CN112482813A - FRP/ECC permeable bidirectional reinforced concrete bidirectional slab capable of reinforcing damaged steel bar in two directions and preparation method thereof - Google Patents
FRP/ECC permeable bidirectional reinforced concrete bidirectional slab capable of reinforcing damaged steel bar in two directions and preparation method thereof Download PDFInfo
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- CN112482813A CN112482813A CN202011410048.1A CN202011410048A CN112482813A CN 112482813 A CN112482813 A CN 112482813A CN 202011410048 A CN202011410048 A CN 202011410048A CN 112482813 A CN112482813 A CN 112482813A
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- E—FIXED CONSTRUCTIONS
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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
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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
- E04G23/0203—Arrangements for filling cracks or cavities in building constructions
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention discloses an FRP/ECC permeable bidirectional reinforced concrete bidirectional slab and a preparation method thereof. According to the method, the concrete reinforcing agent of the high-activity fluorine titanium matter is sprayed between the FRP grid/ECC and the RC bidirectional plate, so that the transverse and longitudinal bonding strength between the FRP grid/ECC and the RC bidirectional plate is improved. For the RC plate 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 peeling stress is greater than the bonding strength between the reinforcing layer and the RC plate, the reinforcing layer can peel off to cause reinforcing failure. When the bidirectional plate is reinforced, the FRP grids are stressed in both directions, so that the requirement on bonding strength is higher. The reinforcing agent sprayed with the high-activity titanium fluoride can effectively permeate into cracks of the concrete, reacts with free calcium ions in the old concrete to generate insoluble gel, and nails the reinforcing layer on the reinforced structure like an anchor bolt.
Description
Technical Field
The invention relates to the field of concrete structure reinforcement, in particular to an FRP/ECC permeable bidirectional reinforced damaged reinforced concrete bidirectional plate and a preparation 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 an FRP/ECC permeable bidirectional reinforced concrete bidirectional slab and a preparation method thereof, namely a method for FRP grid/ultrahigh-toughness cement-based composite material (ECC) permeable bidirectional reinforced concrete bidirectional slab.
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
in a first aspect, the invention provides an FRP/ECC permeable bidirectional reinforced concrete bidirectional slab, which is characterized in that: comprises a reinforced plate, a concrete reinforcing agent, a composite material and FRP grids; the preparation method comprises the following steps:
the reinforced plate is characterized in that cracks exist at the plate bottom of the reinforced plate, a layer of concrete reinforcing agent is sprayed on the plate bottom of the reinforced plate before reinforcement, the FRP grid is fixed to the plate bottom, and finally a composite material is sprayed on the plate bottom to form a reinforced whole, so that the FRP/ECC permeable bidirectional reinforced concrete bidirectional plate is obtained;
the FRP grids are wrapped and restrained by the composite material; the concrete reinforcing agent is sprayed between the FRP grid/ECC and the reinforced plate, so that the transverse and longitudinal bonding strength between the FRP grid/ECC and the reinforced plate is improved, and the reinforcing failure caused by the peeling and falling phenomena of the reinforcing layer due to overlarge peeling stress is prevented; the concrete reinforcing agent penetrates into cracks between the FRP grid/ECC and the reinforced plate to generate insoluble gel, and the gel plays the same role as an anchor bolt to pin the reinforcing layer on the reinforced plate.
In a second aspect, the present invention provides a method for the above FRP/ECC infiltration type bidirectional reinforcement of damaged reinforced concrete bidirectional slab, which is characterized in that:
the method improves the transverse and longitudinal bonding strength between the FRP grid/ECC and the existing concrete bidirectional plate by spraying a concrete reinforcing agent between the FRP grid/ECC and the existing concrete bidirectional plate; 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 plate; the method comprises the following steps:
1) before reinforcement, spraying a layer of concrete reinforcing agent on the bottom of a reinforced plate;
2) fixing the FRP grids to the bottom of the plate;
3) and finally, spraying a composite material on the bottom of the plate 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 1.4-2.0 of fly ash; 1.0-1.1 parts of 80-120-mesh quartz sand; 0.5-1 part of water; water reducing agent: 0.01-0.015; PVA: 0.05-0.06.
Further, the FRP mesh is a CFRP mesh.
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.
When the bidirectional plate is reinforced, the FRP grids are stressed bidirectionally; in order to ensure that the FRP can provide effective bidirectional constraint, the bonding strength at the interface needs to be improved; the concrete reinforcing agent can penetrate into cracks to generate insoluble gel, and the reinforcing layer is nailed on the reinforced plate like an anchor bolt; therefore, the method improves the transverse and longitudinal bonding strength between the FRP grid/ECC and the existing reinforced concrete slab by spraying the concrete reinforcing agent between the FRP grid/ECC and the existing reinforced concrete slab; the reinforcing failure caused by peeling and falling off phenomena of the reinforcing layer due to overlarge peeling stress is prevented.
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 an insoluble gel and thereby increase the bond strength at the interface of the FRP grid/ECC with the existing concrete slab. The concrete reinforcing agent has certain permeabilityPenetration ability, effective penetration can reach 3-8mm, and 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. Thus, an existing concrete reinforcing agent can be sprayed between the FRP mesh/ECC and the existing panel to further improve the bond 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, the fire resistance of the structure and the erosion resistance of harmful ions such as chloride ions can be improved, 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 advantages and beneficial effects that:
the FRP grid/ECC reinforcing damaged reinforced concrete slab is characterized in that FRP sheet materials in the traditional externally-attached FRP reinforced concrete structure technology are replaced with the FRP grid; 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. In addition, when the bidirectional plate is reinforced, the FRP grid is stressed in both directions, so that the requirement on bonding strength is higher. The invention improves the bonding strength between the FRP grid/ECC and the existing concrete slab in the transverse direction and the longitudinal direction by spraying the concrete reinforcing agent between the FRP grid/ECC and the existing concrete slab. The concrete reinforcing agent can penetrate into cracks to generate insoluble gel, and the reinforcing layer is nailed on the reinforced plate 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 an FRP/ECC permeable bi-directional reinforced concrete bi-directional slab;
FIG. 2 is a schematic view of a bi-directional plate bottom crack;
FIG. 3 is a schematic cross-sectional view of a FRP/ECC permeable bi-directional reinforced concrete bi-directional panel with damaged reinforcement;
fig. 4 is a schematic diagram of the action mechanism of the concrete reinforcing agent at the interface.
In the figure: 1. is a reinforced plate; 2. a concrete reinforcing agent; 3. CFRP 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. 3, the FRP/ECC permeable bidirectional reinforced concrete bidirectional slab reinforcing method of the invention. The concrete used for casting the slab is C20 concrete with the size of 1800mm multiplied by 1500mm multiplied by 70mm and four simple sides. During reinforcement, a layer of concrete reinforcing agent 2 is sprayed on the bottom of the plate, 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 CFRP grid; 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 1.4-2 of fly ash; 1.0-1.1 parts of 80-120-mesh quartz sand; 0.5-1 part of water; water reducing agent: 0.01-0.015; PVA: 0.05-0.06; the existing concrete reinforcing agent 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.
Panel 1(B1) is an unreinforced panel and panel 2(B2) is a reinforced panel.
| Board | Yield load KN | Ultimate load KN |
| |
20 | 44 |
| |
25 | 56 |
The FRP grid/ECC is adopted to reinforce the bidirectional plate, and the bearing capacity is improved by 10-15%. The FRP/ECC permeable bidirectional reinforced concrete bidirectional plate has bearing capacity increased 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 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 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 bidirectional plate 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 two-way board of impaired reinforced concrete of FRP ECC infiltration type two-way reinforcement which characterized in that: comprises a reinforced plate (1), a concrete reinforcing agent (2), a composite material (4) and an FRP grid (3); the preparation method comprises the following steps:
the reinforced concrete two-way plate is characterized in that cracks (5) exist at the plate bottom of the reinforced plate (1), a layer of concrete reinforcing agent (2) is sprayed on the plate bottom of the reinforced plate (1) before reinforcement, the FRP grid (3) is fixed to the plate bottom, and finally a composite material (4) is sprayed on the plate bottom to form a reinforced whole, so that the FRP/ECC permeable two-way reinforced damaged reinforced concrete two-way plate is obtained;
the 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 plate (1) so as to improve the transverse and longitudinal bonding strength between the FRP grid/ECC and the reinforced plate (1) and prevent the reinforcing layer from peeling off due to overlarge peeling stress to cause reinforcing failure; the concrete reinforcing agent (2) penetrates into cracks (5) between the FRP grid/ECC and the reinforced plate (1) to generate insoluble gel, and the gel plays the same role as an anchor bolt to pin the reinforcing layer on the reinforced plate (1).
2. A method for preparing the FRP/ECC permeable bi-directional reinforced concrete bi-directional panel as claimed in claim 1, wherein:
the method improves the transverse and longitudinal bonding strength between the FRP grid/ECC and the existing concrete bidirectional plate by spraying a concrete reinforcing agent between the FRP grid/ECC and the existing concrete bidirectional plate; 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 plate; the method comprises the following steps:
1) before reinforcement, a layer of concrete reinforcing agent (2) is sprayed on the bottom of a reinforced plate (1);
2) then fixing the FRP grid (3) to the bottom of the plate;
3) and finally, spraying a composite material (4) at the bottom of the plate to form a reinforced whole.
3. The method for preparing the FRP/ECC permeable bidirectional reinforced damaged reinforced concrete bidirectional plate as recited in claim 2, wherein: the composite material (4) is an ultrahigh-toughness cement-based composite material, and the weight ratio of each component to cement is 1.4-2.0 of fly ash; 1.0-1.1 parts of 80-120-mesh quartz sand; 0.5-1 part of water; water reducing agent: 0.01-0.015; PVA: 0.05-0.06.
4. The method for preparing the FRP/ECC permeable bidirectional reinforced damaged reinforced concrete bidirectional plate as claimed in claim 2 or 3, wherein: the FRP grid (3) is a CFRP grid.
5. The method for preparing the FRP/ECC permeable bidirectional reinforced damaged reinforced concrete bidirectional plate 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 FRP/ECC permeable bidirectional reinforced damaged reinforced concrete bidirectional plate as recited in claim 4, wherein: 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 |
|---|---|---|---|
| CN202011410048.1A CN112482813A (en) | 2020-12-03 | 2020-12-03 | FRP/ECC permeable bidirectional reinforced concrete bidirectional slab capable of reinforcing damaged steel bar in two directions and preparation method thereof |
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|---|---|---|---|
| CN202011410048.1A CN112482813A (en) | 2020-12-03 | 2020-12-03 | FRP/ECC permeable bidirectional reinforced concrete bidirectional slab capable of reinforcing damaged steel bar in two directions and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114775459A (en) * | 2022-04-02 | 2022-07-22 | 东莞理工学院 | Coastal concrete reinforcement and monitoring integrated device and method |
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Application publication date: 20210312 |