JPH1161126A - Grouting material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a grouting material that has the performance such as gelling time unaffected by the kneading and aging time of the slurry of a hydraulic powdery material, by constituting this grouting material with the liquid A of a specific slurry and a specific liquid B. SOLUTION: This grouting material comprises (A) liquid A prepared by blending 0.05-10 wt.%, based on below powdery material, of at least one hydration inhibitor selected from fluorides, phosphate salts, borate salts, oxycarboxylate salts, dicarboxylic acids, ketocarboxylic acids, sugar alcohols and saccharides to a slurry containing a hydraulic powdery material including cement clinker and/or cement fine powder, blast furnace slag fine powder, and gypsum fine powder as the main component, and (B) liquid B which is preferably a colloid of ultrafine particles with particle sizes of 1-100 μm and mainly comprises a silica sol the solute of which is mainly composed of silica and/or water glass which has preferably 10-60 wt.% SiO2 concentration and the average particle size of 3-50 mμ and the viscosity of <50 cPs at 25 deg.C.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a suspension type ground injection material, and more particularly, to a suspension type ground injection material, which comprises a slurry of hydraulic material powdery material. The present invention relates to a ground injection material whose kneading time hardly affects performance such as gel time.

[0002]

2. Description of the Related Art Ground injection materials are attracting attention as a permanent soil improvement method for the purpose of strengthening and stopping water in rocks such as dam foundations and large underground structures, and countermeasures against liquefaction of sand grounds. . The suspension-type ground injection material uses a suspension-type reaction material, for example, cement powder. Therefore, at present, there are many instantaneous setting types having a very short gel time. Such a ground injection material generally prepares a liquid A composed of a slurry mainly composed of a powder material having hydraulic properties, and separately prepares a liquid B composed mainly of silica sol or water glass, It is prepared by mixing both immediately before use. There is also known a method of preparing a mixture of the solutions A and B on the spot without separately preparing the solutions A and B.

[0003] In the case of preparing a loose-type ground injection material having a long gel time, the time during which the solution A is placed as a slurry (kneading time) until the solution A and the solution B are mixed has a great influence on the loosening property. It is known to exert That is, if the mixing time is increased, the hydration reaction of the solution A in the slurry proceeds, and the pH of the slurry is increased, thereby promoting the gelation of the ground injection material when mixed with the solution B. This promotion of gelation not only shortens the gel time of the ground injection material, but also results in undesirable results such as lowering the permeability of the ground injection material.

[0004]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a suspension-type and slow-setting type soil injection material in which the kneading time of the slurry of the powdery material having hydraulic properties is reduced by the performance such as gel time. An object of the present invention is to provide a ground injection material that is hardly affected.

[0005]

Means for Solving the Problems As a result of intensive studies, the present inventors were able to solve the above-mentioned conventional problems. That is, the present invention provides a solution A comprising a slurry mainly containing a powder material having hydraulic properties, a silica sol and / or
Or a suspension-type ground injection material composed of liquid B containing water glass as a main component, wherein the liquid A is mixed with a hydration inhibitor that suppresses hydration of the powder material. It is intended to provide an injection material.

[0006] Further, the present invention provides a method for producing a hydration inhibitor, comprising:
An object of the present invention is to provide the above ground injection material, which is at least one selected from the group consisting of phosphates, borates, oxycarboxylates, dicarboxylic acids, ketocarboxylic acids, sugar alcohols and sugars.

Further, the present invention provides the above-mentioned ground injection material, wherein the hydration inhibitor is blended at a ratio of 0.05 to 10% by weight with respect to the powder material.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION

(Solution B) The Solution B used in the present invention comprises silica sol and / or
Alternatively, the main component is water glass. The silica sol has a particle size of, for example, 1 to 100 μm (0.1
μ), preferably 5 to 50 μm, and is a colloid of ultrafine particles stably dispersed in a solvent without sedimentation, and the main component of the solute is silica. Silica sol has stabilizing ions such as sodium, ammonium, and chlorine as main characteristics of the silica sol, or aluminum ion on the surface, in view of the stability of silica particles and various performances (penetration, etc.) as a ground injection material. It is preferable that a solid acid is formed by coordinating different metals having different electric valencies such as described above and the dissociation of silanol groups on the surface is imparted in a wide pH range to impart stability. Commercially available water glass can be used as it is. When silica sol is used, commercially available silica sol can be used as it is, but it is preferable that the SiO ₂ concentration is 10 to 60% by weight, the average particle diameter is 3 to 50 mμ, and the viscosity is 50 cps (25 ° C.) or less.

(Solution A) The Solution A used in the present invention comprises a slurry mainly composed of a powder material having hydraulic properties. The powder material is not particularly limited. However, it is preferable to use a powder material containing cement clinker and / or cement fine powder, blast furnace slag fine powder, and gypsum fine powder because permeability is improved. More preferred embodiments of these various components will be further described below.

The cement clinker and / or cement fine powder (hereinafter referred to as cement fine powder) includes, for example, ordinary, fast-strength, ultra-fast-strength, moderate heat, and sulfate resistance. Normal or early strength is preferred as satisfying both of the expressions. In addition, this cement fine powder shall not be derived from the mixed cement because it cannot control the particle size of each component.

The maximum particle size of the cement fine powder is 1
0.5 μm or less, and the passage of 2.2 μm is 50% by volume or less, preferably 40% by volume, based on the whole cement fine powder.
The capacity% or less is good.

The blast furnace slag is preferably a rapidly cooled blast furnace water slag. The particle size of the blast-furnace slag fine powder is preferably such that the maximum particle size is 10.5 μm or less, and the passage of 2.2 μm is 50% by volume or less, preferably 40% by volume or less based on the whole blast-furnace slag fine powder.

The gypsum fine powder is preferably gypsum dihydrate or anhydrous gypsum. The maximum particle size of the gypsum fine powder is preferably 10.5 μm or less.

The raw material cement clinker and / or
Alternatively, in the case where cement and gypsum are mixed and pulverized, the mixture desirably satisfies a maximum particle size of 10.5 μm or less and a volume of 2.2 μm passage of 50% by volume or less.

(Blending ratio) When the above powder materials are used, the blending ratio is such that 0 to 50 parts by weight of cement fine powder (excluding gypsum), 50 to 100 parts by weight of blast furnace slag fine powder and gypsum fine powder In an amount of 0.5 to 3.0 parts by weight in terms of SO ₃ . Note that the gypsum fine powder takes into account gypsum in cement.

The powdered material may optionally contain a pozzolanic substance such as fly ash or a calcium compound such as calcium carbonate or slaked lime, preferably having a maximum particle size of 10.5.
μm or less and 2.2 μm pass through is 5% of the total components.
As a particle size of 0% by volume or less, it can be used by substituting about 10 parts by weight at the maximum for blast furnace slag fine powder.

Further, in the powder material, the amount of particles having a particle size of 1 μm or less is preferably 15% by volume or less from the viewpoint of permeability.

(Production of powder material) In the case of producing a powder material using the above-mentioned various components, it is necessary to separately pulverize and classify at least the blast furnace slag and other components. In this way, it is possible to prevent the cement fine powder from being biased to the ultra fine powder due to the difference in grindability, and to prevent the cement fine powder from being amorphous due to over-pulverization.

More specifically, for example, at least blast furnace slag can be pulverized and classified separately from other components, and then the resulting blast furnace slag fine powder can be mixed with the classified other components.

Further, the cement component and the gypsum are mixed and crushed and classified, and separately from this, blast furnace slag is crushed and classified,
The components obtained after this may be mixed.

Further, the cement component, the blast furnace slag and the gypsum may be individually ground and classified, and thereafter, the components may be assembled and mixed.

(Hydration Inhibitor) The hydration inhibitor used in the present invention can be variously selected from those capable of suppressing the elution of Ca ions due to the hydration reaction in the solution A. For example, it is preferable to contain at least one or more of fluoride, phosphate, borate as an inorganic material, and oxycarboxylate, dicarboxylic acid, ketocarboxylic acid, sugar alcohol and sugar as an organic material. More specifically, examples include disodium phosphate, citric acid, sodium citrate, gluconic acid, sodium gluconate, tartaric acid, sodium tartrate, sucrose, humic acid, and the like.

It is effective to add the hydration inhibitor to the solution A, and it is more preferable to dissolve the hydration inhibitor in the conditioned water of the solution A in advance.

The mixing ratio of the hydration inhibitor is not particularly limited as long as it does not impair the performance as a ground injection material (especially, the development of compaction strength). , 0.05 to 10% by weight is preferred.

In the ground injection material of the present invention, for the purpose of adjusting the gel time, a gel time adjusting agent may be blended with at least one of the solution A and the solution B.
Examples of the gel time adjusting agent include bicarbonates, carbonates, phosphates and oxalic acids of alkali metals and alkaline earth metals,
At least one or more of ammonium salts and the like, and more specifically, sodium hydrogen carbonate (NaHCO ₃ ),
And sodium carbonate (Na ₂ CO ₃ ). It is also effective to blow carbon dioxide gas. More preferably, those having high solubility in water are suitable.

The gel time adjusting agent may be added to the solution B, but it is effective to add it to the solution A, and it is more preferable to dissolve it in the conditioned water of the solution A in advance. When the gel time adjuster is dissolved in the conditioned water of the solution A in advance, it is more effective and preferable to increase the powder material concentration in the solution A.

The amount of the gel time adjusting agent is not particularly limited as long as the performance as a ground injection material is not impaired, but is preferably from 1 to 30 with respect to the total solid content of the silica sol and the powder material. % By weight is preferred.

As the hydration inhibitor and the gel time adjuster, commercially available reagents and the like can be used, but from the viewpoint of reducing material costs, industrial products or products calculated naturally can be used.

(Preparation of Ground Injection Material of the Present Invention) The ground injection material of the present invention can be prepared by mixing solution A and solution B. The mixing ratio of these is not particularly limited, but the powder material: silica sol and / or water glass is 1: 9 to 9: 1 by weight conversion, preferably 5: 5 to 5: 1.
It is preferable to mix both such that the ratio becomes 8: 2.
Further, the weight ratio of water / solid content is preferably 200% to 1500% for the whole ground injection material to which the adjusted water of each liquid is added.

[0030]

The present invention will be described below with reference to examples.
These embodiments are merely examples of the present invention, and the present invention is not limited to these embodiments.

(Examples 1 to 13) As the solution B, a silica sol having a trade name of SI-350 manufactured by KATAKASEI KOGYO CO., LTD. Was used. Table 1 shows the characteristics of the silica sol. As a powder material (powder A) used for the liquid A, one having properties as shown in Table 2 was used. The powder A is manufactured by mixing and pulverizing 100 parts by weight of the early-strength cement clinker fine powder and 3 parts by weight in terms of gypsum fine powder SO ₃ (100 volume% for 10.5 μm passage, 2.2 μm passage Min 4
0.5 part by volume) and 25 parts by weight of blast furnace slag fine powder (1
100% by volume for 0.5 μm passage, 2.2 μm passage
(4% by volume) was mixed and produced. The particle size was measured using a laser type particle size distribution analyzer (HELOS).

Further, in the basic formulation shown in Table 3, Liquid A and Liquid B were prepared, and various hydration inhibitors shown in Table 4 were added to Liquid A in the amounts shown in Table 5. This addition amount is% by weight based on the powder material.

The mixing time of the solution A shown in Table 5 (5, 10
Solution A and Solution B were mixed, and the gel time was measured. Gel time was measured by the cup inverted method. Table 5 also shows the obtained results.

[0034]

[Table 1]

[0035]

[Table 2]

[0036]

[Table 3]

[0037]

[Table 4]

[0038]

[Table 5]

From the measurement results of the gel time shown in Table 5, it can be seen that the ground injection material of the present invention is a loose-binding material having a longer gel time than the conventional one. That is, in the basic formulation without adding the hydration inhibitor, the ground injection material is instantaneously set when the mixing time is 30 minutes, whereas the ground injection material of the present invention is good even when the mixing time is 30 minutes. Gel time is obtained.

[0040]

According to the present invention, in a suspension-type and slow-setting type soil injection material, the mixing time of the slurry of the powdery material having hydraulic property is hardly affected by the performance such as the gel time. An injection material is provided.

──────────────────────────────────────────────────続 き Continued on front page (51) Int.Cl. ⁶ Identification code FI // (C04B 28/24 24:06) 103: 20

Claims (3)

[Claims] 1. A suspension type ground injection material comprising a liquid A composed mainly of a powdery material having hydraulic properties and a liquid B mainly composed of silica sol and / or water glass, A ground injection material, wherein a hydration inhibitor that suppresses hydration of the powder material is added to the liquid A. 2. The hydration inhibitor is at least one selected from the group consisting of fluorides, phosphates, borates, oxycarboxylates, dicarboxylic acids, ketocarboxylic acids, sugar alcohols and sugars. The ground injection material according to claim 1. 3. The method according to claim 1, wherein the hydration inhibitor is present in an amount of 0.0
The ground injection material according to claim 1 or 2, which is blended at a ratio of 5 to 10% by weight.