CN112627573A - Rigid FRP grid/high-ductility high-permeability concrete restrained reinforced concrete column and preparation method thereof - Google Patents
Rigid FRP grid/high-ductility high-permeability concrete restrained reinforced concrete column and preparation method thereof Download PDFInfo
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- C04B2111/00034—Physico-chemical characteristics of the mixtures
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Abstract
The invention discloses a rigid FRP grid/high-ductility high-permeability concrete restrained reinforced concrete column and a preparation method thereof. The method improves the bonding strength of the interface by spraying high-ductility and high-permeability concrete. FRP grid/ECC reinforcement is an effective method for reinforcing RC column, and can enable the internal concrete to be in a three-dimensional compression state, thereby greatly increasing the strength and ductility of the core concrete. 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 high-ductility and high-permeability concrete prepared by adding the concrete reinforcing agent into the ECC in a spraying mode can effectively permeate into cracks of the concrete, reacts with free calcium ions in old concrete to generate insoluble gel, and is nailed on a reinforced structure like an anchor bolt, so that the interface bonding strength is effectively increased.
Description
Technical Field
The invention relates to the field of concrete structure reinforcement, in particular to a rigid FRP grid/high-ductility high-permeability concrete 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/high-ductility high-permeability concrete restrained reinforced damaged 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/high-ductility high-permeability concrete restrained reinforced concrete column, which is characterized in that: comprising reinforced columns, composite materials added with concrete reinforcing agents and hard FRP grids); the preparation method comprises the following steps:
the outer surface of the reinforced column is cracked, a layer of composite material added with a concrete reinforcing agent is sprayed on the outer surface of the reinforced column before reinforcement, a template is well supported, an FRP grid is placed between the template and the reinforced column, and finally the FRP grid is wrapped by pumping the composite material to form a reinforced whole, so that the rigid FRP grid/high-ductility high-permeability concrete restrained reinforced concrete column is obtained;
the FRP grids are wrapped and restrained by the composite material; the high-ductility and high-permeability concrete is sprayed, so that the bonding strength at the interface is improved, the reinforcing layer is prevented from slipping, and the three-dimensional compression of the internal concrete is ensured; the concrete reinforcing agent penetrates into cracks to generate insoluble gel, and the insoluble gel plays the same role as an anchor bolt to pin the reinforcing layer on the reinforced column.
In a second aspect, the invention provides a preparation method of the above rigid FRP grid/high-ductility high-permeability concrete restrained reinforced damaged reinforced concrete column, which is characterized in that: the method improves the bonding strength between the FRP grids and the reinforced columns by spraying high-ductility and high-permeability concrete between the reinforced columns and the FRP grids; 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 column; the method comprises the following steps:
1) before reinforcement, spraying a layer of composite material added with a concrete reinforcing agent on the outer surface of the reinforced column, and supporting a template;
2) then placing the 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 high-ductility high-permeability concrete, 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; concrete reinforcing agent: 0.02-0.05.
Further, the FRP grid is a hard CFRP grid.
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 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. And the high-ductility and high-permeability concrete can penetrate into cracks to generate insoluble gel, and the reinforcing layer is nailed on the reinforced column like an anchor bolt. Therefore, the method improves the bonding strength at the interface by spraying the high-ductility high-permeability concrete, prevents the reinforcing layer from slipping and ensures that the internal concrete is compressed in three directions.
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)2And the polymer reacts with the dopant to generate insoluble gel so as to improve the bonding strength of the FRP grid/ECC and the interface of the existing concrete column. 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. Thus spraying on ECThe high-ductility and high-permeability concrete prepared by adding the concrete reinforcing agent into the C can 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, 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 FRP can provide constraint force to enable the internal concrete to be in a three-dimensional compression state, thereby greatly increasing the strength and ductility of the core concrete
The invention has the advantages and beneficial effects that:
the FRP grid/ECC reinforced damaged reinforced concrete column is characterized in that FRP sheets in the traditional externally-adhered FRP reinforced concrete structure technology are replaced by 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. 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. The invention improves the bonding strength between the FRP grid/ECC and the existing concrete column by spraying high-ductility and high-permeability concrete prepared by adding a concrete reinforcing agent into the ECC. The high-ductility and high-permeability concrete can permeate into cracks to react with calcium ions in old concrete to generate insoluble gel, and the reinforcing layer is nailed on the reinforced column 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 cross-sectional view of a rigid FRP grid/high-ductility high-permeability concrete column for restrained reinforcement of a damaged reinforced concrete column;
FIG. 2 is a schematic view of a FRP/ECC reinforced column showing cracks;
FIG. 3 is a schematic diagram of the action mechanism of high-ductility and high-permeability concrete at the interface.
In the figure: 1. reinforced column, 2, high-ductility high-permeability concrete, 3, hard FRP grid, 4, crack, 5, insoluble gel generated by reaction, 6 and 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/high-ductility high-permeability concrete restrained reinforced damaged reinforced concrete column. The concrete used to cast the post was C30 concrete. The column was 200mm in diameter and 500mm high. Firstly, spraying a layer of composite material 2 added with concrete reinforcing agent along the outer surface of the reinforced column 1, then fixing the FRP grid 3 on the reinforced column 1, and then spraying the composite material 2 added with concrete reinforcing agent on the other side of the FRP grid 3 to form a reinforced whole.
The composite material 2 is high-ductility high-permeability concrete; the FRP grid 3 is a hard CFRP grid; the concrete reinforcing agent is an existing concrete reinforcing agent.
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 | 583 | 837 |
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/high-ductility high-permeability concrete can be improved by 20-30%.
The weight ratio of each component to cement is 1.6-2.0; 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; concrete reinforcing agent: 0.02-0.05; the existing concrete reinforcing agent is 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.
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 column for deformation. Secondly, in the middle of the link of construction, the FRP net overlap joint will satisfy the specified overlap joint length, and the both ends of overlap joint section are fixed firmly with the anchor nail, avoid the overlap joint part to become weak position. When spraying and smearing high-ductility high-permeability concrete and pumping the high-ductility high-permeability concrete, attention needs to be paid to the sequence, a layer of high-ductility high-permeability concrete is firstly sprayed and smeared outside the reinforced column, a template is supported, the FRP grid is arranged between the template and the reinforced column, and then the high-ductility high-permeability concrete is pumped.
Claims (6)
1. The utility model provides a impaired reinforced concrete column is consolidated in restraint of stereoplasm FRP net/high ductility high permeability concrete which characterized in that: comprises a reinforced column (1), a composite material (2) added with a concrete reinforcing agent and a hard FRP grid (3); the preparation method comprises the following steps:
the method comprises the steps that cracks (4) exist on the outer surface of a reinforced column (1), a layer of composite material (2) added with a concrete reinforcing agent is sprayed on the outer surface of the reinforced column (1) before reinforcement, a template (6) is supported, an FRP grid (3) is placed between the template (6) and the reinforced column (1), and finally the composite material (2) is pumped to wrap the FRP grid (3) to form a reinforced whole, so that the rigid FRP grid/high-ductility high-permeability concrete restrained reinforced damaged reinforced concrete column is obtained;
the FRP grids (3) are wrapped and restrained by the composite material (2); the high-ductility and high-permeability concrete is sprayed, so that the bonding strength at the interface is improved, the reinforcing layer is prevented from slipping, and the three-dimensional compression of the internal concrete is ensured; the concrete reinforcing agent penetrates into the cracks (4) to generate insoluble gel, and the insoluble gel plays the same role as an anchor bolt to pin the reinforcing layer on the reinforced column (1).
2. A method of making a rigid FRP grid/high ductility high permeability concrete column of claim 1 for restraining and reinforcing damaged reinforced concrete columns, characterized in that: the method improves the bonding strength between the FRP grids and the reinforced columns by spraying high-ductility and high-permeability concrete between the reinforced columns and the FRP grids; 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 column; the method comprises the following steps:
1) before reinforcement, spraying a layer of composite material (2) added with a concrete reinforcing agent on the outer surface of a reinforced column (1), and supporting a template (6);
2) then the FRP grid (3) is arranged between the template (6) and the reinforced column (1);
3) and finally, pumping the composite material (2) to wrap the FRP grid (3) to form a reinforced whole.
3. The method for preparing the rigid FRP grid/high-ductility high-permeability concrete restrained reinforced damaged reinforced concrete column according to claim 2, which is characterized by comprising the following steps: the composite material (2) is high-ductility high-permeability concrete, 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; concrete reinforcing agent: 0.02-0.05.
4. The method for preparing the rigid FRP grid/high-ductility high-permeability concrete restrained reinforced damaged reinforced concrete column according to claim 2 or 3, which is characterized by comprising the following steps: the FRP grid (3) is a hard CFRP grid.
5. The method for preparing the rigid FRP grid/high-ductility high-permeability concrete restrained reinforced damaged reinforced concrete column according to claim 2 or 3, which is characterized by comprising the following steps: the concrete reinforcing agent is any 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.
6. The method for preparing the rigid FRP grid/high-ductility high-permeability concrete restrained reinforced damaged reinforced concrete column according to claim 4, which is characterized by comprising the following steps: the concrete reinforcing agent is any 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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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116290885A (en) * | 2023-03-17 | 2023-06-23 | 山东建筑大学 | Method for reinforcing reinforced concrete column after fire disaster by high-ductility cement-based composite material |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116290885A (en) * | 2023-03-17 | 2023-06-23 | 山东建筑大学 | Method for reinforcing reinforced concrete column after fire disaster by high-ductility cement-based composite material |
| CN116290885B (en) * | 2023-03-17 | 2023-11-03 | 山东建筑大学 | Method for reinforcing reinforced concrete column after fire disaster by high-ductility cement-based composite material |
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Application publication date: 20210409 |