CN111879583B - Novel concrete-epoxy mortar combined test piece structure and manufacturing process - Google Patents
Novel concrete-epoxy mortar combined test piece structure and manufacturing process Download PDFInfo
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- CN111879583B CN111879583B CN202010648948.3A CN202010648948A CN111879583B CN 111879583 B CN111879583 B CN 111879583B CN 202010648948 A CN202010648948 A CN 202010648948A CN 111879583 B CN111879583 B CN 111879583B
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- 238000012360 testing method Methods 0.000 title claims abstract description 264
- 239000004593 Epoxy Substances 0.000 title claims abstract description 116
- 239000004570 mortar (masonry) Substances 0.000 title claims abstract description 102
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 24
- 230000007547 defect Effects 0.000 claims abstract description 30
- 239000004567 concrete Substances 0.000 claims abstract description 21
- 238000000034 method Methods 0.000 claims abstract description 14
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 64
- 229910000831 Steel Inorganic materials 0.000 claims description 31
- 239000010959 steel Substances 0.000 claims description 31
- 239000000835 fiber Substances 0.000 claims description 28
- 239000003822 epoxy resin Substances 0.000 claims description 25
- 229920000647 polyepoxide Polymers 0.000 claims description 25
- 239000011248 coating agent Substances 0.000 claims description 16
- 238000000576 coating method Methods 0.000 claims description 16
- 238000004140 cleaning Methods 0.000 claims description 13
- 239000011440 grout Substances 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 8
- 239000002131 composite material Substances 0.000 claims description 7
- 239000000654 additive Substances 0.000 claims description 6
- 230000000996 additive effect Effects 0.000 claims description 6
- 229920001821 foam rubber Polymers 0.000 claims description 5
- 238000012545 processing Methods 0.000 claims description 4
- 238000007788 roughening Methods 0.000 claims description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 2
- 239000000741 silica gel Substances 0.000 claims description 2
- 229910002027 silica gel Inorganic materials 0.000 claims description 2
- 238000009434 installation Methods 0.000 abstract description 10
- 238000005452 bending Methods 0.000 abstract description 4
- 239000010410 layer Substances 0.000 description 8
- 239000011148 porous material Substances 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 230000001680 brushing effect Effects 0.000 description 5
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 4
- 238000001035 drying Methods 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 230000002787 reinforcement Effects 0.000 description 4
- 238000011160 research Methods 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 239000011247 coating layer Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 239000012779 reinforcing material Substances 0.000 description 2
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/52—Producing shaped prefabricated articles from the material specially adapted for producing articles from mixtures containing fibres, e.g. asbestos cement
- B28B1/523—Producing shaped prefabricated articles from the material specially adapted for producing articles from mixtures containing fibres, e.g. asbestos cement containing metal fibres
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28D—WORKING STONE OR STONE-LIKE MATERIALS
- B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
- B28D1/26—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by impact tools, e.g. by chisels or other tools having a cutting edge
-
- 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
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
- C04B26/02—Macromolecular compounds
- C04B26/10—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C04B26/14—Polyepoxides
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/002—Priming paints
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B11/00—Connecting constructional elements or machine parts by sticking or pressing them together, e.g. cold pressure welding
- F16B11/006—Connecting constructional elements or machine parts by sticking or pressing them together, e.g. cold pressure welding by gluing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/36—Embedding or analogous mounting of samples
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/36—Embedding or analogous mounting of samples
- G01N2001/366—Moulds; Demoulding
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Abstract
The embodiment of the invention discloses a novel concrete-epoxy mortar combined test piece structure which comprises a first test piece, a second test piece, a seam forming accessory, a limiting accessory, epoxy mortar and a precoating layer, wherein the first test piece and the second test piece have the same cross section size, the surfaces of the first test piece and the second test piece have random opening defects and/or corner defects, the precoating layer is coated on the connecting installation surfaces of the first test piece and the second test piece, the seam forming accessory is arranged on one side of the installation surface of the first test piece, the limiting accessory is arranged on the installation surface of the first test piece, and the epoxy mortar is used for fixedly connecting the connecting installation surfaces of the first test piece and the second test piece. The embodiment of the invention also discloses a process for manufacturing the novel concrete-epoxy mortar combined test piece structure. By adopting the invention, the condition of the concrete joint surface is effectively improved, the surface of the concrete joint surface and the epoxy mortar have better cohesiveness, the mechanical properties of crack resistance, bending resistance, shear resistance and the like at the joint of the concrete member are effectively improved, and the structure has better overall performance.
Description
Technical Field
The invention relates to the fields of bridge engineering, structural engineering and structural reinforcement, in particular to a novel concrete-epoxy mortar combined test piece and a manufacturing process thereof.
Background
In recent years, with the development of economy in China, the country pays more and more attention to the research, development and popularization of prefabricated assembled structures, combined structures and reinforcement processes, and experts, scholars and enterprises at home and abroad jointly research, develop and design various assembled combined structures and reinforcement processes, so that the achievement is quite rich and the market is gradually formed. Like steel materials forming a structure by welding, bolting, etc., prefabricated units and combined units are integrated by mutual joints, and a large number of cracks existing in a reinforcement work need to be repaired, the quality of the joints or cracks playing a crucial role in the safety of the structure. At present, joints and structural cracks of prefabricated components and combined components are mostly designed and constructed through structures, students study mechanical properties of the joints and reinforcing materials more, but study on the bonding properties of the joints, the reinforcing materials and joint surfaces of the components and the crack resistance, the bending resistance, the fatigue resistance and the like of the combined components after the joints near the joint positions is not deep, and how to treat the joint interfaces to improve the mechanical properties of the joints is still in an empirical stage.
Disclosure of Invention
The technical problem to be solved by the embodiment of the invention is to provide a novel concrete-epoxy mortar combined test piece structure and a manufacturing process. The bonding performance between concrete members can be improved, so that the concrete combined test piece has better bending resistance, crack resistance and other performances, and the manufacturing process provides a method for manufacturing the structure for scientific researchers.
In order to solve the technical problem, an embodiment of the invention provides a novel concrete-epoxy mortar combined test piece structure which comprises a first test piece, a second test piece, a seam forming fitting, a limiting fitting, epoxy mortar and a pre-coating layer, wherein the first test piece and the second test piece have the same cross section size, at least one surface of the first test piece and the second test piece has an opening defect and/or a corner defect, the pre-coating layer is coated on a connecting mounting surface of the first test piece and the second test piece, the seam forming fitting is arranged on one side of the mounting surface of the first test piece, the limiting fitting is arranged on the mounting surface of the first test piece, and the epoxy mortar is used for fixedly connecting the connecting mounting surfaces of the first test piece and the second test piece.
Furthermore, the method also comprises the step of chiseling a plurality of bonding holes on the mounting surfaces of the first test piece and the second test piece.
Further, the plurality of bonding holes are arranged in an array.
And further, the steel fiber is mixed into the first test piece and the second test piece, and the length of the exposed mounting surface is 4-10 mm.
Furthermore, the test device also comprises a prefabricated groove arranged on the mounting surfaces of the first test piece and the second test piece.
Furthermore, the prefabricated grooves are a plurality of and present a criss-cross structure, the depth of the prefabricated grooves is 3mm, and the area of the prefabricated grooves is 20mm 2 。
Further, still include stock, force transducer, nut, two backing plates, test piece one, test piece two are positive to be provided with the preformed hole, the stock passes the preformed hole of test piece one, test piece two, force transducer arranges in between two backing plates, and whole cover is located the outer terminal surface of test piece one, test piece two, the nut is used for locking the stock is applyed and is done all in advance.
Furthermore, the precoating layer adopts 10wt% -30 wt% of epoxy acetone solution, wherein 1-3 parts of epoxy resin and 9-7 parts of acetone.
Further, the epoxy mortar comprises the following components in percentage by weight: epoxy mortar: additive: the aggregate is 3:1: 20.
correspondingly, the embodiment of the invention also provides a process for manufacturing the novel concrete-epoxy mortar combined test piece structure, which comprises the following steps:
s1: preparing materials for manufacturing the test piece I, the test piece II and the epoxy mortar;
s2: setting a cylindrical mold in the mold according to requirements by using the mold for manufacturing the first test piece and the second test piece, so that a preformed hole is formed in the first test piece and the second test piece;
s3: adding steel fibers when the test piece I and the test piece II are manufactured according to requirements, wherein the diameter range of the steel fibers is 0.1-0.5 mm;
s4: arranging a grout stop belt on the mounting surface when the test piece I and the test piece II are manufactured as required to form a prefabricated groove;
s5: maintaining the test piece I and the test piece II for more than 28 days;
s6: treating the mounting surface using at least one of: s61: roughening the mounting surfaces of the first test piece and the second test piece to form bonding holes, wherein the area of each bonding hole is 1/20-1/40 of the first mounting surface or the second mounting surface; s62: carrying out surface processing on the mounting surfaces of the first test piece and the second test piece doped with the steel fibers, so that the steel fibers are exposed on the surfaces, the lengths of the exposed pairs are not less than 3mm and not more than 50% of the total length of the steel fibers, and the exposed steel fibers are adjusted to form an angle of 45-90 degrees with the mounting surfaces; s63: arranging a grout stop belt at a template on the mounting surface when the test piece I and the test piece II are manufactured, forming the prefabricated groove on the mounting surface after concrete is solidified, wherein the hole depth of the prefabricated groove is at least 2mm and is not more than 5mm, and the area of the prefabricated groove is 1/10-1/30 of the area of the mounting surface;
s7: cleaning the mounting surfaces of the first test piece and the second test piece;
s8: preparing an epoxy acetone solution, wherein the concentration of epoxy resin is 10-30 wt%;
s9: smearing the epoxy acetone solution on the mounting surfaces of the first test piece and the second test piece;
s10: uniformly coating the epoxy mortar on the mounting surfaces of the first test piece and the second test piece within 60 seconds after coating, so that opening defects and corner defects are filled;
s11: the mounting surfaces of the first test piece and the second test piece are in one-to-one correspondence on the same straight line to form a combined test piece;
s12: vibrating the combined test piece;
s13: when the preformed hole is formed, an anchor rod penetrates through the preformed hole, a nut, a force sensor and a base plate are sequentially locked at two ends of the combined test piece, the anchor rod is pretensioned, and the anchor rod, the force sensor, the nut and the base plate are removed after the anchor rod is fixed for 4 hours;
s14: maintaining for more than 7 days.
The embodiment of the invention has the following beneficial effects:
(1) by carrying out a series of treatments on the concrete connection surface, particularly by adopting an epoxy acetone precoating process, the condition of the concrete connection surface can be effectively improved, so that the surface and the epoxy mortar have better cohesiveness;
(2) the structural forms and the manufacturing processes of various novel concrete-epoxy mortar combined test piece structures are provided, so that the mechanical properties of crack resistance, bending resistance, shear resistance and the like at the joint of a concrete member can be effectively improved, and the structure has better overall performance;
(3) the manufacturing method of the test piece is provided for researchers to research the structure of the novel concrete-epoxy mortar combined test piece, and the time of scientific research is saved.
Drawings
FIG. 1 is a schematic front view and a cross-sectional view of a novel concrete-epoxy mortar combined test piece structure in example 1.
FIG. 2 is a top view and a cross-sectional view of a novel concrete-epoxy mortar composite test piece structure after a precoat layer is applied to the concrete-epoxy mortar composite test piece structure in example 1.
FIG. 3 is a rear elevation view and a sectional view of a novel concrete-epoxy mortar combined test piece structure in accordance with embodiment 1, which is configured as a seam fitting.
FIG. 4 is a top view and a cross-sectional view of a novel concrete-epoxy mortar combined test piece structure of example 1 after epoxy mortar is applied.
FIG. 5 is an installation front view and a sectional view of a novel concrete-epoxy mortar combined test piece structure in embodiment 1.
FIG. 6 is a front view of a novel concrete-epoxy mortar combined test piece structure in accordance with example 1.
FIG. 7 is a front view and a cross-sectional view of a novel concrete-epoxy mortar combined test piece structure in example 2.
FIG. 8 is a top view and a cross-sectional view of a novel concrete-epoxy mortar combined test piece structure after roughening in example 2.
FIG. 9 is a top view and a cross-sectional view of a novel concrete-epoxy mortar composite test piece structure after a precoat layer is applied to the concrete-epoxy mortar composite test piece in example 2.
FIG. 10 is a rear elevation view and a sectional view of a novel concrete-epoxy mortar combined test piece structure in accordance with embodiment 2, which is provided with a seam fitting.
FIG. 11 is a top view and a cross-sectional view of a novel concrete-epoxy mortar combined test piece structure example 2 after precoat coating.
FIG. 12 is an installation front view and a sectional view of a novel concrete-epoxy mortar combined test piece structure in embodiment 2.
FIG. 13 is a front view of a novel concrete-epoxy mortar combined test piece structure in accordance with example 2.
Fig. 14 is a front schematic view and a cross-sectional view of a novel concrete-epoxy mortar combined test piece structure in example 3.
FIG. 15 is a top view and a cross-sectional view of a novel concrete-epoxy mortar composite test piece structure after a precoat layer is applied to the concrete-epoxy mortar composite test piece structure in example 3.
FIG. 16 is a rear elevation and a sectional view of a novel concrete-epoxy mortar combined test piece structure of embodiment 3, which is provided with a seam fitting.
FIG. 17 is a top view and a cross-sectional view of a novel concrete-epoxy mortar combined test piece structure, example 3, after epoxy mortar is applied.
FIG. 18 is an installation front view and a sectional view of a novel concrete-epoxy mortar combined test piece structure in embodiment 3.
FIG. 19 is a front view of a novel concrete-epoxy mortar combined test piece structure in accordance with example 3.
FIG. 20 is a front view and a cross-sectional view of a novel concrete-epoxy mortar combined test piece structure of example 4.
FIG. 21 is a top view and a cross-sectional view of a novel concrete-epoxy mortar combined test piece structure example 4 after a precoat is applied.
FIG. 22 is a rear elevation and a sectional view of a novel concrete-epoxy mortar combined test piece structure of example 4, which is provided with a seam fitting.
FIG. 23 is a top view and a cross-sectional view of a novel concrete-epoxy mortar combined test piece structure, example 4, after epoxy mortar is applied.
FIG. 24 is an installation front view and a sectional view of a novel concrete-epoxy mortar combined test piece structure in accordance with example 4.
FIG. 25 is a front view and a cross-sectional view of a novel concrete-epoxy mortar combined test piece structure, example 4, a prestressing device.
FIG. 26 is a front view of a novel concrete-epoxy mortar combined test piece structure of example 4.
The test piece comprises a first test piece 1, a first 11-bit mounting surface, a second test piece 2, a second mounting surface 21, a seam forming fitting 31, a limiting fitting 32, epoxy mortar 4, a precoat 5, a bonding hole 61, steel fibers 62, a prefabricated groove 63, a preformed hole 7, an anchor rod 81, a force sensor 82, a nut 83, a cushion plate 84, a mounting surface opening defect 101 and a mounting surface corner defect 102.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.
Example 1:
as shown in fig. 1 to 6, the novel concrete-epoxy mortar combined test piece structure comprises a first test piece 1, a first mounting surface 11, a second test piece 2, a second mounting surface 21, a seam forming fitting 31, a limiting fitting 32, epoxy mortar 4, a precoating layer 5 and a bonding hole 61, wherein the mounting surface has a random opening defect 101 and a mounting surface corner defect 102. The sizes of the test piece I1 and the test piece II 2 are both 100mm multiplied by 300mm, the concrete grade is C50, and the curing is carried out for 28 days; grinding the first mounting surface 11 and the second mounting surface 21 of the first test piece 1 and the second test piece 2 by using a grinding tool, and chiseling bonding holes 61, wherein the area of each bonding hole 61 is 50mm 2 Left and right, the depth is 2 mm; the bonding holes are used for increasing the bonding area of the epoxy mortar and the concrete surface and improving the mechanical property of the joint, clear water and a blower are used for cleaning and cleaning the mounting surfaces I11 and II 21 of the test piece I1 and the test piece II 2, and after drying, alcohol with the concentration of 95% is used for further cleaning the treated mounting surfaces I11 and II 21; preparing 10wt% of epoxy resin acetone solution (stirring for 1 min), and adding epoxy resinUniformly coating the acetone solution on the first mounting surface 11 and the second mounting surface 21, and uniformly brushing for 10 times, wherein each time lasts for 1 second; a seam forming part 31 is arranged on the mounting surface I11 coated with the epoxy resin acetone solution, the seam forming part 31 is made of foam rubber, the thickness of the seam forming part 31 is 2.5mm, the length is 100mm, the width is 20mm, limiting parts 32 are arranged at two corners of the mounting surface I11, the thickness of the limiting parts 32 is 2.5mm, and the area of the limiting parts 32 is 10mm 2 Left and right; the limiting fittings are arranged at the corners of the first mounting surface and are matched with the seam forming fittings to play a role in supporting the weight of the upper part and ensuring the thickness of the seam; the height of the limiting accessory is the same as the thickness of the sewing accessory, and the limiting accessory is made of a silica gel material which can be adsorbed on concrete or other metal materials; a silicone material is preferred in this embodiment.
Example 2:
as shown in fig. 7 to 13, a novel concrete-epoxy mortar combined test piece structure comprises a first test piece 1, a first mounting surface 11, a second test piece 2, a second mounting surface 21, a seam forming fitting 31, a limiting fitting 32, epoxy mortar 4, a precoat layer 5, steel fibers 62, a mounting surface opening defect 101 and a mounting surface corner defect 102. The sizes of the first test piece 1 and the second test piece 2 are both 100mm multiplied by 300mm, the grade of concrete is C50, the maintenance is carried out for 28 days, a proper amount of steel fiber 62 is doped when the first test piece 1 and the second test piece 2 are manufactured, 5kg to 15kg of steel fiber is placed in each cubic meter of concrete material, the diameter of the steel fiber is 0.2mm, and the length of the steel fiber is 20 mm; polishing the first mounting surface 11 and the second mounting surface 21 of the first test piece 1 and the second test piece 2 by using a polishing tool to expose the steel fibers 62 and expose the long steel fibersThe degree is 4mm-10 mm; cleaning the first mounting surface 11 and the second mounting surface 21 of the first test piece 1 and the second test piece 2 by using clean water and a blower, and after drying, further cleaning the treated first mounting surface 11 and the treated second mounting surface 21 by using 90% alcohol; preparing 15 wt% of epoxy resin acetone solution (stirring for 1 minute), uniformly coating the epoxy resin acetone solution on the first mounting surface 11 and the second mounting surface 21, and uniformly brushing for 10 times, wherein each time is 1 second; a seam forming part 31 is arranged on the mounting surface I11 coated with the epoxy resin acetone solution, the seam forming part 31 is made of foam rubber, the thickness of the seam forming part 31 is 5mm, the length of the seam forming part is 100mm, the width of the seam forming part is 30mm, limiting parts 32 are arranged at two corners of the mounting surface I11, the thickness of the limiting parts 32 is 5mm, and the area of the limiting parts 32 is 15mm 2 Left and right; coating epoxy mortar 4 on the first mounting surface 11 coated with the epoxy resin acetone solution, and sealing macroscopic pores on the second mounting surface 21 coated with the epoxy resin acetone solution by using a small amount of epoxy mortar 4, wherein the macroscopic pores are required to cover mounting surface opening defects 101 and mounting surface corner defects 102 on the first mounting surface 11 and the second mounting surface 21, and the mixing ratio of the epoxy mortar is as follows: 3 parts of epoxy value, 1 part of additive and 20 parts of aggregate; rotating the second test piece 2 by 90 degrees to cover the first test piece 1, and ensuring that the second test piece 2 is aligned with the first test piece 1; vibrating the upper part of the second test piece 2 for 5min to remove air bubbles in the epoxy mortar 4; the test was carried out after 7 days of curing.
Example 3:
as shown in fig. 14 to 19, a novel concrete-epoxy mortar combined test piece structure comprises a first test piece 1, a first mounting surface 11, a second test piece 2, a second mounting surface 21, a seam forming fitting 31, a limiting fitting 32, epoxy mortar 4, a precoat layer 5, a prefabricated groove 63, a mounting surface opening defect 101 and a mounting surface corner defect 102. The sizes of the first test piece 1 and the second test piece 2 are both 100mm multiplied by 300mm, the concrete brand is C50, the maintenance is carried out for 28 days, when the first test piece 1 and the second test piece 2 are manufactured, the grout stopping belts are arranged at the positions of the templates of the first mounting surface 11 and the second mounting surface 21, after the first test piece 1 and the second test piece 2 are solidified, the templates and the grout stopping belts are removed, prefabricated grooves 63 are formed in the first mounting surface 11 and the second mounting surface 21, the depth of each prefabricated groove 63 is 3mm, and the area of each prefabricated groove is 20mm 2 Adopting clean water and blower to test piece 1 and test pieceSecondly, performing ash removal and cleaning on the first mounting surface 11 and the second mounting surface 21 of the second mounting surface 2, and after drying, further cleaning the first mounting surface 11 and the second mounting surface 21 which are treated by adopting 90% alcohol; preparing 15 wt% of epoxy resin acetone solution (stirring for 1 minute), uniformly coating the epoxy resin acetone solution on the first mounting surface 11 and the second mounting surface 21, and uniformly brushing for 10 times, wherein each time is 1 second; a seam forming part 31 is arranged on the mounting surface I11 coated with the epoxy resin acetone solution, the seam forming part 31 is made of foam rubber, the thickness of the seam forming part 31 is 5mm, the length of the seam forming part is 100mm, the width of the seam forming part is 30mm, limiting parts 32 are arranged at two corners of the mounting surface I11, the thickness of the limiting parts 32 is 5mm, and the area of the limiting parts 32 is 15mm 2 Left and right; coating epoxy mortar 4 on the first mounting surface 11 coated with the epoxy resin acetone solution, and sealing the macroscopic pores on the second mounting surface 21 coated with the epoxy resin acetone solution by using a small amount of epoxy mortar 4, wherein the macroscopic pores are required to cover the mounting surface opening defects 101 and the mounting surface corner defects 102 on the first mounting surface 11 and the second mounting surface 21, and the mixing ratio of the epoxy mortar is as follows: 3 parts of epoxy value, 1 part of additive and 20 parts of aggregate; rotating the second test piece 2 by 90 degrees to cover the first test piece 1, and ensuring that the second test piece 2 is aligned with the first test piece 1; vibrating the upper part of the second test piece 2 for 5min to remove air bubbles in the epoxy mortar 4; the test was carried out after 7 days of curing.
Example 4
As shown in fig. 20 to 26, a novel concrete-epoxy mortar combined test piece structure comprises a first test piece 1, a first mounting surface 11, a second test piece 2, a second mounting surface 21, a seam forming fitting 31, a limiting fitting 32, epoxy mortar 4, a precoat layer 5, a preformed hole 7, an anchor rod 81, a force sensor 82, a nut 83, a backing plate 84, a mounting surface opening defect 101 and a mounting surface corner defect 102. The sizes of a first test piece 1 and a second test piece 2 are both 100mm multiplied by 300mm, the concrete brand is C50, the maintenance is carried out for 28 days, when the first test piece 1 and the second test piece 2 are manufactured, a cylindrical mold is added in the center of the first test piece 1 and the second test piece 2, after the first test piece 1 and the second test piece 2 are solidified, the template is removed to form a reserved hole 7, and the diameter of the reserved hole is 20 mm; cleaning the first mounting surface 11 and the second mounting surface 21 of the first test piece 1 and the second test piece 2 by using clean water and a blower, and after drying, treating the test pieces by using 90% alcoholFurther cleaning the cleaned first mounting surface 11 and the second mounting surface 21; preparing 15 wt% of epoxy resin acetone solution (stirring for 1 minute), uniformly coating the epoxy resin acetone solution on the first mounting surface 11 and the second mounting surface 21, and uniformly brushing for 10 times, wherein each time is 1 second; a seam forming part 31 is arranged on the mounting surface I11 coated with the epoxy resin acetone solution, the seam forming part 31 is made of foam rubber, the thickness of the seam forming part 31 is 5mm, the length of the seam forming part is 100mm, the width of the seam forming part is 30mm, limiting parts 32 are arranged at two corners of the mounting surface I11, the thickness of the limiting parts 32 is 5mm, and the area of the limiting parts 32 is 15mm 2 Left and right; arranging a polymer film on the periphery of the preformed hole 7 so as to prevent the epoxy mortar from flowing into the air; coating epoxy mortar 4 on the first mounting surface 11 coated with the epoxy resin acetone solution, and sealing the macroscopic pores on the second mounting surface 21 coated with the epoxy resin acetone solution by using a small amount of epoxy mortar 4, wherein the macroscopic pores are required to cover the mounting surface opening defects 101 and the mounting surface corner defects 102 on the first mounting surface 11 and the second mounting surface 21, and the mixing ratio of the epoxy mortar is as follows: 3 parts of epoxy value, 1 part of additive and 20 parts of aggregate; rotating the test piece II 2 by 90 degrees to cover the test piece I1, and ensuring that the test piece II 2 is aligned with the test piece I1; vibrating the upper part of the second test piece 2 for 5min to remove air bubbles in the epoxy mortar 4; the anchor rod 81, the force sensor 82, the nut 83 and the backing plates 84 penetrate through the preformed hole 7, prestress 2kN is applied to the anchor rod 81, the force sensor 82 is located between the two backing plates 84, the anchor rod 81, the force sensor 82, the nut 83 and the backing plates 84 are removed after stabilization for 4 hours, and the test is carried out after 7 days of maintenance.
Example 5:
the manufacturing process comprises the following steps:
(1) and preparing materials for manufacturing the test piece I, the test piece II and the epoxy mortar.
(2) And (3) manufacturing a first test piece and a second test piece, and if prestress is required to be applied, the die is required to comprise a cylindrical die (the diameter of the cylindrical die is 1/10-1/5 of the smallest section size of the first test piece and the second test piece).
(3) According to the requirement of the test, the steel fiber (the diameter range of the steel fiber is 0.1 mm-0.5 mm, and the steel fiber is made of rigid strength steel with better adhesive property with concrete and epoxy mortar) can be added, and a grout stopping belt can be arranged at the mould of the first installation surface and the second installation surface to pour concrete.
(4) And maintaining the test piece I and the test piece II for more than 28 days.
(5) And processing the first mounting surface and the second mounting surface of the first test piece and the second test piece which are maintained. The processing method comprises the following steps: (5.1) roughening the first mounting surface and the second mounting surface to form bonding holes, wherein the depth of each bonding hole is at least 2mm and cannot exceed 5mm, and the area of each bonding hole is 1/20-1/40 of the first mounting surface or the second mounting surface; (5.2) performing surface processing on the first mounting surface and the second mounting surface of the first test piece and the second test piece which are doped with the steel fibers to ensure that the steel fibers are exposed out of the surfaces, the exposed length is not less than 3mm and cannot exceed 50% of the total length of the steel fibers, and adjusting the exposed steel fibers to form an angle of 45-90 degrees with the first mounting surface and the second mounting surface; (5.3) when the first test piece and the second test piece are prefabricated, setting grout stop belts at the templates of the first mounting surface and the second mounting surface, forming prefabricated grooves on the first mounting surface and the second mounting surface after concrete is solidified to form the first test piece and the second test piece, wherein the hole depth of each prefabricated groove is at least 2mm and cannot exceed 5mm, and the area of each prefabricated groove is 1/10-1/30 of the area of the first mounting surface or the area of the second mounting surface; (5.4) taking out the cylindrical mold to form the preformed hole; (5.5) the first mounting surface and the second mounting surface may be treated by two or more of the treatments (5.1) to (5.4).
(6) And (3) cleaning the mounting surface I and the mounting surface II which are treated in the step (5) by adopting a method of spraying clear water by a water pump.
(7) And after the first mounting surface and the second mounting surface are naturally dried, further cleaning the surfaces of the first mounting surface and the second mounting surface by using alcohol with the purity of more than 90 percent.
(8) Preparing epoxy acetone solution, wherein the concentration of epoxy resin is 10-30 wt%, namely 1-3 parts of epoxy resin and 9-7 parts of acetone.
(9) Coating epoxy acetone solution on the treated mounting surface I and the mounting surface II, and brushing for 10-15 times as required, wherein the speed is controlled to be about 1 second and 1 time;
(10) and after the pre-coating is coated on the first mounting surface and the second mounting surface within 60 seconds, the epoxy mortar needs to be uniformly coated on the first mounting surface, a small amount of epoxy mortar is used for coating the second mounting surface, and the mounting surface opening defects and mounting surface corner defects which are visible to the naked eye on the second mounting surface are ensured to be filled with the epoxy mortar. When the epoxy mortar is coated on the edge of the seam forming fitting, attention needs to be paid to the fullness of the epoxy mortar on the edge of the seam forming fitting so as to avoid bubbles.
(11) And rotating the second test piece by 90 degrees, wherein the second mounting surface is required to be ensured to correspond to the first mounting surface, and mounting the second test piece on the first test piece, wherein four edges of the second test piece and four edges of the first test piece are required to be in one-to-one correspondence and are positioned on the same straight line to form a combined test piece.
(12) And vibrating the combined test piece to ensure that the test piece I and the test piece II are tightly attached to the epoxy mortar without bubbles. If for the needs that take the preformed hole add the test piece of prestressing force, still need will stock, force transducer, nut, backing plate pass the combination test piece of treating the preformed hole, and right the stock carries out pretension, stabilizes 4 hours after, demolishs stock, force transducer, nut, backing plate.
(13) And curing for more than 7 days to obtain a novel concrete-epoxy mortar combined test piece structure.
While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiment, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (6)
1. A method for manufacturing a concrete-epoxy mortar combined test piece is characterized in that,
the concrete-epoxy mortar combined test piece comprises a first test piece, a second test piece, a seam forming fitting, a limiting fitting, epoxy mortar and a precoating layer, wherein the first test piece and the second test piece have the same cross section size, the surfaces of the first test piece and the second test piece have random opening defects and/or corner defects, the precoating layer is coated on the connecting mounting surfaces of the first test piece and the second test piece, the seam forming fitting is arranged on one side of the mounting surface of the first test piece, the limiting fitting is arranged on two corners of the mounting surface of the first test piece, the epoxy mortar is used for fixedly connecting the connecting mounting surfaces of the first test piece and the second test piece, the precoating layer adopts 10wt% -30 wt% of epoxy acetone solution, 1-3 parts of epoxy resin and 9-7 parts of acetone are adopted, and the epoxy mortar comprises the following components in proportion: epoxy mortar: additive: the aggregate is 3:1: 20; the seam forming accessory is made of foam rubber, the limiting accessory is made of a silica gel material capable of being adsorbed on concrete, the limiting accessory is matched with the seam forming accessory to play a role in supporting the weight of the upper part and ensuring the thickness of a seam, and the height of the limiting accessory is the same as the thickness of the seam forming accessory;
the method for manufacturing the concrete-epoxy mortar combined test piece comprises the following steps:
s1: preparing materials for manufacturing the test piece I, the test piece II and the epoxy mortar;
s2: setting a cylindrical mold in the mold according to requirements by using the mold for manufacturing the first test piece and the second test piece, so that a preformed hole is formed in the first test piece and the second test piece;
s3: adding steel fibers when the test piece I and the test piece II are manufactured according to requirements, wherein the diameter range of the steel fibers is 0.1 mm-0.5 mm;
s4: arranging a grout stop belt on the mounting surface when the test piece I and the test piece II are manufactured as required to form a prefabricated groove;
s5: maintaining the test piece I and the test piece II for more than 28 days;
s6: treating the mounting surface using at least one of: s61: roughening the mounting surfaces of the first test piece and the second test piece to form bonding holes, wherein the area of each bonding hole is 1/20-1/40 of the area of the mounting surface; s62: performing surface processing on the mounting surfaces of the first test piece and the second test piece doped with the steel fibers to enable the steel fibers to be exposed out of the surfaces, wherein the exposed length is not less than 3mm and not more than 50% of the total length of the steel fibers, and the exposed steel fibers are adjusted to form an angle of 45-90 degrees with the mounting surfaces; s63: arranging a grout stop belt at a template on the mounting surface when the test piece I and the test piece II are manufactured, forming the prefabricated groove on the mounting surface after concrete is solidified, wherein the hole depth of the prefabricated groove is at least 2mm and is not more than 5mm, and the area of the prefabricated groove is 1/10-1/30 of the area of the mounting surface;
s7: cleaning the mounting surfaces of the first test piece and the second test piece;
s8: preparing an epoxy acetone solution, wherein the concentration of epoxy resin is 10-30 wt%;
s9: smearing the epoxy acetone solution on the mounting surfaces of the first test piece and the second test piece;
s10: uniformly coating the epoxy mortar on the mounting surfaces of the first test piece and the second test piece within 60 seconds after coating, so that the random opening defects and/or corner defects are filled;
s11: the mounting surfaces of the first test piece and the second test piece are in one-to-one correspondence on the same straight line to form a combined test piece;
s12: vibrating the combined test piece;
s13: when the preformed hole is formed, an anchor rod penetrates through the preformed hole, a nut, a force sensor and a base plate are sequentially locked at two ends of the combined test piece, the anchor rod is pretensioned, and the anchor rod, the force sensor, the nut and the base plate are removed after the anchor rod is fixed for 4 hours;
s14: maintaining for more than 7 days.
2. The method for manufacturing the concrete-epoxy mortar combined test piece according to claim 1, wherein the mounting surfaces of the first test piece and the second test piece are chiseled with a plurality of bonding holes.
3. The method of making a concrete-epoxy mortar composite specimen according to claim 2, wherein the plurality of bonding holes are arranged in an array.
4. According to the claimsThe method for manufacturing the concrete-epoxy mortar combined test piece according to the claim 1 is characterized in that the prefabricated grooves are a plurality of and have a criss-cross structure, the depth of the prefabricated grooves is 3mm, and the area of the prefabricated grooves is 20mm 2 。
5. The method for manufacturing a concrete-epoxy mortar combined test piece according to claim 1, wherein the length of the exposed steel fibers is 4-10 mm.
6. The method for manufacturing the concrete-epoxy mortar combined test piece according to claim 1, further comprising an anchor rod, a force sensor, a nut and two base plates, wherein a reserved hole is formed in the center of the first test piece and the center of the second test piece, the anchor rod penetrates through the reserved hole of the first test piece and the reserved hole of the second test piece, the force sensor is arranged between the two base plates and integrally sleeved on the outer end faces of the first test piece and the second test piece, and the nut is used for locking the anchor rod and applying pre-applied force.
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