JP6835510B2 - Reinforcement material for building civil engineering, concrete structure using this, concrete slab structure and its construction method and reinforcement method - Google Patents

Description

The present invention is a fiber reinforced plastic (hereinafter, also referred to as "FRP") reinforcement embedded in a structure to reinforce a building civil engineering structure, and a concrete floor slab structure constructed by using the same. And its construction method and reinforcement method.

According to a large-scale highway renewal and repair plan announced in the past days, a large amount of budget is allocated to the replacement and repair work of floor slabs on bridges. There are many places where it is difficult to replace the floor slab due to construction conditions such as the traffic regulation period, and in those places repairs will be carried out by reinforcing the floor slab from the top surface.

As a method of reinforcing from the upper surface of the floor slab, for example, a method of thickening the upper surface by placing steel fiber concrete on the upper surface of the floor slab and integrating old and new concrete to reinforce by increasing the thickness of the floor slab is known. In addition, the surface layer of the existing floor slab is suspended at a depth where the embedded reinforcing bars are not exposed, and the suspended portion is treated by applying a primer and laying resin mortar on it, and then reinforcing bars made of FRP. There is known an FRP reinforcement method in which a material is placed on a chipping portion and then a resin mortar is cast to restore the surface layer portion of the floor slab (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2003-176508

In the above-mentioned top surface thickening method, in order to secure the filling property of the additional reinforcing reinforcing bar, it is necessary to increase the thickness by about 10 cm to a certain thickness of concrete, which increases the floor slab thickness, which causes an increase in dead load. , There is a problem that the burden on the existing skeleton increases. Since the road surface height also changes, it will be necessary to review the alignment including the expansion and contraction device.
On the other hand, although the FRP reinforcement method uses an instantly curable resin mortar, there are many steps and it is necessary to secure a curing time in each step, so that there is a problem that it is difficult to shorten the construction period.
Since the total length of highway bridges that need to be extensively renewed and repaired at an early stage is several hundred kilometers, the construction to strengthen and reinforce the floor slab can be done in a short traffic regulation period with less weight increase. It is required that construction can be carried out reliably and promptly, and the development of a new construction method that realizes this is required.

In view of such problems of the prior art, the present invention has developed a reinforcing bar for building civil engineering having excellent fixability inside the structure when reinforcing and repairing a concrete structure in which reinforcing bars are embedded. The challenge is to use this to reinforce and repair floor slabs such as highway bridges in a short construction period while suppressing weight increase.

In the conventional FRP reinforcement method, a resin mortar layer as an undercoat is formed on the floor slab, an FRP reinforcing bar is installed on the upper surface thereof, and then a resin mortar is further placed to fill the reinforcing bars. Since it has been returned, the curing time of the entire construction will be long, and it will be difficult to shorten the construction period. When a fast-curing mortar is used instead of the resin mortar, the reinforcing bar made of FRP has a small adhesive force to concrete and the like and does not have high fixability, so that a sufficient reinforcing effect cannot be obtained as it is.

Therefore, in the present invention, by providing a plurality of fixing portions on the outer periphery of the FRP reinforcing material, the adhesive force with the structural material such as concrete is improved, and the reinforcing material is surely integrated with the structural material. The concrete structure can be effectively reinforced.

That is, in the reinforcing material for building civil engineering of the present invention, a pipe body made of a fiber-reinforced resin material passed through the outer periphery of the reinforcing material main body made of FRP is made of an epoxy resin filler or expanded cement. It is characterized in that it has a structure in which a plurality of protrusions formed by fixing to the main body of the reinforcing material are provided.

In the reinforcing material having the above structure, the reinforcing material body is preferably a rod made of either a carbon fiber reinforced resin material (hereinafter, also referred to as “CFRP”) or an aramid fiber reinforced resin material (hereinafter, also referred to as “AFRP”). Can be formed with a highly elastic CFRP rod.
Further, the tube body constituting the protrusion can be formed of any of glass fiber reinforced resin material (hereinafter, also referred to as "GFRP"), CFRP, and AFRP.
An epoxy resin filler or expanded cement can be used as the fixing agent for fixing the tube body to the reinforcing material body.

The reinforced material having the above structure is characterized in that the outer diameter (S) of the tubular body and the diameter (φ) of the reinforced material body satisfy the following relational expression.
(Relational formula) φ + 6 mm ≤ S ≤ φ + 35 mm
Further, it is characterized in that the inner diameter (T) of the pipe body and the diameter (φ) of the barbed material body have a configuration satisfying the following relational expression.
(Relational formula) φ + 2 mm ≤ T ≤ φ + 10 mm

Further, the muscle material having the above structure is characterized in that the length of the tubular body is 30 to 70 mm.
Further, the thickness of the tube is 1 to 8 mm.
Further, it is characterized in that the distance between adjacent pipe bodies is 100 to 1500 mm.
It is also characterized in that the content of the fibrous reinforcing material in the fiber reinforced resin material is 30 to 80% by volume in the reinforcing material having the above structure.

The reinforcement for construction and civil engineering of the present invention comprises a reinforcement body formed to have an appropriate diameter and length, and a plurality of pipe bodies having an appropriate length formed into a tubular shape having an inner diameter that fits the outer circumference of the reinforcement body. Prepare, pass the pipe body through the outer circumference of the reinforcing material body, and fill the fixing agent between the outer peripheral surface of the reinforcing material body and the inner peripheral surface of the pipe body at positions where adjacent pipe bodies are spaced apart from each other. Each tube is formed by fixing each tube to the bar body, and each tube fixed to the bar body becomes a large-diameter protrusion protruding outward from the outer circumference of the bar body.

When forming a concrete structure, the reinforcing material for building civil engineering of the present invention configured as described above can be used as a means for embedding in the structural material to reinforce the concrete structure.
Further, when forming a concrete floor slab structure, it can be used as a means for reinforcing the floor slab by embedding it in the concrete floor slab.
In addition, the reinforcing material for building civil engineering of the present invention can be used as a reinforcing material embedded in a structural material to reinforce various concrete structures such as buildings, roads, bridges, waterways, and embankments. ..

Further, the present invention relates to a method for constructing a concrete floor slab structure in which an asphalt pavement is provided on a concrete floor slab.
The process of installing a plurality of reinforcements for building civil engineering with the above configuration on a concrete floor slab, and
The process of placing a fast-curing mortar on the concrete floor slab on which the reinforcement for building civil engineering is installed, and
It is characterized by having a step of laying an asphalt pavement on the fast-curing mortar.

Further, the present invention relates to a method for reinforcing an existing concrete slab structure in which an asphalt pavement is provided on a concrete slab.
The process of removing the asphalt pavement and
The process of installing a plurality of reinforcements for building civil engineering with the above configuration on a concrete floor slab, and
The process of placing a fast-curing mortar on the concrete floor slab on which the reinforcement for building civil engineering is installed, and
It is characterized by having a step of laying an asphalt pavement on the fast-curing mortar.

Further, the present invention relates to a method for reinforcing an existing concrete slab structure.
The process of cutting the upper surface of the existing concrete floor slab to the depth where the reinforcing bars placed inside it are exposed, and
A process of installing a plurality of building civil engineering bars having the above configuration on the upper surface of the excised portion, and
It is characterized by having a step of placing a quick-curing mortar on a concrete floor slab on which the reinforcing material for building civil engineering is installed.

In the above-mentioned construction method and reinforcement method, the concrete floor slab is reinforced concrete in which reinforcing bars are arranged inside, and the reinforcing bar for building civil engineering of the present invention is installed on the concrete floor slab or after the upper part is cut off, and a quick-curing mortar is struck. A concrete slab structure integrated with the lower concrete slab is formed. The asphalt pavement is laid on it.
According to this, the building civil engineering reinforcement embedded in the structural material is provided in a shape in which a plurality of protrusions are integrated at appropriate intervals along the outer periphery of the FRP muscle body. Therefore, peeling stress is unlikely to occur at the interface with the fast-curing mortar, the reinforcing material is highly adhesive and reliably integrated with the mortar, and even if the concrete floor slab is pulled or bent, the reinforcing material is difficult to pull out, which is a structural material. It is possible to effectively reinforce concrete slabs by improving physical properties such as impact resistance, bending strength, and abrasion resistance. Since the reinforcing material is provided in a shape that exhibits high adhesion to concrete, it is possible to construct and reinforce a concrete slab structure in a short construction period by using fast-curing mortar or concrete.
In addition, FRP reinforcing bars have excellent corrosion resistance, and CFRP reinforcing bars with a Young's modulus of twice or more that of iron have a high stress relaxation effect on the reinforcing bars and increase the strength of the concrete floor slab. be able to.

It is external drawing of the reinforcement material for building civil engineering of one Embodiment of this invention. It is a partial cross-sectional view of the reinforcement material for building civil engineering of FIG. It is schematic cross-sectional view of the road bridge which reinforces a floor slab by using the reinforcement for building civil engineering of this invention. FIGS. (A) to (D) are diagrams for explaining a step of reinforcing the portion A in FIG. 3 in an enlarged manner. It is a figure which showed the structure of the measurement system of the tensile test in an Example.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. The form of the illustrated reinforcement for building civil engineering and the form of the structure to be reinforced by using the same are not limited to the present invention.

FIG. 1 shows the appearance of a reinforcing material for building civil engineering according to an embodiment of the present invention (hereinafter, also simply referred to as “reinforced material”), and FIG. 2 shows an enlarged cross section of a main part thereof.
The illustrated reinforcing material 1 is made of FRP, preferably made of CFRP or AFRP, and is made of FRP, preferably made of GFRP, CFRP, or on the outer periphery of the main body 2 made of FRP having an appropriate diameter (φ) and length. A plurality of protrusions 3 formed by passing a tube 4 made of AFRP, more preferably GFRP, and fixing the tube 4 to the muscle body 2 with a fixing agent 5 are integrally provided.

Specifically, the reinforcing material main body 2 is formed to have an appropriate diameter (φ) and length, and is appropriately formed on the outer circumference thereof in a tubular shape having an inner diameter (T) slightly larger than the diameter (φ) of the reinforcing material main body 2. A fixing agent is passed between a plurality of pipe bodies 4 having a large length and adjacent pipe bodies 4 and 4 are spaced apart from each other by a predetermined distance between the outer peripheral surface of the reinforcing material main body 2 and the inner peripheral surface of the pipe body 4. 5 is filled, each tube 4 is fixed to the bar body 2, and each tube 4 fixed to the bar 4 has a large diameter protruding outward from the outer periphery of the bar body 2. The muscle member 1 can be formed by integrating the protrusions 3.

The tubular body 4 is preferably manufactured in advance. For example, a fibrous filler such as roving-shaped glass fiber is impregnated with a resin component such as an epoxy resin and wound around a core material to a desired thickness. After that, the tube body 4 can be obtained by curing the resin component and extracting the core material.

The content of the fibrous reinforcing material such as carbon fiber, glass fiber, and aramid fiber contained in the fiber reinforced resin material constituting the tubular body 4 is preferably 30 to 80% by volume in the fiber reinforced resin material, and is 40. It is more preferably ~ 75% by volume, and even more preferably 50 to 70% by volume.

As the fixing agent 5 for fixing the tubular body 4 to the outer periphery of the reinforcing material main body 2, a thermosetting resin, a thermoplastic resin, a moisture-curable resin, mortar, cement or the like can be used.
Examples of the thermosetting resin include phenol resin, epoxy resin, melamine resin, urea resin, unsaturated polyester resin, urethane resin, alkyd resin, and polyimide resin.

Examples of the thermoplastic resin include olefin resins such as polyethylene, polypropylene and cyclic polyolefin, polyester resins such as polybutylene terephthalate and polyethylene terephthalate, styrene resins such as polystyrene, ABS resin and AS resin, polyvinyl chloride and polyacetic acid. Vinyl, acrylic resin, polyamide resin, polyacetal resin, polycarbonate resin, modified polyphenylene ether, polyphenylene sulfide (PPS), polysulfone, polyether sulfone, amorphous polyarylate, liquid crystal polymer, polyether ether ketone (PEEK), urethane resin And so on.

Examples of the moisture-curable resin include urethane resin and modified silicone resin, which are resins in which isocyanate groups are generated by moisture.
Examples of the mortar include expanded mortar, lightweight mortar, and refractory mortar.
Cement includes ordinary Portland cement mainly composed of calcium silicate, calcium aluminate, calcium sulfate, calcium oxide, etc., early-strength Portland cement, ultra-early-strength Portland cement, moderate heat Portland cement, white Portland cement, blast furnace Portland cement. , Ultrafast hard cement, silica cement, fly ash cement, aluminum cement, expansion cement, sulfate resistant cement, blast furnace colloid cement, colloid cement and the like.
As the cement, water and a known admixture for cement, for example, shrinkage compensator, curing accelerator, curing retarder, dispersant, air entraining agent, thickener, water reducing agent, filler and the like are used in combination, if necessary. be able to.
Among them, epoxy resin-based fillers and cements such as epoxy resins are preferable, and expanded cements are more preferable, from the viewpoint of the degree of adhesion stress with an object to be fixed such as concrete.

The conditions for forming the bar 1 such as the diameter and length of the bar body 2, the length of the tube body 4, the number of pieces integrated with the bar body 2, and the arrangement interval are appropriately determined according to the construction site to be reinforced by using the bar body 1. Can be set to.

In order to obtain a sufficient reinforcing effect, it is preferable to set the following formation conditions.
That is, the diameter (φ) of the streak body 2 is preferably set to 5 to 20 mm, and more preferably 7 to 15 mm.

Further, the inner diameter (T) of the tubular body 4 is set larger than the diameter (φ) of the reinforcing material main body 2, but is set in the range of (φ + 2 mm ≦ T ≦ φ + 10 mm) in relation to the diameter (φ). It is preferable that it is set to (φ + 4 mm ≦ T ≦ φ + 8 mm).

The outer diameter (S) of the tubular body 4 is also set to be larger than the diameter (φ) of the barbed body 2, but is set in the range of (φ + 6 mm ≦ S ≦ φ + 35 mm) in relation to the diameter (φ). It is preferable, more preferably (φ + 8 mm ≦ S ≦ φ + 30 mm), and even more preferably (φ + 10 mm ≦ S ≦ φ + 20 mm).

The thickness of the tubular body 4 is preferably set to 1 to 8 mm, more preferably 1.5 to 5 mm, and even more preferably 2 to 4 mm.

The length of the tubular body 4 is preferably set to 10 to 80 mm, more preferably 30 to 70 mm, and even more preferably 40 to 60 mm. If the length is smaller than 30 mm, the pipe body 4 can easily come out from the barbed body 2, and if the length exceeds 70 mm, the fast-curing mortar or the like cast on the concrete floor slab containing the barbed material 1 cracks. It is not preferable because it may cause destruction.

Further, the distance between the adjacent pipe bodies 4 and 4 is preferably set to 100 to 1500 mm, more preferably 150 to 1000 mm, and further preferably 200 to 500 mm. If the distance between the adjacent pipes 4 and 4 is smaller than 100 mm, the filling of the fast-curing mortar between the adjacent pipes 4 may be insufficient, while if the distance exceeds 1000 mm, the distance between the adjacent pipes 4 and 4 may be insufficient. It is not preferable because stress tends to be concentrated on one tube body 4 and the muscle member 1 may break. The distance between the adjacent pipe bodies 4 and 4 means the distance between the end portion of one pipe body 4 among the plurality of pipe bodies 4 and the end portion of the other pipe bodies 4 adjacent thereto.

If the porosity, inner diameter and outer diameter, length, interval, etc. differ depending on the measurement location in the above preferable setting range, the average value thereof is adopted.

In the present invention, by providing a plurality of such pipe bodies 4 on the FRP-made reinforcement body 2, the tensile force applied to the pipe body 4 is dispersed, and the reinforcement body 2 breaks or comes out of the pipe body 4. The barbed body 2 and the pipe body 4 can be reliably integrated to effectively reinforce the concrete structure.

For example, when it is used for reinforcing the floor slab of a highway bridge described later, a plurality of GFRP pipes 4 having an inner diameter of 18 mm and a length of 50 mm are passed through the outer circumference of a CFRP barbed body 2 having a diameter of 12 mm. It is possible to use the reinforcing material 1 formed by fixing the respective tubular bodies 4 to the reinforcing material main body 2 with the fixing agent 5 at positions where the adjacent tubular bodies 4 and 4 are spaced apart from each other by about 30 mm.

The barbed material 1 configured in this way is embedded in the concrete structure as follows during the repair work for reinforcing the concrete slab 6 in the bridge of the highway as shown in FIG. The concrete floor slab 6 can be reinforced.

As shown in FIG. 4 (A), the concrete floor slab 6 to be repaired is a concrete structure in which reinforcing bars 7 are arranged inside, and in the repair work for reinforcing this, first, FIG. As shown in, the surface of the concrete floor slab 6 is cut to a depth where the reinforcing bars 7 arranged on the upper side of the inside are exposed. If an asphalt pavement (not shown) is laid on the upper surface of the concrete floor slab 6, remove it. The cut-out portion of the upper part of the concrete floor slab 6 is appropriately treated.

Next, as shown in FIG. 1C, a plurality of the muscle members 1 are installed in parallel on the upper surface of the excised portion of the muscle material 1 shown in FIG. At this time, the reinforcement 1 is arranged so as to face in the direction perpendicular to the bridge axis direction of the bridge body 8 that supports the concrete floor slab 6.

Then, as shown in FIG. 3D, the fast-curing mortar 9 is cast and cured so as to have substantially the same thickness as before the excision with respect to the excised portion where the muscle material 1 is installed. Then, the repair work is completed. If an asphalt pavement is laid on the upper surface of the concrete floor slab 6, the asphalt pavement is laid after the mortar 9 is hardened, and the construction is completed.

According to this, since the reinforcing material 1 is provided in a shape in which a plurality of protrusions 3 are integrated along the outer circumference of the muscle body body 2 made of FRP at appropriate intervals, the reinforcing material 1 is expensive. It is firmly integrated with the mortar 9 due to its adhesiveness, and even if the concrete floor slab 6 is pulled or bent, the reinforcement 1 is difficult to pull out, improving the physical properties such as impact resistance, bending strength, and abrasion resistance of the structural material. The concrete floor slab 1 can be effectively reinforced. By placing a fast-curing mortar 9 in the excised portion of the upper part of the concrete slab 6 and backfilling the barbed material 1, the concrete slab 6 can be reinforced in a short construction period without increasing its thickness. It is possible.

Next, an example of embedding the barbed material 1 of the present invention in the concrete structure and testing the adhesion performance will be described.

[Experiment 1]
(Example 1)
A GFRP tube 4 (glass fiber content) having an inner diameter (T) of 18 mm, a length of 50 mm, an outer diameter (S) of 24 mm, and a thickness of 3 mm is formed on the outer circumference of a highly elastic CFRP bar body 2 having a diameter (φ) of 12 mm. 65.6% by volume) was passed through and fixed using an epoxy resin-based filler as a fixing agent 5, to form a reinforcing material 1 in which one protrusion 3 was integrated on the outer periphery of the reinforcing material main body 2. The fixing length (L) of the tubular body 4 was 110 mm (see FIG. 5).

(Example 2)
The barbed material 1 was formed under the same conditions as in Example 1 except that expanded cement was used as the fixing agent 5.

(Comparative Example 1)
A reinforcing bar (D13) having a diameter of 13 mm was used as the reinforcing bar.

(Comparative Example 2)
A rod made of highly elastic CFRP having a diameter of 12 mm was used as a barbed material.

Three bars of each example and comparative example were produced, and these were installed in the formwork so as to be the test piece shown in FIG. 5, and then concrete was poured into the formwork and the bars were integrally embedded. A concrete block test piece having a size of 100 mm × 100 mm in length and width and 160 mm in height and having pores having a diameter of 20 mm and a length of 50 mm was formed in the center of the lower part. The strength of the concrete block is 21 N / mm ² .
A steel sleeve is fixed to the end of the barbed material exposed from the concrete block of each test piece, and the steel sleeve is pulled downward while supporting the test piece with the steel sleeve facing downward, and the barbed material is a concrete block. The maximum tensile strength (Pmax) at the time of detachment from the concrete was measured.
The degree of adhesive stress was derived from the measured maximum tensile strength, and the average value of each example and comparative example was obtained. The results are shown in Table 1.

According to the measurement results of Experiment 1, the degree of adhesion stress of the barbed material to the concrete block was substantially the same as that of Comparative Example 1 in Example 1, and Example 2 using expanded cement as the fixing agent 5 of the pipe body 4. It was confirmed that a higher adhesiveness than that of Comparative Example 1 was obtained.
Since the reinforcing bars are not used in Examples 1 and 2, there is no concern that corrosion such as rust will occur due to the moisture contained in the cement even after the repair.

[Experiment 2]
(Example 3)
The reinforcing material 1 was formed under the same conditions as in Example 1 except that expansion cement was used as the fixing agent 5 and the length of the tubular body 4 was 30 mm.

(Example 4)
The barbed material 1 was formed under the same conditions as in Example 1 except that expanded cement was used as the fixing agent 5.

(Example 5)
The reinforcing material 1 was formed under the same conditions as in Example 1 except that expanded cement was used as the fixing agent 5 and the length of the tubular body 4 was 70 mm.

Three reinforcements of each example were produced, and in the same manner as in Experiment 1, the reinforcements were integrally embedded, and the length and width were 100 mm × 100 mm, the height was 140 mm (Example 3), 160 mm (Example 4), and so on. A concrete block test piece having a size of 180 mm (Example 5) and having pores having a diameter of 20 mm and a length of 50 mm was formed in the center of the lower part. The fixing length (L) of the tubular body 4 was 90 mm in Example 3, 110 mm in Example 4, and 130 mm in Example 5. The strength of the concrete block is 29 N / mm ² .
A steel sleeve is fixed to the end of the barbed material exposed from the concrete block of each test piece, and the steel sleeve is pulled downward while supporting the test piece with the steel sleeve facing downward, and the barbed material is a concrete block. The maximum tensile strength (Pmax) at the time of detachment from the concrete was measured.
The degree of adhesive stress was derived from the measured maximum tensile strength, and the average value of each example and comparative example was obtained. The results are shown in Table 2.

According to the measurement results of Experiment 2 in which the length of the pipe body 4 was changed, the degree of adhesion stress of the barbed material to the concrete block was found in Example 4 in which the length of the pipe body 4 was 50 mm, respectively. It was confirmed that the length was higher than that when the length was set to 30 mm and the length of Example 5 was set to 70 mm.

1 Reinforcing bar, 2 Reinforcing bar body, 3 Protrusions, 4 Pipes, 5 Fixing agent, 6 Concrete floor slab, 7 Reinforcing bars, 8 Bridges, 9 Mortar

Claims (10)

A tube made of a fiber-reinforced resin material passed through the outer periphery of a fiber-reinforced resin body (FRP) is passed through the outer periphery of the fiber-reinforced resin body (FRP) with an epoxy resin filler or a fixing agent made of expanded cement. It is a reinforcement for building civil engineering having a configuration in which a plurality of protrusions fixed to the main body are provided, and the diameter (φ) of the reinforcement main body, the outer diameter (S) of the pipe body forming the protrusions, and A reinforcing material for construction and civil engineering, characterized in that the inner diameter (T) satisfies the following relational expression and the length and thickness of the pipe body satisfy the following conditions.
(Relational formula) φ + 10 mm ≤ S ≤ φ + 20 mm
φ + 4mm ≤ T ≤ φ + 8mm
(Length of tube) 50-70 mm (Thickness of tube) 3-8 mm The reinforcing material for building civil engineering according to claim 1, wherein the reinforcing material main body is formed of either a carbon fiber reinforced resin material (CFRP) or an aramid fiber reinforced resin material (AFRP). The invention according to claim 1 or 2, wherein the tube body is made of any one of a glass fiber reinforced resin material (GFRP), a carbon fiber reinforced resin material (CFRP), and an aramid fiber reinforced resin material (AFRP). Reinforcement for construction and civil engineering. The reinforcing material for building civil engineering according to any one of claims 1 to 3, wherein the distance between adjacent pipe bodies is 100 to 1500 mm. The reinforcing material for building civil engineering according to any one of claims 1 to 4, wherein the content of the fibrous reinforcing material in the fiber reinforced resin material is 30 to 80% by volume. A concrete structure formed by using the reinforcing material for building civil engineering according to any one of claims 1 to 5. A concrete slab structure formed by using the reinforcing material for building civil engineering according to any one of claims 1 to 5. In the construction method of the concrete slab structure in which the asphalt pavement is provided on the concrete slab.
A step of installing a plurality of building civil engineering reinforcements according to any one of claims 1 to 5 on a concrete slab, and
The process of placing a fast-curing mortar on the concrete floor slab on which the reinforcement for building civil engineering is installed, and
A method for constructing a concrete floor slab structure, which comprises a step of laying an asphalt pavement on the fast-curing mortar. In a method of reinforcing an existing concrete slab structure in which an asphalt pavement is provided on a concrete slab.
The process of removing the asphalt pavement and
A step of installing a plurality of building civil engineering reinforcements according to any one of claims 1 to 5 on a concrete slab, and
The process of placing a fast-curing mortar on the concrete floor slab on which the reinforcement for building civil engineering is installed, and
A method for reinforcing a concrete floor slab structure, which comprises a step of laying an asphalt pavement on the fast-curing mortar and a method of laying the asphalt pavement. In the method of reinforcing the existing concrete slab structure,
The process of cutting the upper surface of the existing concrete floor slab to the depth where the reinforcing bars placed inside it are exposed, and
A step of installing a plurality of building civil engineering reinforcements according to any one of claims 1 to 5 on the upper surface of the excised portion.
A method for reinforcing a concrete floor slab structure, which comprises a step of placing a quick-curing mortar on a concrete floor slab on which a reinforcement for building civil engineering is installed.

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