KR102016991B1 - Concrete composition - Google Patents

Abstract

[화학식 2]

The present invention is a cement binder 10-25% by weight, acrylic resin 1-5% by weight, siloxane resin 1-5% by weight, fine aggregate 25-45% by weight, coarse aggregate 20-35% by weight, latex 1-10% by weight, blast furnace It provides a concrete composition comprising 1 to 5% by weight of slag, 1 to 5% by weight anhydrous gypsum, and 1-3% by weight of the compound represented by the following formula (1) or (2):
[ Formula 1 ]

[Formula 2]

Description

Concrete composition {CONCRETE COMPOSITION}

The present invention relates to a concrete composition.

The roads are divided into sidewalks and driveways for the safe passage of vehicles and pedestrians, and the sidewalk road boundary seats are installed on the boundary line to separate them.

In general, the boundary stone is composed of a hexahedron having a rectangular cross-sectional structure, depending on the processing method, natural granite boundary stone, general concrete boundary stone, artificial granite boundary stone and the like are used.

Among them, natural granite boundary stone has a beautiful aesthetic advantage, while the price is expensive and most of them have to rely on imports.

General concrete boundary stone is inexpensive because it can be mass-produced, but has a disadvantage in terms of aesthetics and quality such as color and texture.

In the case of artificial granite boundary stone, it is a method of manufacturing a boundary stone by mixing marble pieces and concrete, and grinding the surface by using water and a grinding machine, and having better appearance quality than the conventional concrete boundary stone, There are some disadvantages.

In addition, in case of general concrete boundary stone and artificial granite boundary stone, water and salt penetrate, freezing and thawing are repeated, and expansion and contraction are repeated, so that cracking occurs easily, and salts, especially by neutralization by salts of Cl ^- ions, are generated. Has the disadvantage.

Therefore, there is a demand for development of a boundary stone having a good manufacturing cost and excellent appearance and excellent quality such as durability by preventing cracks and salts.

Republic of Korea Patent Publication No. 10-2001-0073490

The present invention has been made to solve the above problems of the prior art,

An object of the present invention is to provide a latex modified concrete composition for boundary stones having a beautiful appearance similar to that of natural granite boundary stones, having excellent durability due to minimizing cracks and salts.

The present invention, in order to achieve the above object,

10-25% by weight of cement binder, 1-5% by weight of acrylic resin, 1-5% by weight of siloxane resin, 25-45% by weight of fine aggregate, 20-35% by weight of coarse aggregate, 1-10% by weight of latex, blast furnace slag 1 to It provides a concrete composition comprising 5% by weight, 1 to 5% by weight anhydrous gypsum, and 1-3% by weight of the compound represented by the following formula (1) or (2):

[ Formula 1 ]

[Formula 2]

In addition, the concrete composition of the present invention may further comprise 3 to 5% by weight of the compound represented by the formula (3) relative to the total weight of the composition:

[Formula 3]

N is a natural number of 1-10.

The latex may be a liquid latex in which a styrene-butadiene copolymer and water are mixed in a weight ratio of 1: 2 to 2: 1.

The concrete composition of the present invention includes a latex, and by including a salt prevention component, has a beautiful appearance similar to natural granite boundary stone, it is possible to provide a boundary stone with excellent durability and low manufacturing cost by minimizing cracks and salts. .

Hereinafter, the present invention will be described in detail.

The present invention is a cement binder 10-25% by weight, acrylic resin 1-5% by weight, siloxane resin 1-5% by weight, fine aggregate 25-45% by weight, coarse aggregate 20-35% by weight, latex 1-10% by weight, blast furnace It relates to a concrete composition comprising 1 to 5% by weight of slag, 1 to 5% by weight anhydrous gypsum, and 1-3% by weight of the compound represented by the following formula (1) or (2):

[ Formula 1 ]

[Formula 2]

In addition, the concrete composition of the present invention may further include 3 to 5% by weight of the compound represented by the formula (3) based on the total weight of the composition.

[Formula 3]

N is a natural number of 1-10.

As the cement-based binder, those known in the art such as general portland cement and fast cement may be used.

The acrylic resin is excellent in weather resistance to prevent deterioration of durability, such as cracks due to external environmental changes, and to improve the adhesion strength and toughness of the composition. As the acrylic resin, a resin known in the art may be used. For example, monofunctional (meth) acrylate resin which has alkyl (meth) acrylates, hydroxyalkyl (meth) acrylates, alicyclic monofunctional (meth) acrylates, and an aromatic ring is mentioned. In the above, the alkyl group means a straight or branched chain having 1 to 12 carbon atoms.

The siloxane resin is used to maintain the workability by lowering the viscosity of the latex modified concrete composition for boundary stones, and to improve the ductility properties. In addition, it is used to improve the strength of the boundary stone because it is excellent in acid and alkali resistance. As the siloxane resin, a resin known in the art may be used. For example, polyorganosiloxane may specifically include polydialkylsiloxane, and (meth) acrylate-polysiloxane, vinyl polysiloxane, and the like may be used.

In the polydialkylsiloxane, an alkyl group means a straight or branched chain having 1 to 12 carbon atoms.

The fine aggregate means an aggregate having a particle diameter of 5 mm or less, and the coarse aggregate means an aggregate having a particle diameter of more than 5 mm.

The latex is used to make the appearance of the boundary stone similar to the natural granite boundary stone, and also serves to prevent the penetration of moisture and salt.

As the latex, those used in the art may be used without limitation. For example, a liquid latex obtained by mixing styrene-butadiene copolymer and water in a weight ratio of 1: 2 to 2: 1 may be preferably used.

The blast furnace slag is used to improve latent hydraulic properties, long-term strength development and durability. Increasing the weight ratio of blast furnace slag lowers the initial strength, but increases the long-term strength development and durability. Instead of blast furnace slag, fly ash, silica powder and silica fume may be used.

The blast furnace slag is included 1 to 5% by weight. If the content of blast furnace slag is less than 1% by weight, the initial strength of the composition is expressed, but the long-term strength and durability may be reduced.When the content of the blast furnace slag exceeds 5% by weight, the workability and long-term strength of the composition are improved. However, it may delay the development of initial intensity.

There is to generate the anhydrous gypsum (CaSO4) is eth- Lin ZUID (AFt _{phase, C 3 A · 3CaSO 4 ·} 32H 2 O) initially with particular reaction and _{C3A (3CaO · Al 2 O 3} ) of micro-cement component, The resulting ethrinzite is reduced in amount as the hydration proceeds, or a part thereof is transferred to monosulfate (on AFm, C3A.CaSO ₄ .12H ₂ O). When anhydrous gypsum is added, ethrinzite is produced from the beginning, densifying the structure of the cement, thereby increasing the penetration resistance to chloride ions at an early age.

When the content of the anhydrous gypsum exceeds 5% by weight, the initial strength expression effect is excellent, but durability may be reduced, and when the content of the anhydrous gypsum is less than 1% by weight, initial strength may be delayed.

The compound represented by Formula 1 or Formula 2 is used to prevent salt damage of the concrete composition.

[ Formula 1 ]

[Formula 2]

The degradation of concrete by chlorides causes the chlorides to react with Ca (OH) ₂ , a cement hydration product, to form crystals such as CaO · CaCl ₂ · 2H ₂ O and Mg ₂ (OH) ₃ Cl · 4H ₂ O. Swelling, partly due to increased voids as it elutes outside. However, the degradation caused by the penetration of chloride ions (Cl ⁻ ) into the concrete is greater than the degradation of the concrete itself by such chemical action.

The compound of Formula 1 or Formula 2 are Cl ^- and prevents the ions from entering the boundary stone structure ^- Cl by fixing the ^ion-ion reaction by Cl.

In particular, the compound of Formula 1 or Formula 2 includes both organic components and inorganic components (Si, etc.), so that the compounds can be mixed firmly, stably, and uniformly in the concrete composition.

The compound represented by the following formula (3) included in the concrete composition of the present invention has a structure in which three vinyl groups are introduced into the sock end of the urethane skeleton. Since the compound of Formula 3 is not only organic components such as acrylic resin, siloxane resin, and latex due to the above structural properties, but also strongly bonds with inorganic components such as cement and aggregate to form a three-dimensional network structure, Significantly improve strength and durability.

[Formula 3]

N is a natural number of 1-10.

The concrete composition of the present invention may further contain one or more additives selected from colorants, curing accelerators, antifoams, dispersants, ultraviolet stabilizers, sunscreen agents, inorganic fillers, emulsifiers, surfactants, viscosity modifiers, antioxidants, and the like, as necessary. It is not limited thereto.

The coloring agent may be a sieving pigment, coloring pigments, dyes, etc., sieving pigments calcium carbonate, magnesium carbonate, silica, silica-alumina, glass powder, glass beads, mica, graphite, barium equivalents, aluminum hydroxide, talc, Kaolin, acidic clay, activated clay, bentonite, diatomaceous earth, montmorillonite, dolomite and the like can be selected and used, but not limited thereto. Color pigments include, for example, titanium oxide, zincated, carmine 6B (CI12490), phthalocyanine green (CI 74260), phthalocyanine blue (CI 74160), Mitsubishi carbon black MA100, perylene black (BASF K0084. K0086), cyanine black, Linol Yellow (CI21090), Linol Yellow GRO (CI 21090), Benzidine Yellow 4T-564D, Mitsubishi Carbon Black MA-40, Victoria Pure Blue (CI42595), CI PIGMENT RED97, 122, 149, 168, 177, 180, 192, 215, C.I. PIGMENT GREEN 7, 36, C.I. PIGMENT 15: 1, 15: 4, 15: 6, 22, 60, 64, C.I. PIGMENT 83, 139 C.I. One or more kinds of PIGMENT VIOLET 23 may be selected and used, but the present invention is not limited thereto.

As the curing accelerator, for example, one or more of phenol, nonylphenol, tertiary amine, merethane, dibutyl diacetate, dibutylene dilaurate, monobutylene oxide, monobutylene chloride dihydroxide and the like can be used. It may be selected and used, but is not limited thereto.

As the antifoaming agent, the polymer and polysiloxane solution which breaks bubbles are mainly used by BYK-C501 manufactured by BYK-Chemie. Also, one or more of EFKA's EFKA8203 and Impag's Perenol E8 may be selected and used. It is not limited.

The dispersant may include BYK- # 161, BYK- # 168, 1-methoxy-2propylene acetate, EFKA EFKA4048, manufactured by BYK-Chemie Co., Ltd., the main component of which is a high molecular weight block copolymer having a pigment affinity group. Although one or more types, such as 4060, can be selected and used, it is not limited to this.

The inorganic filler is preferably at least one selected from the group consisting of calcium carbonate, talc, bicarbonate, silica, and dolomite, but is not limited thereto.

The emulsifier is preferably at least one selected from the group consisting of a copolymer of polyoxyethylene and polyoxypropylene, a copolymer of polyoxyethylene and polyoctylphenyl ether, and sodium dodecylbenzene sulfide, but is not limited thereto.

The method for producing the boundary stone using the concrete composition of the present invention can be carried out by conventional methods known in the art.

Hereinafter, the present invention will be described in more detail with reference to Examples. However, the following examples are intended to illustrate the present invention more specifically, but the scope of the present invention is not limited by the following examples. The following examples can be appropriately modified and changed by those skilled in the art within the scope of the present invention.

Preparation Example 1 Preparation of Displayed Compounds of Formula 3

In a three-necked reactor, 112.6 g of Kopex-PEG-400 (concentrated) and 0.1 g of dibutyl tin laurate were added to a heating device connected to a mechanical stirrer, a temperature sensor, and a temperature sensor, followed by stirring at room temperature. 64.9 g of hexamethylene diisocyanate (HMDI) was added and reacted. 322.1 g of pentaerythritol triacrylate (manufactured by Sigma-Aldrich, CAS Number 3524-68-3) and 0.2 g of methoxy hydroquinone were added to the reaction solution, and the reaction temperature was maintained at 75 and allowed to react for 3 hours. It was judged that the reaction was completed when 2260 cm-1, the characteristic peak of the isocyanate in the infrared spectrum, disappeared completely. After the reaction was completed, 224 g of 3-trimethoxysilylpropylglycidyl ether was added thereto, followed by stirring for 1 hour, thereby reacting the reaction between the epoxy group of 3-trimethoxysilylpropylglycidyl ether and the amine group included in the urethane structure. It proceeded and the target compound was manufactured.

Example 1 : Preparation of Concrete Composition

18% by weight of Portland cement, 3% by weight of butyl acrylate resin, 3% by weight of polydimethylsiloxane resin, 38% by weight of fine aggregate, 27% by weight of coarse aggregate, styrene-butadiene copolymer and water in a weight ratio of 5: 5 3% by weight of liquid latex, 3% by weight of blast furnace slag, 2% by weight of anhydrous gypsum, and 3% by weight of the compound of Formula 1 were mixed in a mixer to prepare a concrete composition.

[ Formula 1 ]

Example  2: preparation of concrete compositions

18% by weight of Portland cement, 2% by weight of butyl acrylate resin, 2% by weight of polydimethylsiloxane resin, 38% by weight of fine aggregate, 27% by weight of coarse aggregate, styrene-butadiene copolymer and water in a weight ratio of 5: 5 3% by weight of liquid latex, 2% by weight of blast furnace slag, 2% by weight of anhydrous gypsum, 3% by weight of the compound for preventing salt of Formula 2, and 3% by weight of the compound prepared in Preparation Example 1 were mixed in a mixer to prepare a concrete composition. .

[Formula 2]

Test Example 1 : Evaluation of Physical Properties of Preparation of Concrete Composition

Water was mixed with the compositions prepared in Examples 1 and 2, and placed in a formwork to form a boundary stone.

The physical properties of the boundary stone were evaluated by the method described in Table 1 below, and the results are shown in Table 1 below.

Evaluation item result Reference value Test Methods Boundary stone prepared from the composition of Example 1 Tensile 478.2 kg / cm ² 210 kg / cm ² or more KS M 3006: 2003 Flexural strength 575.5 kg / cm ² 320 kg / cm ² or more KS M 3015: 1997 Flexural modulus 29,110 kg / cm ² 17,600 kg / cm ² or more KS M 3015: 1997 Peel strength 5.0 N / mm 178.6 g / mm or more ASTM D903: 1998 Boundary stone prepared from the composition of Example 2 Tensile 482.2 kg / cm ² 210 kg / cm ² or more KS M 3006: 2003 Flexural strength 586.5 kg / cm ² 320 kg / cm ² or more KS M 3015: 1997 Flexural modulus 29,210 kg / cm ² 17,600 kg / cm ² or more KS M 3015: 1997 Peel strength 5.1 N / mm 178.6 g / mm or more ASTM D903: 1998

As confirmed in Table 1, the concrete composition of the present invention showed very excellent physical properties in all aspects of the tested tensile strength, flexural strength, flexural modulus, and peel strength. In particular, the composition of Example 2, which further comprises a compound of Formula 3, showed a better effect.

Test Example 2 : concrete Anti-salting performance of the composition  evaluation

(1) Test 1

In order to test the resistance of chlorine ion penetration, the test piece was cut to 5 cm thickness of the boundary stone prepared in Test Example 1, which is 28 days old, to prepare a test piece.

The amount of pass charge obtained by integrating the current measured every 30 minutes under the condition that the diffusion cell was configured by the test piece and the 60 V DC power was supplied for 6 hours was shown in Table 2 below.

Passage charge (Coulomb) Boundary stone prepared from the composition of Example 1 0 Boundary stone prepared from the composition of Example 2 0

As shown in Table 2, in the test piece made of the concrete composition according to the present invention, the amount of passing charge was not measured, and it was confirmed that the specimen had perfect chlorine ion penetration resistance.

Claims (1)

10-25% by weight cement binder, 1-5% by weight acrylic resin, 1-5% by weight siloxane resin, 25-45% by weight fine aggregate, 20-35% by weight coarse aggregate, 1-10% by weight latex, blast furnace slag 1 to 5 wt%, anhydrous gypsum 1-5 wt%, and 1-3 wt% of a compound represented by the following Formula 1 or Formula 2,
Concrete composition characterized in that it further comprises 3 to 5% by weight relative to the total weight of the compound represented by the formula (3):
[ Formula 1 ]

[Formula 2]

[Formula 3]

N is a natural number of 1-10.