CN116675494B - Preparation and repair method of repair material with high interface bonding performance and low bone slurry ratio - Google Patents
Preparation and repair method of repair material with high interface bonding performance and low bone slurry ratio Download PDFInfo
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- CN116675494B CN116675494B CN202310660695.5A CN202310660695A CN116675494B CN 116675494 B CN116675494 B CN 116675494B CN 202310660695 A CN202310660695 A CN 202310660695A CN 116675494 B CN116675494 B CN 116675494B
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- 239000000463 material Substances 0.000 title claims abstract description 90
- 230000008439 repair process Effects 0.000 title claims abstract description 58
- 238000000034 method Methods 0.000 title claims abstract description 30
- 239000002002 slurry Substances 0.000 title claims abstract description 27
- 210000000988 bone and bone Anatomy 0.000 title claims abstract description 16
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 239000004567 concrete Substances 0.000 claims abstract description 36
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 41
- 239000004575 stone Substances 0.000 claims description 39
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 29
- 239000004576 sand Substances 0.000 claims description 29
- 239000004568 cement Substances 0.000 claims description 27
- 229910000831 Steel Inorganic materials 0.000 claims description 18
- 239000010959 steel Substances 0.000 claims description 18
- 239000003638 chemical reducing agent Substances 0.000 claims description 17
- 239000000835 fiber Substances 0.000 claims description 16
- 229910021487 silica fume Inorganic materials 0.000 claims description 16
- 239000002994 raw material Substances 0.000 claims description 8
- 239000002086 nanomaterial Substances 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 5
- 238000005266 casting Methods 0.000 claims description 4
- 238000011049 filling Methods 0.000 claims description 4
- 238000004381 surface treatment Methods 0.000 claims description 4
- 239000011398 Portland cement Substances 0.000 claims description 3
- 229910010413 TiO 2 Inorganic materials 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 2
- 230000003746 surface roughness Effects 0.000 claims description 2
- 239000011374 ultra-high-performance concrete Substances 0.000 description 17
- 238000003756 stirring Methods 0.000 description 11
- 238000002156 mixing Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 6
- 238000010276 construction Methods 0.000 description 5
- 238000005336 cracking Methods 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000004570 mortar (masonry) Substances 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 239000002639 bone cement Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
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- 230000003628 erosive effect Effects 0.000 description 2
- XZWYZXLIPXDOLR-UHFFFAOYSA-N metformin Chemical compound CN(C)C(=N)NC(N)=N XZWYZXLIPXDOLR-UHFFFAOYSA-N 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
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Classifications
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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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- 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
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/52—Multiple coating or impregnating multiple coating or impregnating with the same composition or with compositions only differing in the concentration of the constituents, is classified as single coating or impregnation
-
- 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
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/60—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only artificial stone
- C04B41/61—Coating or impregnation
- C04B41/70—Coating or impregnation for obtaining at least two superposed coatings having different compositions
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention belongs to the field of concrete, and provides a preparation and repair method of a repair material with high interface bonding performance and low slurry bone ratio. The method of the invention eliminates the slurry shortage phenomenon of the repairing interface, increases the bonding area of the repairing material and the old concrete, enhances the mechanical biting force of the repairing interface and improves the bonding performance of the repairing interface.
Description
Technical Field
The invention belongs to the field of concrete, and particularly relates to a preparation method of a cement-based repair material.
Background
The disclosure of this background section is only intended to increase the understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art already known to those of ordinary skill in the art.
In a severe service environment, aging diseases are easy to occur to the concrete, the problem that the concrete has insufficient bearing capacity and durability is increasingly outstanding, and the economic loss is huge. Concrete in a severe environment is subjected to external load, water flow scouring, temperature action and other adverse factors in the service process, is easily damaged, and generally faces a repair problem in order to ensure normal service and even super service of a concrete structure, and a repair interface belongs to a weak area in a repair system. Because of the side wall effect of the interface, calcium hydroxide is enriched, and the repairing interface is loose and porous, so that the interface is weak, in addition, the repairing interface is a multi-element coupling result of chemical cementing force and mechanical biting force, the side wall effect of the traditional repairing material is difficult to break, the durability of the traditional repairing material is insufficient, and the problem of repeated repairing easily occurs.
Ultra-high performance concrete (UHPC) has ultra-high mechanical properties, toughness and excellent durability. The excellent mechanical properties and durability of UHPC make it have a high potential to improve the durability of the infrastructure and solve the problem of "repeated" repairs. The UHPC is used for repairing the damaged concrete structure, so that the bearing capacity can be enhanced, and the erosion of harmful media to the concrete can be reduced, therefore, the UHPC is adopted for repairing one of the viable ways for prolonging the service life of important infrastructure, the silica fume in the ultra-high-performance concrete has the pozzolan effect, the interface barrier effect can be weakened, and the repairing interface is compact due to the low water-gel ratio. However, as the UHPC water gel is lower, the dosage of the cementing material is large, so that the early shrinkage of the UHPC is larger, and the repair interface early belongs to a weak area, the repair shrinkage of the UHPC can bring about micro cracks of the interface, reduce the bonding performance of the interface and even cause debonding of the interface or cracking of the UHPC; in addition, UHPC is doped with a large amount of silica fume, the system water gel is lower, the UHPC viscosity is high in the pouring construction process, so that the vibration is not compact, and the interface has obvious defects of bubbles, so that the interface is weak and easy to crack.
Disclosure of Invention
In order to solve the problems, the invention provides a preparation and repair method of a repair material with high interface bonding performance and low bone cement ratio.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
in a first aspect of the present invention, there is provided a method for preparing and repairing a repair material having high interfacial adhesion and low bone cement ratio, comprising:
carrying out surface treatment on the concrete to be repaired until the surface of the concrete is rough;
casting a first layer of repair material with the thickness of 1-4 cm on the repair surface perpendicular to the repair surface support template, wherein the first layer of repair material is mortar or clean slurry doped with silica fume;
putting coarse aggregate with the grain diameter of 5-10mm into the first layer of repairing material, and pressing broken stone into the slurry until the aggregate is pressed to the repairing surface to form a first layer of repairing material layer;
and (3) throwing coarse aggregate with the grain diameter of 5-20mm into the upper part of the first repairing material layer, throwing and stacking in layers, wherein the stacking thickness of each layer is 10-20cm, burying grouting pipes in each layer, grouting the grouting pipes from bottom to top in an S-shaped distributed calandria, and curing after the slurry and the thrown aggregate are fully combined.
Aiming at the problems that the compactness of the existing repairing interface is poor, the large-surface repairing pavement is cracked due to shrinkage of UHPC repairing materials, the construction is difficult due to high UHPC viscosity, the invention provides a two-layer repairing design, wherein the first layer is paved with slurry firstly, then crushed stone is pressed in, the second layer is piled up in layers, then grouting is carried out from bottom to top, the repairing layer 1 and the repairing layer 2 are both in flow state pouring, the repairing layers can be fused well, and the condition of weakness between the repairing layers does not exist; meanwhile, the repairing layer 1 adopts low water-gel ratio, silica fume is doped, the repairing material and the old concrete have higher interface bonding performance, the repairing layer 2 is doped with steel fibers and nano materials, and the pavement has higher fatigue performance and wear resistance, so that the problems of large shrinkage, large viscosity and easiness in cracking of a large-area paving and decorating composite layer caused by the doping amount of the high cementing material and the silica fume in the conventional UHPC repairing are effectively solved.
In a second aspect of the invention, there is provided a high interfacial adhesion and low bone cement ratio repair material prepared by the method described above.
In a third aspect of the invention, there is provided the use of a repair material as described above in the repair of a damaged concrete structure.
The beneficial effects of the invention are that
(1) The method of the invention eliminates the slurry shortage phenomenon of the repairing interface, increases the bonding area of the repairing material and the old concrete, enhances the mechanical biting force of the repairing interface and improves the bonding performance of the repairing interface.
(2) The method of the invention ensures that the repair interface is compact, improves the durability of the interface and improves the capability of the repair interface for resisting the erosion of harmful media.
(3) The method has the advantages that the adopted slurry bones are relatively low, the requirement that cement paste wraps aggregate to form good workability is avoided, the consumption of cementing materials is reduced, the construction process is simplified, the construction dry-wet separation is realized, the overall cost is reduced, and the economic benefit is obtained.
(4) The method effectively solves the shrinkage cracking caused by large-area pavement, has low slurry-bone ratio, uses less cementing material, has smaller shrinkage caused by shrinkage of the cementing material, and reduces the risk of cracking in the large-area repair pavement application process.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention.
FIG. 1 concrete substrate surface treatment;
FIG. 2 casting mortar and net grout in layer 1 repair material;
FIG. 3 is a casting of 1 layer of repair material pressed with coarse aggregate;
the repairing material layer 1 part of fig. 4 stacks coarse aggregate;
FIG. 5 repair material layer 2 preparation;
fig. 6 is a repair interface diagram of examples 1 and 2 and comparative examples 1 and 2 according to the present invention, wherein a: repair interface, B in example 1: the interface, C: repairing interface of control group 1, D: control group 2 restores the interface.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
A preparation and repair method of a repair material with high interface bonding performance and low bone slurry ratio comprises the following steps:
step 1: the concrete to be repaired is subjected to surface treatment, the surface is repaired by adopting high-pressure water flow treatment, the water pressure is treated at 35-50 MPa, soil impurities and loose stones on the surface of the old concrete are cleaned until the surface of the concrete is rough, the surface roughness of the concrete is evaluated by adopting a sand filling method, and the average sand filling depth is 5-1.5 cm. As shown in fig. 1.
Step 2: and (3) vertically repairing the surface support template, pouring a first layer of repairing material on the repairing surface, wherein the poured repairing material is mortar or clean mortar, and the thickness of the first layer of repairing material layer is 1-4 cm, as shown in fig. 2.
Step 3: the method comprises the steps of putting coarse aggregate with the grain size of 5-10mm into a first layer of repairing material, pressing broken stone into slurry, and combining the broken stone with the slurry until the aggregate is pressed to the repairing surface. As shown in fig. 3.
Step 4: coarse aggregate with the grain diameter of 5-20mm is put in the upper part of the first layer of repairing material, and is piled on the surface of the first layer of repairing material. As shown in fig. 4.
Step 5: the method comprises the steps of layering and stacking coarse aggregate with the thickness of 5-20mm, burying grouting pipes with the thickness of 10-20cm in each layer, wherein each grouting pipe is made of steel pipes with the thickness of 1-2mm, holes are drilled at equal intervals of 20cm-40cm, S-shaped distributed calandria is displayed, grouting is sequentially conducted from the pipes arranged at the bottom layer to the grouting pipes at the upper part respectively, grouting is conducted through pipe orifices, the slurry spreads from bottom to top, the slurry and the put aggregate can be well contacted under the action of gravity, the phenomenon of shortage of slurry is avoided, broken stone stacking is achieved firstly, then grouting is conducted, and dry-wet separation of a construction process is achieved. The repairing layer 2 and the repairing layer 1 are both in fluid pouring, can be well fused, and have no condition of weak repairing layers. As shown in fig. 5.
In order to increase the flexural strength and fatigue resistance of the repair material, in some embodiments, steel fibers are uniformly added with 5-20mm crushed stone, and the adding amount is 1% -3% of the volume mixing amount. The traditional preparation method has 3% of steel fiber mixing amount, greatly reduces fluidity and affects workability, and the method does not affect workability of steel fiber reinforced concrete, especially concrete molding (mixing amount exceeds 2.5%) under high mixing amount. The cementing material amount adopted by the repairing material is 1/4-1/2 of the dosage of the cementing material for preparing the concrete by the traditional concrete.
In order to obtain the high interface bonding performance of the repairing material and the old concrete, the repairing layer 1 adopts a low water-gel ratio, a gel system is doped with silica fume, and in order to obtain the high fatigue performance and the wear resistance of the pavement, the repairing layer 2 is doped with steel fibers and nano materials. Thus, in some embodiments, the first layer repair material is comprised of the following raw materials in parts by weight: 350-600 parts of cement, 22-60 parts of silica fume, 110-160 parts of water, 8-12 parts of water reducer, 0-350 parts of sand and 1300-1800 parts of broken stone.
Preferably, the cement is Portland cement;
preferably, the sand is one or more of river sand, machine-made sand and river sand, and the grain diameter is not more than 5mm.
Preferably, the crushed stone has a particle size of 5-10mm. The slurry material is prepared, paved and then crushed stone is pressed in.
In some embodiments, the second layer repair material is composed of the following raw materials in parts by weight: 300-600 parts of cement, 3-6 parts of nano material, 120-160 parts of water, 10-25 parts of water reducer, 0-350 parts of sand, 1000-2600 parts of crushed stone and 1-3% of steel fiber by volume.
Preferably, the cement is Portland cement.
Preferably, the particle size of the crushed stone is 5-20mm,
preferably, the steel fiber is copper plating wave-shaped optical fiber with the diameter of 13-14 mm;
preferably, the nanomaterial is a pozzolanic effect nano SiO 2 Nano TiO of non-pozzolanic effect 2 。
The invention will now be described in further detail with reference to the following specific examples, which should be construed as illustrative rather than limiting.
Example 1
The repairing material with high interface bonding performance and low slurry bone ratio is prepared from two layers of repairing materials, wherein the repairing layer 1 consists of 430 parts of cement, 42 parts of silica fume, 287 parts of sand, 1500 parts of broken stone, 123 parts of water and 9 parts of water reducing agent according to mass fraction. The repairing layer 2 consists of 400 parts of cement and nano SiO according to mass fraction 2 2 parts of sand 300 parts, 1600 parts of broken stone, 130 parts of water, 10 parts of water reducer and 90 parts of steel fiber
The preparation method comprises the following steps: mixing cement, silica fume, water and a water reducing agent for 4min, adding sand for stirring for 4min, pouring the mixture on a pretreated repairing surface, paving, pressing broken stone, pouring broken stone for 4cm in thickness of the repairing material layer 1, paving broken stone aggregate for the repairing material layer 2 on the repairing material layer 1, uniformly scattering steel fibers while paving broken stone, paving a grouting pipe when the stacking thickness of each layer is 15cm, paving four layers altogether, and paving cement and nano SiO for the repairing material layer 2 2 Mixing and stirring water and a water reducing agent for 4min, adding sand and stirring for 4min, and sequentially grouting upwards from a bottom grouting pipe through a pressure pump until the slurry fills the aggregate gaps.
Example 2
The high-interface bonding performance and low-slurry bone ratio repairing material is prepared from two layers of repairing materials, wherein the repairing layer 1 comprises 400 parts of cement, 80 parts of silica fume and 300 parts of sand according to mass fraction1400 parts of broken stone, 135 parts of water and 9 parts of water reducer. The repairing layer 2 consists of 420 parts of cement and nano SiO according to mass fraction 2 3 parts of sand 350 parts, crushed stone 1500 parts, water 135 parts, water reducer 10 parts, steel fiber 156 parts and the composition
The preparation method comprises the following steps: mixing cement, silica fume, water and a water reducing agent for 4min, adding sand for stirring for 4min, pouring the mixture on a pretreated repairing surface, paving, pressing broken stone, pouring broken stone for 3cm in thickness of the repairing material layer 1, paving broken stone aggregate for the repairing material layer 2 on the repairing material layer 1, uniformly scattering steel fibers while paving broken stone, paving a grouting pipe when the stacking thickness of each layer is 15cm, paving four layers altogether, and paving cement and nano SiO for the repairing material layer 2 2 Mixing and stirring water and a water reducing agent for 4min, adding sand and stirring for 4min, and sequentially grouting upwards from a bottom grouting pipe through a pressure pump until the slurry fills the aggregate gaps.
Example 3
The difference from example 1 is that the first layer repair material is composed of the following raw materials in parts by weight: 350 parts of cement, 22 parts of silica fume, 110 parts of water, 8 parts of water reducer and 1300 parts of crushed stone.
The second layer of repairing material consists of the following raw materials in parts by weight: 300 parts of cement and nano TiO 2 3 parts of water 120 parts, 10 parts of water reducer, 1000 parts of crushed stone and 1% by volume of steel fiber.
Example 4
The difference from example 1 is that the first layer repair material is composed of the following raw materials in parts by weight: 600 parts of cement, 60 parts of silica fume, 160 parts of water, 12 parts of water reducer, 350 parts of sand and 1800 parts of crushed stone.
The second layer of repairing material consists of the following raw materials in parts by weight: 600 parts of cement and nano TiO 2 6 parts of water 160 parts, 25 parts of water reducer, 350 parts of sand, 2600 parts of broken stone and 3% of steel fiber by volume.
Control group 1
The preparation of the common concrete comprises 396 parts of cement, 689 parts of sand, 1200 parts of broken stone and 190 parts of water according to mass fraction, and the preparation process is as follows: mixing and stirring cement, sand and broken stone for 5min, pouring water and stirring for 5min, repairing and pouring common concrete on the pretreated repairing surface, vibrating and compacting.
Control group 2
The preparation of the ultra-high performance concrete comprises 920 parts of cement, 276 parts of silica fume, 1012 parts of sand and 156 parts of steel fiber according to mass fraction, and the preparation process comprises the following steps: mixing and stirring cement, silica fume, water and a water reducing agent for 5min, pouring sand and stirring for 5min, pouring steel fibers and stirring for 10min, pouring the mixture on a pretreated repairing surface, vibrating and compacting.
Result analysis one: the repair materials of the examples and the control group were each subjected to film curing for 28d, and the mechanical and economic properties of the repair materials were analyzed as shown in Table 1 below.
And testing the elastic modulus and the compressive strength of the repairing material according to the GB/T50081-2019 concrete physical and mechanical property test method standard.
The repair material shrinkage adopts a fiber grating sensor, the size of a test piece is 150mm multiplied by 100mm multiplied by 300mm, and the position of the bare grating is in the center of the test piece.
The method for testing the bonding performance of the interface comprises the steps of coring the interface perpendicular to a repairing interface, wherein the diameter of a core sample is 50mm, the core sample comprises the old concrete core sample with the length of 50mm, the length of a repairing material core sample is 50mm, bonding drawing blocks are bonded at two ends of the core sample, placing a tensile test sample on a tensile machine, recording the damage load, obtaining the bonding strength of the interface according to the ratio of the damage load to the bonding area of the repairing interface, recording the failure mode according to the damaged test piece, and if the failure position occurs at the repairing interface, obtaining the interface failure, and if the failure position occurs at the base body, obtaining the base body failure.
TABLE 1 repair Material Performance analysis
Compared with the common concrete repair material of the control group 1, the interface bonding strength of the concrete repair material of the example 1 and the common concrete repair material of the example 2 are improved by 94%, the failure modes are obviously different, the slurry-bone ratio is similar, and the elastic modulus is improved by 75% -78%; the compressive strength of the material is 240% -250%, and the manufacturing cost is improved by 62% -80%. The conventional ultra-high performance concrete of example 1 and example 2 has similar interfacial bond strength and the same failure mode compared with that of comparative example 2, but the slurry-bone ratio of comparative example 2 is about 4 times that of examples 1 and 2, the manufacturing cost is more than 3 times that of examples 1 and 2, and the shrinkage is more than 2 times that of the invention. Compared with the traditional repairing material, the invention has the characteristics of high interface bonding performance and low bone ratio.
And (2) result analysis II:
in order to analyze the difference of repair materials of an embodiment and a control group, a sample is cored at a repair interface, polishing and grinding are carried out, a back scattering mode is carried out to observe the structural characteristics of a plane, the slurry bone ratio of the embodiment 1 and the embodiment 2 is similar to that of the control group 1, the density difference of an interface transition area is larger, the embodiment 1 and the embodiment 2 are compact, but the interface of the control group 1 is defective, the defect is caused because the conventional concrete contains coarse aggregate, after the conventional concrete is poured on the repair surface, the slurry of a mixture is prevented from entering at a concave position of the repair surface, and the slurry shortage phenomenon occurs. Under the condition of obtaining an interface compact structure similar to that of the traditional ultra-high performance concrete, the invention greatly reduces the shrinkage and the manufacturing cost of the repairing material, thereby bringing remarkable benefits to large-area paving and decoration of engineering, reducing the cracking risk of the repairing material and reducing the manufacturing cost of the material.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The preparation and repair method of the repair material with high interface bonding performance and low bone size ratio is characterized by comprising the following steps:
carrying out surface treatment on the concrete to be repaired until the surface of the concrete is rough;
casting a first layer of repair material on the repair surface perpendicular to the repair surface support template, wherein the thickness of the first layer of repair material is 1-4 cm;
putting crushed stone with the grain size of 5-10mm into the first layer of repairing material, and pressing the crushed stone into the slurry until the crushed stone is pressed to the repairing surface to form a first layer of repairing material layer;
putting crushed stone with the grain diameter of 5-20mm on the upper part of the first repairing material layer, putting and stacking the crushed stone in layers, wherein the stacking thickness of each layer is 10-20cm, burying grouting pipes in each layer, wherein the grouting pipes are S-shaped distributed calandria, grouting a second repairing material layer from bottom to top, and curing after the slurry and the put crushed stone are fully combined;
the first layer of repairing material consists of the following raw materials in parts by weight: 350-600 parts of cement, 22-60 parts of silica fume, 110-160 parts of water, 8-12 parts of water reducer and 0-350 parts of sand;
the weight ratio of the crushed stone with the particle size of 5-10mm to the cement is 130-180:35-60;
the second layer of repairing material consists of the following raw materials in parts by weight: 300-600 parts of cement, 3-6 parts of nano material, 120-160 parts of water, 10-25 parts of water reducer and 0-350 parts of sand;
the weight ratio of the broken stone with the grain diameter of 5-20mm to the cement is 100-260:30-60;
along with 5-20mm broken stone throwing, steel fibers are uniformly thrown in, and the throwing amount is 1-3% of the volume doping amount.
2. The method for preparing and repairing a high interfacial adhesion and low bone ratio repairing material according to claim 1, wherein said cement is Portland cement.
3. The method for preparing and repairing a high interfacial adhesion and low bone ratio repairing material according to claim 1, wherein the sand is one or more of river sand and machine-made sand, and the grain size is not more than 5mm.
4. The method for preparing and repairing the high interfacial adhesion and low bone ratio repairing material according to claim 1, wherein the nano material is nano SiO 2 Or nano TiO 2 。
5. The method for preparing and repairing the high-interface bonding performance and low-slurry bone ratio repairing material according to claim 1, wherein the surface roughness of the concrete is evaluated by adopting a sand filling method, and the average sand filling depth is 5mm-1.5cm.
6. The method for preparing and repairing the repair material with high interfacial adhesion and low bone ratio according to claim 1, wherein the grouting pipe is made of a steel pipe with 1-2mm, holes are punched at equal intervals of 20cm-40cm, and S-shaped distributed calandria is formed.
7. A high interfacial adhesion and low bone ratio repair material made by the method of any one of claims 1-6.
8. Use of the repair material of claim 7 for repairing a damaged concrete structure.
Priority Applications (1)
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