WO2020003430A1 - Procédé de réparation de béton et agent de réparation - Google Patents

Procédé de réparation de béton et agent de réparation Download PDF

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Publication number
WO2020003430A1
WO2020003430A1 PCT/JP2018/024530 JP2018024530W WO2020003430A1 WO 2020003430 A1 WO2020003430 A1 WO 2020003430A1 JP 2018024530 W JP2018024530 W JP 2018024530W WO 2020003430 A1 WO2020003430 A1 WO 2020003430A1
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WO
WIPO (PCT)
Prior art keywords
silicate
concrete
crack
water
cement
Prior art date
Application number
PCT/JP2018/024530
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English (en)
Japanese (ja)
Inventor
豊 富田
Original Assignee
日本プロロング株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 日本プロロング株式会社 filed Critical 日本プロロング株式会社
Priority to PCT/JP2018/024530 priority Critical patent/WO2020003430A1/fr
Priority to PCT/JP2019/025287 priority patent/WO2020004434A1/fr
Priority to CN201980043550.2A priority patent/CN112469876A/zh
Priority to JP2020527562A priority patent/JPWO2020004434A1/ja
Publication of WO2020003430A1 publication Critical patent/WO2020003430A1/fr
Priority to PH12020552131A priority patent/PH12020552131A1/en

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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/60—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only artificial stone
    • C04B41/61—Coating or impregnation
    • C04B41/65—Coating or impregnation with inorganic materials
    • C04B41/68—Silicic acid; Silicates
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G23/00—Working measures on existing buildings
    • E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging

Definitions

  • the present invention relates to a method and a repair agent for repairing concrete, and more particularly, to a method and a repair agent for repairing cracks formed in concrete.
  • the surface of concrete is exposed to various environments such as drying, solar radiation, temperature change, humidity change, exposure to rain and carbon dioxide, and frost damage. It is important to protect concrete from these factors and prevent concrete deterioration to extend the life. However, it is difficult to actually make concrete without cracks.
  • the crack width is 0.3 mm for a general building structure, and 0.2 mm for a general civil engineering structure.
  • the present invention is a method for repairing concrete, A first step of injecting, spraying or applying a solution containing silicate to the surface of the cracked concrete; A second step of injecting or applying and filling an inorganic material fluidized by water into a crack having a surface of concrete wet with a solution containing silicate; Spraying or applying a solution containing silicate to the surface of the concrete after the inorganic material has been filled in the cracks.
  • the crack can be filled with the gel, and sufficient waterproofness and water stoppage can be imparted.
  • Concrete is prepared by putting cement, aggregate, water, and admixture into a mixer, mixing, kneading, assembling a formwork, placing it in a formwork, curing it so that setting proceeds properly, and removing it from the mold. It is manufactured in a desired shape.
  • Cement is a powder that contains clinker generated by mixing limestone, clay, and the like and firing, and gypsum, and is a powder that hardens by a hydration reaction, polymerization, or the like.
  • the aggregate is made of gravel, sand, or the like, and reduces the proportion of cement, thereby suppressing heat generation due to the hydration reaction of the cement and shrinkage due to evaporation of moisture.
  • the admixture is an agent added for the purpose of improving strength and durability, adjusting the setting speed, and the like.
  • Curing is the work of controlling the temperature and moisture content until the concrete is sufficiently hardened.
  • the concrete is covered with a blue sheet or the like, the temperature is kept at an appropriate temperature by a heater or the like, and water content is kept at a specified level by water sprinkling or the like.
  • Concrete contains excess water, and due to drying shrinkage, temperature change, humidity change, exposure to rain and carbon dioxide, and frost damage caused by evaporation of the excess water, as well as external factors such as building weight and seismic force. Under load, cracks occur.
  • Concrete cracking is acceptable if it has a certain width. On the other hand, it is required to take appropriate measures for a crack width exceeding this. Cracks requiring treatment include small cracks having a width of less than 0.2 mm and large cracks having a width of 0.2 mm or more. A method for repairing both will be described with reference to FIG.
  • FIG. 1 is a flowchart showing a flow of work for repairing cracks formed in concrete.
  • the operation starts from step 100, and in step 101, the surface of the concrete surface is cleaned or the like so that the solution for repair is easily injected.
  • the cleaning of the base is performed by using a brush, high-pressure water such as fresh water, a wire brush, or the like to remove dust and the like.
  • FIG. 2A is a diagram exemplifying a crack visible in appearance
  • FIG. 2B is an enlarged view of a cross section cut along a cutting line AA.
  • the width of cracks on the concrete surface is measured.
  • the crack width is the width of the crack shown in FIG. 2 (b).
  • a crack scale (ruler) or a system that calculates the width by capturing the crack with a camera and analyzing the captured image is used as a measuring instrument. Can be measured.
  • the width of the crack is related to the size of the crack. As the crack width increases, rainwater and the like easily penetrate, and the strength of the concrete decreases.
  • step 103 it is checked whether the crack width is 0.2 mm or more. If it is 0.2 mm or more, proceed to step 104, and if it is less than 0.2 mm, proceed to step 124. In step 104, it is checked whether the crack width is 0.3 mm or more.
  • the determination is made based on the two crack widths of 0.2 mm and 0.3 mm, but is not limited to 0.2 mm and 0.3 mm, and an appropriate width can be set as appropriate.
  • step 105 proceed to step 105 and use a grinding device such as a disc grinder to form a groove with a U-shaped or V-shaped cross section along the crack.
  • a grinding device such as a disc grinder to form a groove with a U-shaped or V-shaped cross section along the crack.
  • step 106 After cleaning the inside of the groove with high-pressure water or a wire brush using clean water, the process proceeds to step 106, where water is sprayed for deep penetration.
  • step 107 a solution containing silicate (hereinafter, referred to as a silicate solution) ) Is injected, sprayed or applied to wet the cracked surface.
  • silicate solution a solution containing silicate
  • the silicate solution is, for example, an alkali silicate aqueous solution prepared by mixing at least two of sodium silicate, potassium silicate, and lithium silicate and adding an appropriate amount of water.
  • the aqueous alkali silicate solution is a solution having a pH of 11 to 12, a small particle size of silicate of about 1 to 10 nm, and a low viscosity of 6 to 8 (mPa ⁇ s).
  • the mixing ratio when mixing the two can be in the range of 1: 9 to 9: 1 in molar ratio, and can be 3: 7 to 7: 1. It is desirable to set it within the range of 7: 3.
  • the mixing ratio of sodium silicate can be 5 to 90 mol%
  • potassium silicate can be 5 to 90 mol%
  • lithium silicate can be 5 to 90 mol%
  • sodium silicate can be 15 to 70 mol%.
  • Potassium silicate is preferably 15 to 70 mol%
  • lithium silicate is preferably 15 to 70 mol%.
  • the amount of water added to the silicate may be any amount as long as the silicate can be dispersed.
  • Examples of the method of applying the silicate solution include brushing, roll coating, spray coating and the like.
  • Examples of a method for spraying the silicate solution include a method using a spray. When using a spray, the nozzle can be brought into close contact with the cracks to attempt deep penetration.
  • a method for injecting the silicate solution a method using an oil jug can be exemplified.
  • the crack 11 after the application of the silicate solution or the like is, for example, as shown in FIG. Referring to FIG. 3A, the silicate solution penetrates by about several mm from the concrete surface inside the crack to form the modified portion 13, and the exposed surface in the crack 11 is covered with the silicate solution 12. It is in a wet state.
  • Step 108 water is sprinkled on the entire construction surface to be kept wet.
  • step 109 at which the inorganic material fluidized by water is injected or applied as an aqueous filler. This is because the crack is filled to some extent by an inorganic material having a relatively large particle diameter.
  • cement can be used as the inorganic material.
  • generally used cement particles are preferably fine particles because of their large particle size.
  • the cement is fluidized into a cement slurry, which can be injected by a hand-operated mortar pump. Further, an admixture may be added as needed to improve fluidization.
  • Portland cement can be used as the cement, but is not limited thereto, and may be blast furnace cement, silica cement, fly ash cement, or the like.
  • Blast furnace cement is a cement in which fine powder of blast furnace slag and Portland cement are mixed.
  • Silica cement is a cement in which a natural siliceous mixture containing 60% or more of silica and Portland cement are mixed.
  • Fly ash cement is a cement in which coal incineration ash (fly ash) and Portland cement are mixed.
  • the injection of the cement slurry can be started with a low-concentration slurry, and with a high-concentration slurry having a water-cement ratio of 60 to 80% while changing the composition.
  • the crack 11 after filling in step 109 is as shown in FIG. That is, a certain portion of the crack 11 is filled with the cement 14.
  • the reason is that the cement fluidized by the addition of water has a larger particle diameter and a higher viscosity than the silicate solution, and therefore does not immediately flow downward unlike the silicate solution.
  • the crack filling in this method uses an inorganic material such as cement, and does not use an organic material such as an epoxy resin or an acrylic resin, so that the deterioration of the material over time can be eliminated. Further, by using together with the silicate solution, it is possible to prevent hardening or shrinkage phenomenon from appearing in the injected cement grout, peeling off from the concrete on the cracked surface, and generating new cracks.
  • the method of applying the fluidized inorganic material includes brushing, roll coating, spray coating, and the like, as in the method of applying the silicate solution.
  • a hand-pressed mortar pump can be used.
  • the cement 14 reacts with water in the filled cracks 11, polymerizes and hardens, and integrates with the concrete 10. With this alone, it is not possible to follow the subsequent shrinkage due to drying or temperature change, and new cracks are generated. In addition, when the injection proceeds and the crack width is reduced, a portion where the cement particles cannot be injected occurs, and remains as a defect. In this case, rainwater or the like enters from the defects, deteriorating the concrete, and lowering the durability.
  • the silicate solution is sprayed or applied again on the concrete surface after the inorganic material is filled in Step 111.
  • the silicate solution is permeated into the remaining voids. Since the silicate solution is wetted in step 107, the silicate solution can be spread even between the fine particles of the cement 14 filled in step 109.
  • the application of the silicate solution or the like is performed after the injected inorganic material is cured so as to have a certain level of strength.
  • the standard of the curing time is about 12 hours.
  • the silicate solution is a solution having a small particle diameter of silicate and a low viscosity as described above, it penetrates into narrow gaps between cement particles and the like, and a groove or the like which rises vertically due to a capillary phenomenon. And is retained in the crack 11 without flowing out.
  • a silicate solution it is possible to infiltrate the inside of a concrete surface by spraying or coating only, or even a small crack. After the application of the silicate solution, water is sprayed over the entire construction area in step 112 to sufficiently wet the construction surface.
  • the silicate solution reacts with calcium hydroxide contained in concrete via water (a porazone reaction) to generate alkali calcium silicate (gel).
  • the calcium ions combine with the silicate anion chains to form calcium silicate chains, which combine with each other to cause gelation. Due to this gelation, the above-mentioned space is closed, and intrusion of rainwater or the like is prevented. That is, as shown in FIG. 3C, the voids other than the portion filled with the cement 14 in the crack 11 are closed by the gel 15.
  • the silicate solution is preferably an alkali silicate aqueous solution prepared by mixing sodium silicate and potassium silicate among the above three materials. This is because sodium ions or potassium ions do not lengthen the silicate anion chain, but rather shorten it, thereby delaying gelation. As a result, the time required for gelation becomes longer, and the alkali silicate aqueous solution can be permeated deep into the concrete.
  • the molar ratio of sodium silicate to potassium silicate is 3: 7 to 7: It is desirable to be within the range of 3.
  • the silicate solution can be applied in the same manner as the silicate solution or the fluidized inorganic material.
  • the silicate solution used in step 107 and the silicate solution used in step 111 may be a solution in which the same two or more kinds of alkali silicates are mixed, or a mixture of two or more different kinds of alkali silicates. There may be.
  • the amount of water to be added may be the same or different between the silicate solution used in step 107 and the silicate solution used in step 111.
  • the groove is filled with an inorganic material (cement) as a filler to fill the groove.
  • an inorganic material cement
  • water is sprayed at step 114, and a silicate solution is sprayed or applied at step 115.
  • Watering is performed within a few centimeters on both sides around the crack.
  • the application of the silicate solution and the like are also performed in the same range as the watering.
  • the silicate solution may be a solution obtained by mixing two or more kinds of alkali silicates same as the silicate solution used in step 107 or step 111, or may be a solution obtained by mixing two or more kinds of different alkali silicates. There may be.
  • the amount of water to be added may be the same as that of the silicate solution used in step 107 or step 111, or may be a different amount.
  • step 116 After applying the silicate solution, etc., in step 116, water is sprayed on the entire construction area to sufficiently wet the construction surface.
  • step 104 If the crack width is less than 0.3 mm as determined in step 104, the process proceeds to step 117, and water is sprayed without forming the above-mentioned grooves.
  • step 118 the silicate solution is injected into the concrete surface having cracks. Or spray or apply.
  • step 119 water is sprinkled, and in step 120, the inorganic material fluidized by the addition of water is injected or applied and filled.
  • step 121 water is sprinkled in step 121, and in step 122, the silicate solution is sprayed or applied to the concrete surface after filling the inorganic material. Thereafter, in step 123, water is sprayed on the entire construction section to sufficiently wet the construction surface.
  • step 125 If the crack width is less than 0.2 mm in step 103, water is sprinkled in step 124, and then only spraying or coating of the silicate solution is performed in step 125. This is because the cracks themselves are small and it is not necessary to roughly fill the cracks with cement particles.
  • step 125 a silicate solution is injected to generate the gel 15 and close the void. After the application of the silicate solution or the like, water is sprayed on the entire construction area in step 126 to sufficiently wet the construction surface.
  • step 116 After watering in step 116 or step 123 or step 126, the process proceeds to step 127, where it is checked whether or not another crack exists. If there is, the process returns to step 102, and the same operation is performed for other cracks. Do.
  • step 127 If it is confirmed in step 127 that the object does not exist, the process proceeds to step 128 to perform curing.
  • water can be supplied by sprinkling water or the like in order to promote the reaction with calcium in the concrete.
  • step 129 repair of concrete cracks is completed.
  • FIG. 4 illustrates only one configuration.
  • FIG. 5 is a view of the case 20 as viewed from above. Thereby, a simulated crack was formed by the gap 26 between the two concrete blocks 24.
  • an alkali silicate aqueous solution 27 containing sodium silicate and potassium silicate in a molar ratio of 5: 5 is placed on two concrete blocks 24 on the upper surface of two concrete blocks 24 whose periphery is sealed with a caulking material 25. 24, and the surface was wetted.
  • the silicate solution was penetrated and reformed by a thickness of about several mm from the concrete surface inside the gap 26, and the reformed portion 28 was formed.
  • cement (cement dispersion liquid) 29 fluidized by water was applied to the upper surfaces of the two concrete blocks 24. After a while, the cement 29 solidifies and loses its tackiness. After confirming that the tackiness had disappeared, the same aqueous alkali silicate solution as described above was again applied to the upper surfaces of the two concrete blocks 24 and cured for one week. The space between the two concrete blocks 24 after curing was filled with a filler (cement and formed gel) 30.
  • the test was performed by placing water 32 on the upper part 31 of the acrylic case 20 and observing whether water leaked to the bottom part 33 of the acrylic case 20, as shown in FIG.
  • the upper part 31 is the upper part of the two concrete blocks 24 sealed by the caulking material 25 and the filler 30 in the case 20, and the bottom part 33 is the lower part of the plate 23 in the case 20.
  • the bottom portion 33 was observed for several days with the intervals of 0.5 mm and 0.75 mm, but no water leakage was observed.
  • a repair agent in addition to the method for repairing cracks in concrete, a repair agent can also be provided.
  • the repair agent is composed of a silicate solution and an aqueous filler mixed with an inorganic material.
  • Aqueous fillers can also include admixtures to improve fluidization.
  • Aqueous fillers can be filled by pouring or application into cracks having concrete surfaces moistened with a silicate solution.
  • Aqueous fillers can be produced by adding water and the like to an inorganic material at the site, mixing the resultant, and adding additives as necessary.
  • the present invention is not limited to the above-described embodiment, and may include other embodiments, additions, modifications, deletions, and the like.
  • the present invention can be modified within a range that can be conceived by a person skilled in the art, and any embodiment is included in the scope of the present invention as long as the operation and effect of the present invention are exhibited.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Architecture (AREA)
  • Structural Engineering (AREA)
  • Ceramic Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Civil Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Aftertreatments Of Artificial And Natural Stones (AREA)
  • Working Measures On Existing Buildindgs (AREA)

Abstract

L'invention concerne un procédé de réparation qui permet de remplir une fissure avec un gel de façon à fournir des propriétés d'imperméabilité à l'eau adéquates et des propriétés d'étanchéité à l'eau adéquates même dans le cas où la largeur de la fissure est égale ou supérieure à une certaine largeur. Le procédé comprend : une première étape d'injection, de pulvérisation ou d'application d'une solution contenant un silicate sur une surface en béton ayant une fissure; une deuxième étape de réalisation d'un remplissage par injection ou application d'un matériau inorganique fluidisé par ajout d'eau, dans la fissure ayant la surface en béton humidifiée avec la solution contenant du silicate; et une troisième étape de pulvérisation ou d'application d'une solution contenant du silicate sur la surface en béton dans laquelle la fissure a été remplie avec le matériau inorganique.
PCT/JP2018/024530 2018-06-28 2018-06-28 Procédé de réparation de béton et agent de réparation WO2020003430A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
PCT/JP2018/024530 WO2020003430A1 (fr) 2018-06-28 2018-06-28 Procédé de réparation de béton et agent de réparation
PCT/JP2019/025287 WO2020004434A1 (fr) 2018-06-28 2019-06-26 Procédé de reformage de béton et matériau de reformage
CN201980043550.2A CN112469876A (zh) 2018-06-28 2019-06-26 混凝土的改性方法及改性材料
JP2020527562A JPWO2020004434A1 (ja) 2018-06-28 2019-06-26 コンクリートの改質方法および改質材
PH12020552131A PH12020552131A1 (en) 2018-06-28 2020-12-10 Concrete modifying method and modifying material

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Application Number Priority Date Filing Date Title
PCT/JP2018/024530 WO2020003430A1 (fr) 2018-06-28 2018-06-28 Procédé de réparation de béton et agent de réparation

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WO2020003430A1 true WO2020003430A1 (fr) 2020-01-02

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PCT/JP2018/024530 WO2020003430A1 (fr) 2018-06-28 2018-06-28 Procédé de réparation de béton et agent de réparation
PCT/JP2019/025287 WO2020004434A1 (fr) 2018-06-28 2019-06-26 Procédé de reformage de béton et matériau de reformage

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CN (1) CN112469876A (fr)
PH (1) PH12020552131A1 (fr)
WO (2) WO2020003430A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2021113140A (ja) * 2020-01-17 2021-08-05 株式会社グリーンドゥ セメント系構造物の強度向上方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7049377B2 (ja) * 2020-01-31 2022-04-06 恒謙 葭葉 外壁タイルの補強方法
CN114354081B (zh) * 2022-01-10 2023-12-05 镇江市建设工程质量检测中心有限公司 一种混凝土板渗漏点检测装置及检测方法

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JPS5578764A (en) * 1978-11-08 1980-06-13 Onoda Kenzai Kk Repair and restoration of reinforced concrete or inorganic material
JPH1179868A (ja) * 1997-09-03 1999-03-23 Mitsubishi Materials Corp 中性化したコンクリートのアルカリ性回復工法
JP2003137674A (ja) * 2001-10-29 2003-05-14 Eiwa:Kk コンクリート構造物の劣化防止方法
JP2004323333A (ja) * 2003-04-28 2004-11-18 Soma Takafumi コンクリート改質材
JP2007009487A (ja) * 2005-06-29 2007-01-18 Chubu Renewale Kk コンクリートのひび割れ補修工法
JP2010070403A (ja) * 2008-09-17 2010-04-02 Linack Co Ltd 新規コンクリートの乾燥収縮ひび割れ抑制方法及びひび割れ抑制剤、並びに既設コンクリートのひび割れ閉塞方法及びひび割れ閉塞剤
JP2011256066A (ja) * 2010-06-08 2011-12-22 Shimoda Gijutsu Kenkyusho:Kk コンクリート構造物の保護方法

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CN100523408C (zh) * 2008-05-15 2009-08-05 浙江中富建筑集团股份有限公司 一种建筑墙体裂缝修补方法

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5578764A (en) * 1978-11-08 1980-06-13 Onoda Kenzai Kk Repair and restoration of reinforced concrete or inorganic material
JPH1179868A (ja) * 1997-09-03 1999-03-23 Mitsubishi Materials Corp 中性化したコンクリートのアルカリ性回復工法
JP2003137674A (ja) * 2001-10-29 2003-05-14 Eiwa:Kk コンクリート構造物の劣化防止方法
JP2004323333A (ja) * 2003-04-28 2004-11-18 Soma Takafumi コンクリート改質材
JP2007009487A (ja) * 2005-06-29 2007-01-18 Chubu Renewale Kk コンクリートのひび割れ補修工法
JP2010070403A (ja) * 2008-09-17 2010-04-02 Linack Co Ltd 新規コンクリートの乾燥収縮ひび割れ抑制方法及びひび割れ抑制剤、並びに既設コンクリートのひび割れ閉塞方法及びひび割れ閉塞剤
JP2011256066A (ja) * 2010-06-08 2011-12-22 Shimoda Gijutsu Kenkyusho:Kk コンクリート構造物の保護方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2021113140A (ja) * 2020-01-17 2021-08-05 株式会社グリーンドゥ セメント系構造物の強度向上方法

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CN112469876A (zh) 2021-03-09
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WO2020004434A1 (fr) 2020-01-02

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