JP2008024925A - Plastic grout material and method for producing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a plastic grout material which can retain plasticity for a long time, even when further stirred, such as remixing, after plasticized, and enables long distance pressure feed and transportation with containers. <P>SOLUTION: This two liquid type plastic grout material is produced by stirring and mixing cement milk, milk containing slag and slaked lime, milk containing slag, gypsum, and slaked lime, or milk containing slaked lime as a liquid A, with montmorillonite clay mineral milk containing a phosphate as a liquid B. With the phosphate added to the liquid B, the plastic grout material enduring to remixing and ensuring a long plasticity-retaining time is obtained. When the plastic grout material is injected, for example, into the back side of a tunnel covering construction 1, an un-filled area C can approximately perfectly be eliminated, because a plasticity-holding time is long and also because the plasticity is not lost for a long time, when remixed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a plastic grout material comprising cement milk or slaked lime milk and mixed milk thereof, or milk containing slag and slaked lime, and montmorillonite clay mineral milk such as bentonite milk, and a method for producing the same. It is used for backfill injection in tunnels, etc., filling of cavities at the interface between the ground and structures, filling of voids in the ground, and filling of voids inside structures.

  One type of plastic grout material is a two-component type that uses cement milk or liquid bentonite as the liquid A, uses water glass as the liquid B, and mixes them immediately before use to give plasticity to the grout material. Water glass grout materials are known.

  However, this type of plastic grout material has a problem that the gel state and the time for maintaining the plasticity are short, and the initial strength development is hindered by refining.

  Therefore, for example, as described in Patent Document 1, in the case of injecting plastic grout into large gaps or cavities of soft ground, a suspension mainly composed of a hardening developing material as A liquid, and B liquid As shown in the figure, water glass is pumped through separate injection pipes, merged and mixed before the injection port, and a plastic gel is formed and injected before reaching the injection port, and the pumping conditions and merging conditions are strict. Management helps maintain performance.

  In addition, in Patent Document 2, a fluid viscous liquid mainly composed of cement and montmorillonite clay mineral is used as A liquid, and a sulfuric acid sulfuric acid solution solution is used as B liquid. A method is described in which aluminum hydroxide is instantaneously generated by merging and mixing liquid A and liquid B, and a grout transformed into a non-flowable plastic is injected.

  Further, Patent Document 3 is formed by stirring and mixing cement milk as liquid A and bentonite milk as liquid B as a solution for groundwater contamination and durability problems caused by water glass grout materials. Cavity filling, lightweight embankment and landfill plastic injection materials are described.

Japanese Patent No. 2995976 Japanese Patent No. 3561136 Japanese Patent No. 3378501 Japanese Patent Laid-Open No. 2004-075746 Japanese Patent Laid-Open No. 2004-244483

  In order to maintain the performance, the plastic grout materials described in Patent Document 1 and Patent Document 2 must be pumped with liquid A and liquid B using separate injection pipes, and it is necessary to strictly control the conditions of pumping and merging, Furthermore, since the time during which the plastic state can be maintained is as short as about 30 minutes and solidifies early, taking the backfill of the tunnel as an example, as shown in FIG. There are problems such as unfilled areas.

  In the case of a plastic grout material obtained by stirring and mixing cement milk and bentonite milk of Patent Document 3, the kneading time for liquid A and liquid B is preferably about 15 seconds or less with a hand mixer. It is considered undesirable because it tends to cause material separation, and there is a problem in that if the stirring is continued after plastic formation, the plastic state is released and liquefaction occurs.

  The present invention is intended to solve the above-described problems in the prior art, and can retain plasticity for a long time even if stirring is further continued after plastic formation, such as kneading, long-distance feeding, container transportation, etc. It is an object of the present invention to provide a plastic grout material and a method for producing the same.

  The plastic grout material according to claim 1 is obtained by stirring and mixing cement milk as liquid A prepared separately and milk of montmorillonite clay mineral containing phosphate as liquid B.

  The point of using cement milk as the liquid A and the point of using the milk of montmorillonite clay mineral as the liquid B are the same as the invention described in Patent Document 3, and cement and water in the liquid A and various admixtures added as necessary. The concept of the blending of the agent, the blending of the montmorillonite clay mineral and water in the liquid B, and various admixtures added as necessary is basically the same as the invention described in Patent Document 3.

  However, in the case of the invention described in Patent Document 3, since the plasticity is lost due to the reworking as described above, the application condition is a case where the reworking is small. There is no problem because it is close to the site, but it is not so easy when it becomes a railway tunnel that is not so, such as when long-distance pumping is performed.

  On the other hand, the present inventor added a phosphate such as sodium tetrapolyphosphate to the B liquid in the process of repeating the experiment for a plastic grout material that is resistant to repetition and can secure a long plastic holding time. It has been found that the plastic holding time is long, and that the plastic state can be maintained even after refining.

  Thus, according to the plastic grout material of the present invention, long-distance pumping by a pipeline such as a hose (the plastic grout material passing through the inside of the pumping pipe or the hose is in a state of stirring and stirring due to internal resistance, cross-sectional change, bending, etc. Here, the purpose cannot be achieved if it is liquefied without maintaining plasticity), and transportation by container is also possible, which is advantageous in terms of handling in a narrow space.

  The plastic grout material of the present invention can be expected to have a plasticity of about 4 to 20 hours, but this time mainly varies depending on the type of phosphate.

  Examples of the phosphate include primary phosphoric acid, second phosphoric acid, third phosphoric acid, pyrophosphoric acid, acidic pyrophosphoric acid, tripolyphosphoric acid, tetrapolyphosphoric acid, hexametaphosphoric acid, and sodium salt or potassium salt of acidic hexametaphosphoric acid. It can be illustrated.

  Depending on the type of phosphate, it is not only the one that delays curing, but if several different types of phosphate are used in combination, the plastic holding time can be adjusted. In particular, tetrapolyphosphate, hexametaphosphate, and pyrophosphate are suitable for maintaining plasticity for a long period of time, and they can be reconstituted in about 20 hours by appropriately blending them.

  A second aspect of the present invention limits the case where slaked lime is added to the liquid A in the plastic grout material according to the first aspect.

By adding slaked lime to the liquid A, the time until it becomes plastic can be shortened. For example, it is effective when the liquid temperature is low. Conversely, when the liquid temperature is about 16 ° C. or higher, or the cement amount is about 500 kg or more per 1 m ³ , the need for slaked lime is small.

Claim 3 is the plastic grout material according to claim 2, wherein 300 to 600 kg of cement, 1 to 20 kg of slaked lime, 75 to 150 kg of bentonite as a montmorillonite clay mineral, phosphate per 1 m ^{3 of the} liquid A and the liquid B The case where 1-9kg is mix | blended is limited.

  When the amount of cement is less than 300 kg, the strength at the time of curing as a grout material is difficult to obtain, and it is not suitable for applications that require a certain degree of strength. If it exceeds 600 kg, the cost is high, and it is difficult to prepare and manufacture.

  When slaked lime is less than 1 kg, it is difficult to achieve an effect at low temperatures (5 ° C. or less). If it exceeds 20 kg, the effect remains unchanged and uneconomical.

  When bentonite is less than 75 kg, the grout material flows for a long time and plasticity is difficult to stabilize, and when it exceeds 150 kg, stirring and mixing with a mixer becomes difficult.

  When the amount of phosphate is less than 1 kg, the effect is not sufficient, and when the amount is more than 9 kg, the effect does not change. Rather, the time until plastic stability is reached may be prolonged, which is uneconomical.

  A plastic grout material according to claim 4 is obtained by stirring and mixing milk containing slag and slaked lime as separately prepared A liquid and milk of montmorillonite clay mineral containing phosphate as B liquid. It is.

  In claim 4, slag is used instead of cement, but by using slag in combination with slaked lime, it is possible to maintain the plasticity for a long time even if stirring is continued after plastic formation, such as by refining. It is done. The slag is generally blast furnace slag, but is not particularly limited.

  In the case of Claims 1 and 2, which is a combination of cement and phosphate as described above, the time during which the plasticity can be maintained is about 4 to 20 hours, whereas slag and slaked lime are used in combination with the A liquid. However, in the case where this was combined with the phosphate used in the B solution, a test result was obtained in which the plastic holding time capable of being kneaded was further extended by about 5 hours.

Claim 5 is the plastic grout material according to claim 4, wherein 50 to 600 kg of slag, ^{3 to 30} kg of slaked lime, 75 to 150 kg of bentonite as a montmorillonite clay mineral, phosphate per 1 m ³ in total of the liquid A and liquid B The case where 1-9kg is mix | blended is limited.

  Although depending on the blending ratio with other compositions, when the slag is less than 300 kg, the flow value becomes large, the plasticity becomes weak, and the strength is difficult to obtain. If it exceeds 600 kg, the cost is high, and it is difficult to prepare and manufacture.

  A sixth aspect of the present invention limits the case where the slag is gypsum-containing slag containing 1 to 10% by weight of gypsum in the plastic grout material according to the fifth aspect.

  Gypsum has the effect of hardening slag and promoting hardening even at low temperatures. When the amount of gypsum is less than 1% by weight, the effect is poor, and when it is more than 10% by weight, the amount becomes unnecessary for hardening the slag.

  The plastic grout material according to claim 7 stirs separately prepared slaked lime milk as liquid A or low-concentration cement milk containing slaked lime and milk of montmorillonite clay mineral containing phosphate as liquid B. It is a mixture.

  The seventh aspect is intended for a case where the required hardening strength is lower than that of the plastic grout material according to the second aspect, depending on the application. Even if the A liquid contains no cement or the amount of cement is small, the slaked lime milk as a liquid A or a low-concentration cement milk containing slaked lime is combined with the B liquid containing phosphate to recycle. For example, a plastic grout material capable of maintaining the plasticity for a long time even if stirring is continued after the plastic formation is obtained.

Claim 8 is the plastic grout material according to claim 7, wherein 0 to 300 kg of cement, 1 to 20 kg of slaked lime, 75 to 150 kg of bentonite as montmorillonite clay mineral, and phosphate per 1 m ^{3 of the} liquid A and liquid B It is formed by blending 1 to 9 kg.

  Cement 0 kg is the case where the cement A is not contained in the liquid A. When the amount of cement is more than 300 kg, the plastic grout material according to claim 3 can be used, and can be properly used depending on the application and required performance.

  Claim 9 is the plastic grout material according to claims 1 to 8, wherein the phosphate is a sodium salt or potassium of primary phosphoric acid, tripolyphosphoric acid, tetrapolyphosphoric acid, hexametaphosphoric acid, pyrophosphoric acid and acidic hexametaphosphoric acid The case where it is at least one phosphate selected from among salts is limited.

  These are phosphates that have obtained particularly good results in the experiments described below. The reason why at least one kind is used is that several kinds can be used in combination, and the plasticity effect can be adjusted by using them together.

  Claim 10 is a state in which the montmorillonite clay mineral is swollen as a preferable method for producing the plastic grout material according to claims 1 to 9, while a predetermined amount of water is put into a mixer and stirred. Liquid B prepared by mixing phosphate as an aqueous solution in advance is mixed with cement and water, or cement and slaked lime and water, or slag and slaked lime and water, or slag and gypsum and slaked lime and water, or slaked lime and water. The procedure of stirring and mixing in addition to the liquid A thus prepared is limited.

  As a method of making milk of montmorillonite clay mineral such as bentonite milk containing phosphate as the B liquid, montmorillonite clay mineral such as bentonite is added while stirring in a predetermined amount of water. The phosphate is mixed in at or around the time when the montmorillonite clay mineral is added. Preferably, the montmorillonite clay mineral is swelled in a phosphate aqueous solution after giving priority to the swelling of the montmorillonite clay mineral. The liquid limits that case.

  Claim 11 is the method for producing a plastic grout material according to claim 10, wherein the phosphate is a sodium salt of primary phosphoric acid, tripolyphosphoric acid, tetrapolyphosphoric acid, hexametaphosphoric acid, pyrophosphoric acid and acidic hexametaphosphoric acid, or The case is limited to at least one phosphate selected from potassium salts.

  Claim 12 is a method for producing the plastic grout material according to claims 1 to 10, wherein the B liquid prepared by adding montmorillonite clay mineral to water in which phosphate is dissolved and stirring the mixture with a mixer is prepared in advance. Cement and water, or cement and slaked lime and water, or slag and slaked lime and water, or slag and gypsum and slaked lime and water, or a procedure for stirring and mixing in addition to liquid A prepared by mixing slaked lime and water It is.

  When a large amount of montmorillonite clay mineral is blended, adjustment with a mixer is facilitated by dissolving the phosphate first.

  Claim 13 is the method for producing a plastic grout material according to claim 12, wherein the phosphate is selected from sodium or potassium salts of tripolyphosphoric acid, tetrapolyphosphoric acid, hexametaphosphoric acid, and acidic hexametaphosphoric acid. In addition, the case of at least one type of phosphate is limited.

  In the production method of claim 12, the first phosphate and pyrophosphate are not suitable.

  The present invention is a two-component type plastic grout material using cement milk, bentonite milk, or milk containing slag and slaked lime as a main component, in which phosphate is added to montmorillonite clay mineral as B liquid. Compared to conventional plastic grout materials, including the two-component type, it is resistant to re-stripping and can ensure a very long plastic holding time.

  In the present invention, the plasticity is maintained even after repeated refining at the initial stage of plasticization, so that it is possible to carry out long-distance pumping, which was practically impossible with conventional plastic grout materials. It is difficult to use because there is a risk of solidification in the environment.

  In addition, when the container is transported to the site and injected with a pump, etc., it will be repeatedly stirred and stirred, but the plastic grout material of the present invention can maintain the plasticity even in such a case, However, it is very effective when containers are transported because the mixing plant cannot be installed.

  Hereinafter, a case where one embodiment of the present invention is used for backfilling in tunnel construction will be described as an example.

  In the present invention, as in the case of the conventional two-component plastic grout material, the liquid A and the liquid B are prepared separately and used by mixing them.

  When used for backfilling in tunnel construction, for example, liquid A and liquid B are respectively pumped by a pump, and a mixed and mixed solution is injected before the backfilling injection hole. Depending on the construction conditions and composition, it is also possible to mix the A liquid and the B liquid on the ground and then send them into the tunnel to perform backfill injection.

  Table 1 shows a blending example of liquid A and liquid B per 1000 L of grout material when cement milk is used for liquid A.

  The liquid A corresponds to a cement milk added with a predetermined amount of slaked lime, and the slaked lime functions to shorten the plastic start time and stabilize the expression strength.

  B liquid is corresponded to what added the tetrapolyphosphate which is a phosphate to bentonite milk.

  As a preferable preparation method when used for tunnel backfilling, a predetermined amount of water is put into a mixer and bentonite is added while stirring, and an aqueous solution of tetrapolyphosphate is mixed in a state where the bentonite is swollen. adjust. By adjusting in such a procedure, the manufactured grout material gives priority to the swelling property of bentonite and becomes a more stable plasticizer.

  In the above blending, the ratio of the liquid A and the liquid B is 1: 1, and mixing is easy and the operation can be simplified. If the two liquids are not equal in volume, the work such as the use of a proportional pump becomes complicated and the mixing efficiency is not good.

  As described above, when the ratio of the liquid A and the liquid B is 1: 1, for example, when the liquid A is 400 L and the liquid B is 600 L and the proportional injection of 2: 3 is performed, In order to prepare for this, the blending ratio per 1000 L is also displayed, and in the case of proportional injection, each blending may be distributed and adjusted.

  FIG. 1 shows the advantages of using the plastic grout material of the present invention in comparison with the case of using the conventional plastic grout material of FIG.

  For example, when a conventional plastic grout material is used, backfilling itself can be performed taking advantage of its plasticity. However, after filling, there is a risk of liquefaction if it is kneaded or stirred in an uncured state, and plasticity is lost early and curing begins.

  Therefore, as shown in FIG. 2, for example, an unfilled area C is likely to occur between the previous filling area A (for example, the filling area on the previous day) and the next filling area B (for example, the filling area on the current day). There is a problem that it is difficult to confirm.

  On the other hand, the plastic grout material according to the present invention has a long plastic holding time and does not lose its plasticity for a long time even when it is kneaded, so there is little possibility of generating an unfilled region C. For example, FIG. Thus, it is possible to almost completely prevent the occurrence of the unfilled area by filling the same day from the same injection hole 2 provided in the tunnel lining 1 with the unfilled area A of the previous day being uncured. is there.

  Table 2 shows a typical blending example of liquid A and liquid B per 1000 L of grout material when milk containing slag and slaked lime is used as liquid A.

  Table 3 shows a typical blending example of liquid A and liquid B per 1000 L of grout material when milk containing gypsum-containing slag and slaked lime is used as liquid A.

   Details regarding these formulations are given in the examples.

[Experiment 1]
Without changing the blending of liquid A and the amount of bentonite and water in liquid B, 7 types of phosphates were each made into 6 kg aqueous solutions and mixed into bentonite milk, and the plasticizing time and expression strength were confirmed. Table 4 shows the formulation and Table 5 shows the experimental results.

Cement: Ordinary Portland cement (Tokuyama Corporation)
Slaked lime: Slaked lime (Ryoko Lime Industry Co., Ltd.)
Bentonite: Bentonite (250 mesh) (Hoyo Bentonite Mining Co., Ltd.)
Phosphate A: Sodium tripolyphosphate (Shimonoseki Mitsui Chemicals)
Phosphate B: Sodium hexametaphosphate (Yoneyama Chemical Co., Ltd.)
Phosphate C: Sodium tetrapolyphosphate (Rin Chemical Industry Co., Ltd.)
Phosphate D: Sodium pyrophosphate (Lasa Soei Co., Ltd.)
Phosphate E: Potassium pyrophosphate (Lasa Soei Co., Ltd.)
Phosphate F: Tribasic sodium phosphate (Lasa Soei Co., Ltd.)
Phosphate G: dibasic sodium phosphate (Lasa Soei Co., Ltd.)

Experiment 1 revealed the following.
(1) Judging from the flow value, those not containing phosphoric acid as a comparative example are not suitable because of low plasticity.
(2) 6 kg of phosphate B (sodium hexametaphosphate) is inappropriate from the viewpoint of plastic initiation and plastic stabilization time. However, this result is because the blending amount of 6 kg is too large, and good results have been obtained by suppressing the blending amount in other experiments.
(3) There is a problem that phosphate D is difficult to dissolve in water.
(4) When phosphate F (tribasic sodium phosphate) and phosphate G (secondary sodium phosphate) are mixed, the viscosity of the B liquid bentonite increases, and there is a slight problem in the mixing operation.
(5) For phosphate E (potassium pyrophosphate), good values were obtained for the flow value, plasticity initiation, and plastic stabilization time. However, the product cost is the highest.

[Experiment 2]
Simultaneously with Experiment 1, when 6 kg of phosphate C (sodium tetrapolyphosphate) was blended, an experiment of repeated re-kneading (an experiment for confirming that plasticity was maintained after re-kneading) was performed. The formulation and experimental results are shown in Table 6.

Experiment 2 revealed the following.
(1) A mixture of phosphate C (sodium tetrapolyphosphate) is remixed every 6 hours after the first mixing, and the change in flow value and strength was measured, but it was not remixed. I confirmed that there was no big difference.
(2) It was found that even during reworking work, the plastic state equivalent to the initial state was maintained and unchanged.
(3) The uniaxial compressive strength is about twice as much in 1 week than in 4 weeks, and is not different from the normal tendency.

[Experiment 3]
As Experiment 3, the amount of phosphate C (sodium tetrapolyphosphate) was changed and the flow value and strength were confirmed. The formulation and experimental results are shown in Table 7.

From Experiment 3, the following was found.
(1) When 0 to 1 kg of phosphate is blended per m ^{3, the} plastic start time and plastic stabilization time are fast and good, but the flow value is large and the rise strength of plastic is insufficient.
(2) When 6 kg of phosphate is added per m ^3, both the plastic start time and plastic stabilization time are slightly longer, and is suitable for places where injection distance with a single hose is required after mixing both A and B liquids. .
(3) When 7 kg of phosphate is blended per m ^{3, the} plastic start time and plastic stabilization time are considerably long, so after mixing both liquids A and B, bring them into a tunnel or other facility and inject them as one liquid. Suitable for work.
(4) When phosphate is increased in order of 3 kg, 4 kg, and 5 kg, the flow value does not change much, but the plastic stabilization time tends to gradually increase.

[Experiment 4]
As Experiment 4, a preferred amount of slaked lime was obtained by blending with bentonite and phosphate C (sodium tetrapolyphosphate) using blast furnace cement type B. The formulation and experimental results are shown in Table 8.

  Cement: Blast furnace cement type B (Tokuyama Corporation)

From Experiment 4, the following was found.
(1) Even when the liquid temperature is 18 to 20 ° C., when no slaked lime is added, it is preferable to add slaked lime because it takes a long plastic stabilization time.
(2) If the cement composition is dropped, the plastic stabilization time cannot be shortened unless the slaked lime composition is increased.

[Experiment 5]
As Experiment 5, the slag containing gypsum and slaked lime milk was used as the A liquid, and the bentonite milk was prepared by using 9 kinds of phosphates in an aqueous solution of 3 kg each without changing the blending and the amount of bentonite and water in the B liquid. The plasticizing time and expression strength were confirmed. Table 9 shows the composition and Table 10 shows the experimental results.

Slag: (Sumikin Mineral Co., Ltd.)
Slag with gypsum: (Sumikin Mineral Co., Ltd.)
Slaked lime: Slaked lime (Ryoko Lime Industry Co., Ltd.)
Bentonite: Bentonite (250 mesh) (Hoyo Bentonite Mining Co., Ltd.)
Phosphate a: sodium tripolyphosphate (Shimonoseki Mitsui Chemicals)
Phosphate b: Sodium hexametaphosphate (Yoneyama Chemical Co., Ltd.)
Phosphate c: Sodium tetrapolyphosphate (Rin Chemical Industry Co., Ltd.)
Phosphate d: Ultrapolyphosphate sodium (Kanto Chemical Co., Inc. (reagent))
Phosphate e: Sodium pyrophosphate (Lasa Soei Co., Ltd.)
Phosphate f: Potassium pyrophosphate (Lhasa Soei Co., Ltd.)
Phosphate g: Tribasic sodium phosphate (Lasa Soei Co., Ltd.)
Phosphate h: dibasic sodium phosphate (Lasa Soei Co., Ltd.)
Phosphate i: monobasic sodium phosphate (Lasa Soei Co., Ltd.)

From Experiment 5, the following was found.
(1) All flow values were within 150mm at low temperature (curing temperature 9 ℃ or less).
(2) Uniaxial compressive strength was ^2.5 N / mm ² or more, and good results were obtained.
(3) Stable hardening was obtained at low temperatures by adding gypsum to the slag.
(4) There is a problem that phosphate e is difficult to dissolve in water.
(5) When the phosphates g and h are mixed, the viscosity of the B liquid bentonite increases, which causes some problems in the kneading work.

[Experiment 6]
As Experiment 6, the addition amount of slaked lime was calculated | required by the mixing | blending which used the slag containing gypsum and slaked lime for A liquid, and used bentonite and hexametaphosphate for B liquid. The formulation and experimental results are shown in Table 11.

From Experiment 6, the following was found.
(1) The upper limit of slaked lime was found to be 30kg.
(2) The plastic holding time is about 15 to 20 hours.
(3) Slag mixed with gypsum has a shorter retention time due to the self-hardening of gypsum.

[Experiment 7]
As Experiment 7, a preferable addition amount of gypsum-containing slag was obtained by using gypsum-containing slag and slaked lime for the A-liquid and bentonite and hexametaphosphate for the B-liquid. The formulation and experimental results are shown in Table 12.

Experiment 7 revealed the following.
(1) When the amount of slag containing gypsum is 200 kg or 300 kg, the flow value is large, and the strength is not sufficient at 200 kg. These can be used as a material having small strength and fluidity by changing the application.
(2) By reducing the amount of slag and increasing the flow value, it can also be used in formulations that do not require plasticity.

It is sectional drawing which showed notionally the advantage at the time of using the plastic grout material of this invention for the backfill filling of a tunnel. It is sectional drawing which showed notionally the case where the conventional plastic grout material is used for backfilling of a tunnel.

Explanation of symbols

A: Previously filled area, B: Next filled area, C: Unfilled area,
1 ... Tunnel lining, 2 ... Injection hole

Claims (13)

  A plastic grout material obtained by stirring and mixing cement milk as liquid A prepared separately and milk of montmorillonite clay mineral containing phosphate as liquid B.   The plastic grout material according to claim 1, wherein slaked lime is added to the liquid A. The plastic grout according to claim 2, comprising 300 to 600 kg of cement, 1 to 20 kg of slaked lime, 75 to 150 kg of bentonite as a montmorillonite clay mineral, and 1 to 9 kg of phosphate per 1 m ³ of the total of the A liquid and B liquid. Wood.   A plastic grout material obtained by stirring and mixing milk containing slag and slaked lime prepared separately as liquid A and milk of montmorillonite clay mineral containing phosphate as liquid B. The plastic grout according to claim 4, wherein slag is 50 to 600 kg, slaked lime is ^{3 to 30} kg, bentonite is 75 to 150 kg as montmorillonite clay mineral, and phosphate is 1 to ⁹ kg per 1 m ³ in total of liquid A and liquid B. Wood.   The plastic grout material according to claim 5, wherein the slag is gypsum-containing slag containing 1 to 10% by weight of gypsum.   A plastic grout material obtained by stirring and mixing slaked lime milk as a liquid A or a low-concentration cement milk containing slaked lime prepared separately and a milk of montmorillonite clay mineral containing phosphate as a liquid B. The plastic grout according to claim 7, wherein 0 to 300 kg of cement, 1 to 20 kg of slaked lime, 75 to 150 kg of bentonite as a montmorillonite clay mineral, and 1 to 9 kg of phosphate are mixed per 1 m ^{3 of the} liquid A and B. Wood.   The phosphate is at least one phosphate selected from sodium salt or potassium salt of primary phosphoric acid, tripolyphosphoric acid, tetrapolyphosphoric acid, hexametaphosphoric acid, pyrophosphoric acid, and acidic hexametaphosphoric acid. The plastic grout material according to any one of claims 1 to 8.   A montmorillonite clay mineral was added while mixing with a predetermined amount of water in a mixer, and the B liquid prepared by mixing phosphate as an aqueous solution in a swollen state of the montmorillonite clay mineral was prepared in advance with cement and water, In addition to cement and slaked lime and water, or slag and slaked lime and water, or slag and gypsum and slaked lime and water, or A solution prepared by mixing slaked lime and water, the mixture is stirred and mixed. The manufacturing method of the plastic grout material of description.   The phosphate is at least one phosphate selected from sodium salt or potassium salt of primary phosphoric acid, tripolyphosphoric acid, tetrapolyphosphoric acid, hexametaphosphoric acid, pyrophosphoric acid, and acidic hexametaphosphoric acid. A method for producing a plastic grout material according to claim 10.   B liquid prepared by adding montmorillonite clay mineral to water in which phosphate is dissolved and stirring with a mixer is prepared in advance with cement and water, or cement and slaked lime and water, or slag and slaked lime and water, or slag and gypsum. The method for producing a plastic grout material according to any one of claims 1 to 10, wherein the mixture is stirred and mixed in addition to liquid A prepared by mixing slaked lime and water or slaked lime and water.   The plastic grout material according to claim 12, wherein the phosphate is at least one phosphate selected from sodium salt or potassium salt of tripolyphosphoric acid, tetrapolyphosphoric acid, hexametaphosphoric acid and acidic hexametaphosphoric acid. Manufacturing method.

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