KR101302475B1 - Quick setting agent and method for manufacturing thereof - Google Patents

Abstract

PURPOSE: A concrete accelerating agent is provided to secure liquid stability under oversaturation of aluminum oxide and sulfate ion, and to show excellent quick setting power, cohesive property and early strength by increased content of aluminum oxide and sulfate ion. CONSTITUTION: A manufacturing method of a concrete accelerating agent comprises the steps of: manufacturing aluminum hydroxide solution by dissolving a mixture comprising aluminum hydroxide in hydrofluoric acid (S1); manufacturing mixed solution of aluminum hydroxide and aluminum sulfate by dissolving aluminum sulfate in the aluminum hydroxide solution (S2); and controlling pH of the mixed solution and injecting a stabilizer (S3). In the step S1, sulfuric acid is more added when adding the hydrofluoric acid. The stabilizer is a reaction stabilizer for increasing reaction stability, and comprises amines. The stabilizer is an oversaturated liquid stabilizer for securing stability of the mixed solution, and comprises manesiums. The concrete accelerating agent comprises: 8-15 wt% of Al(OH)3; 0.1-0.5 wt% of phosphoric acid group; 16-18 wt% of HF; 1.5-2.5 wt% of magnesiums; and 20.30 wt% of water. [Reference numerals] (AA) Start; (BB) End; (S1) Dissolving hydrofluoric acid; (S2) Dissolving aluminum sulfate; (S3) Controlling pH and injecting a stabilizer

Description

QUICK SETTING AGENT AND METHOD FOR MANUFACTURING THEREOF}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fastener for shotcrete, which is a hardening work for placing concrete, and more particularly, to an alkali-free mineral liquid concrete fastener and a method for manufacturing the same.

In general, concrete has a needle crystal of Ettringite (3CaO · Al ₂ O ₃ · CaSO ₄ · 32H ₂ O) in the hydration reaction, and according to the type and content of each composition mixed in the concrete, High strength, expandability, etc. are different. In this case, when the content of alumina (Al ₂ O ₃ ) in the concrete mixture increases, the fastening force is increased, and when the content of sulfate ions (SO ₄ ^2- ) increases, the high strength property is excellent. Therefore, for the high performance of the concrete fastener, it is preferable to increase the content of alumina (Al ₂ O ₃ ) and sulfate ions (SO ₄ ^2- ).

Of these, in order to increase the content of alumina (Al ₂ O ₃ ) for squeezing power, pure aluminum sulfate and aluminum hydroxide are dissolved as much as possible to make aluminum oxide (eg, Al ₂ O ₃ ). and sulfate ion (SO ₄ ^2-) to the need to contain, in this way containing the aluminum oxide and the sulfate ion (SO ₄ ^2-) is unstable, aluminum oxide and sulfate ions hagieneun maintain liquid phase (SO ₄ ^2-) to component supersaturated There was a technical limitation in increasing the content of. For this reason, at present, concrete fasteners are manufactured and supplied in an amount of about 11 wt% aluminum oxide and about 18 wt% sulfate ions (SO ₄ ^2- ).

Therefore, there is a need for a technique capable of increasing the content of aluminum oxide and sulfate ions (SO ₄ ^2- ) in the concrete fastener by maintaining a stable liquid state of the supersaturated solution of aluminum sulfate and aluminum hydroxide even at low temperatures.

Related prior arts include Korean Patent No. 10-0858858 (registered date; September 10, 2008, title; spraying agent for spraying, spraying material, and spraying method using the same).

The present invention not only increased the content of aluminum oxide (Aluminum Oxide), which is an active ingredient exhibiting fastening power, but also secured liquid stability in the supersaturated state of aluminum oxide and sulfate ions (SO ₄ ^2- ), thereby providing excellent fastening power and It is to provide a concrete fastener and a method of manufacturing the same to secure the adhesion, excellent early strength.

The technical problems to be achieved by the present invention are not limited to the technical problems mentioned above.

Concrete filler according to an embodiment of the present invention for realizing the above object, in the alkali-free liquid concrete filler, 8-15wt% aluminum hydroxide (Al (OH) ₃ ), 0.1 _~ 0.5 wt% phosphoric acid, 16-18 wt% hydrofluoric acid (HF), 1.5-2.5 wt% sulfuric acid (H ₂ SO ₄ ), 30-45 wt% aluminum sulfate (Al ₂ (SO ₄ ) ₃ ), 1.5-3.5 wt% Sodium, 0.3 to 1.5 wt% amines, 3 to 5 wt% magnesium, and 20 to 30 wt% water may be included.

Specifically, the concentration of hydrofluoric acid may be 50 to 60wt%.

The concrete fastener may include an amount of alumina (Al ₂ O ₃ ), which is an effective ingredient of the fastening force, to 14 wt% or more.

The concrete fastener may include 20 wt% or more of sulfate ion (SO ₄ ^2- ) which is an active ingredient of fastening force.

In addition, the manufacturing method of the concrete fastener according to the embodiment of the present invention for realizing the above object, in the production of alkali-free mineral type liquid concrete fastener, a mixture containing aluminum hydroxide Dissolving in hydrofluoric acid to prepare an aluminum hydroxide solution (S1), dissolving aluminum sulfate in the aluminum hydroxide solution to prepare a mixed solution of aluminum hydroxide and aluminum sulfate (S2), and adjusting the pH of the mixed solution And adding a stabilizer (S3).

Specifically, the mixture may be made by mixing the aluminum hydroxide, phosphoric acid, sodium (sodium) and water.

The phosphoric acid may be composed of one or two or more selected from phosphorous acid, metaphosphoric acid, pyrophosphoric acid, and tetra-phosphate.

The sodium may be composed of one or two or more selected from sodium hydroxide (NaOH), sodium silicate (Na ₂ SiO ₃ ), and sodium sulfate (Na ₂ SO ₄ ).

In the step (S1), sulfuric acid may be further added to increase the dissolution of the aluminum hydroxide when the hydrofluoric acid is added.

The step (S1) may be performed by stirring at least 1 hour or more at a temperature of 100 ℃ or more.

The step (S2) may be performed by stirring at least 20 minutes or more at a temperature of 65 ℃ ~ 135 ℃.

PH control of the mixed solution may be performed by adding one or a mixture of two or more selected from caustic soda (NaOH), sodium silicate (Na ₂ SiO ₃ ), sodium sulfate (Na ₂ SO ₄ ).

The pH of the mixed solution may be adjusted to a value between 2.5 and 3.0.

The stabilizer may be composed of amines as a reaction stabilizer added to increase the stability of the coagulation reaction.

The amines may be composed of one or a mixture of two or more selected from diethanolamine, triethanolamine, methylethanolamine, ethylethanolamine, and monoethanolamine.

The stabilizer may be made of magnesium as a supersaturated liquid stabilizer added to ensure the stability of the mixed solution.

The magnesium may be made of one or a mixture of two or more selected from magnesium oxide, magnesium carbonate, magnesium sulfate, magnesium hydroxide, and magnesium peroxide.

As described above, the concrete fastener of the present invention increases the content of the active ingredient that plays the most important role in the fastener performance by applying a technique for stabilizing the fastener in the supersaturated state, thereby increasing the rebound amount by 20. It can be reduced below ~ 10%, and the amount of waste concrete generated is reduced by more than 50%, which is economical and environmentally friendly.

In addition, the concrete fastener of the present invention increases the content of Al ₂ O ₃ to improve the fastening power than the conventional fastening agent has the effect of having excellent fastening power even in a small amount of use.

In addition, the concrete fastener of the present invention increases the content of sulfate ions (SO ₄ ^2- ) has the effect of reducing the long-term strength decrease rate than the conventional fastener has the effect of producing high strength concrete.

In addition, the concrete fastener of the present invention is produced in a weak acidity has the effect of preventing the risk of worker burns, environmental pollution, leachate leakage and the like.

In addition, the concrete fastener of the present invention has the effect of reducing the content of Na + alkali metal ions to less than 1wt% to suppress the long-term strength decrease and long-term durability decrease by the alkali aggregate reaction of concrete.

In addition, the concrete fastener of the present invention is produced in a liquid form, easy to store and transport, there is an effect of reducing the amount of dust generated while reducing the harmfulness of the human body while increasing workability.

1 is a flow chart schematically showing a method for producing a concrete fastener of the present invention,
FIG. 2 is a graph illustrating a comparison of penetration resistance values between concrete fasteners prepared in FIG. 1 and conventional concrete fasteners.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Like elements in the figures are denoted by the same reference numerals wherever possible. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

In order to manufacture high-performance concrete fasteners, it is necessary to increase the content of the contained aluminum oxide and sulfate ions (SO ₄ ^2- ), but when they are contained in more than 11wt% and 20wt%, respectively, they become supersaturated. It is impossible to exist as a liquid at room temperature, and when the temperature is lowered during winter storage, it condenses even more severely, causing problems in use and storage. However, the prior art is difficult to increase the content of aluminum oxide and sulfate ions (SO ₄ ^2- ) above a certain limit.

Therefore, in order to improve this, the present invention will be disclosed in the present invention concrete quenching agent and the method of manufacturing the same by applying the technology for the ionic strength, dispersion technique using a chelate and complex compound more than twice as fast.

1 is a flow chart schematically showing a method for producing a concrete fastener of the present invention. Referring to FIG. 1, the concrete fastener of the present invention is prepared by dissolving aluminum hydroxide (S1), dissolving aluminum sulfate (S2), and adjusting the pH and adding a stabilizer (S3). do.

Dissolving aluminum hydroxide ( S1 )

Dissolution of aluminum hydroxide is prepared by first mixing aluminum hydroxide (Al (OH) ₃ ), phosphates, and sodium in water in a container such as a kneader. At this time, the mixed aluminum hydroxide (Al (OH) ₃ ) contains alumina (Al ₂ O ₃ ) which is an active ingredient of the fastening force and is a component involved in the degree of coagulation and curing of the concrete fastener. In particular, alumina (Al ₂ O ₃ ) component has a great influence on the initial coagulation force of the concrete fastener. Therefore, aluminum hydroxide (Al (OH) ₃ ) may be said to be a main component in the preparation of the concrete fastener.

In addition, the phosphates ensure stability and shelf life so that they can be used for a long time after the concrete fastener is manufactured. Phosphoric acids also help to increase the solubility of aluminum hydroxide. At this time, the addition of phosphoric acid is characterized by a large effect only by the addition of a small amount, the mixed phosphoric acid is phosphorous acid (phosphorous acid), metaphosphoric acid (metaphosphoric acid), pyrophosphoric acid, tetra-phosphate (tetra-phosphate) ) Or a mixture of two or more selected.

However, when the phosphate is excessively used in excess of an appropriate amount, the pH may be lowered to increase the content of sodium, that is, sodium ions (Na ⁺ ) to compensate for this.

At this time, the sodium to be mixed is input to adjust the pH of the mixture, it should be appropriate to be appropriately adjusted according to the amount of the phosphoric acid mixture. However, when the excessive input of concrete induces the alkali aggregate reaction, causing a problem in durability.

Next, hydrofluoric acid (HF) is added to the mixture thus prepared to dissolve aluminum hydroxide. In addition, when hydrofluoric acid is added, sulfuric acid (H ₂ SO ₄ ) may be further added to increase the solubility of aluminum hydroxide to completely dissolve the aluminum hydroxide. This is because, if the aluminum hydroxide is not completely dissolved, the pH is lowered and the stability of the prepared fastener is lowered. The reaction in which such aluminum hydroxide is dissolved in hydrofluoric acid and sulfuric acid may be carried out by transferring a container to a reaction tank or the like.

The hydrofluoric acid (HF) added at this time serves as a solvent for dissolving aluminum hydroxide. Hydrofluoric acid (HF) is used as a solvent because aluminum hydroxide is a strong alkali, because strong acid reacts best with hydrofluoric acid (HF). However, if the hydrofluoric acid is added in excess of the appropriate level, there is a risk of explosion, and if a small amount is added, it may not be reacted with aluminum hydroxide, so that dissolution may not be achieved.

And sulfuric acid added with hydrofluoric acid helps the large amount of aluminum hydroxide to dissolve better. However, excessive amounts of corrosion may cause the equipment to be corrosive or harmful to the manufacturer as a strongly acidic substance, so an appropriate amount should be adjusted to be added.

On the other hand, in the step (S1) may be mechanical stirring for uniform mixing and smooth dissolution, in this case it is good to perform the stirring for at least 1 hour. In addition, if the reaction temperature of step (S1) is maintained at 100 ℃ or more, the reaction in which aluminum hydroxide and phosphoric acid mixed with water is dissolved in hydrofluoric acid and sulfuric acid.

In addition, as a final process of step S1, the transparency of the aluminum hydroxide solution thus prepared may be checked to determine whether dissolution of the mixed aluminum hydroxide is completed.

Dissolving aluminum sulfate (S2)

Thereafter, aluminum sulfate (Al ₂ (SO ₄ ) ₃ ) is further mixed and dissolved in the aluminum hydroxide solution prepared through step S1. Specifically, a small amount of water is added to the prepared aluminum hydroxide solution to adjust the concentration of the mixed solution, and then aluminum sulfate is added to dissolve it.

In this case, the aluminum sulfate (Al ₂ (SO ₄ ) ₃ ) to be mixed contains both alumina (Al ₂ O ₃ ), which is an active ingredient of fastening power, and sulfate ion (SO ₄ ^2- ), which is an active ingredient of high strength. Therefore, aluminum sulfate reacts with tricalcium aluminate (C3A; 3CaO · Al ₂ O ₃ ) of cement to generate large amounts of ethringite (3CaO · Al ₂ O ₃ · CaSO ₄ · 32H ₂ O) at an early stage. Improves setting speed and early strength

On the other hand, in step S2, it is also preferable that mechanical stirring is performed for about 20 minutes or more for uniform mixing and smooth dissolution. In addition, if the reaction temperature of the step (S2) is maintained at a temperature between 65 ° C and 135 ° C or less, the aluminum sulfate is dissolved in the aluminum hydroxide solution to promote the reaction of becoming a mixed solution.

In addition, the final process of step (S2) to check the transparency of the mixed solution prepared in this way it can be confirmed whether the dissolution of aluminum sulfate is completed.

Adjusting the pH and adding a stabilizer (S3)

Finally, the pH of the mixed solution prepared through step (S2) is adjusted to an appropriate level and a stabilizer is added to prepare the concrete fastener of the present invention.

Specifically, the pH of the mixed solution is adjusted by first mixing and mixing the prepared pH adjusting agent. At this time, the pH adjusting agent raises the pH of the mixed solution and adjusts it to a value between 2.5 and 3.0, thereby making the mixed solution weakly acidic. And, when adjusting the pH it is good to ensure a reaction time of about 20 minutes or more. On the other hand, such a pH adjusting agent may be used one or a mixture of two or more selected from sodium hydroxide (NaOH), sodium silicate (Na ₂ SiO ₃ ), sodium sulfate (Na ₂ SO ₄ ).

Next, when the pH of the mixed solution is adjusted to a value between 2.5 and 3.0, the reaction stabilizer is added and mixed in order to secure the stability of the concrete fastener to the mixed solution. The reaction stabilizer helps to control the pH and ensures the stability of the coagulation reaction. When the reaction stabilizer is mixed, it is preferable to secure a reaction time of about 30 minutes or more.

On the other hand, such a reaction stabilizer may be used amines. This is because amines are characterized by accelerating the hydration reaction of tricalcium silicate (C3S) and disilicate silicate (C2S) of cement to increase the setting speed and shorten the solidification time, thereby securing the stability of the concrete fastener. . In particular, such amines are characterized by increasing the quenching effect of the initial concrete. Meanwhile, as the amines, one or a mixture of two or more selected from diethanolamine, triethanolamine, methylethanolamine, ethylethanolamine, and monoethanolamine may be used.

Finally, the supersaturated liquid stabilizer is added and mixed to the mixed solution. The supersaturated liquid stabilizer is added to ensure the stability of the liquid mixed solution in which aluminum hydroxide and aluminum sulfate are dissolved in a supersaturated state through the above-described steps (S1) and (S2).

On the other hand, such a supersaturated liquid stabilizer may be used magnesium. Magnesium contributes to raising the pH of the mixed solution, and stabilizes the mixed solution to prevent layer separation or gelation and to enable long-term storage. On the other hand, as the magnesium, one or a mixture of two or more selected from magnesium oxide, magnesium carbonate, magnesium sulfate, magnesium hydroxide, and magnesium peroxide may be used.

Concrete fastener of the present invention prepared by such a method, 8 to 15 wt% aluminum hydroxide (Al (OH) ₃ ), 0.1 to 0.5 wt% phosphoric acid, 16 to 18 wt% hydrofluoric acid (HF), 1.5 to 2.5 wt% sulfuric acid (H ₂ SO ₄ ), 30 to 45 wt% aluminum sulfate (Al ₂ (SO ₄ ) ₃ ), 1.5 to 3.5 wt% sodium, 0.3 to 1.5 wt% amines, 3 to 5 wt% magnesium And 20-30 wt% water.

Specifically, the concrete fastener of the present invention includes 8 to 15wt% aluminum hydroxide. In this case, when aluminum hydroxide is added less than 8wt%, the securing of fastening force may be insignificant, and when aluminum hydroxide is added more than 15wt%, physical properties as a fastening agent such as condensation rate and strength may be lowered and may be unstable to form a precipitate. .

In addition, the concrete fastener of the present invention contains 0.1 to 0.5wt% phosphoric acid. At this time, the phosphoric acid can be seen a great effect even if a small amount of input, but if the addition of less than 0.1wt% is small enough to ensure stability, if the phosphoric acid is added more than 0.5wt% can be gelled (gelation) have.

And the concrete fastener of this invention contains 16-18 wt% hydrofluoric acid. The concentration of hydrofluoric acid included herein is usually 50 to 60wt%, the concentration of hydrofluoric acid is preferably 55wt% for the smooth implementation of the present invention. At this time, if hydrofluoric acid is added less than 16wt%, a small amount of hydrofluoric acid does not react with aluminum hydroxide, so that dissolution does not occur. If hydrofluoric acid is added more than 18wt%, hydrofluoric acid, which is a strong acid, may cause an overreaction, resulting in an explosion risk. Low pH of the prepared concrete fasteners will cause problems such as equipment corrosion.

In addition, 1.5 to 2.5 wt% sulfuric acid is included in the concrete fastener of the present invention. Sulfuric acid plays a role of dissolving aluminum hydroxide with hydrofluoric acid, but if it is added more than 2.5wt%, it becomes a strong acid material, which corrodes the manufacturing equipment or causes disadvantages for the manufacturer, so it should be adjusted to the appropriate amount.

In addition, the concrete fastener of the present invention contains 30 to 45wt% aluminum sulfate. Aluminum sulfate contains both alumina (Al ₂ O ₃ ), an active ingredient of fastening power, and sulfate ion (SO ₄ ^2- ), an active ingredient of high strength. Therefore, when aluminum sulfate is included in less than 30wt%, fastening power and high strength cannot be expected, and when aluminum sulfate is included in excess of 45wt%, the excessive amount of sulfate ion (SO ₄ ^2- ) which causes high strength by reducing the long-term strength decrease rate is rather high. The initial coagulation force may be lowered depending on the degree of inclusion.

In addition, the concrete fastener of the present invention includes 1.5 to 3.5wt% sodium. Sodium (Sodium) is input to adjust the pH, Sodium composition (Sodium) composition range in the present invention represents a preferred range, when the excess (5wt% or more) induces the concrete alkali aggregate reaction when the problem of durability Will be generated.

In addition, the concrete fastener of the present invention contains 0.3 to 1.5 wt% amines. The amines are added to accelerate the hydration reaction to impart quenching power of the initial concrete and to ensure stability, the amine composition range in the present invention is a preferred range.

The concrete fastener of the present invention contains 3 to 5 wt% magnesium. Magnesium is added to stabilize the supersaturated liquid mixed solution. When it is added in an amount less than or above the standard range, magnesium does not have a stabilizer effect and the mixed solution is separated into layers or gelation of the mixed solution occurs. Can be caused.

Properties of Concrete Fasteners

Thus prepared concrete fastener of the present invention is a cloudy white stabilized liquid state as shown in Table 1. The pH value is a slightly acidic value between 2.8 and 3.0, which is slightly higher than the pH (2.3 to 2.6) of the conventional fastener, and the specific gravity is 1.50, which is slightly higher than the specific gravity (1.386 to 1.424) of the conventional fastener. In particular, the concrete admixture of the present invention, the content of alumina (Al ₂ O ₃₎ of the active ingredient of class gyeolryeok least 14wt%, sulphate ions (SO ₄ ^{2 -)} the amount of the characterized contained more than 20wt% .

Properties value Remarks condition - Pale white / stabilized liquid pH 2.8 to 3.0 Slightly acidic importance 1.50 -

Condensation test of concrete fastener

On the other hand, the resistance value according to the setting time of the concrete fastener of the present invention was measured. Here, the setting time was measured by using the protruder penetration resistor which is generally used in the condensation experiment of concrete fastener, and the resistance value was measured by injecting the protruder penetration into the depth of 25mm for 10 seconds in the mortar to which the concrete fastener was added. Was measured. Specific test conditions are shown in <Table 2>.

S / C W / C A quick payment
usage laboratory
Temperature laboratory
Humidity Mixed water
Temperature cement
Temperature A quick payment
Temperature 3 50 wt% C * 7wt% 23 ℃ ± 1 78wt% 23 ℃ ± 1 23 ℃ ± 1 23 ℃ ± 1 * Test Spec: Quickcrete for shotcrete (KS F 2782, KCI-SC102)
* Mixing Method: KS L 5109 (Mechanical Mixing Method of Hydraulic Cement Paste and Mortar)
* Compaction method: Compaction time after vibration compaction-mold molding: 10 ~ 15 seconds

In addition, the content of each fastener used in the penetration resistance test is shown in Table 3. Each element content was measured by ICP analysis using an inductively coupled plasma spectrophotometer. Through this, it can be confirmed that the content of alumina (Al ₂ O ₃ ) and sulfate ions (SO ₄ ^2- ) of the concrete fastener of the present invention is increased than the conventional fastener.

division Al S Na Al ₂ O ₃ SO ₄ Na ₂ O Comparative Example 1 58951 54038 7362 11.135 16.211 1,000 Comparative Example 2 58869 57149 7357 11.120 17.145 1,000 Comparative Example 3 60996 60357 7348 11.521 17.507 1,000 Example 1 76793 69853 2983 14.505 20.956 0.50

Thus, the condensation test results of the concrete fastener having the composition of <Table 3> as the test conditions of <Table 2> are as shown in <Table 4>, and are shown in the graph of FIG. Referring to <Table 4> and Figure 2, the penetration resistance value of the concrete fastener (Al ₂ O ₃ content: 14wt% or more) of the present invention containing the most Al ₂ O ₃ is measured the highest alkali conventional It can be seen that it shows superior fastening power compared to Alkari-free fasteners. Further, the sulfate ion (SO ₄ ^2-) concrete admixture of the present invention is the most content (sulfuric acid ion (SO ₄ ^2-) content: more than 20wt%) was confirmed to have no long-term strength of the rate of decrease.

division 1 minute
(MPa) 2 minutes
(MPa) 3 minutes
(MPa) 4 minutes
(MPa) 5 minutes
(MPa) Comparative Example 1 0.18 3.23 7.19 23.31 25.26 Comparative Example 2 0.20 4.57 11.27 25.26 28.61 Comparative Example 3 0.31 5.65 13.93 28.47 30.84 Example 1 1.71 8.59 20.64 40.92 45.38

As described above, the concrete fastener of the present invention has a large amount of rebound due to a decrease in the fastening force, and thus the rebound amount is 20 to 20 due to the fastening force superior to the conventional fastener which caused economic losses such as air delay and waste concrete. Can be reduced to less than 10%, reducing the amount of waste concrete generated more than 50% has an economic and environmentally friendly effect.

In addition, conventional fasteners generally lower the strength of concrete instead of imparting fastness to increase initial adhesion, and are very sensitive to construction conditions, requiring careful management, and using a small amount of conventional fasteners. When the adhesion is weak, a large amount of side effects are generated. However, the fastener of the present invention increases the content of Al ₂ O ₃ and sulfate ions (SO ₄ ^2- ) to improve the fasting power by more than two times compared to the conventional fastener may have the effect of having excellent fastening power even in small amounts of use. In addition, there is an effect that long-term strength does not decrease.

In addition, the conventional fastener is strongly alkaline, causing worker accidents, environmental pollution, etc. during construction, and adversely affects spillage into leachate after work. However, the fastener of the present invention is produced with a weak acidity has the effect of preventing the risk of burns, environmental pollution, leakage of leachate.

In addition, the conventional fastener is excessively included in the alkali metal ions causing an alkali aggregate reaction, resulting in a decrease in durability. However, the fastener of the present invention reduces the content of Na ⁺ alkali metal ions causing an alkali aggregate reaction by more than half of the Na ₂ O content to 0.5 wt%, thereby inhibiting the long-term strength decrease and long-term durability decrease caused by the alkali aggregate reaction. It works.

In addition, the conventional fastener has a problem that it is difficult to secure the visibility as well as the human hazard due to the low storage capacity and the excessive dust generation during the work, while the initial fastening force has a good initial workability and excellent workability. However, the fastener of the present invention is manufactured in a liquid form, it is easy to store and transport, and has an effect of reducing the harmfulness of the human body while increasing the workability by reducing the amount of dust generated.

Therefore, when the concrete fastener of the present invention is applied to a civil engineering / construction industry that requires quick installation in tunnels, dams, and undersea works, it minimizes the fallout rate of construction materials and shortens the process, thereby suppressing waste generation and making economical construction possible. In addition, it can be applied to various technical fields as well as crack repair work such as tunnels or dams.

Such a concrete fastener and its manufacturing method is not limited to the configuration and operation of the embodiments described above. The embodiments may be configured so that all or some of the embodiments may be selectively combined so that various modifications may be made.

Claims (16)

delete delete delete In the manufacture of alkali-free mineral liquid concrete fastener,
Dissolving the mixture containing aluminum hydroxide in hydrofluoric acid to prepare an aluminum hydroxide solution (S1);
Dissolving aluminum sulfate in the aluminum hydroxide solution to prepare a mixed solution of aluminum hydroxide and aluminum sulfate (S2); And
Adjusting the pH of the mixed solution and adding a stabilizer (S3) concrete fastener manufacturing method comprising a.
The method of claim 4,
The mixture is a method of producing a concrete fastener is made by mixing the aluminum hydroxide, phosphates, sodium (sodium) and water.
The method according to claim 5,
The phosphoric acid is a method of producing a concrete fastener comprising one or two or more selected from phosphorous acid (phosphorous acid), metaphosphoric acid (metaphosphoric acid), pyrophosphoric acid, tetra-phosphate (tetra-phosphate).
The method according to claim 5,
The sodium (Sodium) is a method of producing a concrete fastener consisting of one or more selected from sodium hydroxide (NaOH), sodium silicate (Na ₂ SiO ₃ ), sodium sulfate (Na ₂ SO ₄ ).
The method of claim 4,
In the step (S1), when the hydrofluoric acid is added, sulfuric acid is further added to increase the dissolution of the aluminum hydroxide.
The method of claim 4,
The step (S1) is a method for producing a concrete fastener is carried out at least one hour or more stirring at a temperature of 100 ℃ or more.
The method of claim 4,
The step (S2) is a method for producing a concrete fastener, which is carried out by stirring at least 20 minutes at a temperature of 65 ℃ ~ 135 ℃.
The method of claim 4,
The pH control of the mixed solution is prepared by adding one or two or more mixtures selected from caustic soda (NaOH), sodium silicate (Na ₂ SiO ₃ ), sodium sulfate (Na ₂ SO ₄ ).
The method of claim 4,
PH of the mixed solution is adjusted to a value between 2.5 to 3.0 concrete fastener manufacturing method.
The method of claim 4,
The stabilizer is a method for producing a concrete fastener consisting of amines as a reaction stabilizer added to increase the stability of the solidification reaction.
The method according to claim 13,
The amines are a method for producing a concrete fastener comprising one or a mixture of two or more selected from diethanolamine, triethanolamine, methylethanolamine, ethylethanolamine, monoethanolamine.
The method of claim 4,
The stabilizer is a super-saturated liquid stabilizer is added to ensure the stability of the mixed solution as a concrete fastener manufacturing method consisting of magnesium.
16. The method of claim 15,
The magnesium is a method for producing a concrete fastener comprising one or a mixture of two or more selected from magnesium oxide, magnesium carbonate, magnesium sulfate, magnesium hydroxide, magnesium peroxide.

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