WO2006061901A1 - 緊張材用被覆物および緊張材 - Google Patents
緊張材用被覆物および緊張材 Download PDFInfo
- Publication number
- WO2006061901A1 WO2006061901A1 PCT/JP2004/018358 JP2004018358W WO2006061901A1 WO 2006061901 A1 WO2006061901 A1 WO 2006061901A1 JP 2004018358 W JP2004018358 W JP 2004018358W WO 2006061901 A1 WO2006061901 A1 WO 2006061901A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- tendon
- layer
- covering
- curing
- moisture
- Prior art date
Links
- 210000002435 tendon Anatomy 0.000 title claims abstract description 127
- 239000000463 material Substances 0.000 title claims abstract description 75
- 239000004567 concrete Substances 0.000 claims abstract description 71
- 229920005989 resin Polymers 0.000 claims abstract description 56
- 239000011347 resin Substances 0.000 claims abstract description 56
- -1 ketimine compound Chemical class 0.000 claims abstract description 48
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 40
- 239000003822 epoxy resin Substances 0.000 claims abstract description 38
- 230000035699 permeability Effects 0.000 claims abstract description 27
- 239000004743 Polypropylene Substances 0.000 claims abstract description 22
- 229920001155 polypropylene Polymers 0.000 claims abstract description 22
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 claims abstract description 11
- 238000001723 curing Methods 0.000 claims description 104
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 61
- 239000003795 chemical substances by application Substances 0.000 claims description 57
- 239000013078 crystal Substances 0.000 claims description 33
- 229920003002 synthetic resin Polymers 0.000 claims description 29
- 239000000057 synthetic resin Substances 0.000 claims description 29
- 150000001875 compounds Chemical class 0.000 claims description 22
- 239000011248 coating agent Substances 0.000 claims description 14
- 238000000576 coating method Methods 0.000 claims description 14
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical group [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 10
- 238000013008 moisture curing Methods 0.000 claims description 10
- 239000011513 prestressed concrete Substances 0.000 claims description 8
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 5
- XBDUTCVQJHJTQZ-UHFFFAOYSA-L iron(2+) sulfate monohydrate Chemical compound O.[Fe+2].[O-]S([O-])(=O)=O XBDUTCVQJHJTQZ-UHFFFAOYSA-L 0.000 claims 1
- 230000007797 corrosion Effects 0.000 abstract description 15
- 238000005260 corrosion Methods 0.000 abstract description 15
- 239000000843 powder Substances 0.000 abstract description 11
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 abstract description 5
- 239000000292 calcium oxide Substances 0.000 abstract description 5
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 abstract description 5
- 229910052943 magnesium sulfate Inorganic materials 0.000 abstract description 5
- 235000019341 magnesium sulphate Nutrition 0.000 abstract description 5
- 150000004688 heptahydrates Chemical class 0.000 abstract description 2
- 230000001747 exhibiting effect Effects 0.000 abstract 1
- 230000010354 integration Effects 0.000 abstract 1
- 230000002265 prevention Effects 0.000 abstract 1
- 239000000203 mixture Substances 0.000 description 17
- 229910000831 Steel Inorganic materials 0.000 description 15
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- 238000002425 crystallisation Methods 0.000 description 14
- 230000008025 crystallization Effects 0.000 description 14
- 230000007613 environmental effect Effects 0.000 description 13
- 238000005259 measurement Methods 0.000 description 9
- WRUGWIBCXHJTDG-UHFFFAOYSA-L magnesium sulfate heptahydrate Chemical compound O.O.O.O.O.O.O.[Mg+2].[O-]S([O-])(=O)=O WRUGWIBCXHJTDG-UHFFFAOYSA-L 0.000 description 8
- 229940061634 magnesium sulfate heptahydrate Drugs 0.000 description 8
- QGBSISYHAICWAH-UHFFFAOYSA-N dicyandiamide Chemical compound NC(N)=NC#N QGBSISYHAICWAH-UHFFFAOYSA-N 0.000 description 7
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 description 7
- 238000000034 method Methods 0.000 description 7
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- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 3
- IBVAQQYNSHJXBV-UHFFFAOYSA-N adipic acid dihydrazide Chemical compound NNC(=O)CCCCC(=O)NN IBVAQQYNSHJXBV-UHFFFAOYSA-N 0.000 description 3
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- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 150000001412 amines Chemical class 0.000 description 2
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 description 2
- 229910052921 ammonium sulfate Inorganic materials 0.000 description 2
- 235000011130 ammonium sulphate Nutrition 0.000 description 2
- 150000004982 aromatic amines Chemical class 0.000 description 2
- HUMNYLRZRPPJDN-UHFFFAOYSA-N benzaldehyde Chemical compound O=CC1=CC=CC=C1 HUMNYLRZRPPJDN-UHFFFAOYSA-N 0.000 description 2
- 235000019445 benzyl alcohol Nutrition 0.000 description 2
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 description 2
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- ZCCIPPOKBCJFDN-UHFFFAOYSA-N calcium nitrate Chemical compound [Ca+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ZCCIPPOKBCJFDN-UHFFFAOYSA-N 0.000 description 2
- 150000001728 carbonyl compounds Chemical class 0.000 description 2
- 238000006482 condensation reaction Methods 0.000 description 2
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- 229920001903 high density polyethylene Polymers 0.000 description 2
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- 150000002576 ketones Chemical class 0.000 description 2
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- 150000003839 salts Chemical class 0.000 description 2
- VZWGHDYJGOMEKT-UHFFFAOYSA-J sodium pyrophosphate decahydrate Chemical compound O.O.O.O.O.O.O.O.O.O.[Na+].[Na+].[Na+].[Na+].[O-]P([O-])(=O)OP([O-])([O-])=O VZWGHDYJGOMEKT-UHFFFAOYSA-J 0.000 description 2
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- 235000019345 sodium thiosulphate Nutrition 0.000 description 2
- HLBLWEWZXPIGSM-UHFFFAOYSA-N 4-Aminophenyl ether Chemical compound C1=CC(N)=CC=C1OC1=CC=C(N)C=C1 HLBLWEWZXPIGSM-UHFFFAOYSA-N 0.000 description 1
- ZHJGWYRLJUCMRT-UHFFFAOYSA-N 5-[6-[(4-methylpiperazin-1-yl)methyl]benzimidazol-1-yl]-3-[1-[2-(trifluoromethyl)phenyl]ethoxy]thiophene-2-carboxamide Chemical compound C=1C=CC=C(C(F)(F)F)C=1C(C)OC(=C(S1)C(N)=O)C=C1N(C1=C2)C=NC1=CC=C2CN1CCN(C)CC1 ZHJGWYRLJUCMRT-UHFFFAOYSA-N 0.000 description 1
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- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
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- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 1
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- RWCCWEUUXYIKHB-UHFFFAOYSA-N benzophenone Chemical compound C=1C=CC=CC=1C(=O)C1=CC=CC=C1 RWCCWEUUXYIKHB-UHFFFAOYSA-N 0.000 description 1
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- YMHQVDAATAEZLO-UHFFFAOYSA-N cyclohexane-1,1-diamine Chemical compound NC1(N)CCCCC1 YMHQVDAATAEZLO-UHFFFAOYSA-N 0.000 description 1
- 125000000113 cyclohexyl group Chemical group [H]C1([H])C([H])([H])C([H])([H])C([H])(*)C([H])([H])C1([H])[H] 0.000 description 1
- 238000012691 depolymerization reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- ZZTCPWRAHWXWCH-UHFFFAOYSA-N diphenylmethanediamine Chemical compound C=1C=CC=CC=1C(N)(N)C1=CC=CC=C1 ZZTCPWRAHWXWCH-UHFFFAOYSA-N 0.000 description 1
- 125000003700 epoxy group Chemical group 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 description 1
- 125000000623 heterocyclic group Chemical group 0.000 description 1
- 150000004677 hydrates Chemical class 0.000 description 1
- 150000002430 hydrocarbons Chemical group 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 150000004658 ketimines Chemical class 0.000 description 1
- 239000011565 manganese chloride Substances 0.000 description 1
- 235000002867 manganese chloride Nutrition 0.000 description 1
- 229940099607 manganese chloride Drugs 0.000 description 1
- CNFDGXZLMLFIJV-UHFFFAOYSA-L manganese(II) chloride tetrahydrate Chemical compound O.O.O.O.[Cl-].[Cl-].[Mn+2] CNFDGXZLMLFIJV-UHFFFAOYSA-L 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
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- AFEQENGXSMURHA-UHFFFAOYSA-N oxiran-2-ylmethanamine Chemical compound NCC1CO1 AFEQENGXSMURHA-UHFFFAOYSA-N 0.000 description 1
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- 150000004686 pentahydrates Chemical class 0.000 description 1
- WVDDGKGOMKODPV-ZQBYOMGUSA-N phenyl(114C)methanol Chemical compound O[14CH2]C1=CC=CC=C1 WVDDGKGOMKODPV-ZQBYOMGUSA-N 0.000 description 1
- 229920000768 polyamine Polymers 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- AOHJOMMDDJHIJH-UHFFFAOYSA-N propylenediamine Chemical compound CC(N)CN AOHJOMMDDJHIJH-UHFFFAOYSA-N 0.000 description 1
- 230000025508 response to water Effects 0.000 description 1
- 238000000518 rheometry Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/08—Members specially adapted to be used in prestressed constructions
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- B32B15/00—Layered products comprising a layer of metal
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
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- B32B3/10—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material
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- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B1/00—Constructional features of ropes or cables
- D07B1/16—Ropes or cables with an enveloping sheathing or inlays of rubber or plastics
- D07B1/162—Ropes or cables with an enveloping sheathing or inlays of rubber or plastics characterised by a plastic or rubber enveloping sheathing
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B2270/00—Resin or rubber layer containing a blend of at least two different polymers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/54—Yield strength; Tensile strength
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/724—Permeability to gases, adsorption
- B32B2307/7242—Non-permeable
- B32B2307/7246—Water vapor barrier
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/726—Permeability to liquids, absorption
- B32B2307/7265—Non-permeable
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2419/00—Buildings or parts thereof
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2201/00—Ropes or cables
- D07B2201/20—Rope or cable components
- D07B2201/2015—Strands
- D07B2201/2042—Strands characterised by a coating
- D07B2201/2044—Strands characterised by a coating comprising polymers
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2201/00—Ropes or cables
- D07B2201/20—Rope or cable components
- D07B2201/2015—Strands
- D07B2201/2042—Strands characterised by a coating
- D07B2201/2045—Strands characterised by a coating comprising multiple layers
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2501/00—Application field
- D07B2501/20—Application field related to ropes or cables
- D07B2501/2015—Construction industries
- D07B2501/2023—Concrete enforcements
Definitions
- the present invention relates to a covering for a tendon and a tendon.
- Patent Document 1 has developed the following technique. That is, a tension member in which a curable composition (coating for a tension material) that is liquid in a normal state but gradually cures at room temperature is injected between a sheath and a tension material in advance at a factory or the like. Keep it. Next, this tension member is brought into the site, placed at a predetermined position in the concrete casting formwork, concrete is placed in the formwork, and after the concrete is hardened, it is coated with a liquid tensioning material. Tension the tendon before the object hardens. After that, the covering for the tension material is gradually cured at room temperature, so that the tension material and the concrete are finally integrated.
- a curable composition coating for a tension material
- the grout injection work at the construction site can be eliminated.
- a tension material coating is injected between the sheath and the tension material in the factory in advance, an incomplete portion is unlikely to be generated in the sheath, and tension due to intrusion of moisture or the like from the incomplete portion is thus prevented. It can also prevent corrosion of the material.
- the period in which the tendon covering is in a fluid state is referred to as the “tensile tensioning period” and is the period until the tendon covering is completely cured. Is referred to as the “curing period”.
- Patent Document 2 employs a moisture-curing type epoxy resin that starts to harden by reacting with moisture (water vapor) as the covering for a tension material
- Technologies have been proposed that can prevent rapid curing reactions at high temperatures near 10 ° C and extend the tensionable period of tendons. That is, in the present technology, the moisture generated by curing the concrete is taken into the moisture curable epoxy resin through the sheath, thereby starting the curing of the moisture curable epoxy resin.
- the tension coating is adjusted by adjusting the composition of the tension material coating in consideration of the amount of moisture generated during concrete curing. It will be possible to manage the tensioning and curing periods of the material.
- Patent Document 1 Japanese Patent Publication No. 5-69939
- Patent Document 2 JP 2002-60465 A
- the amount of water generated when the concrete is hardened depends greatly on various factors such as the water-cement ratio in the concrete, the concrete temperature, the concrete thickness, and the environmental temperature'humidity. , The conditions change from construction site to construction site, and the covering for tendons is earlier than planned There was a possibility that it would harden or not harden even after the scheduled period. In particular, in order to take in moisture through the sheath, when the tension member is placed under high humidity such as in the rainy season, the curing of the moisture-curing epoxy resin has already started before being brought into the site. There was a possibility.
- An object of the present invention is to reduce the work on site, and to integrate the tension material and the concrete to prevent corrosion of the tension material, to allow the tension material to be tensioned, and to set the curable resin. It is desirable to provide a tension material covering and a tension material that can reliably control the curing period of the material.
- the present invention is a tendon covering for covering the surface of a tendon constituting the prestressed concrete, the first layer covering the surface of the tendon and including a curable resin. And a second layer that is provided outside the first layer and includes a curable resin, a moisture curable curing agent, and a crystal water-containing compound, and is provided outside the second layer, And a third layer comprising a water-impermeable and moisture-impermeable synthetic resin.
- the tendon material is a steel material (PC steel material) for a prestressed concrete structure.
- These tendons include steel bars, steel wires, and steel stranded wires. Examples of steel bars include those specified in JIS G3109.
- Steel wire includes, for example, those specified in JIS G3536.
- the steel stranded wire is obtained by twisting the steel wire.
- the curable resin of the first layer is hardened until it is laid and tensioned on site at the factory to apply the curable resin to the tendon. More preferably, it is hardened before the concrete is placed. In short, it is preferable that the curable resin of the first layer is cured as early as possible.
- the powder of curable resin is cooled by force by applying electrostatic powder coating on the surface of the tension material, and the curable resin constituting the first layer is thereby cured in the factory. Can wear.
- the curing period of the curable resin can be adjusted by adding appropriate amounts of various curing agents to the curable resin of the first layer.
- the curing agent include amine curing agents such as aliphatic amines, aromatic amines, and alicyclic amines, polyamide curing agents, latent curing agents, moisture curing curing agents such as ketimine compounds described below, and the like. Can be adopted.
- the curing period of the curable resin can be adjusted by adding a curing aid such as a curing accelerator or a latent curing agent to the curable resin of the first layer.
- a curing aid such as a curing accelerator or a latent curing agent
- the curable resin of the first layer has a corrosion resistance of at least 10 years, preferably 20 years or more by covering the surface of the tendon, and has an adhesive property to the tendon.
- epoxy resin epoxy resin, polyester resin, and polyurethane resin can be used. Of these, epoxy resin is more preferable as the curable resin of the first layer.
- Epoxy resin is a resin having two or more reactive groups called epoxy groups in one molecule.
- Epoxy resins include bisphenol A diglycidyl ether, bisphenol F diglycidyl ether, novolac glycidyl ether, tetraglycidylamine diphenol methane, and the like. In particular, bisphenol A diglycidyl ether and bisphenol F diglycidyl ether are suitable because of their low cost.
- the first layer includes an inner layer that covers the surface of the tendon, and an outer layer that is provided outside the inner layer and inside the second layer.
- the inner layer includes a curable resin and at least one of a curing accelerator and a latent curing agent
- the outer layer includes a substantially water-impermeable and moisture-impermeable synthetic resin. It can be done.
- the curable resin constituting the inner layer may be the same as the curable resin constituting the first layer.
- the inner layer may be configured to include at least one of a latent curing agent and a curing accelerator. As described above, the inner layer is formed as early as possible before placing concrete. What is necessary is just to determine the kind of latent hardener and a hardening accelerator, addition amount, etc. so that curable resin of this may harden
- the amount of the latent curing agent or curing accelerator added can be, for example, 10% by weight or less based on the curable resin.
- latent curing agent for example, dicyandiamide and derivatives thereof, dihydrazides such as adipic dihydrazide, diaminomaleol-tolyl and derivatives thereof, aminoadducts, microcapsules coated with a curing agent, and the like can be used.
- curing accelerator examples include tertiary amine compounds such as 2,4,6-tris (diaminomethyl) phenol and benzyldimethylamine, imidazole compounds, and BF complexes.
- the tendon Since the first layer of curable resin is thus cured early, the tendon is less susceptible to the influence of the external environment, so that the tendon can be reliably prevented from corroding due to intrusion of moisture or the like from the outside.
- the outer layer constitutes the outer layer
- the substantially non-moisture permeable and non-water permeable synthetic resin has a moisture permeability force temperature of 40 ° C according to JIS Z0208, relative Can be 50gZm 2 '24h or less at 90% humidity and 40 ⁇ m thickness.
- the moisture permeability according to JIS Z0208 is the number of grams of water vapor that passes through a lm 2 film with a thickness of 40 ⁇ m in 24 hours under conditions of a temperature of 40 ° C and a relative humidity of 90%. It is a thing.
- the unit of moisture permeability is expressed as gZm 2 '24h.
- a synthetic resin having a moisture permeability of 50 gZm 2 '24 h or less indicates that the moisture permeability is relatively small, and therefore can be considered as a substantially non-moisture permeable and non-water permeable synthetic resin. That is, the outer layer synthetic resin can prevent water permeability and moisture permeability from the outside. Conversely, synthetic resins with a moisture permeability greater than 50gZ m 2 '24h may not be able to sufficiently prevent water and moisture from the outside.
- the synthetic resin having a moisture permeability of 50 gZm 2 '24 h or less includes, but is not limited to, polyethylene, polypropylene and the like. Specifically, the moisture permeability of high density polyethylene is 20 gZm 2 '24h, and the moisture permeability of polypropylene is 5 gZm 2 ' 24h. For this reason, the synthetic resin constituting the outer layer is preferably polypropylene.
- the moisture permeability varies depending on the thickness of the outer layer, that is, the thicker the outer layer, The moisture permeability is reduced. Accordingly, the thickness of the tendon covering is preferably 0.6 mm or more, more preferably 1. Omm or more, and further preferably 1.5 mm or more. If the thickness of the outer layer is less than 0.6 mm, the moisture permeability may be satisfied, but the strength may decrease. In addition, as the resin constituting the outer layer, one having alkali resistance is preferred in order to resist the alkali of concrete.
- the curable resin constituting the second layer can be considered in the same manner as the curable resin of the first layer.
- epoxy resin polyester resin, polyurethane resin
- the epoxy resin is preferable. This epoxy resin can also be considered as described above.
- the moisture curable curing agent of the second layer is a substance that reacts with moisture to produce a curing agent, and initiates the curing reaction of the curable resin with this curing agent.
- a ketimine compound is preferable.
- the ketimine compound is a compound having a ketimine bond that is induced by a dehydration condensation reaction between a carbonyl compound and an amine compound. This dehydration condensation reaction can be carried out, for example, by adding a carbo-louie compound more than the theoretical reaction amount to the amine compound and removing the reaction product water.
- the ketimine bond can be represented by the following formula (see Chemical Formula 1).
- R and R are a hydrogen atom, an alkyl group, or a cyclohexyl group.
- the carbonyl compound is a compound that ketimines an amine compound, and includes ketones and aldehydes.
- Ketones include, for example, acetone, methyl ethyl ketone, methyl propyl ketone, aromatic ketones such as acetophenone and benzophenone.
- aldehydes include chain aldehydes such as formaldehyde and acetoaldehyde, aromatic aldehydes such as benzaldehyde, and the like.
- the amine compound any of aliphatic, alicyclic and aromatic compounds can be adopted, and any of monoamine, polyamine and polyamide can be used.
- amine compounds include methylamine, ethylamine, ethylenediamine, propylenediamine, alkoxypropylamine, arylamine, diaminodiphenylmethane, diaminodiphenylether, diaminocyclohexane and the like.
- the crystallization water-containing compound in the second layer preferably releases crystallization water starting from heat generated during concrete pouring.
- the curable resin does not start to cure before the concrete is placed, but the hardenable resin starts to cure on the basis of the concrete placement.
- the period during which tension can be applied and the curing period of curable resin can be reliably managed.
- the synthetic resin of the third layer may be in a molten state at a high temperature close to 200 ° C. Therefore, the second layer is formed.
- the compound containing water of crystallization is exposed to a high temperature and releases water of crystallization.
- the outer layer is rapidly cooled to cure the synthetic resin of the third layer, there is almost no effect that the curable resin of the second layer starts to cure due to the release of the crystal water. .
- the crystal water-containing compound releases crystal water at a temperature of 100 ° C or lower.
- Such crystallization water-containing compounds include sodium pyrophosphate decahydrate, ammonium sulfate, aluminum 24 hydrate, potassium myoban, aluminum sulfate 18 hydrate, magnesium sulfate 7 Hydrate, iron sulfate ( ⁇ ) ⁇ 7 hydrate (ferrous sulfate ⁇ 7 hydrate), Manganese chloride ⁇ 4 hydrate, calcium nitrate ⁇ 4 hydrate, sodium thiosulfate ⁇ 5 hydrate Can be used.
- the number of crystallization water is not limited to the above.
- Crystalline water release temperature of each compound containing water of crystallization is 100 ° C for sodium pyrophosphate decahydrate, ammonium sulfate, aluminum. 93.5 ° C for 24 hydrate, potassium miyoban force 92. 5 ° C,
- Aluminum sulfate ⁇ 18 hydrate is 8 6.5 ° C
- Magnesium sulfate ⁇ Heptahydrate is 70 ° C
- Iron sulfate (II) ⁇ 7 hydrate (Ferrous sulfate ⁇ 7 hydrate Product) is 64 ° C
- manganese chloride tetrahydrate is 58 ° C
- calcium nitrate tetrahydrate is 45 ° C
- sodium thiosulfate ⁇ pentahydrate is 33 ° C.
- the crystal water-containing compound releases crystal water at a temperature of 90 ° C or lower. It is more preferable to release crystal water. However, since the temperature of the external environment is about 35 ° C in summer such as road sites, it is more preferable that the compound containing crystal water releases crystal water at a temperature of 40 ° C or higher. For compounds containing water of crystallization, the crystallization water release temperature is certainly higher than the expected external environment temperature, for example 25 ° C, but not too high. (II) Hydrate is preferred.
- the second layer may further include a heat generating agent in addition to the raw material.
- the heat generating agent is preferably calcium carbonate.
- the exothermic agent generates heat in response to water, and includes, for example, calcium carbonate, salt aluminum hydrate and the like.
- the strength of water containing crystallization To release crystal water, the heat of fusion unique to each compound is required. Therefore, when the calorific power generated when the concrete is hardened is larger than the calorific value that releases the crystal water, the crystal water containing the crystal water is also released, especially without adding a heat generating agent.
- the amount of heat becomes insufficient, it is necessary to add a heat generating agent to ensure a sufficient amount of heat.
- the type and amount of the moisture-curing curing agent and the crystal water-containing compound are set.
- the tensionable period of the tendon and the curing period of the curable resin are adjusted.
- the second layer may contain a curing aid such as the above-described curing accelerator or latent curing agent.
- the moisture curing type curing agent alone is in this case, a latent curing agent or the like can be added because the curing period may be too long.
- the third layer forms the outer shape of the tendon as the outermost layer, protects the inside, and functions as a protective film when the second layer is in an uncured fluid state.
- the synthetic resin of the third layer the same synthetic resin as the outer layer in the case where the first layer has a two-layer configuration of the inner layer and the outer layer, for example, polypropylene can be employed.
- the synthetic resin constituting the third layer is preferably one having alkali resistance in order to counteract the alkali of concrete.
- the crystallization water-containing material releases crystallization water due to heat generated when the concrete starts to harden, and the released moisture and the moisture-curing curing agent are hydrolyzed.
- a depolymerization reaction occurs to generate a curing agent, and the generated curing agent initiates hardening of the curable resin.
- this heat generating agent works to help release crystal water from the water containing crystal water.
- part of the crystal water of the crystal water-containing compound is released due to the heat generated during hardening of the concrete, and the exothermic agent generates heat due to the moisture, and other crystal water is also released, and the hydrolysis reaction proceeds as described above. .
- the third layer is composed of a substantially water-impermeable and moisture-impermeable synthetic resin, the hydrolysis reaction proceeds in a closed system in the second layer. For this reason, even if the covering for tendon is placed under high humidity, it is hardly affected by the external environment, so it must be transported to a factory power station, that is, before placing concrete. There is no risk that the curable resin begins to harden.
- the second layer of curable resin starts to harden due to the heat generated when the concrete starts to harden after the concrete is placed. Prior to placing, the second layer of curable resin does not begin to harden, so the tensionable period of the tendon can be reliably managed.
- the tensioning period of the tendon is preferably within 0.5 years (June) for placing concrete in consideration of workability.
- the curable resin of the second layer can be adjusted to be surely cured in a predetermined period. For this reason, the tension material and the concrete can be integrated, and the curing period of the second layer of curable resin can be reliably managed. Therefore, it is possible to reliably prevent the tendon from corroding due to the uncured covering of the tendon.
- the hardening period of the second layer is preferably within 3 years from the placement of concrete, more preferably within 1.5 years.
- the first layer covering the surface of the tendon is provided, and by adjusting the curable resin of the first layer to be cured before concrete placement, moisture generated after concrete placement is reduced. Transmission to the tension material can be reliably prevented, and corrosion of the tension material can be more reliably prevented. In addition, since the tension material covered with the tension material coating is formed in advance at a factory, etc., the grout agent injection work at the site becomes unnecessary, so the work at the site can be reduced. [0031]
- the tendon of the present invention is characterized in that the surface is covered with the tendon covering as described above.
- the covering for tension material and the tension material of the present invention the work on site can be reduced, and the tension material and the concrete can be integrated to prevent corrosion of the tension material. There is an effect that the tensionable period of the material and the curing period of the curable resin can be reliably managed.
- FIG. 1 is a cross-sectional view showing a tendon covering according to a first embodiment of the present invention.
- FIG. 2 is a cross-sectional view showing a tendon covering according to a second embodiment of the present invention.
- FIG. 3 is a diagram showing the contents and results of an example of the present invention.
- FIG. 1 is a cross-sectional view showing a tendon covering 1 according to the first embodiment.
- the tendon covering 1 covers the surface of the tendon 100 constituting prestressed concrete (not shown).
- the tension material covering 1 includes a first layer 110 covering the surface of the tension material 100 as a core material, a second layer 120 provided outside the first layer 110, and an outer side of the second layer 120. And a third layer 130 provided.
- the tendon 100 is a steel stranded wire obtained by twisting a steel wire for a prestressed concrete structure.
- the first layer 110 includes an epoxy resin that is a curable resin.
- the first layer 110 is obtained by adhering an epoxy resin powder to the surface of the tendon 100 by electrostatic powder coating, and then cooling and completely curing the powder.
- Thickness 1 It is formed as Omm. Therefore, the first layer 110 has already hardened during the manufacturing stage of the tendon covering 1, that is, before being brought into the field.
- the second layer 120 is an epoxy resin that is a curable resin, a ketimine compound that is a moisture curing type curing agent, magnesium sulfate heptahydrate that is a crystal water-containing compound, and an exothermic agent. It is composed of calcium oxide and calcium. Magnesium sulfate heptahydrate releases crystal water at 70 ° C. In other words, magnesium sulfate heptahydrate does not release crystal water at a general external environment temperature such as 25 ° C, but releases crystal water at a temperature higher than the external environment temperature. Will do.
- the blending amount and blending ratio of each material constituting the second layer 120 are such that the tensionable period of the tendon is within 0.5 years (June) from the placement of the concrete, and the curing period is concrete. 1. Adjust so that it is within 5 years. In order to make such adjustments, for example, considering the water-cement ratio of concrete and environmental conditions such as temperature, temperature, and humidity due to heat generation of concrete, a curing accelerator such as a curing accelerator or a latent curing agent is added. It can be added in the second layer 120.
- examples of the curing accelerator include 2,4,6-tris (diaminomethyl) phenol, tertiary amine compounds such as benzyldimethylamine, imidazole compounds, and BF complexes. be able to.
- the latent curing agent for example, dicyandia
- dihydrazides such as adipic acid dihydrazide, diaminomaleo-tolyl and derivatives thereof, amine adducts, and microcapsules coated with a curing agent.
- the composition of the second layer 120 in this embodiment includes 100 parts of epoxy resin, 2 parts of ketimine compound, 6 parts of magnesium sulfate heptahydrate, 5 parts of calcium oxide, and a latent curing agent.
- Some dicyandiamide can be 0.2 parts.
- the third layer 130 is made of polypropylene and has a thickness of 2. Omm.
- This polypropylene has a moisture permeability of 40 ° C according to JIS Z0208, a relative humidity of 90%, and a thickness of 40 ⁇ m. Since m is 5 gZm 2 '24h, it is a substantially non-permeable and moisture-permeable synthetic resin.
- the synthetic resin constituting the third layer 130 is not limited to the polypropylene, but is substantially non-permeable and non-moisture synthetic resin, for example, synthetic resin having a moisture permeability of 50 gZm 2 '24h or less. Can be adopted.
- a formwork for placing concrete is assembled, and the tendon 100 covered with the tendon covering 1 is placed at a predetermined position in the formwork.
- place concrete in the formwork and wait until it reaches the specified hardness.
- the concrete when the concrete begins to harden, the concrete generates heat of hydration and reaches a high temperature near 100 ° C. And when this hydration heat is transmitted to the magnesium sulfate 7 hydrate of the second layer 120, the magnesium sulfate 7 hydrate releases part of the crystal water, and this crystal water reacts with the calcium carbonate. Thus, the temperature inside the second layer 120 becomes even higher. For this reason, magnesium sulfate heptahydrate also releases all remaining crystal water, and this released crystal water reacts with the ketimine compound to produce a curing agent. The fat curing reaction begins.
- the tension material 100 is tensioned within 6 months from the concrete placement, which is within the tensionable period of the tension material, to prestress the concrete. After that, within 1.5 years from the placement of the concrete, the epoxy resin of the second layer 120 is completely cured, so that the tension material 100 is protected from corrosion and the prestressed concrete structure is constructed. Is completed.
- the epoxy resin in the second layer 120 begins to harden due to the heat generated when the concrete begins to harden. Since the fat does not begin to harden, the tensionable period of the tendon 100 can be managed reliably. Specifically, the tensionable period of the tendon 100 can be reliably managed within 0.5 years from the placement of concrete.
- the third layer 130 is made of substantially water-impermeable and moisture-impermeable polypropylene. Therefore, for example, even if the tendon covering 1 is placed under high humidity, it is hardly affected by the external environment, so the epoxy resin of the second layer 120 is hardened before placing the concrete. It can be prevented from starting.
- the epoxy resin of the second layer 120 is surely cured in a predetermined period.
- the curing period can be reliably managed as 1.5 years from the placement of concrete.
- FIG. 2 is a cross-sectional view showing the tendon covering 2 according to the second embodiment.
- the tendon covering 2 includes a first layer 210 covering the surface of the tendon 100, the second layer 120 provided outside the first layer 210, and a second layer.
- the third layer 130 provided on the outer side of 120 is configured and manufactured by a general extruder.
- the first layer 210 includes an inner layer 211 that covers the surface of the tendon material 100 and an outer layer 212 that is provided outside the inner layer 211. Accordingly, the tendon covering 2 is configured as a four-layer structure of an inner layer 211, an outer layer 212, a second layer 120, and a third layer 130.
- the inner layer 211 forms a protective film around the tendon 100 to prevent any corrosion, and provides anticorrosion for at least 10 years, preferably 20 years or more, and also adheres to the tendon 100. Good is desirable.
- the inner layer 211 includes an epoxy resin that is a curable resin.
- the epoxy resin for example, bisphenol A diglycidyl ether, bisphenol F diglycidyl ether, novolac glycidyl ether, tetraglycidylamine diphenol methane and the like can be used.
- bisphenol A diglycidyl ether and bisphenol F diglycidyl ether are suitable because of low cost.
- the inner layer 211 is hardened before placing concrete, which is preferably cured at a factory or the like after the epoxy resin is applied to the tendon 100 and then laid on the site and strained. More preferably. For this reason, at least one of a latent curing agent and a curing accelerator is added to the inner layer 211.
- this latent curing agent for example, dicyandiamide and its derivatives, dihydrazides such as adipic dihydrazide, diaminomaleol-tolyl and its derivatives, aminoadducts, microcapsules coated with a curing agent, and the like can be used.
- the curing accelerator that can be used include tertiary amine compounds such as 2,4,6-tris (diaminomethyl) phenol and benzyldimethylamine, imidazole compounds, and BF complexes. Also potential
- a diluent such as benzyl alcohol, a filler such as talc, and the like can be employed.
- the composition of the inner layer 211 in this embodiment is 100 parts of epoxy resin, 8 parts of dicyandiamide as a latent curing agent, and 2,4,6-tris (diaminomethyl) phenol as a curing accelerator. 4 parts, 10 parts of benzyl alcohol as a diluent and 15 parts of talc as a filler.
- the outer layer 212 is made of polypropylene.
- polypropylene has a moisture permeability of 40 ° C, relative humidity of 90%, thickness of 40 ⁇ m, and 5 g / m 2 ⁇ 24 h in accordance with JIS Z0208. It has moisture permeability.
- the moisture permeability varies depending on the thickness of the outer layer 212. That is, the thicker the outer layer 212, the smaller the moisture permeability. Accordingly, the thickness of the outer layer 212 is preferably 0.6 mm or more, more preferably 1. Omm or more, and further preferably 1.5 mm or more.
- the outer layer 212 of this embodiment is formed with a thickness of 1.6 mm.
- the thickness of outer layer 212 is 0.6m If it is less than m, the moisture permeability may be satisfied, but the strength, etc. may be reduced.
- the resin constituting the outer layer 212 is excellent in acid resistance, alkali resistance, and chemical resistance! /, And is preferred!
- the first layer 210 has a two-layer structure of the inner layer 211 and the outer layer 212, corrosion of the tendon 100 can be reliably prevented.
- the outer layer 212 is made of substantially water-impermeable and moisture-impermeable polypropylene, and the inner layer 211 is hardened before the concrete is placed by adjusting the composition of the inner layer 211. Corrosion of the tendon 100 can be more reliably prevented.
- the curable resin of the second layer 120 is an epoxy resin, but is not limited thereto, and may be, for example, a polyester resin or a polyurethane resin.
- magnesium sulfate heptahydrate is employed as the compound containing water of crystallization of the second layer 120, but is not limited to this.
- the above-described iron (II) sulfate 7 Other water-containing crystallization compounds such as hydrates and aluminum sulfate 18 hydrate can also be used.
- calcium carbonate is used as a heat generating agent, but is not limited thereto, and other heat generating agents such as salt water aluminum hydrate may be used.
- the second layer 120 can be configured without adding a heat generating agent.
- the force in which the third layer 130 is made of polypropylene is not limited to this.
- a non-moisture-permeable and non-water-permeable synthetic resin such as polyethylene or high-density polyethylene is used.
- the moisture permeability according to JIS Z0208 is 50gZm 2 '24h or less at a temperature of 40 ° C, a relative humidity of 90%, and a thickness of 40 ⁇ m. Can be used.
- the outer layer 212 is made of polypropylene. However, similar to the third layer 130, the outer layer 212 can be formed by using a substantially non-moisture permeable and non-water permeable synthetic resin. In each of the embodiments described above, the thickness of the third layer 130 is 2. Omm, but is not particularly limited, and can be, for example, 0.6 mm or more.
- the thickness of the outer layer 212 is 1.6 mm, but is not particularly limited.
- the outer layer 212 can be formed to have a thickness of 0.6 mm or more.
- the inner layer 211 is configured to include the latent curing agent and the curing accelerator, but is not limited thereto, and includes at least one of the latent curing agent and the curing accelerator. What is necessary is just to determine in consideration of the curing period of the inner layer 211.
- a raw material having the following composition was used to evaluate a three-layered covering for a tension material comprising a first layer, a second layer, and a third layer by an extrusion molding machine, and then evaluated.
- Epoxy resin Epoxy powder resin powder E100, manufactured by Nippon Paint Co., Ltd. B> Second layer configuration
- Epoxy resin Adeka Resin EP-4100, manufactured by Asahi Denka Co., Ltd .; 100 parts
- Ketimine compound EPIKURE H3, manufactured by Japan Epoxy Resin Co., Ltd .; 2 parts
- Ade force hardener EH-3842 manufactured by Asahi Denka Co., Ltd .: 0.2 part
- Epoxy powder resin powder E100 was applied to the surface of PC steel stranded wire by electrostatic powder coating at a temperature of 180 ° C and a curing time of 15 minutes. Thereafter, this was cooled to cure the epoxy resin to form a first layer having a thickness of 1 mm.
- Polypropylene was extruded at a thickness of 2. Omm on the surface coated with the composition of the second layer.
- the tendon coating was manufactured by the above process.
- An environmental model was set up to deal with the generation of heat of hydration that accompanies hardening when concrete is placed and the subsequent cooling.
- Two environmental models were set: high temperature conditions corresponding to high-temperature areas and summertime, and low-temperature conditions corresponding to normal areas and wintertime. Specifically, using a constant temperature and humidity chamber, as a high temperature condition, after 14 days exposure to an environment with a temperature of 90 ° C and a relative humidity of 60%, an environment with a temperature of 25 ° C and a relative humidity of 60% The model exposed below was set. In the case of low-temperature conditions, a model was set in which the sample was exposed to an environment of 70 ° C and 60% relative humidity for 14 days and then exposed to an environment of 25 ° C and 60% relative humidity. However, only the high temperature conditions are described in the examples of the present application.
- Viscoelasticity analyzer manufactured by Rheology
- Measurement object The sample exposed from the environmental model was peeled off the third layer from the tendon after a lapse of a predetermined time and sampled from the second layer.
- the test was performed even under high temperature conditions.
- the tension possible period In the measurement of the tension possible period, the tension was possible 20 days after the start of the neglect in the environmental model, but the tension was impossible after 25 days. In other words, the tensionable period of tendons was 20-25 days.
- the curing period After leaving it in a high-temperature environment model, place it in an environment at a temperature of 25 ° C and a relative humidity of 60%. It was cured in May. In other words, the curing period was 1 year 2 months 1 year 1 May.
- a raw material having the following composition was used to produce a four-layer tension material covering comprising an inner layer and an outer layer, a second layer, and a third layer constituting the first layer by an extrusion molding machine. Evaluation was performed.
- Epoxy resin Adeka Resin EP-4100, manufactured by Asahi Denka Co., Ltd .; 100 parts
- Dicyandiamide Ade force hardener EH-3842, manufactured by Asahi Denka Co., Ltd .: 8 parts
- Epoxy resin Adeka Resin EP-4100, manufactured by Asahi Denka Co., Ltd .; 100 parts
- Ketimine compound EPIKURE H3, manufactured by Japan Epoxy Resin Co., Ltd .; 2 parts
- Ade force hardener EH-3842 manufactured by Asahi Denka Co., Ltd .: 0.2 part
- Polypropylene was extruded at a thickness of 1.6 mm on the surface of the inner layer.
- Polypropylene was extruded on the surface of the second layer with a thickness of 2. Omm.
- the tendon coating was manufactured by the above process.
- Evaluation of the manufactured covering for tendon was carried out by measuring the tensionable period of the tension material and measuring the curing period under the low temperature condition of the first example.
- the tension possible period In the measurement of the tension possible period, the tension was possible 20 days after the start of the neglect in the environmental model, but the tension was impossible after 25 days. In other words, the tensionable period of tendons was 20-25 days. Also, the measurement of the curing period is allowed to stand in a low-temperature environment model, then placed in an environment at a temperature of 25 ° C and a relative humidity of 60%. It was cured in May. In other words, the curing period was 1 year 2 months 1 year 1 May.
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Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0489950A (ja) * | 1990-07-31 | 1992-03-24 | Sumitomo Electric Ind Ltd | 付着性に優れた被覆pc鋼より線 |
JP2000281967A (ja) * | 1999-03-31 | 2000-10-10 | Sumitomo Electric Ind Ltd | プレストレストコンクリート緊張材用硬化性組成物及び緊張材 |
JP2000282378A (ja) * | 1999-03-30 | 2000-10-10 | Sumitomo Electric Ind Ltd | 防錆被覆pc鋼より線及びその製造方法 |
JP2001207388A (ja) * | 2000-01-28 | 2001-08-03 | Kawatetsu Techno Wire Kk | 重防食pc鋼より線及び製造方法 |
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2004
- 2004-12-09 WO PCT/JP2004/018358 patent/WO2006061901A1/ja active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0489950A (ja) * | 1990-07-31 | 1992-03-24 | Sumitomo Electric Ind Ltd | 付着性に優れた被覆pc鋼より線 |
JP2000282378A (ja) * | 1999-03-30 | 2000-10-10 | Sumitomo Electric Ind Ltd | 防錆被覆pc鋼より線及びその製造方法 |
JP2000281967A (ja) * | 1999-03-31 | 2000-10-10 | Sumitomo Electric Ind Ltd | プレストレストコンクリート緊張材用硬化性組成物及び緊張材 |
JP2001207388A (ja) * | 2000-01-28 | 2001-08-03 | Kawatetsu Techno Wire Kk | 重防食pc鋼より線及び製造方法 |
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