JP2766535B2 - Reinforcement - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention is intended to be embedded in a structural material having a low tensile strength, such as a hydraulic hardened product, a plastic product, etc.
The present invention relates to a reinforcing material used to enhance bending strength.

<Prior art> Conventionally, for this use, reinforcing bars and PC tendons are known.
There are problems such as lack of durability of strength due to rust, expansion cracks due to rust, large specific gravity and heavy weight, and low electric insulation and high magnetic permeability depending on other uses. In order to solve these problems, a method has been devised in which organic fibers and inorganic fibers having high electrical insulation properties, a magnetic permeability close to 1 and low specific gravity without rusting are formed into a fiber aggregate and formed into a bar by resin bonding. I have.

<Problems to be Solved by the Invention> However, Kevlar fiber, which is an organic fiber, has high strength, but has poor alkali resistance and has a problem in durability.
Glass fibers and carbon fibers, which are inorganic fibers, also have high strength, but their elongation is low and the fibers are cut at the time of manufacturing a bar, resulting in poor workability, and it is very difficult to arrange reinforcing bars. In addition, glass fibers have problems such as low alkali resistance, and carbon fibers are expensive. Further, even when polyvinyl alcohol fibers or aramid technolas fibers are relatively well-balanced in terms of characteristics, when used in combination with a low-grade thermosetting resin, a sufficient efficiency utilization rate cannot be obtained with the rod material. Generally, the elongation of this kind of resin is low, and the most popular unsaturated polyester resin, phenol resin and epoxy resin are 2.5%.
It is about 4.5%. As described above, none of the requirements for structural reinforcing materials such as high strength, high Young's modulus, alkali resistance, handleability, adhesion to cement matrix, etc. are satisfactory, and high strength fibers are used. At present, there is no rod that makes full use of its performance. Accordingly, the present inventors have studied the structural reinforcing material without such inconvenience as a result of intensive studies, and have made it possible to provide a high-performance structural reinforcing material sufficiently utilizing fiber physical properties.
The present invention relates to a rod-shaped reinforcing material in which high-strength, high-modulus, and high-elongation organic fibers are arranged substantially in the axial direction, and the fibers are bound to each other with a resin of 10 to 100% by weight. An object of the present invention is to provide a reinforcing material having a degree in the range of 1.2 times or more, preferably 1.7 to 7 times, the fiber elongation.

<Means for Solving the Problems> The fiber used in the present invention needs to have a tensile strength of 14 g / dr or more, a Young's modulus of 300 g / dr or more, and an elongation of 4% or more. If it is lower than that, a bar having both sufficient strength and workability cannot be obtained, and various concrete reinforcements are not necessary. The relationship between the fiber and the resin is the most important factor for expressing the cooperative utilization rate of the fiber in the bar. In other words, in order to maximize the strength of the organic fiber having an elongation of 4% required for the workability of the rod by the tensile behavior in the axial direction, the elongation of the matrix resin should be 1.2% of the fiber elongation. The elongation of the resin must be at least 1.7 times, preferably 1.7 to 7 times, and the elongation of the resin is at least 5%, more preferably 4%.
% Or more is used. However, in general, the resin elongation of this type of resin (for example, glass fiber-epoxy resin) is 4.5% or less. In the case of these low elongation resins, the bar is not subjected to the tensile load. In this case, cracks occur in the resin portion first, or the fibers start to spread, and the strength of the fibers cannot be used well. Among the fibers, high-strength vinylon and technola fibers are preferred. In other words, there is no problem caused by metallic materials in terms of rusting, durability, electromagnetic properties, and lightness. Kevlar (low elongation aramid fiber), carbon,
There is no problem of alkali resistance and workability unlike glass fiber. Here, as the type of the binder, the epoxy resin is the best in terms of application within the range having the above-described relationship with the fiber elongation, but the following may be used. That is, a thermosetting resin such as a vinyl ester resin or a polyester resin, or a thermoplastic resin such as vinyl chloride, vinylidene chloride, or polypropylene can be used. The amount of resin to fiber should be in the range of 10-100% by weight. Ten%
If it is lower, the binding between the fibers is too weak, so that the integrity of the resin fibers as a rod material is reduced and the utilization rate of strength is reduced. 10
Even if it is higher than 0%, the degree of freedom of the fiber is hindered by the resin,
In addition, the linearity of the fiber is impaired, and as a result, the power utilization rate decreases. The pultruding method is the most appropriate for the method of forming the rod material, but it is also possible to form the thread into a braid or a rope and then to impregnate the resin.

<Effect of the Invention> The bar produced as described above sufficiently exhibits the performance of the fiber, and has good alkali resistance and large reinforcement hardening,
In addition, since the rod is lightweight, has good electrical insulation, small magnetic permeability, does not rust, has high alkali resistance, and has a large reinforcing effect, it is used for lightweight concrete, ordinary concrete and concrete members with salt damage, It is very effective as a reinforcement for linear motor car mounts.

Next, examples of the strength utilization rate and the reinforcing effect of the fiber of the manufactured rod material will be described.

Example Using polyvinyl alcohol fiber having a yarn denier of 1800dr / 1000f, the total number of single fibers was collected to 241200dr, and 828-70 parts by weight of Yuka Ciel Epoxy Co., Ltd. as an epoxy resin (1), diluent YED205- Impregnated with a mixture of 30 parts by weight and 30 parts by weight of curing agent LX-1N
The material was cured under tension at 80 ° C. for 3 hours to produce a bar having a diameter of 6 mm. The ratio of resin to fiber in the rod was 30% by weight. And around the bar material, the same polyvinyl colul fiber and Arn denier is 5400dr / 3
000f, impregnated with the same resin, was spirally wound with a 5 mm pitch to form a deformed rod. In the same manner, other reinforcing fibers include Technora (manufactured by Teijin Limited).
1500dr / 1000f), Kevlar 49 (1500dr / 100 manufactured by DuPont)
0f), glass fiber (RS110-QL16μφ manufactured by Nitto Bo), carbon fiber (Toray Carbon T-300B6000-5000 7μ)
is approximately the same as the total denier, and the other resin used is a mixture of epoxy resin (2) (Yuka Kasei Epoxy Co., Ltd., Epicoat 828-100 parts by weight, curing agent LX-1N 30 parts by weight (curing condition: 80 ° C.) 3 hours), Epoxy resin (3) (Yuika Ciel Epoxy, Epicoat 828-100 parts by weight, Epomate B002-50 parts by weight (curing conditions: 100 ° C for 2 hours), vinyl ester (1) (Showa Kogyo EPOLATK RT
933-100 parts by weight, curing catalyst permek N-7.5 parts by weight,
0.5 parts by weight of a curing accelerator, cobalt N (curing conditions: 80 ° C., 2 hours), vinyl ester (2) (Epolac R8 manufactured by Showa Kogyo KK)
02-100 parts by weight, curing catalyst permek N-7.5 parts by weight, curing accelerator cobalt N-0.5 parts by weight (curing conditions: 80 ° C. for 2 hours) 7 was used in combination. Table 1 shows the results.

The fiber strength elongation was measured by a Shimadzu Autograph at a test length of 10 cm and a pulling speed of 2 cm / min in accordance with JIS-L-1013 “Chemical Fiber Filament Measurement Method”. In addition, resin elongation was measured using a No. 1 type test piece of the JIS-K-7113 plastic tensile test method, a sample was prepared by machining from a plate, and a thickness of 2 mm was measured using a Shimadzu autograph with a thickness of 10 mm. Measured at a rate of / min. The strength utilization rate of the bar was measured by using a Shimadzu autograph with a test length of 50 cm and a tensile speed of 20 mm / min.The strength was divided by the value obtained by using the fiber strength measurement method described above and the total denier value. Values were used. Alkali resistance is PH = 12.5
The external appearance of the rod after the addition to the cement extract at 80 ° C. for 2 years was visually judged. The workability was determined by visually observing the cracks and buckling of the R portion at a right angle after leaving the bar in a thermostat at 180 ° C. for 2 hours.

Continuation of front page (58) Field surveyed (Int.Cl. ⁶ , DB name) E04C 5/00-5/20

Claims (1)

(57) [Claims] An organic fiber having a tensile strength of at least 14 g / dr, an elongation of at least 4%, and a Young's modulus of at least 300 g / dr is arranged in the axial direction, and the fibers are bonded with a resin of 10 to 100% by weight based on the fiber. A reinforcing material characterized by having a resin elongation of 1.2 times or more as compared with a fiber elongation in the rod-shaped reinforcing material attached.