JP7023554B2 - Water stop injection - Google Patents

Description

The present invention relates to a still water injecting agent.

Patent Document 1 describes a conventional waterproof injection agent (“filler” in Patent Document 1).
In the invention described in Patent Document 1, an injection hole is drilled so as to lead to a gap portion such as a joint portion or a cracked portion between the floor surface and the wall surface, and the filling material is filled in the injection hole. The filler contains urethane as a main component, and for example, it reacts with water and cures. The cured filler can block the infiltration of groundwater into the voids by filling the voids.

Japanese Unexamined Patent Publication No. 2000-01998

By the way, in general, the height of the groundwater level fluctuates depending on, for example, the amount of rainfall, the tide level, and the like.
Therefore, the groundwater level may continue for a long time when it is lower than the filler. In this case, the filler shrinks due to drying, and as a result, a gap is created between the filler and the inner surface of the gap, and groundwater may leak.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a waterproof injection agent capable of suppressing shrinkage of the waterproof injection agent after it has hardened.

One aspect of the waterproof injection agent according to the present invention contains a polyurethane composition as a main component and contains a plurality of fine aggregates in a dispersed manner.

The water-stopping injection agent of the above aspect according to the present invention has an advantage that it can suppress shrinkage after the water-stopping injection agent is cured.

It is a schematic diagram explaining the first step of the repair method for the concrete structure of one Embodiment which concerns on this invention. It is a schematic diagram explaining the second step of the repair method for the concrete structure as above. It is a schematic diagram explaining the process of filling a filler with respect to the concrete structure of the above. It is a graph which shows the result of the area change in the shrinkage test of Examples 1-6. It is an enlarged view of the period X1 of FIG. It is a graph which shows the result of the volume change in the shrinkage test of Examples 1-6. It is an enlarged view of the period X2 of FIG. It is a schematic diagram explaining the process of filling a filler with respect to a concrete structure. It is a schematic diagram which shows the measurement point of the sample of a test 2. It is a graph which shows the result of the area change in the shrinkage test of Examples 10-19. It is a graph which shows the result of the change of thickness in the shrinkage test of Examples 10-19. It is a graph which shows the result of the volume change in the shrinkage test of Examples 10-19.

(1) Embodiment The water blocking injection agent 1 according to the present embodiment is used to repair the leaked portion 21 generated in the concrete structure 2. The concrete structure 2 according to the present embodiment is a structure in which at least a part thereof is embedded in the ground and may come into contact with the groundwater 4. Examples of the concrete structure 2 include a water tank, a pool, a pit, a ditch, a dam, a bridge girder, a culvert, a waterway, and an underground structure buried underground. Underground structures include, for example, water and sewage facilities, tunnels, etc.
Examples include subways, underground parking lots, basements, underground passages, underground malls, utility tunnels, etc.

The leak point 21 means a void 210 (including a cavity) extending from one surface 24 of the concrete structure 2 in contact with the groundwater 4 to the other surface 23 through the inside of the concrete structure 2. The water passing through the leaked portion 21 enters the inside of the concrete structure 2 through the opening formed on one surface 24 of the concrete structure 2 and leaks from the other surface 23. Examples of the void 210 according to the present disclosure include cracks generated in the concrete structure 2, a bean plate (junker), a concrete joint, a separator, a pipe, a penetration portion through which a steel material or the like penetrates the concrete structure 2, and the like. Be done.

As shown in FIG. 2, the water blocking injection agent 1 is injected into the hole 22 formed on the surface 23 of the concrete structure 2 so as to lead to the water leakage point 21 at the time of repair. The still water injection agent 1 is
When injected into the hole 22, not only the hole 22 but also the void 210 leading to the hole 22 is filled.

The waterproof injection agent 1 injected into the void 210 and the hole 22 reacts with water to foam and harden.
In short, the void 210 that causes water leakage is the cured water-stopping injection agent 1 (hereinafter, water-stopping injection agent 1).
The cured material is referred to as "grout material 10", and the material before curing is sometimes referred to as "grout composition"). As a result, the leaked portion 21 generated in the concrete structure 2 can be repaired. The repair method will be described in "(1.2)" described later.
) Repair method ”will be explained in detail.

(1.1) Water-stopping injection agent The water-stopping injection agent 1 according to the present embodiment reacts with water to foam and harden. The water blocking injection agent 1 according to the present embodiment includes a main agent and an additive added to the main agent. The still water injection agent 1 includes a plurality of fine aggregates and a powder polymer as additives.

The main agent is the main material of the waterproof injection agent 1, and is a polyurethane composition in the present embodiment. Specifically, the main agent is a hydrophilic polyurethane composition, and in particular, a one-component hydrophilic polyurethane composition. However, the polyurethane composition according to the present disclosure is not limited to the one-component polyurethane composition, and may be a two-component polyurethane composition, a hydrophobic type, or a hydrophilic type.

The fine aggregate is a fine solid matter. The plurality of fine aggregates are dispersed in the polyurethane composition, and when the polyurethane composition reacts with water to foam, stable foaming can be realized throughout. As a result, the grout material 10 according to the present embodiment has a uniform and relatively high density. In short, according to the water blocking injection agent 1 according to the present embodiment, since a plurality of fine aggregates are contained, a grout material 10 having stable properties can be obtained.

The fine aggregate is preferably a material having stable properties that does not dissolve or change in physical properties when added to the polyurethane composition. The fine aggregate according to this embodiment is organic fine particles.

The organic fine particles according to the present embodiment are polymers (here, acrylic resin) obtained by polymerizing single weight (monomer) molecules of acrylic acid ester, styrene, silicone and nylon. Examples of the acrylic resin include soft acrylic, hard acrylic and crosslinked acrylic. However, the organic fine particles according to the present disclosure are not limited to acrylic resin, and may be a polymer such as polyurethane. Further, as the plurality of fine aggregates, fine particles made of a plurality of acrylic resins and fine particles made of a plurality of polyurethane resins may be mixed.

Examples of the shape of the fine particles include a porous shape, a multi-layered shape having a core layer and a surface layer (for example, two layers), a spherical shape, an elliptical spherical shape, a rectangular parallelepiped shape, a cube shape, a weight shape, a needle shape, and the like. , There are no particular restrictions.

Here, the "fine particles" referred to in the present disclosure are particles having a particle size on the order of microns. The "micron order" here includes the submicron order, for example, 0.
.. It means that it is 1 μm or more and less than 1000 μm.

The average particle size of the organic fine particles according to the present embodiment is preferably 0.3 μm or more and 85 μm or less, more preferably 1 μm or more and 50 μm or less, and further preferably 8 μm or more and 30 μm or less. The average particle size referred to here is measured by the Coulter counter method (electrical resistance method).

The amount of the plurality of fine aggregates added is preferably 10 parts by weight or more and 30 parts by weight or less, more preferably 10 parts by weight or more and 20 parts by weight or less, and further preferably 10 parts by weight or more and 20 parts by weight or less with respect to 100 parts by weight of the polyurethane composition. It is preferably 15 parts by weight or more and 20 parts by weight or less.

Powder polymers are fine particles that have the property of emulsifying. The powder polymer according to this embodiment is a powder of an ethylene-vinyl acetate copolymer resin. However, the powder polymer according to the present disclosure is not limited to the ethylene-vinyl acetate copolymer resin powder, and may be, for example, a polyacrylic acid ester resin-based powder or the like. The amount of the powder polymer added is preferably 1 part by weight or more and 20 parts by weight or less, more preferably 8 parts by weight or more and 12 parts by weight or less, based on 100 parts by weight of the polyurethane composition.

When such a water-stopping injection agent 1 is mixed with water, the polyurethane composition reacts with water to foam and cure. In the water blocking injection agent 1 according to the present embodiment, since the fine aggregate is dispersed substantially uniformly, the grout material 10 having a uniform and relatively high density can be obtained.

(1.2) Repair Method Hereinafter, a repair method will be described as an example of the use of the waterproof injection agent 1 according to the present embodiment. The repair method according to the present embodiment is a method of repairing the leaked portion 21 in the concrete structure 2. The repair method according to the present embodiment includes a first step and a second step. In the present embodiment, as the water leakage point 21, a crack generated in the concrete structure 2 embedded in the ground is taken as an example, and repairing the crack will be described.

The first step is a step of forming a hole 22 through which the leaked portion 21 and the outside are passed. In the first step, as shown in FIG. 1, a tool (here, a hammer drill) is used to drill a hole 22 in the concrete structure 2. Of the surfaces of the concrete structure 2, a hole 22 communicating with the crack is formed on the surface of the surface 23 different from the surface in contact with the groundwater 4 by using a tool.

The hole 22 is formed in a straight line. The longitudinal direction of the hole 22 is inclined with respect to the horizontal plane so as to go upward as it approaches the surface 23. The hole 22 according to the present embodiment has a crack (void 2).
Since it leads to 10), the water passing through the crack reaches the hole 22. The holes 22 are preferably formed at each leak point 21.

The second step is a step of injecting the waterproof injection agent 1 into the hole 22. The injection of the still water injection agent 1 is performed using an injection machine. The injection machine puts the still water injection agent 1 at a high pressure (here, about 3).
It can be discharged at 5 MPa).

When the waterproof injection agent 1 is injected into the hole 22 at a high pressure, as shown in FIG. 2, the waterproof injection agent 1 gradually fills the hole 22 and gradually cracks (void 210) through the hole 22. Filled. At this time, since the groundwater 4 is infiltrated into the crack (void 210) and the hole 22, since
The still water injection agent 1 comes into contact with water.

As shown in FIG. 3, the still water injection agent 1 reacts with water to foam and harden. The hardened waterproof injection agent 1 (that is, the grout material 10) fills the cracks (voids 210) and the holes 22 and blocks the infiltration of water, so that the concrete structure 2 is flooded and the concrete structure 2 is used. Can prevent water leakage.

After the second step, the injector is removed from the hole 22, and as shown in FIG. 3, the portion of the hole 22 where the grout material 10 is not filled is filled with the filler 3. This completes the repair.

By the way, in the soil 6, the groundwater 4 and the soil water 5 located on the surface side of the groundwater 4 are included.
There is. Groundwater 4 means a state in which water is saturated in soil 6, and soil water 5 means a state in which water is unsaturated in soil 6. Generally, the water level (groundwater level) of the boundary surface 41 between the soil water 5 and the groundwater 4 changes depending on, for example, the amount of rainfall, the tide level, and the like.

At this time, if the groundwater level remains lower than the leak point 21 (specifically, the opening of the crack appearing on the surface 24) on the surface 24 of the concrete structure 2 in contact with the groundwater 4 for a long period of time (for example, FIG. 3) Since the grout material 10 dries, the grout material 10 tends to shrink.

However, according to the water blocking injection agent 1 according to the present embodiment, since a plurality of fine aggregates are dispersed and contained, the grout material 10 having a uniform and relatively high density can be obtained, and the grout material 10 can be obtained conventionally. Compared with the grout material 10 of the above, shrinkage due to drying can be suppressed. Therefore, it is possible to suppress the formation of a gap due to the shrinkage of the grout material 10 at the interface between the inner surface of the void 210 such as a crack and the grout material 10, and effective repair can be performed.

(2) Modifications The above embodiment is only one of the various embodiments of the present disclosure. The embodiment can be variously changed according to the design and the like as long as the object of the present disclosure can be achieved. Hereinafter, modified examples of the embodiments are listed. The modifications described below can be applied in combination as appropriate.

The water-stopping injection agent 1 according to the present disclosure is, for example, a normal foam stabilizer, a colorant (dye, pigment), a plasticizer, a filler, a flame retardant, and an aging agent, in addition to a plurality of fine aggregates and powder polymers. An appropriate amount of additive components such as an inhibitor and an antioxidant may be contained.

The water blocking injection agent 1 according to the above embodiment was used as a method for repairing water leakage in the concrete structure 2, but the usage of the water blocking injection agent 1 according to the present disclosure is not limited to the water leakage repair method, for example. It may be used for repairing concrete buildings.

(3) Examples The present invention will be described in more detail below with reference to Examples. However, the waterproof injection agent 1 according to the present disclosure
Is not limited to the following examples.

(3.1) Test 1
In Test 1, the following materials (Examples 1 to 6 and Comparative Examples 1 and 2) were used.

(3.1.1) Sample (3.1.1.1) Example 1
As a sample according to Example 1, a polyurethane composition (hydrophilic polyurethane) was used as a main component, and a plurality of fine aggregates and powder polymers were mixed with the polyurethane composition and stirred to obtain a waterproof injection agent. .. Details of the polyurethane composition, fine aggregate and powder polymer are as follows.
-Polyurethane composition: Hydrophilic polyurethane injection (product name: TAP grout injection, T
A120X, Manufacturer: Chaya Sangyo Co., Ltd.
-Fine aggregate: Average particle diameter: 28 μm, particle shape: spherical, material: acrylic resin, type: soft organic fine particles (product name: GM-2801, manufacturer: Aica Kogyo Co., Ltd.)
・ Powder polymer: Product name: Sumikaflex, Manufacturer: Sumika Chemtex Co., Ltd.
As a sample formulation, 10 parts by weight of the powder polymer and 15 parts by weight of the fine aggregate were added to 100 parts by weight of the polyurethane composition.

(3.1.1.2) Example 2
As a sample according to Example 2, a polyurethane composition (hydrophilic polyurethane) was used as a main component, and a plurality of fine aggregates and powder polymers were mixed with the polyurethane composition and stirred to obtain a waterproof injection agent. .. Details of the polyurethane composition, fine aggregate and powder polymer are as follows.
-Polyurethane composition: Hydrophilic polyurethane injection (product name: TAP grout injection, T
A120X, Manufacturer: Chaya Sangyo Co., Ltd.
-Fine aggregate: Average particle diameter: 28 μm, particle shape: spherical, material: acrylic resin, type: hard organic fine particles (product name: GB-28, manufacturer: Aica Kogyo Co., Ltd.)
・ Powder polymer: Product name: Sumikaflex, Manufacturer: Sumika Chemtex Co., Ltd.
As a sample formulation, 10 parts by weight of the powder polymer and 15 parts by weight of the fine aggregate were added to 100 parts by weight of the polyurethane composition.

(3.1.1.13) Example 3
As a sample according to Example 3, a polyurethane composition (hydrophilic polyurethane) was used as a main component, and a plurality of fine aggregates and powder polymers were mixed with the polyurethane composition and stirred to obtain a waterproof injection agent. .. Details of the polyurethane composition, fine aggregate and powder polymer are as follows.
-Polyurethane composition: Hydrophilic polyurethane injection (product name: TAP grout injection, T
A120X, Manufacturer: Chaya Sangyo Co., Ltd.
-Fine aggregate: Average particle diameter: 20 μm, particle shape: spherical, material: polyurethane, organic fine particles (product name: GU-2000P, manufacturer: Aica Kogyo Co., Ltd.)
・ Powder polymer: Product name: Sumikaflex, Manufacturer: Sumika Chemtex Co., Ltd.
As a sample formulation, 10 parts by weight of the powder polymer and 15 parts by weight of the fine aggregate were added to 100 parts by weight of the polyurethane composition.

(3.1.1.4) Example 4
As a sample according to Example 4, a polyurethane composition (hydrophilic polyurethane) was used as a main component, and a plurality of fine aggregates and powder polymers were mixed with the polyurethane composition and stirred to obtain a waterproof injection agent. .. Details of the polyurethane composition, fine aggregate and powder polymer are as follows.
-Polyurethane composition: Hydrophilic polyurethane injection (product name: TAP grout injection, T
A120X, Manufacturer: Chaya Sangyo Co., Ltd.
-Fine aggregate: Average particle diameter: 28 μm, Particle shape: Spherical, Material: Microcrosslinked acrylic, Type:
Organic fine particles consisting of microcrosslinks (Product name: GM-3049L, Manufacturer: Aica Kogyo Co., Ltd.)
・ Powder polymer: Product name: Sumikaflex, Manufacturer: Sumika Chemtex Co., Ltd.
As a sample formulation, 10 parts by weight of the powder polymer and 15 parts by weight of the fine aggregate were added to 100 parts by weight of the polyurethane composition.

(3.1.1.5) Example 5
As a sample according to Example 5, a polyurethane composition (hydrophilic polyurethane) was used as a main component, and a plurality of fine aggregates and powder polymers were mixed with the polyurethane composition and stirred to obtain a waterproof injection agent. .. Details of the polyurethane composition, fine aggregate and powder polymer are as follows.
-Polyurethane composition: Hydrophilic polyurethane injection (product name: TAP grout injection, T
A120X, Manufacturer: Chaya Sangyo Co., Ltd.
-Fine aggregate: Average particle diameter: 10 μm, particle shape: spherical, material: acrylic resin, type: porous organic fine particles (product name: GM-1005-17, manufacturer: Aica Kogyo)
stock))
・ Powder polymer: Product name: Sumikaflex, Manufacturer: Sumika Chemtex Co., Ltd.
As a sample formulation, 10 parts by weight of the powder polymer and 15 parts by weight of the fine aggregate were added to 100 parts by weight of the polyurethane composition.

(3.1.1.6) Example 6
As a sample according to Example 6, a polyurethane composition (hydrophilic polyurethane) was used as a main component, and a plurality of fine aggregates and powder polymers were mixed with the polyurethane composition and stirred to obtain a waterproof injection agent. .. Details of the polyurethane composition, fine aggregate and powder polymer are as follows.
-Polyurethane composition: Hydrophilic polyurethane injection (product name: TAP grout injection, T
A120X, Manufacturer: Chaya Sangyo Co., Ltd.
-Fine aggregate: Average particle diameter: 8 μm, particle shape: spherical, material: acrylic resin, type: organic fine particles consisting of a two-layer structure consisting of a core layer and a surface layer (product name: GBM-55-SF,
Manufacturer: Aica Kogyo Co., Ltd.
・ Powder polymer: Product name: Sumikaflex, Manufacturer: Sumika Chemtex Co., Ltd.
As a sample formulation, 10 parts by weight of the powder polymer and 15 parts by weight of the fine aggregate were added to 100 parts by weight of the polyurethane composition.

(3.1.1.7) Comparative Example 1
As a sample according to Comparative Example 1, a polyurethane composition (hydrophilic polyurethane) was used as a main component, and a powder polymer was mixed with the polyurethane composition and stirred to obtain a waterproof injection agent. Details of the polyurethane composition and the powder polymer are as follows.
-Polyurethane composition: Hydrophilic polyurethane injection (product name: TAP grout injection, T
A120X, Manufacturer: Chaya Sangyo Co., Ltd.
・ Powder polymer: Product name: Sumikaflex, Manufacturer: Sumika Chemtex Co., Ltd.
As a sample formulation, 10 parts by weight of the powder polymer was added to 100 parts by weight of the polyurethane composition.

(3.1.1.8) Comparative Example 2
As the sample according to Comparative Example 2, only the polyurethane composition (hydrophilic polyurethane) was used, and no additives were mixed. The polyurethane composition is the same as in Examples 1 to 6 and Comparative Example 1.
A hydrophilic polyurethane injection agent (product name: TAP grout injection liquid, TA120X, manufacturer and distributor: Chatani Sangyo Co., Ltd.) was used.

Table 1 shows Examples 1 to 6 and Comparative Examples 1 and 2.

(3.1.2) Shrinkage test A shrinkage test was performed using Examples 1 to 6 and Comparative Examples 1 and 2. In the shrinkage test, each sample was left under the following conditions.

For the 1st to 7th days, each sample was allowed to stand under wet conditions. As a wet condition, each sample was immersed in a container containing water, and each sample was left in water. This injects the still water injection agent 1 into the hole 22 (
(See Fig. 2), it is assumed that it will foam and cure.
For the 8th to 40th days, each sample was left in a closed container at room temperature of 24 ° C. and humidity of 25% RH. This assumes that the grout material 10 is located below the groundwater level and is in a wet state.
After the 40th day, each sample was left in the air at room temperature of 24 ° C. and humidity of 25% RH.
This assumes that the grout material 10 is at a position higher than the groundwater level and is in a dry state.

For each sample, the dimension in the length direction, the dimension in the width direction, and the thickness dimension of the sample were measured. Then, from these dimensions, the ratio of the surface area to the initial value (sometimes referred to as "area ratio") and the ratio of the volume to the initial value (sometimes referred to as "volume ratio") were calculated. The results are shown in Figures 4-7.
Shown in. In each graph, the horizontal axis is the material age (day), and the vertical axis is the value representing the ratio to the initial value as a percentage.

FIG. 4 shows the area ratio of 7 to 43 days of age. The "area ratio" here is 7
The ratio of the area to the initial value is shown with the area of the surface of the sample on the day as the initial value. FIG. 5 is an enlarged view of the period X1 (that is, the 40th to 43rd days of the material age) in FIG.

FIG. 6 shows the volume fraction of the material ages from 7 days to 43 days. The "volume fraction" here is 7
The ratio of the volume to the initial value is shown with the volume of the sample on the day as the initial value. FIG. 7 is FIG.
It is an enlarged view of the period X2 (that is, the 40th day to the 43rd day of the material age) in.

As shown in FIGS. 4 to 7, Examples 1 to 6 have a larger area ratio and volume ratio than Comparative Examples 1 and 2. In particular, the difference in area ratio and volume fraction after a certain period of time is remarkable. From this,
Examples 1 to 6 have a smaller shrinkage rate than Comparative Examples 1 and 2, especially after a certain period of time.
It was found that the contraction was more suppressed.

(3.1.3) Tensile test Tensile tests were conducted under the following conditions for Examples 3 to 6 and Comparative Example 2.

After preparing the samples of Examples 3 to 6 and Comparative Example 2, they were left in water for 7 days, and then 23 ± 2 ° C.
, 50 ± 10% RH under aerial conditions for 7 days. After that, Examples 3 to 6 and Comparative Example 2
The sample of No. 3 was punched to prepare a test piece formed into a dumbbell-shaped No. 3 shape conforming to JIS K 6251. Three samples were prepared for each sample as test pieces. 23 ± 2 ° C,
The test piece was allowed to stand for 24 hours under aerial conditions of 50 ± 10% RH, and then a tensile test was carried out.

The test conditions were a test room temperature of 23 ° C. and a test speed of 500 mm / min. For the testing machine, a dual column desktop universal test system 5969 (manufactured by Instron) automatic contact type extensometer AutoX 750 (manufactured by Instron) and a testing machine capacity: load cell type 1 kN were used.

The results are shown in Table 2.

As can be seen from Table 2, the values of the tensile strength and the value of the elongation at the time of cutting of Examples 3 to 6 are larger than those of Comparative Example 2. From this, it was found that when the powder polymer and the fine aggregate were added to the polyurethane composition "TAP grout injection solution, TA120X", the tensile strength became stronger.

(3.2) Test 2
In Test 2, the following materials (Examples 10 to 19 and Comparative Examples 10 and 11) were used.

(3.2.1) Sample (3.2.1.1) Example 10
As a sample according to Example 10, a polyurethane composition (hydrophilic polyurethane) was used as a main component, and a plurality of fine aggregates and powder polymers were mixed with the polyurethane composition and stirred to obtain a waterproof injection agent. .. Details of the polyurethane composition, fine aggregate and powder polymer are as follows.
-Polyurethane composition: One-component polyurethane injection (Product name: UG-I grout, Manufacturer: Osaka Waterproof Construction Co., Ltd.)
-Fine aggregate: average particle diameter: 28 μm, particle shape: spherical, material: polymethyl methacrylate (
PMMA), Type: Hard organic fine particles / powder polymer: Product name: Sumikaflex, Manufacturer: Sumika Chemtex Co., Ltd.
As a sample formulation, 10 parts by weight of the powder polymer and 15 parts by weight of the fine aggregate were added to 100 parts by weight of the polyurethane composition.

(3.2.1.2) Example 11
As a sample according to Example 11, a polyurethane composition (hydrophilic polyurethane) was used as a main component, and a plurality of fine aggregates and powder polymers were mixed with the polyurethane composition and stirred to obtain a waterproof injection agent. .. Details of the polyurethane composition, fine aggregate and powder polymer are as follows.
-Polyurethane composition: One-component polyurethane injection (Product name: UG-I grout, Manufacturer: Osaka Waterproof Construction Co., Ltd.)
-Fine aggregate: average particle diameter: 28 μm, particle shape: spherical, material: butyl polymethacrylate (
PBMA), Type: Soft organic fine particles / powder polymer: Product name: Sumikaflex, Manufacturer: Sumika Chemtex Co., Ltd.
As a sample formulation, 10 parts by weight of the powder polymer and 15 parts by weight of the fine aggregate were added to 100 parts by weight of the polyurethane composition.

(3.2.1.3) Example 12
As a sample according to Example 12, a polyurethane composition (hydrophilic polyurethane) was used as a main component, and a plurality of fine aggregates and powder polymers were mixed with the polyurethane composition and stirred to obtain a waterproof injection agent. .. Details of the polyurethane composition, fine aggregate and powder polymer are as follows.
-Polyurethane composition: One-component polyurethane injection (Product name: UG-I grout, Manufacturer: Osaka Waterproof Construction Co., Ltd.)
-Fine aggregate: Average particle diameter: 20 μm, Particle shape: Spherical, Material: Polyurethane, Type: Soft organic fine particles-Powder polymer: Product name: Sumikaflex, Manufacturer: Sumika Chemtex Co., Ltd.
As a sample formulation, 10 parts by weight of the powder polymer and 15 parts by weight of the fine aggregate were added to 100 parts by weight of the polyurethane composition.

(3.2.1.4) Example 13
As a sample according to Example 13, a polyurethane composition (hydrophilic polyurethane) was used as a main component, and a plurality of fine aggregates and powder polymers were mixed with the polyurethane composition and stirred to obtain a waterproof injection agent. .. Details of the polyurethane composition, fine aggregate and powder polymer are as follows.
-Polyurethane composition: One-component polyurethane injection (Product name: UG-I grout, Manufacturer: Osaka Waterproof Construction Co., Ltd.)
-Fine aggregate: Average particle size: 28 μm, Particle shape: Spherical, Material: Acrylic, Type: Organic fine particles consisting of microcrosslinks-Powder polymer: Product name: Sumikaflex, Manufacturer: Sumika Chemtex Co., Ltd.
As a sample formulation, 10 parts by weight of the powder polymer and 15 parts by weight of the fine aggregate were added to 100 parts by weight of the polyurethane composition.

(3.2.1.5) Example 14
As a sample according to Example 14, a polyurethane composition (hydrophilic polyurethane) was used as a main component, and a plurality of fine aggregates and powder polymers were mixed with the polyurethane composition and stirred to obtain a waterproof injection agent. .. Details of the polyurethane composition, fine aggregate and powder polymer are as follows.
-Polyurethane composition: One-component polyurethane injection (Product name: UG-I grout, Manufacturer: Osaka Waterproof Construction Co., Ltd.)
-Fine aggregate: Average particle diameter: 10 μm, Particle shape: Spherical, Material: Acrylic, Type: Porous organic fine particles-Powder polymer: Product name: Sumikaflex, Manufacturer: Sumika Chemtex Co., Ltd.
As a sample formulation, 10 parts by weight of the powder polymer and 15 parts by weight of the fine aggregate were added to 100 parts by weight of the polyurethane composition.

(3.2.1.6) Example 15
As a sample according to Example 15, a polyurethane composition (hydrophilic polyurethane) was used as a main component, and a plurality of fine aggregates and powder polymers were mixed with the polyurethane composition and stirred to obtain a waterproof injection agent. .. Details of the polyurethane composition, fine aggregate and powder polymer are as follows.
-Polyurethane composition: One-component polyurethane injection (Product name: UG-I grout, Manufacturer: Osaka Waterproof Construction Co., Ltd.)
-Fine aggregate: Average particle diameter: 8 μm, Particle shape: Spherical, Material: Acrylic, Type: Organic fine particles with a two-layer structure consisting of a core layer and a surface layer-Powder polymer: Product name: Sumikaflex, manufactured and sold Original: Sumika Chemtex Co., Ltd.
As a sample formulation, 10 parts by weight of the powder polymer and 15 parts by weight of the fine aggregate were added to 100 parts by weight of the polyurethane composition.

(3.2.1.7) Example 16
As a sample according to Example 16, a polyurethane composition (hydrophilic polyurethane) was used as a main component, and a plurality of fine aggregates and powder polymers were mixed with the polyurethane composition and stirred to obtain a waterproof injection agent. .. Details of the polyurethane composition, fine aggregate and powder polymer are as follows.
-Polyurethane composition: One-component polyurethane injection (Product name: UG-I grout, Manufacturer: Osaka Waterproof Construction Co., Ltd.)
-Fine aggregate: Average particle diameter: 4.5 μm, Particle shape: Spherical, Material: Silicon, Type: Hard organic fine particles-Powder polymer: Product name: Sumikaflex, Manufacturer: Sumika Chemtex Co., Ltd.
As a sample formulation, 10 parts by weight of the powder polymer and 15 parts by weight of the fine aggregate were added to 100 parts by weight of the polyurethane composition.

(3.2.1.8) Example 17
As a sample according to Example 17, a polyurethane composition (hydrophilic polyurethane) was used as a main component, and a plurality of fine aggregates and powder polymers were mixed with the polyurethane composition and stirred to obtain a waterproof injection agent. .. Details of the polyurethane composition, fine aggregate and powder polymer are as follows.
-Polyurethane composition: One-component polyurethane injection (Product name: UG-I grout, Manufacturer: Osaka Waterproof Construction Co., Ltd.)
-Fine aggregate: Average particle diameter: 0.5 μm, Particle shape: Spherical, Material: Acrylic, Type: Organic fine particles with a two-layer structure consisting of a core layer and a surface layer-Powder polymer: Product name: Sumikaflex, Manufacturer: Sumika Chemtex Co., Ltd.
As a sample formulation, 10 parts by weight of the powder polymer and 15 parts by weight of the fine aggregate were added to 100 parts by weight of the polyurethane composition.

(3.2.1.9) Example 18
As a sample according to Example 18, a polyurethane composition (hydrophilic polyurethane) was used as a main component, and a plurality of fine aggregates and powder polymers were mixed with the polyurethane composition and stirred to obtain a waterproof injection agent. .. Details of the polyurethane composition, fine aggregate and powder polymer are as follows.
-Polyurethane composition: One-component polyurethane injection (Product name: UG-I grout, Manufacturer: Osaka Waterproof Construction Co., Ltd.)
-Fine aggregate: average particle diameter: 40 μm, particle shape: spherical, material: polymethyl methacrylate (
PMMA), Type: Hard organic fine particles / powder polymer: Product name: Sumikaflex, Manufacturer: Sumika Chemtex Co., Ltd.
As a sample formulation, 10 parts by weight of the powder polymer and 15 parts by weight of the fine aggregate were added to 100 parts by weight of the polyurethane composition.

(2.2.1.10) Example 19
As a sample according to Example 19, a polyurethane composition (hydrophilic polyurethane) was used as a main component, and a plurality of fine aggregates and powder polymers were mixed with the polyurethane composition and stirred to obtain a waterproof injection agent. .. Details of the polyurethane composition, fine aggregate and powder polymer are as follows.
-Polyurethane composition: One-component polyurethane injection (Product name: UG-I grout, Manufacturer: Osaka Waterproof Construction Co., Ltd.)
-Fine aggregate: average particle diameter: 85 μm, particle shape: spherical, material: polymethyl methacrylate (
PMMA), Type: Hard organic fine particles / powder polymer: Product name: Sumikaflex, Manufacturer: Sumika Chemtex Co., Ltd.
As a sample formulation, 10 parts by weight of the powder polymer and 15 parts by weight of the fine aggregate were added to 100 parts by weight of the polyurethane composition.

(3.2.1.11) Comparative Example 10
As a sample according to Comparative Example 10, a polyurethane composition (hydrophilic polyurethane) was used as a main component, and a powder polymer was mixed with the polyurethane composition and stirred to obtain a waterproof injection agent. Details of the polyurethane composition and the powder polymer are as follows.
-Polyurethane composition: One-component polyurethane injection (Product name: UG-I grout, Manufacturer: Osaka Waterproof Construction Co., Ltd.)
・ Powder polymer: Product name: Sumikaflex, Manufacturer: Sumika Chemtex Co., Ltd.
As a sample formulation, 10 parts by weight of the powder polymer was added to 100 parts by weight of the polyurethane composition.

(3.2.1.12) Comparative Example 11
As the sample according to Comparative Example 11, only the polyurethane composition (hydrophilic polyurethane) was used.
No additives were mixed. As the polyurethane composition, Examples 10 to 19 and Comparative Example 10
The same as above, a one-component polyurethane injection agent (product name: UG-I grout, manufacturer and distributor: Osaka Waterproof Construction Co., Ltd.) was used.

Table 3 shows Examples 10 to 19 and Comparative Examples 10 and 11.

(3.2.2) Shrinkage test A shrinkage test was performed using Examples 10 to 19 and Comparative Examples 10 and 11. In the shrinkage test
As shown in FIG. 8, each sample was marked with a measurement point (dot mark in FIG. 8), and then each sample was left under the following conditions.

For the 1st to 7th days, each sample was allowed to stand under wet conditions. As a wet condition, each sample was wrapped in a wet cloth and stored in a box-shaped container.
On the 8th to 35th days, each sample was allowed to stand under aerial conditions of room temperature 23 ° C. ± 2 ° C. and humidity 50 ± 10% RH.

For each sample, on the 3rd, 7th, 9th, 12th, 14th, 16th, 21st, 28th, and 35th days, the dimension L in the length direction of the measurement point. , The dimension W in the width direction of the measurement point and the thickness dimension of the sample were measured.

For the measurement, for the measurement of the dimension L in the length direction and the dimension W in the width direction, the digital caliper (
CD-60C and CD-20APX (manufactured by Mitutoyo Co., Ltd.) are used, and the thickness dimension is
A forum rubber precision thickness measuring machine was used.

From these measurement results, the ratio of surface area to the initial value (sometimes called "area ratio"),
The ratio of volume to the initial value (sometimes referred to as "volume fraction") and the ratio of the thickness dimension to the initial value (sometimes referred to as "thickness ratio") were calculated. The results are shown in FIGS. 9 to 11. In each graph, the horizontal axis is the material age (day), and the vertical axis is the value representing the ratio to the initial value as a percentage.

As can be seen from FIGS. 9 to 11, after about 26 days of age, Examples 10 to 19 have a surface area ratio to an initial value, a volume ratio to an initial value, and an initial value as compared with Comparative Examples 10 and 11. The ratio of thickness to value is large. That is, it was found that in the samples according to Examples 10 to 19, the rate of change in surface area, volume and thickness can be suppressed as compared with Comparative Examples 10 and 11 after a certain period of time.

(3.2.3) Tensile test Using the samples of Example 10 and Comparative Example 11, a tensile test was performed under the following conditions.

The samples of Example 10 and Comparative Example 11 were punched to prepare dumbbell-shaped No. 3 test pieces conforming to JIS K 6251. Three samples were prepared for each sample as test pieces. The test piece was allowed to stand for 24 hours under aerial conditions of 23 ± 2 ° C. and 50 ± 10% RH, and then a tensile test was carried out.

The test conditions were a test room temperature of 23 ° C. and a test speed of 500 mm / min. For the testing machine, a dual column desktop universal test system 5969 (manufactured by Instron) automatic contact type extensometer AutoX 750 (manufactured by Instron) and a testing machine capacity: load cell type 1 kN were used.

The results are shown in Table 4.

As can be seen from Table 4, a comparison between Example 10 in which the powder polymer and the fine aggregate were added to the polyurethane composition "UG-I grout" and only the polyurethane composition "UG-I grout". There is not much difference in the numerical values from Example 11. Therefore, even if the powder polymer and the fine aggregate are added to the polyurethane composition "UG-I grout",
It was found that the tensile strength and elongation rate were not reduced.

(3.2.3) Adhesion strength test Using the samples of Example 10 and Comparative Example 11, an adhesion strength test was conducted under the following conditions.

The samples of Example 10 and Comparative Example 11 were used as concrete flat plates (W300 mm × L), respectively.
It is applied to the surface of 300 mm × t40 mm to a thickness of 2 mm and allowed to stand. For each concrete flat plate, leave it in water at 20 ° C for the 1st to 4th days, and 20 ° C, 30% R for the 5th to 11th days.
It was allowed to stand under the air condition of H, and then the adhesion strength test was carried out. As a testing machine, a Kenken type tensile testing machine (TechnoStar R-10000ND manufactured by Sanko Techno Co., Ltd.) was used, and the adhesion strength test was performed at any four places on the coated surface of the concrete flat plate. The adhesion strength test was conducted in accordance with the JSCE standard JSCE-K531.

The results are shown in Table 5.

As can be seen from Table 5, Example 10 has a larger axial tensile force and adhesive strength than Comparative Example 11. From this, it was found that the waterproof injection agent in which the powder polymer and the fine aggregate were added to the polyurethane composition had stronger adhesion to concrete than the waterproof injection agent containing only the polyurethane composition.

1 Water stop injection agent 2 Concrete structure 21 Leakage point 210 Void 22 Hole 23 Structure surface 24 Structure surface 3 Filler 4 Groundwater 5 Soil water 6 Soil

Claims (4)

It is a waterproof injection agent that is injected into a hole leading to the leaked part when repairing a leaked part that occurs at a part of the concrete structure that comes into contact with groundwater.
Containing a polyurethane composition as a main component,
Disperses and contains multiple fine aggregates made of polyurethane ,
Water stop injection. It is a waterproof injection agent that is injected into a hole leading to the leaked part when repairing a leaked part that occurs at a part of the concrete structure that comes into contact with groundwater.
Containing a polyurethane composition as a main component,
Disperses and contains multiple fine aggregates made of silicone resin,
Water stop injection. Further comprising a powder polymer composed of an ethylene-vinyl acetate copolymer resin-based powder or a polyacrylic acid ester resin-based powder.
The waterproof injection according to claim 1 or 2. The plurality of fine aggregates are fine particles having an average particle diameter of 0.3 μm or more and 85 μm or less.
The water-stopping injection agent according to any one of claims 1 to 3.

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