CN111321908A - Method for enhancing interface strength of carbon fiber grid reinforced cement-based composite material - Google Patents
Method for enhancing interface strength of carbon fiber grid reinforced cement-based composite material Download PDFInfo
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- CN111321908A CN111321908A CN202010137133.9A CN202010137133A CN111321908A CN 111321908 A CN111321908 A CN 111321908A CN 202010137133 A CN202010137133 A CN 202010137133A CN 111321908 A CN111321908 A CN 111321908A
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- carbon fiber
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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
- E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/10—Coating or impregnating
- C04B20/1051—Organo-metallic compounds; Organo-silicon compounds, e.g. bentone
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/38—Polysaccharides or derivatives thereof
- C04B24/383—Cellulose or derivatives thereof
Abstract
The invention discloses a method for enhancing the interface strength of a carbon fiber grid reinforced cement-based composite material, which comprises the following steps of: carrying out surface treatment on the carbon fiber grids; coating inner layer mortar; laying a carbon fiber grid; and coating outer layer mortar. The enhancement method can effectively enhance the anchoring effect of the CMCCs.
Description
Technical Field
The invention relates to the technical field of building reinforcement, in particular to a method for enhancing the interface strength of a carbon fiber grid reinforced cement-based composite material.
Background
In the aspect of building reinforcement, the carbon fiber grid reinforcement system is produced as a convenient and efficient reinforcement system which can be used for different buildings and meet different reinforcement requirements. It has the following advantages: the two-way stress can bear the horizontal and longitudinal loads at the same time, and the extension of horizontal and longitudinal cracks is effectively inhibited; the occupied space is small, the carbon fiber grids are effectively anchored on the surface of the reinforced building by spraying the polymer mortar by a wet method, and the original size of the building to be reinforced is hardly increased; the wet-process spraying polymer mortar contains a large amount of inorganic materials, so that the fireproof performance is excellent, the surface inertia of carbon fibers is large, and the fireproof performance is good, so that the composite of the carbon fibers and the inorganic materials still has good fireproof performance; the application range is wide, and the building block is suitable for different building structures, such as reinforced concrete structures, masonry structures and the like. Meanwhile, under various working conditions such as a rough base surface, a humid environment and the like, a carbon fiber grid reinforcing system can be adopted for repairing and reinforcing; in addition, the carbon fiber grid reinforcing system also has the advantages of good compatibility and harmony with the concrete of the original component, corrosion resistance, good durability and the like.
Carbon fiber mesh reinforced cement-based Composite Materials (CMCCs) are widely applied to the building reinforcement industry due to excellent mechanical properties of the CMCCs. However, the carbon fiber mesh has the defects of low surface chemical activity, poor stress transfer capability among fibers and the like, so that the bonding strength between the carbon fiber mesh and the polymer mortar interface is low, and the specific expression is that the anchoring effect of a reinforcing system is poor. When the CMCCs bear loads, relative sliding is easy to occur at a joint interface inside the system, so that the safety of the reinforced system is reduced, and even the reinforced system fails, and further the further popularization and application of the CMCCs in the reinforcement industry are limited.
Disclosure of Invention
In view of the above-mentioned drawbacks and deficiencies of the prior art, it would be desirable to provide a method for enhancing interfacial strength of carbon fiber mesh reinforced cement-based composite materials that effectively enhances the anchoring effect of the cccs.
The invention provides a method for enhancing the interface strength of a carbon fiber grid reinforced cement-based composite material, which comprises the following steps of:
treating the surface of a carbon fiber grid, namely adding a silane coupling agent into an epoxy resin structural adhesive, fully stirring, uniformly coating the epoxy resin structural adhesive on the surface of the carbon fiber grid, standing for a period of time, extruding the redundant epoxy resin structural adhesive on the surface of the carbon fiber grid, and curing the epoxy resin structural adhesive on the surface of the carbon fiber grid for later use;
coating inner layer mortar, coating a layer of epoxy group interface agent on the concrete base surface subjected to surface treatment, and coating a layer of wet-process spraying polymer mortar on the concrete base surface to form inner layer mortar;
laying carbon fiber grids, overlapping and laying the carbon fiber grids subjected to surface treatment on the surface of the inner layer mortar, and pressing the carbon fiber grids to embed the carbon fiber grids into the surface of the inner layer mortar;
and coating outer layer mortar, and coating a layer of wet spraying polymer mortar on the surface of the laid carbon fiber grid to form the outer layer mortar.
Preferably, hydroxymethyl cellulose is added into the wet-spraying polymer mortar in the step of coating the inner layer mortar and the step of coating the outer layer mortar.
Preferably, the mass fraction of the hydroxymethyl cellulose added in the wet-spraying polymer mortar is 0.5%.
Preferably, the silane coupling agent is added in an amount of 1% by mass in the carbon fiber mesh surface treatment step, and the epoxy resin structural adhesive is stirred in an amount of a: B ═ 3: 1.
Preferably, the carbon fiber grids which are extruded in the carbon fiber grid surface treatment step are cured at 80 ℃ for 2 hours.
Preferably, the coating thickness of the inner layer mortar in the step of coating the inner layer mortar is 4-6 mm.
Preferably, the coating thickness of the outer layer mortar in the step of coating the outer layer mortar is 9-11 mm.
Compared with the prior art, the invention has the beneficial effects that:
according to the CMCCs interface strength enhancing method, the Silane Coupling Agent (SCA) is added into the epoxy resin structural adhesive, the epoxy resin structural adhesive is coated on the surface of the carbon fiber grid for curing, the carbon fiber grid is subjected to surface treatment, and the polar group is introduced into the surface of the carbon fiber through the coating treatment method, so that the chemical activity of the surface of the carbon fiber grid is improved, and the bonding strength of the composite material interface is effectively enhanced;
hydroxymethyl cellulose (HMC) is added into the wet-process spraying polymer mortar, and when CMCCs bear external loads, hydroxyl groups rich in HMC are beneficial to uniform transmission of internal loads of the composite material, so that stress concentration is avoided, and the bearing capacity of the composite material is improved.
The bonding strength of the CMCCs interface is effectively improved by adding SCA and HMC in the interface of the modified carbon fiber grid and the wet-process sprayed polymer mortar. The anchoring efficiency of the carbon fiber grid reinforcing system is greatly improved. The security of the reinforcing system is improved, and the further popularization and application of the CMCCs in the reinforcing industry can be promoted.
It should be understood that the statements herein reciting aspects are not intended to limit the critical or essential features of any embodiment of the invention, nor are they intended to limit the scope of the invention. Other features of the present invention will become apparent from the following description.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments made with reference to the following drawings:
fig. 1 is a schematic flow chart of a method for enhancing interfacial strength of a carbon fiber mesh-reinforced cement-based composite material according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying 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 the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Example 1:
referring to fig. 1, an embodiment of the present invention provides a method for enhancing interfacial strength of a carbon fiber mesh reinforced cement-based composite material, including the following steps:
treating the surface of the carbon fiber mesh, namely adding 1% by mass of silane coupling agent into the epoxy resin structural adhesive prepared according to the ratio of A to B to 3 to 1, fully stirring, uniformly coating the epoxy resin structural adhesive on the surface of the cut carbon fiber mesh, standing for 5min, manually extruding the redundant epoxy resin structural adhesive on the surface of the carbon fiber mesh, and curing the carbon fiber mesh for 2h at a high temperature of 80 ℃ for later use;
smearing inner layer mortar, mixing the inner layer mortar with wet-process spraying polymer mortar for later use, performing chiseling or polishing treatment on a concrete base surface to be reinforced, cleaning the concrete base surface, coating a layer of epoxy group interface agent on the concrete base surface, performing infiltration on the concrete and the surface, increasing the interface bonding strength between the concrete base surface and a composite material, and smearing a layer of wet-process spraying polymer mortar with the thickness of 5mm on the concrete base surface before the epoxy group interface agent is dried to form inner layer mortar;
laying carbon fiber grids, overlapping and laying the carbon fiber grids subjected to surface treatment on the surface of the inner-layer mortar, wherein the overlapping width is 200mm, and pressing the carbon fiber grids by using a plastering trowel to embed the carbon fiber grids into the surface of the inner-layer mortar for fixation;
and (3) coating outer layer mortar, coating a layer of wet spraying polymer mortar with the thickness of 10mm on the surface of the laid carbon fiber grid to form the outer layer mortar, and performing light-collecting treatment on the surface.
Example 2:
the embodiment of the invention provides a method for enhancing the interface strength of a carbon fiber grid reinforced cement-based composite material, which comprises the following steps:
treating the surface of the carbon fiber mesh, namely adding 1% by mass of silane coupling agent into the epoxy resin structural adhesive prepared according to the ratio of A to B to 3 to 1, fully stirring, uniformly coating the epoxy resin structural adhesive on the surface of the cut carbon fiber mesh, standing for 5min, manually extruding the redundant epoxy resin structural adhesive on the surface of the carbon fiber mesh, and curing the carbon fiber mesh for 2h at a high temperature of 80 ℃ for later use;
coating inner layer mortar, adding hydroxymethyl cellulose with the mass fraction of 0.5% into the wet-process injection polymer mortar, uniformly stirring for later use, performing chiseling or polishing treatment on a concrete base surface to be reinforced, cleaning, coating a layer of epoxy group interface agent on the concrete base surface, performing infiltration action on the concrete base surface, increasing the interface bonding strength between the concrete base surface and a composite material, and coating a layer of wet-process injection polymer mortar with the thickness of 5mm on the concrete base surface before the surface of the epoxy group interface agent is dried to form the inner layer mortar;
laying carbon fiber grids, overlapping and laying the carbon fiber grids subjected to surface treatment on the surface of the inner-layer mortar, wherein the overlapping width is 200mm, and pressing the carbon fiber grids by using a plastering trowel to embed the carbon fiber grids into the surface of the inner-layer mortar for fixation;
and (3) coating outer layer mortar, coating a layer of wet spraying polymer mortar with the thickness of 10mm and added with hydroxymethyl cellulose on the surface of the laid carbon fiber grid to form the outer layer mortar, and performing light-collecting treatment on the surface of the outer layer mortar.
And (3) experimental verification:
in order to verify that the method can effectively increase the bonding strength between the interfaces of the composite material, the inventor carries out a verification test:
1. material preparation
Cutting a plurality of carbon fiber grid samples, fixing two ends of the cut samples on an iron fixing table, preparing epoxy resin structural adhesive according to the ratio of A to B being 3:1, fully stirring by using a glass rod, coating the uniformly prepared epoxy resin structural adhesive on the surface of the sample, standing for 5min, manually extruding the redundant epoxy resin structural adhesive, curing for 2h at 80 ℃, adding a Silane Coupling Agent (SCA) (1%) into the epoxy resin structural adhesive, processing the carbon fiber grids according to the same steps to obtain carbon fiber grids jointly processed by the SCA and the epoxy resin structural adhesive, and cutting the grids into the carbon fiber grid reinforced cement-based composite material bidirectional shearing test block with the specification of 40mm × 160 mm.
Two different wet-sprayed polymer mortars (i/ii) were prepared, i representing the wet-sprayed polymer mortar and ii representing the wet-sprayed polymer mortar with the addition of Hydroxymethylcellulose (HMC) (0.5%).
In order to increase the surface roughness, the concrete brick surface is ground and cleaned. The surface of the concrete is coated with a layer of epoxy-based interface agent, so that the brick surface is infiltrated, and the interface bonding strength between the concrete brick surface and the polymer mortar is increased.
2. Preparation of test specimens
Firstly, coating a polymer mortar layer with the thickness of 5mm on the surface of a concrete brick, and then flatly paving a carbon fiber grid on the surface of the mortar layer, wherein the bonding length of the carbon fiber grid and the mortar layer is 150 mm. The top layer of polymer mortar is coated on the surface of the carbon fiber grid, and the thickness of the top layer of polymer mortar is 10 mm. The finished specimens were left to cure under appropriate laboratory conditions for 28 days.
The samples were labeled:
I-CFN: showing a composite sample prepared using mortar i and an untreated carbon fiber mesh;
I-CFN/EP: the method comprises the following steps of (1) treating a composite material sample prepared from carbon fiber grids by using mortar I and epoxy resin structural adhesive;
I-CFN/EP-SCA: the method comprises the following steps of (1) treating a composite material sample prepared by carbon fiber grids by using mortar I and an epoxy resin structural adhesive added with SCA;
II-HMC & CFN/EP-SCA: the composite material sample prepared by treating the carbon fiber grids by using mortar II and the epoxy resin structural adhesive added with SCA is shown.
3. Mechanical Property test
The enhancement effect of the interface bonding strength of the CMCCs is verified through the results of the bidirectional shearing experiment. The shear test was carried out according to the standard Q/12CFN003, the test apparatus being a CSS-44100 electronic universal tester. The load is transferred through the fabric to the mortar matrix. In order to ensure that the direction of the load borne by the carbon fiber fabric is parallel to the concrete surface, the diameter of the round pipe of the testing tool is equal to the thickness of the concrete brick and double the thickness of the first layer of mortar. The loading rate of a testing instrument is 2mm/min, 4 groups of double-shearing test samples are prepared, 5 samples in each group are respectively I-CFN, I-CFN/EP-SCA and II-HCM & CFN/EP-SCA, and the detection results of the samples in each group are respectively recorded.
Average longitudinal shear load for each group of specimens:
I-CFN is 1089.2N;
I-CFN/EP is 3528.8N;
the I-CFN/EP-SCA is 4563.2N;
II-HCM & CFN/EP-SCA 5435.6N.
4. Conclusion of the experiment
The longitudinal shear strength can be used as a measure of the interfacial bond strength of a composite material when a stress is applied to the composite material.
The average longitudinal shear load for the I-CFN was 1089.2N. This indicates that the bond strength between the carbon fiber mesh and the mortar is very low and that slip failure of the two occurs at the interface.
The average longitudinal shear load for I-CFN/EP was 3528.8N, which is a 224.0% increase over I-CFN. The interface bonding strength of the CMCCs can be improved after the epoxy resin structural adhesive is used for surface treatment of the carbon fibers. Compared with the I-CFN sample, the load borne by the I-CFN/EP sample can continuously rise after reaching the sliding limit load, and the main reason is that the epoxy resin structural adhesive improves the chemical activity of the surface of the carbon fiber grid.
The average longitudinal shear load of the I-CFN/EP-SCA is 4563.2N, which is improved by 318.9% compared with the I-CFN and 22.7% compared with the I-CFN/EP. The SCA is shown to have obvious effect on improving the bonding strength between the carbon fiber and the epoxy resin structural adhesive. The SCA is matched with the epoxy resin structural adhesive, so that the chemical activity of the surface of the carbon fiber grid is further improved, and the bonding strength between the interfaces of the composite material is obviously improved.
The average longitudinal shear load value of the II-HMC & CFN/EP-SCA is 5435.6N, which is improved by 399.0 percent compared with I-CFN, 54.0 percent compared with I-CFN/EP and 19.1 percent compared with I-CFN/EP-SCA. HMC is added into the wet-process sprayed polymer mortar, and the HMC is rich in hydroxyl, so that when CMCCs bear external loads, uniform transmission of internal loads of the composite material is facilitated, the bearing limit load value inside the composite material is improved, and the structural strength of the composite material is enhanced.
The data comparison result proves that in the technical scheme of the invention, the introduction of SCA and HMC greatly enhances the bonding performance between the carbon fiber grids and the interface of the wet-process sprayed polymer mortar, and improves the anchoring performance of CMCCs.
5. Microscopic analysis
In order to further verify the interface bonding effect between the carbon fiber mesh and the wet-sprayed polymer mortar, the appearance of the fracture and the surface of the carbon fiber after the mechanical property test is observed and analyzed by adopting an S4800 field emission electron scanning microscope (SEM, model: PHILIPS XL30) under the working voltage of 10 kV.
The surface morphology of Carbon Fibers (CFs) embedded in a matrix in a bi-directional shear sample was characterized using SEM. A smooth surface of the carbon fiber mesh (CFN) was observed due to the chemical inertness of the carbon fiber surface. CFN without epoxy structural glue (EP) coating is difficult to have good adhesion to mortar.
The CFN treated by the EP surface is fixed in a mortar matrix, and micro gaps appear at the interface of carbon fibers and the mortar, mainly because the carbon fiber surface has poor wettability, the epoxy resin structural adhesive cannot be uniformly distributed, and the stress transmission in the matrix is interrupted. This indicates that the bond strength between the epoxy structural adhesive and the carbon fiber needs to be increased.
After the addition of SCA, there is still a diminishing gap in the interface of CFN and mortar. Meanwhile, the increase of the amount of mortar attached to the surface of the carbon fiber shows that the SCA is helpful for enhancing the bonding strength between the CFN and the EP, and the fracture occurs at the interface of the epoxy resin structural adhesive and the mortar matrix.
Compared with an I-CFN/EP-SCA sample, the addition of the HMC obviously reduces the gap at the interface between the carbon fiber and the mortar, and the HMC has a large amount of hydroxyl groups, so that the cohesive strength of the mortar is improved, and the HMC is in favor of forming chemical bonding with the modified carbon fiber. More mortar was observed to adhere to the carbon fiber surface than I-CFN/EP-SCA. SEM characterization results show that chemical activity between CFN and mortar is improved to different degrees after SCA and HMC are added.
Thus, it is further demonstrated by microscopic analysis that both SCA and HMC are effective in increasing the bond strength between the composite interfaces. The addition of SCA and HMC can obviously improve the anchoring performance of the composite material.
In the description of the present application, the description of the terms "one embodiment," "some embodiments," etc. means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (7)
1. A method for enhancing the interface strength of a carbon fiber grid reinforced cement-based composite material is characterized by comprising the following steps of:
treating the surface of a carbon fiber grid, namely adding a silane coupling agent into an epoxy resin structural adhesive, fully stirring, uniformly coating the epoxy resin structural adhesive on the surface of the carbon fiber grid, standing for a period of time, extruding the redundant epoxy resin structural adhesive on the surface of the carbon fiber grid, and curing the epoxy resin structural adhesive on the surface of the carbon fiber grid for later use;
coating inner layer mortar, coating a layer of epoxy group interface agent on the concrete base surface subjected to surface treatment, and coating a layer of wet-process spraying polymer mortar on the concrete base surface to form inner layer mortar;
laying carbon fiber grids, overlapping and laying the carbon fiber grids subjected to surface treatment on the surface of the inner layer mortar, and pressing the carbon fiber grids to embed the carbon fiber grids into the surface of the inner layer mortar;
and coating outer layer mortar, and coating a layer of wet spraying polymer mortar on the surface of the laid carbon fiber grid to form the outer layer mortar.
2. The method for enhancing interfacial strength of carbon fiber mesh reinforced cement-based composite material according to claim 1, wherein hydroxymethyl cellulose is added to the wet-sprayed polymer mortar in the step of coating inner layer mortar and the step of coating outer layer mortar.
3. The method for enhancing the interfacial strength of the carbon fiber mesh reinforced cement-based composite material according to claim 2, wherein the mass fraction of the hydroxymethyl cellulose added in the wet-sprayed polymer mortar is 0.5%.
4. The method for enhancing the interfacial strength of the carbon fiber mesh-reinforced cement-based composite material according to claim 3, wherein the silane coupling agent is added in an amount of 1% by mass in the step of treating the surface of the carbon fiber mesh, and the epoxy resin structural adhesive is stirred in an amount of A: B-3: 1.
5. The method for enhancing the interfacial strength of the carbon fiber mesh-reinforced cement-based composite material according to claim 4, wherein the curing of the carbon fiber mesh subjected to the glue extrusion in the carbon fiber mesh surface treatment step is performed at 80 ℃ for 2 hours.
6. The method for enhancing interfacial strength of carbon fiber mesh reinforced cement-based composite material according to claim 5, wherein the coating thickness of the inner layer mortar in the step of coating the inner layer mortar is 4-6 mm.
7. The method for enhancing interfacial strength of carbon fiber mesh reinforced cement-based composite material according to claim 6, wherein the coating thickness of the outer layer mortar in the step of coating the outer layer mortar is 9-11 mm.
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| CN113290972A (en) * | 2021-05-31 | 2021-08-24 | 安徽华城兴建材科技有限公司 | PVC film-coated cement board |
| CN115534431A (en) * | 2022-10-11 | 2022-12-30 | 天津工业大学 | Continuous fabric reinforced mortar composite material and preparation method thereof |
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Application publication date: 20200623 |