JP3180095B2 - Additive for hydraulic composition containing generated soil - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an additive used for a hydraulic composition containing generated soil, a hydraulic hardening material and water.

[0002]

2. Description of the Related Art A large amount of generated soil is generated during construction work for constructing an underground structure, and it is difficult to treat it. Various methods have been studied for effectively utilizing the generated soil to use it as a structural material, a backfill material, a backfill material, and the like. For example, there is a backfilling method using a hydraulic composition having a strength capable of using the excavated soil as it is by mixing the excavated soil with a hydraulic hardening material, adding water and fluidizing the excavated soil. However, a hydraulic composition using excavated soil (generated soil) containing a clay component, a silt component, and the like requires a large amount of water to obtain appropriate fluidity for construction.
There is a problem that sufficient strength cannot be obtained due to an increase in the ratio of the hydraulic solidifying material, and that the cured product undergoes large shrinkage and cracks occur in the cured product.

[0003] Another conventional technique (Japanese Patent Laid-Open No. 6-2493) is also known.
No.), there is proposed a shield construction method that utilizes the excavated soil to improve the above problems and effectively use the generated soil. The outline is that a thin panel is arranged inside a cylindrical segment through a gap and connected with self-standing bolts. In the gap, a solidifying material (for example, cement), water, and a fluidizing agent are mixed with the excavated soil. The slurryed material is injected from an injection hole to be integrated. In the case of this method, due to the influence of the clay and silt components contained in the generated soil, the fluidity of the injection material decreases rapidly with the passage of time after kneading,
In many cases, the pumping, injection, and driving operations of the injection material are hindered. For this reason, there is a problem that a large amount of a fluidizing agent must be used. In addition, in the case of this method, the gap is filled with an injectant to form a tunnel segment, which is insufficient for effective use of a large amount of generated soil.

[0004]

SUMMARY OF THE INVENTION A hydraulic composition containing generated soil, a hydraulic solidifying material and water has been required to elapse over time after kneading in view of workability such as pumping, pouring and driving. There is a demand for improvement in fluidity such that a desired fluidity can be obtained with a small amount of water from the viewpoints of the strength of the cured product and drying shrinkage from the viewpoint of the reduced fluidity. Therefore, an object of the present invention is to solve the problems of the conventional technology,
Generated soil, reduced hydraulic fluid composition containing water and the hydraulic composition containing water reduces the decrease with time, and also reduces the amount of water in the hydraulic composition to obtain the desired fluidity. An object of the present invention is to provide an additive used for improving the fluidity of a hydraulic composition.

[0005]

The present inventors have conducted various studies to solve the above-mentioned problems, and as a result, have found that an additive having a masking effect and / or a function as a dispersant can solve the above-mentioned problems. As a result, the present invention has been completed. That is, the present invention relates to an additive for a generated soil-containing hydraulic composition having a masking effect of improving the flowability of the generated soil-containing hydraulic composition and / or acting as a dispersant, and having a masking effect. It is an object of the present invention to provide the additive, which comprises an admixture having an action as an agent and / or a dispersant.

[0006] The admixture having a masking effect in the present invention is used mainly for the purpose of reducing the decrease in fluidity of the hydraulic composition, and the admixture having an action as a dispersant in the present invention is a hydraulic admixture. Reduce the amount of water in the composition,
And it is used for the purpose of obtaining desired fluidity. The object of the present invention is achieved by an additive for generated soil-containing hydraulic composition containing one or both of the admixtures. Further, when the additive for the generated soil-containing hydraulic composition of the present invention is used, the additive may be simply added to the generated soil-containing hydraulic composition. May be added in two portions. As a particularly preferred mode of use, when mixing the hydraulic hardening material and water in the generated soil, as a pre-additive, the additive of the present invention mainly containing an admixture having a masking effect was added, and the mixture was stirred and mixed. Thereafter, when the additive of the present invention mainly containing an admixture having a function as a dispersant as a post-additive is added and stirred and mixed again, the fluidity of the generated soil-containing hydraulic composition is most improved.

The present invention will be described more specifically. Examples of the admixture having a masking effect in the present invention include oxycarboxylic acids, phosphonic acid derivatives or salts thereof, saccharides and derivatives thereof. Examples of the oxycarboxylic acid or a salt thereof include gluconic acid, glucaric acid, glucoheptonic acid, arabonic acid, malic acid, citric acid, and alkali metal salts such as sodium salt and potassium salt thereof, alkaline earth salts such as calcium salt and magnesium salt. Metal salts,
Organic salts such as ammonium salts and triethanolamine salts can be mentioned. Further, as the phosphonic acid derivative or a salt thereof, aminometaphosphonic acid, aminotrimethylphosphonic acid, methylenephosphonic acid, 1-hydroxyethylidene-1,1-diphosphonic acid, phosphonocarboxylic acid derivative or a salt thereof, a saccharide or a salt thereof Derivatives include monosaccharides such as glucose, fructose, galactose, mannose, xylose, arabinose, and ribose; disaccharides such as maltose, sucrose, and lactose; trisaccharides such as maltotriose and raffinose; oligosaccharides; and sugars such as sorbitol. Alcohol or its derivatives can be mentioned.

The admixture having the function of a dispersant in the present invention includes a water reducing agent having a dispersing action, A
E water reducing agent, high performance water reducing agent and high performance AE water reducing agent can be exemplified. Examples of the water reducing agent and AE water reducing agent include ligninsulfonic acid, oxycarboxylic acid or salts and saccharides thereof, and high performance water reducing agent and high performance AE water reducing agent. Examples of the water reducing agent include melamine sulfonic acid formalin condensate, naphthalene sulfonic acid formalin condensate, polycarboxylic acid, polyalkyl sulfonic acid and aromatic amino sulfonic acid or derivatives thereof and / or
Or salts thereof.

Examples of the hydraulic setting material in the present invention include Portland cement, mixed cement, slag powder, gypsum-based mixture, quicklime, slaked lime and fine-grained calcined dolomite. Rubble, sand, silt, clay and other soil generated at construction sites, muddy water and residual soil due to excavation of bentonite, clay, silt, water, coagulants, etc. it can.

[0010] The amount of the admixture having a masking effect is 0.01 to 0.01 with respect to the hydraulic solidifying material in the hydraulic composition.
~ 5.0 wt% is an appropriate amount. 0.01% by weight used
If the amount is less than the above, the fluidity of the hydraulic composition cannot be maintained for a long time, and if the amount used exceeds 5.0% by weight, the hydraulic composition may not sufficiently exhibit the initial strength. It is not limited to the amount, and the amount used can be determined in an arbitrary range according to the type of generated soil as long as the purpose is achieved.

The amount of the admixture acting as a dispersant is determined based on the amount of the hydraulic hardening material in the hydraulic composition.
An appropriate amount is 0.01 to 5.0% by weight. Used amount is 0.0
If the amount is less than 1% by weight, the desired water-reducing property and fluidity of the hydraulic composition cannot be obtained. If the amount used exceeds 5.0% by weight, the hydraulic composition may not have sufficient initial strength. However, it is not limited to this usage amount, and the usage amount can be determined in an arbitrary range according to the type of generated soil as long as the purpose is achieved.

Further, the admixture for a hydraulic composition containing a generated soil according to the present invention may be used in order to increase the viscosity of the hydraulic composition to prevent separation, and to provide a water-soluble polymer such as cellulose ethers and polyacrylates. , Polyethylene oxide, and natural polysaccharides such as curdlan, welan gum and xanthan gum.

[0013]

In the present invention, the admixture having a masking effect masks the fine soil particles in the generated soil to prevent contact with the particles of the hydraulic hardening material and to maintain fluidity for a long time. It does not hinder the reaction between the hydraulic hardening material and water after a certain period of time, and thus has the effect of being a factor for sufficiently developing strength after days. Further, in the present invention, the admixture having an action as a dispersant is used to uniformly disperse the generated soil and the hydraulic solidifying material in the hydraulic composition by the dispersing action, thereby causing a water reducing action, and maintaining the fluidity. And it works to increase the strength of the cured body.

[0014]

Embodiments of the present invention will be described below. 1) Materials used Table 1 shows the materials used for the test. The generated soil is separated into clay and silt while washing it with water using a sieve of 75 μm, and the clay and silt are used in a state of being dispersed in water.

[0015]

[Table 1]

2) Formulation of hydraulic composition The formula of the hydraulic composition is shown in Table 2. Formula B in Table 2
Is a formulation in which the amount of water is reduced by 75 kg from formulation A, and formulations D and E are formulations in which the amount of water is reduced by 55 kg from formulation C.

[0017]

[Table 2]

3) Test method a) Method of mixing hydraulic composition (1) Using a mortar mixer as an admixture having a masking effect on generated soil, cement, and water, or as an admixture having a masking effect and a dispersant The mixture of the working admixture is added and mixed with stirring for 2 minutes. (2) Using a mortar mixer, add an admixture having a masking effect to the generated soil, cement, and water, stir and mix for 2 minutes, and then add an admixture that acts as a dispersant and stir and mix for 2 minutes. I do. b) Time-dependent change in fluidity of the hydraulic composition The hydraulic composition produced in the above a) was allowed to stand for a predetermined period of time, kneaded with a mortar mixer for 30 seconds before measurement, and measured for fluidity according to JIS R5201. Measure by test. c) Pumpability The state of material separation after the flow test is visually observed and evaluated. d) Compressive strength Performed according to JIS A 1108. e) Drying shrinkage According to JIS A 1129, the length change for about 3 months was measured by indoor curing at a humidity of 60%.

4) Test results The test results are shown in Table 3. The amounts of the admixture having a masking effect and the admixture acting as a dispersant in Table 3 are shown in terms of solid weight% relative to cement. Also,
The method of adding the admixture in Examples 3, 4, 7, 8, and 15 is the same as the method (1) shown in 3) Test method a) Method of mixing hydraulic composition. According to the method of 2).

In Table 3, Comparative Examples 1 and 2 and Comparative Example 1
Nos. 3 and 14 are cases where neither an admixture having a masking effect nor an admixture acting as a dispersant is used.
In addition, Examples 3 to 6 and 15 are examples in which only an admixture having an action as a dispersant is used, and Examples 5 and 6 are examples in which an admixture having an action as a dispersant is used separately. Examples 7 and 8 are cases where only an admixture having a masking effect is used, and Examples 9 and 10 are mixtures of an admixture having a masking effect and an admixture having an action as a dispersant. Example 1
Nos. 1, 12, and 16 to 42 are the cases where an admixture having a masking effect and an admixture acting as a dispersant are separately used.

From the test results in Table 3, the following findings were obtained. a) Fluidity of Hydraulic Composition and Fluctuation in Fluidity with Time Examples 3 to 12 are different from Comparative Example 2 in Examples 15 to
No. 42 showed an increase in fluidity as compared with Comparative Example 14. Further, in Examples 7 to 12 and 16 to 42 using the admixture having a masking effect, the decrease with time of the fluidity was small, and particularly, Examples 11, 12, and 16 to 42 were
The desired fluidity is obtained after the kneading is completed, and the fluidity is hardly reduced even after 90 minutes.

B) Pumping properties Examples 11, 12 and 16 to 42 are comparative examples 1 and 13.
As a result, it was confirmed that there was no separation and a good state was exhibited, and that there was no problem in pumping performance. c) Compressive strength Examples 3 to 12 are different from Comparative Example 1 in Examples 15 to
Sample No. 42 had an increased compressive strength as compared with Comparative Example 13. d) Drying shrinkage The length change rate of Example 11 was 4.2 × 10 at 30 days of age.
^-3 , with little change since then. This value is larger than the change rate of concrete material,
Not a large value for soil cement materials. In addition, it is considered that the rate of change is stabilized quickly, and this is one of the features.

[0023]

[Table 3]

[0024]

According to the present invention, the following remarkable effects are obtained. 1) A large amount of soil generated at construction sites can be effectively used, contributing to environmental improvement and resource recycling. 2) Pumpability and fluidity required for operations such as injection and driving can be maintained for a long time. 3) It is possible to obtain a desired strength required by the reuse part. 4) No cracking and long-term use. 5) The dimensional change rate is small as a soil cement material, and the change rate is quickly stabilized. 6) It can be manufactured on site and the generated soil can be used immediately.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI C09K 17/02 C09K 17/02 P 17/06 17/06 P 17/10 17/10 P 17/44 17/44 P // C04B 111: 70 C09K 103: 00 (56) References JP-A-5-106224 (JP, A) JP-A-63-265991 (JP, A) JP-A-50-44977 (JP, A) JP-A Sho 60 JP-A-141785 (JP, A) JP-A-55-123680 (JP, A) JP-A-59-120681 (JP, A) JP-A-58-109583 (JP, A) Cement / concrete chemistry and its applications 86-92 (No. 14 Mechanism of delay and super-delay) (Cement Association of Japan, issued in 1987) (58) Fields investigated (Int. Cl. ⁷ , DB name) C09K 17/48 C04B 22 / 16 C04B 24/06 C04B 24/10 C04B 28/00 C09K 17/10

Claims (16)

(57) [Claims] 1. An additive for a generated soil-containing hydraulic composition having a masking effect and / or an action as a dispersant, which improves the flowability of the generated soil-containing hydraulic composition, and which has a masking effect. The additive comprising: 2. An additive for a generated soil-containing hydraulic composition, which has a masking effect for improving the flowability of the generated soil-containing hydraulic composition and / or acts as a dispersant, and which has a masking effect. And an admixture having the function of a dispersant. 3. A hydraulic hardening material, water and a pre-additive are added to the generated soil, and the mixture is stirred and mixed. Then, a post-additive is added to the generated soil, followed by stirring and mixing again to produce a hydraulic composition containing the generated soil. 3. The additive according to claim 1 or claim 2, wherein the additive is used as a pre-additive in a method of performing the process. 4. An extruded soil is added with a hydraulic solidifying material, water and a pre-additive comprising the additive according to claim 1 and mixed with stirring, and then a post-additive is added thereto and stirred again. In the method of producing a generated soil-containing hydraulic composition by mixing,
Use of an additive containing an admixture acting as a dispersant as a post-additive. 5. The use according to claim 4, wherein the post-additive further comprises an admixture having a masking effect. 6. The admixture having a masking effect is one or more selected from oxycarboxylic acids, phosphonic acid derivatives or salts thereof, saccharides or derivatives thereof. The additive according to any one of Items 1 to 3. 7. The admixture having a masking effect is one or more selected from oxycarboxylic acids, phosphonic acid derivatives or salts thereof, saccharides or derivatives thereof. Use as described in. 8. The oxycarboxylic acid or salt thereof is one or more selected from gluconic acid, glucaric acid, glucoheptonic acid, arabonic acid, malic acid, citric acid and salts thereof. The additive according to claim 6, wherein 9. The phosphonic acid derivative or a salt thereof is selected from aminometaphosphonic acid, aminotrimethylphosphonic acid, methylenephosphonic acid, 1-hydroxyethylidene-1,1-diphosphonic acid, phosphonocarboxylic acid derivative and a salt thereof. Characterized by being one or more selected,
The additive according to claim 6. 10. The saccharide or a derivative thereof is glucose,
Fructose, galactose, mannose, xylose, arabinose, monosaccharides such as ribose, maltose,
Sucrose, disaccharides such as lactose, maltotriose, trisaccharides such as raffinose, oligosaccharides, sugar alcohols such as sorbitol or one or more selected from derivatives thereof, Claim 6
The additive according to the above. 11. The admixture having an action as a dispersant is one or more selected from water reducing agents, AE water reducing agents, high performance water reducing agents, and high performance AE water reducing agents. 3. The additive according to claim 2, wherein 12. The admixture having an action as a dispersant is one or more selected from water reducing agents, AE water reducing agents, high-performance water reducing agents, and high-performance AE water reducing agents. The use according to claim 4 or 5, wherein 13. The method according to claim 11, wherein the water reducing agent and the AE water reducing agent are one or two or more selected from ligninsulfonic acid, oxycarboxylic acid or a salt or saccharide thereof. Additives as described. 14. The high-performance water reducing agent and the high-performance AE water reducing agent may be a melamine sulfonic acid formalin condensate, a naphthalene sulfonic acid formalin condensate, a polycarboxylic acid, a polyalkyl sulfonic acid, an aromatic amino sulfonic acid or a derivative thereof; The additive according to claim 11, wherein the additive is one or more selected from salts. 15. The hydraulic hardening material selected from the group consisting of portland cement, mixed cement, slag powder, gypsum-based mixture, quicklime, slaked lime, and fine-grained fired dolomite. As described above, the generated soil and water are included.
15. The additive according to any one of 1, 13, and 14. 16. The rubble generated at a construction site,
One or more types selected from sand, silt, clay, etc., bentonite, clay, silt, water, muddy water from excavation such as coagulant, residual soil, and overlying soil due to overlying, etc. An additive according to claim 15, characterized in that it is present.