KR20180131327A - Concrete composition - Google Patents

Abstract

The present invention provides a concrete composition comprising: 10-25 wt% of a cement based binding material; 1-5 wt% of acrylic resin; 1-5 wt% of siloxane resin; 25-45 wt% of fine aggregate; 20-35 wt% of coarse aggregate; 1-10 wt% of latex; 1-5 wt% of blast furnace slag; 1-5 wt% of anhydrous gypsum; and 1-3 wt% of a compound represented by chemical formula 1 or chemical formula 2. The concrete composition includes the latex and a salt damage preventing component to have elegant appearance similar to a natural granite boundary stone, and minimizes cracks and salt damage to enhance durability.

Description

[0001] CONCRETE COMPOSITION [0002]

The present invention relates to a concrete composition.

Roads are divided into roads and roads for the safe passage of vehicles and pedestrians.

Generally, boundary stones are composed of hexahedrons having a rectangular cross-sectional structure. Depending on the processing method, natural granite boundaries, ordinary concrete boundary stones, and artificial granite boundaries are used.

Among these, the natural granite boundaries have the advantage of aesthetic beauty, but they are expensive and depend on imports for the most part.

Generally, concrete blocks are inexpensive because they can be mass-produced, but they are inferior in terms of aesthetics and quality such as color and texture.

In the case of artificial granite boundaries, granite is prepared by mixing marble slabs and concrete, and its surface is ground by grinding using water and a grinder. It is superior in appearance quality to the above-mentioned general concrete slabs, There is a disadvantage that it falls somewhat.

In addition, in the case of general concrete boundary and artificial granite boundaries, water and salt penetrate, repeated freezing and thawing repeatedly, expansion and contraction are repeated, cracks easily occur, and salinity is generated by neutralization due to salinity, especially Cl ^- ion .

Therefore, there is a demand for the development of a barrier coating excellent in appearance such as durability and prevention of cracking and salt corrosion while having an appropriate manufacturing cost.

Korean Patent Publication No. 10-2001-0073490

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems of the prior art,

It is an object of the present invention to provide a latex modified concrete composition for a barrier slab having a beautiful appearance similar to a natural granite boundary stone, minimizing cracking and salt damage, and having excellent durability and a low manufacturing cost.

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

10-15% by weight of cementitious 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, 1 to 5% by weight of anhydrous gypsum, and 1 to 3% by weight of a compound represented by the following formula (1) or (2)

[ Formula 1 ]

(2)

Also, the concrete composition of the present invention may further contain 3 to 5% by weight based on the total weight of the composition of a compound represented by the following formula (3)

(3)

In the above formula, n is a natural number of 1 to 10.

The latex may be a liquid latex obtained by mixing a styrene-butadiene copolymer and water in a weight ratio of 1: 2 to 2: 1.

The concrete composition of the present invention includes a latex, and it is possible to provide a barrier stone having a beautiful appearance similar to a natural granite boundary stone, minimizing cracking and salt damage, and having excellent durability and low manufacturing cost, .

Hereinafter, the present invention will be described in detail.

The present invention relates to a cement mortar composition comprising 10-25% by weight of a cementitious binder, 1-5% by weight of an acrylic resin, 1-5% by weight of a siloxane resin, 25-45% by weight of a fine aggregate, 20-35% by weight of a coarse aggregate, 1 to 5% by weight of slag, 1 to 5% by weight of anhydrous gypsum, and 1 to 3% by weight of a compound of the formula 1 or 2:

[ Formula 1 ]

(2)

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

(3)

In the above formula, n is a natural number of 1 to 10.

As the above-mentioned cement based binders, there may be used those generally known in the art such as general Portland cement and quick-setting cement.

The acrylic resin is excellent in weatherability to prevent deterioration of durability such as cracking due to changes in the external environment, and to improve the adhesion strength and toughness of the composition. As the acrylic resin, a resin known in the art can be used. Examples thereof include monofunctional (meth) acrylate resins having alkyl (meth) acrylates, hydroxyalkyl (meth) acrylates, alicyclic terminal functional (meth) acrylates and aromatic rings. In the above, the alkyl group means a straight chain or branched chain having 1 to 12 carbon atoms.

The siloxane resin is used to lower the viscosity of the latex modified concrete composition for barrier seams to maintain workability and to improve ductility. It is also used to improve the strength of the boundary stone because it is excellent in acid resistance and alkali resistance. As the siloxane resin, resins known in this field can be used. For example, polyorganosiloxane, specifically polydialkylsiloxane, and methacrylate-polysiloxane, vinylpolysiloxane, and the like may be used.

The alkyl group in the polydialkylsiloxane means a straight or branched chain having 1 to 12 carbon atoms.

The fine aggregate means an aggregate having a grain size of 5 mm or less, and the coarse aggregate means an aggregate having a grain size exceeding 5 mm.

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

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

The blast furnace slag is used for improving latent hydraulic characteristics, long-term strength development and durability. When the weight ratio of the blast furnace slag is increased, the initial strength is lowered, but the long-term strength development and durability are increased. Fly ash, silica powder and silica fume may be used instead of blast furnace slag.

The blast furnace slag is contained in an amount of 1 to 5% by weight. When the content of the 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 lowered. When the blast furnace slag content exceeds 5% by weight, the workability and long- However, the initial intensity expression can be delayed.

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 Et Lin Xi generated teuneun is the amount is reduced or the part of the transition to the mono-sulfate (AFm _{phase, C3A · CaSO 4 · 12H 2} O) according to the hydration proceeds. When anhydrous gypsum is added, etrinzite is formed from the beginning to densify the structure of the cement, thereby increasing the penetration resistance to chloride ions at early ages.

If the content of the gypsum anhydride exceeds 5% by weight, the initial strength development effect is excellent but the durability may be lowered. If the content of the gypsum anhydrite is less than 1% by weight, the initial strength development may be delayed.

The compound represented by the above formula (1) or (2) is used to prevent the salting-out of the concrete composition.

[ Formula 1 ]

(2)

The deterioration of the concrete due to the chloride occurs when the chloride reacts with the cement hydrate, Ca (OH) ₂ , to form crystals such as CaO · CaCl ₂ · 2H ₂ O and Mg ₂ (OH) ₃ Cl · 4H ₂ O, And partly due to the increase in porosity due to elution to the outside. However, deterioration of chloride ion (Cl ^- ) penetration into concrete is more serious than deterioration of concrete itself due to 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 the above formula (1) or (2) contains both an organic component and an inorganic component (Si and the like), thereby exhibiting a more preferable effect because it can be firmly, stably and uniformly mixed 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 at both ends of a urethane skeleton. Due to the above-mentioned structural features, the compound of the following formula 3 strongly bonds with not only organic components such as acrylic resin, siloxane resin and latex but also inorganic components such as cement and aggregate to form a three-dimensional network structure. Strength and durability.

(3)

In the above formula, n is a natural number of 1 to 10.

The concrete composition of the present invention may further contain at least one additive selected from colorants, curing accelerators, antifoaming agents, dispersants, ultraviolet light stabilizers, ultraviolet screening agents, inorganic fillers, emulsifiers, surfactants, viscosity regulators, , But is not limited thereto.

Examples of the coloring agents include extender pigments, coloring pigments and dyes. Exemplary pigments include calcium carbonate, magnesium carbonate, silica, silica-alumina, glass powder, glass beads, mica, graphite, barium hydroxide, talc, Kaolin, acid clay, activated clay, bentonite, diatomaceous earth, montmorillonite, dolomite, and the like, but the present invention is not limited thereto. Examples of the coloring pigment include titanium oxide, zinc oxide, carmine 6B (CI12490), phthalocyanine green (CI 74260), phthalocyanine blue (CI 74160), Mitsubishi carbon black MA100, perylene black (BASF K0084.K0086) LINOL YELLOW (CI 21090), LINOL YELLOW GRO (CI 21090), Benzidine Yellow 4T-564D, Mitsubishi Carbon Black MA-40, Victoria Pure Blue (CI 42595) 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. PIGMENT VIOLET 23 and the like can be selected and used, but the present invention is not limited thereto.

Examples of the hardening accelerator include at least one of phenol, nonylphenol, tertiary amine, mercaptan, dibutyl diacetate, dibutylenedilaurate, monobutylene oxide, and monobutylene chloride dihydroxide. But the present invention is not limited thereto.

As the antifoaming agent, BYK-A501 of BYK-Chemie, which is a main component of a polymer and polysiloxane solution which breaks bubbles is used. EFKA8203 of EFKA Co., and Perenol E8 of Impag Co., It is not limited.

As the dispersing agent, BYK- # 161, BYK- # 168, 1-methoxy-2 propylene acetate, BYK-Chemie, EFKA4048, EFKA, 4060 or the like may be selected and used, but the present invention is not limited thereto.

The inorganic filler is preferably at least one selected from the group consisting of calcium carbonate, talc, heavy carbon, 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 polyoxyethylene phenyl ether, and sodium dodecylbenzene sulfide, but is not limited thereto.

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

Hereinafter, the present invention will be described in more detail by way of examples. However, the following examples are intended to further illustrate the present invention, and 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.

Production Example 1 : Preparation of the indicated compound of formula (3)

In a three-necked reactor, Kopex-PEG-400 (concentrate) 112.6 g and dibutyltinlaurate 0.1 g were added to a heating device connected to a mechanical stirrer, a temperature sensor and a temperature sensor and stirred at room temperature. And 64.9 g of hexamethylene diisocyanate (HMDI) were placed and reacted. To the reaction solution, 322.1 g of pentaerythritol triacrylate (CAS Number 3524-68-3, manufactured by Sigma-Aldrich) and 0.2 g of methoxyhydroquinone were charged and the reaction was allowed to proceed at 75 for 3 hours. It was judged that the reaction was completed when the characteristic peak of isocyanate of 2260 cm -1 in the infrared spectrum completely disappeared. After completion of the reaction, 224 g of 3-trimethoxysilylpropyl glycidyl ether was added, and the reaction between the epoxy group of 3-trimethoxysilylpropyl glycidyl ether and the amine group contained in the urethane structure was carried out with stirring for 1 hour To proceed the desired compound.

Example 1 : Preparation of concrete composition

18 wt% of Portland cement, 3 wt% of butyl acrylate resin, 3 wt% of polydimethylsiloxane resin, 38 wt% of fine aggregate, 27 wt% of coarse aggregate and a weight ratio of styrene-butadiene copolymer and water 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 a compound of the following formula 1 were mixed in a mixer to prepare a concrete composition.

[ Formula 1 ]

Example  2: Preparation of concrete composition

18 wt% of Portland cement, 2 wt% of butyl acrylate resin, 2 wt% of polydimethylsiloxane resin, 38 wt% of fine aggregate, 27 wt% of coarse aggregate, a styrene-butadiene copolymer and water at a weight ratio of 5: 5 A concrete composition was prepared by mixing 3% by weight of liquid latex, 2% by weight of blast furnace slag, 2% by weight of anhydrous gypsum, 3% by weight of a salt inhibiting compound of the following formula 2 and 3% by weight of a compound prepared in Preparation Example 1 in a mixer .

(2)

Test Example 1 : Evaluation of properties of concrete composition

The compositions prepared in Examples 1 and 2 were mixed with water, molded into molds, and molded to produce boundary stones.

The physical properties of the barrier slats were evaluated by the methods described in the following Table 1, and the results are shown in Table 1 below.

Evaluation items result Reference value Test Methods The boundary stones made with the composition of Example 1 Tensile strength 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 The boundary stones made with the composition of Example 2 Tensile strength 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 shown in Table 1, the concrete composition of the present invention exhibited 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 further containing the compound of Formula 3 showed a more excellent effect.

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

(1) Test 1

To test the chlorine ion penetration resistance, the test specimens were prepared by cutting the boundary stone prepared in Test Example 1, which was 28 days old, to a thickness of 5 cm.

The diffusion cell was constructed with the above test piece, and the current measured every 30 minutes under the condition that the direct current power of 60 V was applied for 6 hours was integrated with respect to time.

Pass Charge (Coulomb) The boundary stones made with the composition of Example 1 0 The boundary stones made with the composition of Example 2 0

As shown in Table 2, it was confirmed that the test piece made of the concrete composition according to the present invention had a complete chlorine ion penetration resistance because the amount of passed charge was not measured.

Claims (1)

10-15% by weight of cementitious 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, 1 to 5% by weight of anhydrous gypsum, and 1 to 3% by weight of a compound represented by the following formula (1) or (2)
3. The concrete composition according to claim 1, further comprising 3 to 5% by weight based on the total weight of the composition.
[ Chemical Formula 1 ]

(2)

(3)

In the above formula, n is a natural number of 1 to 10.