KR102257708B1 - Concrete bleeding reducing agent and admixture composition for concrete containing the same - Google Patents

Abstract

The present invention relates to a concrete bleeding reducing agent and an admixture composition for concrete containing the same and, more specifically, to a concrete bleeding reducing agent that contains a starch monomer to suppress bleeding (surplus water) generated in concrete by the gelatinization action of the starch monomer, thereby reducing the occurrence of defects in concrete construction, extending the life of the construction and suppressing the occurrence of construction costs such as defect repair costs, and contains sugar to allow the reaction product generated by the selective reaction of Ca and Al components of cement during the reaction of water and cement to form a vitrification film, thereby delaying the reactivity and improving the initial fluidity and workability of concrete before hardening, and an admixture composition for concrete containing the same. The concrete bleeding reducing agent includes 20 to 35 parts by weight of a corn immersion solution; 15.5 to 55 parts by weight of sugar; 5 to 15 parts by weight of a hydration reaction regulator; and 0.5 to 3 parts by weight of an antifoaming agent.

Description

Concrete bleeding reducing agent and admixture composition for concrete containing the same}

The present invention relates to a concrete bleeding reducing agent and an admixture composition for concrete containing the same, and more specifically, by containing a starch monomer, the bleeding (excess water) generated in the concrete is suppressed by the gelatinization of the starch monomer. By reducing the occurrence of defects in construction, it is possible to extend the life of the building and suppress the occurrence of construction costs such as defect repair costs, and by containing sugars, the reaction product generated by the selective reaction between the Ca and Al components of the cement is vitrified when water and cement react. It relates to a concrete bleeding reducing agent capable of improving the initial fluidity and workability of concrete before curing by delaying reactivity by forming a film, and an admixture composition for concrete comprising the same.

In general, concrete is composed of cement, sand, gravel, admixtures, and water.

However, the use of recycled aggregates and crushed sand is increasing in a situation where the supply of high-quality natural aggregates becomes difficult.

In addition, the use of cement substitutes such as slag powder and fly ash, which have poor reactivity with water, is increasing.

For example, in Korean Patent Registration No. 10-1773597, 20 to 40 parts by weight of a polycarboxylic acid-based fluidizing agent composed of a first polycarboxylate ether, a second polycarboxylate ether, and a third polycarboxylate ether, and 50 to 70 parts by weight of water. Includes parts by weight, wherein the first polycarboxylate ether is prepared by polymerizing dipropylene glycol diacrylate and polydimethylsiloxane, and the second polycarboxylate ether is an ethyl acrylate monomer, tetraethoxysilane, and acrylic acid. And the third polycarboxylate ether is prepared by polymerizing unsaturated polyalkylene glycol ether, maleic acid, and 3,6,9-trioxadecanoic acid. The composition is disclosed.

As the use of cement substitutes such as slag powder increases, the amount of concrete bleeding, which is one of the main causes of construction defects, is gradually increasing and is a social problem.

Korean Patent Registration No. 10-1773597 Korean Patent Registration No. 10-1292175 Korean Patent Registration No. 10-0581148 Korean Patent Registration No. 10-1470511

The present invention was conceived to solve the above-described problem, and the object of the present invention is to suppress bleeding (excess water) generated in concrete by containing starch monomer, resulting in concrete construction. By reducing the reduction, it is possible to suppress the occurrence of construction costs such as extending the life of the building and repairing defects.By containing sugar, the reaction product generated by the selective reaction between the Ca and Al components of the cement when reacting with water and cement forms a vitrified film and is reactive. It is to provide a saccharide concrete bleeding reducing agent that can improve the initial fluidity and workability of concrete before curing by delaying the curing and an admixture composition for concrete containing the same.

The problem to be solved of the present invention is not limited to those mentioned above, and other problems that are not mentioned will be clearly understood by those skilled in the art from the following description.

Concrete bleeding reducing agent according to the present invention and corn immersion liquid containing starch monomer; Saccharides; A hydration reaction regulator; It characterized in that it contains; antifoaming agent.

In addition, in the concrete bleeding reducing agent according to the present invention, 20 to 30 parts by weight of corn immersion liquid, 15.5 to 55 parts by weight of the sugar, 5 to 15 parts by weight of the hydration control agent, and 0.5 to 3 parts by weight of the antifoaming agent It characterized in that it includes.

In addition, in the concrete bleeding reducing agent according to the present invention, the saccharide is selected from at least one of carboxymethyl glucose, methoxy galactose, and trisaccharide, the hydration control agent is potassium hydroxide, and the antifoaming agent is tributyl phosphate. Characterized by that.

In addition, in the concrete bleeding reducing agent according to the present invention, the saccharide is characterized in that consisting of 5 to 20 parts by weight of the carboxymethyl glucose, 10 to 30 parts by weight of the methoxy galactose, and 0.5 to 5 parts by weight of the trisaccharide do.

In addition, the admixture composition for concrete according to the present invention comprises 10 to 30 parts by weight of a concrete bleeding reducing agent composition; 30 to 50 parts by weight of a polycarboxylic acid water reducing agent; 10 to 25 parts by weight of a polycarboxylic acid-based retention agent; It characterized in that it contains; 10 to 20 parts by weight of the resin-based air entraining agent.

In addition, the present invention is characterized in that the concrete composition in which the occurrence of bleeding is reduced comprises an admixture composition for concrete.

The concrete bleeding reducing agent proposed in the present invention and the admixture composition for concrete containing the same contain starch monomer to suppress the bleeding (excess water) generated in concrete by the gelatinization of the starch monomer, thereby preventing the occurrence of concrete construction defects. By reducing the construction life, it is possible to suppress the occurrence of construction costs such as prolonging the life of the building and repairing defects. By containing saccharides, the reaction product generated by the selective reaction between the Ca and Al components of the cement during the reaction of water and cement forms a vitrified film to increase reactivity It has the effect of delaying and improving the initial fluidity and workability of concrete before hardening.

The effects of the present invention are not limited to those mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the following description.

1 is a view showing each step of the gelatinization action of the starch monomer.
FIG. 2 is a diagram showing conditions for generating gelatinization of starch monomers and an environment for a hydration reaction of concrete.

Hereinafter, preferred embodiments of the present invention will be described in detail.

In describing the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, a detailed description thereof will be omitted. In addition, terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to the intentions or precedents of users or operators. Therefore, the definition should be made based on the contents throughout the present specification.

The concrete bleeding reducing agent composition according to the present invention is a food processing by-product and can significantly reduce the occurrence of bleeding of concrete through a reaction due to the gelatinization action with excess water generated by bleeding using corn immersion liquid containing starch monomer and sugars. It is characterized by being able to.

More specifically, the concrete bleeding reducing agent composition according to the present invention comprises 20 to 35 parts by weight of corn immersion liquid, 15.5 to 55 parts by weight of the saccharide, 5 to 15 parts by weight of the hydration control agent, and 0.5 to 3 parts by weight of an antifoaming agent. It can be illustrated to include.

The corn immersion liquid is a liquid by-product generated during the immersion process during the production of corn starch, contains starch monomer, and has a pH of 3.5 to 4.7. In the present invention, the concentration was used so that the active ingredient content of the solid content is 70 to 80% by weight.

If the corn immersion liquid is used in less than 20 parts by weight, it is difficult to sufficiently expect the bleeding reduction effect due to the gelatinization action of the starch monomer contained in the corn immersion liquid, and if it exceeds 35 parts by weight, physical properties such as strength are rather reduced. It is desirable to limit it to a range.

The starch monomer contained in the corn immersion liquid reacts with water under several conditions as shown in FIGS. 1 and 2 to change the reactant in a gell form, and the hydration environment of concrete is a very favorable environment for the gelatinization to occur. Provides.

Therefore, the occurrence of gelatinization of starch monomer will be promoted in the hydration reaction environment of concrete, and by increasing the reaction level of gelatinization with additional additives, the bleeding (excess water) generated in the concrete is suppressed by the gelatinization of the starch monomer. .

Starch monomers have a higher specific gravity than water and, unlike other carbohydrates, exist in the form of separated granules and can maintain their shape as particles, because of hydrogen bonding. In addition, starch monomers are composed of linear amylose and branched amylopectin, which have different characteristics in physical form and character. When these starch monomers are heated with water, the starch suspension forms a transparent or semi-solid colloidal solution with a high viscosity as the temperature rises. When the concentration is high or cooled, a semi-solid gel is formed. The phenomenon of changing physical properties is called gelatinization. Due to this characteristic, starch monomer reacts with cement due to the high concentration of alkalization that occurs when cement and water meet, and the heat of hydration that occurs when it is used as an additive for concrete. It can significantly reduce the occurrence of concrete bleeding due to the reaction due to the gelatinization action.

The saccharide acts as a starch-based thickener and acts as an additive to promote gelatinization.

In addition, when the saccharide reacts with water, which is the main reactant of concrete, the reaction product generated by the selective reaction between the Ca and Al components of the cement forms a vitrification film, delaying the reactivity to maintain the initial fluidity and workability of the concrete before curing. By providing an excellent effect on the part, it plays a role in improving the initial flowability and maintenance performance of concrete, and includes CarboxyMethyl Glucose (C ₈ H ₁₄ O ₈ ), Methoxy Galactose (C ₇ H _14). O ₇ ) It can be illustrated that at least one of the trisaccharide (Trisaccharide) is selected. The trisaccharide may be mentioned, such as three glucose molecules are α nige lot Rios connected by glycosidic bonds _{(Nigerotriose, C 18 H 32 O} 16), maltotriose _{(Maltotriose, C 18 H 32 O} 16).

For example, it may be exemplified that the carboxymethyl glucose is 5 to 20 parts by weight, the methoxy galactose is 10 to 30 parts by weight, and the trisaccharide 0.5 to 5 parts by weight.

The hydration control agent may be potassium hydroxide.

The antifoaming agent is for controlling the amount of entrained air that is increased by gelatinization, and may be an organic antifoaming agent, Tributyl phosphate.

On the other hand, the admixture composition for concrete according to the present invention includes 10 to 30 parts by weight of the above-described concrete bleeding reducing agent composition, 30 to 50 parts by weight of a polycarboxylic acid-based water reducing agent, 10 to 25 parts by weight of a polycarboxylic acid-based retaining agent, and resin-based It may be exemplified that it includes 10 to 20 parts by weight of an air entraining agent and 5 to 8 parts by weight of an antifoaming agent.

Hereinafter, the present invention will be described in more detail through preferred embodiments of the concrete bleeding reducing agent composition and the admixture composition for concrete according to the present invention.

Preparation of concrete bleeding reducing agent composition

Corn soaking liquid 30 parts by weight, carboxymethyl glucose (CarboxyMethyl Glucose, C ₈ H ₁₄ O ₈ ) 10 parts by weight, methoxy galactose (Methoxy Galactose, C ₇ H ₁₄ O ₇ ) 20 parts by weight, maltotriose (Maltotriose, C ₁₈ H ₃₂ O ₁₆ ) 1 part by weight, 10 parts by weight of potassium hydroxide, and 1 part by weight of tributyl phosphate were mixed to prepare a concrete bleeding reducing agent composition.

Preparation of admixture composition for concrete

20 parts by weight of the concrete bleeding reducing agent composition prepared in Example 1, 30 to 50 parts by weight of a polycarboxylic acid-based water reducing agent (BNB Co., Ltd., BFT-500SM product), and a polycarboxylic acid-based retaining agent (Qingdao Fine Chemical, FW-40 product) ) 10 to 25 parts by weight, 10 parts by weight of a resin-based air entraining agent (GAT, HS-AE 151 product), and 6 parts by weight of tributyl phosphate were mixed to prepare an admixture composition for concrete.

[Comparative Example 1]

Comparative Example 1 used the domestic H company's CONPLAST PA600P product.

[Comparative Example 2]

In Example 1, without using the corn immersion liquid, carboxymethyl glucose (CarboxyMethyl Glucose, C ₈ H ₁₄ O ₈ ) 25 parts by weight, methoxy galactose (Methoxy Galactose, C ₇ H ₁₄ O ₇ ) 30 parts by weight, maltot The composition was prepared in the same manner except for mixing 6 parts by weight of rios (Maltotriose, C ₁₈ H ₃₂ O ₁₆ ), 10 parts by weight of potassium hydroxide, and 6 parts by weight of tributyl phosphate, and the table below A concrete composition of the same formulation as in 3 was prepared.

[Comparative Example 3]

In Example 1, without using carboxymethyl glucose, methoxy galactose, maltotriose, 61 parts by weight of corn immersion liquid, 10 parts by weight of potassium hydroxide, and 1 part by weight of tributyl phosphate are mixed A concrete bleeding reducing agent composition was prepared, and a concrete composition of the mixture as shown in Table 3 was prepared.

Hereinafter, in order to test the performance of the concrete bleeding reducing agent composition or the admixture composition for concrete according to the present invention, a concrete composition having the mixing ratio of Table 1 was prepared.

In Table 1 below, Manufacturing Examples 1 to 5 use slag cement and fly ash, which are the main causes of bleeding, as a binder to maximize the occurrence of concrete bleeding based on the standard concrete mix 25-21-150 commonly used in the field. Natural sand (S1) and crushed sand (S2) were used as the used sand.

And Manufacturing Example 1 used the domestic H company's CONPLAST PA600P product as an additive (AD), Manufacturing Example 2 was using the concrete bleeding reducing agent composition of Example 1 as an additive (AD), Preparation Example 3 was an additive (AD) As an admixture for concrete of Example 2 was used, and Preparation Examples 4 and 5 used the admixtures for concrete of Comparative Examples 2 and 3 as additives (AD).

W/C S/A Unit weight of material(kg/m3) W OPC S/C F/A S1 S2 G AD(%) Manufacturing Example 1 55.6 42.9 173 62 218 31 658 282 877 0.7 (Comparative Example 1) Manufacturing Example 2 55.6 42.9 173 62 218 31 658 282 877 0.7 (Example 1) Manufacturing Example 3 55.6 42.9 173 62 218 31 658 282 877 0.7 (Example 2) Manufacturing Example 4 55.6 42.9 173 62 218 31 658 282 877 0.7 (Comparative Example 2) Manufacturing Example 5 55.6 42.9 173 62 218 31 658 282 877 0.7 (Comparative Example 3)

[Test Example 1] Slump, Air content and Bleeding measurement test

After mixing the prepared concrete composition using a forced mixer, the ratio of the slump, the amount of air, and the amount of bleeding was measured by the experimental method based on KS F 2560:2019, and the results are shown in Table 2 below.

Slump(mm) Air content(%) Bleeding(%) Manufacturing Example 1 180 4.8 65 Manufacturing Example 2 155 5.2 36 Manufacturing Example 3 180 4.6 42 Manufacturing Example 4 175 4.9 59 Manufacturing Example 5 177 4.8 53

Looking at Table 2 above, it was confirmed that in the slump value, Preparation Example 2 using the concrete bleeding reducing agent composition of Example 1 was the smallest, and in the case of the bleeding amount, Preparation Example 2 and Preparation Example 3 were significantly reduced compared to Preparation Example 1. Could.

And, as in Comparative Examples 2 and 3, when no corn immersion liquid or sugar was added, it was confirmed that the amount of bleeding rapidly increased as compared to Example 1.

The present invention described above is merely exemplary, and those of ordinary skill in the art will appreciate that various modifications and other equivalent embodiments are possible therefrom. Therefore, it will be appreciated that the present invention is not limited to the form mentioned in the detailed description above. Therefore, the true technical protection scope of the present invention should be determined by the technical spirit of the appended claims. In addition, the present invention is to be understood as including the spirit of the present invention as defined by the appended claims and all modifications, equivalents and substitutes within the scope thereof.

Claims (5)

In the concrete bleeding reducing agent composition comprising a corn immersion liquid containing starch monomer, sugars, hydration reaction regulator, and antifoaming agent,
20 to 35 parts by weight of the corn immersion liquid;
15.5 to 55 parts by weight of the saccharide;
5 to 15 parts by weight of the hydration control agent;
Including 0.5 to 3 parts by weight of the antifoaming agent,
The saccharide is selected from at least one of carboxymethyl glucose, methoxy galactose, and trisaccharide,
The hydration control agent is potassium hydroxide,
The antifoaming agent is tributyl phosphate,
The saccharide is a concrete bleeding reducing agent composition, characterized in that consisting of 5 to 20 parts by weight of the carboxymethyl glucose, 10 to 30 parts by weight of the methoxy galactose, and 0.5 to 5 parts by weight of the trisaccharide.
delete delete delete 10 to 30 parts by weight of the concrete bleeding reducing agent composition of claim 1;
30 to 50 parts by weight of a polycarboxylic acid water reducing agent;
10 to 25 parts by weight of a polycarboxylic acid-based retention agent;
10 to 20 parts by weight of a resin-based air entraining agent;
Concrete admixture composition comprising a.

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