KR101378895B1 - Color concrete composition and color concrete structure using thereof - Google Patents

Abstract

The present invention relates to a color concrete composition and a method for manufacturing a color concrete structure using the same, and more specifically, to a novel color concrete composition using a pigment having high dispersibility, and a method for manufacturing a high strength color concrete structure using the same. In the concrete composition including cement, water and aggregate, the present invention provides the color concrete composition, with respect to 100 parts by weight of cement, comprising: 0.5-20 parts by weight of titanium dioxide; and 0.5-5 parts by weight of a color former comprising water-dispersible colloid silica, a color pigment, a silane bonding agent, and an ionic block copolymer micelle. Provided was the method for enabling the manufacturing of various color concrete according to the present invention. The manufacturing method according to the present invention has excellent color expression properties to express various colors while using a small amount of titanium dioxide, and thereby having a decreased strength reduction for grey concrete and being advantageous in coloring.

Description

Color concrete composition and color concrete structure using same {COLOR CONCRETE COMPOSITION AND COLOR CONCRETE STRUCTURE USING THEREOF}

The present invention relates to a color concrete and a method for producing a color concrete structure using the same, and more particularly, to a new color concrete composition using a pigment having a high dispersibility and a method for producing a high strength color concrete structure using the same.

In order to improve the gray appearance of concrete, methods of using pigments in the manufacturing process have been used. Since the use of pigments has a problem of deteriorating the strength characteristics of concrete, color concrete is mainly used in the field of flooring materials such as roads. In the case of the flooring material, not only the required strength is lower than that of the structure, but also the colored concrete can be separately installed only on the surface of the road, so that it is easy to maintain the overall strength, and the cost is less depending on the use of the pigment.

Plans are also being developed for the colorization of concrete for structures requiring high strength. In Korean Patent No. 588192 granted to Samsung C & T, it is possible to implement white-color concrete, and at the same time, it is possible to complete the white-color concrete structure that meets the requirements of the designer or the structure by having required strength and durability. Discretion 320 ~ 500㎏ / ㎥, Unit quantity 155 ~ 175㎏ / ㎥, Unit aggregate aggregate 700 ~ 980㎏ / ㎥, Unit coarse aggregate 900 ~ 1000㎏ / ㎥, Water-binder weight ratio 35.0 ~ 50.0%, Fine aggregate rate 45.0 To 5 to 5% by weight of the binder further comprises 5 to 10% by weight of titanium oxide-based white pigment is further formulated, the binder is disclosed a white color concrete composition, characterized in that consisting of a back cement.

Samsung C & T has yet another patent application publication No. 2005-0098606 in which the weight ratio of water-cement is 30.0-50.0%, the fine aggregate ratio is 40.0-50.0%, and the inorganic concrete pigment or iron oxide (Fe3O4) is 5-10 for cement. By weight, carbon black (Carbon Black) discloses a black color concrete composition, characterized in that blended at 0.3 to 2% by weight based on the cement.

In addition, Korean Patent No. 686254, issued to Sampyo, discloses a white colored concrete composition containing 2 to 20 parts by weight of titanium dioxide (TiO 2) -methakaolin-based white pigment based on 100 parts by weight of white cement. . This patent uses titanium dioxide-metakaolin-based white pigments with excellent dispersibility, so that a uniform color can be expressed throughout the structure even in a small amount (based on titanium dioxide) compared to conventional titanium dioxide pigments. It is disclosed that the strength of the structure can be improved.

This method of producing colored concrete has a problem in that a specific composition range is used to maintain strength or a separate pigment such as titanium dioxide-metakaline has to be prepared. Accordingly, there is a continuing need for new color concrete that can be used more easily and has good dispersibility.

The problem to be solved in the present invention is to provide a new concrete composition with good color expression.

Another problem to be solved in the present invention is to provide a method for producing a new concrete composition with good color expression.

Another problem to be solved by the present invention is to provide a new high-strength concrete structure with good color expression, high strength.

In order to solve the above problems, the present invention is a concrete composition comprising cement, water and aggregate, 0.5 to 20 parts by weight of titanium dioxide with respect to 100 parts by weight of cement; It provides a colored concrete composition comprising; 0.5 to 5 parts by weight of a colorant composed of a water-dispersible colloidal silica, a color pigment, a silane binder and an ionic block copolymer micelle.

In the present invention, titanium dioxide having titanium crystals (Rutile), anatase and brookite crystal systems is mainly used as inorganic pigments used in color concrete. Titanium dioxide may be adjusted according to the color of the concrete and the content of the back cement included in the cement, and 0.5 to 20 parts by weight, preferably 1 to 10 parts by weight, and more preferably 2 to about 100 parts by weight of cement. 5 parts by weight may be used.

In the present invention, the coloring agent is preferably composed of 30 to 80% by weight of the water-dispersible colloidal silica, 5 to 40% by weight of the silane binder, 5 to 30% by weight of the ionic block copolymer, and 5 to 30% by weight of the color pigment.

In the present invention, the water-dispersed colloidal silica (colloid silica) is also called silica sol (silica sol), the particle size is generally 1-100nm, particles that are stably dispersed in the solvent without sedimentation is colloidal silica Means to be. The dispersed colloidal silica has -SiOH groups and -OH ions on the particle surface, has a double electric layer structure by alkali ions, and is in a stable state due to the repulsive force between the same negatively charged particles. Colloidal silica acts as a base material of the colorant which gives the compatibility of the colorant and cement, and when the content of the colloidal silica is low, the dispersibility of the colorant is inferior, and when the content of the colloidal silica is excessive, Will be less compatible.

The colloidal silica is described in J. Korean Ind. Eng. Chem., Vol. 17, No. 4, August 2006, 386-390 may be prepared by the method disclosed, it may be commercially available for use. In the practice of the present invention, the colloidal silica is SS-SOL 30E, SS-SOL 30, SS-SOL 30F, SS-SOL 30FH, SS-SOL 30FH2, SS-SOL 3080, SS-SOL 40, SS-SOL 50H, SS-SOL 30A and the like can be purchased commercially. It is preferable to use a product having a solid content of 50% by weight or less for the dispersion of the colloidal silica.

In the present invention, the silane binder acts as an emulsifier between the water-dispersible colloidal silica and the pigment. The silane binder may be 3-aminopropyltriethoxysilane (3-APTES), 3-mercaptopropyltrimethoxysilane (MPS), γ-glycidyloxypropyltrimethoxy silane (GOTMS) and the like, preferably 3-APTES. When the content of the silane binder is low, the compatibility between silica and the color pigment is inferior, and when the content of the silane binder is excessive, other contents of the coloring agent are too low.

In the present invention, the ionic block copolymer micelle is a negatively charged micelle, preferably a strong ionic block copolymer. The ionic block copolymer acts as a compatibilizer between the water-dispersible colloidal silica and the pigment together with the silane binder, thereby increasing the dispersibility of the pigment. When the amount of the ionic block copolymer is small, the compatibility may be lowered. When the amount of the ionic block copolymer is too large, other contents of the coloring agent may be too low.

In the practice of the present invention, the ionic block copolymer comprises an ionic styrenic block, for example, at least a portion of the styrene, preferably about 30 to 80% of the polystyrenesulfonate block is sulfonated do. In a preferred embodiment of the invention, the ionic block copolymer is poly (styrenesulfonate-b-methylbutylene).

In the present invention, the color pigment may be used azo, phthalocyanic, condensed polycyclic organic pigments, can be appropriately selected according to the concrete color to be expressed. When the content of the color pigment is too small, the color developability of the color developer is lowered. When the content of the color pigment is too large, only the amount of the pigment is increased without increasing the color development.

The color concrete composition according to the present invention includes cement, water, aggregate, titanium dioxide, and a coloring agent, and the components except the titanium dioxide and the coloring agent may be selected and used among the conventional ingredients in the art to which the present invention belongs. It is also not particularly limited.

For example, the colored concrete composition according to the present invention may comprise 20 to 55 parts by weight of water, relative to 100 parts by weight of cement binder, to obtain the desired color and structure strength; 150 to 400 parts by weight of fine aggregate passing by 85% or more by weight in a 5 mm sieve; It is preferable to include 150 to 400 parts by weight of coarse aggregate, which remains at least 85% by weight in a 5 mm sieve.

The cement binder is a component that expresses the strength of a concrete structure through a hydration reaction with water, such as white cement, cement (type 1 portland cement), blast furnace slag fine powder, limestone fine powder, metakaolin, and the like. Cementitious materials may be used. The white cement is a white hydraulic white portland cement, which is used to express the strength of the concrete structure and to express the color in the concrete composition.

Cementitious materials (cementitious materials) can be used as an additional component within the content range does not affect the properties of the concrete composition, preferably 100 parts by weight of the white cement, 0.001 to 60 parts by weight of blast furnace slag powder; 0.001 to 30 parts by weight of limestone fine powder; Metakaolin may be included in 0.001 to 25 parts by weight. The blast furnace slag fine powder, limestone fine powder and metakaolin can be used as a substitute for white cement as a component that can be used to improve the properties of the concrete composition, such as reducing the initial hydration temperature and enhancing long-term strength.

In addition, the water (water) is not particularly limited, but it is preferable to use tap water or groundwater that does not contain components that may affect the whiteness and strength. The fine aggregate may use natural sand or crushed sand that meets the above conditions, and the coarse aggregate may use natural or crushed gravel that meets the above conditions.

In addition to the above components, the white color concrete composition according to the present invention may further include a admixture such as a water reducing agent and an air entraining agent, the content of which is 100 parts by weight of the binder. It is preferably included in 0.0015 to 5 parts by weight.

Among the admixtures, the water reducing agent may be naphthalene-based or polycarboxylic acid-based to meet the slump quality standards of concrete, more preferably may be used a polycarboxylic acid-based high-performance water reducing agent, the air entrainer in the concrete composition It is a component that increases the amount of air.

According to the present invention a method is provided for producing colored concrete of various colors. The production method according to the present invention can express a variety of colors while using a small amount of titanium dioxide because of the good color expression, it is less strength degradation for gray concrete and is advantageous for colorization.

Hereinafter, the present invention will be described in detail with reference to examples. Although the following examples are described in detail, it should be understood that they are not intended to limit the invention, but are intended to be illustrative only.

Example

Preparation of Ionic Block Copolymers

Synthesis of S18MB25 (50).

S18MB25 block copolymer is a poly (styrenesulfonate-b-methylbutylene) (PSS-b-PMB) copolymer, which synthesizes styrene (S) and isoprene (I) monomers by cationic copolymerization and selectively hydrogenates isoprene to methylbutyl A len (MB) chain was formed. The integer value represents the degree of polymerization of each of the S and MB units. The solvent used cyclo nucleic acid. 50 represents 50% sulfonated styrene.

Using sec-butyl lithium as an initiator, styrene was polymerized at 45 ° C. for 4 h, and addition and polymerization of isoprene took place for 4 hours at the same temperature. Saturation of the SI copolymer proceeded with a homogeneous Ni-Al catalyst and at a pressure of 80 ° C. and 420 psi in a 2L Parr batch reactor. Ni-Al catalyst was used, and after the reaction was removed by treatment with 10% aqueous citric acid solution. The number average molecular weight of S18MB25 copolymer was 1.8-b-1.8 kg / mol, and the dispersity of the two polymers was less than 1.03. The styrene chain of the S18MB25 copolymer was partially sulfonated through the following procedure.

40 mL of 1, 2-dichloroethane and 1 g of S18MB25 were charged to a 100 mL three neck flask, heated to 40 ° C. and stirred until the copolymer was dissolved under N 2 atmosphere. Acetic sulfate was prepared by adding 1.8 mL of acetic enhydride and 5.4 mL of dichloroethane to a sealed N2 purged round bottom flask. The solution was cooled to 0 ° C. and 0.5 mL of 96% sulfuric acid was injected into the flask. Acetic sulfate was immediately added to a S18MB25 / dichloromethane mixture flask at 40 ° C. The reaction was terminated with 20 2-propanol. Samples with different degrees of sulfonation (SL) were obtained by adjusting the reaction time, and SL = 50 mol.% Was obtained by a 5 hour reaction. The polymer was purified, vacuum dried and recovered. The number average molecular weight of the S18MB25 (50) copolymer was 2.6-b-1.8 kg / mol.

Cement compounding raw material

As colloidal silica, SS Chemtech Co., Ltd. SS-SOL 30E was used, and S18MB25 (50) was used as prepared above. Pigment was used according to the color and silane binder was used 3-aminopropyltriethoxysilane (3-APTES). Cement was usually mixed with Portland cement and back cement, and sand and gravel were used as aggregate.

Example 1

150 parts by weight of water, 230 parts by weight of portland cement, 230 parts by weight of back cement, 770 parts by weight of sand, 1052 parts by weight of gravel, and 5.52 parts by weight of admixture, 10 parts by weight of titanium dioxide, 4 parts by weight of colloidal silica, 2 parts by weight of the blue pigment, 2 parts by weight of the silane binder, and 2 parts by weight of the ionic block copolymer were combined and solidified to prepare a blue colored concrete. Intensity was measured and shown in Table 1.

Example 2

150 parts by weight of water, 230 parts by weight of portland cement, 230 parts by weight of back cement, 770 parts by weight of sand, 1052 parts by weight of gravel, and 5.52 parts by weight of admixture, 10 parts by weight of titanium dioxide, 10 parts by weight of colloidal silica, 2 parts by weight of the red pigment, 3 parts by weight of the silane binder, and 3 parts by weight of the ionic block copolymer were combined and solidified to prepare a red colored concrete. Intensity was measured and shown in Table 1.

Example 3

150 parts by weight of water, 460 parts by weight of cement, 770 parts by weight of sand, 1052 parts by weight of gravel, and 5.52 parts by weight of admixture, and 10 parts by weight of titanium dioxide, 10 parts by weight of colloidal silica, 0.5 parts by weight of red pigment and blue 0.5 part by weight of the pigment, 3 parts by weight of the silane binder, and 3 parts by weight of the ionic block copolymer were combined and solidified to prepare a white colored concrete. Intensity was measured and shown in Table 1.

Example 4

150 parts by weight of water, 230 parts by weight of portland cement, 230 parts by weight of back cement, 770 parts by weight of sand, 1052 parts by weight of gravel, and 5.52 parts by weight of admixture, 20 parts by weight of titanium dioxide, 8 parts by weight of colloidal silica, 2 parts by weight of the red pigment, 3 parts by weight of the silane binder, and 4 parts by weight of the ionic block copolymer were combined and solidified to prepare a pale red colored concrete. Intensity was measured and shown in Table 1.

Comparative Example 1

150 parts by weight of water, 460 parts by weight of cement, 770 parts by weight of sand, 1052 parts by weight of gravel, and 5.52 parts by weight of admixture were combined, and 20 parts by weight of titanium dioxide was solidified to prepare a white colored concrete having a gray color. Intensity was measured and shown in Table 1.

Remarks Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Compressive strength  520 535 510 530 480

The standard value of the compressive strength (kgf / ㎠) was evaluated on the basis of 28 days strength, in order to calculate the average compressive strength of the color concrete prepared according to each embodiment according to the present invention, the color concrete samples prepared according to each example Six were selected and the average value of the measured compressive strengths was measured.

Claims (6)

In a concrete composition comprising cement, water and aggregate,
0.5 to 20 parts by weight of titanium dioxide based on 100 parts by weight of cement; Color dispersion composition 0.5 to 5 parts by weight of a water-soluble colloidal silica, a color pigment, a silane binder and an ionic block copolymer. The method of claim 1, wherein the colorant comprises 30 to 80% by weight of water-dispersible colloidal silica, 5 to 40% by weight of silane binder, 5 to 30% by weight of ionic block copolymer, and 5 to 30% by weight of color pigment. Precast concrete composition. The color of claim 1 or 2, wherein the silane binder is selected from the group consisting of 3-aminopropyltriethoxysilane (3-APTES), 3-mercaptopropyltrimethoxysilane (MPS), and γ-glycidyloxypropyltrimethoxy silane (GOTMS). Concrete composition. The color concrete composition according to claim 1 or 2, wherein the ionic block copolymer is a sulfonated polystyrene-b-polymethylbutylene block copolymer. The color concrete composition of claim 4, wherein the ionic block copolymer has a sulfonation degree of 50% of a styrene block. The color concrete composition of claim 1 or 2, wherein the pigment is any one of an azo, phthalocyanic, and condensed polycyclic organic pigment.