JPH0781992A - Concrete products using glass-reinforced thermosetting resin as reinforcing material and production thereof - Google Patents

Abstract

PURPOSE:To improve the characteristics of various kinds of concrete products and promote the effective discarding disposal of ERP by using the crushed matter of glass-reinforced thermosetting resin (ERP) as a reinforcing material. CONSTITUTION:The FRP crushed matter is made to the filament having the size of order of passing a 5mm sieve or under beated to crush and open the filament to a short fiber. These are incorporated and kneaded to a mortar or a concrete by 5-30% as the reinforcing material and formed and solidified to the concrete products. In this way, bulk density, bending strength and compression strength are improved. Strength is improved, heat conductivity is reduced in accordance with the increase of a mixing ratio and heat insulating effect is improved in the case of the mortar, etc., added with a light weight aggregate. Moreover, when the FRP crushed matter which is made into the filament is mixed to the mortar, etc., added with an inorg. powder, the bulk density, the bending strength, the rate of change of length and the heat conductivity are improved, and final fracture strength and toughness are improved even when used as the rein forcing material by sandwiching the FRP plate between the layers of the mortar, etc.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mixes glass fiber reinforced thermosetting resin (hereinafter abbreviated as FRP) into a mortar or concrete as a reinforcing material and molds and solidifies it to obtain tensile strength and resistance to various concrete products. The present invention relates to a concrete product which is improved in various properties such as impact resistance and toughness and promotes effective disposal of FRP, and a manufacturing method thereof.

[0002]

2. Description of the Related Art FRP is a material in which glass fiber is added as a reinforcing material to a thermosetting resin as a main material and is used as various industrial materials because of its light weight, excellent corrosion resistance and moldability. Besides, it is widely used for hulls, bathtubs and other consumer products.

Although various products using such FRP must be treated as wastes after the end of their useful life, most of the methods of treating these wastes are incineration or landfill. Is.

On the other hand, conventionally, there has been known a composite material in which short fibers made of a metal or a synthetic resin are uniformly dispersed in mortar or concrete to improve tensile strength, impact resistance and toughness. A typical example is steel fiber reinforced concrete. In this case, short fibers having a diameter of 0.3 to 0.9 mm and a length of about 25 to 60 mm are used, and dispersion into concrete is mainly performed by mixing with a mixer.

Further, concrete in which synthetic fibers such as polyethylene and polypropylene are mixed as a synthetic resin has been put into practical use. The fiber mixing ratio in these fiber reinforced concretes is about 1 to 2% by volume.

[0006]

However, the above-mentioned F
The incineration means of RP waste is likely to become a pollution source by generating a large amount of smoke and carbon dioxide gas, and the other landfill means is currently in the problem of securing a landfill site. Especially FR
Due to the peculiar toughness and corrosion resistance of P, it is difficult to treat it like other wastes, and problems such as illegal disposal have occurred.

Further, the means for uniformly dispersing the short fibers made of metal or synthetic resin in the concrete requires a special mixer, and it is difficult to uniformly mix and the cost becomes high. There's a problem. Further, some attempts have been made to mix FRP in the form of fine powder into concrete instead of the above metal or synthetic resin. In this case, it is possible to reduce the weight, but generally the amount of FRP fine powder added is There is a problem that the strength of concrete decreases as the amount increases.

Therefore, if the FRP waste can be reused as a reinforcing material for increasing the strength of concrete, it is considered desirable not only from the viewpoint of FRP waste treatment but also from the viewpoint of effective use of resources.
In view of the above, it is an object of the present invention to provide a concrete product in which FRP waste is crushed and the crushed product is used as a reinforcing material, and a method for producing the same.

[0009]

In order to achieve the above object, the present invention provides a concrete product using FRP as a reinforcing material, wherein crushed material of FRP is used as a reinforcing material mixed in mortar or concrete, The composition of the crushed material in a fibrous shape, the composition of the crushed material in a fibrous shape that passes through a 5 mm sieve, the composition of further crushing the crushed material into crushed and fibrillated single fibers, and the mixing ratio thereof 5 to 30% is provided.

Further, as a manufacturing method, the fibrous crushed material of FRP is kneaded with mortar or concrete, and then molded and solidified. After the fibrous crushed material is kneaded and pressure dehydrated,
Molded and solidified structure, structure in which the fibrous crushed material is further beaten to crush and disintegrate into single fibers, structure in which lightweight aggregate is mixed in mortar or concrete, and inorganic powder is mixed in mortar or concrete And a configuration in which mortar or concrete is packed into a mold in a plurality of layers, and a plate-shaped FRP is sandwiched between the layers to be solidified.

[0011]

According to the present invention having the above-mentioned constitution, when the crushed material of FRP is crushed and defibrated into single fibers and mixed with ordinary cement and mortar, the bulk specific gravity, bending strength and compressive strength are increased. In particular, the bending strength increases as the mixing ratio of the crushed material increases. In addition, when mixed with mortar or concrete containing lightweight aggregate, the strength is increased as compared with the case of ordinary mortar, and especially the bending strength in the case of adding lightweight aggregate is 2 to 4 times that of normal mortar. Doubled. In addition, the thermal conductivity also decreases as the mixing ratio of the fibrous crushed material of FRP increases, and the heat insulating effect is enhanced.

Further, the crushed product of fibrous FRP is mixed with mortar or concrete to which inorganic powder is added, and the bulk specific gravity, bending strength, length change rate and thermal conductivity are increased, and mortar or concrete Even when an FRP plate is sandwiched between layers and used as a reinforcing material, the final breaking strength is large and the toughness is remarkably improved.

[0013]

EXAMPLES Concrete examples of concrete products using FRP as a reinforcing material and a method for producing the same according to the present invention will be described below.

As a result of earnest studies on the technical means for effective utilization of FRP waste, the present inventor improved the bending strength of concrete by using the crushed material of FRP as a reinforcing material for concrete, This was made based on the finding that the weight can be reduced and the thermal conductivity can be reduced.

In general, when a crushed product of FRP is mixed with cement / concrete, an alkali silicate gel is produced by the reaction between glass fiber and alkali in the cement, and further swelling by water absorption causes the expansion pressure to reduce the durability of concrete. Because of concern, first of all, as a preliminary experiment, FR
Regarding alkali-silica reactivity of P crushed product, JIS.
A. 5308. It was examined based on Appendix 7 (Chemical method) and Appendix 8 (Mortar bar method).

As a result of the chemical method, the alkali consumption of the FRP crushed product became larger than the value of the glass fiber alone, because the alkali was consumed for the hydrolysis of the polyester resin. It was found that since the surface is covered, the elution of silica is suppressed and the amount of dissolved silica is reduced. In addition, the result of the mortar bar method is that the expansion coefficient after 6 months is 0.051% even in the case of the composition in which the total volume of the volume occupied by the fine aggregate is replaced with the FRP crushed product in the prescribed cement and fine aggregate composition. (Judgment criteria: 0.1% or less), and all were found to be harmless.

Further, when the microstructure was analyzed and evaluated by observing the fracture surface by an electron microscope, only the holes which were considered to have been formed by the FRP extraction were observed, and the concerned FR was concerned.
No formation of sodium silicate or the like was observed around the P crushed material.

Therefore, as a concrete product using the FRP as a reinforcing material and a method for producing the same according to the present invention, first, as a pretreatment, a crushed material obtained by crushing the FRP into fibrous materials that pass through a 5 mm sieve is beaten with a beater. , The resin part and 2
A crushed and disentangled single fiber of 3 mm or less was prepared.
In many cases, the specimen (4 × 4 × 16 cm) was formed by a vibration forming means, and the initial curing was performed by heating at 40 ° C. × 100% RH. Further, the mixing amount of the FRP fiber was set to 5 to 50% of the cement weight. Various specific examples will be described below.

Example 1 Cement 500 as a material
g, Toyoura standard sand 1000 g, water 300 g, and FRP fibrous crushed material (5 to 30% of cement) are prepared.
IS. R. It was kneaded and molded by a kneader according to 5201. Curing is 20 ° C x RH100%, 20 hours for 4 hours after molding
Time is 40 ° C × RH 100%, 12 days is 20 ° C × RH
The sample was dried at 100% and then at 40 ° C. for 24 hours and subjected to the test. The mixing amount of FRP and the physical properties of the mortar specimen thus obtained are shown in Table 1.

[0020]

[Table 1]

[Example 2] Cement 500 as a material
g, Toyoura standard sand 1000 g, water 300 g, FRP fibrous crushed material (10 to 50% with respect to cement), and 10 cc of water-reducing dispersant were kneaded in a kneading machine in the same manner as in Example 1 to obtain and cure. Table 2 shows the FRP mixing amount and physical properties of the mortar specimens.

[0022]

[Table 2]

[Embodiment 3] Cement 500 as a material
g, 190 g of pearlite as a lightweight aggregate, 300 g of water and FRP crushed material (10 to 30% with respect to cement) were kneaded and molded by a kneading machine in the same manner as in Example 1, and cured to obtain a mortar specimen. Table 3 shows the mixing amount and physical properties of FRP.

[0024]

[Table 3]

[Example 4] Cement as a material, serpentine powder as an inorganic powder, and FRP fibrous crushed material were dispersed in water and dehydrated and molded, and this was subjected to 6 at 20 ° C x 100% RH.
It was aged and then dried at 40 ° C. to obtain a plate-shaped product. Table 4 shows the mixing ratio of each material and the physical properties of the obtained plate-shaped product. The workability of cutting these plate-shaped products with a saw and nailing was good.

[0026]

[Table 4]

[Embodiment 5] JIS. A. According to 5402, mortar of cement: fine aggregate = 1: 2 is mixed with FRP fibrous crushed material, and pressure dehydration molding is performed by a hydraulic machine. Initial curing at 300 ° C. and secondary curing at 2500 ° C. A thick slate (Japanese type 49) was obtained. Table 5 shows the mixing amount of FRP and the physical properties of the obtained thick slate.

[0028]

[Table 5]

Example 6 350 g of cement, 700 g of Toyoura standard sand, 116 g of water and 7 cc of a water reducing dispersant were kneaded in a kneader in the same manner as in Example 1 and then the form (8 × 18 × 4.
5cm) divided into 2 layers and packed into the center, φ1
FRP plate with a 0 mm hole (6 x 16 x 0.5 cm)
And sandwiched between them to perform vibration pressure molding. The curing was performed under the same conditions as in Example 1. Table 6 shows the area and physical properties of the holes formed in the FRP plate of the obtained specimen.

[0030]

[Table 6]

From the results of the above examples, when the crushed FRP was mixed with ordinary mortar as shown in Example 1, the bulk specific gravity was about 1.8 to 2.1 g / cm ³ , and the bending strength was high. Approximately 40-78 kg / cm ² , compressive strength is 310-41
A value of 1 kg / cm ² was obtained, and the mixing effect of the FRP crushed product decreased linearly with the increase of the mixing ratio with respect to the bulk specific gravity, and at a mixing ratio of 30% (50 kg / m ³ ) it was about 13%.
It was made lighter. The flexural strength increased as the mixing ratio of the FRP crushed product increased, and doubled at 30% mixing.
The compressive strength tended to decrease as the mixing ratio of the FRP crushed product increased. In addition, as shown in Example 2,
In a workable mortar with a water reducing dispersant, F
A large amount of RP fibrous crushed materials can be mixed, and the weight can be reduced without significantly lowering the strength.

As shown in Example 3, when the FRP fibrous crushed product was mixed with the lightweight mortar using perlite as the lightweight aggregate, the specific gravities of the FRP and the crushed products were about the same. Has a bulk specific gravity of 1.0 to 1.1 g /
cm ³ has little effect, but the strength is more effective than ordinary mortar, and the bending strength is about 13 to 32k.
The g / cm ² was 2 to 4 times, and the compressive strength was slightly increased.

Further, as shown in Example 4, the dehydrated and solidified product comprising cement as a material, serpentine powder as an inorganic powder, and 30 to 50% of each FRP fibrous crushed material has a bulk specific gravity of about 1.1 to. 1.2 g / cm ³ , bending strength is about 45 ~
A product with a weight change of about 69 kg / cm ² , a length change rate of about 0.16 and a thermal conductivity of 0.277 was obtained.

When the thick slate was mixed and used as shown in Example 5, the bending strength could be remarkably improved although the bulk specific gravity and the water absorption were little affected. In addition, Example 6
It is also effective to sandwich a plate-shaped FRP as a reinforcing material as shown in Fig. 7, and the final breaking strength is 1.7 to 2.9 times that of the case without reinforcement (about 81 to 142 kg / cm ² ).
The toughness was remarkably improved.

From the above results, it is possible to reduce the weight and improve the bending strength and the thermal conductivity by mixing the fibrous crushed material of FRP in an amount of about 5 to 30% of the weight of the cement, so that it can be used for various concrete products. It was confirmed that it is possible, and that the plate-shaped product obtained by dehydration molding is a little small in strength, but it can be sufficiently used as a base material for a coating wall.

[0036]

As described in detail above, according to the concrete product using FRP as a reinforcing material and the method for producing the same according to the present invention, smoke and carbon dioxide gas generated in the conventional means of simply incinerating FRP, etc. As a pollution source, the problem of disposal processing based on the unique toughness and corrosion resistance of FRP can be solved without the need to secure a landfill site.

When mixed and used in concrete, the bending strength of the concrete is particularly improved, and
It has the effect of significantly reducing the weight and improving the heat insulation. Further, the cost can be reduced as compared with the case where steel fiber or synthetic resin fiber is used as the reinforcing material.

In the present invention, the conventional method of simply discarding the F
The most important feature is the reuse of RP wastes, which is desirable from the viewpoint of effective use of resources, and also the problem of disposal of FRP wastes, which is a problem in environmental conservation and nature protection. It has a great effect of being able to solve it.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Reference number within the agency FI technical display location // B09B 3/00 ZAB (72) Inventor Hiroshi Uejima 2-3-3 Hananomiyacho, Takamatsu City, Kagawa Prefecture No. 2 Shikoku Institute of Industrial Technology, Institute of Industrial Technology (72) Inventor Takao Kitamura 2-3-3 Hananomiyacho, Takamatsu City, Kagawa Prefecture Inside Shikoku Institute of Industrial Technology, Institute of Industrial Technology (72) Inventor Kazuhide Hamada Kochi, Kochi Prefecture 3942 Fushida 3 Kochi Prefecture Industrial Technology Center (72) Inventor Toshio Kono 3992 Fushida Kochi City, Kochi Prefecture Kochi Prefecture Industrial Technology Center (72) Inventor Masamichi Fujiwara 3992 3 Fushida Kochi City, Kochi Prefecture Kochi Prefecture Industrial Technology Center

Claims (11)

[Claims] 1. A concrete product using a glass fiber reinforced thermosetting resin as a reinforcing material, wherein a crushed material of glass fiber reinforced thermosetting resin is used as a reinforcing material mixed in mortar or concrete. 2. A concrete product using the glass fiber reinforced thermosetting resin as a reinforcing material according to claim 1, wherein a crushed material of the glass fiber reinforced thermosetting resin is in a fibrous form. 3. A concrete product using the glass fiber reinforced thermosetting resin as a reinforcing material according to claim 1, wherein the crushed material of the glass fiber reinforced thermosetting resin is made into a fibrous material that passes through a 5 mm sieve. 4. The glass fiber reinforced thermosetting resin according to claim 2, wherein the crushed material of the fibrous glass fiber reinforced thermosetting resin is further beaten to crush and disintegrate into single fibers. Concrete products to do. 5. A mixture ratio of 5 to 30%
Concrete products using the glass fiber reinforced thermosetting resin described in 2, 3, 4 as a reinforcing material. 6. A method for producing a concrete product comprising a glass fiber reinforced thermosetting resin as a reinforcing material, which is obtained by kneading a fibrous crushed material of a glass fiber reinforced thermosetting resin with mortar or concrete and then molding and solidifying. Method. 7. A glass fiber reinforced thermosetting resin as a reinforcing material, which is obtained by kneading a fibrous crushed product of a glass fiber reinforced thermosetting resin into mortar or concrete, pressurizing and dehydrating, and then molding and solidifying. Method for manufacturing concrete products. 8. The glass fiber reinforced thermosetting resin fibrous crushed material is further beaten to crush and disintegrate into single fibers.
7. A method for producing a concrete product using the glass fiber reinforced thermosetting resin according to 7 as a reinforcing material. 9. The method for producing a concrete product using a glass fiber reinforced thermosetting resin as a reinforcing material according to claim 6, 7 or 8, wherein a lightweight aggregate is mixed into the mortar or concrete. 10. The method for producing a concrete product using a glass fiber reinforced thermosetting resin as a reinforcing material according to claim 6, wherein inorganic powder is mixed in the mortar or concrete. 11. A glass fiber reinforced thermosetting resin characterized in that mortar or concrete is packed into a mold in a plurality of layers, and plate-shaped glass fiber reinforced thermosetting resin is sandwiched between the layers to be molded and solidified. A method for producing a concrete product using as a reinforcing material.