KR102283086B1 - Color plastering cement composition and Fineg dust reduction method using the plaster finish surface - Google Patents

Abstract

The present invention relates to a color hardening cement composition for extruding work of building/civil structures, and more particularly, a complex thickener and a complex compound are mixed in a binder including white cement, so that at the construction site, only water is poured and work can be started immediately. It relates to a pull-out color cement composition that prevents pigment agglomeration by premixing the entire composition including the pigment, so that the workability and finish are formed, and the occurrence of whitening is reduced.
The present invention relates to 100 parts by weight of a binder composition having an L value of 89.0 or more in the Hunter Lab color space, 20 to 50 wt% of white cement and 50 to 80 wt% of fine blast furnace slag powder, wherein the L value is 80.0 to 88.0, 0.2 to 0.5 parts by weight of a pigment, 0.2 to 0.5 parts by weight of a methylcellulose-based and polysaccharide-based complex thickener, and 0.3 to 0.6 parts by weight of an oleic acid-based metal soap salt complex compound are added, and in a weightless mixer at 20-40 rpm for 200-400 seconds By premixing, it is shipped so that only water can be poured at the construction site, and the plastic viscosity is 1,000 to 2,500 cp at a temperature of 25°C and a water-cement ratio of 60%.”

Description

Color plastering cement composition and fine dust reduction method using the plaster finish surface

The present invention relates to a color hardening cement composition for extruding work of building/civil structures, and more specifically, a complex thickener and a complex compound are mixed in a binder including white cement, so that at the construction site, only water is poured and work can be started immediately. It relates to a pull-out color cement composition that improves workability and finish and reduces the occurrence of whitening, but prevents pigment agglomeration by premixing the entire composition including the pigment.

In addition, the present invention relates to a method for reducing fine dust using a hardening surface that uses such color cement to adsorb and decompose fine dust on the inner and outer wall surfaces of a building under construction by spraying _{liquid TiO 2 during curing of the hardened surface.} is about

The interior and exterior of building/civil structures are finished by plastering with cement mortar or by applying cement paste after grinding the wall surface.

Among them, the excavation work is used to smooth the subsequent paint work or the final finishing material treatment work by smoothing the bubble marks or dent marks on the concrete surface.

Hereinafter, some prior art related to the extruded cement will be introduced.

1. Registered Patent No. 1320375 "Slag cement composition for excavation"

Patent No. 1320375 relates to a slag cement composition for pulling out by mixing Portland cement and fine blast furnace slag powder in a predetermined ratio, thereby improving the compression and adhesion strength of a material for pulling out and reducing the amount of voids and permeability of the pull out surface.

Specifically, "Portland cement is made by weight blending in a ratio of about 30 to 70% by weight and about 30 to 70% by weight of fine blast furnace slag powder, and the fine blast furnace slag powder has a density of 2.7 to 3.1 g/cm 3 and a specific surface area of 3000 to 5000 cm 2 / g, the cement composition further comprises a thickener to increase the viscosity, the thickener is to be added 0.01 to 1% when the total weight is 100% by weight, the thickener is cellulose It is characterized in that it is at least one of a cellulose derivatives type, an alkaliswellable type, a urethane associative type, and a natural thickener such as guar gum and arabic gum. A slag cement composition for pulling out" is provided.

2. Patent Publication No. 2014-0065176 "Cement composition for excavation"

Patent Laid-Open No. 2014-0065176 relates to a cement composition for excavation in which workability is improved by sufficiently securing pot life by applying a cellulose ether blended with two or more cellulose ethers having a degree of substitution within a specific range.

Specifically, "hydroxyalkylalkyl cellulose crosslinked with an aldehyde compound; and hydroxyalkyl cellulose crosslinked with an aldehyde compound; It provides a "cement composition for grouting comprising a cellulose ether admixture blended with".

3. Registered Patent No. 1313015 "Cement additive material and cement composition"

Patent Registration No. 1313015 relates to a cement additive material mainly using industrial waste as a raw material and a cement composition containing the cement additive material.

Specifically, "In the cement additive material containing calcium carbonate, gypsum, and blast furnace slag powder as industrial waste and not containing coal ash, the calcium carbonate is 6 to 160 parts by mass based on 100 parts by mass of the blast furnace slag powder. , wherein 5 to 150 parts by mass of the gypsum (in terms of anhydride) is blended, and the blending amount of the calcium carbonate is greater than the blending amount of the gypsum, and has an action of inhibiting the production of monosulfate in the cement plantain. Additives” are provided.

4. Registered Patent No. 0854516 "Powder type adhesive cement"

Patent Registration No. 0854516 relates to powdered adhesive cement manufactured by manufacturing adhesive cement in powder form, packaging and distribution, so that workers can mix and use an appropriate amount of water with powdered adhesive cement according to the purpose at the construction site.

Specifically, "For repairing and reinforcing walls or floors and reinforcing rock, 48 parts by weight of Kumgang yarn having a powder particle size of 16-35 mesh based on 52 parts by weight of powder cement, 8.2 parts by weight of a powdered phthalic acid plasticizer, hydroxypropyl methyl powder A powder adhesive cement mixed with powder including 1.5 parts by weight of cellulose, characterized in that it is mixed with powder having a color by further including 7 parts by weight of a cement colorant based on parts by weight of the powdered cement for coloring. Adhesive cement".

5. Registered Patent No. 1860793 "Cement composition for reducing whitening"

Registered Patent No. 1860793 relates to a hardening cement composition in which only water is poured at a construction site and work can be started immediately, workability and finish are improved, and the occurrence of whitening is reduced. Although it can be said that this invention is a prototype of the present invention, since the cement composition itself is designed to express bright colors as the base surface of the paint, there is no technical idea to uniformly express the color of the pigment.

1. Registered Patent No. 1320375 "Slag cement composition for excavation", 2013.10.23. Announcement 2. Patent Publication No. 2014-0065176 "Cement composition for excavation", 2014.05.29. open 3. Registered Patent No. 1313015 "Cement additive material and cement composition", 2013.10.01. Announcement 4. Registered Patent No. 0854516 "Powder type adhesive cement", 2008.08.26. Announcement 5. Registered Patent No. 1860793 "Whitening-reducing type hardening cement composition", 2018.05.24. Announcement

1. Minho Gong, Jeonggitaek Jeong, Yongwon Song, Seop Yoon, and Yongjeong Jeong, “Review of the characteristics of slag cement for excavation”, Proceedings of the 2014 Spring Conference of the Korean Concrete Society, v.26 n.1 (2014. 05.) 2. Chi-Ho Seo, Soon-Jo Hong, and Hyeon-Kyu Jeon, "An Experimental Study on Material Properties of Concrete Face Treatment Using Inorganic Composite", Journal of the Korean Concrete Society, v.13, n.3 (2001. 06.)

Conventional surface work uses a cement paste prepared by mixing OPC with a thickener and water at the job site, but it takes time to mix OPC, thickener and water at the job site, and it is difficult to express the necessary properties. Water splashing and bleaching occur on the cotton.

On the other hand, there is no example in which the color facing surface, which is the base surface for painting or tile pasting, is constructed with color, and even if the color facing surface is performed by mixing the pigment with the cement paste, a uniform color is not expressed due to the aggregation of the pigment.

The present invention is intended to solve all of the above-mentioned problems, and it is possible to obtain effects such as shortening of the work time, improvement of the workability of the extruding work, the finish of the facing work, and reduction of whitening, and to provide a uniform color of the extruding face. It is an object of the present invention to provide a color look-out cement composition.

In addition, another object of the present invention is to provide a method capable of adsorbing and decomposing fine dust introduced from the outside as well as reducing the generation of scattering dust at the construction site in connection with the extraction operation.

The present invention is a binder containing 20-50 wt% of white cement and 50-80 wt% of fine blast furnace slag powder having an L value of 89.0 or more in the "Hunter Lab color space, and the L value is 80.0-88.0 for solving the above-mentioned problems" To 100 parts by weight of the composition, 0.2 to 0.5 parts by weight of a pigment, 0.2 to 0.5 parts by weight of a methylcellulose-based and polysaccharide-based complex thickener, and 0.3 to 0.6 parts by weight of an oleic acid-based metal soap complex compound are added, and 20 to By pre-mixing at 40rpm for 200~400 seconds, it is shipped so that only water can be poured and used at the construction site, and it provides a colored cement composition characterized by a plastic viscosity of 1,000~2,500cp at a temperature of 25℃ and a water-cement ratio of 60%. do.

In addition, the present invention is "(a) mixing the color hardening cement composition with water so that the water-cement ratio is 60% to prepare a color hardening cement paste; (b) flattening the inner and outer wall base surfaces of the building, and applying the colored cement paste to create a face-out surface; and (c) spraying _{liquid TiO 2} during curing of the extruded surface; A method for reducing fine dust using a surface that includes a

According to the present invention, the following effects can be expected.

1. The present invention in which the thickener and binder are mixed can be used immediately by pouring only water at the work site, so the working time is greatly reduced.

2. The thickener applied to the hardening cement composition of the present invention is a composite thickener of methylcellulose and polysaccharide, and the polysaccharide has excellent material separation stability of the powder paste, thereby preventing bleeding and thus material separation It contributes to shortening the working time because remixing by the

3. By adding a metal soap salt complex compound to oleic acid, the water repellency of the finished surface is made to reduce water adsorption, thereby preventing the occurrence of whitening.

4. Under the condition of a paste with a water-cement ratio of 60%, the plastic viscosity of 1,000 to 2,500 cp is expressed at a temperature of 25°C to improve workability and finish.

5. By pre-mixing the pigment with the entire composition under the conditions set forth in the claims, it is possible to construct the embossed surface to express a uniform color without clumping the pigment.

6. By allowing the appearance of a specific color to be expressed during the construction process of the building structure, it is possible to obtain the engraving effect and publicity effect as a landmark by attracting the attention of the general public during construction, It is also useful as a background.

_{7. By spraying liquid TiO 2} on the pull-out surface, the TiO ₂ powder maintains the adhered state to the pull-out surface, and when fine dust is adsorbed on the pull-out surface, the nitrogen oxides and sulfur oxides of the fine dust are combined with the TiO ₂ powder. decomposes through a chemical reaction.

The present invention is "Hunter Lab (Hunter Lab) L value of 89.0 or more of white cement containing 20 to 50 wt% and blast furnace slag fine powder 50 to 80 wt%, the L value of 80.0 to 88.0 in 100 parts by weight of a binder composition, 0.2 to 0.5 parts by weight of a pigment, 0.2 to 0.5 parts by weight of a methylcellulose-based and polysaccharide-based complex thickener, and 0.3 to 0.6 parts by weight of an oleic acid-based metal soap complex compound are added, and in a gravity-free mixer at 20-40rpm for 200-400 seconds By pre-mixing, it is shipped so that only water can be poured at the construction site, and the plastic viscosity is 1,000 to 2,500 cp at a temperature of 25°C and a water-cement ratio of 60%.”

In the construction site, the thickening agent is usually mixed with OPC (Class 1 Ordinary Portland Cement) and the thickener is mixed at the construction site in an integrated form in which the thickener is pre-mixed for the purpose of improving the extraction operation more efficiently. It relates to a cement composition that can be used by pouring only water without a process.

In addition, the present invention adjusts the composition of the binder and includes a certain amount of the complex compound of the oleic acid-based metal soap salt to reduce the whitening phenomenon occurring on the surface of the oleic acid.

Cement for extruding to be spread widely on the wall surface requires a certain level of viscosity (plastic viscosity and yield value) and workability in the paste state. Accordingly, the cement for excavation provided by the present invention was made to develop a plastic viscosity of 1,000 to 2,500 cp (yield value of 200 to 500 D/cm 2 ) at a temperature of 25° C. under a paste condition of a water-cement ratio of 60%.

If the plastic viscosity is less than 1,000cp, the flatness (problem that the trowel does not slide well) is poor, and there is a problem in that the surface treatment of gombo is poor (gombo filling is poor). On the other hand, if the plastic viscosity exceeds 2,500cp, the excessive viscosity puts a strain on the wrist, so there is a problem that workers avoid the work in the paste mixing and trowel application. The plastic viscosity can be adjusted according to the mixing ratio of the methylcellulose-based and polysaccharide-based components constituting the complex thickener.

In Hunter Lab color space, L value represents brightness, a value represents chromaticity in green-red color range, and b value represents chromaticity in blue-yellow color range. In the case of OPC, the L value is less than 60.0, resulting in a dark gray color.

From the L value of 80.0, white is treated. The present invention relates to a color matching cement composition, and the color of the coloring cement is expressed by the pigment. Before mixing the pigment, the L value of the binder must be 80.0 or more to not affect the color expression of the pigment. In the present invention, a binder having an L value of 80.0 or more, including 20 to 50 wt% of white cement and 50 to 80 wt% of blast furnace slag fine powder, having an L value of 89.0 or more is used.

Hereinafter, the present invention will be described in detail along with specific experimental results.

[Table 1] below shows OPC (Comparative Example 1), slag cement (Comparative Example 2), and a case in which a thickener (methylcellulose-based, hereinafter 'MC thickener') was mixed with OPC in the conventional manner (Comparative Example 3) and The results of the viscosity test for the cement composition containing the complex thickener and the complex compound (Comparative Example 4) are shown. During the viscosity test, the temperature and the water-cement ratio were kept constant at 25°C and 60%, respectively. In Comparative Example 4, 50 parts by weight of OPC, 50 parts by weight of fine blast furnace slag powder, 0.4 parts by weight of a complex thickener (methylcellulose-based and polysaccharide-based mixture) and 0.4 parts by weight of a complex compound (oleic acid-based metal soap salt complex compound) were mixed. will be.

division plastic viscosity
(cp) surrender
(D/cm2) chromaticity L a b Comparative Example 1 436 27.7 - - - Comparative Example 2 268 49.7 - - - Comparative Example 3 4116 508 56.06 -1.60 6.41 Comparative Example 4 1356 272 63.82 -1.72 5.52

In Comparative Examples 1 and 2, it was found that since the plastic viscosity and the yield value were quite low, it was difficult to finish the work during the extruding operation, so that a thickener must be mixed. In Comparative Example 3, the plastic viscosity and yield value were greatly increased, but workability was lowered, so that the work efficiency of the operator was greatly reduced. When Comparative Example 4 is applied, the plastic viscosity is 1356 cp and the yield value is 272 D/cm 2 , indicating the plastic viscosity and yield value that can ensure proper finish and workability.

In addition, in the case of chromaticity, Comparative Example 3 has an L value of 56.0, which is dark gray, whereas Comparative Example 4 has 63.8, which is close to white. However, when a bright color (yellow) pigment is mixed with Comparative Example 4 above, the color appears cloudy. Accordingly, Example 1 in which the OPC of Comparative Example 4 was replaced with white cement having an L value of 89.0 or more (50 parts by weight of white cement, 50 parts by weight of fine blast furnace slag powder, 0.4 parts by weight of the complex thickener and 0.4 parts by weight of the complex compound mixed, The L value of the composition as a whole was 83.0), and the color was more vivid than that of Comparative Example 4. On the other hand, it was confirmed that even if the OPC of Comparative Example 4 was replaced with white cement as in Example 1, there was no significant change in plastic viscosity and yield value.

[Reference 1]

On the left side of [Reference Figure 1], 0.1 to 0.5 parts by weight of the yellow pigment in Example 1 was added relative to 100 parts by weight of the binder, and the right side was the yellow pigment in Comparative Example 4, 0.1 to 0.5 compared to 100 parts by weight of the binder. It is cured by adding parts by weight. The b value indicated in [Reference Fig. 1] represents the brightness (saturation) of yellow, and when 0.1 parts by weight of the pigment is added, it can be seen that the saturation is expressed almost twice as high in Example 1 as in Comparative Example 4.

If the L value of the binder composition in which the white cement and blast furnace slag fine powder are mixed is less than 80.0, the brightness and chroma when adding the pigment are low and thus not clear. If the L value exceeds 88.0, the effect of improving the brightness and chroma when adding the pigment is On the other hand, the ratio of white cement in the binder composition exceeds 50 wt %, and economic efficiency is deteriorated. Accordingly, it is preferable to limit the L value of the binder composition in which the white cement and the fine powder of blast furnace slag are mixed in the range of 80.0 to 88.0.

Similarly, if less than 0.1 parts by weight of the pigment is added relative to 100 parts by weight of the binder composition, the color for color production is insufficient. There is a risk of negatively affecting the expression of physical properties. Therefore, the amount of the pigment added is preferably limited to 0.1 to 0.5 parts by weight relative to 100 parts by weight of the binder composition.

[Table 2] and [Table 3] below show the change in chromaticity (Hunter Lab and CIE color space) according to the type of raw material that composes the binder and the mixing ratio (weight ratio). [Table 2] shows the chromaticity of the raw material and binder composition in the Hunter Lab color space, and [Table 3] is shown in the CIE Lab color space.

division Hunter WI
(C/2°) L (White/
Black) a(+:Red/
-:Green) b(+:Yellow
/-:Blue) white cement 100 90.50 91.27 -0.73 3.69 OPC 100 52.63 53.28 -0.72 7.78 slag 100 80.65 81.43 -0.02 5.44 OPC: slag 50:50 63.45 63.96 -0.70 6.05 Back cement: slag 30:70 82.39 83.11 -0.11 4.99 40:60 83.37 84.11 -0.15 4.89 50:50 84.12 84.83 -0.18 4.70 OPC: Back Cement: Slag 10:40:50 76.75 77.31 -0.37 5.08 20:30:50 72.36 72.93 -0.45 5.58 30:20:50 68.57 69.16 -0.48 6.03 10:30:60 76.80 77.42 -0.32 5.29 20:20:60 71.69 72.28 -0.40 5.73 30:10:60 68.50 69.10 -0.47 6.10 10:20:70 76.26 76.89 -0.29 5.45 20:10:70 72.13 72.73 -0.37 5.75 40:0:60 65.34 65.95 -0.50 6.49

division CIE WI
[D65/10°] L ^* White/
Black) a ^* (+:Red/
-:Green) b ^* (+:Yellow
/-:Blue) white cement 100 66.15 93.04 -0.29 3.66 OPC 100 -35.93 59.95 0.29 9.66 slag 100 38.06 84.97 0.64 5.6 OPC: slag 50:50 0.35 69.90 0.06 6.87 Back cement: slag 30:70 43.76 86.37 0.49 5.09 40:60 46.24 87.19 0.44 4.96 50:50 48.62 87.8 0.39 4.75 OPC: Back Cement: Slag 10:40:50 31.98 81.55 0.26 5.33 20:30:50 20.7 77.80 0.25 6.00 30:20:50 10.57 74.51 0.28 6.64 10:30:60 31.01 81.62 0.33 5.55 20:20:60 18.51 77.23 0.32 6.19 30:10:60 10.04 74.46 0.3 6.72 10:20:70 29.08 81.18 0.39 5.74 20:10:70 19.3 77.62 0.35 6.19 40:0:60 1.25 71.66 0.32 7.30

However, the components of pigments are different depending on the color, but since any color is in the form of a fine powder, the particles tend to agglomerate in the air. When the above pigments are mixed in a general way with the cement composition to be spread thinly on the surface of the surface, the finished surface is not neat after the operation due to aggregation of the pigment as shown in [Reference Fig. 2] below.

[Reference Figure 2]

Therefore, in the present invention, by premixing for 200 to 400 seconds at 20 to 40 rpm in a weightless mixer, a smooth surface finish can be achieved as shown in [Reference Fig. 3] below. When premixing at a rotation speed of less than 20 rpm or when the premixing time is less than 200 seconds, agglomeration of the pigment particles is not completely excluded.

[Reference 3]

[Table 4] below is a summary by measuring the workability, bleeding, wiping, water and whitening reduction performance for Comparative Example 3 and Example 1.

division
Workability (h) bleeding
(cc) wipeability
(Visual evaluation) water bear
(Visual evaluation) all sorts of flowers
(Visual evaluation) thickener
mix paste
manufacturing Comparative Example 3 One One 57 3 3 One Example 1 0 0.5 0 5 5 5

Workability was evaluated by the mixing time of the binder (cement) and the thickener, and the aging time from the time the paste was prepared by adding water to the thus mixed binder (cement) until the time of extruding. For bleeding, the amount of bleeding water that floated on the surface of the paste was collected with a dropper and the amount was measured.

Comparative Example 3 takes time to mix the thickener with OPC in the field, whereas Example 1 of the present invention is an all-in-one type that includes a thickener in advance and uses only water to mix, so the thickener mixing time is unnecessary in the field, and the paste manufacturing time is also compared Compared with Example 3, it was shortened to the level of 50%. When the thickener is mixed with cement in the conventional way, mixing takes a lot of force because of its high viscosity. Also, bleeding occurs during the settling time after making the paste, which requires re-mixing, which increases the paste production time.

On the other hand, in Example 1 of the present invention, mixing is effectively performed due to relatively low viscosity, and polysaccharides contained in the complex thickener (polysaccharides have excellent material separation stability of powder pastes, so in the present invention, MC is used for the purpose of preventing bleeding. Bleeding did not occur due to the use of mixing with a thickener), so the paste manufacturing time could be shortened.

Wipeability is very poor (1), bad (2), normal (3), good (4), very good (5) by visually observing the degree of wiping and sticking to the surface during exfoliation by brushing. ) to give an evaluation score. Mulgombo is a shape in which the voids on the concrete surface are filled with water by the extraction operation and the air that escaped is inflated and burst. ), poor (2), average (3), good (4), and very good (5).

In the case of Comparative Example 3, the wiping property by brushing was normal because of the high viscosity, whereas in Example 1 of the present invention, brushing was good and the brushing operation was excellent because it was evenly distributed on the surface. In addition, when Example 1 of the present invention was used, it was found that the water retention was greatly improved due to the effect of securing water retention and controlling bleeding.

For whitening, after applying the paste of Comparative Example 3 and Example 1 to the wall, respectively, lightly spraying water on the surface, and visually observing whether the surface turns white after 1 week has elapsed, very bad (1), bad (2) , average (3), good (4), and very good (5).

When the extraction operation was carried out in Comparative Example 3, whitening occurred, whereas when Example 1 of the present invention was applied, it was found that the whitening phenomenon did not occur, and in actual construction, compared to the conventional method (Comparative Example 3), It was confirmed that there was no whitening phenomenon in the case of construction with extruded cement.

This whitening reduction effect is due to the effect of oleic acid metal soap salt, and when rainwater (droplets) comes into contact with the finish surface, water penetrates in the existing method and causes whitening, but in the case of the present invention, It is water-repellent by the oleic acid-based metal soap salt, and the adsorption of water on the surface is less, preventing whitening.

In addition, the present invention is "(a) mixing the color hardening cement composition with water so that the water-cement ratio is 60% to prepare a color hardening cement paste; (b) flattening the inner and outer wall base surfaces of the building, and applying the colored cement paste to create a face-out surface; and (c) spraying _{liquid TiO 2} during curing of the extruded surface; A method for reducing fine dust using a surface that includes a

The step (a) is a step of preparing a cement paste having a water-cement ratio of 60%, and it is as described above that a plastic viscosity of 1,000 to 2,500 cp (yield value of 200 to 500 D/cm 2 ) is expressed at a temperature of 25 ° C.

The step (b) is a face-out operation step, and a face of a specific color is created by removing the unevenness of the concrete wall surface and applying the colored face-out cement paste.

The step (c) is a step of spraying _{liquid TiO 2 during curing of the slanted surface.} Liquid TiO ₂ refers to a state in which TiO _{2 powder is dispersed in water.} Since the TiO ₂ powder is white, it does not significantly affect the color expression of the facing surface, and depending on the TiO _{2 powder content of the liquid TiO 2} , the color of the facing surface may be expressed in pastel tones.

In addition, the liquid TiO ₂ may be sprayed on the curing surface, and thereafter, as the curing of the curing surface is continued, TiO ₂ may be maintained attached to the curing surface. Accordingly, the fine dust hitting the face is _{adsorbed to TiO 2} spray-attached to the face, and in this state, when light is received, nitrogen oxides (NO _x ) and sulfur oxides (SO _x ) of the fine dust are absorbed. It chemically decomposes to release carbon dioxide and water. Accordingly, fine dust generated at the construction site or introduced from the outside is adsorbed and decomposed on the inner and outer walls of the building under construction.

Although the present invention has been described in relation to the preferred embodiment as mentioned above, various modifications and variations are possible without departing from the gist of the present invention, and can be used in various fields. Accordingly, the claims of the present invention include modifications and variations that fall within the true scope of the preceding invention.

Claims (2)

In 100 parts by weight of a binder composition containing 20-50 wt% of white cement and 50-80 wt% of fine blast furnace slag powder having an L value of 89.0 or more in the Hunter Lab color space and having an L value of 80.0-88.0,
0.2 to 0.5 parts by weight of a pigment, 0.2 to 0.5 parts by weight of a methylcellulose-based and polysaccharide-based complex thickener, and 0.3 to 0.6 parts by weight of an oleic acid-based metal soap complex compound,
By premixing for 200~400 seconds at 20~40rpm in a zero-gravity mixer, it is shipped so that only water can be poured and used at the construction site.
Cement composition characterized in that the plastic viscosity is 1,000 ~ 2,500 cp under the condition of temperature 25 ℃ and water-cement ratio of 60%.
(a) mixing the color hardening cement composition of claim 1 with water so that the water-cement ratio is 60% to prepare a color hardening cement paste;
(b) flattening the inner and outer wall base surfaces of the building, and applying the colored cement paste to create a face-out surface; and
(c) spraying _{liquid TiO 2} during the curing of the face surface; A method of reducing fine dust using a face that includes a.