JPH1150034A - Adhesive composition for panel for mending road bridge floor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject composition useful for the mutual-bonding of inorganic building materials such as cement mortar and concrete by mixing aluminum hydroxide, etc., and silicate ponder, etc., into a methacrylate-modified epoxy resin composition. SOLUTION: The objective adhesive composition is produced by compounding (A) a main agent consisting of a methacrylate-modified epoxy resin composition composed of (a) an epoxy resin, (b) a methacrylate and (c) a modified polyamine curing agent with (B) the 1st filler consisting of aluminum hydroxide and alumina cement and (C) the 2nd filler consisting of silicate powder and silica balloon. The compounding ratios of the fillers to the main agent are selected to give a tensile strength comparable to the tensile strength of the concrete floor plate of a road bridge. The mending panel 51 as the 1st layer and the mending panel 52 as the 2nd layer are bonded to a concrete floor plate 1 reinforced with steel bars 2 using the objective adhesive layer 4 and an asphalt paving 3 is applied to the surface of the panel.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention generally belongs to the field of bonding technology used for bonding cement mortar, concrete and other inorganic building materials, and in particular, a road bridge which receives a large load on the main surface of the building material. The present invention relates to a composition of an adhesive used for repairing a bridge deck using a repair panel when the bridge deck is damaged by aging or deterioration.

[0002]

In recent years, vehicles have become larger,
With the increase in speed, the floor boards of road bridges are frequently damaged and deteriorated rapidly, which poses a major problem for road maintenance. In other words, the trouble of patrol monitoring for finding breakage and deterioration of floorboards has been drastically increased, and it is necessary to repair immediately if a damaged portion is found, but the frequency of the repair has been significantly increased. . The need to prohibit or restrict traffic during repair work hinders the smoothness of road traffic, and at the same time, increasing the frequency of patrols and repairs immediately increases the cost of maintaining and managing road bridges.

[0003] In other words, assuming that the increase in the size and speed of vehicles is inevitable in social life including industrial activities, vehicle traffic on road bridges that load an important part of road traffic as social infrastructure. It must be said that reducing the maintenance costs of road bridges while maintaining smoothness is extremely important. Therefore, it is a basic problem to be solved by the present invention to provide a technique capable of reducing the maintenance and management cost of a road bridge while ensuring smooth vehicle traffic.

[0004]

2. Description of the Related Art Conventionally, a method of repairing a road bridge floor using a repair panel, called "D-RAP method" developed by Japan Highway Public Corporation, is known.

FIG. 1 shows an example of a general road bridge floor before repair work is performed. That is, this bridge floor is provided with asphalt pavement 3 (thickness 75 mm) on concrete floor plate 1 (thickness 170 mm) containing reinforcing bars 2.

FIG. 2 is an example of a bridge deck with a repair method using a repair panel, such as the “D-RAP method”,

FIG. 1 shows an adhesive layer 4 on a concrete floor 1 similar to that of FIG.
A first layer repair panel 51 (thickness 12 mm) is laid through the above, a similar second layer repair panel 52 (thickness 12 mm) is further laid, and asphalt pavement 3 (thickness 45 mm). However, the repair panels 51 and 52 are each made of fiber reinforced cement in the “D-RAP method”. The repair panels 51 and 52 of the first and second layers are arranged in a staggered manner so that the joints of the panels do not line up.

[0005] In order to repair the deteriorated existing bridge floor,
The asphalt pavement 3 at the damaged portion is cut open, the damaged portion of the concrete floor 1 is removed or the mortar is repaired, and the repaired concrete floor 1 is provided with two layers of repair panels 51 and 52 via the adhesive layer 4 respectively. After installation, the incision in the asphalt pavement 3 is repaired.

Thus, the repair work of the road bridge floor by the "D-RAP method" is completed. Since the repair panel used in the "D-RAP method" is made of fiber reinforced cement, the unit volume is reduced. The weight per unit (hereinafter referred to as “bulk specific gravity”) is as large as 2400 to 2600 kg / m ^3. Therefore, when the thickness of one panel is set to, for example, 12 mm so as to withstand the load requirement, 450
If the size is not small such as mm × 300 mm, it is too heavy and is inconvenient for carrying or laying during construction. Therefore, since the number of sheets required for one construction is large, the number of man-made works is also increased, and at the same time, the construction period is prolonged, which causes a hindrance to vehicle traffic.

[0007]

Means for Solving the Problems On the other hand, the present inventor has filed Japanese Patent Application No. 7-275031 (Title of Invention: Fire-resistant board composition).
In the specification of the application, a fire resistant panel (hereinafter, referred to as "Thomas fire resistant board") having high bending strength and low water absorption despite having a very low bulk specific gravity is disclosed.

[0008] The above-mentioned "Thomas fireproof board" comprises 35-40% by weight of wood waste material, 35-40% by weight of plastic waste material,
And a panel of a composition comprising a refractory binder, wherein aluminum hydroxide, sodium silicate, calcium chloride, alumina cement, silica powder and the like are used as the refractory binder. Most of the composition is industrial waste and household waste, and the production cost is low. Besides,

As is apparent from Table 1, the bulk specific gravity and the water absorption are also remarkably small. Also, the counterforce against the load received on the main surface of the panel can be compared by the numerical value of the bending strength,

As can be seen from Table 1, "Thomas fireproof board" has a larger bending strength than the repair panel used in "D-RAP method".

[Table 1] However, the "D panel" is a repair panel used in the "D-RAP method" The size of each panel is 450 mm x 300 mm x 12 m
m

Therefore, it is naturally expected that "Thomas fireproof board" can be advantageously used as a repair panel for a bridge floor. However, "D-RAP method"
As can be seen from the findings of the above, the repair panel needs to be integrated with the concrete floor plate by bonding it to the concrete floor plate using an adhesive. Moreover, the adhesive does not simply mean fixing the panel to the floorboard. The repair panel needs to maintain a stable adhesion state to the concrete floor continuously in a use state of a road bridge on which various heavy vehicles run without interruption. In other words, the loss of the adhesive state between the two plate-shaped objects subjected to the stress of the load on the main surface or the stress of the vibration due to the adhesive is caused by the breakage of the solidified plate-shaped adhesive itself and the bonding object. The only cause is not peeling at the interface with the adhesive. The present inventor has found that the cause of the cracking or pulling failure of the object itself with the adhesive adhered strongly and accurately is rather the cause. If the loss of adhesion is solely due to the former,
One should use an adhesive that is as large as possible and has the tensile strength that is the adhesive force of the adhesive.

The present inventor conducted the following experiment in order to elucidate the relationship between the loss of the bonding state of concrete and the bonding strength of the adhesive used for bonding. That is,

Referring to FIG. 3, 6 is 40 cm × 4 cm × 4 cm
And a bottom surface of which is provided with an adhesive layer 7 having a thickness of 1 cm. Two such levers 8
A load P is applied at the center of the upper surface.

According to the present invention, the adhesive is an epoxy resin,
A methacrylate-modified epoxy resin composition comprising methacrylate and a modified polyamine curing agent is used as a main component, and a second filler selected from aluminum hydroxide and alumina cement and a second filler selected from silica powder and silica balun are used as the main component. The filler is blended. Here, the first filler is mainly for imparting fire resistance and flame resistance to the adhesive composition, and the second filler is mainly for adjusting the degree of adhesion to concrete.

In the above experiment, the following samples # 0 to # 2 were used as specimens. Sample # 0: 100 parts by weight of the main agent mixed with 40 parts by weight of the first filler (composition of 70 parts by weight of aluminum hydroxide and 30 parts by weight of alumina cement) Sample # 1: 100 in sample # 0 100 parts by weight of the second filler, silica powder (100 parts by weight) Sample # 2: 100 parts by weight of sample # 0, silica balun as the second filler (100 parts by weight of silica powder) Of the same volume and volume)

[Table 2]

[0013]

Table 2 shows numerical values indicating physical properties of each of the samples. In this table, it is particularly necessary to pay attention to the numerical value of the adhesive strength. In this table, "adhesive strength" represents the tensile strength at the interface between the adhesive and the concrete to be bonded, and it is considered that the larger the value, the greater the adhesiveness of the adhesive to concrete. Therefore,
When repairing a concrete bridge floor using the repair panel described above, it is considered that the larger the adhesive strength of the adhesive, the more reliable the integration of the repair panel and the bridge floor plate becomes. .

Now, in the above experiment, when the sample # 1 was used for the adhesive layer 7 and the load P was gradually increased from 0,
At around P = 5000 kg, the concrete layer 6 cracked along the bottom surface, and subsequently the adhesive layer 7 also cracked, and the specimen was soon broken. On the other hand, when the sample # 2 was used for the adhesive layer 7, the sample was broken at P = 5,500 kg. Until then, the adhesive layer 7 was separated from the concrete layer 6 and the concrete was cracked along the interface. Was not observed and the two layers were broken in an integrated state.

Here,

If attention to the bonding strength of Table 2, the adhesive strength of the sample # 1 whereas a 33.4 kg / cm ^2, a sample # 2, 30.7kg / cm ^2, than Sample # 1 Pretty small. On the other hand, the tensile strength of the concrete layer 6 of the specimen was 30.0 kg / cm ^2, which was almost the same as that of a concrete floor plate used for a general bridge floor.

Thus, from the results of the above experiment,
When repairing a concrete floor slab of a road bridge by bonding a repair panel, the adhesive whose tensile strength is almost equivalent to the tensile strength of the concrete floor slab is used.
It has become clear that the concrete floor panel and the repair panel can withstand a large surface load in an integrated state, and that unnecessarily high adhesiveness is rather inappropriate.

That is, the adhesive composition according to the present invention comprises, as a main component, a composition comprising a methacrylate-modified epoxy resin comprising an epoxy resin, methacrylate, and a modified polyamine curing agent, and the main component comprises aluminum hydroxide and alumina cement. A mixture of the selected filler for promoting fire resistance and the filler for adjusting adhesion selected from silica powder and silica balun, and the magnitude of the tensile strength is the same as the tensile strength of the concrete floor plate of the road bridge. The mixing ratio of the filler to the main agent is set so as to antagonize the size of the filler.

When the "Thomas fireproof board" is used as a repair panel, it is inconvenient if the adhesive is flammable. However, according to JIS K 6745 (flame resistance measurement method), the adhesive is 5 parts of the filler per part
When 0 parts or more are blended, it passes the flame retardant grade 1 grade. Further, even if the proportion of the filler is 30% as in the above-mentioned sample # 0, it passes the flame retardancy class 2 grade.

That is, according to the present invention, when repairing a road bridge floor, "Thomas fireproof board" is used as a repair panel.
Can be used. This is because the "Thomas refractory board" has remarkably excellent properties such as uniaxial compressive strength and flexural strength as specified in the specification of Japanese Patent Application No. 7-275031. In addition, the "Thomas fireproof board" is extremely lightweight compared to the conventionally known repair panels, so even if the size is set large, there is no inconvenience in handling such as carrying and laying on the bridge floor, etc. Both artificial and required time are short. Furthermore, as mentioned above,
When the repair panel is attached to a concrete bridge deck using the adhesive of the present invention, the repair panel and the bridge deck are integrated, and both the load resistance and the seismic resistance are significantly increased. Become Thus, according to the present invention, the object of the present invention of developing a technique for reducing the maintenance cost of a road bridge while ensuring smooth vehicle traffic on the road bridge has been completely solved.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION

[0021]

The first filler A is used in an amount of 30 to 60 parts by weight, and the second filler B is used in an amount of 0 to 100 parts by weight of the following base material.
A composition prepared by blending each of 〜150 parts by weight. However, the main component is composed of a methacrylate-modified epoxy resin (75 to 85 parts by weight) and a modified polyamine curing agent (25 to 15 parts by weight) in a total amount of 100 parts by weight. Filler A: 100 parts by weight of aluminum hydroxide (6 parts by weight)
0 to 80 parts by weight) and alumina cement (40 to 20 parts by weight) Filler B: silica powder or silica balun

In the practice of the present invention, the epoxy resin in the methacrylate-modified epoxy resin described above can be used as long as it has two or more epoxy groups in one molecule. Specifically, an epoxy resin having an epoxy equivalent of 100 to 1,000 or a polyhydric alcohol-type epoxy resin can be used alone or in combination of two or more. Further, as the methacrylate, monofunctional methacrylates, difunctional methacrylates, polyfunctional methacrylates, and epoxy acrylates or urethane acrylates obtained by adding acrylic acid to an epoxy resin or urethane at twice or more moles can be used. .

As the curing agent for the methacrylate-modified epoxy resin, in the case of normal temperature curing, fatty acid amines and aromatic amines having active hydrogen can be used alone or in combination. At this time, the amine is preferably used in an amount equivalent to the molar amount of the total composition of the epoxy resin and the methacrylate. Even when these amines are used in combination with the nitrogen-containing heterocyclic compound polyamidoamine, various modified amines, etc., curing at room temperature is possible. Further, aliphatic amines, aromatic amines, and other nitrogen-containing heterocyclic compounds having an amine group can be used as amines as curing agents.
When curing at a low temperature, for example, in an environment of a temperature below the freezing point to 0 ° C., it is effective to use a sulfur-containing organic compound such as mercaptan or polysulfide. Also,
If heat curing is required, organic carboxylic anhydride,
Latent curing agents such as organic peroxides, dicyandiamide, metal complexes of amines and BF ₃ can be used.

In the present specification, aluminum hydroxide and alumina cement are listed as fillers, but they are also flame and fire retardants. In addition, these can be replaced with silica powder, refractory viscosity, chamotte, silica powder, alumina, magnesia, lightly fired dolomite, magnesium chloride, calcium chloride, or the like. However, since aluminum hydroxide has the effect of eliminating bubbles in the resin according to the knowledge of the present inventor, it can be used as a role as a fire retardant and an antifoaming agent.

[0025]

As described above, in repairing a road bridge floor using a repair panel, conventionally, a fiber-containing cement board has been used exclusively as a panel. In place of such a heavy cement board, a very lightweight "Thomas fireproof board" can be used, and therefore, the unit size of the repair panel can be set much larger than before. And due to this, the required man-made in the repair work of the road bridge is reduced,
The construction period has been significantly reduced. In addition, the use of the adhesive of the present invention makes it difficult for the concrete floorboard integrated with the repair panel to be damaged by a heavy load or vibration caused by heavy vehicles. Thus, the present invention greatly contributes to smoothing of road traffic and improvement of economy of road management.

Since the road bridge is not limited to the conventional river bridge and the overpass, the viaduct for the highway has been extended almost indefinitely in recent years. Therefore, the adhesive according to the present invention is used for the "Thomas fireproof board". Contribution to the preservation of the national land environment should be outstanding in that the effective use of industrial waste materials and household waste materials as raw materials by the expansion can be secured.

[Brief description of the drawings]

FIG. 1 is a partial sectional view of a road bridge before repair.

FIG. 2 is a partial cross-sectional view of a road bridge after repair using a repair panel.

FIG. 3 is a schematic front view of a specimen used in a destruction test of a concrete plate.

[Explanation of symbols]

 1 ………………………………………………………………………………………………………………………………………………………………………………………. ……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………. ……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………… ………load

Claims (1)

[Claims] 1. A methacrylate-modified epoxy resin composition comprising an epoxy resin, a methacrylate, and a modified polyamine curing agent as a main component, a first filler selected from aluminum hydroxide and alumina cement, a silica powder and a silica balun. An adhesive composition comprising a second filler selected from the group consisting of: a base material such that the tensile strength of the adhesive composition antagonizes the tensile strength of a concrete floor plate of a road bridge. An adhesive composition for a panel for repairing a road bridge floor, comprising setting a blending ratio of the filler to the above.