JP2011057481A - Quick-setting material for grouting material and quick setting grouting material using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a quick-setting grouting material containing a quick setting component capable of setting for an arbitrary short time of 5-60 min after grouting and permeating even into ground or baserock having small permeability coefficient and excellent in the strength development of a grouting body. <P>SOLUTION: A quick-setting material contains calcium aluminate powder, gypsum, a setting modifier and Portland cement fine powder contains ≥9 wt.% C<SB>3</SB>A and has ≥10,000 cm<SP>2</SP>/g Blaine specific surface area and 12 μm maximum particle diameter. The quick-setting grouting material is prepared by mixing cement milk obtained by adding blast furnace fine powder, an alkaline stimulant, a dispersant and water into the quick setting material slurry and has ≥45 cm grouting depth to a sand filling layer having 10×10<SP>-3</SP>-10×10<SP>-2</SP>cm/sec permeability coefficient. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a quick-curing material for an injection material, and an ultrafast hardening injection material using the same. Specifically, it can be injected into ground and bedrock such as cracks in dams such as tunnels, dams, and reservoirs, dam body foundation rocks, manholes and other leaked parts, and can be used for injection materials with ultra-fast hardness that can stop water. About hardened material and fast-curing injectable material using the same, it hardens in any short time from 5 to 60 minutes after injection, and penetrates well into the ground and rocks with low hydraulic conductivity, and the strength of the injected body The present invention also relates to a good fast-curing material and a fast-hardening injecting material using the same.

Water-stopping work is carried out by injecting fast-hardening materials into soft places such as the ground and bedrock and water leaking places. Conventionally, the following injection materials are known as this quick-hardening injection material.

(A) A ground injection material by two-component mixing of a rapid hardening slurry (calcium aluminate, gypsum, a setting regulator) and a non-quick hardening slurry (cement, slag) is known (Japanese Patent Laid-Open No. 2006-16453).
(B) A soil-stabilizing chemical solution using a mixture of a hydraulic slurry excluding alumina cement (liquid A) and a quick-hardening material liquid (liquid B) made of alumina cement and gypsum is known (Japanese Patent Laid-Open No. 07-118635). Publication).

However, both the above-mentioned ground injecting material (a) and ground injecting chemical solution (b) have a large permeability coefficient (for example, a permeability coefficient of 10 × 10 ⁻² cm) when pressed into the ground at a pressure of 0.1 MPa, for example. However, there is a problem in that it cannot be injected into a narrow gap of 500 μm or less in the rock, although it shows good permeability at lower than (second / second).

(C) Fine powder water in which a dispersant and water are mixed with a fine powder of a hydraulic material whose main component is a fine powder of blast furnace slag having a maximum particle size of 12 μm or less or a Blaine specific surface area of 10000 to 20000 cm ² / g Hard material slurry (A), calcium aluminate composition having a maximum particle size of 45 μm or less and an 85% particle size of 25 μm or less, gypsum, calcium hydroxide, one or more of calcium oxide, and a coagulation modifier There is known an ultra-fast hard mold injection material in which two liquids of an ultra-fast hard admixture slurry (B) obtained by kneading an ultra-fast hard admixture mixed with water at the start of injection (Japanese Patent Laid-Open No. 2001-234167).

The above super-hard mold injection material has the advantage that the gel time can be controlled within 10 minutes, but the strength after curing is low, and the uniaxial compressive strength at the age of 7 days and 28 days is the injection of ultrafine cement. The uniaxial compressive strength of the sand gel is less than 1 N / mm ² at the age of 28 days.

JP 2006-16453 A JP 07-118635 A JP 2001-234167 A

The present invention solves the above-mentioned conventional problems in a fast-curing injecting material, and is cured in an arbitrary short time of 5 to 60 minutes after injection and has a low permeability coefficient (for example, a permeability coefficient of 10 × ^10-2 cm / second) and a fast-curing injection material that penetrates well into cracks in fine rocks and has good strength development of the injected body.

The present invention relates to a fast-curing material that has solved the above problems by having the following configuration, and a fast-curing injection material using the same.
[1] Calcium aluminate powder, gypsum, setting modifier, and Portland cement, the Portland cement having a C ₃ A content of 9% by weight or more, a Blaine specific surface area of 10,000 cm ² / g or more, and a maximum particle size of 12 μm A fast-curing material characterized by being a fine powder.
[2] Portland cement fine powder (C ₃ A content 9 mass% or more, Blaine specific surface area 10000 cm ² / g or more, maximum particle size with respect to 100 parts by weight of the total amount of calcium aluminate powder, gypsum and setting modifier The fast-curing material according to the above [1], wherein the content of 12 μm) is 50 to 400 parts by weight.
[3] A curing accelerating slurry obtained by mixing 100 to 1000 parts by weight of water with 100 parts by weight of the fast curing material described in [1] or [2] above, a blast furnace slag fine powder, an alkali stimulant, And a fast-curing injection material obtained by mixing cement milk obtained by adding water to a dispersant.
In fast cure the injection material described in [4] above [3], a Portland cement powder cement milk C ₃ A is A content 9 wt% or more Blaine specific surface area of 10000 cm ² / g or more and a maximum particle size of 12μm Contains quick-hardening injection material.
[5] The fast-curing injection material according to [4], wherein the Portland cement fine powder content of the cement milk is 10 parts by weight or less with respect to 100 parts by weight of the blast furnace slag fine powder.
[6] The above-mentioned injection depth is 45 cm or more when injected at a pressure of 0.1 MPa into a sand packed bed having a water permeability of 10 × 10 ⁻³ cm / sec to 10 × 10 ⁻² cm / sec [ 3]-The fast-hardening injecting material according to any one of [5] above.
[7] The fast-hardening injection material according to any one of [3] to [6] above, wherein the uniaxial compressive strength at a material age of 7 days is 1 N / mm ² or more for a hardened portion of the injected ground.

In the fast-curing injection material of the present invention, a part of the calcium aluminate, which is a fast-curing component, is substituted with a fine powder of Portland cement having a maximum particle size of 12 μm. It is possible to inject deeply into small grounds and fine cracks in rocks.

Conventional injection materials are mainly composed of calcium aluminate and gypsum as fast-hardening components. In general, calcium aluminate-based clinker represented by 12CaO.7Al ₂ O ₃ [C ₁₂ A ₇ ] and CaO.Al ₂ O ₃ [CA] is hard, so it is difficult to reduce the particle size to a maximum particle size of 25 μm or less. . For this reason, in the particle size distribution of the suspended solids in the injecting material slurry, the ratio of the particle size of 25 μm or more is increased, which causes the impediment to the cracking of the ground with a small hydraulic conductivity and fine rock mass. ing.

On the other hand, in the fast-curing material of the present invention, part of C ₁₂ A ₇ or CA calcium aluminate is replaced with fine Portland cement powder having a maximum particle size of 12 μm. In the distribution, the ratio of particle diameters of 25 μm or more becomes small, and the injection property against cracks in the ground having a low water permeability coefficient or fine rock can be improved. Specifically, for example, when a sand filling layer having a water permeability of 10 × 10 ⁻³ cm / second to 10 × 10 ⁻² cm / second is injected at a pressure of 0.1 MPa, the injection depth is 45 cm or more. It is.

In addition, since the Portland cement fine powder contained in the rapid-curing material of the present invention has a C ₃ A content of 9% by weight or more, the activity is increased by the pulverization and the hardening strength of the injection portion can be improved.

Explanatory drawing which shows the measuring method of the injection depth of a quick-hardening injection material

Hereinafter, the present invention will be specifically described based on embodiments.
The fast-curing material of the present invention comprises calcium aluminate powder, gypsum, setting modifier, and Portland cement fine powder, and the Portland cement has a C ₃ A content of 9% by weight or more and has a maximum particle size of 12 μm. It is characterized by being.

As the calcium aluminate contained in the fast-curing material of the present invention, C ₁₂ A ₇ , CA, or a mixture thereof can be used. The calcium aluminate is preferably a powder having a specific surface area of 4000 cm ² / g or more and a maximum particle size of 25 μm or less.

The gypsum contained in the fast-curing material of the present invention is preferably anhydrous gypsum, and is preferably a fine powder having a Blaine specific surface area of 10,000 cm ² / g or more and a maximum particle size of 11 μm or less.

The setting modifier contained in the fast-curing material of the present invention uses an alkali metal salt or alkaline earth metal salt such as sodium carbonate, sodium sulfate, sodium aluminate, sodium citrate, lithium carbonate, calcium formate as an alkali stimulant. As a retarder, one or a mixture of oxycarboxylic acids such as tartaric acid, gluconic acid and citric acid can be used. For example, an equivalent mixture of sodium carbonate and tartaric acid can be used.

The fast-curing material of the present invention contains Portland cement fine powder. The Portland cement fine powder is a fine powder having a C ₃ A content of 9% by weight or more, a Blaine specific surface area of 10,000 cm ² / g or more, and a maximum particle size of 12 μm. Specifically, for example, early strong Portland cement having a C ₃ A content of 11.5% by weight, a Blaine specific surface area of 10500 cm ² / g, and a maximum particle size of 12 μm is used.

In the quick-curing material of the present invention, the content of each component is preferably 50 to 200 parts by weight of gypsum and 10 to 40 parts by weight of the setting modifier with respect to 100 parts by weight of calcium aluminate. The content of the Portland cement fine powder is preferably 50 to 400 parts by weight with respect to 100 parts by weight of the total amount of calcium aluminate powder, gypsum, and setting modifier.

The quick-hardening injecting material of the present invention comprises a hardening accelerating slurry obtained by mixing 100 to 1000 parts by weight of water with 100 parts by weight of the fast-curing material and cement milk mainly composed of blast furnace slag fine powder. It will be. The blast furnace slag fine powder preferably has a Blaine specific surface area of 10000 cm ² / g or more and a maximum particle size of 10 μm.

Cement milk contains an alkali stimulant, a dispersant, and water along with blast furnace slag fine powder. Sodium carbonate, sodium sulfate, etc. can be used as the alkali stimulant. As the dispersant, commonly used naphthalene sulfonate, lignin sulfonic acid, melamine sulfonic acid and the like can be used.

In the cement milk, the content of each component is preferably 1 to 10 parts by weight for the alkali stimulant and 0.1 to 10 parts by weight for the dispersant with respect to 100 parts by weight of the blast furnace slag fine powder.

Cement milk is made of Portland cement fine powder, which is the main component of the fast-curing material, together with fine powder of blast furnace slag, alkali stimulant, and dispersant (C ₃ A content of 9% by weight or more, Blaine specific surface area of 10,000 cm ² / g. As described above, a small amount of the maximum particle size of 12 μm) can be contained. The content of the Portland cement fine powder is preferably 10 parts by weight or less with respect to 100 parts by weight of the blast furnace slag fine powder. When the Portland cement fine powder content in the cement milk is too large, the injection depth of the quick-hardening injecting material tends not to increase.

The cement milk is preferably prepared by mixing 100 to 1000 parts by weight of water with 100 parts by weight of the total amount of powder such as blast furnace slag fine powder and Portland cement fine powder in consideration of required permeability and strength.

Examples of the present invention are shown below together with comparative examples. The materials used are shown below.
(A) Blast furnace slag fine powder (Sumikin Kashima mineralized product, Blaine specific surface area 11500cm ² / g, maximum particle size 10μm)
(B) Early strong Portland cement fine powder (Mitsubishi Materials Corporation), the following C ₃ A content, Blaine specific surface area and maximum particle size were used.
(B-a) C ₃ A = 11.5%, Blaine specific surface area 10500 cm ² / g, maximum particle size 12 μm
(B-b) C ₃ A = 10.6%, Blaine specific surface area 10500 cm ² / g, maximum particle size 12 μm
(B-c) C ₃ A = 9.2%, Blaine specific surface area 10500 cm ² / g, maximum particle size 12 μm
(Bd) C ₃ A = 8.5%, Blaine specific surface area 10500 cm ² / g, maximum particle size 12 μm
(C) Ultra fine coal cal (Ryoko Lime Industrial Product, Blaine specific surface area 12100 cm ² / g, maximum particle size 10 μm)
(D) Alkali stimulant: Sodium sulfate (Fujibo product, anhydrous neutral sodium sulfate)
(E) Dispersant (Kao Corporation product, Mighty 150R, naphthalene sulfonate)
(F) Water (tap water)
(G) C ₁₂ A ₇ ground product (Mitsubishi Materials product, Blaine specific surface area 4850 cm ² / g, maximum particle size 25 μm)
(H) Anhydrous gypsum pulverized product (Mitsubishi Materials product, Blaine specific surface area 10800 cm ² / g, maximum particle size 11 μm)
(I) Setting controller (sodium carbonate: tartaric acid = 1: 1)

Main cement milks (A-1) to (A-3) were prepared according to the weight ratio shown in Table 1. Curing acceleration slurries (B-1) to (B-8) were prepared according to the weight ratio shown in Table 2. Cement milk (A-3) and curing accelerating slurries (B-8) to (B-11) are comparative products.

A fast-curing injection material is prepared by mixing the hardening milk slurry (B-1) to (B-11) at a ratio of 3: 1 to the main material cement milk (A-1) to (A-3). did. Table 3 shows the types of the mixed cement milk and the type of hardening accelerating slurry. Table 3 shows the pot life, gel time, and injectability. In the examples, the water / binder ratio of the cement milk and the curing accelerating slurry is described mainly at 400%, but any water / binder ratio is 100 to 1000% in accordance with the permeability and strength properties. It can be adjusted within the range.

The quick-hardening injection material shown in Table 3 was injected at a pressure of 0.1 MPa into a sand-filled layer adjusted to a water permeability of 10 × 10 ⁻³ cm / sec, and the injection depth was measured. The outline of the test equipment is shown in the figure. Table 3 shows the homogel strength and sand gel strength (corresponding to the strength of the injection-cured portion) of the fast-curing injection material.

The measuring method of pot life, gel time, injectability, homogel strength and sand gel strength is shown below.
[Usable time] The viscosity of cement milk was measured with a B-type viscometer, and the time until the viscosity reached 10 mPa · s was defined as the usable time.
[Gel time] The viscosity of cement milk was measured with a B-type viscometer, and the time for the viscosity to reach 60 mPa · s was defined as the pot life.
[Injectability] The injection depth of the fast-curing injection material was measured according to an example of a method for determining permeability by measuring the penetration distance of a suspension type chemical solution (Japan Chemical Injection Association). In the test, as shown in FIG. 1, a fast-hardening injecting material was injected from the lower part of the sand-filled layer whose water permeability was adjusted to 10 × 10 ⁻³ cm / sec, and the injection depth was measured.
[Homogel strength] A fast-curing injection material is put into a polyethylene bag with the lower end of a diameter of 5 cm and a length of 100 cm, taken out at a material age of 7 days and a material age of 28 days, and the cured product is cut into a length of 10 cm. Compressive strength was measured in accordance with (JIS A 1216 “Soil uniaxial compression test method”), and this measured value was defined as homogel strength.
[Sand gel strength] From the sand-filled layer used for the injectability test, the portion where the injected material penetrated at the age of 7 days is taken out, and the compressive strength is measured in accordance with the standard (JIS A 1216 "Soil uniaxial compression test method") The measured value was taken as the sand gel strength.

As shown in Table 3, Examples 1 to 8 of the present invention have sufficient pot life and gel time, and each has an injection depth of 45 cm or more with respect to the ground having a small hydraulic conductivity. Have achieved. On the other hand, the pot life and gel time of Comparative Examples 1 to 5 are about the same as those of Examples 1 to 8, but the injection depth is 28 cm or less, and the injectability to the ground having a small water permeability coefficient is remarkably small. In Comparative Example 5, since the amount of cement contained in the cement milk is too large, the injection depth is only 28 cm even when combined with the fast-curing material of the present invention.

Moreover, as for the intensity | strength of a sand gel, all of Examples 1-8 are 1 N / mm < ² > or more in uniaxial compressive strength in age 7 days, and Examples 7-8 are around ² N / mm <2>, and big compressive strength have. On the other hand, Comparative Examples 1 to 6 are all 1 N / mm ² or less, Comparative Examples 2 to 4 are 0.6 N / mm ² or less, and the compressive strength is remarkably small.

Table 4 shows the penetrability and the strength properties of the sand gel when the water / binder ratio of the cement milk and the hardening accelerating slurry is changed. Cement milk having a water / binder ratio of 100% and 1000% based on the formulation (A-2) in Table 1 was used. As the hardening accelerating component milk, those having a water / binder ratio of 100% and 1000% based on (Formulation B-1) in Table 2 were used. When the water / binder ratio was 100%, the sand gel strength was high, while when the water / binder ratio was 1000%, the injection depth was long.

Claims (7)

A fine powder comprising calcium aluminate powder, gypsum, a setting modifier, and Portland cement, the Portland cement having a C ₃ A content of 9% by weight or more, a Blaine specific surface area of 10,000 cm ² / g or more, and a maximum particle size of 12 μm A fast-curing material characterized in that Portland cement fine powder (C ₃ A content 9 mass% or more, Blaine specific surface area 10000 cm ² / g or more, maximum particle size 12 μm) with respect to 100 parts by weight of the total amount of calcium aluminate powder, gypsum and setting modifier The fast-curing material according to claim 1, wherein the content of is a 50 to 400 weight part. A curing accelerating slurry obtained by mixing 100 to 1000 parts by weight of water with 100 parts by weight of the fast curing material according to claim 1 or claim 2, water for blast furnace slag fine powder, alkaline stimulant, and dispersant. A quick-hardening injection material that is mixed with cement milk. The fast-curing injection material according to claim 3, wherein the cement milk contains Portland cement fine powder having a C ₃ A content of 9% by weight or more, a Blaine specific surface area of 10,000 cm ² / g or more and a maximum particle size of 12 µm. Injection material. The fast-curing injection material according to claim 4, wherein the Portland cement fine powder content of the cement milk is 10 parts by weight or less with respect to 100 parts by weight of the blast furnace slag fine powder. 3. The injection depth when injecting at a pressure of 0.1 MPa to a sand packed bed having a water permeability of 10 × 10 ⁻³ cm / sec to 10 × 10 ⁻² cm / sec is 45 cm or more. Item 6. The quick-hardening injecting material according to any one of items 5. The fast-curing injection material according to any one of claims 3 to 6, wherein a uniaxial compressive strength at a material age of 7 days is 1 N / mm ² or more for a hardened portion of the injection ground.

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