JPS588417B2 - Solidification method of gas phase-solid phase composite material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for solidifying a gas phase-solid phase composite material. In particular, an anionic activator and a fine-grained silica solution are infiltrated in advance into a gas phase-solid phase composite material, which consists mostly of hydrophobic substances. Cement is originally a hydrophilic substance and cannot penetrate this gas-solid phase composite material. Allow the cement-gypsum paste to penetrate and inject this paste into the composite material. It gives hardness to the whole by solidifying the paste. In other words, the flexible member is modified into a member that has the ability to support the load K.

in general. Civil engineering construction site. for example. During shield construction, a gas phase-solid phase composite material was glued to the back of the segment. When the segment is assembled within the shield tail, the composite material is compressed between the segment and the shield tail plate to prevent muddy water ingress.

As the shield machine moves forward, the composite material that comes out of the shield tail is duplicated to prevent the surface of the ground from falling off.

In this case, the composite material still has its original elasticity. Not enough to support the ground.

Therefore, loosening and subsidence of the ground is inevitable.

Also. The composite materials used in this manner naturally have continuous air bubbles and have the disadvantage that water leakage from the joints of the segments cannot be completely prevented.

This invention thus initially required flexibility. The present invention provides a method for solidifying a gas phase-solid composite material, which does not need to be flexible, but rather needs to be rigid.

Then. The object of this invention is to provide a means for injecting hydrophilic cement or cement-gypsum paste into the structure of a hydrophobic gas-solid composite material. Moreover, the purpose of this invention is to utilize the elasticity of gas phase-solid phase composite materials. It is an object of the present invention to solidify this to form a load-bearing filler material.A further object of the present invention is to provide a gas-solid composite material-cement member suitable for civil engineering work.

That is, in the present invention, as in the illustrated embodiment, an anionic activator and a particulate silica solution are infiltrated into an elastic gas-solid composite material 1 in advance, and then cement or a cement mixture is infiltrated. Gypsum-based paste 2. The present invention relates to a method for solidifying a vapor-solid composite material, characterized in that the vapor-solid composite material is injected into the tissue and then solidified.

This invention combines a gas phase-solid phase composite material family consisting of many hydrophobic substances with a cement consisting of a hydrophilic substance that is essentially different from the gas phase-solid phase composite material family. It is a technology that injects cement and gypsum-based materials.
Therefore. In the composite materials department. By impregnating the anionic activator and the fine granular silica solution in advance into the tissue of the composite material, the anionic activator and the fine granular silica solution are impregnated into the tissue of the composite material, and the wetting effect in the tissue is enhanced. That's to be expected.

The following are the generally well-known gas phase-solid phase composite materials.

Among these materials, members that are integrated as a single solid and have elasticity are suitable as the gas phase-solid phase composite material of the present invention.

As the anionic surfactant used as a wetting agent in this case, it is particularly preferable to use a sulfosuccinate salt (dialkyl sulfosuccinate), which is expected to have a wetting effect rather than a cleaning effect.

This sulfosuccinic acid ester salt has an atomic group of sulfosuccinic acid at the center of the molecule, and is an ester-bonded sulfonate that has been esterified with the carboxylic acid power of this atomic group with various alcohols. becomes.

Then. When this alkyl group R has 06 to C8 carbon atoms.
The permeability is extremely low, and those with a small number of H carbons have a high solubilization property.

In general, when R is C8, ethylhexyl is common, and it is soluble in water and benzene, and stable in hard water and acids.

The sulfosuccinic acid ester salts used in this invention include 2-ethylhexyl sodium sulfosuccinate and n-octyl sodium succinate, and the test results of their solubility and wetting power are shown in Table 2.

Further, the dispersed particles of fine particulate silicic acid (colloidal silica) used are ultrafine particles with a particle size of 10 to 20 mμ, and are a colloidal solution of silicic anhydride using water as a dispersion medium.

in general. What can be treated as a colloidal solution? The particle size of the dispersoid is said to be 1 to 100 mμ.

The fine particulate silicic acid solution used in this invention has a pH of 9.
If it is in the range of 0 to 10.0, it will be stable as long as the dispersion medium water does not evaporate, but if the pH is raised to 10.5 or higher with an alkali such as sodium silicate or caustic soda, or if the pH is raised to 10.5 or higher with an alkali such as sodium silicate or caustic soda, or When salts such as sodium sulfate (sodium sulfate) or other polyvalent metal salts are added, they interfere with and cancel out the negative charge that maintains the stability of colloidal silica, causing the particles to aggregate. and causes gelation.

That is, the electrolyte tends to induce gelation of colloidal silica, and the gelation causes the particles to bond extremely strongly to each other, forming aggregates.

Therefore, a low concentration solution obtained by adding this particulate silicic acid solution to the above-mentioned anionic surfactant and diluting it to an arbitrary ratio can be used for gas phase-solid phase composite materials that are originally hydrophobic, such as plastic foam, rubber foam fibers, etc. It penetrates deeply into the interior of the aggregate, etc., making it easier to inject cement and cement-gypsum paste in the next process.

Various methods for injecting cement and cement-gypsum paste can be considered depending on the embodiment.

Of course. The viscosity of the paste dictates the method of its injection.

Example-1 Polyurethane foam was added to a solution consisting of 10 parts of sodium 2-ethylhexylsulfosuccinate as an anionic activator, 30 parts of fine-particle silica solution (solid content 20%), and 60 parts of water (all percentages by volume). After soaking and drying, a solidifying agent consisting of 90 parts of ordinary Bortland cement, 10 parts of hemihydrate gypsum, and 70 parts of water was injected.

The compressive strength at 1 day of age is as follows.

(i) When polyurethane foam is injected without compression 3.1 kg/cm2 (ii> When polyurethane is compressed to 80% and injected 1 0.0 kg/cm2 Tazoshi compressive strength indicates the strength at 10% strain .

Example 2 A polyurethane foam was immersed in a solution consisting of 10 parts of sodium n-octylsulfosuccinate as an anionic activator, 20 parts of a fine-particle silica solution, and 70 parts of water (all percentages by volume), and dried. Then, 90 parts of ordinary Bolland cement. A solidifying agent consisting of 10 parts of alumina cement and 70 parts of water was injected.

The compressive strength at one week of age is as follows.

(i) When polyurethane foam is injected without being compressed 5.2 kg/cm2 (11) When polyurethane foam is injected with 80% compression 17. okg/cm2 Tazoshi compressive strength indicates the strength at 10% strain.

APPLICATION EXAMPLE FIGS. 1 and 2 show an example in which polyurethane foam is used as the gas phase-solid phase composite material 1, which is impregnated with the above-mentioned wetting agent and applied to shield construction.

In other words. In shield construction. Polyurethane foam 1 is adhered to the back of segment 4, and segment 4 is made by applying hydrophilic treatment to this polyurethane foam. It can be assembled inside Shield Tail 3.

Then. It is compressed by the shield plate 3' of No. 3 to prevent muddy water from entering.

As the shield machine moves forward, the polyurethane foam 1 that has come out of the shield plate 3' of the shield tail 3 returns to its original state, and at the same time, a cement or cement-gypsum paste 2 is applied to the polyurethane foam 1 from the inside of the segment 4 using a press-fitting device 5. Injected into tissue.

This will make the paste. By penetrating into the polyurethane foam 1 and solidifying it, it not only prevents the ground from falling off. Increase overall strength. Subsidence of the ground surface can be prevented without loosening the ground.

It also prevents water from leaking from the joint surfaces of the segments.

[Brief explanation of drawings]

Figure 1 is an explanatory diagram showing the state of the shield work, and Figure 2 is its cross-sectional view. In the figure, 1 is polyurethane foam, which is a gas phase-solid phase composite material, and 2 is cement or cement-gypsum paste.

Claims (1)

[Scope of Claims] 1. An anionic activator and a fine granular silica solution are infiltrated in advance into an elastic gas phase-solid composite material, and then cement or cement-gypsum paste is applied to the composite material. A method for solidifying plastic foam, which is characterized by injecting it into the tissue of the material and then solidifying it. 2. A method for solidifying a vapor-solid composite material according to claim 1, wherein a thermosetting or thermoplastic plastic foam is applied to the vapor-solid composite material. 3. Gas phase-solid phase composite material. A method for solidifying a gas phase-solid composite material according to claim 1, wherein polyurethane foam or polystyrene foam is applied. 4. A method for solidifying a gas phase-solid phase composite material according to claim 1, wherein a rubber foam is applied to the gas phase-solid phase composite material category. 5 Gas phase-solid phase composite materials department. A method for solidifying a gas phase-solid phase composite material according to claim 1, wherein a fiber aggregate is applied.