of concrete 1 to decorate the surface of inorganic building materials such as concrete and cement, and to improve waterproofness. Continuous film 11 of
A technique for forming
No. 150, No. 61-15958).

(Problems to be Solved by the Invention) However, among the above-mentioned heavy-duty anti-corrosion lining construction methods, the method of applying a synthetic polymer-based coating material has a limit to the durability of the synthetic polymer-based coating material. The materials needed to be repaired regularly.

In addition, although the durability of metal or ceramic tiles is guaranteed, it is difficult to apply the anti-corrosion lining to joints and joints on-site. It was difficult to administer. For this reason, it was not possible to provide corrosion protection at the seams, and it could not be said to be a complete heavy-duty anti-corrosion lining construction method.

Furthermore, the technique of forming a continuous sprayed coating 11 of metal or ceramics on the surface of the concrete 1 shown in FIG. 4 for the purpose of decoration and waterproofing has the following problems.

That is, in general, when a hardened cement body (i.e., concrete) in which the hydration reaction has sufficiently progressed is heated,
Free water and gel water are lost at about 105°C. When heated further, some of the water that is chemically bound as a calcium silicate hydration product begins to dehydrate, resulting in approximately 250%
Approximately 20% of chemically bound water is lost at ~350°C.

On the other hand, the above-mentioned thermal spraying of metals and ceramics involves spraying molten metals and ceramics, and the melting point of these metals and ceramics is about 300° C. even if it is low.

When such a high-temperature molten metal or ceramic is sprayed directly onto the surface of concrete 1, the temperature of the surface of concrete 1 rises rapidly, and compounds such as AJ203 and Fe2O as well as calcium are generated in the surface layer of concrete 1. A rapid dehydration of the chemically bound water of the silicate hydration reactant occurs.

Due to the above dehydration, the surface layer of concrete 1 is approximately 2%
This causes volumetric shrinkage of the material, which may cause cracks 12, peeling, etc. as shown in FIG.

For this reason, in the past, only metals and ceramics with low melting points could be used, and the thermal spray materials used were limited to a narrow range.

Also, attempts have been made to place the metal or ceramic spraying port far away from the surface of the concrete 1 and increase the spraying distance to suppress the temperature rise on the surface of the concrete 1 as much as possible. However, in this method, the thermal sprayed coating 11, which is originally porous, became even more porous, and a dense continuous coating could not be obtained.

Furthermore, the coating 11 formed by thermal spraying of metal or ceramics has poor deformability and cannot follow cracks 12 in the base concrete 1, and as shown in FIG. There was also the problem that cracks 13 were generated due to the cracks 12.

The present invention has been made in view of the above points, and its objectives are to provide excellent durability, seamlessness, minimize volume shrinkage in the surface layer, and a wide range of materials that can be used. The purpose of this paper is to propose a method for constructing a continuous film lining with excellent deformability.

(Means for Solving the Problems) In order to achieve the above object, the present invention is characterized in that plastics are first sprayed onto the concrete surface, and then metals or ceramics are sprayed on the plastics sprayed layer. do.

Preferably, the above plastics are mixed at 200 to 1
The method is to thermally spray the above metal or ceramic to a thickness of 100 to 50 ml.

(Function) In the present invention, first, plastics are thermally sprayed onto the concrete surface. Since the melting point of plastics is considerably lower than that of metals and ceramics, it does not cause problems such as dehydration in the surface layer of concrete as described above.

Next, a metal or ceramic is sprayed onto the plastic sprayed layer. At this time, the sprayed plastic layer acts as a buffer layer and prevents problems such as dehydration in the surface layer of the concrete due to the high melting point of the metal or ceramic.

Further, the metal or ceramic to be thermally sprayed is struck in the form of hot particles at high speed against the thermally sprayed plastic layer.

Due to the high temperature and large slamming force at this time, a part of the plastic sprayed layer is melted and thermally decomposed, and unevenness is formed on the surface of the plastic sprayed layer. Metal or ceramic particles enter these irregularities, and the metal or ceramic sprayed layer and the plastic sprayed layer are strongly bonded by a so-called anchoring effect.

On the other hand, the above-mentioned concrete surface and the plastic sprayed layer are strongly connected by the anchoring effect of the unevenness of the concrete surface.

Therefore, the metal or ceramic sprayed layer is firmly bonded and integrated with the concrete surface via the plastics sprayed layer.

Furthermore, the plastic sprayed layer has deformability, and the lining according to the present invention exhibits a follow-up effect on cracks in concrete through the plastic sprayed layer.

In order to achieve the above effects, it is more preferable in the present invention that the plastic sprayed layer has a thickness of 200 to 1000 μs, and the metal or ceramic sprayed layer has a thickness of 100 to 500 m.

In other words, if the plastics sprayed layer is thinner than 200 μs, the high temperature metal or ceramic sprayed thereon will completely melt or thermally decompose, reducing the significance of providing the plastics sprayed layer.

Furthermore, even if complete melting or thermal decomposition does not occur, the deformability of the sprayed plastic layer will be insufficient. On the other hand, if it is thicker than 10004, the above-mentioned effect will be saturated and it will not only become uneconomical, but also it will not be possible to obtain the desired thickness with -degree thermal spraying operation, so the construction period will be extended,
This is a factor that increases thermal spraying costs.

On the other hand, the thickness of the metal or ceramic sprayed layer is not limited to the above thickness, and can be determined as necessary.

However, if it is thinner than 100m, there is no point in providing metal or ceramics, so 5o.

- If it is thicker, not only the adhesion will deteriorate, but also problems will arise in terms of cost. For this reason, in the present invention, the above thickness is usually used.

For the thermal spraying materials for plastics mentioned above, epoxy resins are used as thermosetting resins, and as thermoplastic resins,
Polyethylene resin, ethylene-vinyl acetate resin (hereinafter referred to as
EVA resin), polypropylene resin, polyester resin, nylon resin, vinyl chloride resin, polyphenyl sulfide resin (hereinafter referred to as PPS resin), etc. are used.

Gas spraying, arc spraying, plasma spraying, etc. are employed as thermal spraying methods for these resins.

The plastics sprayed layer is coated with the above-mentioned 20-degree spraying operation.
The thickness can be from 0 to 1000/ffi. Furthermore, the thermal sprayed plastic layer does not require a curing period as required when forming a coating film using liquid paint.

Therefore, in the present invention, metal or ceramic spraying can be performed immediately after plastic spraying.

This metal or ceramic spraying material includes aluminum, copper, zinc, tin, nickel, stainless steel, brass, bronze, phosphor bronze, and chromium.

Various other metals and alloys are used, and ceramic materials include Abu203, AJ2203 Si0
2. Various dry glazes (i.e., glass components), etc. are used.

As the thermal spraying method for these metal or ceramic materials, gas thermal spraying, arc thermal spraying, plasma thermal spraying, etc. are employed, similar to the thermal spraying method for plastics described above.

(Example) Example 1 Heat-floodable EVA resin (melting point 105°C) was sprayed on the surface of a concrete sidewalk board (30 marks x 30 cm x 5 marks) using gas spraying at a spraying distance of 30 cm, and No. 002 to 5 in Table 1 were applied. A plastic sprayed layer of the thickness shown was formed.

After that, aluminum (melting point: 660° C.) was sprayed as a thermal spraying material by arc spraying at a spraying distance of 15 cm to form a metal sprayed layer having the thickness shown in Nos. 092 to 5 in Table 1.

FIG. 1 is a schematic diagram showing the structure of the lining material thus obtained.

In the same figure, a plastic sprayed layer 2 made of EVA resin is formed on the surface of a concrete sidewalk board l.
A metal sprayed layer 3 made of aluminum is formed on this.

As described above, the plastic sprayed layer 2 and the metal sprayed layer 3 are firmly connected by the anchoring action of the plastic sprayed layer 2.

FIG. 2 is a schematic diagram showing how the two layers 2 and 3 are bonded. The surface of the plastic sprayed layer 2 has irregularities, and the metal sprayed layer 3 bites into these irregularities.

Next, as shown in FIG. 3, the surface of the above lining material (i.e., the surface of the metal sprayed layer 3 in FIGS. 1 and 2)
Attach a steel attachment (4 am The tensile adhesive strength was determined using a Kenken tensile tester, and the state of breakage was observed.

The results were as shown in Table 1.

For comparison, E
The adhesion strength was measured under the same conditions as above for the lining material obtained under the same conditions as above, except that VA resin was not thermally sprayed and aluminum was directly thermally sprayed to form a metal sprayed layer with the thickness shown in No. 11 in Table 1. In addition to determining this, the fracture condition was also observed.

The results are also shown in Table 1.

Table 1 Surface layer rupture near the interface between the thermal sprayed layer and concrete sidewalk board Example 2 Thermosetting epoxy resin was used instead of thermoplastic EVA resin, and ceramic (Ag2O) was used instead of aluminum.
, melting point 2053° C.) were used under the same conditions as in Example 1 to obtain lining materials of Nos. 017 to 10 in Table 2. The adhesive strength was measured under the same conditions as in Example 1, and the state of breakage was observed.

The results were as shown in Table 2.

Also, for comparison, except for thermal spraying of epoxy resin,
A lining material of N016 shown in Table 2 was obtained under the same conditions as above, the adhesive strength was measured under the same conditions as above, and the state of breakage was observed.

The results are also shown in Table 2.

Table 2: Surface layer fracture near the interface between the sprayed layer and the concrete sidewalk board (
Effects of the Invention) According to the construction method according to the present invention detailed above, it is possible to obtain the buffering effect of the plastic sprayed layer provided on the concrete surface, so even if high melting point metal or ceramics is sprayed, dehydration and volumetric shrinkage of concrete surfaces;
Furthermore, various kinds of troubles caused by heat such as cracks can be prevented.

Even if cracks or cracks occur in the concrete, the high deformability of the plastic sprayed layer allows it to follow the cracks or cracks, preventing the occurrence of cracks in the lining material. be able to.

As a result of the above, a dense continuous coating of an inorganic lining made of extremely durable metal or ceramic can be seamlessly applied on site in a short period of time.

Further, as mentioned above, metals and ceramics with high melting points can also be used, and the range of thermal spray materials that can be used is greatly expanded from those with low melting points to those with high melting points.

As described above, the construction method according to the present invention is extremely useful for heavy-duty anti-corrosion lining.

Moreover, if the thickness of the plastic, saw, etc. is set to a desired value, the above-mentioned effects will be even more pronounced.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram showing the structure of a concrete lining obtained by the construction method according to the present invention, Fig. 2 is a partially enlarged view of Fig. 1, and Fig. 3 is a concrete lining obtained by the construction method according to the present invention. An explanatory diagram showing the adhesive strength measurement procedure of
FIG. 4 is a schematic diagram showing the structure of a concrete lining obtained by a conventional construction method.

Claims (2)

[Claims] (1) A method for constructing concrete lining, which comprises spraying plastics onto the concrete surface and then spraying metal or ceramics onto the formed plastics sprayed layer. (2) The plastics are thermally sprayed to a thickness of 200 to 1000 μm, and the metals or ceramics are sprayed to a thickness of 100 to 50 μm.
2. The method for constructing a concrete lining according to claim 1, wherein the coating is thermally sprayed to a thickness of 0 μm.