CN112627572A - One-way FRP grid/ECC permeation type reinforced concrete beam for reinforcing damage and preparation method thereof - Google Patents
One-way FRP grid/ECC permeation type reinforced concrete beam for reinforcing damage 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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- E04C3/20—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of concrete or other stone-like material, e.g. with reinforcements or tensioning members
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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
- E04G23/0244—Increasing or restoring the load-bearing capacity of building construction elements of beams at places of holes, e.g. drilled in them
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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
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- 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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- 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 unidirectional FRP grid/ECC permeable reinforced concrete beam and a preparation method thereof. The method improves the bonding strength between the unidirectional FRP grid/ECC and the RC beam by spraying the concrete reinforcing agent of the high-activity fluorine-titanium substance between the unidirectional FRP grid/ECC and the RC beam. For the RC beam with serious cracks on the surface or large cracks caused by unloading, the crack part after FRP grid/ECC reinforcement has larger stripping stress along the normal direction of the interface. Once the peel stress is greater than the bond strength between the reinforcing layer and the RC beam, the reinforcing layer may peel off resulting in failure of the reinforcement. The reinforcing agent sprayed with the high-activity titanium fluoride can effectively permeate into cracks of concrete, reacts with free calcium ions in old concrete to generate insoluble gel, and nails the reinforcing layer on a reinforced structure like an anchor bolt, so that the interface bonding strength is effectively increased, and the reinforcing layer is prevented from peeling off and falling off.
Description
Technical Field
The invention relates to the field of concrete structure reinforcement, in particular to an FRP/ECC permeable reinforced concrete beam and a method thereof.
Background
The reinforced concrete beam plate structure is one of the most common structural forms in civil engineering, but in the long-term use process, the reinforced concrete beam plate structure can be subjected to the natural disasters such as severe environment, earthquake, fire and the like, and the structure bearing load is continuously increased or the use function is changed. The problems of durability, applicability and safety such as serious corrosion of reinforcing steel bars, excessive cracks, overlarge fishing rate, insufficient bearing capacity and the like occur in a large number of reinforced concrete beam plate structures. 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 beam plate structure is recovered and improved, the reinforced concrete beam plate structure is suitable for higher bearing requirements, and the requirement of new use functions is very important.
At present, commonly used reinforcing and modifying methods include a crack repairing method, a steel bonding reinforcing method, an external bonding FRP reinforcing method and the like. The externally bonded FRP reinforced concrete structure has the outstanding advantages of light weight, high strength, strong designability, light dead weight, convenient construction, small influence on the appearance of the structure, good corrosion resistance and the like. In the conventional external adhesion FRP reinforcement technology, the adhesion between the FRP sheet or plate and the reinforced structure concrete surface mainly depends on an adhesive, and the adhesive is a high molecular polymer made of epoxy resin as a matrix, and the adhesive has high environmental requirements, but the reinforcement environment is usually severe, so that the durability problem exists. In order to solve the durability problem, a method for FRP grid/ECC composite reinforcement is proposed. The ECC material has the characteristics of high temperature resistance and small cracks, so that the capability of resisting harmful ion erosion is improved, the excellent tensile property of the ECC material can ensure the cooperative work with the FRP material, and multiple effects of improving the stress performance, the durability and the fire resistance performance are realized. However, when the surface of the member is damaged and cracks are generated, and the surface of the member cannot be unloaded, large cracks are generated, and the interface bonding strength is seriously influenced. Research shows that the reinforcing layer of the reinforced concrete member with large damage falls off due to low interface bonding strength.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a unidirectional FRP grid/ECC permeable reinforced concrete beam 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 unidirectional FRP mesh/ECC penetration reinforced damaged reinforced concrete beam, which is characterized in that: the reinforced concrete composite material comprises a reinforced beam, a concrete reinforcing agent, a composite material and a unidirectional FRP grid; the preparation method comprises the following steps:
the method comprises the following steps that cracks exist on the tension side of a reinforced beam, a layer of concrete reinforcing agent is sprayed on the tension side of the reinforced beam before reinforcement, unidirectional FRP grids are fixed to the tension side, and finally a composite material is sprayed on the tension side to form a reinforced whole, so that the FRP/ECC permeable reinforced concrete beam is obtained;
the unidirectional FRP grids are wrapped and restrained by the composite material; the concrete reinforcing agent is sprayed between the FRP grid/ECC and the reinforced beam so as to improve the bonding strength between the FRP grid/ECC and the reinforced beam; the concrete reinforcing agent penetrates into cracks between the FRP grid/ECC and the reinforced beam to generate insoluble gel, and the gel plays the same role as an anchor bolt to pin the reinforcing layer on the reinforced beam.
In a second aspect, the present invention provides a method for reinforcing a damaged reinforced concrete beam by using the unidirectional FRP mesh/ECC penetration method, wherein the method comprises:
the method improves the bonding strength between the FRP grid/ECC and the existing concrete beam by spraying a concrete reinforcing agent between the FRP grid/ECC and the existing concrete beam; the concrete reinforcing agent permeates into cracks to generate insoluble gel, and plays the same role as an anchor bolt to pin the reinforcing layer on the reinforced beam; the method comprises the following steps:
1) before reinforcing, a layer of concrete reinforcing agent is sprayed on the tensile side of the reinforced beam;
2) fixing the FRP grids to the tension side;
3) and finally, spraying the composite material on the tension side 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 1.5-2.0 of fly ash; 1.0-1.1 parts of 80-120-mesh quartz sand; 0.6-1.0 parts of water; water reducing agent: 0.01-0.02; PVA: 0.04-0.07.
Furthermore, the longitudinal direction of the unidirectional FRP grid is CFRP, and the transverse direction of the unidirectional FRP grid is GFRP.
Furthermore, the concrete reinforcing agent is any one of a concrete reinforcing agent containing a high-activity fluorine titanium substance, a concrete reinforcing agent containing magnesium fluosilicate and a concrete reinforcing agent obtained by diluting ethyl silicate and ethanol according to the volume ratio of 1:1.
The working principle of the invention is as follows:
ca (OH) in fully hydrated set cement2About 20%, taking into account the use of Ca (OH)2React with the inclusions to form insoluble gels and thereby increase the bond strength at the interface of the FRP grid/ECC with the existing concrete beam. The concrete reinforcing agent has certain permeability, the effective permeability can reach 3-8mm, and the concrete reinforcing agent can be mixed with Ca (OH)2The reaction produces an insoluble gel that pins the reinforcing layer to the structure to be reinforced like an anchor bolt. Therefore, a layer of existing concrete reinforcing agent can be sprayed between the FRP grid/ECC and the existing beam to further improve the bonding strength at the interface. The ultra-high toughness cement-based composite material has the ultimate tensile strain exceeding 3 percent, is used as an interface binder and a reinforcing material to wrap and restrain an FRP grid, and solves the problem that FRP is easy to peel off due to aging of interface adhesive of an externally-bonded FRP sheet. Meanwhile, the ECC material has the characteristics of high temperature resistance and small cracks, so that the fire resistance of the structure can be improved, and the structure can resist the invasion of harmful ions such as chlorine ionsThe corrosion resistance and the excellent tensile property 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.
The invention has the following advantages and beneficial effects:
the FRP grid/ECC reinforced damaged reinforced concrete beam is characterized in that FRP sheet materials in the traditional externally-attached FRP reinforced concrete structure technology replace FRP grids; the method for wrapping and restraining the FRP by using the ultra-high-toughness cement-based composite material (ECC) without using an organic adhesive. But the surface is seriously damaged and cracks exist, and when the surface cannot be unloaded, the surface is also severely damaged and cracks exist, and the bonding strength at the interface is seriously influenced. According to the invention, the concrete reinforcing agent is sprayed between the FRP grid/ECC and the existing concrete beam, so that the bonding strength between the FRP grid/ECC and the existing concrete beam is improved. The concrete reinforcing agent can penetrate into cracks to generate insoluble gel, and the reinforcing layer is nailed on the reinforced beam like an anchor bolt, so that the interface bonding strength is increased, and the reinforcing method can still be used under the condition of large damage and large cracks.
Drawings
FIG. 1 is a schematic view of a FRP/ECC permeable reinforced damaged beam with cracks in the tension side;
FIG. 2 is a schematic cross-sectional view of an FRP/ECC permeable reinforced damaged beam with cracks in the tension side;
FIG. 3 is a schematic diagram of the mechanism of action of the concrete enhancer at the interface.
In the figure: 1. a reinforced beam; 2. a concrete reinforcing agent; 3. unidirectional FRP grids; 4. ECC; 5. cracking; 6. insoluble gum formed by the reaction.
Concrete construction mode
The invention is explained in further detail below with reference to the figures and the specific embodiments.
As shown in FIG. 2, the method for reinforcing the reinforced concrete beam by the unidirectional FRP grid/ECC penetration type is disclosed. The concrete for pouring the beam is C40 concrete (cement: sand: gravel: water: 1:1.42:2.65: 0.45); the beam cross-sectional dimension is 250mm × 300mm, and the span-height ratio is 8. During reinforcement, a layer of concrete reinforcing agent 2 is sprayed on the tensile side, the FRP grid 3 is fixed on the side, and finally the composite material 4 is sprayed to form a reinforced whole.
The composite material 4 is an ultrahigh-toughness cement-based composite material; the FRP grid 3 is a unidirectional FRP grid, the longitudinal direction of the unidirectional FRP grid is CFRP, and the transverse direction of the unidirectional FRP grid is GFRP; the concrete reinforcing agent 2 is an existing concrete reinforcing agent.
The ultra-high toughness cement-based composite material is characterized in that: the weight ratio of each component to the cement is 1.5-2.0 of fly ash; 1.0-1.1 parts of 80-120-mesh quartz sand; 0.6-1.0 parts of water; water reducing agent: 0.01-0.02; PVA: 0.04-0.07; the existing concrete reinforcing agent is a concrete reinforcing agent containing high-activity fluorine titanium, a concrete reinforcing agent containing fluorine magnesium silicate, and a concrete reinforcing agent obtained by diluting ethyl silicate and ethanol according to the volume ratio of 1:1.
Beam 1(L1) is an unreinforced beam and beam 2(L2) is a reinforced beam.
| Beam | Yield load/KN | Ultimate load/KN |
| Beam 1 | 85 | 103 |
| Beam 2 | 108 | 131 |
The FRP grid/ECC is adopted to reinforce the beam, and the bearing capacity is improved by 10-15%. The bearing capacity of the reinforced concrete beam is improved by 20-30% by adopting the unidirectional FRP grid/ECC permeable reinforcing method.
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 the FRP grid and the size of the grid are required according to actual needs; the preparation of the ultra-high toughness cement-based composite material is carried out strictly according to the proportion and the feeding sequence, 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 beam for deformation. Secondly, in the construction link, the use of the anchor bolts and the lap joint of the mesh materials need to be paid attention to in the installation process of the FRP mesh. The grid material is fixed on the concrete surface by the anchor bolts, so that gaps are avoided, and the rubber pad is adopted to protect the fiber grid from being damaged when the anchor bolts are screwed down; 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. When the concrete reinforcing agent and the ultrahigh-toughness cement-based composite material are sprayed and smeared, attention is paid to the spraying and smearing sequence, the concrete reinforcing agent is firstly sprayed and smeared, and then the ultrahigh-toughness cement-based composite material is sprayed and smeared. In the case of the injection work, voids are generated in some crossing portions where the crossing portions are difficult to be filled, and voids in the mesh portions are filled and compacted with trowels.
Claims (6)
1. The utility model provides a damaged reinforced concrete roof beam is consolidated to one-way FRP net/ECC infiltration formula which characterized in that: comprises a reinforced beam (1), a concrete reinforcing agent (2), a composite material (4) and a unidirectional FRP grid (3); the preparation method comprises the following steps:
the method comprises the steps that cracks (5) exist on the tensile side of a reinforced beam (1), a layer of concrete reinforcing agent (2) is sprayed on the tensile side of the reinforced beam (1) before reinforcement, unidirectional FRP grids (3) are fixed on the tensile side, and finally composite materials (4) are sprayed on the tensile side to form a reinforced whole, so that the FRP/ECC permeable reinforced concrete beam is obtained;
the unidirectional FRP grid (3) is wrapped and restrained by the composite material (4); the concrete reinforcing agent (2) is sprayed between the FRP grid/ECC and the reinforced beam (1) so as to improve the bonding strength between the FRP grid/ECC and the reinforced beam (1); the concrete reinforcing agent (2) penetrates into cracks (5) between the FRP grid/ECC and the reinforced beam (1) to generate insoluble gel, and the gel plays the same role as an anchor bolt to pin the reinforcing layer on the reinforced beam (1).
2. A method of making a unidirectional FRP grid/ECC penetration reinforced damaged reinforced concrete beam as claimed in claim 1, wherein: the method improves the bonding strength between the FRP grid/ECC and the existing concrete beam by spraying a concrete reinforcing agent between the FRP grid/ECC and the existing concrete beam; the concrete reinforcing agent permeates into cracks to generate insoluble gel, and plays the same role as an anchor bolt to pin the reinforcing layer on the reinforced beam; the method comprises the following steps:
1) before reinforcement, a layer of concrete reinforcing agent (2) is sprayed on the tensioned side of the reinforced beam (1);
2) fixing the FRP grid (3) to the tension side;
3) and finally, spraying the composite material (4) on the tension side to form a reinforced whole.
3. The method for preparing the unidirectional FRP grid/ECC permeable reinforced concrete beam 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 1.5-2.0 of fly ash; 1.0-1.1 parts of 80-120-mesh quartz sand; 0.6-1.0 parts of water; water reducing agent: 0.01-0.02; PVA: 0.04-0.07.
4. A method of penetratively reinforcing a damaged reinforced concrete beam according to claim 2 or 3, wherein: the longitudinal direction of the unidirectional FRP grid (3) is CFRP, and the transverse direction of the unidirectional FRP grid is GFRP.
5. The method for preparing the unidirectional FRP grid/ECC permeable reinforced concrete beam as claimed in claim 2 or 3, wherein: the concrete reinforcing agent (2) is any one of a concrete reinforcing agent containing high-activity fluorine titanium, a concrete reinforcing agent containing fluorine magnesium silicate and a concrete reinforcing agent obtained by diluting ethyl silicate and ethanol according to the volume ratio of 1:1.
6. The method for preparing the unidirectional FRP grid/ECC permeable reinforced concrete beam as claimed in claim 4, wherein the method comprises the following steps: the concrete reinforcing agent (2) is one of a concrete reinforcing agent containing high-activity fluorine titanium, a concrete reinforcing agent containing magnesium fluosilicate and a concrete reinforcing agent obtained by diluting ethyl silicate and ethanol according to the volume ratio of 1:1.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011414192.2A CN112627572A (en) | 2020-12-03 | 2020-12-03 | One-way FRP grid/ECC permeation type reinforced concrete beam for reinforcing damage and preparation method thereof |
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| CN202011414192.2A CN112627572A (en) | 2020-12-03 | 2020-12-03 | One-way FRP grid/ECC permeation type reinforced concrete beam for reinforcing damage and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114718339A (en) * | 2022-04-26 | 2022-07-08 | 中交上海港湾工程设计研究院有限公司 | Structure for reinforcing beam, plate and column by adopting basalt fiber grid system and construction method |
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- 2020-12-03 CN CN202011414192.2A patent/CN112627572A/en active Pending
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| 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 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114718339A (en) * | 2022-04-26 | 2022-07-08 | 中交上海港湾工程设计研究院有限公司 | Structure for reinforcing beam, plate and column by adopting basalt fiber grid system and construction method |
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Application publication date: 20210409 |