CN210104955U - Repair liquid bearing system of self-repairing concrete and self-repairing concrete prefabricated member - Google Patents
Repair liquid bearing system of self-repairing concrete and self-repairing concrete prefabricated member Download PDFInfo
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Abstract
The utility model provides a repair liquid bearing system of selfreparing concrete and based on the selfreparing concrete prefab of repair liquid bearing system. The repair liquid bearing system comprises hollow pipes with an inner layer and an outer layer; the inner layer is a porous layer, the material is metal with deformability, and through holes are uniformly distributed on the surface of the inner layer; the outer layer is a compact layer, is made of water-soluble polymer and has the thickness of 1-4 mm; the inner layer is used for loading concrete repair liquid; the through hole is used for conveying repair liquid outwards; the outer layer is used for isolating the repairing liquid from the concrete during concrete pouring and is decomposed completely along with the loss of moisture in the concrete curing process. The utility model discloses a repair liquid bearing system can solve current selfreparing concrete repair liquid and bear the weight of the easy scheduling problem that breaks when the container vibrates to realize the many times selfreparing of selfreparing concrete.
Description
Technical Field
The utility model relates to a novel reinforced concrete structure is with double-deck pipe selfreparing system can realize the selfreparing many times to the concrete, belongs to the building structure field.
Background
In order to make up for the disadvantage of low tensile strength of concrete, reinforcing steel bars are usually arranged in the structure, and due to the alkaline environment in the concrete, a protective film is formed on the surface of the reinforcing steel bars to protect the reinforcing steel bars from being corroded. However, concrete is prone to crack when being pulled, harmful substances such as chloride ions, oxygen, carbon dioxide and the like enter the concrete after the concrete cracks, and after the substances gradually penetrate into contact with the steel bars, the steel bar protective layer is damaged so that the steel bars are corroded and expanded, and the surrounding concrete is further cracked and peeled off, so that the safety and durability of the concrete structure are endangered.
Deterioration of concrete occurs frequently and is difficult to predict and monitor, and detection of concrete damage is labor intensive. The internal damage that normally occurs to concrete is not visible and the deterioration of concrete structures, especially in aggressive environments, is a self-accelerating process and very fast, for example in environments with high concentrations of chlorides and sulphates, the durability of which is greatly reduced, and which is not normally easily detectable until severe cracking and corrosion of the structure occurs and which is subsequently repaired. However, the quality of concrete repair is not satisfactory, and nearly half of concrete repairs end up failing and require re-repair and reinforcement.
Over the past two decades, self-repairing concrete technology has been considered as a more effective solution to the problem of concrete repair. The self-repairing concrete can improve the safety and the durability of the concrete structure, and the technology has important significance in prolonging the service life of the concrete structure and reducing the maintenance frequency and the cost. The self-repairing concrete not only reduces energy consumption generated by production and transportation of building materials and reduces generation of building wastes, but also is beneficial to solving social problems such as traffic change and blockage caused by maintenance and reconstruction of infrastructure. Self-healing concrete is therefore a promising technology to achieve an excellent durable, sustainable and low life cycle cost concrete infrastructure.
The concrete has the capability of self-repairing cracks. The self-repairing phenomenon of concrete is directly observed in broken water pipes for the first time in 1937. Subsequent studies have also demonstrated the inherent self-healing properties of concrete. This inherent self-healing is due to unhydrated cement particles and calcium carbonate precipitation caused by the reaction of calcium hydroxide with carbon dioxide. Qian and Zhou studied the inherent self-healing properties of concrete in different environments, revealing that the inherent self-healing properties of concrete are limited to environmental conditions, requiring the presence of water and carbon dioxide. Generally, the efficiency of self-healing inherent in concrete is low, and the maximum crack width that can be cured is limited to within a few tenths of a millimeter.
To achieve effective self-repair of concrete, many researchers have introduced different chemical liquids and bacterial solutions into self-repairing concrete systems as repair liquids. The repairing liquid is stored in a tubular carrier or encapsulated in a capsule, the tubular carrier is embedded in the concrete, and the capsule is mixed with the concrete. When the concrete cracks, the pipe/capsule carrying the repair liquid breaks, allowing the repair agent to enter the crack to repair the crack. Although many studies have demonstrated that these self-healing concrete systems are effective under certain laboratory conditions, the pipes and capsules have limitations and are sometimes not applicable in engineering practice. The pipeline capsule carrying the repair liquid is made of fragile materials such as glass, ceramics and the like so as to ensure that the pipeline capsule can be broken in time after concrete cracks, and therefore the pipeline capsule and the pipeline capsule are easy to break in advance and lose the self-repair function when concrete is mixed and poured. Due to capacity limitations, a self-repairing concrete system with capsules as the repair liquid carrying containers may not be able to repair large cracks, whereas the self-repairing process in a self-repairing concrete system with tubular carriers as the repair liquid containers is not repeatable because the internal repair liquid is completely lost once it is broken. Along with the increase of the volume of the repair liquid container, the strength of the matrix is weakened to a certain extent, and the bearing capacity of the structure is reduced. Self-healing concrete technology is therefore rarely applied in engineering practice.
SUMMERY OF THE UTILITY MODEL
In view of the above, an object of the utility model is to provide a reinforced concrete structure is with double-deck pipe selfreparing system to solve current selfreparing concrete repair liquid and bear the weight of easy fracture scheduling problem when the container vibrates, and realize the many times selfreparing of selfreparing concrete.
The utility model provides a technical scheme that above-mentioned problem adopted is:
the double-layer tubular repair liquid bearing system for the self-repairing concrete is provided, and comprises a hollow tube with an inner layer and an outer layer; the inner layer is a porous layer, the material is metal with deformability, and through holes are uniformly distributed on the surface of the inner layer; the outer layer is a compact layer, is made of water-soluble polymer and has the thickness of 1-4 mm; the inner layer is used for loading concrete repair liquid; the through hole is used for conveying repair liquid outwards; the outer layer is used for isolating the repairing liquid from the concrete during concrete pouring and is decomposed completely along with the loss of moisture in the concrete curing process.
In the preferred scheme of the utility model, the metal with stronger deformability can be selected from steel, stainless steel, galvanized steel or aluminum alloy; most preferably steel.
In the preferred embodiment of the present invention, the water-soluble polymer may be selected from polyvinyl alcohol, polyacrylic acid, urea formaldehyde resin or melamine formaldehyde resin.
The polyvinyl alcohol is more preferably a polyvinyl alcohol having a molecular weight of 150000-200000.
The polyacrylic acid is more preferably polyacrylic acid having a molecular weight of 3000-4000.
The urea resin is further preferably urea resin having a molecular weight of 10000.
The melamine formaldehyde resin is further preferably a melamine formaldehyde resin having a molecular weight of 200-500.
In the most preferable scheme of the utility model, the outer layer is a polyvinyl alcohol film with the molecular weight of 180000-200000, the alcoholysis degree of 88-99% and the thickness of 1.5-3 mm; the membrane is able, on the one hand, to resist the penetration of concrete into the inner tube during the concrete casting and, on the other hand, to decompose over the period of curing of the existing conventional concrete materials.
In the scheme of the utility model, the specific form of the through holes is not limited, and the through holes can be circular through holes, square through holes, flat rectangular through holes or through holes with any irregular shape which are distributed on the inner layer at intervals, and can also be spiral through holes spirally extending around the axial direction of the hollow pipe; the distribution range of the through holes on the inner layer is generally smaller than or equal to the contact area of the hollow pipe and the concrete, and the preferred distribution range is matched with the contact area.
In the preferred embodiment of the present invention, the outer layer is obtained by spraying or coating the water-soluble polymer solution on the outer surface of the inner layer to form a liquid film.
In the preferred scheme of the utility model, outer surface be equipped with the screw thread to the reinforcing with the bonding ability who uses the substrate.
On this basis, the utility model further provides a reinforced concrete prefab with from repairing function, it by concrete package reinforcing bar with repair liquid bearing system constitute.
The utility model discloses in the preferred reinforced concrete prefab, the reinforcing bar distribute be in the inlayer of prefab, repair liquid bear the weight of the system distribute in between reinforcing bar and the prefab surface.
The utility model discloses in the preferred reinforced concrete prefab, repair liquid bearing system both ends salient in outside the prefab to further set up repair liquid and fill the mouth, be used for receiving at any time and come from outside repair liquid.
The utility model discloses an in the scheme, repair liquid play the effect of filling the crack, recovering bonding at the selfreparing in-process, consequently repair liquid should have following characteristic: high strength, rapid setting, simple curing conditions, good fluidity, low cost and long life. Therefore, the utility model selects organic resin as the repair liquid in the preferred proposal; further preferably, cyanoacrylate repair liquid or repair liquid mixed by ethyl acetate and polyurethane; most preferably, the cyanoacrylate repair liquid has the characteristics of medium viscosity, high strength, room-temperature curing and the like; polyurethane (PU) has the same characteristics as above, but its viscosity is slightly higher, so it can be diluted with ethyl acetate, and the mass ratio is preferably 5: 1.
Double-deck tubulose restoration liquid bearing system in, in order to satisfy simultaneously the skin completely cuts off restoration liquid and concrete when concrete placement, attenuation is enough to be along with the cracked demand of concrete in the cycle of concrete curing, the utility model discloses the people is right outer thickness has carried out a large amount of experiments and research with the composition. In the ideal scheme finally obtained, the outer layer material is a water-soluble polymer, and has 86% -90% alcoholysis degree and 1-4mm thickness; the component should be any one of polyvinyl alcohol, polyacrylic acid, urea resin or melamine formaldehyde resin. More preferably, the outer layer is a PVA film with a thickness of 1.5-3mm and a molecular weight of 180000-. It is verified through the experiment that this outer membrane can satisfy above-mentioned demand effectively, not only can resist the power of applying on the body in the concrete forming process that vibrates, keep the film complete, effectively isolated repair liquid and concrete, can meet water in the concrete curing process moreover and dissolve the attenuation or decompose totally, guarantee from this that the outer membrane can break thereupon after the concrete member crack appears for repair liquid gets into the crack from the inlayer, realizes the selfreparing.
Double-deck tubulose restoration liquid bearing system lead to long arranging in the concrete sample, a external connection restoration liquid storage container, restoration liquid can add at any time to reach prosthetic purpose many times.
The utility model discloses easily arrange in concrete structure, its arrangement method is similar with the arrangement method of reinforcing bar in this selfreparing concrete system utility model. After the concrete pouring is completed, the repair liquid is injected into the double-layer pipe structure through an external storage container to be completely filled, and the system is kept in an inactive state before the member is cracked. Once the concrete ftractures, the outer PVA film that dissolves totally can be destroyed along with the production of crack, and the restoration liquid flows out and fills the crack, treats that it can provide certain intensity after the solidification and makes the crack seal the protection reinforcing bar and not corroded, realizes the recovery of structural strength and the improvement of durability.
Compared with the prior art, the utility model discloses following beneficial effect has:
1. the utility model discloses a repair liquid bears system can solve when pouring the problem of in time releasing repair liquid when protecting repair liquid and fracture all the time simultaneously.
2. The repair liquid bearing system of the utility model can be used for most concrete members, such as beams, plates and columns, and the pipeline network can be easily placed in the place where the reinforcing steel bars are arranged without special equipment or labor training;
3. the self-repairing concrete prefabricated member does not cause any difficulty or problem in the concrete stirring and pouring process, so that the quality and the performance of the concrete are not negatively influenced;
4. due to the additional supply of the reusable repairing agent stored outside, larger cracks can be repaired, multiple self-repairing is realized, and the service life of a self-repairing system is prolonged;
5. the usage rate of the repair liquid can be used as a 'health index' for monitoring the fracture rate and the healing process of the concrete, so that effective data can be provided for the damage monitoring of the component.
Drawings
FIG. 1 is a schematic cross-sectional view of a repair liquid carrier system according to example 1 or 2;
FIG. 2 is a schematic side view of a repair liquid carrier system according to example 1;
FIG. 3 is a schematic side view of a repair liquid carrier system according to example 2;
FIG. 4 is a schematic cross-sectional view of a repair liquid carrier system according to example 3;
FIG. 5 is a schematic side view of a repair liquid carrier system according to example 3;
FIG. 6 is a schematic representation of the construction of the self-healing concrete preform of example 4;
in the figure, 1, a concrete matrix, 2, a steel bar, 3, an external repair liquid storage container, 4, a double-layer self-repair pipe, 5, a crack, 6, repair liquid, 7, an inner-layer pipe, 8, an outer-layer pipe and 9, a repair liquid channel (through hole) are arranged.
Detailed Description
The utility model discloses based on reinforced concrete structure is with double-deck pipe selfreparing system, inlayer pipe material is steel, and the pipe wall is reserved has along length direction distribution's reservation pore (9), and the width is 1 mm. Outer layer pipe material is for meeting water soluble PVA polymer, meets water dissolution thickness after the concrete fracture and reduces. After the matrix cracks, the cracks (5) extend to the outer-layer tube, the outer-layer tube (8) is dissolved in water to reduce thickness and is broken after being stressed, the inner-layer tube (7) is communicated with the cracks, the internal repair liquid (6) flows into the cracks along the reserved hole channels of the inner-layer tube wall, the cracks are filled and cured, and the repairing effect on the cracks is achieved.
Example 1:
a repair liquid bearing system for reinforced concrete is shown in a cross section of figure 1 and comprises an inner layer pipe 7 and an outer layer pipe 8, wherein the outer diameter of the outer layer pipe 8 is 20mm, and the wall thickness is 2 mm; the outer diameter of the inner-layer pipe 7 is 16mm, the wall thickness is 4mm, the inner-layer pipe 7 is a repair liquid flowing channel, and the outer-layer pipe 8 protects the inner-layer pipe 7 during concrete pouring. Wherein, the inner layer tube 7 is provided with a flat rectangular repair liquid channel (through hole) 9. The repair liquid 6 is stored in the inner tube 7.
Preparation of double-layer tube structure
Preparing an inner layer pipe:
the inner tube 7 has a wall made of steel material and an outer diameter of 16mm, and has a side structure as shown in fig. 2, and flat and rectangular repair liquid passages (through holes) 9 distributed along the length are reserved on the wall of the inner tube 7, and the distribution range of the repair liquid passages is matched with the length of the test piece.
Preparing an outer layer tube:
the material of the outer layer pipe 8 is water-soluble polyvinyl alcohol (PVA), the molecular weight of which is 180000-200000, and the outer layer pipe can be dissolved in water environment so as to reduce the thickness. The outer diameter is 20mm, the wall thickness is about 2mm, the length is the same as that of the inner layer pipe 7, and the outer wall is in a thread shape so as to increase the bonding performance between the outer wall and the base body. Firstly, preparing 1% PVA solution, wherein the alcoholysis degree of the PVA solution is about 86-90%, and because the PVA solution has viscosity, atomizing and spraying the PVA solution on an inner-layer pipe to form a layer of PVA solution film; in order to increase the bonding performance between the substrates, a layer of PVA solution film is coated on the PVA film along the spiral shape to be made into a thread shape. The preparation of the double-layer tube structure is completed by the method.
The repair liquid supply system provides sufficient repair liquid for the double-layer pipe self-repair system for the reinforced concrete structure, the external repair liquid storage container is arranged outside the test piece, can be made of common plastics and is communicated with the double-layer pipe extending out of the test piece, and the repair liquid supply system can be supplemented in time when the repair liquid is insufficient, so that repeated self-repair can be realized.
Example 2
A repair liquid bearing system for reinforced concrete is shown in a cross section of figure 1 and comprises an inner layer pipe 7 and an outer layer pipe 8, wherein the outer diameter of the outer layer pipe 8 is 20mm, and the wall thickness is 3 mm; the outer diameter of the inner layer pipe 7 is 16mm, the wall thickness is 4mm, the inner layer pipe 7 is a repair liquid flowing channel, and the outer layer pipe 8 protects the inner layer pipe during concrete pouring. Wherein the inner layer tube 7 is provided with a circular repair liquid channel (through hole) 9. The repair liquid 6 is stored in the inner tube 7.
Preparation of double-layer tube structure
Preparing an inner layer pipe:
the inner tube 7 is made of steel, the outer diameter of the inner tube is 16mm, the side structure of the inner tube is shown in fig. 3, circular repair liquid channels (through holes) 9 distributed at intervals are reserved on the tube wall of the inner tube 7, and the distribution range of the repair liquid channels is matched with the length of a test piece.
Preparing an outer layer tube:
the material of the outer layer pipe 8 is water-soluble polyvinyl alcohol (PVA), the molecular weight of which is 180000-200000, and the outer layer pipe can be dissolved in water environment so as to reduce the thickness. The outer diameter of the pipe is 20mm, the wall thickness is about 3mm, the length of the pipe is the same as that of the inner-layer pipe 7, and the outer wall of the pipe is in a threaded shape so as to improve the bonding performance between the pipe and a base body. Firstly, preparing 1% PVA solution, wherein the alcoholysis degree of the PVA solution is about 86-90%, and because the PVA solution has viscosity, atomizing and spraying the PVA solution on an inner-layer pipe to form a layer of PVA solution film; in order to increase the bonding performance between the substrates, a layer of PVA solution film is coated on the PVA film along the spiral shape to be made into a thread shape. The preparation of the double-layer tube structure is completed by the method.
The repair liquid supply system provides sufficient repair liquid for the double-layer pipe self-repair system for the reinforced concrete structure, the external repair liquid storage container is arranged outside the test piece, can be made of common plastics and is communicated with the double-layer pipe extending out of the test piece, and the repair liquid supply system can be supplemented in time when the repair liquid is insufficient, so that repeated self-repair can be realized.
Example 3:
a repair liquid bearing system for reinforced concrete is shown in figure 4, the cross section structure of the system is composed of an inner layer pipe 7 and an outer layer pipe 8, the outer diameter of the outer layer pipe 8 is 20mm, and the wall thickness is 1.5 mm; the outer diameter of the inner-layer pipe 7 is 17mm, the wall thickness is 4mm, the inner-layer pipe 7 is a repair liquid flowing channel, and the outer-layer pipe 8 protects the inner-layer pipe during concrete pouring. Wherein the inner layer tube 7 is provided with a spiral repair liquid channel (through hole) 9. The repair liquid 6 is stored in the inner tube 7.
Preparation of double-layer tube structure
Preparing an inner layer pipe:
the inner layer tube (7) wall material is steel, its external diameter is 17mm, its side structure is as shown in figure 5, the tube wall of the inner layer tube 7 reserves the spiral through hole type repair liquid channel (through hole) 9 distributed along the length, its length matches with the length of the test piece.
Preparing an outer layer tube:
the material of the outer layer pipe 8 is water-soluble polyvinyl alcohol (PVA), the molecular weight of which is 180000-200000, and the outer layer pipe can be dissolved in water environment so as to reduce the thickness. The outer diameter of the pipe is 20mm, the wall thickness is about 1.5mm, the length of the pipe is the same as that of the inner-layer pipe 7, and the outer wall of the pipe is in a threaded shape so as to increase the bonding performance between the pipe and a base body. Firstly, preparing 1% PVA solution, wherein the alcoholysis degree of the PVA solution is about 86-90%, and because the PVA solution has viscosity, atomizing and spraying the PVA solution on an inner-layer pipe to form a layer of PVA solution film; in order to increase the bonding performance between the substrates, a layer of PVA solution film is coated on the PVA film along the spiral shape to be made into a thread shape. The preparation of the double-layer tube structure is completed by the method.
The repair liquid supply system provides sufficient repair liquid for the double-layer pipe self-repair system for the reinforced concrete structure, the external repair liquid storage container is arranged outside the test piece, can be made of common plastics and is communicated with the double-layer pipe extending out of the test piece, and the repair liquid supply system can be supplemented in time when the repair liquid is insufficient, so that repeated self-repair can be realized.
Example 4: double-layer pipe self-repairing system for reinforced concrete structure
A self-repairing reinforced concrete prefabricated member, which is a reinforced concrete structure manufactured based on the double-layer pipe self-repairing system of the embodiment 1, 2 or 3, wherein a through long pipe structure is embedded in reinforced concrete.
As shown in fig. 6, the prefabricated member includes a concrete base 1, a steel bar 2 embedded in the concrete base, a double-layer tube structure repair liquid bearing container 4 embedded at the lower part of the steel bar, and an external repair liquid storage container 3, the double-layer tube structure is composed of an outer layer tube 8 and an inner layer tube 7, wherein the outer layer tube is made of soluble PVA, the inner layer tube is made of steel, and repair liquid channels 9 are distributed on the wall of the inner layer tube. The CA repairing liquid 6 is stored in the inner layer pipe, when the reinforced concrete member cracks to generate cracks 5, the outer layer pipe wall of the double-layer pipe structure is dissolved and cracked, the repairing liquid 6 flows into the cracks from the inner layer pipe along the repairing liquid channel, and after the repairing liquid is cured, the cracks are bonded and sealed with certain strength, the mechanical property is recovered, the durability is improved, and the self-repairing purpose is achieved.
The purpose, technical solution and advantages of the present invention are explained in detail in this example. It should be understood that the above-mentioned embodiments are only preferred embodiments of the present invention, and should not be construed as limiting the present invention, and any modifications, equivalent replacements, improvements, etc. made within the technical scope of the present invention should be included in the protection scope of the present invention.
Claims (14)
1. The utility model provides a repair liquid bearing system of selfreparing concrete which characterized in that: it is a hollow tube comprising an inner layer and an outer layer; the inner layer is a porous layer, the material is metal with deformability, and through holes are uniformly distributed on the surface of the inner layer; the outer layer is a compact layer, is made of water-soluble polymer and has the thickness of 1-4 mm; the inner layer is used for loading concrete repair liquid; the through hole is used for conveying repair liquid outwards; the outer layer is used for isolating the repairing liquid from the concrete during concrete pouring and is decomposed completely along with the loss of moisture in the concrete curing process.
2. The repair liquid carrier system according to claim 1, wherein: the metal with stronger deformability is selected from steel, stainless steel, galvanized steel or aluminum alloy.
3. The repair liquid carrier system according to claim 1, wherein: the metal with stronger deformability is steel.
4. The repair liquid carrier system according to claim 1, wherein: the water-soluble polymer is selected from any one of polyvinyl alcohol, polyacrylic acid, urea-formaldehyde resin or melamine-formaldehyde resin.
5. The repair liquid carrier system according to claim 4, wherein: the polyvinyl alcohol has a molecular weight of 150000-200000; the polyacrylic acid has a molecular weight of 3000-4000; the urea-formaldehyde resin is urea-formaldehyde resin with the molecular weight of 10000; the melamine formaldehyde resin is melamine formaldehyde resin with the molecular weight of 200-500.
6. The repair liquid carrier system according to claim 1, wherein: the outer layer is a polyvinyl alcohol film with the molecular weight of 180000-200000, the alcoholysis degree of 88-99% and the thickness of 1.5-3 mm.
7. The repair liquid carrier system according to claim 1, wherein: the through holes are round through holes, square through holes or flat rectangular through holes which are distributed on the inner layer at intervals.
8. The repair liquid carrier system according to claim 1, wherein: the outer surface of the outer layer is provided with threads.
9. A self-repairing concrete precast member, which is characterized by comprising concrete wrapping steel bars and the repair liquid bearing system of claim 1.
10. A concrete preform as claimed in claim 9, wherein: the reinforcing steel bars are distributed on the innermost layer of the prefabricated member, and the repair liquid bearing system is distributed between the reinforcing steel bars and the surface of the prefabricated member.
11. A concrete preform as claimed in claim 9, wherein: the two ends of the repair liquid bearing system protrude out of the prefabricated member, and a repair liquid filling opening is further arranged and used for receiving repair liquid from the outside at any time.
12. A concrete preform as claimed in claim 9, wherein: the repair liquid is organic resin repair liquid.
13. A concrete preform as claimed in claim 9, wherein: the repairing liquid is cyanoacrylate repairing liquid or ethyl acetate and polyurethane mixed repairing liquid.
14. A concrete preform as claimed in claim 9, wherein: the repair liquid is cyanoacrylate repair liquid or repair liquid prepared by mixing polyurethane and ethyl acetate according to the weight ratio of 5: 1.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109811879A (en) * | 2019-03-22 | 2019-05-28 | 河北工业大学 | Double layered tubular for self-repair concrete repairs liquid bearing system |
| CN115302621A (en) * | 2022-08-03 | 2022-11-08 | 南通理工学院 | Preparation method for improving mechanical property and durability of concrete material |
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2019
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109811879A (en) * | 2019-03-22 | 2019-05-28 | 河北工业大学 | Double layered tubular for self-repair concrete repairs liquid bearing system |
| CN109811879B (en) * | 2019-03-22 | 2023-11-07 | 河北工业大学 | Double-layer tubular repair liquid bearing system for self-repairing concrete |
| CN115302621A (en) * | 2022-08-03 | 2022-11-08 | 南通理工学院 | Preparation method for improving mechanical property and durability of concrete material |
| CN115302621B (en) * | 2022-08-03 | 2023-06-09 | 南通理工学院 | Preparation method for improving mechanical property and durability of concrete material |
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