JP2003293519A - Anchoring material for pc steel material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an anchoring material for a PC steel material having elasticity even after a curing, smoothly transmitting stress and following the expansion and contraction of the PC steel material. <P>SOLUTION: In the anchoring material for the PC steel material carried to the PC steel material and used for anchoring the PC steel material on concrete when prestressed concrete is manufactured, the anchoring material is formed by mixing a composite polymer emulsion using an acrylic acid ester copolymer as a main component and a chief material using silicon oxide, calcium oxide and iron oxide as main components. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixing material for a PC steel material used for fixing a PC steel material disposed inside concrete when manufacturing prestressed concrete (hereinafter referred to as PC) to surrounding members. It is about.

[0002]

2. Description of the Related Art Conventionally, a construction method for prestressing a concrete member to reinforce the tensile strength of the concrete member is known, and as such a construction method, a pre-tension method and a post-tension method are known. There is.

In the pre-tension system, a PC steel material to which a tensile force has been applied in advance is placed in a formwork, concrete is placed in the formwork, and after the concrete hardens to reach a sufficient strength, the PC steel material is This is a method of pretensioning the concrete by loosening the tensile force and adhering the concrete and the PC steel material.

In the post-tension system, a pipe called a sheath tube in which PC steel is inserted is arranged in a form, concrete is placed in the form, and the PC steel in the pipe is tensioned after the concrete hardens. This is a method of prestressing concrete by fixing the PC steel material in a tension state with a fixing tool.

In any of the methods, the periphery of the PC steel material is covered with an injection material such as mortar for fixing the PC steel material to the surrounding members, and the injection material is changed over time. By hardening, the PC steel material and surrounding members, that is, concrete, sheath tube, and the like were integrated.

[0006]

However, as described above, when the injection material injected into the sheath tube is completely hardened as represented by mortar, it has almost no followability, and it is difficult to pull it. Even if a PC steel material having strength is introduced into a concrete member, the PC steel anchoring material may peel off without following the expansion and contraction of the PC steel material, so that the tensile strength of the concrete member can be sufficiently reinforced. There were times when I couldn't.

Therefore, when an excessive pressure is applied to the concrete member from above, a crack is generated in the lower portion of the concrete member as in the case of the conventional concrete member in which the PC steel material is introduced but the PC steel material is not introduced. There was a risk that

Therefore, according to the present invention, the PC
An object of the present invention is to provide a fixing material for a PC steel material which can follow the expansion and contraction of the steel material.

[0009]

[Means for Solving the Problems] That is, according to the present invention as set forth in claim 1, in the production of prestressed concrete, a fixing material for a PC steel material for supporting the PC steel material and fixing the PC steel material on the concrete is provided. Yes, the same PC
A PC characterized in that a fixing material for steel material is produced by mixing a composite polymer emulsion containing an acrylic acid ester copolymer as a main component and a main material containing silicon oxide, calcium oxide and iron oxide as a main component. The purpose is to provide a fixing material for steel materials.

According to the second aspect of the present invention, when the prestressed concrete is manufactured, P which is arranged in the protective pipe is used.
A fixing material for a PC steel material for supporting the C steel material and fixing the PC steel material to a protective tube, the fixing material for the PC steel material being a composite polymer emulsion containing an acrylic acid ester copolymer as a main component, It is intended to provide a fixing material for PC steel, which is produced by mixing a main material containing silicon oxide, calcium oxide and iron oxide as main components.

According to the third aspect of the present invention, when the prestressed concrete is manufactured, P which is arranged in the protective pipe is used.
A fixing material for a PC steel material for supporting the C steel material and fixing the PC steel material to a mortar filled in a protective tube,
The fixing material for the PC steel material is a composite polymer emulsion containing an acrylic acid ester copolymer as a main component, silicon oxide,
It is intended to provide a fixing material for PC steel, which is produced by mixing a main material containing calcium oxide and iron oxide as main components.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention is carried on a PC steel material used for applying a tensile force to concrete in the process of producing prestressed concrete (PC),
It is a fixing material for PC steel that fixes C steel to surrounding members, and mixes a main material containing silicon oxide, calcium oxide, and iron oxide as a main component with a composite polymer emulsion containing an acrylic ester copolymer as a main component. It is generated by

The fixing material for PC steel of the present invention has elasticity even after hardening and can smoothly transmit stress.
Therefore, the fixing material for the PC steel material can follow the expansion and contraction of the PC steel material, and the tensile force of the PC steel material can be reliably transmitted to the concrete.

Further, since the fixing material for the present PC steel material has high adhesiveness and anticorrosiveness, the fixing material for the present PC steel material can surely fix the PC steel material to the member around the PC steel material and the PC. The steel material can be protected from ingress water to prevent corrosion.

Further, the fixing material for steel materials of the present PC has a high durability and its properties are stable for a long period of time.
It is possible to maintain the tensile strength of prestressed concrete (PC) using the anchoring material for steel for a long period of time.

In the composite polymer emulsion, for example, a cyclohexyl methacrylate-styrene copolymer is used as an acrylic ester copolymer as a main component,
The same cyclohexyl methacrylate-styrene copolymer,
Furthermore, with a carboxy-modified styrene-butadiene copolymer,
It can be produced by mixing a cyclohexyl methacrylate-styrene copolymer as an acrylic acid ester copolymer and a fatty acid soap.

As the main material, white cement or Portland cement containing silicon oxide, calcium oxide or iron oxide as a main component may be used, and silica cement containing silica oxide, calcium oxide or iron oxide as a main component may be used. It is also possible to use a compound produced by mixing or a ceramic powder.

Further, the present fixing material for PC steel can be used both when the prestressed concrete (PC) is manufactured by the pretensioning method and when it is manufactured by the posttensioning method.

When the fixing material for this PC steel material is used in the pre-tension system, the fixing material for this PC steel material is
Since the PC steel material can be fixed to the surrounding concrete by supporting it on the steel material, the tensile force of the PC steel material can be transmitted to the concrete, and the concrete can be reliably prestressed.

In particular, since the fixing material for PC steel of the present invention has high adhesion, rust prevention and durability as described above, it is possible to firmly fix the PC steel to concrete, and P
The C steel material can be protected from infiltration water to prevent corrosion, and the tensile strength of concrete can be maintained for a long period of time.

On the other hand, when the fixing material for the present PC steel material is used in the post-tension system, the fixing material for the present PC steel material is carried on the PC steel material arranged in the protective tube to fix the PC steel material to the protective tube. In some cases, the fixing material for the PC steel material is carried on the PC steel material disposed in the protective tube, and the PC steel material is fixed to the mortar filled in the protective tube.

In the former case, only the fixing material for PC steel according to the present invention is interposed between the PC steel and the protective tube,
Since the tensile force of the PC steel material can be reliably transmitted to the concrete through the protective pipe, the concrete can be more reliably prestressed.

Moreover, in the former case, the layer of the fixing material for the present PC steel material to be carried on the PC steel material becomes thick, so that the present PC
The adhesion, rust prevention and durability of the fixing material for steel materials can be sufficiently exerted on the PC steel material to securely fix the PC steel material to the protection tube, and more reliably corrode the PC steel material inside the protection tube. In addition, the tensile strength of concrete can be maintained for a longer period of time.

On the other hand, also in the latter case, the tensile force of the PC steel material can be transmitted to the concrete through the protective pipe and the mortar filled in the protective pipe to surely prestress the concrete.

Moreover, since the present fixing material for PC steel has high adhesiveness, rust prevention and durability as described above, it is possible to surely fix the PC steel on the mortar filled in the protective tube, and The steel material can be protected from infiltration water to prevent corrosion, and the tensile strength of concrete can be maintained for a long period of time.

[0026]

The present invention will be described in more detail below with reference to Examples 1 to 3.

Each of Examples 1 to 3 was prepared by adding a main material specific to each Example to a composite polymer emulsion as a dispersion in water which was previously formed.

[0028]

[Table 1]

Table 1 above describes the composition of the composite polymer emulsion. Such a composite polymer emulsion is prepared by first dissolving a fatty acid soda soap in water to emulsify it, gradually adding a carboxy-modified styrene-butadiene copolymer to this emulsion with stirring, and then adding acrylic acid to the resulting mixture. It was produced by gradually adding cyclohexyl methacrylate-styrene copolymer latex as an ester copolymer while stirring.

[0030]

[Table 2]

In Table 2 above, the compositions of the main materials of Examples 1 to 3 are described.

The main material of Example 1 was to put white cement in a mixer and stir it. Further, iron oxide, zinc white, titanium white,
Glycine and the like were sequentially added with stirring and mixed so as to be uniform.

In the main material of Example 2, coarse silica sand was burned to remove organic substances, and then the particle size was adjusted to a range of 50 to 210 μm, and the mixture was placed in a mixer and stirred, and white cement was gradually added while stirring. Was added to the mixture, and iron oxide, zinc white, titanium white, glycine, and the like were sequentially added to the mixture while stirring, and the mixture was mixed uniformly. In addition, the silica sand whose particle size is adjusted in the range of 50 to 210 μm is generally called No. 7 silica sand,
The mixture of No. 7 silica sand and white cement is called Compound No. 7.

The main material of Example 3 was prepared by baking coarse silica sand to remove organic substances, adjusting the particle size to 70 to 430 μm, and putting the mixture in a mixer for stirring. Was added to the mixture, and iron oxide, zinc white, titanium white, glycine, and the like were sequentially added to the mixture while stirring, and the mixture was mixed uniformly. The silica sand with the above grain size adjusted in the range of 70 to 430 μm is generally called No. 6 silica sand,
The mixture of No. 6 silica sand and white cement is called compound No. 6.

The composition of the white cement used as the main material in Examples 1 to 3 is shown in Table 3 below.

[0036]

[Table 3]

The composite polymer emulsions and base materials used in Examples 1 to 3 were produced as described above.

Then, in Example 1, an additive comprising a highly condensed triazine compound was added to the above composite polymer emulsion in an amount of 3% by weight based on the composite polymer emulsion.
To prepare a fixing material for PC steel by gradually adding the main material to the mixture of the composite polymer emulsion and the additive while stirring, and continuing stirring for 3 to 5 minutes. did. The weight ratio of the composite polymer emulsion to the main material was (composite polymer emulsion) :( main material) = 1: 3 to 4, and water was appropriately added as necessary during the production process.

As the above additive, trade name Rheobuild NL-4000 (manufactured by NMB Co., Ltd.) can be used. Such an additive is a liquid additive containing a melamine resin as a main component, which can be obtained by reacting melamine and formamide.

Also, in Example 2, the above-mentioned composite polymer emulsion was added with the above-mentioned highly condensed triazine-based compound additive in an amount of 3% by weight with respect to the composite polymer emulsion, and the mixture was stirred. The main material was gradually added to the mixture consisting of and the additive while stirring, and the fixing material for PC steel was manufactured by continuing stirring for 3 to 5 minutes. The weight ratio of the composite polymer emulsion to the main material was (composite polymer emulsion) :( main material) = 1: 3 to 4, and water was appropriately added as necessary during the production process.

Further, in Example 3, the above-mentioned composite polymer emulsion was added with the above-mentioned highly condensed triazine-based compound additive in an amount of 3% by weight with respect to the composite polymer emulsion, and the mixture was stirred. The main material was gradually added to the mixture consisting of and the additive while stirring, and the fixing material for PC steel was manufactured by continuing stirring for 3 to 5 minutes. The weight ratio of the composite polymer emulsion to the main material was (composite polymer emulsion) :( main material) = 1: 3 to 4, and water was appropriately added as necessary during the production process.

Although white cement is used as the main material in Examples 1 to 3 above, Portland cement may be used instead of the white cement. Further, ceramic powder can be used instead of the silica sand used in Examples 2 and 3. The composition of the ceramic powder used in this case is shown in Table 4 below.

[0043]

[Table 4]

The fixing materials for PC steel materials of Examples 1 to 3 produced as described above were in the form of water-soluble slurry,
It had the following physical properties.

[0045]

[Table 5]

Next, prestressed concrete (P
An example of use of the fixing material for PC steel of Examples 1 to 3 in C) will be described. In addition, P of any of Examples 1 to 3
Since the fixing material for C steel material has the same method of use, hereinafter, the fixing material for PC steel materials of Examples 1 to 3 is simply referred to as the fixing material A for PC steel material.

FIG. 1 shows prestressed concrete (P
It is a figure explaining the structure of C), (a) is explanatory drawing by the side view of the beam 1 formed by PC, (b) is sectional explanatory drawing by the same front view, (c) is normal. It is explanatory drawing by the side view of the beam 1'formed by concrete, (d) is sectional explanatory drawing by the same front view.

The tensile strength, compressive strength and bending strength of the beam 1 made of PC shown in FIGS. 1 (a) and 1 (b) and the beam 1 made of ordinary concrete shown in FIGS. 1 (c) and 1 (d). It is equivalent to the tensile strength, compressive strength, and bending strength of '. Further, in the figure, D is the thickness of the beam 1 made of PC, and D'is the thickness of the beam 1'made of ordinary concrete.

As shown in FIGS. 1 (a) and 1 (b), the PC has a structure in which the PC steel material 2 is built in concrete, and the PC has a structure as shown in FIGS. 1 (c) and 1 (d). The tensile strength, the compressive strength, and the bending strength are large as compared with the normal concrete without the steel material 2.

Therefore, the beam 1 made of PC shown in FIGS. 1A and 1B has a larger distance between fulcrums than the beam 1'made of ordinary concrete shown in FIGS. 1C and 1D. can do.

Further, as described above, FIG. 1 (a) (b)
Beam 1 formed by PC shown in FIG. 1 and FIGS. 1 (c) and 1 (d).
Since the tensile strength, compressive strength, and bending strength are the same as those of the beam 1'formed from ordinary concrete shown in Fig. 1,
The beam 1 formed by the PC shown in FIGS.
The beam diameter is smaller (D <D ') than the beam 1'formed by the normal concrete shown in (c) and (d), and the weight and the size are reduced.

Thus, by prestressing the concrete to increase the tensile strength, compressive strength and bending strength of the concrete, it is possible to reduce the weight and size of the member formed of the concrete.

Here, the use example of the fixing material A for PC steel according to the present invention will be described in more detail with reference to the enlarged view of I in FIG. 1 (a) and the enlarged view of II in FIG. 1 (b). .

FIG. 2 shows a fixing material A for PC steel according to the present invention.
2A and 2B are enlarged views showing an example of use, wherein FIG. 1A is an enlarged cross-sectional view of I, and FIG. 2B is an enlarged cross-sectional view of II.

This example of use is an example of use of the fixing material A for PC steel when the PC member is manufactured by the pre-tension system, and as shown in the figure, the PC steel bar 2a as the PC steel 2 is used.
The fixing material A for PC steel is carried on.

That is, in the use example shown in FIG. 2, by applying the fixing material A for PC steel material to the PC steel rod 2a,
The steel rod 2a carries the fixing material A for PC steel, and thereafter, pressure is applied to the PC steel rod 2a from both ends to apply a tensile force to the PC steel rod 2a, and the PC steel rod 2a is placed in the formwork. Once the concrete is hardened and it reaches a sufficient strength, the tensile force of the PC steel rod 2a is loosened and the PC steel rod is placed.
2a is fixed to the surrounding concrete to prestress the concrete.

Particularly, since the fixing material A for PC steel has a high followability even after hardening, the tensile force of the PC steel rod 2a can be transmitted to the concrete, and the concrete can be surely prestressed. .

Further, since the fixing material A for PC steel of the present invention has high adhesiveness, anticorrosiveness and durability, the PC steel rod 2a can be firmly fixed to the concrete, and the PC steel rod 2a can be protected from infiltration water. Can be protected to prevent corrosion,
The tensile strength, compressive strength and bending strength of concrete can be maintained for a long period of time.

FIG. 3 shows a fixing material A for PC steel according to the present invention.
It is an enlarged view showing another example of use, (a) is a sectional enlarged view in I, and (b) is a sectional enlarged view in II.

This example of use is an example of use of the fixing material A for PC steel when a PC member is manufactured by the post-tension system, and as shown in the figure, the PC steel material is provided inside the sheath tube 3 as a protective tube. The PC steel wire 2b as 2 carries the fixing material A for PC steel.

That is, in the use example shown in FIG. 3, the fixing material A for PC steel material is injected and filled between the sheath tube 3 and the PC steel wire 2b arranged inside the sheath tube 3,
The PC steel wire 2b carries the fixing material A for PC steel material and the PC steel wire 2b is fixed to the sheath tube 3. The sheath tube 3 is arranged in the mold and concrete is poured in the mold. Then, after the concrete is hardened, pressure is applied to the PC steel wire 2b inside the sheath tube 3 from both ends to tension the PC steel wire 2b, and the PC steel wire 2b in such a tensioned state is fixed by a fixing tool to the concrete. You are prestressing.

Also in this example of use, the tensile force of the PC steel wire 2b can be surely transmitted to the concrete through the sheath tube 3 by the action of the PC steel anchoring material A having high followability, and thus the You can certainly prestress.

Moreover, since the inside of the sheath tube 3 is filled with the fixing material A for PC steel material, only the fixing material A for PC steel material is interposed between the PC steel wire 2b and the sheath tube 3,
The layer of the PC steel fixing material A covering the PC steel wire 2b is thick. Therefore, not only can the PC steel wire 2b be firmly fixed to the sheath tube 3, but also the corrosion of the PC steel wire 2b inside the sheath tube 3 can be prevented more reliably, and the tensile strength and compression of concrete can be further improved. The strength and bending strength can be maintained for a longer period of time.

FIG. 4 shows a fixing material A for PC steel according to the present invention.
It is an enlarged view showing another example of use, (a) is a sectional enlarged view in I, and (b) is a sectional enlarged view in II.

This example of use is another example of use of the fixing material A for PC steel when a PC member is manufactured by the post-tension system. Similar to the example of use shown in FIG. 3, the sheath tube 3 is used.
The fixing material A for PC steel is carried on the PC steel wire 2b disposed inside the.

However, in this example of use, unlike the example of use shown in FIG. 3, the fixing material A for PC steel is the PC steel wire 2b.
The fixing material A for PC steel material is carried on the same PC steel wire 2b by applying it to the inside, and the PC steel wire 2b carrying the fixing material A for PC steel material is placed inside the sheath tube 3 filled with mortar 4. By installing it, the PC steel wire 2b is fixed to the mortar 4 inside the sheath tube 3.

Then, the sheath tube 3 in which the PC steel wire 2b is arranged is arranged in the mold, concrete is poured in the mold, and after hardening of the concrete, the PC steel in the sheath tube 3 is filled. The PC steel wire 2b is tensioned by applying pressure to the wire 2b from both ends, and the PC steel wire 2b in the tensioned state is fixed by a fixing tool to prestress the concrete.

Also in this example of use, the tensile force of the PC steel wire 2b can be reliably transmitted to the concrete through the mortar 4 and the sheath tube 3 by the action of the PC steel fixing material A having a high followability. The concrete can be surely prestressed.

Moreover, since the fixing material A for PC steel has high adhesiveness, rust prevention and durability as described above, the PC steel wire 2b
Can be reliably fixed to the mortar 4 filled inside the sheath tube 3, corrosion of the PC steel wire 2b inside the sheath tube 3 can be prevented, and the tensile strength and compressive strength of concrete Bending strength can be maintained for a long time.

Although omitted in the description of Examples 1 to 3, the weight ratio of the composite polymer emulsion constituting the fixing material for PC steel material to the main material is (composite polymer emulsion) :( main material) = It is desirable that the ratio is 1: 3 to 4, and within such a range, the diameter dimension of the protective pipe or the PC steel material, the material of the protective pipe or the PC steel material, the gap dimension between the protective tube and the PC steel material, and the fixing material for the PC steel material The weight ratio may be appropriately determined according to various settings (injection rate, injection pressure, etc.) at the time of injection.

As the PC steel material coated with the fixing material for the present PC steel material, various PC steel materials may be used in addition to the PC steel rod 2a and the PC steel wire 2b described in the above-mentioned use example, and the post tension In the system, as the protective tube filled with the fixing material A for the present PC steel material, various protective tubes may be used in addition to the sheath tube 3 described in the above usage example.

[0072]

The invention is carried out in the above-mentioned form, and has the following effects.

(1) In the present invention as set forth in claim 1, when a prestressed concrete is manufactured, a PC steel is supported on the PC steel to fix the PC steel to the concrete.
A fixing material for steel materials, wherein the fixing material for PC steel materials is a mixture of a composite polymer emulsion containing an acrylic ester copolymer as a main component and a main material containing silicon oxide, calcium oxide and iron oxide as main components. Since it is generated, the tensile force of the PC steel material can be transmitted to the concrete, and the concrete can be reliably prestressed. In particular, this fixing material for PC steel has high adhesion, rust prevention and durability, so P
The C steel material can be reliably fixed to the concrete, the PC steel material can be protected from infiltration water to prevent corrosion, and the tensile strength of the concrete member can be maintained for a long period of time.

(2) According to the second aspect of the present invention, when manufacturing prestressed concrete, a PC steel material is fixed on the protective steel by supporting it on the PC steel material arranged in the protective tube. The fixing material for PC steel is a composite polymer emulsion containing an acrylic acid ester copolymer as a main component, silicon oxide, calcium oxide,
Since it was generated by mixing with the main material whose main component is iron oxide,
By interposing only the fixing material for PC steel material according to the present invention between the PC steel material and the protection tube, the tensile force of the PC steel material can be surely transmitted to the concrete through the protection tube, and more reliably to the concrete. Can be prestressed. Moreover, since the layer of the PC steel fixing material to be carried on the PC steel material can be thickened, the adhesion, rust prevention and durability of the PC steel fixing material can be sufficiently exerted on the PC steel material,
It is possible to securely fix the PC steel material to the protective tube, more reliably prevent the corrosion of the PC steel material in the protective tube, and further to maintain the tensile strength of concrete for a longer period of time. .

(3) According to the present invention as set forth in claim 3, when the prestressed concrete is manufactured, it is carried on the PC steel material arranged in the protective pipe so that the PC steel material is fixed to the mortar filled in the protective pipe. A fixing material for a PC steel material, which comprises a composite polymer emulsion containing an acrylic ester copolymer as a main component and a main material containing silicon oxide, calcium oxide and iron oxide as main components. Since it is generated by mixing, the tensile force of the PC steel material can be transmitted to the concrete through the protective pipe and the mortar filled in the protective pipe, and the concrete can be reliably prestressed. In particular, since the fixing material for the present PC steel material has high adhesiveness, rust prevention and durability, it is possible to reliably fix the PC steel material to the mortar filled in the protective tube, and
The C steel material can be protected from infiltration water to prevent corrosion, and the tensile strength of concrete can be maintained for a long period of time.

[Brief description of drawings]

FIG. 1 is a diagram illustrating the structure of a PC, in which (a) is a PC.
It is explanatory drawing by the side view of the beam formed by (b).
Is a cross-sectional explanatory view from the same front view, (c) is an explanatory view from a side view of a beam formed of normal concrete, and (d) is a cross-sectional explanatory view from the same front view.

FIG. 2 is an enlarged view showing an example of use of a fixing material for PC steel according to the present invention, in which (a) is an enlarged cross-sectional view of I and (b) is an enlarged cross-sectional view of II.

3A and 3B are enlarged views showing another example of use of the fixing material for PC steel according to the present invention, in which FIG. 3A is an enlarged sectional view of I and FIG. 3B is an enlarged sectional view of II.

FIG. 4 is an enlarged view showing another example of use of the fixing material for PC steel according to the present invention, in which (a) is an enlarged cross-sectional view of I and (b) is an enlarged cross-sectional view of II.

[Explanation of symbols]

A PC Fixing material for steel Thickness of beam formed by DPC member D'Thickness of beam formed by normal concrete member 1 beam 1'beam 2 PC steel 2a PC steel rod 2b PC steel wire 3 sheath tube 4 mortar

Claims (3)

[Claims] 1. A fixing material for a PC steel material, which is carried on a PC steel material to fix the PC steel material to concrete when manufacturing prestressed concrete, wherein the fixing material for the PC steel material is an acrylic ester A composite polymer emulsion containing a polymer as a main component, silicon oxide,
A fixing material for PC steel, which is produced by mixing calcium oxide and a main material containing iron oxide as a main component. 2. When manufacturing prestressed concrete, it is supported on a PC steel material arranged in a protective pipe and the same PC is used.
A fixing material for a PC steel material for fixing a steel material to a protective tube, the fixing material for a PC steel material comprising: a composite polymer emulsion containing an acrylic acid ester copolymer as a main component;
A fixing material for PC steel, which is produced by mixing calcium oxide and a main material containing iron oxide as a main component. 3. When manufacturing prestressed concrete, it is supported on a PC steel material disposed in a protective pipe and the same PC is used.
A fixing material for a PC steel material for fixing a steel material to a mortar filled in a protective tube, the fixing material for a PC steel material comprising: a composite polymer emulsion containing an acrylic ester copolymer as a main component;
A fixing material for PC steel, which is produced by mixing calcium oxide and a main material containing iron oxide as a main component.