JPS62260947A - Reinforcing bar comprising full-aromatic polyamide fiber - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to reinforcing bars that can be used at the foot of a slope in the fields of architecture and civil engineering.

(b) Prior Art Conventionally, concrete structures used in the construction of bridges, dams, various high-rise buildings, etc. have been constructed using reinforced concrete structures with reinforcing reinforcing bars buried inside, or not only reinforcing reinforcing bars but also reinforcing steel frames are buried inside. Steel-frame reinforced concrete construction (so-called
SRC construction).

These reinforcing reinforcing bars or reinforcing steel frames are buried in concrete in view of the fact that concrete is weak against tensile force.

(C) Problems to be Solved by the Invention However, in the above-mentioned reinforced concrete construction or steel-frame reinforced concrete construction, the specific gravity of the reinforcing bars is large, so the construction and burying work is labor intensive, and due to changes in the properties of concrete over time, There was also the problem of corrosion of reinforcing reinforcing bars and steel frames.

In order to prevent such corrosion, some paints are used after painting the surface of reinforcing reinforcing bars and steel frames in advance, but conventional paints do not have good adhesion to concrete, and the weight of reinforcing bars increases. This made construction and burial work even more difficult.

An object of the present invention is to provide a reinforcing bar made of wholly aromatic polyamide fiber that can solve the problems of the prior art.

(d) Means for solving the problems The present invention forms a rod-shaped core material from wholly aromatic polyamide fibers, and at least the surface of the core material is a composite material mainly composed of carboxy-modified styrene and cyclohexyl methacrylate. This invention relates to reinforcing bars made of wholly aromatic polyamide fibers, characterized in that a concrete adhesive layer is formed by mixing a polymer emulsion with a main ingredient mainly composed of silicon oxide, calcium oxide, and iron oxide.

(E) Actions and Effects ■ Since a rod-shaped core material made of fully aromatic polyamide fiber with light specific gravity is used as the reinforcing bar, handling of the reinforcing bar, i.e.
The construction and burying work can be done easily and quickly.

■The rod-shaped core material made of wholly aromatic polyamide fibers has a concrete adhesive layer on its surface that has high adhesive strength to concrete, etc., so it can strongly integrate the wholly aromatic polyamide fibers and concrete. The high tensile strength of fully aromatic polyamide fibers and the high compressive strength of concrete work together to resist earthquake forces, ensuring that concrete structures such as buildings are not damaged. It can be prevented.

■In addition, reinforcing bars made of wholly aromatic polyamide fibers do not deteriorate in properties or strength even if the properties of the concrete change over time, making it possible to extend the life of concrete structures. can.

(f) Examples The present invention will now be explained in detail based on examples shown in the accompanying drawings.

Figures 1 and 2 show the cross-sectional structure of the reinforcing bar according to the present invention. In the figures, 1 is a rod-shaped core material, and 2 is a concrete adhesive layer formed on the outer surface of the core material 1. be.

The present invention essentially provides that the core material 1 is formed of a rod-shaped body made of wholly aromatic polyamide fiber (aramid), and that at least the surface of the core material 1 is mainly composed of carboxy-modified styrene and cyclohexyl methacrylate. It is characterized in that the concrete adhesive layer 6 is formed by mixing a composite polymer emulsion as a component with a main agent mainly composed of silicon oxide, calcium oxide, and iron oxide.

Here, the wholly aromatic polyamide fiber refers to a polyamide fiber having high tensile strength, high heat resistance strength, and high bending resistance, and commercially available fibers can be used.

Further, the composite polymer emulsion refers to, for example, those disclosed in Japanese Patent Application No. 57-33499 and Japanese Patent Application No. 59-92112, and such a composite polymer emulsion has, for example, the following component composition.

Carboxy modified styrene butadiene 45% cyclohexyl methacrylate 24% methanol
5% fatty acid soda soap
1% water
25% Furthermore, the base agent may have the following composition.

White cement 28.0% Silica sand (S i 02 ) 71.6% Iron powder (F 6304 ) 0.2% Zinc white (ZnO) 0.1% Titanium white (TiO2) 0.1% Note that the above concrete adhesive layer It is preferable that the ratio of the main agent forming 2 to the composite polymer emulsion is 3 to 5:1.

In addition, various forms can be considered as a method of forming the concrete adhesive layer 2 on the core material 1.
As shown in the figure.

That is, as shown in Fig. 3, a plurality of core materials 1 are stretched under tension inside the box 3, and then a slurry for forming a concrete adhesive layer consisting of a composite polyemulsion and a base material is poured into the box 3, so-called dobukke. It can be formed by doing the following.

In this case, by impregnating the composite polymer emulsion not only on the outer surface of the core material 1 but also on the inside thereof as shown in FIG. 2, it is possible to achieve an adhesion effect between the wholly aromatic polyamide fibers. It can have a certain degree of hardness.

Furthermore, the adhesive layer 2 made of the composite polymer emulsion and the main material has excellent physical and chemical properties, and can provide the following effects.

■The core material 1 made of fully aromatic polyamide fibers with high tensile strength is bonded to concrete by the concrete adhesive layer 2 made of a composite polymer emulsion with substantially strong adhesion and a base material or cement. The two can be strongly integrated and can work together to resist earthquake forces, etc., and can reliably prevent damage to concrete structures such as buildings.

■In addition, both the core material 1 and the concrete adhesive layer 2 do not change their chemical and physical properties even if the properties of the concrete body change over time, so it is possible to extend the life of the concrete structure. .

■Also, since the core material is made of fully aromatic polyamide fiber with a light specific gravity, construction and embedding of reinforcing bars can be done easily and quickly.

It is preferable to set it to 1.

FIG. 4 shows a case where the present invention is applied to a concrete structure 10 made of reinforced concrete.

In the figure, the concrete structure 11 is shown as a beam having a rectangular cross section, and the concrete body 12 (P
It is constructed by burying a plurality of reinforcing bars 13 above and below the concrete (including C concrete).

Moreover, FIG. 5 shows a case where the present invention is applied to a concrete structure 11 made of SRC.

In the same figure, the concrete structure 11 is shown as a beam having a rectangular cross section, and a reinforcing bar 14 made of H-beam steel is buried in the center of the concrete body 12, and a plurality of reinforcing bars 15 are buried on both sides of the reinforcing bar 14. It is made up of.

In the above configuration, the reinforcing bars 13, 14, and 15 have the configuration according to the present invention, and are made of a composite polymer emulsion and a base material or cement on the entire circumferential surface of the core material 1 made of wholly aromatic polyamide fibers. It is manufactured by forming a concrete adhesive layer 2.

[Brief explanation of drawings]

Fig. 1 is a front view of the reinforcement according to the present invention, Fig. 2 is a cross-sectional view thereof, Fig. 3 is an explanatory diagram of the method of forming a concrete adhesive layer, and Fig. 4 is a sectional view of a concrete structure made of reinforced concrete. , Figure 5 is a cross-sectional view of a concrete structure made of SRC. In the figure, l: Core material 2; Concrete adhesive layer 13: Reinforcement bar 14: Reinforcement bar 15: Reinforcement bar Patent applicant Yoshiyuki Ohkushi Agent Ken Matsuo Pilgrimage letter (spontaneous) July 7, 1985 1, Indication of the case 1988 Patent Application No. 104030 2, Name of the invention Reinforcement bars made of wholly aromatic polyamide fibers 3, Person making the amendment Related Patent applicant name Yoshino Okushi 4, agent address 1st floor, Reisen Corporas, 2-4-26 Imaizumi, Chuo-ku, Fukuoka 810 4092-714-00906,
Specification Subject to Amendment 7, Contents of Amendment ■ In the second line of page 8 of the Specification Section, "Shida no no" is corrected to "Shitano de". ■Page 8, line 4 [It is preferable to set it to 1. ” will be deleted.

Claims (1)

[Claims] 1. A rod-shaped core material is formed from wholly aromatic polyamide fibers, and at least on the surface of the core material, a composite polymer emulsion containing carboxy-modified styrene, cyclohexyl methacrylate as main components is applied to silicon oxide, calcium oxide,
A reinforcing bar made of wholly aromatic polyamide fibers, which is characterized by forming a concrete adhesive layer formed by mixing it with a base material mainly composed of iron oxide.