CN110514496B - Anchoring test method for reinforcing end part of concrete beam by carbon fiber grids - Google Patents
Anchoring test method for reinforcing end part of concrete beam by carbon fiber grids Download PDFInfo
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- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
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Abstract
The application discloses an anchoring test method for reinforcing a concrete beam end part by a carbon fiber grid, which comprises the following steps: preparing a test material and a tool; preparing a test sample; sample pretreatment; sample reinforcement treatment; and (5) testing and detecting. The anchoring test method can effectively inhibit the end part of the reinforcing material from peeling off and can furthest exert the anti-bending performance of the concrete.
Description
Technical Field
The disclosure generally relates to the technical field of building reinforcement, in particular to an anchoring test method for reinforcing the end part of a concrete beam by a carbon fiber grid.
Background
The study of the durability of concrete structures is an important issue. In marine environments, western salinized areas, and areas where anti-icing salts are spilled, the corrosion of infrastructure is relatively severe. In an aggressive environment, the steel bar is damaged by environments such as salt corrosion and the like due to cracking of the reinforced concrete structure interface, thereby causing a durability problem caused by corrosion of the steel bar.
In order to solve these problems, relevant scholars research on the optimal design of the structure, and meanwhile, the material selection of the structure becomes a research hotspot.
The FRP reinforcing rib is a high-performance fiber composite material, the FRP reinforcing rib reinforces the concrete composite beam to improve the aspects of crack control, durability and the like, but with the change of the use function of the composite beam and the increase of the bearing capacity requirement in the future, the improvement of the ultimate bearing capacity of the beam needs to be optimized.
The concrete beam reinforced by the FRP reinforcing ribs is easy to have oblique section damage at the beam end position. Besides, in the test process of the sample, when the crack is expanded to the reinforcing layer of the carbon fiber fabric, the crack is expanded along the laying direction of the carbon fiber fabric while being continuously expanded along the vertical direction, and the failure form of the sample is mostly end stripping, so that the anti-bending performance of the concrete beam is greatly influenced.
Disclosure of Invention
In view of the above-mentioned drawbacks and deficiencies of the prior art, it is desirable to provide an anchor test method for reinforcing an end portion of a concrete beam with a carbon fiber mesh, which can effectively suppress the peeling of the end portion of a reinforcing material and maximize the flexural strength of concrete.
The application provides an anchoring test method for reinforcing the end part of a concrete beam by a carbon fiber grid, which comprises the following steps:
preparing a test material and a tool, cutting one piece of carbon fiber grid and two pieces of carbon fiber cloth with the required specifications for standby, preparing polymer mortar according to a proportion, uniformly stirring for standby, and cleaning a die required by sample preparation for standby;
preparing a test sample, fixing a cleaned mould on vibration equipment, flatly paving a layer of stirred polymer mortar for later use in the mould to form a first layer of mortar, starting the vibration equipment to uniformly distribute the first layer of mortar at the bottom in the mould, then closing the vibration equipment, flatly paving the cut carbon fiber grids on the surface of the first layer of mortar, continuously adding the polymer mortar into the mould to form a second layer of mortar, continuously vibrating to ensure the surface leveling of the second layer of mortar, and completing the preparation of the sample;
sample pretreatment, namely demolding the sample in the step of preparing the test sample, maintaining the demolded sample for a period of time, then respectively chamfering edges at two ends of the sample along the length direction of the sample, and cleaning up the floating dust on the surface of the sample;
reinforcing the sample, namely uniformly coating a layer of impregnating adhesive on two ends of the sample in the sample pretreatment step to serve as a base coat, uniformly coating a layer of impregnating adhesive on the surfaces of the two pieces of cut carbon fiber cloth, then respectively adhering the carbon fiber cloth to the surfaces of the two base coats, keeping the carbon fiber cloth in a stressed state in the adhering process, and continuously extruding the adhesive along the direction of carbon fiber wires of the carbon fiber cloth after the adhering is finished until the carbon fiber cloth is tightly wrapped on the end part of the sample and no residual adhesive exists;
and testing, namely maintaining the sample reinforced in the sample reinforcing treatment step for a period of time under a laboratory condition, testing the breaking strength of the sample by using a universal testing machine, and recording a detection result.
Preferably, the polymer mortar in the test material and tool preparation step is prepared according to the following ratio of water: the mortar is prepared according to the proportion of 15.5 percent; after the mould is cleaned, a layer of vaseline is uniformly smeared in the mould.
Preferably, the sample after being demoulded in the sample pretreatment step is maintained in water for 7 days, and maintained in a maintenance room for 14 days; the lengths of the chamfers at both ends of the sample were 30 cm.
Preferably, the impregnating compound in the sample reinforcing treatment step is a special impregnating compound for carbon fiber cloth.
Preferably, the test testing step involves maintaining the sample under laboratory conditions for 7 days.
Compared with the prior art, the invention has the beneficial effects that:
(1) the reinforcing structure of the anchoring test method is reasonable in design, the end anchoring can effectively prevent the stripping damage of the anchoring end, the development of cracks of a bending shear section is limited, the occurrence of cracks of an oblique section is reduced, and the bending resistance of the concrete column is enhanced;
(2) the sample after the end part is anchored shows stable cracking of a fine crack under the action of load, so that the toughness and the fracture resistance of the cement base material are fully improved by effectively verifying the reinforced structure, and the problems of quick crack development and large deformation are solved.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
fig. 1 is a flow chart of an anchoring test method for an end portion of a carbon fiber mesh reinforced concrete beam according to an embodiment of the present disclosure;
FIG. 2 is a schematic structural view of a sample;
FIG. 3 is a schematic view of the structure of the two ends of the test after chamfering.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
It should be noted that, in the present application, the embodiments and features of the embodiments may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
Referring to fig. 1, an embodiment of the present application provides an anchoring test method for an end of a carbon fiber mesh reinforced concrete beam, including the following steps:
preparing S11 test materials and tools, cutting one carbon fiber grid and two carbon fiber cloths with the required specifications for a test for standby, and mixing the polymer mortar according to the weight ratio of water: preparing the mortar in a proportion of 15.5 percent, uniformly stirring the mortar by using an electric hammer for later use, cleaning a mould required by sample preparation for later use, and uniformly coating a layer of vaseline in the mould for easy demoulding;
s12, preparing a test sample, fixing a cleaned mould on a vibration device, flatly paving a layer of stirred polymer mortar for standby in the mould to form a first layer of mortar, starting the vibration device to uniformly distribute the first layer of mortar at the bottom in the mould, then closing the vibration device, flatly paving the cut carbon fiber grids on the surface of the first layer of mortar, continuously adding the polymer mortar into the mould to form a second layer of mortar, continuously vibrating to ensure the surface leveling of the second layer of mortar, and completing the preparation of the sample;
s13, pretreating a sample, demolding the sample in the step of preparing the test sample, curing the demolded sample in water for 7 days, curing in a curing room for 14 days, chamfering edges at two ends of the sample, which are 30cm in the length direction of the edge, respectively, and cleaning floating dust on the surface of the sample by using a brush;
s14, reinforcing the sample, namely uniformly coating a layer of special impregnating adhesive for carbon fiber cloth on two ends of the sample in the sample pretreatment step to serve as base coats, uniformly coating a layer of special impregnating adhesive for carbon fiber cloth on the surfaces of the two pieces of cut carbon fiber cloth, then respectively adhering the two pieces of cloth to the surfaces of the two base coats, pulling the carbon fiber cloth in the adhering process, keeping the carbon fiber cloth in a stressed state, and continuously extruding the adhesive along the direction of carbon fiber wires of the carbon fiber cloth after adhering is finished until the carbon fiber cloth is tightly wrapped on the end part of the sample and no residual adhesive exists;
and S15 test detection, the sample reinforced in the sample reinforcing treatment step is maintained for 7 days under the laboratory condition, then the bending strength of the sample is tested by using a universal testing machine, and the detection result is recorded. The test results show that the average flexural strength of the samples after the end anchoring treatment is improved by 23.57% compared with the samples without end anchoring.
The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.
Claims (4)
1. An anchoring test method for an end part of a carbon fiber grid reinforced concrete beam is characterized by comprising the following steps:
preparing a test material and a tool, cutting one piece of carbon fiber grid and two pieces of carbon fiber cloth with the required specifications for standby, preparing polymer mortar according to a proportion, uniformly stirring for standby, and cleaning a die required by sample preparation for standby;
preparing a test sample, fixing the cleaned mould on a vibrating device, flatly paving a layer of stirred polymer mortar for later use in the mould to form a first layer of mortar, starting the vibrating device to uniformly distribute the first layer of mortar at the bottom in the mould, then closing the vibrating device, flatly paving the cut carbon fiber grids on the surface of the first layer of mortar, continuously adding the polymer mortar into the mould to form a second layer of mortar, continuously vibrating to ensure the surface leveling of the second layer of mortar, and completing the preparation of the sample;
sample pretreatment, namely demolding the sample in the step of preparing the test sample, maintaining the demolded sample for a period of time, and then chamfering edges at two ends of the sample along the length direction of the sample respectively to clean floating dust on the surface of the sample;
reinforcing the sample, namely uniformly coating a layer of impregnating adhesive on two ends of the sample in the sample pretreatment step to serve as a base coat, uniformly coating a layer of impregnating adhesive on the surfaces of the two pieces of cut carbon fiber cloth, then respectively adhering the carbon fiber cloth to the surfaces of the two base coats, keeping the carbon fiber cloth in a stressed state in the adhering process, and continuously extruding the adhesive along the direction of carbon fiber wires of the carbon fiber cloth after adhering is finished until the carbon fiber cloth is tightly wrapped on the end part of the sample and no residual adhesive exists;
and testing, namely maintaining the sample reinforced in the sample reinforcing treatment step for a period of time under laboratory conditions, testing the breaking strength of the sample by using a universal testing machine, and recording a detection result.
2. The method for testing anchoring of an end portion of a carbon fiber mesh reinforced concrete beam according to claim 1, wherein the polymer mortar in the test material and tool preparation step is prepared in terms of water: mortar =15.5% ratio configuration; after the mould is cleaned, a layer of vaseline is uniformly smeared in the mould.
3. The method for testing anchoring of an end portion of a carbon fiber mesh-reinforced concrete beam according to claim 2, wherein the sample after being demolded in the sample pretreatment step is cured in water for 7 days and cured in a curing room for 14 days; the length of chamfering treatment on both ends of the sample is 30 cm.
4. The method for testing anchoring of an end portion of a carbon fiber mesh-reinforced concrete beam according to claim 3, wherein the test detecting step cures the test specimen under laboratory conditions for 7 days.
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