KR101586980B1 - Repair-reinforcement method for concrete structure using polymer mortar comprising aramid fibers and surface protectant containing ceramic urethane - Google Patents
Repair-reinforcement method for concrete structure using polymer mortar comprising aramid fibers and surface protectant containing ceramic urethane Download PDFInfo
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- KR101586980B1 KR101586980B1 KR1020150120379A KR20150120379A KR101586980B1 KR 101586980 B1 KR101586980 B1 KR 101586980B1 KR 1020150120379 A KR1020150120379 A KR 1020150120379A KR 20150120379 A KR20150120379 A KR 20150120379A KR 101586980 B1 KR101586980 B1 KR 101586980B1
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- 239000004567 concrete Substances 0.000 title claims abstract description 59
- 229920006231 aramid fiber Polymers 0.000 title claims abstract description 15
- 239000000919 ceramic Substances 0.000 title claims description 9
- 239000004570 mortar (masonry) Substances 0.000 title abstract description 37
- 238000000034 method Methods 0.000 title abstract description 24
- 239000004760 aramid Substances 0.000 title description 4
- 229920000642 polymer Polymers 0.000 title description 4
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 title description 3
- 239000000463 material Substances 0.000 claims abstract description 90
- 230000008439 repair process Effects 0.000 claims abstract description 43
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 40
- 238000004381 surface treatment Methods 0.000 claims abstract description 36
- 229920005989 resin Polymers 0.000 claims abstract description 25
- 239000011347 resin Substances 0.000 claims abstract description 25
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- 230000002787 reinforcement Effects 0.000 claims abstract description 21
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- 239000000377 silicon dioxide Substances 0.000 claims abstract description 13
- 239000004568 cement Substances 0.000 claims abstract description 11
- 239000002253 acid Substances 0.000 claims abstract description 10
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000011248 coating agent Substances 0.000 claims abstract description 9
- 238000000576 coating method Methods 0.000 claims abstract description 9
- 239000011398 Portland cement Substances 0.000 claims abstract description 8
- 229920000609 methyl cellulose Polymers 0.000 claims abstract description 7
- 239000001923 methylcellulose Substances 0.000 claims abstract description 7
- 235000010981 methylcellulose Nutrition 0.000 claims abstract description 7
- 239000003381 stabilizer Substances 0.000 claims abstract description 6
- 239000003822 epoxy resin Substances 0.000 claims description 21
- 229920000647 polyepoxide Polymers 0.000 claims description 21
- 239000003795 chemical substances by application Substances 0.000 claims description 19
- 150000001412 amines Chemical class 0.000 claims description 12
- 125000000524 functional group Chemical group 0.000 claims description 10
- 230000001681 protective effect Effects 0.000 claims description 10
- 239000002904 solvent Substances 0.000 claims description 10
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- 229910010413 TiO 2 Inorganic materials 0.000 claims description 5
- 239000000049 pigment Substances 0.000 claims description 5
- 229920002803 thermoplastic polyurethane Polymers 0.000 claims description 5
- 238000004040 coloring Methods 0.000 claims description 4
- 238000004383 yellowing Methods 0.000 claims description 4
- 239000000654 additive Substances 0.000 claims description 3
- 239000004417 polycarbonate Substances 0.000 abstract description 3
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- 230000008719 thickening Effects 0.000 abstract description 3
- 230000007797 corrosion Effects 0.000 abstract description 2
- 238000005260 corrosion Methods 0.000 abstract description 2
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- 238000012360 testing method Methods 0.000 description 27
- 239000000835 fiber Substances 0.000 description 20
- 230000003014 reinforcing effect Effects 0.000 description 16
- 239000012779 reinforcing material Substances 0.000 description 12
- 230000005856 abnormality Effects 0.000 description 10
- 239000003513 alkali Substances 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 230000000694 effects Effects 0.000 description 8
- 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 7
- 239000003960 organic solvent Substances 0.000 description 7
- 239000011150 reinforced concrete Substances 0.000 description 7
- 238000005728 strengthening Methods 0.000 description 7
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 6
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 6
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- 238000012423 maintenance Methods 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 239000004593 Epoxy Substances 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 4
- -1 acryl Chemical group 0.000 description 4
- 239000011230 binding agent Substances 0.000 description 4
- 238000006386 neutralization reaction Methods 0.000 description 4
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- 238000010998 test method Methods 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 229940106691 bisphenol a Drugs 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
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- 239000002245 particle Substances 0.000 description 3
- 230000035515 penetration Effects 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- 230000036314 physical performance Effects 0.000 description 3
- ZNQVEEAIQZEUHB-UHFFFAOYSA-N 2-ethoxyethanol Chemical compound CCOCCO ZNQVEEAIQZEUHB-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 2
- 239000004908 Emulsion polymer Substances 0.000 description 2
- 239000005057 Hexamethylene diisocyanate Substances 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 125000000217 alkyl group Chemical group 0.000 description 2
- 229920003235 aromatic polyamide Polymers 0.000 description 2
- 125000004432 carbon atom Chemical group C* 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000002708 enhancing effect Effects 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000004848 polyfunctional curative Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000012756 surface treatment agent Substances 0.000 description 2
- LFQCEHFDDXELDD-UHFFFAOYSA-N tetramethyl orthosilicate Chemical compound CO[Si](OC)(OC)OC LFQCEHFDDXELDD-UHFFFAOYSA-N 0.000 description 2
- 244000025254 Cannabis sativa Species 0.000 description 1
- 235000012766 Cannabis sativa ssp. sativa var. sativa Nutrition 0.000 description 1
- 235000012765 Cannabis sativa ssp. sativa var. spontanea Nutrition 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
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- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 239000002518 antifoaming agent Substances 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 235000009120 camo Nutrition 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 229920002301 cellulose acetate Polymers 0.000 description 1
- 235000005607 chanvre indien Nutrition 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
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- 239000000428 dust Substances 0.000 description 1
- 238000004299 exfoliation Methods 0.000 description 1
- 239000011487 hemp Substances 0.000 description 1
- RRAMGCGOFNQTLD-UHFFFAOYSA-N hexamethylene diisocyanate Chemical compound O=C=NCCCCCCN=C=O RRAMGCGOFNQTLD-UHFFFAOYSA-N 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000008204 material by function Substances 0.000 description 1
- 239000012046 mixed solvent Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 230000020477 pH reduction Effects 0.000 description 1
- 229920000962 poly(amidoamine) Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 239000005056 polyisocyanate Substances 0.000 description 1
- 229920001228 polyisocyanate Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
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- 238000011084 recovery Methods 0.000 description 1
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- 150000003673 urethanes Chemical class 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
Images
Classifications
-
- 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
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/50—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials
- C04B41/5025—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials with ceramic materials
- C04B41/5035—Silica
-
- 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
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
-
- 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
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/46—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with organic materials
- C04B41/48—Macromolecular compounds
- C04B41/4803—Polysaccharides, e.g. cellulose, or derivatives thereof
-
- 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
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/46—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with organic materials
- C04B41/49—Compounds having one or more carbon-to-metal or carbon-to-silicon linkages ; Organo-clay compounds; Organo-silicates, i.e. ortho- or polysilicic acid esters ; Organo-phosphorus compounds; Organo-inorganic complexes
- C04B41/4905—Compounds having one or more carbon-to-metal or carbon-to-silicon linkages ; Organo-clay compounds; Organo-silicates, i.e. ortho- or polysilicic acid esters ; Organo-phosphorus compounds; Organo-inorganic complexes containing silicon
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D37/00—Repair of damaged foundations or foundation structures
-
- 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
Abstract
Description
The present invention relates to a method for repairing and reinforcing concrete structures using aramid fiber-incorporated polymer mortar and ceramic urethane-containing surface protective material.
Concrete structures begin to deteriorate due to acidification, air pollution, CO 2 , SO 2 , salinity, etc. as a long time passes and the surface of the structure begins to deteriorate. As a result, various problems such as durability deterioration of the entire concrete structure . Various techniques have been developed and new methods have been developed for repairing and reinforcing the deteriorated concrete structure, and a satisfactory level of repair and strengthening method is being implemented.
Generally, a method of repairing and reinforcing a deteriorated concrete structure includes removing impurities from a surface of a deteriorated concrete structure by chipping or the like; Applying a surface treatment material; Performing a facet restoration with a repair mortar material; And applying a surface protective material to the upper surface of the plaster.
The concrete structure has an alkaline pH of about 12 ~ 13 at the initial pH, and thus the stability of the structure is maintained. However, the neutralization proceeds due to the external environment and deterioration occurs.
The surface treatment material of the prior art mainly uses an emulsion polymer such as acryl, which serves to adjust the surface of the deteriorated structure. However, the surface treatment materials of the prior art are deficient in terms of restoration of the alkalinity of the concrete structure and surface strengthening performance of the deteriorated structure. Further, in the case of using the conventional surface treatment material, since the deteriorated reinforcing bars need to be separately rust-proofed, it takes a long time to perform the rust-preventive work, which is disadvantageous in that the efficiency of the process is low.
The maintenance mortar material is generally composed of a binder material, an aggregate material, a fiber reinforcing material material, and a powder made from a composition of a functional material material. The conventional repair mortar has a disadvantage that the compatibility of the other components with the fiber reinforcing material is often insufficient and the strength of the fiber reinforcing material is also insufficient.
After applying the surface treatment material to the deteriorated concrete structure and repairing the surface with the repair mortar, the surface protection material must be applied to protect the structure from external corrosive factors such as acid rain, CO 2 , SO 2 , and salt corrosion. The coating film of the surface protective material should have excellent chemical resistance such as acid resistance, alkali resistance, flame resistance, flame resistance and stain resistance, physical properties such as abrasion resistance and impact resistance, and color freely selectable. However, conventional surface treatment materials do not sufficiently satisfy the above-mentioned requirements.
SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems occurring in the prior art,
The present invention provides a repair and reinforcement method of a concrete structure including a step of performing repairing of a section by using a repair mortar material including a fiber reinforcing material remarkably excellent in tensile strength and specific components excellent in compatibility with the fiber reinforcing material do.
In the repair and reinforcement method of the concrete structure, the alkaline property of the concrete structure is restored, thereby improving the surface strengthening performance of the deteriorated structure and also providing a rust preventing effect. Thus, a separate rust- And a surface treatment step of treating the surface of the concrete structure by using the surface treatment method of the present invention.
Also, in the repair and reinforcement method of the concrete structure, it is possible to provide a surface protection material having excellent chemical resistance such as acid resistance, alkali resistance, flame resistance, flame resistance and stain resistance, physical performance such as abrasion resistance and impact resistance, And a surface protection material applying step of forming a coating film on the surface of the concrete structure.
In addition,
Reinforced concrete mortar material containing a fiber reinforcing material having remarkably high tensile strength and specific components excellent in compatibility with the fiber reinforcing material.
According to the present invention,
(a) a surface treatment step of applying a surface treatment material to the surface of a concrete structure requiring repair and reinforcement for restoration and alkalinity of the concrete structure;
(b) 35 to 45 parts by weight of Portland cement, 5 to 10 parts by weight of alumina cement, 5 to 10 parts by weight of pozzolan powder, 50 to 55 parts by weight of silica sand, 2 to 5 parts by weight of re- 0.1 to 0.3 part by weight of a viscosity stabilizer methyl cellulose, 0.2 to 0.5 part by weight of a polycarboxylic acid-based powder fluidizing agent, and 0.1 to 0.3 part by weight of an aramid fiber; And
(c) applying a surface protection material to the surface of the above-mentioned cross-sectional restoration surface.
In addition,
35 to 45 parts by weight of Portland cement, 5 to 10 parts by weight of alumina cement, 5 to 10 parts by weight of pozzolan powder, 50 to 55 parts by weight of silica sand, 2 to 5 parts by weight of re-oiled powdery resin, 0.1 to 0.3 parts by weight of methyl cellulose 0.2 to 0.5 parts by weight of a polycarbonate-based powder fluidizing agent, and 0.1 to 0.3 parts by weight of an aramid fiber.
According to the method for repairing and reinforcing concrete structures of the present invention,
Since the surface treatment material which not only improves the surface strengthening performance of the deteriorated structure remarkably by restoring the alkalinity of the concrete structure but also provides a rust prevention effect is used, the surface strengthening and the repairing and reinforcing efficiency of the concrete structure are greatly improved Processable;
Since the reinforcing mortar material containing the fiber reinforcing material remarkably excellent in the tensile strength and the specific components excellent in compatibility with the fiber reinforcing material is used, the effect of repairing and reinforcing the concrete structure by the cross-sectional restoration is remarkably increased;
Since the surface protective material is used which is excellent in the chemical resistance such as acid resistance, alkali resistance, flame resistance, flame retardancy, stain resistance, physical performance such as abrasion resistance and impact resistance, and surface protection material capable of freely selecting colors, Not only the durability of the maintenance reinforced concrete structure is remarkably improved but also the appearance of the concrete structure can be freely rendered and the appearance of the concrete structure can be repaired in the same manner as before.
In addition, since the mortar for concrete reinforcement of the present invention includes a fiber reinforcement remarkably excellent in tensile strength and specific components excellent in compatibility with the fiber reinforcement, it is possible to improve the repair and reinforcement effect of the concrete structure by the cross- And provides a remarkable lift effect.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view schematically showing a construction form of a repair and reinforcement method for a concrete structure according to the present invention. FIG.
According to the present invention,
(a) a surface treatment step of applying a surface treatment material to the surface of a concrete structure requiring repair and reinforcement for restoration and alkalinity of the concrete structure;
(b) 35 to 45 parts by weight of Portland cement, 5 to 10 parts by weight of alumina cement, 5 to 10 parts by weight of pozzolan powder, 50 to 55 parts by weight of silica sand, 2 to 5 parts by weight of re- 0.1 to 0.3 part by weight of a viscosity stabilizer methyl cellulose, 0.2 to 0.5 part by weight of a polycarboxylic acid-based powder fluidizing agent, and 0.1 to 0.3 part by weight of an aramid fiber; And
and (c) applying a surface protection material to the surface of the above-mentioned section-restoring concave surface.
The repair and reinforcement method of the present invention is characterized in that the repair mortar is performed by using the above-mentioned repair mortar material. The above-mentioned repair mortar material uses aramid fiber having a remarkably high tensile strength as a fiber reinforcing material, and has excellent compatibility between the aramid fiber and the remaining components, thereby remarkably enhancing the repairing and reinforcing effect of the concrete structure.
In the repairing and reinforcing method of the concrete structure, it is possible to further include a step of chipping the surface to be reinforced of the damaged concrete structure before the step (a) is performed, and then finishing the surface or the cross section until an undamaged portion comes out.
The process includes blasting a steel or steel surface with a sand, wire brush, grit, shot ball, or the like.
The repair mortar material has a structure including a binder portion, an aggregate portion, a fiber reinforcing portion, and a functional material portion.
First, the binder portion is composed of one kind of ordinary Portland cement, alumina cement, pozzolan powder, and re-oiling type powder resin. When these components are included in the above-mentioned content range, the property of hardening material for setting time, strength, hydration heat, shrinkage expansion And minimizes the change (generation of residual cracks, and the like).
The aggregate portion is composed of a silica sand, wherein the silica sand comprises 5 to 10 parts by weight of a silica sand having an average particle diameter of 0.1 to 0.2 mm, 25 to 35 parts by weight of a silica sand having an average particle diameter of 0.3 to 0.6 mm, And 15 to 20 parts by weight of a 1.2 mm silica sand. Since the silica sand having different particle sizes are mixed as described above, the pores can be easily controlled and the skeleton of the repair mortar layer is stabilized after the section repairing operation for the deteriorated portion.
The fiber reinforcing member is used to prevent cracking of the repair mortar composition and to improve tensile strength, and has a structure in which a fibrous reinforcement is incorporated to bridge the binder and the aggregate. In the prior art, mainly organic fibers such as polypropylene fibers and polyethylene fibers are used, and recently, natural hemp is also used.
In the present invention, aramid fibers are used as the fiber reinforcing material. Aramid fiber is a high-tech new material that is 5 times stronger than steel of the same size and has excellent fire resistance (500 ℃) and is widely used in aviation industry (spacecraft), military (armor) and firefighting. Aramid fiber is a highly functional fiber called a new material of dream, and provides excellent performance comparable to that of the prior art to the repair mortar material of the present invention.
The functional material portion is a structure for imparting a specific function to the maintenance mortar composition. As the functional material portion, the alumina cement imparts an initial hardening and developing function at the time of curing after restoration of the section of the deteriorated site. Pozzolan powder reduces the hydration heat due to hydration reaction during initial curing after application and prevents the occurrence of residual cracks at this time, and provides a function to form a stable cured product in the long term. The resuspended powdered resin is a highly elastic emulsion polymer which improves the watertightness of the cured mortar material and improves the flexural strength and tensile strength of the cured product.
The repair mortar material of the present invention may contain, in addition to the above-mentioned functional materials, additives such as polycarbonate-based powder fluidizing agents and thickening stabilizers used in cement-based compositions.
In the method for repairing and reinforcing concrete structures, the surface treatment material may include 50 to 80 parts by weight of a subject comprising 20 to 60% by weight of an epoxy resin, 10 to 40% by weight of a modified epoxy resin, and 7 to 70% by weight of a solvent; And 20 to 50 parts by weight of a curing agent comprising 5 to 40% by weight of a polyamide resin, 1 to 30% by weight of a modified amine resin and 30 to 70% by weight of a solvent are preferably used.
The surface treatment material not only significantly improves the surface strengthening performance of the deteriorated structure by restoring the alkalinity of the concrete structure, but also provides a rust prevention effect, so that the surface treatment of the reinforced concrete structure and the maintenance and repairing efficiency can be greatly improved .
As the epoxy resin, a bisphenol-A type epoxy resin may be typically used. As the modified epoxy resin, a self-emulsifying modified epoxy resin may be used.
Typical examples of the polyamide resin of the hardener part include H-4121 (manufactured by Kukdo Chemical Co., Ltd.), and a typical example of the modified amine resin is K-54 (manufactured by Kukdo Chemical Co., Ltd.).
A mixed solvent of an organic solvent and water may be preferably used as the solvent used for the main portion or the curing agent portion. The organic solvent is not particularly limited, but is preferably used in combination with water. Typical examples thereof include acetic acid cellosolve and isopropyl alcohol (IPA). The mixing weight ratio of the organic solvent and water is preferably in the range of 3: 7 to 7: 3.
The epoxy equivalent of the epoxy resin contained in the main portion is preferably 180 to 190, and the epoxy equivalent of the self-emulsifying modified epoxy resin is preferably 210 10. The amine value of the polyamide resin in the curing agent part is preferably 330 to 20, and the amine value of the modified amine resin is preferably about 345 to 385.
When the two-component components of the main portion and the curing agent portion are mixed, the surface treatment agent becomes a milky white liquid aqueous alkaline aqueous epoxy polymer having a pH of 10 to 12. Because of its alkaline pH of 10 ~ 12, it is chemically stable with alkaline concrete surface with pH 13, and maximizes affinity with concrete surface, so it has a strong adhesion with concrete. In addition, the surface treatment agent of the present invention absorbs cement powder, dust and the like on the surface of the concrete, and functions as a material for the concrete ground adjustment work, which is the next step, to exhibit a strong adhesion force to the concrete surface.
Wherein the surface protection material comprises 45 to 55% by weight of a ceramic resin containing R-OH functional groups, 30 to 40% by weight of a coloring pigment oxide (TiO 2 ), and 15 to 25% by weight of a solvent 60 to 75 parts by weight of a subject containing% And 15 to 25 parts by weight of a curing agent containing 50 to 65% by weight of a non-yellowing urethane resin containing R-NCO functional groups and 35 to 50% by weight of a solvent are preferably used.
In the ceramic resin containing the R-OH functional group, R means a linear or branched alkyl group having 10 to 20 carbon atoms. Representative examples of the ceramic resin containing the R-OH functional group include methyl silicate, ethyl silicate and the like.
In the non-halogenated urethane resin containing the R-NCO functional group, R means a linear or branched alkyl group having 10 to 20 carbon atoms. A representative example of the non-yellowing urethane resin containing an R-NCO functional group is DN-980S (hexamethylene diisocyanate from Polyisocyanate (HDI)).
An organic solvent may be preferably used as the solvent used in the main part or the curing agent part. The organic solvent is not particularly limited, and representative examples thereof include acetic acid cellosolve and the like.
In addition, in the repairing and reinforcing method of the concrete structure, the surface protection material may include 50 to 65 wt% of an epoxy resin or a modified epoxy resin, 25 to 40 wt% of a coloring pigment oxide (TiO 2 ) and 2 to 10 wt% , And 25 to 35 parts by weight of a curing agent comprising 30 to 70% by weight of a polyamide resin and 30 to 70% by weight of a modified amine resin are mixed with the epoxy resin-based surface protective material Can be used.
As the epoxy resin of the main part, a bisphenol-A type epoxy resin can be used. As the modified epoxy resin, a modified bisphenol-A type epoxy resin can be exemplified, and a resin having an epoxy equivalent of 185 to 190 Can be preferably used. Specifically, yd-128 resin manufactured by Kukdo Chemical Co., Ltd. can be used.
Examples of the additive include a dispersant, a defoaming agent, and a reactive diluent.
Typical examples of the polyamide resin of the curing agent part include polyamidoamine resin, and an amine value of 300 20 is preferably used. Specifically, Kukdo Chemical Co., Ltd. G-A0533 resin Etc. may be used.
Representative examples of the modified amine resins include aliphatic amines having an amine value of 345 to 385 and can be used without any particular limitation. Specific examples thereof include H-3893 resin manufactured by Kukdo Chemical Co., Ltd.
In the repair and reinforcement method of the concrete structure, the surface protecting materials as the finishing material are excellent in the chemical resistance such as acid resistance, alkali resistance, flame resistance, flame resistance and stain resistance, physical performance such as abrasion resistance and impact resistance, And has a feature that can be selected. Accordingly, not only the durability of the reinforced concrete structure is remarkably improved but also the appearance of the concrete structure can be freely rendered, so that the appearance of the concrete structure can be remedied as it is.
The present invention also relates to
35 to 45 parts by weight of Portland cement, 5 to 10 parts by weight of alumina cement, 5 to 10 parts by weight of pozzolan powder, 50 to 55 parts by weight of silica sand, 2 to 5 parts by weight of re-oiled powdery resin, 0.1 to 0.3 parts by weight of methyl cellulose 0.2 to 0.5 parts by weight of a polycarboxylic acid-based powder fluidizing agent, and 0.1 to 0.3 parts by weight of an aramid fiber, which are used in repair and reinforcement of a concrete structure.
The above-mentioned repair mortar material uses aramid fiber having a remarkably high tensile strength as a fiber reinforcing material, and has excellent compatibility between the aramid fiber and the remaining components, thereby remarkably enhancing the repairing and reinforcing effect of the concrete structure.
As for the above-mentioned repair mortar material, all of the contents described above can be applied.
In the present invention, each of the surface treatment material, the repair mortar material, and the surface protective material may further include known components commonly used in this field.
Hereinafter, the present invention will be described in more detail by way of examples. However, the following examples are intended to further illustrate the present invention, and the scope of the present invention is not limited by the following examples. The following examples can be appropriately modified and changed by those skilled in the art within the scope of the present invention.
Example One: Conservative mortar Produce
40 parts by weight of Portland cement, 7 parts by weight of alumina cement, 7 parts by weight of pozzolan powder, 52 parts by weight of silica sand, 3 parts by weight of re-oiling type resin, 0.2 parts by weight of methyl cellulose thickening stabilizer, 0.3 part by weight of polycarboxylic acid- And 0.2 part by weight of aramid fiber were mixed to prepare a maintenance mortar material.
Example 2: Surface treated ash Produce
20 wt% of a self-emulsifying modified epoxy resin (manufactured by Kukdo Chemical Co., Ltd., trade name: KEM-128M), 40 wt% of a bisphenol-A type epoxy resin (trade name: KODO CHEMICAL CO. 50 to 80 parts by weight of a subject comprising 40 wt% of a solvent mixture of phosphoric acid cellulose and water in a weight ratio of 50:50; 20% by weight of a polyamide resin (trade name: Hokudo Chemical Co., Ltd., trade name: H-4121), 20% by weight of a modified amine resin (trade name: Kukdo Chemical Co., : 80 by weight, and 20 to 50 parts by weight of a curing agent containing 60% by weight of a solvent mixed to prepare a surface treatment material.
Example 3: Of surface protection material Produce
60 to 75 parts by weight of a ceramic resin containing 45% by weight of methyl silicate, 35% by weight of a coloring pigment oxide (TiO 2 ) and 20% by weight of an organic solvent of cellulose acetate as a ceramic resin containing R-OH functional groups; And 15 to 25 parts by weight of a curing agent containing 60% by weight of a non-yellowing urethane resin containing a R-NCO functional group (manufacturer: Aekyung Chemical Co., Ltd., trade name: DN-980S) and 40% by weight of organic solvent acetosilicate, A protective material was prepared.
Test Example One: Conservative mortar Performance evaluation
To evaluate the performance of the repair mortar material prepared in Example 1, 16 to 18 parts by weight of water was mixed with 100 parts by weight of the repair mortar composition powder prepared in Example 1, cured for 28 days, and then KS F 4042 " Mortar " test method. The test results are shown in Table 1 below.
From the test results of Table 1, it can be seen that the repair mortar material of Example 1 of the present invention exhibits an effect exceeding the physical properties required in all the measurement items. Particularly, the effect was more remarkable in terms of compressive strength, adhesion strength, alkali resistance, water permeability, and the like.
Test Example 2: Surface treated ash Performance evaluation
In order to evaluate the performance of the surface treatment material prepared in Example 2, the surface treatment material of Comparative Example 1 (manufactured by Mitsutoshi M-Tech, trade name: Lappingtte) purchased in the market and the pH of the surface treatment material prepared in Example 2 And rust prevention performance were evaluated. The results are shown in Table 2 below.
Alkaline restoration of neutralized structures
From the test results shown in Table 2, the surface treatment material of the present invention is alkaline with a pH of 10 to 12, and thus restores alkalinity to the surface of the concrete structure which has deteriorated and has been neutralized, and the coating film is hardened by chemical bonding between the surface and the hardener It is confirmed that the surface of the deteriorated structure is strengthened and a separate rustproofing work is unnecessary.
Test Example 3: Of surface protection material Performance evaluation
In order to evaluate the performance of the surface protection material prepared in Example 3, the performance of the surface protection material prepared in Example 3 was tested by KS F 4936 "Concrete protection coating material" test method, and the results are shown in Table 3 .
Each of the required properties was evaluated according to the test method as shown in Table 4, and the results are shown in Table 4.
From the test results shown in Tables 3 and 4, it can be seen that the surface protecting material of Example 3 of the present invention exhibits an effect exceeding the physical properties required in all the measurement items.
Example 4: Implementation of repair and reinforcement method of concrete structure
The surface or section of the damaged concrete structure was chipped until the undamaged portion was removed, and the rust of the reinforced concrete was removed with a wire brush. Next, the surface treatment material prepared in Example 2 was applied to the damaged area and dried. After the coating film of the surface treatment material was dried, a repair mortar was made thereon using the repair mortar material prepared in Example 1. After the above-mentioned surface repair material was completely dried, the surface protection material prepared in Example 3 was applied to the surface and dried to complete the repair and reinforcement of the damaged concrete structure.
In the case of the concrete structure repaired by the repair and reinforcement method, as described above, each of the surface treatment material, the repair mortar material, and the surface protective material provides excellent physical properties individually, and the compatibility and bondability The reinforced concrete structure showed excellent strength, durability, impact resistance and chemical resistance.
1: Surface treatment section
2: Surface treatment repainting film
3: Reinforced concrete mortar
4: Surface protection coating film
Claims (5)
(b) 35 to 45 parts by weight of Portland cement, 5 to 10 parts by weight of alumina cement, 5 to 10 parts by weight of pozzolan powder, 50 to 55 parts by weight of silica sand, 2 to 5 parts by weight of re- 0.1 to 0.3 part by weight of a viscosity stabilizer methyl cellulose, 0.2 to 0.5 part by weight of a polycarboxylic acid-based powder fluidizing agent, and 0.1 to 0.3 part by weight of an aramid fiber; And
(c) applying a surface protective material to the surface of the cross-sectional restoration surface,
Wherein the surface treatment material comprises 50 to 80 parts by weight of a subject comprising 20 to 60% by weight of an epoxy resin, 10 to 40% by weight of a modified epoxy resin, and 7 to 70% by weight of a solvent; And 20 to 50 parts by weight of a curing agent comprising 5 to 40% by weight of a polyamide resin, 1 to 30% by weight of a modified amine resin and 30 to 70% by weight of a solvent,
The surface protection material is preferably 60 to 75 parts by weight of a subject comprising 45 to 55% by weight of a ceramic resin containing R-OH functional groups, 30 to 40% by weight of a coloring pigment oxide (TiO 2 ), and 15 to 25% ; And 15 to 25 parts by weight of a curing agent comprising 50 to 65% by weight of a non-yellowing urethane resin containing an R-NCO functional group and 35 to 50% by weight of a solvent, wherein R is a linear or branched two-component surface on the group of coating of the protective material, or an epoxy resin or a modified epoxy resin, 50 ~ 65% by weight, the color pigment oxide per (TiO 2) subject 56 to containing 25-40% by weight and additives 2-10% by weight Of a curing agent comprising 30 to 70% by weight of a polyamide resin and 30 to 70% by weight of a modified amine resin. Repair and Rehabilitation of Structures.
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| KR101719486B1 (en) | 2016-08-16 | 2017-03-24 | 네오건설화학 주식회사 | Waterproof mortar composition and method for waterproofing therewith |
| KR102000219B1 (en) * | 2018-11-01 | 2019-07-15 | (주)제이엔티아이엔씨 | Maintenance method of road gutter using polymer mortar |
| KR102067736B1 (en) | 2019-06-20 | 2020-02-11 | 주식회사 태일케미칼 | Repair-reinforcement method for concrete structure using base coating material containing functional-aqueous epoxy, polymer mortar containing aramid fibers and surface protectant containing nano-size silver |
| KR20200016104A (en) | 2018-08-06 | 2020-02-14 | 지엘기술주식회사 | Repair-reinforcement method for concrete structure using polymer mortar comprising aramid fibers, and antibacterial and functional surface protectant containing nano-size silver |
| KR102279023B1 (en) | 2020-12-15 | 2021-07-19 | (주)엔텍 | Graphene mortar for concrete maintenance, paint of preventing neutralization and maintenance method of concrete |
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| KR102279023B1 (en) | 2020-12-15 | 2021-07-19 | (주)엔텍 | Graphene mortar for concrete maintenance, paint of preventing neutralization and maintenance method of concrete |
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