JP2017075267A - Two-pack type plasticity grout material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a grout material having plasticity (moderate flow value) capable of being injection filled into a gap, a cavity or the like of a foundation constituted by a rock material, a gravel material or the like and excellent long distance force feeding property and capable of exhibiting high compressive strength after filling.SOLUTION: There is provided a two-pack type plasticity grout material consisting of a mixture of a liquid A containing cement, a water reducing agent and hydrated lime and a liquid B containing slag and a coagulant with total content of cement in the liquid A and slag in the liquid B of 800 to 1200 kg per 1 m.SELECTED DRAWING: None

Description

  The present invention relates to a two-component plastic grout material.

  Conventionally, grout materials have been used to fill gaps, cavities, etc. in the ground.

  In particular, gaps, cavities in the ground composed of rock, gravel, etc. (that is, ground with many voids), cavities at the interface between the ground and the structure (including the back of tunnels, etc.), weak ground (When filling and filling as a pretreatment for ground injection method), when filling gaps, etc. with grout material, because the gaps in the ground are large, the grout material tends to deviate, so it is surely filled Is known to be difficult.

  As types of such grout materials, one-component grout materials and two-component grout materials are known. The one-pack type grout material is prepared by mixing mortar at once in a preparation tank. As an example, there is 1: 1 mortar (weight ratio of water and cement: W / C = 50%). However, the 1: 1 mortar has a low flowability of JHS313 flow value of 12 to 18 cm and is 40 m or more by a thin hose such as 1/2 inch (inner diameter 12.7 mm), 3/4 inch (inner diameter 19.0 mm). It is difficult to pump.

  On the other hand, the two-pack type grout material is prepared immediately by plasticizing the two liquids of liquid A and liquid B, separately pumping them, and mixing the two liquids near the inlet (grouting material). Is a fluid state by applying force. Examples of the two-component grout material include non-flowable plastic grout materials obtained by adding a fluid swelling liquid containing montmorillonite clay mineral to fluid mortar (see, for example, Patent Document 1). .

Examples of the two-pack type plastic grout material satisfying both excellent long-distance pumpability and an appropriate flow value include, for example, JETMS manufactured by Sumitomo Osaka Cement Co., Ltd., which is a plastic injection material. The compressive strength is as low as 1 to 5 N / mm ^2, and a high strength comparable to concrete cannot be obtained. On the other hand, as a two-component plastic grout material having a high compressive strength of 24 N / mm ² after filling and satisfying an appropriate flow value, for example, the main material liquid can be pumped, but the plastic material liquid is injected into the inlet. Pfegrout No. 3 manufactured by Nittoku Construction Co., Ltd., which is mixed in the vicinity, can be mentioned, but it does not satisfy excellent long-distance pumpability.

  In order to solve such problems, plasticity (appropriate flow value) and excellent long-distance pumping that can be reliably injected and filled into gaps and cavities in the ground composed of rock material, gravel material, etc. In addition, there is a demand for the development of a grout material that has the properties and exhibits high compressive strength after filling.

Japanese Patent Laid-Open No. 11-124574

  The present invention has plasticity (appropriate flow value) that can be injected and filled into gaps, cavities, etc. in the ground composed of rock material, gravel material, etc. and excellent long-distance pumpability, and filling It aims at providing the grout material which can express high compressive strength later.

  As a result of intensive studies to achieve the above object, the present inventor has obtained a two-component plastic grout material comprising a mixture of a liquid A containing cement, a water reducing agent and slaked lime, and a liquid B containing slag and a flocculant. According to the above, it has been found that the above-mentioned problems can be achieved. The present invention has been further researched and completed.

That is, this invention includes the injection | pouring method of the following two-pack type plastic grout materials and two-pack type plastic grout materials.
1. It consists of a mixture of liquid A containing cement, water reducing agent and slaked lime, and liquid B containing slag and flocculant, and the total content of cement in liquid A and liquid slag in liquid B is 800 to 1200 kg per m ³ . A two-component plastic grout material.
2. Item 2. The two-component plastic grout material according to Item 1, wherein the amount of the water reducing agent in the liquid A is 0.5 to 1.5 kg per 1 m ^{3 of the} liquid A.
3. Item ^3. The two-component plastic grout material according to item 1 or 2, wherein the amount of slaked lime in the liquid A is 0.5 to 20 kg per 1 m ^{3 of the} liquid A.
4). Item 4. The two-part plastic grout material according to any one of Items 1 to ³ , wherein the amount of the flocculant in the B liquid is 4.0 to 8.0 kg per 1 m ^{3 of} the B liquid.
5). Item 5. The two-component plastic grout material according to any one of Items 1 to 4, wherein the mixing ratio of the A solution and the B solution (A solution amount: B solution amount) is 2: 8 to 8: 2.
6). Item 6. The two-part plastic grout material according to any one of Items 1 to 5, wherein the liquid A contains a thickener and the liquid B contains a water reducing agent and a thickener.
7). Item 7. The two-component plastic grout material according to any one of Items 1 to 6, wherein the compressive strength at a material age of 28 days is 24 N / mm ² or more.
8). An injection method for a two-component plastic grout material, wherein the two-component plastic grout material according to any one of Items 1 to 7 is injected and filled into a cavity or a gap at a boundary surface between the ground, a structure, and the ground and the structure. Then, liquid A and liquid B are pumped separately by separate pumps, and a mixture obtained by merging and mixing liquid A and liquid B near the injection port is injected. Injection of a two-component plastic grout material Method.

  According to the two-pack type plastic grout material of the present invention, it becomes possible to inject and fill into gaps, cavities and the like in the ground composed of rock material, gravel material, etc. and excellent long-distance pumping, and high compression after filling It becomes possible to express strength.

It is the figure which showed the time change of the flow value of the grout material obtained in the Example.

  Hereinafter, the two-component plastic grout material of the present invention will be described in detail.

1. Two-pack type plastic grout material The two-pack type plastic grout material of the present invention comprises a mixture of a liquid A containing cement, a water reducing agent and slaked lime, and a liquid B containing slag and a flocculant. And the total content of slag in the B liquid is 800 to 1200 kg per m ³ . By adopting such a configuration, the two-component plastic grout material of the present invention can be easily injected and filled into gaps, cavities, etc. in the ground that are composed of rock materials, gravel materials, etc. It is possible to form a solidified product having excellent plasticity (appropriate flow value) and excellent long-distance pumpability and high compressive strength after filling.

1-1. Liquid A In the two-pack type plastic grout material of the present invention, liquid A contains cement, a water reducing agent, and slaked lime.

<Cement>
In the present invention, examples of the cement include Portland cement, blast furnace cement, and early-strength cement. Among these, Portland cement is preferable from the viewpoint of compressive strength. As these cements, known or commercially available products can be used. Moreover, these cements may be used alone or in combination of two or more.

The amount of the cement in the liquid A is preferably 300 to 700 kg, more preferably 450 to 550 kg per 1 m ^{3 of the} liquid A because the fluidity can be improved and the strength can be increased.

<Water reducing agent>
In the present invention, the fluidity of the grout material can be further improved by using a water reducing agent. As the water reducing agent, for example, a polycarboxylic acid water reducing agent, a melamine water reducing agent, a lignin water reducing agent, or a naphthalenesulfonic acid water reducing agent can be used. Among these, a polycarboxylic acid-based water reducing agent is preferable from the viewpoint that the performance of dispersing cement in the grout material is particularly high, the fluidity can be further improved, and the fluidity can be maintained. As these water reducing agents, known or commercially available products can be used. Moreover, these water reducing agents may be used independently and may be used in combination of 2 or more type.

The amount of the water reducing agent in the A liquid is preferably 0.5 to 1.5 kg, more preferably 0.8 to 1.2 kg per 1 m ³ of the A liquid. By setting it within this range, it is possible to further improve the fluidity and maintain the excellent long-distance pumpability and fluidity.

<Slaked lime>
In the present invention, by using slaked lime (calcium hydroxide), the plasticizing time of the grout material can be shortened. As slaked lime, commercially available JIS standard special number, No. 1 or No. 2 can be used.

The amount of slaked lime in the A liquid is preferably 0.5 to 20 kg, more preferably 8 to 15 kg per 1 m ³ of the A liquid. By setting it within this range, it is possible to shorten the time until plasticity is exhibited.

<Thickener>
In the present invention, a thickener can be included in the liquid A. By using a thickener, sedimentation separation of cement particles can be further suppressed.

  As the thickener, for example, various cellulose ethers such as methylcellulose, hydroxypropylmethylcellulose, hydroxyethylmethylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, and hydroxyethylethylcellulose can be used. Among these, cellulose ethers, particularly water-soluble cellulose ethers are preferable from the viewpoint of further preventing sedimentation and separation of cement particles.

When the thickener is used, the amount of the thickener in the A liquid is preferably 0.01 kg to 0.7 kg, more preferably 0.3 to 0.5 kg per 1 m ³ of the A liquid. By setting it within this range, it becomes easier to prevent sedimentation of cement particles without lowering the pumpability by appropriately adjusting the viscosity of the grout material.

<Water>
In the present invention, the liquid A can contain water. By using water, the fluidity of the grout material can be further improved. Water is not particularly limited, and tap water or the like can be used.

The amount of water is appropriately selected depending on the intended compressive strength and the like, and is not particularly limited as long as the effects of the present invention are not impaired. The amount of water contained in the A liquid is about 306 to 338 kg per 1 m ^{3 of} A liquid. In particular, it is preferable to adjust to be about 317 to 327 kg.

1-2. B liquid In the two-pack type plastic grout material of the present invention, B liquid contains slag and a flocculant.

<Slag>
In the present invention, as the slag, for example, blast furnace slag, steel slag, non-ferrous slag can be used. Among them, blast furnace slag is preferable from the viewpoint of increasing the compressive strength of the grout material. The amount of slag in the B liquid is preferably 425 to 575 kg, more preferably 475 to 525 kg per 1 m ^{3 of} the B liquid in order to further improve the high strength without lowering the fluidity.

<Flocculant>
In the present invention, as the flocculant, for example, sodium aluminate, aluminum sulfate, iron sulfate, slaked lime, polymer flocculant and the like can be used. Among these, sodium aluminate is preferable from the viewpoint of improving the fluidity more appropriately.

The amount of the flocculant in the A liquid is preferably 4.0 to 8.0 kg, more preferably 5.0 to 7.0 kg per 1 m ³ of the A liquid. By setting it within this range, the fluidity can be improved more appropriately.

<Water reducing agent>
In the present invention, a water reducing agent may be included in the B liquid. By using a water reducing agent, it is possible to improve the fluidity more appropriately and further improve the long-distance pumpability and further suppress the material separation. As the water reducing agent, for example, a polycarboxylic acid water reducing agent, a naphthalenesulfonic acid water reducing agent, or a melamine sulfonic acid water reducing agent can be used. Among them, a polycarboxylic acid-based water reducing agent is preferable from the viewpoint of improving fluidity more appropriately and further improving long-distance pumpability and further suppressing material separation.

When the water reducing agent is used, the amount of the water reducing agent in the B liquid is preferably 0.5 to 1.5 kg, more preferably 0.8 to 1.2 kg per 1 m ³ of the B liquid. By setting it within this range, it is possible to improve the fluidity more appropriately to further improve the long-distance pumpability and further suppress the material separation.

<Thickener>
In the present invention, a thickener may be included in the B liquid. By using a thickener, sedimentation separation of cement particles can be further suppressed.

  As the thickener, for example, various cellulose ethers such as methylcellulose, hydroxypropylmethylcellulose, hydroxyethylmethylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, and hydroxyethylethylcellulose can be used. Among these, cellulose ethers, particularly water-soluble cellulose ethers are preferable from the viewpoint of further preventing sedimentation and separation of cement particles.

When using a thickener, the amount of thickener B solution is, B solution 1 m ³ per 0.4~1.0kg are preferred, 0.6～0.8Kg is more preferable. By setting it within this range, the viscosity of the grout material can be appropriately adjusted to further enhance the pumpability.

<Water>
In the present invention, the liquid B can also contain water. By using water, the fluidity of the grout material can be further improved. Water is not particularly limited, and tap water or the like can be used.

The amount of water is appropriately selected depending on the intended compressive strength and the like, and is not particularly limited as long as the effects of the present invention are not impaired, but the amount of water contained in the B liquid is about 273 to 333 kg per 1 m ^{3 of} the B liquid. In particular, it is preferable to adjust so that it may become about 293-323 kg.

1-3. Grout material The grout material of the present invention is a two-component grout material comprising a mixture of a liquid A containing cement, a water reducing agent and slaked lime, and a liquid B containing slag and a flocculant. The total content of cement and slag in the B liquid is 800 to 1200 kg per 1 m ³ , so that it can be easily injected and filled into gaps, cavities, etc. in the ground composed of rock materials, gravel materials, etc. Long-distance pumpability and high compressive strength after filling. When the total content of the cement in the liquid A and the slag in the liquid B is out of the above range, it is difficult to develop a high compressive strength after filling.

In the grout material of the present invention, when the total content of cement in the liquid A and slag in the liquid B is 800 to 1200 kg per 1 m ³ , particularly 1000 to 1100 kg, high compressive strength can be expressed.

  In the grout material of the present invention, the mixing ratio of the liquid A and the liquid B (the amount of the liquid A: the amount of the liquid B) is preferably 4: 6 to 6: 4 (mass ratio), and 1: 1 (mass ratio). Is more preferable.

  In view of the mixing properties of the tip A static mixer of liquid A and liquid B, it is desirable to have the same volume, the same density, and the same viscosity, and it is most desirable to have a composition that satisfies these three conditions.

Grout of the present invention, in order to employ the above configuration, the compressive strength at the age of 28 days 24N / mm ² or more, in particular to ^{24N / mm 2 ~30N / mm 2} . The compressive strength at the age of 28 days means the compressive strength at the age of 28 days of standard underwater curing.

2. Grout material injection method In the grout material injection method of the present invention, first, A liquid and B liquid are respectively pumped by separate pumps, and A liquid and B liquid are merged and mixed in the vicinity of the injection port. Inject the mixture obtained by

  In the grout injection method according to the present invention, it is preferable to first mix the solution A and the solution B using a static mixer such as a static mixer having about 6 elements until they are uniform, and gel the mixture. By using a static mixer, the plasticity and fluidity of the grout material of the present invention can be further improved.

  After mixing the two liquids A and B, the flow value measured by the cylinder method defined in JHS 313 is about 20 to 10 cm × 20 to 10 cm, particularly 18 to 12 cm × 18 to about 1 to 30 seconds. It can be about 12 cm. Thereby, the outstanding filling property can be exhibited.

  In the grouting material injection method of the present invention, the grouting material of the present invention thus obtained is ½ inch (inside diameter 12.7 mm), 3/4 inch (inside diameter 19.0 mm) using an infusion pump. ), Etc., and can be injected into the ground, for example. There is no particular limitation on the method of injecting into the ground, and it can be appropriately selected and adopted from conventional ground improvement methods according to the conditions of the ground such as the ground conditions, the purpose of construction and workability.

  EXAMPLES Hereinafter, although this invention is demonstrated concretely based on an Example, this invention is not limited only to these.

In the examples, the following materials were used.
<Materials used>
・ Cement (ordinary Portland cement)
・ Water reducing agent (polycarboxylic acid water reducing agent)
・ Slaked lime (containing calcium hydroxide)
・ Thickener (water-soluble cellulose ether)
・ Slag (blast furnace slag)
・ Flocculant (sodium aluminate)
・ Water (locally procured tap water).

Examples 500 L of liquid A was prepared by stirring for 10 minutes at 400 rpm using a hand mixer with the composition shown in Table 1 below. Moreover, 500 L of B liquid was prepared by stirring for 10 minutes at 400 rpm using a hand mixer with the composition shown in Table 1.

  First, viscosity evaluation was performed 3 times with the following method about the prepared A liquid and B liquid. The results of viscosity evaluation are shown in Table 2 below.

[Viscosity evaluation by P funnel]
According to the fluidity test shown in JSCE-F521, the flow time (seconds) of the P funnel was measured to evaluate the viscosity.

  Since the A and B liquids are pumped by the proportional pump (product name: SG-40, manufacturer: Shin Meiwa Kogyo Co., Ltd.), the flow of the A and B liquids is about the same based on the result of the viscosity evaluation. did.

  Then, A liquid and B liquid were each pumped by a proportional pump to a 1/2 inch (inner diameter 12.7 mm) hose (length 200 m). And the grout material of this invention was manufactured by mixing A liquid and B liquid in front of an injection pipe using a static mixer (Product name: N60, manufacturer and distributor: Noritake).

  The manufactured grout material of the present invention was evaluated as follows.

Test Example (1) Fluidity Test A flow value was measured according to a flow test shown in the standard (JHS 313) “Cylinder Method of Consistency Test Method”. In the two-pack grout material, the flow value changes depending on the elapsed time after the two liquids are mixed, so the relationship between the elapsed time and the flow value is grasped. The test results are shown in FIG. 1 (change in flow value with time) and Table 3. The static flow was based on the cylinder method of the JHS 313 consistency test method, and the striking flow was also measured to represent the situation where it was press-fitted with a grout pump (force is applied). The striking flow conforms to the JHS R5201 flow test, but was measured using a hard plastic cylinder applied by the cylinder method of the JHS 313 consistency test method instead of the flow cone.

  As shown in Table 3 and FIG. 1, up to 15 seconds after discharge, both the stationary flow and the striking flow are within a range that satisfies the reference value of 12 to 18 cm. In a state where the pump was not press-fitted (stationary), the flow was close to 12 cm and there was no deviation, and when the pump was press-fitted (blow), the flow value approached 18 cm, indicating excellent properties for filling. In addition, even after 300 seconds (5 minutes), the blow flow value was 12 cm, indicating that filling by pump press-fitting is possible. In this experiment, the time from the mixing of the two liquids A and B to the discharge is 330 cm from the static mixer to the discharge port, the inner diameter of the pipe is 2.54 cm, and the flow rate is 6 L / min. = 100 cc / sec, so it was about 16.7 seconds. In addition, the static mixer and the injection pipe are connected by a 1-inch grout hose. By changing the hose length, the time after mixing the two liquids can be adjusted, indicating that flow control is possible. It was.

(2) Fillability test Two types of tests were performed to confirm the fillability: one that created a simulated ground on a steel plate and one that was a wall model. First, the simulated ground created on the iron slag was prepared by packing a steel slab having a diameter of 1.5 m and a height of 1.25 m with grits of 75 mm or more and No. 4 crushed stone in a volume ratio of 1: 1. The filling of the iron iron was performed by connecting a 1/2 inch (inside diameter 12.7 mm) hose to 200 m.

  In the examples, the discharge amount was 7 L / min on average, the recorded meter display pressure was 1.8 MPa at the maximum, and it was confirmed that pumping by a proportional pump was possible. A slight leak was observed during filling, but a standard 70 L was filled. The iron slag was disassembled the day after filling and the resulting shape was confirmed. The grout material of the present invention did not deviate and showed sufficient penetration above the injection tube. This satisfied the range necessary to consolidate the back grinds of 4 Satoshi stones.

  The wall-shaped model was packed with the same ground material with iron iron in a mold having a width of 1.0 m, a height of 1.4 m, a thickness of 0.5 m, and a gradient of 70 °. Moreover, in order to observe the penetration | invasion condition to the back ground, the front was made into the transparent acrylic board. The wall model was filled by connecting a 3/4 inch (inner diameter 19.0 mm) hose to 60 m. The discharge amount was 10 L / min, the recorder display pressure was 0.2 MPa, and 100 L of the grout material of the present invention was injected.

  In the example, the grout material of the present invention does not deviate from the finished shape of the wall model, and a solidified body having a width of 1.0 m and a height of 0.9 m is formed, and good penetration can be confirmed. It was.

(3) Compressive strength test According to the compressive strength test shown in the standard "JIS A 1108", a specimen having a diameter of 50 mm and a height of 100 mm was prepared, and the compressive strength (N / mm ² ) at the age of 28 days was measured. As a result, the compressive strength at the age of 28 days was 27.4 N / mm ² .

It was shown that it is a two-component grout material produced in an example of the present invention, and can be pumped over a long distance of 200 m with a 1/2 inch hose. In addition, it was shown that the static flow and the striking flow are within the standard flow value, so that it has plasticity and that the flow value can be easily controlled by the adjusting hose. Further, it was confirmed that there was no deviation in the filling ability of the back grind and that the permeability for 4 pieces of the stones was sufficiently secured. And since the compressive strength on the age of 28 days is 27.4 N / mm < ² >, it was shown that the high intensity | strength comparable to concrete is obtained.

  The two-component plastic grout material of the present invention has plasticity (appropriate flow value) and long-distance pumpability that can be reliably injected into the ground composed of rock material and gravel material, and high compression. Since it exhibits strength, it can be suitably used in industries related to ground reinforcement.

Claims (8)

It consists of a mixture of liquid A containing cement, water reducing agent and slaked lime, and liquid B containing slag and flocculant, and the total content of cement in the liquid A and slag in the liquid B is 800 to 1 m ³ . A two-part plastic grout material that is 1200 kg. The two-component plastic grout material according to claim 1, wherein the amount of the water reducing agent in the A liquid is 0.5 to 1.5 kg per 1 m ^{3 of} the A liquid. The two-pack type plastic grout material according to claim 1 or 2, wherein the amount of slaked lime in the A liquid is 0.5 to 20 kg per 1 m ^{3 of} the A liquid. The two-component plastic grout material according to any one of claims 1 to 3, wherein an amount of the flocculant in the B liquid is 4.0 to 8.0 kg per 1 m ^{3 of} the B liquid.   The two-component plastic grout material according to any one of claims 1 to 4, wherein a mixing ratio of the liquid A and the liquid B (amount of the liquid A: amount of the liquid B) is 2: 8 to 8: 2. .   The two-part plastic grout material according to any one of claims 1 to 5, wherein the liquid A contains a thickener and the liquid B contains a water reducing agent and a thickener. The two-component plastic grout material according to any one of claims 1 to 6, wherein the compressive strength at a material age of 28 days is 24 N / mm ² or more. A two-part plastic grout material injection method for injecting and filling the two-part plastic grout material according to any one of claims 1 to 7 into the ground, the structure, and the cavity or gap in the boundary surface between the ground and the structure. There,
Two-component plastic grout material in which the liquid A and the liquid B are pumped by separate pumps, and a mixture obtained by merging and mixing the liquid A and the liquid B near the inlet is injected. Injection method.