JPS5825074B2 - Method for manufacturing resin-impregnated concrete containers and pipes - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing resin-impregnated concrete containers and pipes.

Various types of concrete, mortar, or porous civil engineering and construction materials have been made by impregnating and hardening synthetic resins to improve the properties of the base material.

However, in conventional products, the entire base material is made of a uniform material, and the resin impregnation process is also uniform.

These conventional methods are very effective when uniformity of resin-impregnated concrete is required throughout the material.

However, in general requirements, there is often no need for uniformity throughout.

In such cases, a method is sometimes used in which only one side of the base material is made of resin-impregnated concrete.

However, although the chemical resistance and high strength of resin-impregnated concrete as a whole are required, there are cases where the inner and outer layers may have different properties.

For example, in the case of a concrete container, if the environment in which the container is placed requires seawater resistance and the contents are strong acids,
In addition, for pipes, if the buried ground is carbonated acidic soil with a pH of 4 to 5 and the inflow is other strongly corrosive substances,
If a uniform material is used, it must be uniform to withstand aggressive substances.

In such a case, in order to make resin-impregnated concrete with different properties in the inner and outer layers, it is necessary to change the impregnated resin in the inner and outer layers, and to change the amount of resin impregnated in the inner and outer layers by applying resin impregnation twice. It is necessary to do this.

As a result of intensive research, the present inventors have discovered a method that allows the amount of resin impregnation in the inner layer and the outer layer to be different by a single resin impregnation treatment.

Therefore, the present invention is based on the discovery of this new knowledge.

According to the method of the present invention, when producing concrete that is a base material for resin-impregnated concrete, the amount of resin impregnation can be changed by changing the density of the inner and outer concrete layers.

For example, when producing concrete by centrifugal compaction, depending on the production method, the outer layer is made of dense concrete that is relatively impregnated with resin, and the inner layer is made of concrete (lightweight concrete or perlite mortar) that is easily impregnated with resin.

In the case of a concrete container, the lid and bottom shall be made of two layers as well.

Naturally, the outer and inner layers may have different densities depending on the purpose.

Concrete is made of two layers to change the impregnability (concrete that is easy to impregnate, and then density), so it is possible to change the material itself as described above, but it is also possible to change the layers by changing the composition of the same material. .

In this way, when the base material concrete consisting of two layers is impregnated with resin through the usual resin impregnation treatment process, the amount of impregnation differs depending on the layer even for the same time, making it ideal for purposes such as chemical resistance and strength. is obtained.

According to the method of the present invention, by using dense concrete in areas where a large amount of resin impregnation is not required, the amount of resin used can be reduced, which is very advantageous in terms of cost, and the resin impregnation treatment process Since only one step is required, there is no need to increase the number of resin impregnation treatment steps.

The present invention will be explained in more detail with reference to Examples below, but the present invention is not limited to these Examples.

Example A pipe specimen with an inner diameter of 100 mm, an outer diameter of 200 mm, a pipe thickness of 50 mm, and a length of 300 mm was made of ordinary concrete IJ-T (uniaxial compressive strength σ28-400 kg/i) with an outer thickness of 25 mm.
), an inner tube with a thickness of 25 mm was made using perlite mortar using centrifugal force.

Using this specimen, Material 4>4 weeks later, a predetermined resin impregnation treatment was performed, and the specimen was immersed in sulfuric acid acidic aqueous solutions of pH 3 and pH 1 (flow rate 10 cm/5 ec) to conduct an acid resistance test.

The amount of resin impregnated was 4.2% in the outer layer and 9.2% in the inner layer.

As a result of a one-month acid resistance test, both the inner and outer layers were hardly attacked by the pH 3 acidic solution, and the outer layer was slightly eroded by the pH 1 solution, but the inner layer was hardly affected.

Claims (1)

[Claims] 1. By casting the inner and outer layers of the container or pipe with different concrete materials, or by changing the mix of concrete materials for each layer, the density of the base concrete of the inner and outer layers of the container or pipe is different.2
1. A method for manufacturing resin-impregnated concrete containers and pipes, comprising forming a layered container or pipe and then impregnating the container or pipe with a resin.