JP6234748B2 - Continuous kneading method using super-hard hard grout material - Google Patents

Description

  The present invention relates to a continuous kneading method using a super-fast hard grout material mainly used in the civil engineering and construction industries.

When aiming for streamlined construction, super-fluid grout mortar with super-hardness and self-filling and self-leveling properties is often required, and super-fast-hard grout mortar that exhibits practical strength in a short time after mixing has been proposed. (Patent Documents 1, 2, and 3).
In addition, when a large amount of grout mortar is to be constructed, a mortar mixer with a normal capacity of about 100 liters is kneaded for at least 1 minute, discharged to the hopper, and then pumped to the construction site via a mortar hose with a squeeze pump or the like. Done in
However, when super-hard grout mortar is applied in this way, super-hard grout mortar usually hardens within 1 hour. For example, when a trouble such as a machine failure occurs, the mortar in the mixer or hopper hardens. Or by mixing the old mortar that has just adhered to the mixer and the new mortar that has just been kneaded, the setting of the new mortar is promoted and the pot life cannot be secured. It takes time to weigh and knead with a mixer, so there is a problem that the mortar hardens during that time and it becomes impossible to install it, so it can not be efficiently mass-produced, and even if super fast hard grout mortar is used, it will not be rationalized construction There was a problem.
On the other hand, there has also been proposed an apparatus capable of continuously producing mortar from a raw material powder for mortar and water and quickly applying a large amount of grout mortar (Patent Documents 4 and 5).
However, this device takes a long time to knead until high fluidity is obtained. If the grout material has poor kneadability, high fluidity cannot be obtained unless the amount of kneading water is increased. May occur and strength development will deteriorate, and cannot be used. Furthermore, even with this device, if the construction is continued for a long time, the mortar that remains attached to the pump or the like will be hardened and cannot be pumped. There was also a problem of not being.

Japanese Patent Laid-Open No. 03-12350 Japanese Patent Laid-Open No. 01-230455 Japanese Patent Laid-Open No. 11-139859 JP 2007-33165 A JP 2007-245596 A

  Therefore, the present inventor has made various efforts to solve the above problems, and as a result, by combining a specific material with a specific device, the ultra-high speed hardness excellent in fluidity, non-shrinkage, and strength development for 3 hours. A grout material was obtained, it was excellent in kneadability, and it was found that an ultrafast hard grout mortar could be manufactured and pumped quickly, enabling efficient mass construction, and the present invention was completed.

The present invention
(1) Portland cement, calcium aluminate having a CaO / Al ₂ O ₃ molar ratio of 0.75 to 1.5, anhydrous gypsum, and calcium sulfoaluminate having a Blaine specific surface area value of 7500 cm ² / g or more. It contains a system expansion material, silica fume, calcium hydroxide, lithium carbonate, alkali metal carbonate other than lithium carbonate, organic acid, fluidizing agent, gas foaming material, and fine aggregate. Ultra-fast hard grout material is automatically supplied to the mortar mixer, and with the stirring blade provided at the tip of the mixer, it is kneaded with the injected water to produce ultra-fast hard grout mortar, which is connected to the tip of the mixer. Continuous kneading using super fast hard grout material, characterized by using a continuous kneading system that continuously pumps mortar with a snake-type pump Engineering method,
(2) Portland cement, calcium aluminate, anhydrous gypsum, expansive material, silica fume, calcium hydroxide and lithium carbonate in a total of 100 parts of binder, 30-50 parts of Portland cement, calcium aluminate 20 to 40 parts, 10 to 30 parts of anhydrous gypsum, 1 to 10 parts of expansion material, 1 to 10 parts of silica fume, 1 to 10 parts of calcium hydroxide, and 0.3 to 2 parts of lithium carbonate. 1) Continuous kneading method using super hard grout material of 1)
(3) For a total of 100 parts of the binder composed of Portland cement, calcium aluminate, anhydrous gypsum, expanded material, silica fume, calcium hydroxide, and lithium carbonate, which are super fast hard grout materials, alkali metal carbonates other than lithium carbonate are present. 0.05 to 5 parts, organic acid 0.03 to 2 parts, fluidizing agent 0.1 to 1.5 parts, gas foaming material 0.05 to 0.2 parts, fine aggregate 80 to 130 A continuous kneading method using the super fast hard grout material of (1) or (2) which is a part,
(4) The continuous kneading construction method using the super-fast hard grout material according to any one of (1) to (3), wherein the anhydrous gypsum of the super-hard hard grout material is acidic anhydrous gypsum,
(5) The continuous kneading construction method using the ultrafast hard grout material according to any one of (1) to (4), wherein the silica fume of the ultrafast hard grout material is acidic silica fume,
(6) A continuous kneading method using the super-fast hard grout material according to any one of (1) to (5), wherein the gas foam material of the super-hard hard grout material is percarbonate.
(7) The continuous kneading system automatically flows cleaning water into the pump when mortar pumping is interrupted or stopped, and the cleaning water is externally introduced by an automatic valve installed in front of the hose so that the cleaning water is not mixed with the pumping mortar. A continuous kneading method using the super-hard hard grout material according to any one of (1) to (6),
It is.

  According to the present invention, a super fast hard grout mortar that has high fluidity and non-shrinkage and that develops a practical strength in 3 hours can be applied in large quantities without any problems, so that cold areas and early release are particularly required. It is the most suitable construction method for large-scale grout construction.

Hereinafter, the present invention will be described in detail.
In addition, unless otherwise indicated, the part and% in this invention are shown by a mass reference | standard.

  The Portland cement of the present invention is not particularly limited, but various portland cements defined in JIS R 5210, various mixed cements defined in JIS R 5211, JIS R 5212, and JIS R 5213, JIS One or two or more types selected from filler cement mixed with blast furnace cement, fly ash cement, silica cement, limestone powder and the like manufactured at the admixture mixing rate specified in the above.

The calcium aluminate of the present invention is a general term for compounds mainly composed of CaO and Al ₂ O ₃ . In the present invention, calcium aluminate having a CaO / Al ₂ O ₃ molar ratio of 0.75 to 1.5 is used. Calcium Examples of aluminate, for _{example, CaO · 2Al 2 O 3,} CaO · Al 2 O 3, 12CaO · 7Al 2 O 3, 11CaO · 7Al 2 O 3 · CaF 2, 3CaO · 3Al 2 O 3 · CaSO Examples thereof include crystalline calcium aluminates represented as _{4 and the} like, and amorphous compounds mainly composed of CaO and Al ₂ O ₃ components. If the CaO / Al ₂ O ₃ molar ratio is less than 0.75, sufficient strength development cannot be obtained. Conversely, if the CaO / Al ₂ O ₃ molar ratio exceeds 1.5, sufficient fluidity and pot life cannot be obtained.

Examples of a method for obtaining calcium aluminate include a method in which a CaO raw material and an Al ₂ O ₃ raw material are heat-treated with a rotary kiln or an electric furnace. Examples of the CaO raw material for producing calcium aluminate include calcium carbonate such as limestone and shells, calcium hydroxide such as slaked lime, and calcium oxide such as quick lime. As the Al ₂ O ₃ raw material, for example, other industrial products, called bauxite, aluminum residual ash, include aluminum powder and the like.
When calcium aluminate is obtained industrially, impurities may be contained. Specific examples _{thereof, SiO 2, Fe 2 O 3} , MgO, TiO 2, MnO, Na 2 O, K 2 O, Li 2 O, S, like P 2 _{O 5,} and F or the like. The presence of these impurities is not particularly problematic as long as the object of the present invention is not substantially impaired. Specifically, there is no particular problem if the total of these impurities is in the range of 10% or less.

Calcium The compounds of _{aluminate, 4CaO · Al 2 O 3 ·} Fe 2 O 3, 6CaO · 2Al 2 O 3 · Fe 2 O 3, calcium such as _{6CaO · Al 2 O 3 · 2Fe} 2 O 3 alumino ferrite, 2CaO Calcium ferrite such as Fe ₂ O ₃ and CaO · Fe ₂ O ₃ , calcium aluminosilicate such as galenite 2CaO · Al ₂ O ₃ · SiO ₂ , anorsite CaO · Al ₂ O ₃ · 2SiO ₂ , melvinite 3CaO · MgO · 2SiO _2, Akerumanaito 2CaO · MgO · 2SiO _2, Monch celite CaO · MgO · SiO ₂ such as calcium magnesium silicate, tri-calcium silicate 3CaO · SiO _2, dicalcium silicate 2CaO · SiO _2, rankinite night 3CaO Sometimes 2SiO _2, calcium silicates, such as wollastonite CaO · SiO _2, calcium titanate CaO · TiO _2, free lime, leucite _{(K 2 O, Na 2 O} ) a · _{Al 2} O 3 · SiO 2, etc. . In the present invention, these crystalline or amorphous materials may be mixed.

The particle size of the calcium aluminate of the present invention is not particularly limited, but is usually in the range of 3000 to 9000 cm ² / g in terms of Blaine specific surface area, and more preferably about 4000 to 80000 cm ² / g. If it is less than 3000 cm ² / g, strength development may not be sufficient, and if it exceeds 9000 cm ² / g, it may be difficult to ensure fluidity and pot life.

The anhydrous gypsum of the present invention is not particularly limited, but it is preferable to use type II anhydrous gypsum, among which it is possible to use acidic anhydrous gypsum having a pH of 4.5 or less. This is preferable because it is easy to ensure the strength and the subsequent strength enhancement is good. Here, the pH of anhydrous gypsum means the pH of the supernatant when 1 g of anhydrous gypsum is added to 100 cc of pure water and stirred.
The particle size of the anhydrous gypsum is preferably 3000~9000cm ² / g in Blaine specific surface area, 4000~8000cm ² / g is more preferable.

The expansion material of the present invention is used to suppress bleeding of mortar that has not yet solidified, in addition to the effect of reducing shrinkage of the cured body, and includes calcium sulfoaluminate-based expansion material, calcium aluminoferrite-based expansion material, lime-based material Although an expansion material, a gypsum type expansion material, etc. are mentioned, in this invention, the calcium sulfo aluminate type expansion material excellent in the bleeding suppression effect is used.
Calcium sulfoaluminate-based expansion material is a general mixture of CaO raw material, Al ₂ O ₃ raw material, Fe ₂ O ₃ raw material, and CaSO ₄ raw material in a predetermined ratio, using an electric furnace, rotary kiln, etc. Specifically, it is manufactured by heat treatment at 1100-1600 ° C. When the heat treatment temperature is less than 1100 ° C., the obtained expansion material may not have sufficient expansion performance, and when it exceeds 1600 ° C., anhydrous gypsum may decompose.
The CaO feed, limestone or slaked lime or the _like, the two are for Al 2 _{O 3} raw material bauxite, aluminum residual ash and the like, _Fe 2 _{O 3} as the raw material of copper Karami and commercial iron oxide and the like, and as CaSO ₄ material Examples thereof include water gypsum, hemihydrate gypsum, and anhydrous gypsum.
The fineness of the expansion material is preferably 7500 cm ² / g or more in terms of Blaine specific surface area. If it is less than 7500 cm ² / g, the occurrence of bleeding cannot be suppressed.

The silica fume of the present invention is used for high fluidization and improvement of long-term strength development. In the present invention, acidic silica fume excellent in high fluidization effect is used.
The acidic silica fume is a silica fume exhibiting acidity in which the pH of the supernatant liquid is 5.0 or less when 1 g of silica fume is put in 100 cc of pure water and stirred. Among acidic silica fume, silica fume containing zirconium oxide is preferable in terms of obtaining excellent fluidity.
Silica fume containing zirconium oxide is produced, for example, by the following steps. First, in an electric furnace, the zircon sand is electrofused to approximately 2200 ° C., the zircon sand fine particles have an average particle size of approximately 1 μm, is stabilized substantially uniformly, and the fusing temperature is stepped to prevent secondary agglomeration. To rise. Next, a plurality of predetermined cyclones are connected in series to remove coarse particles, and after the particles are collected, they are stirred again in the silo to reduce the variation in particle size. The silica fume containing zirconium oxide produced in this way is likely to have a particle size that is approximately 2 to 10 times larger than that of silica fume that is conventionally used, for example, by-produced during the production of ferrosilicon. The content of zirconium oxide in the silica fume containing zirconium oxide is preferably 1 to 10%, and more preferably 3 to 6%.
The fineness of the siliceous fine powder is not particularly limited, but it is usually preferably 8 to ²⁰⁰ m ² / g in terms of BET specific surface area. However, the silica fume containing zirconium oxide is preferably 8 to 13 m ² / g.

The calcium hydroxide of the present invention is not particularly limited. This is a general term for compounds represented by Ca (OH) ₂ . The impurities are not particularly limited as long as they do not contain harmful substances for the environment. The Ca (OH) ₂ content is preferably 80% or more, more preferably 90% or more. Impurities may include calcium carbonate and calcium oxide.
Fineness of calcium hydroxide, is not particularly limited, preferably ^{20 m} 2 / g or less in BET surface area values, ^{15 m} 2 / g or less is more preferable. When the BET area value of calcium hydroxide exceeds 20 m ² / g, the fluidity tends to deteriorate or it becomes difficult to ensure the pot life.

The lithium carbonate of the present invention plays a role of promoting hardening of calcium aluminate and realizing strength development in a short time.
Lithium salts other than lithium carbonate are known to accelerate the hardening of calcium aluminate, but when lithium salts other than lithium carbonate are used, they cannot be fluidized and the pot life is secured. Can not.

Alkali metal carbonates other than lithium carbonate of the present invention play an important role in achieving high fluidization and securing the pot life.
The alkali metal carbonate is not particularly limited, and specific examples thereof include sodium carbonate, potassium carbonate, ammonium carbonate, sodium bicarbonate, potassium bicarbonate, ammonium bicarbonate and the like.

The organic acid of the present invention plays an important role in securing fluidization and pot life together with carbonates and fluidizing agents.
The organic acid is not particularly limited, but specific examples thereof include, for example, oxycarboxylic acids such as citric acid, tartaric acid, malic acid, gluconic acid, succinic acid, and their sodium, potassium, calcium, magnesium, Examples thereof include salts such as ammonium and aluminum. Of these, citric acid and its salts are preferred. In the present invention, one or more of these can be used in combination.

The fluidizing agent of the present invention facilitates kneading of materials, helps disperse each material, and plays a role of imparting fluidity of the kneaded material.
The fluidizing agent is not particularly limited, and specific examples thereof include naphthalene sulfonic acid water reducing agents, melamine sulfonic acid water reducing agents, lignin sulfonic acid water reducing agents, and polycarboxylic acid water reducing agents. For example, liquid or powder can be used as the water reducing agent, but powder is preferred when used as a premix product.

The gas foaming material of the present invention is used for the purpose of preventing the mortar that has not yet solidified from sinking or shrinking in order to integrate the grout mortar and the structure when grout construction is performed.
Specific examples of the gas foaming substance include, for example, aluminum powder surface-treated with vegetable oil, mineral oil, stearic acid, etc., nitrogen powder such as azo compound, nitroso compound, and hydrazine derivative in addition to aluminum powder, aluminum powder and carbon material. Examples thereof include foaming substances, and peroxidic substances such as percarbonate, persulfate, perborate and permanganate.
In the present invention, it is preferable to use a peroxide substance such as percarbonate, persulfate, perborate, and permanganate because the effect of suppressing settlement is large. Of these, the use of percarbonate is most preferable.

The fine aggregate of the present invention plays an important role from the viewpoint of reducing calorific value and dimensional change and ensuring durability.
Specific examples of the fine aggregate are classified into, for example, a silica sand system, a limestone system, a blast furnace granulated slag system, and a recycled aggregate system. Those dry sands are preferred when used as premix products.

The blending ratio of each raw material in the ultrafast hard grout material of the present invention is that Portland cement is a total of 100 parts of Portland cement and a binder composed of calcium aluminate, anhydrous gypsum, expanded material, silica fume, calcium hydroxide and lithium carbonate. 30-50 parts, calcium aluminate 20-40 parts, anhydrous gypsum 10-30 parts, expansion material 1-10 parts, silica fume 1-10 parts, calcium hydroxide 1-10 parts, lithium carbonate 0. It is preferably 3 to 2 parts.
If the Portland cement is less than 30 parts, it may be difficult to secure the pot life or long-term durability may be difficult to obtain. On the other hand, when it exceeds 50 parts, there are cases where excellent initial strength development properties cannot be obtained.
If the calcium aluminate is less than 20 parts, excellent initial strength development may not be obtained. If the calcium aluminate is used in excess of 40 parts, it may be difficult to ensure the pot life or long-term durability may not be obtained. There is.
If the amount of anhydrous gypsum is less than 10 parts, it may be difficult to ensure the pot life, and if it exceeds 30 parts, it may overexpand and the strength may decrease.
If the expansion material is less than 1 part, bleeding may occur. If the expansion material exceeds 10 parts, overexpansion may occur and the strength may decrease.
If the silica fume is less than 1 part, sufficient fluidity may not be obtained, and excellent long-term strength development may not be obtained. If more than 10 parts, sufficient fluidity cannot be obtained, or excellent. The initial strength development may not be obtained.
If calcium hydroxide is less than 1 part, sufficient initial strength development may not be obtained, and if it exceeds 10 parts, it may be difficult to ensure pot life.
If the lithium carbonate is less than 0.3 part, sufficient initial strength development may not be obtained, and if it exceeds 2 parts, further enhancement of the effect cannot be expected.

Moreover, 0.05 to 5 parts of alkali metal carbonate other than lithium carbonate, 0.03 to 2 parts of organic acid, and 0.1 to 1.5 parts of fluidizing agent for 100 parts in total of the binder The gas foaming material is preferably 0.05 to 0.2 part, and the fine aggregate is preferably 80 to 130 part.
If the alkali metal carbonate other than lithium carbonate is less than 0.05 parts, sufficient fluidity may not be obtained or it may be difficult to ensure the pot life, and if it exceeds 5 parts, the setting delay increases. In some cases, sufficient initial strength cannot be obtained.
If the organic acid is less than 0.03 part, it may be difficult to ensure the pot life, and if it exceeds 2 parts, the setting delay may be increased, and sufficient initial strength development may not be obtained. If the fluidizing agent is less than 0.1 part, sufficient fluidity may not be obtained, and if it exceeds 1.5 part, material separation may occur.
If the gas foaming material is less than 0.05 part, there may be cases where sufficient settlement suppression effect may not be obtained, and if it exceeds 0.2 part, expansion due to foaming becomes too large and sufficient strength development may not be obtained. is there.
If the fine aggregate is less than 80 parts, shrinkage of the hardened body may increase and cracks may occur, and if it exceeds 130 parts, sufficient strength development may not be obtained.

The continuous kneading system used in the present invention automatically supplies super fast hard grouting material to the mortar mixer, and kneads it with the water that has been press-fitted with the stirring blade provided at the tip of the mixer to produce super fast hard grouting mortar. The mortar is continuously pumped by a snake type pump connected to the tip of the mixer. An example of such a construction apparatus is a G4 continuous mixer pump manufactured by German PFT.
In the present invention, in a continuous kneading system, washing water is automatically flowed into the pump when the mortar pressure feeding is interrupted or stopped, and the washing water is washed outside by an automatic valve installed in front of the hose so that the washing water is not mixed with the pressure feeding mortar. Since the system can discharge water, the work efficiency is good, and the washing water is not mixed with the pressure-feed mortar and the physical properties are not deteriorated.

  The amount of water added is not particularly limited because it varies depending on the purpose of use, application, and the blending ratio of each raw material, but it is usually preferably 15% to 20% in terms of water / material ratio. If it is less than 15%, sufficient fluidity may not be obtained, and if it exceeds 20%, sufficient strength development may not be obtained.

Ultra rapid-grouting material of the present invention, the water regulating valve construction apparatus of the present invention, combined with fluid mortar in the range of 8 ± 2 seconds J ₁₄ funnel under a stream value, water / material ratio of 15% to 20 % Of the preferred range.

  Hereinafter, it demonstrates in detail in an experiment example.

"Experiment 1"
A binder comprising 40 parts of cement, 20 parts of anhydrous gypsum (a), 2 parts of inflating material (α), 3 parts of silica fume (I), 4 parts of calcium hydroxide, 1 part of lithium carbonate and calcium aluminate shown in Table 1. Prepared, with respect to 100 parts of the binder, 1.5 parts of an alkali metal carbonate other than lithium carbonate, 0.5 parts of an organic acid, 0.5 parts of a fluidizing agent, 0.1 part of a gas foaming substance (ii), An ultrafast hard grout material was prepared by blending 100 parts of fine aggregate.
This super-fast hard grout material is automatically supplied to the mortar mixer using a continuous kneading system, and the super-hard hard grout mortar is manufactured by mixing with the injected water with the stirring blade provided at the tip of the mixer. the mortar was pumped by snake-type pump that is connected to the tip of the mixer, the flow when the fluidity of the hose destination mortar combined water so that the range of 8 ± 2 seconds J ₁₄ funnel falling value The properties, pot life and compressive strength were measured. The results are also shown in Table 1.

<Materials used>
Cement: ordinary Portland cement, commercially available calcium aluminate (A): CaO / Al ₂ O ₃ molar ratio 0.75, crystalline, CaO · Al ₂ O ₃ and CaO · 2Al ₂ O ₃ as main components, Blaine specific surface area 5000 cm ² / g
Calcium aluminate (B): CaO / Al ₂ O ₃ molar ratio 1.00, crystalline, CaO · Al ₂ O ₃ as the main component, Blaine specific surface area 5000 cm ² / g
Calcium aluminate (C): CaO / Al ₂ O ₃ molar ratio 1.50, crystalline, CaO · Al ₂ O ₃ and 12CaO · 7Al ₂ O ₃ as main components, Blaine specific surface area 5000 cm ² / g
Calcium aluminate (D): CaO / Al ₂ O ₃ molar ratio 1.00, amorphous, 5% of reagent grade silica is added to calcium aluminate B, melted at 1650 ° C., and then rapidly cooled. Synthesis, Blaine specific surface area 5000 cm ² / g
Calcium aluminate (E): CaO / Al ₂ O ₃ molar ratio 1.50, amorphous, calcium aluminate C 3% of first grade silica was added, melted at 1650 ° C., and then rapidly cooled. Synthesis, Blaine specific surface area 5000 cm ² / g
Calcium aluminate (F): CaO / Al ₂ O ₃ molar ratio 0.60, crystalline, CaO · Al ₂ O ₃ and CaO · 2Al ₂ O ₃ as main components, Blaine specific surface area 5000 cm ² / g
Calcium aluminate (G): CaO / Al ₂ O ₃ molar ratio 1.60, crystalline, CaO · Al ₂ O ₃ and 12CaO · 7Al ₂ O ₃ as main components, Blaine specific surface area 5000 cm ² / g
Anhydrous gypsum: type II anhydrous gypsum, PH 3.0, Blaine specific surface area 5000 cm ² / g
Expansion material (α): calcium sulfoaluminate-based expansion material, commercially available product, Blaine specific surface area of 9000 cm ² / g
Silica fume (I): silica fume containing zirconium oxide, commercially available products, content of 5% zirconium oxide, BET surface area value ^12m 2 ^/g,pH3.0, commercially calcium hydroxide: BET area value ^{10 m} 2 / g, commercially available Product Lithium carbonate: Reagent grade 1, Alkaline metal carbonate other than commercial product: Potassium carbonate, Reagent grade 1, Commercial product Organic acid: Tartaric acid, Reagent grade 1, Commercial fluidizer: Naphthalenesulfonic acid water reducing agent, Powder, commercially available gas foaming substance (I): sodium percarbonate, reagent grade 1, commercially available fine aggregate: limestone, maximum particle size 4 mm, commercially available product

<Use machine>
Continuous kneading system (1): G4 continuous mixer pump, with automatic washing water discharge system installed by PFT, Germany.

<Test method>
Flowability: Based on JSCE-F541. J ₁₄ funnel flow downside pot life was measured by mortar temperature. Mortar was collected in a cup, and the time when the temperature rose by 2 ° C. from the kneading temperature was defined as the pot life.
Compressive strength: Based on JSCE-G505. Specimen size φ50 × 100mm, material age 3 hours, 28 days

From Table 1, it can be seen that the ultrafast hard grout material of the present invention is excellent in fluidity, can secure a sufficient pot life, and has good strength development.

"Experimental example 2"
The test was conducted in the same manner as in Experimental Example 1 except that 30 parts of calcium aluminate (A) was used and 100 parts of the binder was mixed with the anhydrous anthracite in the amount shown in Table 2. The results are also shown in Table 2.

From Table 2, it can be seen that the ultrafast hard grout material of the present invention can secure a sufficient pot life and has good strength development.

"Experiment 3"
30 parts of calcium aluminate (A) was used, 2 parts of the expansion material shown in Table 3 was blended in 100 parts of the binding material, and the bleeding rate was measured. The results are also shown in Table 2.

<Materials used>
Expansion material (β): calcium sulfoaluminate-based expansion material, Blaine specific surface area of 3000 cm ² / g
Expansion material (γ): calcium aluminoferrite-based expansion material, Blaine specific surface area 9000 cm ² / g, commercial product expansion material (δ): lime-based expansion material, Blaine specific surface area 9000 cm ² / g
Expansion material (ε): gypsum-based expansion material, Blaine specific surface area 9000 cm ² / g

<Test method>
Bleeding rate: Conforms to JSCE-F542.

From Table 3, it can be seen that the ultra-fast hard grout material of the present invention is excellent in bleeding suppression effect.

"Experimental example 4"
The experiment was performed in the same manner as in Experimental Example 1 except that 30 parts of calcium aluminate (A) was used and 3 parts of silica fume shown in Table 4 was blended in 100 parts of the binder. The results are also shown in Table 4.

<Materials used>
Silica fume (II): Silica fume produced as a by-product during ferrosilicon production, BET area 19 m ² / g, commercial product

From Table 4, it can be seen that the ultrafast hard grout material of the present invention is excellent in fluidity.

“Experimental Example 5”
The test was conducted in the same manner as in Experimental Example 1 except that 30 parts of calcium aluminate (A) was used, the gas foaming substances shown in Table 5 were blended in 100 parts of the binder, and the expansion / contraction rate was measured. The results are also shown in Table 5.

<Materials used>
Gas foaming material (b): sodium perborate, reagent grade 1, commercial gas foaming material (c): aluminum powder, commercial gas foaming material (d): fluid coke, commercial gas foaming material (e): azo Dicarbonamide, commercial product <Test method>
Expansion / shrinkage ratio: compliant with JSCE-F 542.

From Table 5, it can be seen that the super-hard hard grout material of the present invention is excellent in the effect of inhibiting the mortar that has not yet hardened from sinking or shrinking.

"Experimental example 6"
It was carried out in the same manner as in Experimental Example 1 except that 30 parts of calcium aluminate (A) was used and calcium hydroxide and lithium carbonate in the amounts shown in Table 6 were blended in 100 parts of the binder. The results are also shown in Table 6.

From Table 6, it can be seen that the ultrafast hard grout material of the present invention can secure a sufficient pot life and has good initial strength development.

"Experimental example 7"
Using 30 parts of calcium aluminate (A), the binder 100 is blended with an alkali metal carbonate other than lithium carbonate, an organic acid, a fluidizing agent, and fine aggregates in the amounts shown in Table 7. The experiment was performed in the same manner as in Experimental Example 1 except that the change rate was measured. The results are also shown in Table 7.

<Test method>
Length change rate: compliant with JIS A 1129-3. Age 28 days.

From Table 7, the ultra-fast hard grout material of the present invention is excellent in fluidity, can secure a sufficient pot life, has good initial strength, has a small amount of drying shrinkage, and has excellent crack resistance. I understand.

"Experimental example 8"
A binder comprising 40 parts of cement, 30 parts of calcium aluminate (A), 20 parts of anhydrous gypsum (a), 2 parts of expansion material (α), 3 parts of silica fume (I), 4 parts of calcium hydroxide and 1 part of lithium carbonate. And 1.5 parts of alkali metal carbonate other than lithium carbonate, 0.5 parts of organic acid, 0.5 parts of fluidizing agent, 0.1 part of gas foaming substance (ii) with respect to 100 parts of binder. Then, 100 parts of fine aggregate was blended to prepare an ultrafast hard grout material. When 17.5 parts of water is added to 100 parts of this super hard grout material and kneaded with a hand mixer, and using a continuous kneading system, the super fast hard grout material is automatically supplied to the mortar mixer. A stirring blade provided at the tip of the mixer is used to produce ultra-fast hard grout mortar by mixing with the water that has been injected, and the mortar is pumped by a snake-type pump connected to the tip of the mixer. when the fluidity of the mortar were combined amount of water so that the range of 8 ± 2 seconds J ₁₄ funnel falling values, flowability, unit volume mass, the pot life and compressive strength were measured. The results are shown in Table 8.
When a continuous kneading system was used, the discharge rate per hour of the mortar at the hose tip was also measured. The results are also shown in Table 8.

<Test method>
Unit volume mass: Conforms to JIS A 1116.
Mortar discharge amount: During mortar pumping, the hose tip was inserted into a 20-liter pail and time measurement with a stopwatch started. Remove the hose after 15 seconds and measure the mortar mass in the pail. The mortar discharge amount per hour was calculated by the following formula.
Mortar discharge rate (m ³ / hr) = mortar mass per 15 seconds (kg) x 4 x 60 ÷ unit volume mass (t / m ³ ) ÷ 1000

From Table 8, the continuous kneading system of the present invention, the amount of water regulating valve, are combined fluid mortar in the range of 8 ± 2 seconds J ₁₄ funnel under a stream value, unit volume weight of the case batch kneading by hand mixer Therefore, it can be considered that they are kneaded at the same water / material ratio, and the pot life and compressive strength are equivalent.
Also, it can be seen that ultra-fast hard grout mortar showing the same performance as that of batch kneading can discharge a large volume of 2 m ³ per hour and can be applied quickly.

"Experimental example 9"
The test was carried out in the same manner as in Experimental Example 8 except that the mortar was continuously pumped using a continuous kneading system equipped with an automatic washing water discharge system, and the workability was confirmed by repeating interruption and stopping for 5 minutes 10 times. The results are shown in Table 9.

<Use machine>
Continuous kneading system (2): G4 continuous mixer pump, manufactured by PFT, Germany, without automatic washing water discharge system

From Table 9, it can be seen that the continuous kneading system of the present invention is provided with an automatic washing water discharge system, so that problems such as blockage of the pump hardly occur even if it is not stopped and washed during continuous operation.

The continuous kneading construction method using the ultra-fast hard grout material of the present invention has high fluidity, no shrinkage, and can be applied in large quantities quickly and without problems with ultra-fast hard grout mortar that expresses practical strength in 3 hours. Since it can be applied particularly to cold districts and large-scale grout construction that requires early release, it is preferably used in the civil engineering and construction fields.

Claims (5)

Portland cement, calcium aluminate having a CaO / Al ₂ O ₃ molar ratio of 0.75 to 1.5, anhydrous gypsum, and a calcium sulfoaluminate-based expansion material having a brain specific surface area value of 7500 cm ² / g or more And a binder composed of silica fume, calcium hydroxide, and lithium carbonate,
In a total of 100 parts of the binder, 20 parts or more of calcium aluminate, 1 to 10 parts of silica fume, 1 part or more of calcium hydroxide, 0.3 part or more of lithium carbonate,
The silica fume is acidic silica fume,
For 100 parts of the binder , an alkali metal carbonate other than 0.05 to 5 parts of lithium carbonate, 2 parts or less of an organic acid, 0.1 parts or more of a fluidizing agent, a gas foaming substance, The ultra-fast hard grout material containing fine aggregate is automatically supplied to the mortar mixer, and it is kneaded with the injected water with the stirring blade provided at the tip of the mixer to produce the ultra-fast hard grout mortar. Using a continuous kneading system that produces and continuously pumps mortar with a snake-type pump connected to the tip of the mixer ,
The continuous kneading system automatically flows cleaning water into the pump when mortar pumping is interrupted or stopped, and the cleaning water is discharged to the outside by an automatic valve installed in front of the hose so that the cleaning water is not mixed with the pumping mortar. A continuous kneading method using a super-fast hard grout material, characterized in that the system has a function capable of being performed .   Portland cement, super alumina cement, calcium aluminate, anhydrous gypsum, expansive material, silica fume, calcium hydroxide and lithium carbonate in 100 parts in total, Portland cement is 30-50 parts, calcium aluminate is 20- 40 parts, 10-30 parts of anhydrous gypsum, 1-10 parts of inflating material, 1-10 parts of silica fume, 1-10 parts of calcium hydroxide, 0.3-2 parts of lithium carbonate, A continuous kneading method using the described ultra-fast hard grout material.   0.05 parts of alkali metal carbonate other than lithium carbonate is used for a total of 100 parts of binder composed of Portland cement, calcium aluminate, anhydrous gypsum, expanded material, silica fume, calcium hydroxide, and lithium carbonate, which are super-hard cemented grout materials. ~ 5 parts, organic acid 0.03 ~ 2 parts, fluidizing agent 0.1 ~ 1.5 parts, gas foaming material 0.05 ~ 0.2 parts, fine aggregate 80 ~ 130 parts. A continuous kneading method using the super-hard hard grout material according to claim 1 or 2.   The continuous kneading construction method using the super-fast hard grout material according to any one of claims 1 to 3, wherein the anhydrous gypsum of the super-fast hard grout material is acidic anhydrous gypsum. The continuous foaming construction method using the ultrafast hard grout material according to any one of claims 1 to 4 , wherein the gas foaming material of the ultrafast hard grout material is percarbonate.