JP4824218B2 - Method for producing colored concrete kneaded material - Google Patents

Description

【００６３】
【表２】

【００６４】
３．着色コンクリ−ト混練物の製造およびその色調観察
１）製造［１］
表１に示すコンクリ−ト混練物１．５ｍ^３を２回製造し、順次、コンクリ−トアジテ−タトラックのアジテ−タ（容量；４．０ｍ^３）に投入して３．０ｍ^３（＝１．５ｍ^３×２）としたのち、表２に示すスラリ−Ａ〜Ｃをセメント１００重量部に対して顔料が３重量部となるように添加し、１５秒間撹拌して赤色コンクリ−ト混練物を製造した。
得られた赤色コンクリ−ト混練物の色調を目視観察し、色むらなどが観察されなかった場合を『○』、観察された場合を『×』と評価し、結果を表３に記載した。
【００６５】
２）製造［２］
最初に、コンクリ−トアジテ−タトラックのアジテ−タ（容量；４．０ｍ^３）にＮｏ．１のコンクリ−ト混練物１．５ｍ^３を投入し、前記スラリ−Ａ〜Ｃをセメント１００重量部に対して顔料が３重量部となるように添加し、１０秒間撹拌して赤色コンクリ−ト混練物を製造した。
【００６６】
次いで、該アジテ−タ中の赤色コンクリ−ト混練物に、さらに上記と同量のＮｏ．１のコンクリ−ト混練物およびスラリ−Ａ〜Ｃを添加し、１０秒間撹拌して３．０ｍ^３強の赤色コンクリ−ト混練物を製造した。
【００６７】
得られた赤色コンクリ−ト混練物について、上記製造［１］の場合と同様、色調の目視観察し評価を行い、結果を表３に併記した。
【００６８】
【表３】

【００６９】
１）製造［１］の赤色コンクリ−ト混練物の色調
実施例１〜４から、スラリ−Ａを添加した赤色コンクリ−ト混練物は、全体が均一な色調を帯び、色むらなどは全く認められなかった。
【００７０】
一方、減水剤を含まないスラリ−Ｂを添加した赤色コンクリ−ト混練物（比較例３、５および７）、流下時間が２０秒のスラリ−Ｃを添加した赤色コンクリ−ト混練物（比較例２、４、６および８）には、各例で濃淡に差異はあるが色むらが認められた。
２）製造［２］の赤色コンクリ−ト混練物の色調
実施例５から、赤色コンクリ−ト混練物に、同配合設計のコンクリ−ト混練物およびスラリ−Ａを追加添加して製造された赤色コンクリ−ト混練物が均一な色調を呈したのに対して、スラリ−Ｂを添加した場合は、骨材の地肌も見られる複雑な模様を呈し、スラリ−Ｃを添加した場合は、筋状の模様が生じるなど、それぞれに色むらが認められた。
【００７１】
【発明の効果】
本発明は、ミキサ−で製造したコンクリ−ト混練物を撹拌機に投入し、これに顔料・減水剤などを含み、かつ、特定の粘性を具備したスラリ−を添加混合することを特徴とし、これにより、
同一ミキサ−を用いて着色コンクリ−ト混練物を、引き続いて通常のコンクリ−ト混練物を製造しても、ミキサ−内の前者の残存物による後者が混入することを防止できるうえに、顔料を減水剤でもって十分に分散させスラリ−化してあるので、コンクリ−ト混練物全体に分散しやすく、該混練物を均一に着色させることができる、という効果を奏する。
【００７２】
本発明は、着色コンクリ−ト原材料の混練過程に着目し、改良を加えた発明であって、特殊な材料の使用、特殊な設備を要さないので、直ちに実施できる、というメリットも有している。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for producing a colored concrete kneaded material, and in particular, the former kneading in the case of continuously producing a colored concrete kneaded material and then a normal concrete kneaded material using the same mixer. The present invention relates to a method for producing a colored concrete kneaded material having an improved method.
[0002]
[Prior art]
In recent years, the amount of colored concrete used in residential districts, shopping districts, park pavements, structures, etc. is much smaller than the amount of regular concrete used, but the absolute amount gradually increases. It tends to increase.
[0003]
The colored concrete kneaded material is produced by blending “pigments” with “ordinary concrete raw materials” such as cement, aggregate, water reducing agent, and water.
[0004]
For example, when a colored concrete kneaded product is manufactured in a raw concrete factory, raw materials including pigments are sequentially weighed in accordance with a blending design, put into a mixer, kneaded, and then put into a concrete agitator truck. It is loaded, transported and placed while being stirred to the construction site.
[0005]
In that case, the raw concrete factory generally has a mixer for producing a normal concrete kneaded mixture. It is not equipped with a mixer. For this reason, the colored concrete kneaded material is currently manufactured using the same mixer by sewing between the production steps of a normal concrete kneaded material.
[0006]
[Problems to be solved by the invention]
After the colored concrete kneaded product is discharged, the mortar and paste containing the pigment adhere to the inner wall and lower part of the mixer and remain (hereinafter referred to as “residue”).
[0007]
Therefore, when a “normal concrete kneaded product” is manufactured following the preceding “colored concrete kneaded product”, the former residue is inevitably mixed into the latter kneaded product, resulting in an uneven color unevenness. It was caused to cause poor color tone (Note that different concrete agitator trucks are used for transporting colored concrete kneaded materials and ordinary concrete kneaded materials to the construction site. Residues adhering to the inner wall, lower part, etc. of the agitator are not mixed in the ordinary concrete kneaded material).
[0008]
Therefore, after producing and discharging a colored concrete kneaded product,
a) Spray high pressure water on the inner wall and lower part of the mixer to wash away the residue.
b) A small amount of ordinary raw material for concrete (or kneaded material) is put into a mixer, kneaded together with the residue and discarded.
After performing the above processes, a method for producing a normal concrete kneaded product has been adopted.
[0009]
However, since the methods a) and b) require time and cost, there is a problem that the productivity of the concrete kneaded product is lowered.
[0010]
The present invention has been made in view of the above problems, and its purpose is
In the case of producing a colored concrete kneaded material and then a normal concrete kneaded material using the same mixer,
It is an object of the present invention to provide a method for producing a colored concrete kneaded product capable of preventing the residue of the colored concrete kneaded product (including the pigment) from being mixed into a normal concrete kneaded product.
[0011]
[Means for Solving the Problems]
Roughly speaking, the present invention focuses on pigments. In a mixer, a colored concrete raw material not containing a pigment is kneaded, and the kneaded product and a slurry containing the pigment are mixed using separate equipment. By `` separating the mixer and the pigment ''
The present invention provides a method for producing a colored concrete kneaded material that achieves the above object.
[0012]
That is, the present invention (a method for producing a colored concrete kneaded product)
"・ When mixing blended concrete raw materials with a mixer, a process for producing a concrete kneaded product excluding the amount of water used in the slurry described later,
Pigment, water reducing agent and comprises the water, and, J ₁₄ B - flow time is 10 seconds or less of the slurry when measured with bets - preparing a
-A step of stirring the concrete kneaded material and the slurry using a stirrer "(Claim 1)
Is the gist.
[0013]
The present invention also provides:
The slurry contains 100 parts by weight of pigment, 0.5 to 5.0 parts by weight of water reducing agent (in terms of solid content) and 50 to 200 parts by weight of water (claim 2);
The agitator is an agitator mounted on a concrete agitator truck (claim 3);
The water reducing agent contained in both the concrete kneaded material and the slurry is the same type (Claim 4).
It is characterized by.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail.
[0015]
In the present invention, when simply referred to as “concrete kneaded product”, among the concrete raw materials formulated and designed to exhibit desired characteristics (color, strength, etc.), a pigment used in a slurry described later A kneaded product produced by kneading raw materials excluding the whole amount and a part of the water amount with a mixer.
[0016]
The present invention
(1) Use of a mixer only for the production of a concrete kneaded product (excluding a part of the amount of water),
(2) The slurry is separately prepared with a pigment, a water reducing agent and water, and (3) the concrete kneaded product and the slurry are mixed with a separately prepared stirrer,
As a result, since the residue of the concrete kneaded material (not including the pigment) is only attached to the inner wall and the lower part of the mixer, other normal concrete raw materials are subsequently used by using the mixer. Even when kneaded, the pigment is not mixed, and the kneaded product does not deteriorate color tone such as uneven color.
[0017]
The process for producing the concrete kneaded product will be described.
[0018]
The kneaded material produced from the concrete raw material that is blended and designed as the basis of the colored concrete kneaded material is not particularly limited.
-Normal concrete kneaded mixture of slump 5 to 21 cm,
-High flow concrete kneaded material with slump flow of 50 to 70 cm,
-Lightweight concrete kneaded material, porous concrete kneaded material, and the like.
[0019]
When these kneaded materials are actually kneaded by a mixer, a part of the blended and designed amount of water is used for the preparation of the slurry.
[0020]
The raw materials used for the concrete kneaded material are not particularly limited, and are commonly used cement, aggregate, water reducing agent, water, and the like.
[0021]
Examples of the mixer to be used include a batcher plant used in a raw concrete factory and a construction site, and a biaxial forced kneading mixer. In short, however, the concrete raw materials are continuously kneaded. This corresponds to a mixer that can be manufactured.
[0022]
Next, the process for adjusting the slurry will be described.
[0023]
The slurry pigment may be appropriately selected and blended from those conventionally used according to the desired color.
[0024]
Specific examples include inorganic powdered pigments such as bengara, titanium white, yellow lead, ultramarine blue, cobalt blue, and cobalt purple.
[0025]
These pigments may be used in combination of two or more.
[0026]
Since the pigment is a powder and its addition amount is small, the pigment is often added to the concrete kneaded material as it is and is not uniformly dispersed even when stirred.
[0027]
Therefore, a slurry is prepared using a water reducing agent and a part of the water amount as a pigment.
[0028]
The reason for using the water reducing agent is to prevent aggregation of the pigment in water, improve the dispersion, and facilitate the dispersion of the pigment into the kneaded mixture.
[0029]
The water reducing agent is separate from the water reducing agent contained in the concrete kneaded product by the blending design.
[0030]
Accordingly, the amount of the water reducing agent in the finally obtained colored concrete kneaded product is the total amount of the water reducing agent based on the blending design and the water reducing agent contained in the slurry.
[0031]
In addition, since the absolute amount of the water reducing agent contained in the slurry is small, there is almost no influence on the properties such as the strength of the colored concrete cured body.
[0032]
The water reducing agents used in the slurry are common, for example, lignin type, naphthalene sulfonic acid type, melamine type, polycarboxylic acid type water reducing agents for cement, AE water reducing agent, high performance water reducing agent, high performance AE water reducing agent, etc. These may be selected as appropriate from these, and two or more may be used in combination.
[0033]
As the water reducing agent used in the slurry, the same water reducing agent as that blended in the concrete kneaded material is preferable because the stirring with the concrete kneaded material can be carried out quickly.
[0034]
As described above, a part of the amount of water designed for blending with colored concrete is used for the water used in the slurry.
[0035]
Slurry - in the viscosity, J ₁₄ b - preparing the flow time measured by using preparative below 10 seconds, concrete - in order to improve the stirring of the bets kneaded product.
[0036]
The adjustment of the flow-down time is appropriately determined experimentally in consideration of the fineness of the pigment, the type / amount of the water reducing agent, the amount of water and the like.
[0037]
If the flow-down time exceeds 10 seconds, the viscosity is naturally high, stirring with the concrete kneaded product is insufficient, and the color tone may not be uniform. For example, when a concrete agitator track agitator, which will be described later, is used, the agitation is often insufficient because the agitation power is relatively weak.
[0038]
For example, when the above-mentioned agitator is used, the preferred flow time is determined from the workability of the slurry (specifically, difficulty such as slurry kneading and stirring into the concrete kneaded product), stirring time, etc. 4-8 seconds.
[0039]
The J ₁₄ B - measuring the flow time by preparative is obtained according to the Test Method of Flowability for PC grout (JSCE-F531-1994).
[0040]
Comprising a specified dimension J ₁₄ b - injecting a predetermined amount of the test trial grout bets,該Ro - a method of measuring the fluidity with a time flowing down from bets.
[0041]
The ratio of the pigment, water reducing agent and water constituting the slurry is based on the fineness of the pigment, the type of water reducing agent, the amount of water that can be used, the workability of the slurry, the stirring time, the cost, etc.
-Pigment: 100 parts by weight
Water reducing agent: 0.5 to 5.0 parts by weight (in terms of solid content) and water: 50 to 200 parts by weight are preferably prepared in each range.
[0042]
Slurry prepared in this range - is, J ₁₄ B - falling time of the exhibit approximately 4-8 seconds.
[0043]
The amount of water in the slurry should be applied within a range that does not hinder the kneading of the concrete kneaded material.
[0044]
The preparation of the slurry is not particularly limited, and it may be carried out using a conventional hand mixer or the like by putting a pigment, a water reducing agent and water into a container having an appropriate capacity.
[0045]
The amount of the slurry added to the concrete kneaded product is influenced by the type and combination of pigments used, color shade, and the like, and therefore the amount cannot be determined unconditionally.
[0046]
As a guide, if the slurry is added so that the pigment is in the range of 0.5 to 4 parts by weight with respect to 100 parts by weight of the cement contained in the concrete kneaded material, in most cases, almost no color is produced. Is possible.
[0047]
However, pigments differ depending on the type, but if the amount added is extremely large, the physical properties (eg, strength) of the colored concrete cured product will be reduced, so the limit of the amount added will be confirmed experimentally. It is preferable to keep it.
[0048]
Next, the stirring process of the concrete kneaded material and the slurry by the mixer will be described.
[0049]
The manufactured concrete kneaded material is charged into a stirrer from a mixer, and then a slurry is charged and sufficiently stirred to produce a colored concrete kneaded material.
[0050]
As the stirrer, both the concrete kneaded material and the slurry easily contain water and can be mixed, so that a conventional stirrer can be used (not particularly limited).
[0051]
As the stirrer, it is preferable to use an agitator loaded on a concrete agitator truck capable of simultaneously stirring and transporting to a construction site.
[0052]
Addition of the slurry to the concrete kneaded product must be agitated by the start of cement setting (starting). Therefore, in consideration of the stirring time, the slurry is added to the concrete kneaded material at a suitable time before the start of the setting and stirred.
[0053]
Although the stirring time depends on the type of the stirrer, tens of seconds are often sufficient. In the case of an agitator of a concrete agitator track, if the agitation is carried out for approximately 10 seconds or more, the concrete kneaded material and the slurry are almost uniformly mixed.
[0054]
It is preferable to use a mixer and a stirrer in which the latter has a slightly larger capacity than the former as much as the slurry is added.
[0055]
When the mixture of the colored concrete kneaded material is larger than the mixing amount required for placing both the mixer and the stirrer, the total amount of the concrete raw material blended and designed in the mixer and the agitator is charged. It can be produced by a single kneading and stirring operation.
[0056]
In addition, when the amount of caster is large and the capacity of the stirrer is large but the capacity of the mixer is small (when the capacity is mismatched), the concrete kneaded material kneaded by the mixer is put into the stirrer. Then, a pre-prepared slurry is added to a predetermined ratio and stirred, and then the second batch of concrete kneaded material and slurry are sequentially added to and added to the colored concrete kneaded material, followed by stirring operation. Thus, a required amount of colored concrete kneaded product can be produced.
[0057]
The above operation has the advantages that the kneading time is shortened and the color tone is hardly affected (see [Production [2] in [Example]).
[0058]
【Example】
(Examples 1-5, Comparative Examples 1-10)
Hereinafter, the present invention will be described based on examples.
[0059]
Four types of concrete kneaded materials and three types of slurries were produced and prepared, and both were stirred to produce a “red concrete kneaded material”, and the color tone was observed.
1. Raw materials used 1) Raw materials and cement for concrete kneaded materials: Ordinary Portland cement (manufactured by Taiheiyo Cement Co., Ltd.)
・ Slag: Blast furnace slag (Daiichi Cement Co., Ltd. “Fine Serament 10A”)
・ Fine aggregate: mountain sand [particle size 2.5mm or less]
・ Coarse aggregate:
A: Crushed stone No. 5 [particle size 13-20mm] (Ome)
B: Crushed stone No. 7 [particle size 2.5-5.0mm] (Ome)
・ Water-reducing agent: Melamine-based (“Mr. Co., Ltd.“ Reobuild NP20 ”)
・ Water: Tap water 2) Material for slurry ・ Pigment: Fe ₂ O ₃ powder (“Bayferox 960” manufactured by Bayer Co., Ltd.)
・ Water-reducing agent: Melamine-based (“Mr. Co., Ltd.“ Reobuild NP20 ”)
・ Water: Tap water (appropriate part of the water for the concrete kneaded material)
[0060]
2. Manufacture of concrete kneaded material, preparation of slurry 1) Manufacture of concrete kneaded material A biaxial forced kneading mixer (2.0 m ³ ) according to the formulation shown in Table 1 for the raw material for the concrete kneaded material. And kneaded for 4 minutes. 1-No. 4 were produced in 1.5 m ³ each.
The amount of water shown in Table 1 is the amount of water for formulation design. When manufacturing each concrete kneaded product, it was kneaded with the amount of water obtained by subtracting the amount of water used for slurry preparation from the blended design water amount (the amount of water used in the concrete kneaded product and the slurry is shown in Table 3. Are listed together).
In Table 1, No. 3 and no. 4 is a porous concrete, which was kneaded until the coarse aggregate was covered with mortar.
[0061]
2) Preparation of Slurry The slurry material was put in a container according to the blending amount shown in Table 2, and thoroughly mixed with a hand mixer to prepare three types of slurry A to C.
[0062]
[Table 1]

[0063]
[Table 2]

[0064]
3. Production of colored concrete kneaded material and observation of its color tone 1) Production [1]
A concrete kneaded material 1.5 m ³ shown in Table 1 was produced twice, and was sequentially charged into an agitator (capacity: 4.0 m ³ ) of a concrete agitator track, and 3.0 m ³ (= 1). 0.5 m ³ × 2), slurry A to C shown in Table 2 were added so that the pigment would be 3 parts by weight with respect to 100 parts by weight of cement, and the mixture was stirred for 15 seconds and mixed with red concrete. Manufactured.
The color tone of the obtained red concrete kneaded product was visually observed. The case where no color unevenness was observed was evaluated as “◯”, the case where it was observed was evaluated as “×”, and the results are shown in Table 3.
[0065]
2) Manufacturing [2]
First, No. is set in the agitator (capacity: 4.0 m ³ ) of the concrete agitator track. 1. Add 1.5 m ³ of the kneaded mixture of 1 and add the slurry A to C so that the pigment is 3 parts by weight with respect to 100 parts by weight of cement, and stir for 10 seconds. A kneaded product was produced.
[0066]
Next, the red concrete kneaded product in the agitator was further added with the same amount of No. 1 as above. 1 concrete kneaded mixture and slurries A to C were added and stirred for 10 seconds to produce a red concrete kneaded mixture of slightly over 3.0 m ³ .
[0067]
About the obtained red concrete kneaded material, the color tone was visually observed and evaluated in the same manner as in the case of the production [1], and the results are also shown in Table 3.
[0068]
[Table 3]

[0069]
1) Color tone of red concrete kneaded product of production [1] From Examples 1 to 4, the red concrete kneaded material to which slurry A was added had a uniform color tone as a whole, and color unevenness was completely recognized. I couldn't.
[0070]
On the other hand, a red concrete kneaded material to which slurry B containing no water reducing agent was added (Comparative Examples 3, 5 and 7), and a red concrete kneaded material to which slurry C having a flow-down time of 20 seconds was added (Comparative Example). In 2, 4, 6 and 8), color unevenness was observed although there was a difference in shade in each example.
2) Color tone of red concrete kneaded product of production [2] From Example 5, red color produced by additionally adding a concrete kneaded material and slurry A of the same blend design to the red concrete kneaded material While the concrete kneaded material showed a uniform color tone, when slurry B was added, it showed a complex pattern in which the background of the aggregate was also seen, and when slurry C was added, the streaks Uneven color was observed in each pattern.
[0071]
【The invention's effect】
The present invention is characterized in that a concrete kneaded product produced by a mixer is put into a stirrer, and a slurry containing a pigment, a water reducing agent and the like and having a specific viscosity is added and mixed thereto. This
Even if a colored concrete kneaded material is produced using the same mixer and a normal concrete kneaded material is subsequently produced, it is possible to prevent the latter from being mixed with the former residue in the mixer, and the pigment. Is sufficiently dispersed with a water reducing agent to form a slurry, so that it is easy to disperse throughout the concrete kneaded product, and the kneaded product can be uniformly colored.
[0072]
The present invention pays attention to the kneading process of the colored concrete raw material, and is an improved invention that has the advantage that it can be implemented immediately because it does not require the use of special materials and special equipment. Yes.

Claims (4)

A step of producing a concrete kneaded product, except for the amount of water used in the slurry described below, when the kneaded mixture raw material is kneaded with a mixer; J ₁₄ b - flow time is 10 seconds or less of the slurry when measured with bets - preparing a, and the concrete using a stirrer - DOO kneaded product and the slurry - in that it comprises a step of stirring the A method for producing a colored concrete kneaded product. 2. The colored concrete kneaded product according to claim 1, wherein the slurry contains 100 parts by weight of a pigment, 0.5 to 5.0 parts by weight of a water reducing agent (in terms of solid content), and 50 to 200 parts by weight of water. Manufacturing method. 2. The method for producing a colored concrete kneaded product according to claim 1, wherein the agitator is an agitator mounted on a concrete agitator truck. 3. The method for producing a colored concrete kneaded product according to claim 1, wherein the water reducing agent kneaded as the concrete raw material and the water reducing agent contained in the slurry are the same.