JPS5825075B2 - Manufacturing method for polymer-impregnated concrete products - Google Patents

Description

[Detailed Description of the Invention] This invention involves curing and deaerating concrete having a hollow part placed inside a frame material, and then impregnating the microscopic voids of the concrete with monomer supplied to the hollow part under pressure. , relates to a method for producing a polymer-impregnated concrete product which is heated to form a polymer.

Japanese Patent Publication No. 49-34757 discloses that plastic monomers are impregnated into the minute voids of concrete products and thermally polymerized to increase bending strength and compressive strength, as well as exhibiting excellent freeze-thaw resistance, chemical resistance, etc. , Special Public Service 1977-
This is already known from Publication No. 22493.

However, in the conventional polymer impregnation method, the demolded concrete product is dried with hot air, vacuum degassed, and then impregnated with a monomer catalyst under pressure, and the monomer is polymerized by heating for surface treatment.

Drying concrete products with hot air evaporates the moisture in the concrete's microscopic voids to secure space for monomer impregnation, improve the adhesion between concrete and polymer, and ensure the continuity of the polymer. This is to prevent loss of the impregnating monomer due to increase in vapor pressure within the microscopic voids.

In addition, vacuum deaeration of concrete products speeds up the monomer impregnation rate, shortens the time required for impregnation, increases the monomer filling rate to ensure sufficient impregnation into the microscopic voids, and further improves thermal polymerization. This is to prevent loss of monomer due to thermal expansion of air.

The monomers impregnated into concrete are mainly methyl methacrylate and styrene, and plasticizers, crosslinking agents, polymerization accelerators, etc. are sometimes mixed in to improve the quality of concrete.

Most of the monomer impregnation methods are deaerated pressurized impregnation in which pressure is applied to promote impregnation.

Producing polymer-impregnated concrete products using the method described above requires equipment to dry the concrete products, sealed equipment for vacuum degassing and pressurized impregnation, and equipment to polymerize while preventing monomer loss during heating polymerization. be.

Moreover, as the size of the concrete product increases, the above-mentioned facilities and devices become larger and significantly more expensive.

For this reason, it is currently not possible to increase the size of polymer-impregnated concrete products.

The present invention has been proposed in view of the above, and after manufacturing a concrete product having a hollow part using a sealable frame material, the drying and vacuum necessary for manufacturing an N polymer-impregnated concrete product as it is without forming the frame material into a membrane. It is designed to be used as a container for deaeration, pressurized impregnation, and thermal polymerization.

Accordingly, according to the present invention, large polymer-impregnated concrete products can be manufactured easily, with a sealable frame and a heating device for the frame being the main equipment required.

The present invention will be specifically described below.
Concrete 2 is placed in the concrete 2, and a hollow part 3 is formed inside the concrete 2.

If the frame material 1 has a long cylindrical shape and the concrete 2 is cast in a tubular shape, the hollow portion 3 will be the circular interior of the pipe material.

The frame material 1 described above consists of a frame body 4 with both ends open, which can be divided into several parts, for example, and lid bodies 5, 5 that close both ends of the frame body 4, and is made airtight and watertight by using a backing or the like. It can be closed and can withstand high temperatures and pressures.

After concrete 2 is poured into the frame material 1 described above so as to have a hollow portion 3, the frame material 1 is heated by the heating device 6.

If the heating temperature by the device 6 is 100° C. or lower, the frame material 1 may be heated with the lid 5 removed.

However, if the heating temperature is 100° C. or higher, the frame 4 is sealed with the lid 5 and heat cured.

With this heat curing, the moisture contained in the concrete evaporates inside the frame material 1, resulting in high temperature and high pressure, and some of the silica and calcium, which are difficult to react, react to form stable water-use products. The strength will be high.

There are many types of heating devices 6, such as those for oil materials that soak the frame material 1 in heated oil, those that use heated air instead of heated oil, and those that heat the frame material 1 using electricity or high frequency. C can be done using the following equipment.

After the frame material 1 is heated and the concrete inside is cured as described above, a deaeration process is performed to remove the water vapor inside and remove the air in the hollow part 3 and minute voids in the concrete.

In this deaeration process, for example, an auxiliary lid 5' provided on the lid body 5 is opened, a pipe 7 is connected, and a vacuum pump 8 is attached to the pipe 7 to draw air into the inside of the frame member 1.

This degassing process can achieve its intended purpose when the inside of the frame material 1 reaches a degree of vacuum of about 50 mmHg.

When this degassing process is completed, remove the vacuum pump 8 attached to the pipe 7 and connect it to the plastic monomer tank 9.
The monomer in the tank 9 is supplied to the hollow part 3.

The amount of monomer supplied is 3 to 8% by weight based on concrete.
If the amount is too small, the minute voids in the concrete will not be filled, and if it is too large, it will cause economic loss.

After the monomer is supplied to the hollow portion as described above, pressure is applied to impregnate the monomer into the microscopic voids of the concrete.

As a pressurizing method, a compressor is connected to the pipe 7 to pressurize the inside of the frame member 1.

Once the monomer is impregnated into the microscopic voids of concrete,
The concrete is heated to polymerize the monomers.

In this case, the heating method may be to connect a circulation pipe 10 to each lid body 5 and circulate hot water in the hollow part 3, or to perform heat treatment from the outside.

Alternatively, heating may be performed using high frequency.

As mentioned above, when concrete is heated, the monomer impregnated in the microscopic voids polymerizes and becomes a polymer, which adheres to the concrete components.

Therefore, concrete products have significantly increased compressive strength and bending strength due to polymers, and also exhibit excellent freeze-thaw resistance and chemical resistance.

Although the concrete product is generally one with the frame material 1 removed, it may also be used as an X-composite pile with the frame material 1 attached.

As is clear from the above, according to the present invention, concrete is poured into a sealed frame material that can withstand high temperatures and high pressures so that it has a hollow part, and then heated and cured, and once the concrete has sufficiently cured and developed strength, the frame material is removed. The interior is degassed, a monomer is supplied to the hollow part, pressure is applied to the inside of the frame material, and once the monomer impregnates the microscopic voids of the concrete, it is heated and polymerized.

Therefore, since the frame material can be used as a container during deaeration, monomer impregnation, and thermal polymerization treatments, extremely large polymer-impregnated concrete products can be manufactured easily and with inexpensive equipment.

Furthermore, if the frame material is sealed and heated to over 100℃, the inside of the frame material becomes high temperature and high pressure, curing the concrete and significantly increasing its strength.Furthermore, the interaction with the polymer creates an ultra-high strength polymer. It becomes an impregnated concrete product.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway perspective view showing an embodiment of the frame material used in the present invention, and FIG. 2 is a schematic system diagram of the present invention.

Claims (1)

[Scope of Claims] 1. Concrete is poured into a sealed frame material that can withstand high temperatures and high pressures so that it has a hollow part, and the concrete is heated and cured. Once the concrete has sufficiently cured and developed strength, the inside of the frame material is poured. Manufacture of a polymer-impregnated concrete product characterized in that the monomer is supplied into the hollow part by deaerating the concrete, the monomer is impregnated into the microscopic voids of the concrete by applying pressure inside the frame material, and then heated and polymerized. Law. 2 Heat curing of concrete at 100℃ with the frame material sealed.
2. A method for producing a polymer-impregnated concrete product according to claim 1, characterized in that the product is heated to a temperature higher than 100%.