JP2000128661A - Production of water-permeable cellular mortar and the mortar and mortar material used therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for producing water-permeable cellular mortar having excellent flowability, excellent early strength and excellent underwater non-separability by kneading an early strength underwater non-separable mortar material comprising a superquick hardening cement, fine aggregates and a thickening agent with water and air bubbles prepared from a foaming agent and water. SOLUTION: The superquick hardening cement is a cement represented by formulas: C11A7, CaF2, C12A7, C3A, CA, etc., wherein C is CaO; A is Al2O3. The fine aggregates include river sand, crushed sand, silica sand, etc. A coagulation retarder includes citric acid and sodium carbonate. A high performance water reducer includes polycarboxylate-based polymeric compounds and alkylallylsulfonic acid salts. The thickening agent includes methyl cellulose and polyacrylamide. The foaming agent includes higher alkyl ether sulfate ester salts and polyethylene glycol type nonionic surfactants. The mortal preferably comprises 100 pts.wt. of a superquick hardening cement, 200-500 pts.wt. of fine aggregates, 0.05-5 pts.wt. of a coagulation retarder, 0.05-2 pts.wt. of a high performance water reducer and 0.05-2 pts.wt. of a thickening agent.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a water-permeable cellular mortar, the mortar, and a mortar material used for the mortar. More specifically, water-permeable foam mortar with excellent fluidity, fast strength, and inseparability in water that is filled and constructed for various cavities and voids, such as backfilling tunnels with water and voids in the ground The present invention relates to a method for producing the mortar, the mortar, and a fast-strength water-inseparable mortar material used for the mortar.

[0002]

2. Description of the Related Art Conventionally, cellular mortar has been used for filling various cavities and voids such as backfilling tunnels and voids in the ground. However, when the mortar is applied to a place where water exists or a place where water flows slightly, the foam mortar is diluted or washed away with water, and the cavities and voids cannot be completely filled.

For example, Cement / Concrete Transactions N
o. 45 "Study on Development of Permeable Concrete" proposes a method for producing permeable concrete by forming continuous voids in the concrete by using a foaming agent. It cannot be installed in places where water flows slightly.

Japanese Unexamined Patent Publication No. Sho 57-36218 discloses an underwater construction method of permeable concrete.
Japanese Patent Application Laid-Open No. 3-21765 proposes a construction method of inserting permeable concrete into an underground drainage hole provided for preventing landslides in the ground. In these methods, a unit fine aggregate amount is selected. This is a method to secure water permeability by forming voids between coarse aggregates of concrete.Although these concretes have excellent water permeability, workability is poor because there is almost no fluidity. This technique cannot be applied to mortars that do not.

On the other hand, Japanese Patent Publication No. 6-94555 discloses that
A roadbed material having water permeability and a reinforced roadbed construction method have been proposed.This method is excellent in water permeability and strength, but after spreading the roadbed material at a predetermined height and spraying water, Is lightly pressurized to provide a void and continuously solidify.

[0006]

[Background of the Invention] To prevent backfilling of railway or road tunnels where water exists or a small amount of water flows, reinforcement and repair of railway roadbeds and permeable concrete pipes, and prevention of landslides in the ground. Foam mortar used to fill, reinforce, and repair various cavities and voids, such as filling underground drainage holes, has low separation resistance to water at the time of construction and fluidity required for construction. Is required to have water permeability.
In addition, for example, since the repair of the railway bed is performed at night when train operation is stopped, the foam mortar used for this is stopped in about 3 hours in a short time by stopping the running water at the construction site and pouring the foam mortar. Immediately after this, the required strength development is required. Therefore, the object of the present invention is to solve the above-mentioned problems of the prior art, and to fill and construct various cavities and voids in which water exists or in which water flows slightly, flowability,
It is an object of the present invention to provide a method for producing a water-permeable cellular mortar excellent in fast strength and inseparability in water, and a mortar and a fast strength inseparable mortar material used in the mortar.

[0007]

Means for Solving the Problems The present inventors have conducted various studies to solve the above-mentioned problems, and as a result, found that air bubbles were generated in a mortar material containing ultra-fast-hardening cement, fine aggregate and a thickener. The present inventors have found that the mixed cell mortar can solve the above-mentioned problems at once, and have completed the present invention. That is, the present invention, ultra-rapid hardening cement, fine aggregate, kneading water into a high-strength underwater inseparable mortar material containing a thickener,
Then, a method for producing a water-permeable foam mortar obtained by mixing foam prepared from a foaming agent and water, or foaming with an ultra-fast water-insoluble mortar material containing ultra-fast cement, fine aggregate, and a thickener The present invention relates to a method for producing a water-permeable cellular mortar obtained by simultaneously mixing an agent and water. Further, the present invention relates to a mortar manufactured by the above manufacturing method. Furthermore, the present invention relates to an early-strength water-inseparable mortar material for use therein.

The method for producing a water-permeable mortar according to the present invention may be carried out by either a preform method or a mixed-form method. Underwater inseparable mortar material 1
Mortar 4 in which 00 parts by weight and 10 to 50 parts by weight of water are kneaded.
Bubbles adjusted from a foaming agent and water in a volume of 00 to 600 parts by volume
0 to 400 parts by volume, and in the case of a mixed foam method, a high-strength water-insoluble mortar material 10
Mortar 400 consisting of 0 parts by weight and 10 to 50 parts by weight of water
It is appropriate to adjust so as to be 600 volume parts and 600-400 volume parts of bubbles.

The flow rate of the foam mortar of the present invention is preferably 170 or more in consideration of workability, filling property into voids and the like. In addition, for example, in order to satisfy the required water permeability as a railway board material, the water permeability of the cured product is preferably 1 × 10 ⁻⁴ cm / sec or more, and for that purpose, the specific gravity of the cellular mortar is required. Is preferably 1.2 or less. Further, if a compressive strength of 1 kgf / cm ² or more after 3 hours of kneading is obtained, it is advantageous in preventing washing by running water.

[0010] The fast-strength water-inseparable mortar material of the present invention contains an ultra-rapid hardening cement, fine aggregate, and a thickener as essential components, and further contains a setting retarder and a high-performance water reducing agent as required. Things. The preferred composition ratio of the mortar is 200 to 500 parts by weight of fine aggregate, 0.05 to 5 parts by weight of a setting retarder, and 0.05 to 2 parts by weight of a high-performance water reducing agent based on 100 parts by weight of the ultra-hard cement. Parts, thickener 0.05
~ 2 parts by weight.

The amount of the fine aggregate is preferably 200 to 500 parts by weight, or about 400 parts by weight, based on 100 parts by weight of the ultra-fast-hardening cement in consideration of economy, material separation and reduction in strength. The amount of the setting retarder used is determined by considering the working time required for construction and the separation resistance to water.
0.1 to 5 parts by weight with respect to parts by weight is appropriate. The amount of the high-performance water reducing agent to be used is suitably 0.05 to 2 parts by weight with respect to 100 parts by weight of the ultra-rapid hardening cement in consideration of fluidity and material separation. The amount of the thickening agent to be used is suitably 0.05 to 2 parts by weight based on 100 parts by weight of the ultra-fast-hardening cement in consideration of the inseparability in water and the economics due to the increase in the amount of the high-performance water reducing agent.

[0012] The ultra-rapid hardening cement in the present invention includes:
Calcium oxide (CaO) is replaced by C, aluminum oxide (A)
When l ₂ O ₃ ) is represented by A, calcium by Ca, and fluorine by F, jet cement containing C ₁₁ A ₇ .CaF ₂ as a main component (trade name, manufactured by Chichibu Onoda or Sumitomo Osaka Cement), _{C 12 a 7, C 3 a} , mild jet cement composed mainly of calcium aluminate heat treatment and crushing was cement and gypsum, etc. represented by the _CA or the like (trade name, Sumitomo Osaka cement Co., Ltd.) and Super cement (trade name, Denka Kagaku Kogyo Co., Ltd.), heat-treated and pulverized calcium aluminate in early-strength cement or ordinary cement
A mixture of 0 parts by weight can be exemplified. The calcium aluminate used here is a CaO raw material or A
A material obtained by subjecting a mixture of l ₂ O ₃ raw materials and the like to a heat treatment such as firing in a kiln or melting in an electric furnace. Further, as the ultra-rapid hardening cement, a commercially available cement to which a setting retarder has already been added can be used.

Examples of the fine aggregate in the present invention include river sand, crushed sand, blast furnace slag crushed sand, silica sand and the like. Examples of the setting retarder in the present invention include citric acid, gluconic acid, tartaric acid, malic acid and salts thereof, sodium carbonate, potassium carbonate, and sodium bicarbonate. .
Examples of the high-performance water reducing agent in the present invention include a polycarboxylate-based polymer compound, an alkylallyl sulfonate, a naphthalene sulfonate formalin condensate, and a melamine sulfonate formalin condensate. Any body shape can be used.

Examples of the thickener in the present invention include methylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, hydroxyethylmethylcellulose, hydroxypropylmethylcellulose, hydroxyethylethylcellulose, polyacrylamide, a copolymer of polyacrylamide and sodium acrylate, and polyacrylamide. A partial hydrolyzate and the like can be exemplified.

The foaming agents in the present invention include anionic surfactants such as higher alkyl ether sulfates, sodium alkylbenzene sulfonates, rosin soaps, maleated rosin soaps, polyethylene glycol-type nonionic surfactants, and amino acid-type surfactants. Examples include amphoteric surfactants and protein foaming agents. The foaming agent can be used in a preform method in which a foaming agent is diluted with a solution obtained by diluting the foaming agent by several tens and a foaming machine, and then mixed with a separately manufactured mortar, or a foaming agent is added to the mortar and a mixer is used. Any of the mixed foam methods in which air bubbles are entrained in the mortar by stirring with a mortar can be used. What is necessary is just to adjust the usage-amount of a foaming agent according to the manufacturing method of a mortar, the usage-amount which can obtain 40-60% of air amounts.

The amount of the kneading water in the present invention is suitably from 10 to 50 parts by weight with respect to 100 parts by weight of non-separable mortar in water. If it is more than 50 parts by weight, a problem of material separation of the aggregate occurs.

The water-inseparable mortar material of the present invention is a premix type in which fine aggregate, ultra-rapid hardening cement, setting retarder, high-performance water reducing agent, and thickener are preliminarily mixed. It is a preferred method because there is no weighing error, but these materials can also be mixed and stirred on site.

Hereinafter, the present invention will be further described with reference to examples, but the present invention is not limited to these examples.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Materials used Table 1 shows the materials used for the test.

2. Specific gravity, flow, water permeability, compressive strength, flow resistance, hydrostatic resistance test of cellular mortar 2.1 Mixing and kneading of cellular mortar Kneading a mortar material with the composition shown in Table 2 5
To 80 parts by volume, 420 parts by volume of bubbles produced using a foaming agent were mixed to produce a water-permeable bubble mortar.

2.2 Test Method 1) Specific Gravity: The weight of mortar was measured using a cylindrical steel container having a capacity of 500 ml, and calculated by dividing by the volume of the container. 2) Flow: The cylinder method specified in JHS 313 was used. 3) Compressive strength: A cylindrical specimen having a diameter of 5 × 10 cm was prepared and performed according to JIS A1108. 4) Permeability: Prepare a specimen of φ10 × 20cm,
The water pressure was set to 2 kgf / cm ² and measured by the method shown in FIG. The test was performed at the age of 7 days. 5) Resistance to running water: mortar is poured into about half a bucket filled with 20 liters of water, and three hours after the mortar is poured, water is poured into the upper half of water at 10 liters / minute for 12 hours to change the state of the mortar. Observed. 6) Hydrostatic resistance: 700 ml of foam mortar,
A steel container filled with water and having a capacity of 500 ml was gently poured into the container, and the specific gravity of the foam mortar replaced with water was measured, and the difference from the specific gravity measured in the air was compared.

[0021]

[Table 1]

[0022]

[Table 2]

2.3 Test Results The test results are shown in Tables 3 and 4. Table 3 shows the case where the type of cement was changed, and Table 4 shows the case where the type and amount of the thickener were changed. As is apparent from Table 3, according to Example 1, the short-term required strength was sufficiently satisfied. In the case of Example 1, the properties against running water were good without the foam mortar being washed away, whereas in Comparative Example 1, about the upper half of the foam mortar was washed away,
The fine aggregate and cement slag settled on the upper part, which was poor. From the results in Table 4, Comparative Example 2, which did not use a thickener, had a high specific gravity filled in water, and the mortar was washed away by water, and the amount of air was reduced. It can be seen that the specific gravities measured in the air are almost equal and good.

[0024]

[Table 3]

[0025]

[Table 4]

3. Test of filling properties of foam mortar and separation resistance to water 3.1 Mixing and kneading of foam mortar Mixing and mixing mortar material of No. 1 shown in Table 2 to 580 parts by volume of mortar manufactured using a foaming agent Bubble 42
0 volume parts were mixed to produce a water-permeable foam mortar.

3.2 Test Method In order to confirm the filling property into the voids and the separation resistance when water is present in the voids, a bubble mortar was pumped into a mold shown in FIG. 2 (manufactured by Shin Meiwa Co., Ltd.). , MM325A, pumping speed:
30 L / min. ). The specific gravity, flow, compressive strength, and permeability test were performed in the same manner as in the 2.2 test method.

3.3 Test Results Table 5 shows the test results. Most of the water in the mold is pushed out from the outlet by the flow of the filled bubble mortar,
Even after curing, foam mortar was filled in every corner of the mold, and good results were obtained. In addition, the physical properties of the foam mortar collected at each position were good without variation.

[0029]

[Table 5]

4. Physical property test of cellular mortar with various types of materials and mixing ratios 4.1 Mixing and kneading of cellular mortars Various types of materials shown in Table 6 and cellular mortars with different mixing ratios were produced.

[0031]

[Table 6]

4.2 Test Method The test was carried out in the same manner as in 2.2 Test Method. 4.3 Test Results As is clear from Table 7, Comparative Example 3 was a case where the fine aggregate was 600 parts by weight, and the fine aggregate settled. Comparative Examples 4 to
No. 7 is a composition having a specific gravity of 1.2 or more, and the water permeability was less than 10 ^-4 , and required water permeability was not obtained. Examples 6 to 9 show the mixing ratio of fine aggregate, Example 10 shows the type of ultra-fast cement, Examples 11 to 12 show the type of fine aggregate,
In Examples 13 and 14, the type of the high-performance water reducing agent was used.
Nos. To 20 are cases where the types of cement and setting retarder were changed, and all showed good results.

[0033]

[Table 7]

[0034]

According to the method for producing a water-permeable cellular mortar of the present invention and the water-inseparable mortar material used in the mortar, good fluidity for filling / constructing various cavities and voids in which water exists is provided. Due to its excellent early strength and non-separability in water, there is no separation by water, and it shows excellent water permeability after curing.

[Brief description of the drawings]

FIG. 1 is a diagram showing a water permeability test method.

FIG. 2 is a view showing an injection mold into which foam mortar is injected in a test of filling property of foam mortar and separation resistance to water.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C04B 24:22 24:38 24:16) 103: 22 103: 32 103: 42 103: 44 111: 40 ( 72) Inventor Seizaburo Murooka 2-2-2 Yoyogi, Shibuya-ku, Tokyo East Japan Railway Company (72) Inventor Yosuke Tokumitsu 2-2-2 Yoyogi Shibuya-ku, Tokyo Tohoku Japan Railway Company Inside the company (72) Inventor Takashi Miyashita 8-14-14 Ginza, Chuo-ku, Tokyo Nippon Special Construction Incorporated (72) Inventor Shotaro Hanawa 8-14-14 Ginza, Chuo-ku, Tokyo Nippon Special Construction Inside (72) Inventor Takao Furusawa 2722 Hagizono, Chigasaki-shi, Kanagawa Prefecture Inside NMB Co., Ltd. (72) Inventor Toru Toyama 2722 Hagizono, Chigasaki-shi, Kanagawa Prefecture NMB Inside F-term (reference) 4G012 PA04 PA29 PA01 PC01 PC03 PC05 PC08 PC13 PD03 4G019 MA03 MA06 MA07

Claims (15)

[Claims] 1. A method for producing a water-permeable cellular mortar, comprising mixing water with a fast-strength water-insoluble mortar material containing ultra-fast-hardening cement, fine aggregate and a thickener, and then foaming the mixture. The above-mentioned production method, wherein air bubbles prepared from the agent and water are mixed. 2. A fast-strength water-insoluble mortar material 100.
Mortar 40 in which 10 parts by weight of water and 10 to 50 parts by weight of water are kneaded.
A bubble 60 prepared from a foaming agent and water is contained in 0 to 600 parts by volume.
The method for producing a water-permeable cellular mortar according to claim 1, wherein the mortar is produced by mixing 0 to 400 parts by volume. 3. A method for producing a water-permeable cellular mortar, which comprises simultaneously kneading a foaming agent and water into a fast-strength water-insoluble separable mortar material containing ultra-fast-hardening cement, fine aggregate and a thickener. , Said manufacturing method. 4. An early-strength water-insoluble separable mortar material 100.
Mortar 400- consisting of 10 parts by weight of water and 10 to 50 parts by weight of water
The method for producing a water-permeable foam mortar according to claim 3, wherein adjustment is made such that bubbles are 600 to 400 parts by volume with respect to 600 parts by volume. 5. A water-permeable cellular mortar produced by the production method according to claim 1. 6. The cured product has a water permeability of 1 × 10 ⁻⁴ cm /
The permeable mortar according to claim 5, wherein the mortar is not less than sec. 7. The method according to claim 1, wherein the flow has a fluidity of 170 or more, the compressive strength after 3 hours of kneading is 1 kgf / cm ² or more, and the specific gravity is 1.2 or less. The permeable mortar according to claim 5 or 6. 8. A fast-strength water-insoluble mortar material for use in the production method according to claim 1, further comprising a setting retarder and a high-performance water reducing agent. Said mortar material. 9. 100 parts by weight of super-hardened cement, fine aggregate 2
00 to 500 parts by weight, a setting retarder 0.05 to 5 parts by weight,
High performance water reducing agent 0.05-2 parts by weight and thickener 0.05-
The mortar material according to claim 8, comprising 2 parts by weight. 10. The ultra-rapid hardening cement is C ₁₁ A ₇ · Ca
That the F ₂ as a main _{component, C 12 A 7, C 3} A, those mainly composed of calcium aluminate heat treatment and crushing was cement and gypsum, etc. represented by the _CA or the like, and the early-strength cement and ordinary cement Heat treatment of calcium aluminate
9. One or two or more kinds selected from a mixture of 10 to 20 parts by weight of a ground product.
Or the mortar material according to claim 9. 11. The method according to claim 8, wherein the fine aggregate is at least one selected from river sand, crushed sand, blast furnace slag crushed sand and silica sand. The described mortar material. 12. The setting retarder is one or more selected from citric acid, gluconic acid, tartaric acid, malic acid and salts thereof, sodium carbonate, potassium carbonate, and sodium bicarbonate. The mortar material according to any one of claims 8 to 11, which is characterized in that: 13. The high-performance water reducing agent is one or two selected from a polycarboxylate polymer compound, an alkyl allyl sulfonate, a naphthalene sulfonate formalin condensate and a melamine sulfonate formalin condensate. The mortar material according to any one of claims 8 to 12, wherein the mortar material is at least one kind. 14. A thickening agent comprising methylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, hydroxyethylmethylcellulose, hydroxypropylmethylcellulose, hydroxyethylethylcellulose, polyacrylamide, a copolymer of polyacrylamide and sodium acrylate, and polyacrylamide partially hydrolyzed. The mortar material according to any one of claims 8 to 13, wherein the mortar material is at least one selected from decomposed products. 15. A foaming agent used in the method for producing a water-permeable foam mortar according to any one of claims 1 to 4, comprising a higher alkyl ether sulfate, sodium alkylbenzene sulfonate, rosin soap, It is characterized by being one or more selected from anionic surfactants such as maleated rosin soap, polyethylene glycol type nonionic surfactants, amino acid type amphoteric surfactants and protein foaming agents. The foaming agent.