CN110320078B - Preparation method of carbon fiber grid bond stress sample - Google Patents
Preparation method of carbon fiber grid bond stress sample Download PDFInfo
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- CN110320078B CN110320078B CN201910617171.1A CN201910617171A CN110320078B CN 110320078 B CN110320078 B CN 110320078B CN 201910617171 A CN201910617171 A CN 201910617171A CN 110320078 B CN110320078 B CN 110320078B
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Abstract
The application discloses preparation method of carbon fiber grid bond stress sample, which is characterized by comprising the following steps: pretreating concrete bricks; pretreating carbon fiber grids; preparing mortar; preparing a gripping force sample; and (5) maintaining. The bond stress sample prepared by the method has high degree of fitting with the actual construction condition, reasonable structural design and accurate test data.
Description
Technical Field
The disclosure generally relates to the technical field of building reinforcement, and particularly relates to a preparation method of a carbon fiber grid bond stress sample.
Background
In recent years, a large number of houses, roads, bridges and the like in China reach the safe service life, but the degree that the buildings need to be overturned for reconstruction is not reached, and the method for reinforcing and repairing the buildings is the most economic and effective method after the buildings are locally damaged. Composite materials have been widely used for building repair and structural reconstruction, and fabric reinforced cement based composite (FRCM) is a material specifically used for building and concrete repair.
The carbon fiber grid has the advantages of light weight and chemical corrosion resistance, and the composite material obtained by compounding the carbon fiber grid with the polymer mortar has excellent mechanical property and can be used as a high-strength anti-corrosion structural material to be applied to the aspect of building reinforcement. The carbon fiber grids and the polymer mortar act synergistically to form a sandwich structure of polymer mortar/carbon fiber grids/polymer mortar, a carbon fiber grid/polymer mortar interface exists in a composite system, and in an FRCM system, the bonding capacity between the polymer mortar and the carbon fiber grids is called as polymer mortar-carbon fiber grid bond stress.
The bond stress sample of the carbon fiber fabric reinforced cement-based composite material is that carbon fibers are paved between two layers of mortar, and the whole system is a sandwich-shaped plate hexahedron sample. And measuring the bond stress of the sample by a unidirectional tensile test.
The existing test sample is contacted with mortar at a clamping part, so that the end part of the test sample is easily damaged by the pressure between clamps, the bonding force error between the measured data and the actual test sample is larger, the data tested by the test sample is inaccurate, and the test sample is not authoritative; secondly, the difference between the existing bond stress sample and the actual construction condition is large, the reinforcing matrix cannot be reflected in the sample, and the degree of fit with the actual construction condition is not high.
Disclosure of Invention
In view of the above defects or shortcomings in the prior art, it is desirable to provide a method for preparing a carbon fiber mesh bond stress sample with high conformity with actual construction conditions and accurate test data.
The application provides a preparation method of a carbon fiber grid bond stress sample, which comprises the following steps:
pretreating concrete bricks, selecting the concrete bricks with the specifications required by a test, taking two faces with the largest area of the concrete bricks as test base faces, grinding the concrete bricks roughly by using an angle grinder, grinding two end faces of the concrete bricks along the length direction to enable the size of the concrete bricks to be matched with detection equipment, cleaning dust particles on the surfaces of the concrete bricks by using a brush after grinding is finished, then respectively coating a layer of interface adhesive on the two test base faces, and coating a layer of interface adhesive after the interface adhesive is absorbed by the test base faces;
the method comprises the following steps of (1) pretreating a carbon fiber grid, cutting a long-strip-shaped carbon fiber grid with a specification required by a test to be used as a sample, fixing the carbon fiber grid sample on a table top of a grid fixing table, coating a layer of epoxy reagent on the surface of the carbon fiber grid sample, extruding the redundant epoxy reagent after the coating is finished, putting the carbon fiber grid sample into a drying oven, drying and curing the epoxy reagent on the surface of the carbon fiber grid sample, and keeping the carbon fiber grid sample for later use after the coating is finished;
preparing mortar, namely mixing the raw material of the wet-process sprayed polymer mortar with water according to a ratio, and fully and uniformly stirring for later use;
preparing a bond strength sample, coating a layer of wet spraying polymer mortar on one test base surface along the length direction of the test base surface to form a first layer of mortar, aligning one end of a standby carbon fiber grid sample along the length direction of the standby carbon fiber grid sample with one end of the first layer of mortar along the length direction of the first layer of mortar, then flatly paving the first layer of mortar on the surface of the first layer of mortar, coating a layer of wet spraying polymer mortar on the carbon fiber grid sample on the surface of the first layer of mortar to form a second layer of mortar, then bending the other end of the carbon fiber grid sample along the length direction of the standby carbon fiber grid sample to the other test base surface, repeating the preparation operation of the bond strength sample, and completing the whole preparation process of the bond strength sample;
and (5) curing, namely curing the bond strength sample for a period of time under the condition of a curing room after the bond strength sample is prepared.
Preferably, the specification of the concrete block selected in the concrete block pretreatment step is 20cm × 10cm × 6 cm.
Preferably, the specification of the carbon fiber mesh sample in the carbon fiber mesh pretreatment step is 98cm × 6 cm.
Preferably, the coating size of the first layer of mortar in the bond stress sample preparation step is 15cm multiplied by 6cm multiplied by 0.5 cm; the coating size of the second layer mortar is 15cm × 6cm × 1 cm.
Preferably, the maintaining time of the grip strength test piece in the maintaining step is 28 days.
Compared with the prior art, the beneficial effects of this application are:
according to the preparation method of the carbon fiber grid bond stress sample, the carbon fiber grids are anchored by mortar on two sides of the concrete brick, the degree of contact with the actual situation of a construction site is high, and the actual construction situation can be well reflected;
simultaneously, preparation sample structural design is reasonable, through the exterior structure change with the sample, utilizes the mortar to anchor the carbon fiber net in concrete brick both sides, and the sample atress position when the test changes middle concrete brick atress into by original mortar reinforcement piece like this, and the position of contact does not contact test fixture between mortar and the carbon fiber net has improved the fragile phenomenon of former mortar reinforcement piece, the effectual degree of accuracy that improves the bond stress test between carbon fiber net and the polymer mortar.
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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 schematic flow chart of a method for preparing a carbon fiber mesh bond stress sample according to an embodiment of the present application.
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, a schematic flow chart of a method for preparing a carbon fiber mesh bond strength test sample provided in an embodiment of the present application includes the following steps:
s11 concrete brick pretreatment, selecting concrete bricks with the specification of 20cm multiplied by 10cm multiplied by 6cm required by a test, taking two faces with the largest area of the concrete bricks as test base faces, grinding roughly by using an angle grinder to improve the adhesive force of the test base faces, grinding two end faces of the concrete bricks along the length direction to enable the size of the concrete bricks to be matched with detection equipment, cleaning dust particles on the surfaces of the concrete bricks by using a brush after grinding is finished, then respectively coating a layer of interface adhesive on the two test base faces, and coating a layer of interface adhesive after the interface adhesive is absorbed by the test base faces to ensure that the test base faces are fully soaked.
Concrete bricks are selected as a test base surface, so that the preparation of the sample is high in degree of contact with the actual condition of a construction site, and the actual construction condition can be well reflected.
S12 carbon fiber mesh preprocessing, wherein a strip-shaped carbon fiber mesh with the specification of 98cm multiplied by 6cm required by a cutting test is taken as a sample, the longer the length of the carbon fiber mesh sample is, when two ends of the carbon fiber mesh sample are respectively subjected to sample preparation on two test base planes, the smaller the influence of the elastic restoring force after the carbon fiber mesh sample is bent on the sample preparation is, the cutting length of the carbon fiber mesh sample is 4.9 times of the length of the test base planes and is the minimum length which does not substantially influence the sample preparation, and the cutting length of the carbon fiber mesh sample is not less than 4.9 times of the length of the test base planes. Cutting a carbon fiber grid sample, fixing the cut carbon fiber grid sample on a table top of a grid fixing table, coating a layer of epoxy reagent on the surface of the carbon fiber grid sample, extruding the redundant epoxy reagent after coating, putting the carbon fiber grid sample into a drying oven, drying and curing the epoxy reagent on the surface of the carbon fiber grid sample, and keeping the carbon fiber grid sample for later use;
after the carbon fiber surface is coated and cured by the epoxy coating, the problem of 'layer-by-layer expansion' of the carbon fiber bundle caused by low inertia of the carbon fiber surface is obviously improved, and the bonding performance among fiber precursors is improved.
And S13, preparing mortar, namely mixing the raw material of the wet-process sprayed polymer mortar with water according to a ratio, and fully and uniformly stirring for later use.
S14 bond strength sample preparation, coating a layer of wet spraying polymer mortar of 15cm multiplied by 6cm multiplied by 0.5cm on one test base surface along the length direction to form a first layer of mortar, aligning one end of a spare carbon fiber grid sample along the length direction with one end of the first layer of mortar along the length direction, then flatly paving the first layer of mortar on the surface of the first layer of mortar, coating a layer of wet spraying polymer mortar of 15cm multiplied by 6cm multiplied by 1cm on the carbon fiber grid sample on the surface of the first layer of mortar to form a second layer of mortar, then bending the other end of the carbon fiber grid sample along the length direction to the other test base surface, repeating the bond strength sample preparation operation, and finishing the whole preparation process of the bond strength sample.
The preparation sample structural design is reasonable, through the appearance structure change with the sample, utilize the mortar to anchor the carbon fiber net in concrete brick both sides, the stress position of sample when the test changes middle concrete brick atress into by original mortar reinforcement piece like this, the position of contact between mortar and the carbon fiber net does not contact test fixture, has improved the breakable phenomenon of former sample mortar reinforcement piece, the effectual degree of accuracy that improves the bond stress test between carbon fiber net and the polymer mortar.
And S15, curing, namely curing the bond strength sample for 28 days under the condition of a curing room after the bond strength sample is prepared.
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 (5)
1. The preparation method of the carbon fiber grid bond stress sample is characterized by comprising the following steps of:
pretreating concrete bricks, selecting the concrete bricks with the specifications required by a test, taking two surfaces with the largest area of the concrete bricks as test base surfaces, grinding the surfaces roughly by using an angle grinder, then grinding two end surfaces of the concrete bricks along the length direction to enable the size of the concrete bricks to be matched with detection equipment, cleaning dust particles on the surfaces of the concrete bricks by using a brush after grinding is finished, then respectively coating a layer of interface adhesive on the two test base surfaces, and coating a layer of interface adhesive after the interface adhesive is absorbed by the test base surfaces;
the method comprises the following steps of (1) pretreating a carbon fiber grid, cutting a long-strip-shaped carbon fiber grid with a specification required by a test to be used as a sample, fixing the carbon fiber grid sample on a table top of a grid fixing table, coating a layer of epoxy reagent on the surface of the carbon fiber grid sample, extruding the redundant epoxy reagent after the coating is finished, putting the carbon fiber grid sample into a drying oven, drying and curing the epoxy reagent on the surface of the carbon fiber grid sample, and keeping the carbon fiber grid sample for later use after the coating is finished;
preparing mortar, namely mixing the raw material of the wet-process sprayed polymer mortar with water according to a ratio, and fully and uniformly stirring for later use;
preparing a bond strength sample, namely coating a layer of wet spraying polymer mortar on one test base surface along the length direction of the test base surface to form a first layer of mortar, aligning one end of the spare carbon fiber grid sample along the length direction of the spare carbon fiber grid sample with one end of the first layer of mortar along the length direction of the spare carbon fiber grid sample, then flatly paving the spare carbon fiber grid sample on the surface of the first layer of mortar, coating a layer of wet spraying polymer mortar on the carbon fiber grid sample on the surface of the first layer of mortar to form a second layer of mortar, then bending the other end of the spare carbon fiber grid sample along the length direction of the spare carbon fiber grid sample to the other test base surface, and repeating the preparation operation of the bond strength sample to finish the whole preparation process of the bond strength sample;
and (5) curing, namely curing the bond strength sample for a period of time under the condition of a curing room after the bond strength sample is prepared.
2. The method for preparing the carbon fiber grid grip strength test sample according to claim 1, wherein the specification of the concrete brick selected in the concrete brick pretreatment step is 20cm x 10cm x 6 cm.
3. The method for preparing the carbon fiber grid grip strength test piece according to claim 2, wherein the specification of the carbon fiber grid test piece in the carbon fiber grid pretreatment step is 98cm x 6 cm.
4. The method for preparing the carbon fiber grid bond stress sample according to claim 3, wherein the coating size of the first layer of mortar in the bond stress sample preparation step is 15cm x 6cm x 0.5 cm; the coating size of the second layer of mortar is 15cm multiplied by 6cm multiplied by 1 cm.
5. The method for preparing the carbon fiber grid bond stress sample according to claim 4, wherein the curing time of the bond stress sample in the curing step is 28 days.
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