JP2015074564A - Permeation type crushing agent and concrete repair method using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide: a crushing agent capable of crushing and removing a deteriorated portion alone without damaging to a sound portion, hardly causing noise, vibration, dust, and the like with less labor, without requiring a step of making a hole to be filled with a crushing agent; and a concrete repair method using the same.SOLUTION: A permeation type crushing agent 3 includes: 100 parts by weight of a crushing agent; 0.5 to 1.25 parts by weight of a high-performance concrete water-reducing agent; and 25 to 35 parts by weight of water. The crushing agent has a fineness of 3000 to 7000 cm/g based on a Blaine specific surface area, and a flow value of 250 to 300 mm. The concrete repair method includes: a permeation step of allowing the permeation type crushing agent 3 to permeate a crack 2 in a concrete structure 1 having cracks due to deterioration; a crushing step of curing the concrete structure 1 and crushing a deteriorated concrete portion; and a removal step of removing the deteriorated concrete portion crushed in the crushing step.

Description

  The present invention relates to crushing of concrete structures, and more particularly, to an osmotic crushing agent and a concrete repair method using the same.

  Concrete structures gradually deteriorate from the surface due to freeze-thaw action, neutralization action, ingress of chloride ions, etc., and the structure becomes brittle or cracks occur. Repair and reinforcement of the deteriorated concrete part is performed by removing the deteriorated part and placing concrete again. The removal of the deteriorated portion requires a sound removal of the deteriorated portion in order to bring out a sound concrete surface on the surface. Commonly used removal methods include removal with a chisel, removal with a conventional static crushing agent, removal with a water jet, and the like.

  The removal with a chisel is to destroy and remove the deteriorated portion by impact with an electric pick, an air chipper or the like. The conventional static crushing agent is removed by drilling a cylindrical hole with a diameter of about 25-40 mm with a drill or the like in the deteriorated part, filling the hole with a slurry crushing agent, and expanding the crushing agent when it is cured. Concrete is crushed and removed. For example, in Patent Document 1, in a destructive method in which a crack is generated in a concrete structure by an expansion pressure generated by a hydration reaction of the expanded crushed material, a slurry of a specific expanded crushed material is placed in a filling hole opened in the concrete structure. The filling method of the expanded crushing material to be filled is described. The removal by the water jet is a method in which a strong water flow is jetted to the deteriorated portion, and only the deteriorated portion is selectively blown away without damaging the healthy portion.

JP 60-85163 A

  However, although removal with a chisel can be performed with relatively small equipment, noise, vibration, dust and the like are generated, and labor is required. Moreover, there is a risk of damaging the healthy part due to the impact when removing the deteriorated part. In addition, the removal using the conventional static crushing agent has a bad influence such as causing cracks around the portion to be removed because pressure is applied in all directions of the hole. In addition, the degree of cracks in the concrete cannot be determined from the appearance, so it is necessary to examine the concrete structure by drilling it. In such a case, there is a fear that the deteriorated portion is not sufficiently removed. Moreover, since removal by a water jet requires a large-scale injection machine facility and large electric power, it is not suitable for removing a deteriorated portion of a small cross section. Also, the construction cost is expensive.

  The present invention has been made in view of the above points, and the problem is that noise, vibration, dust and the like are less likely to occur, less labor is required, and a step of opening a hole for filling the crushing agent is unnecessary, and the healthy part is It is an object of the present invention to provide a crushing agent capable of crushing and removing only a deteriorated portion without damage and using a simple tool at a low cost, and a concrete repair method using the crushing agent.

  The present inventor has intensively studied to solve the above-mentioned problems, and by infiltrating the expandable static crushing agent having increased permeability into cracks existing in the deteriorated portion of the concrete, the hole filling the crushing agent is formed. It was found that only the deteriorated part can be crushed without opening. The present inventor has further studied and has completed the present invention.

That is, the present invention includes the following aspects.
(1) Contains crushing agent, concrete high-performance water reducing agent, and water,
The content ratio of the concrete high-performance water reducing agent is 0.5 to 1.25 parts by weight with respect to 100 parts by weight of the crushing agent,
The water content is 25 to 35 parts by weight with respect to 100 parts by weight of the crushing agent,
The fineness of the crushing agent is 3000 to 7000 cm ² / g in terms of Blaine specific surface area, and
An osmotic crushing agent characterized by having a flow value of 250 to 300 mm.
(2) The osmotic crushing agent according to (1), wherein the concrete high-performance water reducing agent is melflux.
(3) A permeation step in which the permeation type crushing agent according to (1) or (2) is permeated into cracks of a concrete structure that has deteriorated and cracked; A concrete repairing method comprising a crushing step of crushing, and a removing step of removing a concrete deteriorated portion crushed in the crushing step.
(4) The water stop layer forming step of forming a water stop layer on at least a part of the surface of the concrete structure that has deteriorated and cracked before the infiltration step is characterized in that (3) The concrete repair method described in).
(5) A permeation step of permeating the porous crushing agent according to (1) or (2) into the porous structure of a concrete structure having a porous concrete portion; curing the concrete structure to crush the porous concrete portion A concrete repairing method comprising a crushing step and a removing step of removing the porous concrete portion crushed in the crushing step.
(6) A permeation step in which the permeation type crushing agent according to (1) or (2) is permeated into the voids of a concrete structure having a junker portion having a gap, and the junker portion is cured by curing the concrete structure. A concrete repair method comprising a crushing step of crushing, and a removing step of removing a junker portion crushed in the crushing step.

  According to the osmotic crushing agent and the concrete repair method using the same of the present invention, noise, vibration, dust and the like are hardly generated, labor is small, a step of making a hole for filling the crushing agent is unnecessary, and a healthy part is removed. Only the deteriorated portion can be crushed and removed without damage, and construction can be performed at low cost using a simple tool.

The cross-sectional view which shows the one aspect | mode which permeate | transmits the penetration-type crushing agent of this invention to the crack of a concrete structure. The cross-sectional view which shows the other aspect which permeate | transmits the penetration-type crushing agent of this invention to the crack of a concrete structure. The cross-sectional view which shows the one aspect | mode which permeate | transmits the penetration-type crushing agent of this invention to the internal crack of a concrete structure. The graph which shows the expansion pressure in each water quantity of the osmotic type crushing agent of this invention. The graph which shows the expansion pressure in each temperature of the penetration type crushing agent of this invention.

  The present invention is described in detail below. The osmotic crushing agent of the present invention contains a crushing agent, a concrete high-performance water reducing agent, and water.

  In crushing with a conventional crushing agent, first, a plurality of cylindrical holes having a diameter of several centimeters are drilled in a concrete structure, and the crushing agent is injected and filled in the hole. Concrete is crushed by applying pressure from the bottom. On the other hand, the crushing with the osmotic crushing agent of the present invention does not require such a filling hole, but permeates the osmotic crushing agent into the crack of the concrete structure, and the crushing agent expands and the crack surface thereof. The concrete is crushed by spreading the crack surface into a planar shape by applying pressure from above.

  The crushing agent which concerns on this invention contains the expansible component which produces an expansion pressure in a hydration process like quick lime, for example. The crushing agent contains additives such as Portland cement and reaction retarding agent as necessary. Examples of commercially available crushing agents include Blister, Power Blister (manufactured by Taiheiyo Material Co., Ltd.), S Mite (manufactured by Sumitomo Osaka Cement Co., Ltd.), HP Rock Tone (manufactured by Kawai Lime Industry Co., Ltd.), and the like. These crushing agents are usually sold in powder form, and are used by the user mixing with water and pouring into perforations.

The fineness of the crushing agent according to the present invention is 3000 to 7000 cm ² / g in terms of Blaine specific surface area. Among them, fineness of the crushing agent according to the present invention, preferable to be 5000~7000cm ² / g in Blaine specific surface area, more preferable to be 5500~6000cm ² / g, when is 5600~6000cm ² / g, especially Preferably, it is 5700-5900 cm < ² > / g and most preferable. If the Blaine specific surface area of the crushing agent is larger than this lower limit, it is preferable in terms of the permeability of the osmotic crushing agent. Moreover, when the Blaine specific surface area of a crushing agent is smaller than this upper limit, it is preferable at the point of the fluidity | liquidity of an osmotic type crushing agent, and an expansion pressure. Furthermore, when the Blaine specific surface area of the crushing agent is within this range, the resistance to material separation such that the component crushing agent settles and the floating water is separated can be maintained in the slurry-like osmotic crushing agent of the present invention. Is preferable. Here, the Blaine specific surface area of the crushing agent is the sum of the surface areas of all particles in 1 g of the crushing agent expressed in cm ² and is measured by the Blane air permeation method according to JIS R 5201.

  Although the method for setting the fineness of the crushing agent to the above range is not particularly limited, for example, a commercially available powdered crushing agent can be pulverized for a desired time using a known crusher such as a ball mill.

  The concrete high-performance water reducing agent according to the present invention is a kind of concrete admixture for concrete, and is generally used to disperse cement particles, reduce the amount of water used, and increase the strength of concrete. JIS A 6204 Includes a high-performance water reducing agent (non-AE) and a high-performance AE water reducing agent (standard type, delayed type) defined based on quality such as water reduction rate. For example, the water reduction rate (%) is defined as 12 or more for high performance water reducing agents and 18 or more for high performance AE water reducing agents. In addition, high-performance water reducing agents (non-AE) are those in which the amount of air in the concrete using them does not exceed 1.0% of the amount of air in the standard concrete. It is stipulated that the amount of air in concrete using them does not differ by more than 0.5% relative to the amount of air in standard concrete plus 3.0%. When a concrete high-performance water reducing agent is used, a highly permeable penetrating crushing agent can be obtained even if the proportion of water is small. Among them, since the amount of air contained in the osmotic crushing agent of the present invention is small, the amount of active ingredient per volume is large, and since the force does not escape to the bubbles, the crushing force (expansion force) is high. Performance water reducing agents (non-AE) are preferred.

  Specifically, concrete high performance water reducing agents include oxycarboxylic acids, lignin sulfonic acids, polyoxyethylene alkyl allyl ether derivatives, aromatic sulfonic acids such as naphthalene sulfonic acid formalin condensate, polycarboxylic acids, melamine sulfonic acids, amino Those having sulfonic acid as a main component are listed. Especially, what has polycarboxylic acids as a main component is preferable. Moreover, these concrete high performance water reducing agents can be used 1 type or in combination of 2 or more types.

  Examples of commercially available concrete high performance water reducing agents include Melflux 2651F, Melflux 1641F (manufactured by BASF, polyether polycarboxylic acid), Melflux AP101F, Melflux VP101 (manufactured by BASF, modified polycarboxylic acid) ), Polycarboxylic acid-based high-performance water reducing agents such as Tupol (manufactured by Takemoto Yushi Co., Ltd., polycarboxylic acid copolymer), and naphthalenesulfonic acid-based high-performance water reducing agents such as Mighty 100 (manufactured by Kao Corporation). Among them, melflux is preferable in that a flow value described later can be set to 250 to 300 mm.

  In the osmotic crushing agent of the present invention, the concrete high-performance water reducing agent disperses the powdery pulverizing agent in water, thereby improving the fluidity and permeability of the osmotic crushing agent. Although the fluidity of the osmotic crushing agent tends to decrease as the particle size of the pulverizing agent decreases, the expansion pressure of the osmotic crushing agent is increased by adding a concrete high-performance water reducing agent, and the fluidity of the osmotic crushing agent is increased. And the permeability to fine cracks is improved.

  The content ratio of the concrete high-performance water reducing agent in the osmotic crushing agent of the present invention is 0.5 to 1.25 parts by weight with respect to 100 parts by weight of the crushing agent. Among them, the content ratio of the concrete high-performance water reducing agent in the osmotic crushing agent of the present invention is preferably 0.5 to 1.0 part by weight with respect to 100 parts by weight of the crushing agent, and 0.75 to 1.0 part by weight. Part is more preferable. When the content ratio of the concrete high-performance water reducing agent is larger than the lower limit of these ranges, the decrease in fluidity due to the reduction in the particle size of the crushing agent is improved, and the permeability is improved. If the content ratio of the concrete high-performance water reducing agent is less than the upper limit of these ranges, the material separation of the osmotic crushing agent is difficult to occur, the uniformity is easily maintained, and the pot life is long.

  As the water according to the present invention, natural water such as ground water, river water, and lake water, and tap water can be used. Water having a low content of organic and inorganic substances is preferable. The water content in the osmotic crushing agent of the present invention is 25 to 35 parts by weight with respect to 100 parts by weight of the crushing agent. Especially, the content rate of the water in the osmotic type crushing agent of the present invention is preferably 28 to 35 parts, more preferably 29 to 32 parts, and 30 parts to 31 parts with respect to 100 parts of the crushing agent. Particularly preferred. Water not only functions as a dispersion medium for the powdered crushing agent, but also reacts with quick lime, which is a component of the crushing agent, and CaO of Portland cement to produce crystalline calcium hydroxide, thereby generating an expansion pressure. When the amount of water is within this range, the expansion pressure of the osmotic crushing agent and the workability (fluidity and pot life) of crushing with the osmotic crushing agent are excellent.

(Other ingredients)
The penetration type crushing agent of this invention can contain another component in the range which does not impair the effect of this invention. Examples of other components include a retarder, an accelerator, an AE agent, a fluidizing agent, and an antifoaming agent.

  The retarder and accelerator can adjust the hydration reaction rate to ensure the pot life required for the work. Accelerators include inorganic salts such as calcium, sodium and potassium chlorides, nitrates and nitrites, and sulfur-containing compounds (sulfates, thiocyanates, etc.) for inorganic systems, and amines and organic acids for organic systems. Examples include calcium salt and sugar. As a retarder, it is used to adjust the hydration reaction rate of clinker and self-hardening substance to ensure the pot life required for work, such as sugar, potassium carbonate, sodium carbonate, citric acid, tartaric acid, Examples include sodium citrate, gluconate, and slaked lime.

  The osmotic crushing agent of the present invention is obtained by kneading a crushing agent, a concrete high-performance water reducing agent, water, and other components as necessary. The kneading method is not particularly limited, and can be kneaded by hand or mechanically. Usually, it is prepared immediately before using the osmotic crushing agent. The osmotic crushing agent of the present invention can be prepared with a simple kneading machine operating with, for example, a 100 V power supply, or an instrument such as a spoon or a cup.

  The osmotic crushing agent of the present invention has a flow value of 250 to 300 mm. Here, the flow value is a value measured at 20 ° C. according to JASS 15M-103 (quality standard for self-leveling material). When the flow value is smaller than 250 mm, the penetration type crushing agent of the present invention may not penetrate into cracks having a width of 0.3 to 2 mm in concrete. If the flow value exceeds 300 mm, the osmotic crushing agent of the present invention may cause material separation. The flow value of the osmotic crushing agent can be set within this range by adjusting the content of the concrete high-performance water reducing agent, for example. In order to set the flow value of the osmotic crushing agent within this range, the concrete high-performance water reducing agent is preferably Melflux. Usually, the flow value of the osmotic crushing agent gradually decreases after the preparation, but it is preferable in view of workability to maintain the flow value at 250 mm or more for 30 minutes.

  The concrete repairing method of the present invention includes a permeation process in which the permeation-type crushing agent is infiltrated into cracks in a concrete structure that has deteriorated and cracked, and a crushing process in which the concrete structure is cured to crush the concrete degradation part. And a removing step of removing the concrete deteriorated portion crushed in the crushing step.

  In the infiltration step, the infiltration type crushing agent is infiltrated into the cracks of the concrete structure that has deteriorated and cracked. The penetration type crushing agent of the present invention has high permeability, and can be penetrated to a minimum crack width of about 0.3 mm by adjusting the fineness of the crushing agent and the content ratio of the concrete high-performance water reducing agent, for example.

  The infiltration method is not particularly limited, but when the deteriorated portion is the upper surface of the concrete structure, an osmotic crushing agent can be applied to the deteriorated portion. In addition, when the deteriorated portion is the side surface or the lower surface of the concrete structure, the concrete repairing method of the present invention stops water on at least a part of the surface of the concrete structure that has deteriorated and cracked before the infiltration process. A waterstop layer forming step of forming a layer can be included. In these cases, the penetration of the osmotic crushing agent into the cracks can be assisted by fine pressurization using a syringe or the like. Hereinafter, the penetration method will be described in more detail with reference to the drawings.

  FIG. 1 shows a cross section of a concrete structure 1 having a crack 2 on its upper surface. The penetration type crushing agent 3 of the present invention is poured onto the upper surface of the concrete structure 1 (solid arrow). Since the penetration type crushing agent 3 has high permeability to a narrow crack, it penetrates into the deep part of the crack 2 (dashed arrow). The penetration type crushing agent 3 can be filled in the crack 2 by pouring the penetration type crushing agent 3 until the penetration stops.

  FIG. 2 shows a cross-sectional view of a concrete structure 4 with cracks 5 on the side. Connected to the syringe 7 is an adapter 8 comprising a plate portion having a through-hole at the center and a tube portion connected at the center and having a cavity communicating with the through-hole. Syringe 7 and adapter 8 may be connected so that attachment or detachment is possible, and may be united. The water blocking layer 9 is formed by applying a known cement-based water blocking material or the like to the side surface of the concrete structure 4 and solidifying it. The water-stopping layer 9 can prevent the penetration-type crushing agent 6 from leaking from cracks other than the crack in which the penetration-type crushing agent 6 is injected. The water blocking layer 9 can be formed on the entire side surface of the concrete structure 4, but can also be formed only on the cracked portion of the surface.

  In the embodiment shown in FIG. 2, the plate portion of the adapter 8 is brought into close contact with the side surface of the concrete structure 4 and the proximal end of the tube portion of the adapter 8 (the right side in the drawing) protrudes above the plate portion (see FIG. 2). The right side) and the side surface of the concrete structure 4 are solidified by applying a cement-type waterstop material to form a waterstop layer 9. After the water blocking layer 9 is formed, the plunger of the syringe 7 filled with the osmotic crushing agent 6 is manually pushed slowly (solid line arrow), and the osmotic crushing agent 6 is infiltrated into the crack 5 (thick line arrow).

  FIG. 3 shows a cross-sectional view of a concrete structure 10 with a crack 11 that is not exposed on the outer surface. An adapter 14 similar to the adapter 8 in FIG. 2 is connected to the syringe 13. Further, a supply path 16 is opened in the concrete structure 10 so as to communicate with the through hole of the adapter 14. This delivery path is a flow path for feeding the permeable crushing agent 6 to the crack 11 inside the concrete structure 10. The diameter (width) of the delivery path 16 only needs to be able to penetrate the osmotic crushing agent according to the present invention, and can be, for example, less than 1 mm in diameter or less than 0.1 mm. The delivery path 16 has a different purpose and diameter from a hole having a diameter of several centimeters filled with a conventional crushing agent. That is, this delivery path 16 is not for filling the osmotic crushing agent 6 and applying an expansion pressure to the concrete structure 4. The water blocking layer 15 can be formed in the same manner as the water blocking layer 9. In this way, even if there are no cracks on the surface, the slurry-like osmotic crushing agent is injected (infiltrated) into the internal cracks and floats through the supply path 16 by fine pressurization, and diffused and filled. be able to.

  As described above, in the osmotic step, the osmotic crushing agent of the present invention can be injected by directly attaching an osmotic crushing agent supply means such as a syringe to a place where continuous cracks or voids appear on the table. Yes (Figure 3). Further, in the infiltration process, the osmotic crushing agent of the present invention has no continuous cracks on the surface, but in the locations where there are continuous cracks, voids, and floats, a supply path is further provided to the voids. Can be injected into the cracks (FIG. 4).

  In the concrete repairing method of the present invention, a cleaning step and / or a wetting step in the crack of the concrete structure can be performed before the infiltration step. The cleaning process is a process of removing particles and the like in the crack, and can be performed with a blower or a suction machine. When particles are removed in the crack, the filling property of the penetrating crushing agent into the crack is improved. The wetting step is a step in which water is injected into the crack to remove the pre-excess water to wet the crack surface. When the crack surface is wet, water absorption from the crack surface can be prevented when the osmotic crushing agent penetrates into the crack. Further, when the pre-excess water is removed in the wetting step, the osmotic crushing agent easily penetrates into the cracks. The pre-excess water can be removed with a blower or a suction machine.

In the crushing step, the concrete structure is cured to crush the deteriorated concrete portion. The curing time is appropriately selected depending on the temperature, the crushing agent used, etc., but is usually 10 hours. When the osmotic crushing agent contains calcium oxide (CaO) as a main component, the calcium oxide reacts with water to form colloidal calcium hydroxide (Ca (OH) ₂ ), and a bulky hexagonal plate crystal To produce expansion pressure. Inflation pressure is preferable to be 25 N / mm ² or more, and more preferably 30 N / mm ² or more. The time from the preparation of the osmotic crushing agent to the loss of fluidity (potential time) can be adjusted by selecting the crushing agent used for the preparation of the osmotic crushing agent and adding an accelerator or retarder. it can. The pot life is preferably 10 to 60 minutes, and more preferably 30 to 60 minutes.

  In the removing step, the concrete portion crushed in the crushing step is removed. According to the osmotic crushing agent of the present invention, where the osmotic crushing agent is filled, the destructive force is generated along the crack surface in the direction perpendicular to the crack surface, and the deteriorated portion is peeled off so as to float up. The deteriorated part can be removed without damaging the sound part of the concrete structure. Moreover, since the part which has not peeled exists in the state which the internal stress worked, secondary crushing is easy. For the secondary crushing, a breaker, nibra, or ripper can be used.

  The concrete repair method of the present invention is less prone to noise, vibration, dust and the like, and requires less labor. Moreover, the process of making a hole for injecting the crushing agent is unnecessary, and only the deteriorated portion can be crushed and removed without damaging the healthy portion. Furthermore, it is easy to prepare an osmotic crushing agent, and it can be permeated with a simple instrument such as a syringe for application or injection manually, and can be constructed at low cost.

  In the concrete repairing method of the present invention, after the removing step, concrete can be newly placed to restore the concrete structure.

  A porous concrete part may be provided on the surface or inside of a concrete structure for the purpose of water permeability or water retention. The porous (porous) concrete portion has a hole of about 0.5 to 0.8 mm, which is about 10 times larger than the voids of normal concrete. The penetration type crushing agent of this invention can be used for the selective removal of the porous concrete part of such a concrete structure. That is, porous concrete can be repaired by performing a permeation process that permeates the porous structure of the concrete structure having a porous concrete portion instead of the permeation process of the concrete repair method. Since the penetration type crushing agent of the present invention selectively permeates into the porous part of the porous concrete part, only the porous concrete part can be selectively crushed.

  When material separation occurs due to bleeding during the placement of concrete, the upper surface of the concrete structure may become a porous jumper. The penetration type crushing agent of this invention can be used for the selective removal of the junker part of such a concrete structure. That is, the junker portion can be repaired by performing a permeation step that permeates the gap in the junker portion of the concrete structure having the junker portion instead of the permeation step of the concrete repair method. Since the penetration type crushing agent of the present invention can adjust the permeability corresponding to the size of the porous void in the junker portion, only the junker portion can be selectively crushed by selectively permeating the junker portion.

(Example)
EXAMPLES The present invention will be specifically described below with reference to examples and comparative examples, but the present invention is not limited to these. In the following, “parts” and “%” mean “parts by weight” and “% by weight” unless otherwise specified. The fineness, fluidity, permeability, expansion pressure, and pot life in the examples and comparative examples were measured by the following methods.

(1) Fineness The fineness of the crushing agent is determined according to JIS R 5201 according to JIS R 5201 using a brane air permeation device (manufactured by Sanyo Tester Kogyo Co., Ltd., brane air permeation fineness meter). The surface area was measured. Assuming that the density of the sample did not change by grinding, the density of the sample was 3.22 g / cm ³ , and the porosity of the sample bed was 0.500 ± 0.005.
(2) Flowability The flow value was measured at 20 ° C. according to JASS 15M-103 (quality standard for self-leveling material).
(3) Permeability The lower end of two glass plates (length 400 mm, width 400 mm) was closed, and the upper end was made a gap of 0.5 mm. The sample was poured from the upper end, the distance between the deepest point where the sample penetrated and the lower end was measured, and the width of the gap at that position was calculated. It indicates that the narrower the gap at the deepest point, the higher the permeability of the sample to cracks in the concrete degradation part.
(4) Expansion pressure Automatic digital strain measuring instrument (manufactured by Tokyo Sokki Co., Ltd., FLA3-2LT-11) on the side surface of the central portion of a carbon steel pipe for pressure piping (JIS G 3454 SCH40 nominal diameter 20A) having a length of 40 cm with one end closed. ) Was pasted diagonally at two locations. An osmotic crushing agent is poured to the upper end of a carbon steel pipe for pressure piping immersed in a thermostatic water bath with the closed end down, and the amount of strain (μm) is measured with an automatic digital strain measuring instrument, and the expansion pressure P (N / Mm ² ) was obtained from the following equation derived from the compact cylinder theory.
P = {E / (2-υ)} × {r ₀ −r ₁ ² ) / r ₁ ² } × εθ
Here, Poisson's ratio (υ) of steel is 0.3, Young's modulus (E) of steel is 2.058 × 10 ⁵ , steel pipe outer diameter (r ₀ ) is 27.2 mm, and steel pipe inner diameter (r ₁ ) is 21. .4 mm, and the amount of strain (εθ) was the average value of the two gauges.
Incidentally, the inflation pressure of a conventional crushing agent is about 25 N / mm ^2. When such an expansion pressure is generated, the concrete can be crushed because the tensile strength of the concrete is about 1.5 to 3.025 N / mm ² .
(5) Usable time The time from when the permeable curing agent was produced by kneading the crushing agent and water until the fluidity of the osmotic curing agent disappeared was measured and used as the usable time. When the fluidity suddenly decreased immediately after kneading and the permeability was not obtained, the pot life was set to 0 minutes. Pot life affects workability.

(Example 1)
100 parts of commercially available static crushing agent S Mite SS (Sumitomo Osaka Cement Co., Ltd., fineness (Brain specific surface area; 3220 cm ² / g)) as a crushing agent, Melflux 2651F (made by BASF) as a concrete high performance water reducing agent , Polyether / polycarboxylic acid-based) at a ratio of 0.5 part and water at a ratio of 30 parts using a hand mixer to obtain a slurry-like penetrating agent E1. The characteristics of the osmotic crushing agent E1 were measured. The fluidity was 250 mm in flow value, and the permeability was 0.078 mm in the deepest point gap.

(Example 2)
S-Mite SS was crushed with a ball mill under the conditions of 4 kg powder and 40 g grinding medium for 30 minutes to obtain a crushing agent having a fineness of 4990 cm ² / g in terms of Blaine specific surface area. A slurry-like osmotic crushing agent E2 was obtained in the same manner as in Example 1 except that 100 parts of this crushing agent having a Blaine specific surface area of 4990 cm ² / g was used instead of S-Mite SS. The characteristics of osmotic crushing agent E2 were measured. The fluidity was 263 mm in flow value, and the permeability was 0.034 mm in the deepest point gap.

(Example 3)
S-Mite SS was crushed with a ball mill under the conditions of 4 kg of powder and 40 g of grinding media for 1 hour to obtain a crushing agent having a fineness of 5680 cm ² / g in terms of Blaine specific surface area. A slurry-like osmotic crushing agent E3 was obtained in the same manner as in Example 1 except that 100 parts of this crushing agent having a Blaine specific surface area of 5680 cm ² / g was used instead of S-Mite SS. The characteristics of osmotic crushing agent E3 were measured. The fluidity was 275 mm in flow value, and the permeability was 0.039 mm in the deepest point gap.

Example 4
S-Mite SS was crushed with a ball mill under conditions of 4 kg of powder and 40 g of grinding media for 2 hours to obtain a crushing agent having a fineness of 5820 cm ² / g in terms of Blaine specific surface area. A slurry-like osmotic crushing agent E4 was obtained in the same manner as in Example 1 except that 100 parts of this crushing agent having a Blaine specific surface area of 5820 cm ² / g was used instead of S-Mite SS. The characteristics of the osmotic crushing agent E4 were measured. The fluidity was 274 mm in flow value, the permeability was 0.029 mm in the deepest point gap, and the pot life was 30 minutes. FIG. 4 shows the change over time in the expansion pressure (measured at 30 ° C.), and FIG. 5 shows the change over time in the expansion pressure (measured at 5 ° C., 20 ° C., and 30 ° C.) together with the crushing agent of Comparative Example 1.

(Example 5)
Example 1 is the same as Example 1 except that 100 parts of the crushing agent having a Blane specific surface area of 5820 cm ² / g described in Example 3 and 1.0 part of the concrete high-performance water reducing agent were used instead of the commercially available S-Mite SS. Similarly, slurry-like osmotic crushing agent E5 was obtained. The characteristics of osmotic crushing agent E5 were measured. The fluidity was 300 mm in flow value, and the pot life was 60 minutes.

(Example 6)
Example 1 is the same as Example 1 except that 100 parts of the crushing agent having a Blane specific surface area of 5820 cm ² / g described in Example 3 and 0.75 part of the concrete high-performance water reducing agent are used instead of the commercially available S-Mite SS. Similarly, slurry-like osmotic crushing agent E6 was obtained. The characteristics of osmotic crushing agent E6 were measured. The fluidity was 300 mm in flow value, and the pot life was 50 minutes.

(Example 7)
Example 1 is the same as Example 1 except that 100 parts of the crushing agent having a Blane specific surface area of 5820 cm ² / g described in Example 3 and 1.25 parts of the concrete high-performance water reducing agent are used instead of the commercially available S-Mite SS. Similarly, slurry-like osmotic crushing agent E7 was obtained. The characteristics of osmotic crushing agent E7 were measured. The fluidity was 300 mm in flow value, and the pot life was 10 minutes.

(Example 8)
In the same manner as in Example 1 except that 100 parts of crushing agent having a Blane specific surface area of 5820 cm ² / g described in Example 3 and 33 parts of water were used instead of commercially available S-Mite SS as a crushing agent, Of osmotic crushing agent E8 was obtained. The characteristics of osmotic crushing agent E8 were measured. The fluidity was 300 mm in flow value. Moreover, the time-dependent change of expansion pressure (measured at 30 degreeC) is shown in FIG.

Example 9
Instead of commercially available S-Mite SS as a crushing agent, 100 parts of a crushing agent having a Blane specific surface area of 5820 cm ² / g described in Example 3 was used, and Mighty 100 (manufactured by Kao Corporation) was used as a high-performance concrete water reducing agent instead of Melflux 2651F. , Naphthalenesulfonic acid type) was used in the same manner as in Example 1 except that 1 part was used to obtain a slurry-like osmotic crushing agent E9. The characteristics of osmotic crushing agent E9 were measured. The fluidity was 250 mm in flow value.

(Example 10)
Instead of commercially available S-Mite SS as a crushing agent, 100 parts of a crushing agent having a Blane specific surface area of 5820 cm ² / g described in Example 3 was used, and Tupole (Takemoto Yushi Co., Ltd.) was used as a concrete high-performance water reducing agent instead of Melflux 2651F. A slurry-like osmotic crushing agent E10 was obtained in the same manner as in Example 1 except that 1 part of a polycarboxylic acid type was used. The characteristics of osmotic crushing agent E10 were measured. The fluidity was 253 mm in flow value.

(Example 11)
In the same manner as in Example 1 except that 100 parts of crushing agent having a Blane specific surface area of 5820 cm ² / g described in Example 3 and 35 parts of water were used instead of commercially available S-Mite SS as a crushing agent, Of osmotic crushing agent E11 was obtained. The characteristics of the osmotic crushing agent E11 were measured. The fluidity was 300 mm in flow value. FIG. 4 shows changes with time in the expansion pressure (measured at 30 ° C.).

(Comparative Example 1)
A slurry-like static crushing agent R1 was obtained by kneading 100 parts of commercially available S-Mite SS as a crushing agent and 30 parts of water and not containing a water reducing agent using a hand mixer. The characteristics of the static crushing agent R1 were measured. The fluidity was 241 mm in flow value. The permeability could not be injected into a 0.5 mm gap. FIG. 5 shows changes with time in the expansion pressure (measured at 5 ° C., 20 ° C., and 30 ° C.).

(Comparative Example 2)
A slurry-like static crushing agent was used in the same manner as in Comparative Example 1 except that 100 parts of the crushing agent having a Blane specific surface area of 5820 cm ² / g described in Example 3 was used instead of the commercially available S-Mite SS. R2 was obtained. The characteristics of the static crushing agent R2 were measured. The flowability was 75 mm in flow value, and the pot life was 0 minutes.

(Comparative Example 3)
As a crushing agent, 100 parts of the crushing agent having a Blane specific surface area of 5820 cm ² / g described in Example 3 was used in place of the commercially available S-Mite SS. A slurry-like static crushing agent R3 was obtained in the same manner as in Example 1 except that 1 part of 8 (manufactured by BASF, lignin sulfonic acid type) was used. The characteristics of the static crushing agent R3 were measured. The fluidity was 140 mm in flow value.

(Comparative Example 4)
Instead of the commercially available S-Mite SS as a crushing agent, 100 parts of the crushing agent having a Blane specific surface area of 5820 cm ² / g described in Example 3 was used, and a normal water reducing agent Melment F4000 (BASF Corporation) was used instead of the concrete high performance water reducing agent. A slurry-like static crushing agent R4 was obtained in the same manner as in Example 1 except that 1 part of the product was made. The characteristics of the static crushing agent R4 were measured. The fluidity was 210 mm in flow value.

1, 4, 10 Concrete structure 2, 5, 11 Crack 3, 6, 12 Penetration type crushing agent 7, 13 Syringe 8, 14 Adapter 9, 15 Water stop layer 16 Supply path

Claims (6)

Contains crushing agent, concrete high-performance water reducing agent, and water,
The content ratio of the concrete high-performance water reducing agent is 0.5 to 1.25 parts by weight with respect to 100 parts by weight of the crushing agent,
The water content is 25 to 35 parts by weight with respect to 100 parts by weight of the crushing agent,
The fineness of the crushing agent is 3000 to 7000 cm ² / g in terms of Blaine specific surface area, and
An osmotic crushing agent characterized by having a flow value of 250 to 300 mm.   The osmotic crushing agent according to claim 1, wherein the concrete high-performance water reducing agent is melflux. A permeation step for permeating the penetration type crushing agent according to claim 1 or 2 into a crack of a concrete structure having deteriorated and cracked;
A crushing process for curing the concrete structure and crushing a concrete deterioration part,
A concrete repairing method comprising a removing step of removing the concrete deteriorated portion crushed in the crushing step.   The water-stopping layer forming step of forming a water-stopping layer on at least a part of the surface of the concrete structure that has deteriorated and cracked before the infiltration step. Concrete repair method. An infiltration step for infiltrating the infiltration type crushing agent according to claim 1 or 2 into a porous structure of a concrete structure having a porous concrete portion;
Crushing step of curing the concrete structure and crushing the porous concrete part;
A concrete repairing method comprising a removing step of removing the porous concrete portion crushed in the crushing step. A permeation step of permeating the permeation type crushing agent according to claim 1 or 2 into the voids of a concrete structure having a junker part having voids;
Crushing step of curing the concrete structure and crushing the junker part,
A concrete repairing method comprising: a removal step of removing the junker portion crushed in the crushing step.

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