CN112627571A - Hard FRP grid/ECC double-faced adhesive tape type restrained reinforced concrete column and preparation method thereof - Google Patents
Hard FRP grid/ECC double-faced adhesive tape type restrained reinforced concrete column and preparation method thereof Download PDFInfo
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- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/30—Columns; Pillars; Struts
- E04C3/34—Columns; Pillars; Struts of concrete other stone-like material, with or without permanent form elements, with or without internal or external reinforcement, e.g. metal coverings
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- 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
- E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
- E04G23/0225—Increasing or restoring the load-bearing capacity of building construction elements of circular building elements, e.g. by circular bracing
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00034—Physico-chemical characteristics of the mixtures
- C04B2111/00146—Sprayable or pumpable mixtures
- C04B2111/00155—Sprayable, i.e. concrete-like, materials able to be shaped by spraying instead of by casting, e.g. gunite
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00482—Coating or impregnation materials
- C04B2111/00508—Cement paints
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00637—Uses not provided for elsewhere in C04B2111/00 as glue or binder for uniting building or structural materials
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/28—Fire resistance, i.e. materials resistant to accidental fires or high temperatures
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- 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
- E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
- E04G2023/0251—Increasing or restoring the load-bearing capacity of building construction elements by using fiber reinforced plastic elements
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Abstract
The invention discloses a hard FRP grid/ECC double-faced adhesive tape type restrained reinforced concrete column and a preparation method thereof. According to the method, the bonding strength between the FRP grid/ECC and the RC beam is improved by coating the epoxy resin adhesive between the FRP grid/ECC and the RC beam. FRP grid/ECC reinforcement is an effective method for reinforcing RC column, FRP can provide constraint force, so that the internal concrete is in a three-dimensional compression state, and the strength and ductility of the core concrete are greatly increased. The foundation of the cooperative work of the reinforcing layer and the reinforced layer is that the reinforcing layer and the reinforced layer have good bonding effect, but the bonding strength is weakened by serious surface damage and cracks or large cracks caused by the failure of unloading. The epoxy resin glue can be soaked into new and old concrete to strengthen the interface and improve the bonding strength at the interface. Meanwhile, the FRP is restrained by spraying the ECC coating, so that the damage of harmful ions can be effectively resisted, and the problem of aging of the binder is solved.
Description
Technical Field
The invention relates to the field of concrete structure reinforcement, in particular to a rigid FRP grid/ECC double-faced adhesive tape type restrained reinforced concrete column and a preparation method thereof.
Background
The column among the reinforced concrete structure is that the structure is the important vertical component in the structure, plays and undertakes and transmits vertical load, also must bear the horizontal effect simultaneously, but in long-term use, can meet adverse circumstances, natural disasters such as earthquake, conflagration effect, a large amount of reinforced concrete columns appear that the reinforcing bar corrosion is serious, the crack is too much, the fishing rate is too big, durability, suitability and security problems such as bearing capacity are not enough. From the development process of the European and American countries, the method adopting reinforcement and repair is occupying an increasingly large proportion. Therefore, the color fading of the 'great civil engineering' era in China can be expected, various effective reinforcing and reforming measures are researched, the bearing capacity of the damaged reinforced concrete column structure is recovered and improved, the damaged reinforced concrete column structure is suitable for higher bearing requirements, and the requirement of new use functions is very important.
At present, the common reinforcing methods for reinforced concrete columns include a carbon fiber cloth reinforcing method, an enlarged cross section reinforcing method, an externally-wrapped steel reinforcing method and the like. The reinforced concrete column is reinforced by the externally bonded FRP cloth, and has the outstanding advantages of light weight, high strength, strong designability, light dead weight, convenience in construction, small influence on the appearance of the structure, good corrosion resistance and the like. For the external adhesion FRP cloth reinforcing technology, the adhesion effect of the FRP cloth and the reinforced structure concrete surface mainly depends on an adhesive, and the adhesive is a high molecular polymer prepared by taking epoxy resin as a matrix. The organic adhesive is very sensitive to damp heat, dry-wet cycle, salt fog, high temperature and other environments. Because the concrete structure needing to be reinforced is in a severe environment, the bonding strength of the FRP reinforcing system is seriously degraded in a severe service environment. Once the FRP reinforcement system and the existing concrete are bonded to fail, the reinforcement effect is lost, and the existing structure is in a more dangerous state. Therefore, it is necessary to properly solve the problem of durability due to the deterioration of the adhesive at the interface between the FRP and the reinforced concrete.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a rigid FRP grid/ECC double-faced adhesive tape type restrained reinforced concrete column and a preparation method thereof.
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
in a first aspect, the invention provides a rigid FRP grid/ECC double faced adhesive tape type restrained reinforced concrete column, which is characterized in that: the reinforced FRP grid comprises reinforced columns, a bonding agent, a composite material and a hard FRP grid; the preparation method comprises the following steps:
coating a bonding agent on the outer surface of the reinforced column before reinforcing to form a template, placing a hard FRP grid between the template and the reinforced column, pumping a composite material, and wrapping the FRP grid to form a reinforced whole so as to obtain the FRP/ECC double-faced adhesive type restrained reinforced damaged reinforced concrete column;
the FRP grids are wrapped and restrained by the composite material; the adhesive is coated between the FRP grid/ECC and the reinforced column so as to improve the adhesive strength between the FRP grid/ECC and the reinforced column, prevent the reinforcing layer from slipping and ensure the three-dimensional compression of the internal concrete; the adhesive can be soaked into concrete to strengthen the interface and improve the adhesive strength at the interface.
In a second aspect, the invention provides a preparation method of the rigid FRP grid ECC double-faced adhesive tape type restrained reinforced concrete column, which is characterized in that: the method improves the bonding strength between the FRP grid/ECC and the existing concrete slab by smearing the bonding agent between the FRP grid/ECC and the existing concrete slab; the adhesive can be soaked into concrete to strengthen the interface and improve the adhesive strength at the interface; the method comprises the following steps:
1) before reinforcement, coating an adhesive on the outer surface of the reinforced column, and supporting a template;
2) then placing the hard FRP grid between the template and the reinforced column;
3) and finally pumping the composite material to wrap the FRP grids to form a reinforced whole.
As a preferred scheme, the composite material is an ultrahigh-toughness cement-based composite material, and the weight ratio of each component to cement is 1.6-2.0 of fly ash; 1.0-1.1 parts of 80-120-mesh quartz sand; 0.6-0.9 parts of water; water reducing agent: 0.01-0.013; PVA: 0.04-0.06.
Further, the FRP grid is a hard CFRP grid.
Further, the adhesive is an epoxy glue.
The method has the advantages that the FRP can provide a restraining force, so that the internal concrete is in a three-dimensional compression state, and the strength and ductility of the core concrete are greatly increased. In order to ensure the effective restraint of FRP, the bond strength at the interface needs to be increased. The adhesive can be soaked into concrete to strengthen the interface and improve the adhesive strength at the interface. Therefore, the method improves the bonding strength between the FRP grid/ECC and the existing concrete column by smearing the bonding agent between the FRP grid/ECC and the existing concrete column, prevents the reinforcing layer from slipping, and ensures that the internal concrete is pressed in three directions.
The working principle of the invention is as follows:
the epoxy resin glue can be infiltrated into new and old concrete, and forms giant molecules with a three-dimensional network structure under the action of a curing agent, so that the bonding at the interface is strengthened. Although epoxy adhesives provide reliable bonding, such organic adhesives are very sensitive to hot and humid environments, dry and wet cycles, salt spray, high temperatures, etc., resulting in poor durability. The characteristics of high temperature resistance and small cracks of the ultra-high toughness cement-based composite material can increase the fire resistance of the structure and the erosion resistance of harmful ions such as chloride ions and the like; in addition, the ultimate tensile strain can exceed 3%, and the FRP grid is wrapped and restrained by taking the FRP grid as an interface adhesive and a reinforcing material, so that the problem that the FRP is easy to peel off due to aging of the interface adhesive of the externally-adhered FRP sheet is solved. Therefore, one side of the FRP grid is coated with epoxy resin glue and fixed on the outer surface of the column, and then coated with ECC, so that the durability of the epoxy resin glue can be improved, the cooperative work with the FRP material can be ensured, the mechanical properties of the two materials can be fully exerted, and multiple effects of improving the stress performance, the durability and the fire resistance can be realized.
The invention has the advantages and beneficial effects that:
the FRP can provide a restraining force to enable the internal concrete to be in a three-dimensional compression state, so that the strength and ductility of the core concrete are greatly increased. The foundation for the cooperation of the reinforcing layer and the reinforced layer is that the reinforcing layer and the reinforced layer have good bonding effect, but the bonding strength is weakened due to serious surface damage and cracks or large cracks caused by unloading failure, and the like, and the slippage of the reinforcing layer is caused due to the weak bonding strength, particularly in a biasing member. According to the invention, the FRP grid replaces an FPX sheet, so that the problem that the ultrahigh-toughness cement-based composite material cannot completely permeate the FRP sheet and generate enough interface bonding strength is solved; the epoxy resin adhesive is coated on the interface to strengthen the interface and improve the bonding strength of the interface, and then the ECC material is coated in the interface by spraying, so that the characteristics of high temperature resistance and small cracks of the ECC material can be exerted, the fire resistance of the structure and the corrosion resistance of harmful ions such as chloride ions can be increased, the durability of the epoxy resin adhesive is improved, meanwhile, the excellent tensile property of the epoxy resin adhesive can ensure the cooperative work with the FRP material, the mechanical properties of the two materials are fully exerted, and multiple effects of improving the stress performance, the durability and the fire resistance are realized.
Drawings
FIG. 1 is a schematic cross-sectional view of a FRP/ECC double-faced adhesive tape type restrained reinforced concrete column;
FIG. 2 is a schematic view of a FRP/ECC reinforced column showing cracks.
In the figure: 1. reinforced column, 2, epoxy glue, 3, hard FRP grid, 4, ECC, 5, crack, 6, template.
Detailed Description
The invention is explained in further detail below with reference to the figures and the specific embodiments.
As shown in fig. 1, the invention provides a preparation method of a rigid FRP grid ECC double-faced adhesive type restrained reinforced concrete column. The concrete used to cast the post was C30 concrete. The column was 200mm in diameter and 500mm high. Before reinforcement, firstly, a layer of adhesive 2 is coated along the outer surface of the reinforced column 1, then the FRP grid 3 is fixed on the reinforced column 1, and finally, the composite material 4 is sprayed, and the FRP grid 3 is wrapped to form a reinforced whole.
The composite material 4 is an ultrahigh-toughness cement-based composite material, and is characterized in that: the weight ratio of each component to the cement is 1.6-2.0 of fly ash; 1.0-1.1 parts of 80-120-mesh quartz sand; 0.6-0.9 parts of water; water reducing agent: 0.01-0.013; PVA: 0.04-0.06; the FRP grid 3 is a hard CFRP grid; the binder 2 is epoxy resin glue.
Column 1(Z1) is an unreinforced column and column 2(Z2) is a reinforced column.
| Column | Yield load KN | Ultimate load KN |
| Column 1 | 467 | 670 |
| Column 2 | 570 | 817 |
The FRP grid/ECC is adopted to reinforce the column, and the bearing capacity is improved by 10-15%. The bearing capacity of the preparation method for restraining and reinforcing the damaged reinforced concrete column by adopting the hard FRP grid ECC double-faced adhesive tape type can be improved by 20-30%.
During the construction process, the control of the key links is required, and the control is divided into two aspects of materials and construction. Firstly, in terms of materials, the thickness of an FRP grid and the size of the grid size are selected according to actual needs; the preparation of the ultra-high toughness cement-based composite material is carried out according to the proportion and the feeding sequence strictly, so that the ultra-high toughness cement-based composite material is ensured to be reliably bonded with concrete and can be coordinated with the original concrete column for deformation. Secondly, in the construction link, firstly coating epoxy resin glue on the outer surface of the reinforced column, then supporting a template, placing the FRP grid between the template and the reinforced column, and pumping the ultrahigh-toughness cement-based composite material; the required overlapping length is required to be met during overlapping, both ends of the overlapping section are fixed firmly by using an anchor, and the overlapping part is prevented from becoming a weak part.
Claims (6)
1. The utility model provides a impaired reinforced concrete column is consolidated in restraint of stereoplasm FRP net/ECC double faced adhesive tape formula which characterized in that: comprises a reinforced column (1), a bonding agent (2), a composite material (4) and a hard FRP grid (3); the preparation method comprises the following steps:
the method comprises the steps that cracks (5) exist on the outer surface of a reinforced column (1), a bonding agent (2) is coated on the outer surface of the reinforced column (1) before reinforcement, a template (6) is well supported, a hard FRP grid (3) is placed between the template (6) and the reinforced column (1), finally a composite material (4) is pumped, the FRP grid (3) is wrapped inside to form a reinforced whole, and therefore the FRP/ECC double-faced adhesive type restrained reinforced concrete column is obtained;
the FRP grid (3) is wrapped and restrained by the composite material (4); the adhesive (2) is coated between the FRP grid/ECC and the reinforced column (1) so as to improve the adhesive strength between the FRP grid/ECC and the reinforced column (1), prevent the reinforcing layer from slipping and ensure that the internal concrete is compressed in three directions; the binder (2) can be soaked into concrete to strengthen an interface and improve the binding strength at the interface.
2. The method for preparing the ECC double-faced adhesive type restrained reinforced concrete column with the hard FRP grid according to claim 1, which is characterized by comprising the following steps: the method improves the bonding strength between the FRP grid/ECC and the existing concrete slab by smearing the bonding agent between the FRP grid/ECC and the existing concrete slab; the adhesive can be soaked into concrete to strengthen the interface and improve the adhesive strength at the interface; the method comprises the following steps:
1) before reinforcement, firstly coating an adhesive (2) on the outer surface of a reinforced column (1) and supporting a template (6);
2) then, the hard FRP grid (3) is arranged between the template (6) and the reinforced column (1);
3) and finally, pumping the composite material (4) to wrap the FRP grid (3) to form a reinforced whole.
3. The method for preparing the rigid FRP grid ECC double faced adhesive tape type restrained reinforced concrete column as claimed in claim 2, wherein the method comprises the following steps: the composite material (4) is an ultrahigh-toughness cement-based composite material, and the weight ratio of each component to cement is 1.6-2.0 of fly ash; 1.0-1.1 parts of 80-120-mesh quartz sand; 0.6-0.9 parts of water; water reducing agent: 0.01-0.013; PVA: 0.04-0.06.
4. The method for preparing the rigid FRP grid ECC double faced adhesive tape type restrained reinforced concrete column as claimed in claim 2 or 3, wherein the method comprises the following steps: the FRP grid (3) is a hard CFRP grid.
5. The method for preparing the rigid FRP grid ECC double faced adhesive tape type restrained reinforced concrete column as claimed in claim 2 or 3, wherein the method comprises the following steps: the binder (2) is epoxy resin glue.
6. The method for preparing the rigid FRP grid ECC double faced adhesive tape type restrained reinforced concrete column as claimed in claim 4, wherein the method comprises the following steps: the binder (2) is epoxy resin glue.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011412712.6A CN112627571A (en) | 2020-12-03 | 2020-12-03 | Hard FRP grid/ECC double-faced adhesive tape type restrained reinforced concrete column and preparation method thereof |
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| CN202011412712.6A CN112627571A (en) | 2020-12-03 | 2020-12-03 | Hard FRP grid/ECC double-faced adhesive tape type restrained reinforced concrete column and preparation method thereof |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103496865A (en) * | 2013-09-16 | 2014-01-08 | 北京工业大学 | Hybrid FRP (Fiber Reinforced Plastic) grid enhancedreinforced ECC (Engineered Cementitious Composite) and application thereof tostructure for reinforcing concrete structure |
| CN106431132A (en) * | 2016-09-07 | 2017-02-22 | 西安建筑科技大学 | High-ductility fiber concrete and construction method for reinforcing beam by using high-ductility fiber concrete |
| JP2019094695A (en) * | 2017-11-24 | 2019-06-20 | 大成建設株式会社 | Earthquake resistant strengthening method and carbon fiber panel |
| CN110256014A (en) * | 2019-06-27 | 2019-09-20 | 中国矿业大学 | A kind of FRP grid reinforcing complex cement base binding material and preparation method thereof |
| CN111608415A (en) * | 2020-05-13 | 2020-09-01 | 武汉大学 | Square steel tube concrete column reinforcing method based on high-ductility cement-based material |
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- 2020-12-03 CN CN202011412712.6A patent/CN112627571A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103496865A (en) * | 2013-09-16 | 2014-01-08 | 北京工业大学 | Hybrid FRP (Fiber Reinforced Plastic) grid enhancedreinforced ECC (Engineered Cementitious Composite) and application thereof tostructure for reinforcing concrete structure |
| CN106431132A (en) * | 2016-09-07 | 2017-02-22 | 西安建筑科技大学 | High-ductility fiber concrete and construction method for reinforcing beam by using high-ductility fiber concrete |
| JP2019094695A (en) * | 2017-11-24 | 2019-06-20 | 大成建設株式会社 | Earthquake resistant strengthening method and carbon fiber panel |
| CN110256014A (en) * | 2019-06-27 | 2019-09-20 | 中国矿业大学 | A kind of FRP grid reinforcing complex cement base binding material and preparation method thereof |
| CN111608415A (en) * | 2020-05-13 | 2020-09-01 | 武汉大学 | Square steel tube concrete column reinforcing method based on high-ductility cement-based material |
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