KR20050098607A - Composite for white-colored concrete - Google Patents

Abstract

The present invention relates to a white color concrete composition, and more specifically, adding an inorganic white pigment as a pigment capable of implementing a white color to a conventional concrete composition, but having required strength and durability, and having a required mixing ratio of white color. It relates to a concrete composition.

In particular, the present invention implements a white color concrete by appropriately adopting a titanium oxide as a white pigment, and can also adjust the color of the white color by further mixing the ordinary cement, at the same time having the required strength and durability of the bar designer It is possible to complete the structure of the white color concrete finishing to meet the requirements and characteristics of the structure.

Description

White color concrete composition {Composite for White-colored concrete}

The present invention relates to a white color concrete composition, and more specifically, adding an inorganic white pigment as a pigment capable of implementing a white color to a conventional concrete composition, but having required strength and durability, and having a required mixing ratio of white color. It relates to a concrete composition.

Recently, in the construction or civil engineering structures, various concretes have been applied to the design according to the intention of the designer or the characteristics of the structure. The application of tumble finish concrete is required.

Although colored concrete products have been introduced in the past, most of them have been manufactured and used for flooring for paving of roads, sidewalks, and motorcycles, rather than for structures. Because of this particular use, the emphasis is on improving permeability rather than color expression or strength. Has been developed. As a result, these conventional colored concrete products do not have the required strength and are difficult to apply as structural concrete as it is. Colors have also been biased towards red or green.

The present invention has been made to solve the above problems, to provide a white color concrete composition to implement a white color by adding an inorganic white pigment to a concrete composition having a suitable mixing ratio such as water, back cement, aggregate. have.

It is another object of the present invention to provide a white color concrete composition having the required strength and durability and having a blending ratio applicable for sacrificial finishing of the structure.

Since the color of concrete is generally light gray, it is necessary to use artificial additives to produce the required white color concrete. It is characterized in that it is blended, and further includes a normal cement of 50% by weight or less with respect to the amount of white cement to adjust the color of the white color.

The following table shows the compounding amount when white color concrete is applied to the structure. The usage amount was determined according to the Example mentioned later.

[Table 1] Compounding amount of white color concrete

Formulation White color concrete Weight ratio (%) W / B 35.0-50.0 S / (S + G) 45.0-50.0 Unit material amount (㎏ / ㎥) W 155-175 B 320 ~ 500 Back cement 160-500 Class 1 OPC 0-250 Pigment 16-50 S 700-980 G 900-1000 AD 1.6-10

Water (W) is the same mixing water as concrete, and suitable for groundwater, tap water, etc., which does not contain harmful substances, and its proper amount is determined according to the materials used. It acts as a factor affecting the fluidity and workability of concrete. If excessive, causing problems such as dry shrinkage, material separation, etc., the amount is determined in consideration of the blending weight ratio with the binder (B).

The binder (B) is a mixture of back cement and one type of OPC. Type 1 OPC is the same as ordinary cement used in ordinary concrete and its amount is determined by the unit quantity and water-binding ratio (W / B), and the strength of concrete is expressed through the hydration reaction. White cement is a pure white hydraulic white portland cement, used for coloring purpose to express white color. It plays a role of expressing required white color with pigment, and its amount is 50 ~ 100% by weight based on the amount of binder (B). use.

Inorganic pigments (Pigment) is generally stable compared to the organic pigments, there is a feature that does not change color, inorganic white pigments play an important role in realizing the white color with the back cement. That is, when the back cement primarily implements a white color, the inorganic pigment may be continuously maintained by preventing deformation of the white color. In addition, inorganic white pigments usually serve to dilute the gray color of the cement when the cement is further blended. In the present invention, titanium dioxide is used as an inorganic white pigment to express white color. Titanium oxide-based pigments are used as bleach for general paints, plastics and concrete, and have high dispersibility and strength expression properties as well as ecologically safe materials. The amount is 5 to 10% by weight based on the amount of the binder (B).

Sand (S) and gravel (G), which are used as aggregates, are generally used in concrete mixing and adopt the KS test standard.

Admixture (AD) uses general AE water reducing agent or high performance AE water reducing agent, and suitable amount should be selected by selecting naphthalene type and polycarboxylic acid type to meet concrete slump quality standard. 2.0 wt% is used.

The water-binder ratio (W / B) is a weight ratio of the unit quantity and the binder mass, and determines the strength and durability of concrete, such as design reference strength and compounding strength. In the case of applying the white color concrete of the present invention for a structure, it is preferable to mix so as to have a W / B of 35.0 to 50.0% corresponding to the design reference strength of 21 to 40 Mpa for proper strength and durability.

Residual aggregate ratio (S / (S + G)) is a numerical value which determines the fluidity of concrete as the volume ratio of sand (S) to the volume of total aggregate (sand (S) + gravel (G)). Accept values similar to those in.

A defoaming agent may be added to secure an appropriate amount of air, and in the case of a slab member, it is preferable to further add a shrinkage reducing agent to minimize cracking caused by slab shrinkage. The shrinkage reducing agent is suitably 2.0 to 4.0% by weight based on the amount of the binder.

<Example 1>

TABLE 2 Mixing ratio of white color concrete composition-indoor blending

Formulation White color concrete Weight ratio (%) W / B 41 S / (S + G) 47.5 Unit material amount (㎏ / ㎥) W 165 B (C + FA) 402 Back cement 402 Class 1 OPC 0 Pigment 40.2 S 834 G 926 AD 3.62

As a material source of the material used, water (W) is tap water, union back cement (for concrete), back pigment (Pigment) is Bayertitan (Bayer), sand (S) is Incheon cleaner, aggregate (G). The crushed aggregate (19mm Gwangju, Taesan aggregate), and the admixture (AD) was a polycarboxylic acid-based high performance AE water reducing agent. As can be seen from the table, the pigment (Pigment) and admixture (AD) used 10% and 0.9% by weight, respectively, based on the amount of the binder (B). In addition, in order to secure an adequate amount of air, the antifoaming agent was added in an amount of 0.02% by weight based on the amount of the binder (B).

Experimental results according to Example 1

[Table 3] Physical properties of the white color concrete of the blending ratio according to Example 1

Slump (cm) Air volume (%) Temperature (℃) Compressive strength (kgf / ㎠) 0 min 60 minutes 0 min 60 minutes 3 days 7 days 28 days 24.0 22.5 3.9 3.8 18.5 289 361 489

Table 3 shows the results of testing the physical properties of the concrete blended in the blending ratio according to Example 1. The property test results of the unconsolidated concrete considered the change over time for 60 minutes in consideration of the transport time until the arrival of the site.

FIG. 1 is a photograph of a reduced model member manufactured by using a mixing ratio of white color concrete according to Example 1, and a model was manufactured to examine color expression and constructability. As shown in Figure 1, the color expression of the reduced model member was good, and the physical properties also satisfied the construction properties, in particular, the compressive strength showed high strength expression.

<Example 2>

Table 4 Mixing Ratio of Indoor Color Concrete Compositions-Indoor Blending

Formulation White color concrete Weight ratio (%) W / B 40.0 S / (S + G) 47.5 Unit material amount (㎏ / ㎥) W 160 B 400 Back cement 280 Class 1 OPC 120 Pigment 40.0 S 836 G 925 AD 2.8

As the material source of the material used in the same manner as in Example 1, water (W) is tap water, union back cement (for concrete), back pigment (Pigment) Bayertitan (Bayer), sand (S) is Incheon washing G, aggregate (G) was used as crushed aggregate (Gwangju Exodus Taesan aggregate 19mm), admixture (AD) was used as a polycarboxylic acid-based high-performance AE water reducing agent, except that in Example 1, one type of OPC, that is, ordinary cement was further added. . As can be seen from the above table, the type 1 OPC, pigment and admixture (AD) used weight percent of 30, 10 and 0.7 based on the amount of binder (B), respectively. In addition, in order to secure an adequate amount of air, the antifoaming agent was added in an amount of 0.02% by weight based on the amount of the binder (B).

Experimental results according to Example 2

[Table 5] Physical properties of the white color concrete of the blending ratio according to Example 2

Slump (cm) Air volume (%) Temperature (℃) Compressive strength (kgf / ㎠) 0 min 60 minutes 0 min 60 minutes 3 days 7 days 28 days 23.0 19.5 2.8 2.7 18.8 214 342 495

Table 5 shows the results of testing the physical properties of the concrete blended in the blending ratio according to Example 2.

FIG. 2 is a photograph of a reduced model member manufactured using a white color concrete having a mixing ratio according to Example 2, and a model manufacturing operation was performed to examine color expression and workability. As shown in FIG. 2, the white color expression of the reduced model member was slightly lower than that of Example 1, which is likely due to the addition of cement. Physical properties met the required quality standards. Therefore, it is usually expected to be able to control the color of the white color by controlling the amount of cement.

<Example 3>

Table 6 Production of White Color Concrete Composition Ratio-Ready-mixed Concrete B / P

Formulation White color concrete Weight ratio (%) W / B 40.0 S / (S + G) 47.5 Unit material amount (㎏ / ㎥) W 160 B 400 Back cement 280 Class 1 OPC 120 Pigment 40.0 S 836 G 925 Shrinkage reducing agent 16.0 AD 2.8

In Example 3, it was made the same as the material and the blending amount of Example 2, and only 16.0 kg / m 3 of shrinkage reducing agent was added. That is, in this embodiment, when the pouring member is a bottom slab, a shrinkage reducing agent was used in an amount of 4.0 wt% based on the binder (B) in order to minimize cracking of the slab in consideration of cracking caused by shrinkage of the slab. Flowmix-SPA was used as a shrinkage reducing agent.

Experimental results according to Example 3

[Table 7] Physical properties of the white color concrete of the blending ratio according to Example 3

Slump (cm) Air volume (%) Temperature (℃) Compressive strength (kgf / ㎠) 0 min 60 minutes 0 min 60 minutes 3 days 7 days 28 days 24.0 20.0 3.2 3.0 16.8 201 251 -

Table 7 shows the results of testing the physical properties of the concrete blended in the blending ratio according to Example 3.

FIG. 3 is a photograph of a field mock-up member manufactured using a white-collar concrete having a mixing ratio according to Example 3, and a mock-up of the actual mock-up (3.6m × 3.6m × 0.15m) is performed to examine color expression and workability. Work was done. The physical properties met the required quality standards, and the color appearance of the surface was also transferred.

According to the present invention of the configuration as described above it is possible to implement the concrete of the white color and at the same time having the required strength and durability it is possible to complete the structure of the white color concrete offering finish that meets the requirements of the designer or the characteristics of the structure.

1 is a photograph of a reduced model member manufactured using the concrete composition of <Example 1>.

Figure 2 is a photograph of a reduced model member produced using the concrete composition of <Example 2>.

3 is a photograph of an actual model member (slab) manufactured using the concrete composition of <Example 3>.

Claims (7)

In concrete compositions, including water, back cement, aggregates, White color concrete composition, characterized in that it further comprises an inorganic white pigment. In claim 1, The inorganic white pigment is a white color concrete composition, characterized in that the titanium oxide. The method of claim 1 or 2, The weight ratio of water-cement is 35.0 to 50.0%, the fine aggregate ratio is 45.0 to 50.0%, and the inorganic white pigment or titanium oxide pigment is white color concrete composition, characterized in that it is blended at 5 to 10% by weight with respect to cement. . In claim 3, The white color concrete composition is a white color concrete composition, characterized in that it further comprises a shrinkage reducing agent of 2.0 to 4.0% by weight relative to the cement. The method of claim 1 or 2, The white color concrete composition is a white color concrete composition, characterized in that it further comprises 50% by weight or less of the normal cement with respect to the back cement. In claim 5, When the mixing of back cement and ordinary cement is called binder, The weight ratio of the water-binding material is 35.0 to 50.0%, the fine aggregate content is 45.0 to 50.0%, and the inorganic white pigment or titanium oxide pigment is a white color concrete composition, characterized in that it is blended 5 to 10% by weight relative to the binder. . In claim 6, The white color concrete composition is white color concrete composition, characterized in that further comprises a shrinkage reducing agent of 2.0 to 4.0% by weight relative to the binder.