CN112878585A - High-explosion-resistance high-strength foamed aluminum-steel tube concrete composite column and preparation method thereof - Google Patents
High-explosion-resistance high-strength foamed aluminum-steel tube concrete composite column and preparation method thereof Download PDFInfo
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/30—Columns; Pillars; Struts
- E04C3/36—Columns; Pillars; Struts of materials not covered by groups E04C3/32 or E04C3/34; of a combination of two or more materials
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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
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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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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Abstract
The invention provides a high-explosion-resistance high-strength foamed aluminum-steel tube concrete composite column and a preparation method thereof, belonging to the field of structural protection engineering and comprising concrete, a steel tube, foamed aluminum, an epoxy resin adhesive and a stainless steel outer protective layer which are sequentially arranged from inside to outside; the outer wall of the steel pipe is provided with a plurality of supporting nails; the steel pipe and the foamed aluminum are fixedly connected through a supporting nail; and the foamed aluminum and the stainless steel outer protective layer are bonded through an epoxy resin adhesive. The high-explosion-resistance high-strength foamed aluminum-steel tube concrete composite column and the steel tube concrete column are tested under the explosive impact load of 25kgTNT explosive equivalent, the midspan displacement of the steel tube concrete column is 62.5mm, the midspan displacement of the high-explosion-resistance high-strength foamed aluminum-steel tube concrete composite column is only 22.7-38.75 mm, the concrete cracks are few, and the high-explosion-resistance high-strength foamed aluminum-steel tube concrete composite column is high in strength and strong in explosion resistance.
Description
Technical Field
The invention belongs to the field of structural protection engineering, and particularly relates to a high-explosion-resistance high-strength foamed aluminum-steel tube concrete composite column and a preparation method thereof.
Background
At present, methods for improving the anti-explosion capacity of a steel tube concrete column include improving the strength grade of concrete materials, increasing the section area of the column, externally attaching FRP (fiber reinforced plastic), doping high-strength fiber materials in concrete and the like, but the measures are still limited in the aspect of improving the strength and the anti-explosion capacity of the steel tube concrete column, and once the steel tube concrete column has problems in explosion, reconstruction and large cost investment are faced. Therefore, it is necessary to improve the strength grade of concrete and optimize the steel pipe concrete column, for example, to arrange an outer protective layer on the periphery of the steel pipe concrete column, so that the outer protective layer-steel pipe concrete column composite structure has higher strength and excellent anti-explosion performance, and the reconstruction cost can be reduced.
Disclosure of Invention
The invention aims to provide a high-explosion-resistance high-strength foamed aluminum-steel tube concrete composite column and a preparation method thereof. The high-explosion-resistance high-strength foamed aluminum-steel tube concrete composite column provided by the invention has higher strength, can absorb and consume most of the energy of explosion shock waves, effectively reduces the damage of the explosion shock waves to the inner steel tube concrete column, improves the deformation resistance of the steel tube concrete column, and further reduces the probability of damage and even collapse of a building; and if only the damage of the external protective layer is serious, and the damage of the internal concrete-filled steel tubular column is not large, the damaged external protective layer can be integrally disassembled and replaced without building a new building, so that the investment amount can be saved, the construction period can be shortened, and the waste of natural resources and social resources can be avoided.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a high-explosion-resistance high-strength foamed aluminum-steel tube concrete composite column, which comprises concrete, a steel tube, foamed aluminum, an epoxy resin adhesive and a stainless steel outer protective layer which are sequentially arranged from inside to outside;
the outer wall of the steel pipe is provided with a plurality of supporting nails; the steel pipe and the foamed aluminum are fixedly connected through a supporting nail;
and the foamed aluminum and the stainless steel outer protective layer are bonded through an epoxy resin adhesive.
Preferably, the concrete comprises the following components in parts by weight: 294.88-370.14 parts of cement, 68.05-85.42 parts of fly ash, 90.73-113.89 parts of granulated blast furnace slag powder, 864-945 parts of crushed stone, 740.68-774.86 parts of sand, 45.37-56.95 parts of an expanding agent, 6.80-8.54 parts of a water reducing agent and 116.95-145.38 parts of water.
Preferably, the cross-sectional shape of the steel pipe includes a circle or a polygon.
Preferably, the steel pipe is made of a material including Q235, Q345 or Q390.
Preferably, the thickness of the steel pipe is more than or equal to 3 mm.
Preferably, the longitudinal distance of the support nails along the length direction of the steel pipe is 300-500 mm; the ratio of the number of rows of the supporting nails to the circumference of the outer wall of the steel pipe is 1:78 to 160.
Preferably, the foamed aluminum is aramid fiber reinforced foamed aluminum.
Preferably, the thickness of the foamed aluminum is 2-5 times of that of the steel pipe.
Preferably, the thickness of the stainless steel outer protection layer is 10-50% of the thickness of the steel pipe.
The invention also provides a preparation method of the high antiknock high-strength foamed aluminum-steel tube concrete composite column, which comprises the following steps:
(1) welding a support nail on the outer wall of the steel pipe to obtain the steel pipe welded with the support nail;
(2) pouring concrete into the steel tube welded with the support nail obtained in the step (1) to obtain a steel tube concrete column;
(3) adhering foamed aluminum to the inner surface of the stainless steel outer protective layer by using an epoxy resin adhesive to obtain a composite outer protective layer;
(4) welding the supporting nails on the outer wall of the steel pipe concrete column obtained in the step (2) with the foamed aluminum of the composite outer protective layer obtained in the step (3), and then butt-welding the stainless steel outer protective layers to obtain the high-antiknock high-strength foamed aluminum-steel pipe concrete composite column;
the steps (1) and (3) are not in sequence.
The invention provides a high-explosion-resistance high-strength foamed aluminum-steel tube concrete composite column and a preparation method thereof, wherein the high-explosion-resistance high-strength foamed aluminum-steel tube concrete composite column comprises concrete, a steel tube, foamed aluminum, an epoxy resin adhesive and a stainless steel outer protective layer which are sequentially arranged from inside to outside; the outer wall of the steel pipe is provided with a plurality of supporting nails; the steel pipe and the foamed aluminum are fixedly connected through a supporting nail; and the foamed aluminum and the stainless steel outer protective layer are bonded through an epoxy resin adhesive. According to the invention, the foamed aluminum and the outer protective sleeve are tightly bonded by using the epoxy resin adhesive, so that the foamed aluminum and the outer protective sleeve are used as parts for mainly absorbing and consuming most of the energy of the explosion shock wave, the damage of the explosion shock wave to the inner steel tube concrete column can be reduced, and the probability of damage and even collapse of a building is reduced; meanwhile, a plurality of supporting nails are arranged on the outer wall of the steel pipe and are used for fixing the foamed aluminum and the stainless steel outer protective layer, so that the steel pipe, the foamed aluminum and the outer protective sleeve can form a tightly connected whole, the vertical bearing capacity and the buckling deformation resistance capacity of the whole steel pipe concrete column are improved, the whole composite column has higher strength, and the composite column cannot generate obvious midspan displacement when being subjected to explosion impact; in addition, if only the outer layer of the steel pipe concrete column is seriously damaged and the inner steel pipe concrete column is not greatly damaged, the damaged outer layer can be integrally disassembled and replaced without building reconstruction, so that the investment amount can be saved, the construction period can be shortened, and the waste of natural resources and social resources can be avoided.
The results of the examples show that the concrete obtained in the examples of the invention is tested according to GB/50081-2019 'test method Standard for physical and mechanical Properties of concrete', the compressive strength at 7d is 25.13-35.53 MPa, the compressive strength at 14d is 38.58-56.64 MPa, and the compressive strength at 28d is 48.23-69.12 MPa; the 28d flexural strength is 4.38-6.28 MPa. In addition, in the invention, the steel pipe concrete column without the foamed aluminum and the stainless steel outer protective layer in the comparative example 1 and the high-explosion-resistance high-strength foamed aluminum-steel pipe concrete composite column obtained in the examples 1 to 5 are tested under the same explosion impact load (25kgTNT explosive equivalent), the midspan displacement of the steel pipe concrete column in the comparative example 1 reaches 62.5mm, while the midspan displacement of the high-explosion-resistance high-strength foamed aluminum-steel pipe concrete composite column in the examples 1 to 5 is only 22.7 to 38.75mm, which is far lower than that of the steel pipe concrete column without the foamed aluminum and the stainless steel outer protective layer in the comparative example 1, and the internal concrete cracks are few. Therefore, the high-explosion-resistance high-strength foamed aluminum-steel tube concrete composite column has high strength and excellent explosion-resistance capability.
Drawings
FIG. 1 is a schematic diagram of the components of a high-explosion-resistance high-strength foamed aluminum-steel tube concrete composite column manufactured in example 1 of the present invention; wherein, 1 is concrete, 2 is a steel pipe, 3 is high-strength foamed aluminum, 4 is an epoxy resin adhesive, 5 is an outer protective sleeve, and 7 is a welding seam;
FIG. 2 is a schematic cross-sectional view of a high-anti-explosion high-strength foamed aluminum-steel tube concrete composite column manufactured in example 1 of the present invention; wherein, 1 is concrete, 2 is the steel pipe, 3 is high strength foamed aluminium, 4 is the epoxy adhesive, 5 is outer protective sleeve, 6 is the support nail, 7 is the welding seam.
Detailed Description
The invention provides a high-explosion-resistance high-strength foamed aluminum-steel tube concrete composite column, which comprises concrete, a steel tube, foamed aluminum, an epoxy resin adhesive and a stainless steel outer protective layer which are sequentially arranged from inside to outside;
the outer wall of the steel pipe is provided with a plurality of supporting nails; the steel pipe and the foamed aluminum are fixedly connected through a supporting nail;
and the foamed aluminum and the stainless steel outer protective layer are bonded through an epoxy resin adhesive.
The high-explosion-resistance high-strength foamed aluminum-steel tube concrete composite column comprises concrete. In the present invention, the concrete is preferably self-compacting concrete. In the invention, the concrete preferably comprises the following components in parts by weight: 294.88-370.14 parts of cement, 68.05-85.42 parts of fly ash, 90.73-113.89 parts of granulated blast furnace slag powder, 864-945 parts of crushed stone, 740.68-774.86 parts of sand, 45.37-56.95 parts of an expanding agent, 6.80-8.54 parts of a water reducing agent and 116.95-145.38 parts of water; more preferably 300-360 parts of cement, 70-82 parts of fly ash, 95-110 parts of granulated blast furnace slag powder, 870-935 parts of crushed stone, 745-760 parts of sand, 48-55 parts of an expanding agent, 6.9-8.3 parts of a water reducing agent and 118-142 parts of water. According to the invention, by selecting the components of the concrete and adjusting the proportion of the components, the concrete column in the concrete column has higher hardening strength, so that the mechanical property and the anti-explosion capability of the whole composite column are effectively improved.
In the invention, the concrete preferably comprises 294.88-370.14 parts of cement, and more preferably 300-360 parts of cement. In the present invention, the cement is preferably ordinary portland cement; the strength grade of the ordinary portland cement is preferably 52.5; fe of the Portland cement2O3The content of the component is preferably 2.5 to 3%, more preferably 2.6 to 2.8%. The invention selects the ordinary portland cement and preferably selects the strength grade and Fe2O3The components content can enable the formed cementing material to have better hardening effect in the steel pipe, thereby being more suitable for pouring and maintaining the steel pipe and being more beneficial to finally obtaining the foamed aluminum-steel pipe concrete composite column with high strength.
In the invention, the concrete preferably comprises 68.05-85.42 parts of fly ash, more preferably 70-82 parts of cement in 294.88-370.14 parts by weight. In the invention, the fly ash is preferably grade I fly ash; the mixing amount of the fly ash is preferably 15-20% of the mass of the cement, more preferably 16-18%, and most preferably 18%. According to the invention, by selecting the grade and the mixing amount of the fly ash, the cementing material formed by the fly ash and cement has better hydraulicity and higher strength, the workability of concrete is effectively improved, the phenomena of separation and water precipitation of concrete particles are reduced, the shrinkage and cracking of the concrete are reduced, the corrosion of stray current to a steel pipe outside the concrete is inhibited, the service life of the steel pipe concrete inside the composite column is prolonged, and the reconstruction cost of the steel pipe concrete is reduced.
In the invention, the concrete preferably comprises 90.73-113.89 parts of granulated blast furnace slag powder, more preferably 95-110 parts of cement in 294.88-370.14 parts by weight. In the present invention, the granulated blast furnace slag powder is preferably granulated blast furnace slag powder of grade S95; the mixing amount of the granulated blast furnace slag powder is preferably 15-20% of the mass of the cement, more preferably 18-20%, and most preferably 20%. According to the invention, by selecting the grade and the mixing amount of the granulated blast furnace slag powder, the activity of a cementing material can be increased by utilizing the higher specific surface area of the granulated blast furnace slag powder while the addition of cement components is reduced, and the gelation hardening effect is improved, so that the strength of concrete is improved, cracking is reduced, and the anti-explosion capability of the steel pipe concrete column is effectively improved.
In the invention, the concrete preferably comprises 864-945 parts by weight of crushed stone, more preferably 870-935 parts by weight of cement 294.88-370.14 parts by weight. In the present invention, the gradation of the crushed stones is preferably a continuous gradation; the particle size of the crushed stone is preferably 5-20 mm, more preferably 8-18 mm, and most preferably 10-15 mm. The invention can provide more excellent supporting capability as a coarse aggregate in a concrete system by selecting the particle size of the continuous graded broken stone, thereby enabling the concrete to have higher strength.
In the present invention, the source of the crushed stone is preferably dolomite crushed stone; the dolomite crushed stone is preferably CaCO with mass fraction not more than 55%3Fe of not more than 0.15 mass percent2O3More preferably, it comprises 40 to 55 mass% of CaCO30.05 to 0.15 mass percent of Fe2O3. According to the invention, by selecting the types and the compositions of the gravels, the higher compactness and water resistance of the gravels can be ensured, so that the concrete in the steel pipe with a closed environment has higher strength compared with the concrete in a common environment.
In the invention, the concrete preferably comprises 740.68 to 774.86 parts by weight of sand, and more preferably 745 to 760 parts by weight of cement in an amount of 294.88 to 370.14 parts by weight. In the present invention, the source of the sand is preferably machine-made dolomite medium sand; the sand is preferably graded in zone ii. According to the invention, the machine-made dolomite medium sand in the grading II area is preferably selected as a finer aggregate, so that gaps of large-particle-size crushed stones can be filled, and the self-compaction degree of concrete is improved.
In the invention, the concrete preferably comprises 45.37-56.95 parts of expanding agent, more preferably 48-55 parts of cement in 294.88-370.14 parts by weight. In the present invention, the swelling agent is preferably an AEA swelling agent; the mixing amount of the expanding agent is preferably 8-15%, more preferably 9-12%, and most preferably 10% of the mass of the cement. According to the invention, by selecting the type and the mixing amount of the expanding agent, the expanding agent can be matched with the added water amount, so that the problem of cracking of concrete caused by the evaporation of a large amount of water in the hardening period is avoided, and the hardening strength of the concrete is effectively improved.
In the invention, the concrete preferably comprises 6.80-8.54 parts of water reducing agent, more preferably 6.9-8.3 parts of cement in 294.88-370.14 parts by weight. In the invention, the water reducing agent is preferably a polycarboxylic acid high-efficiency water reducing agent; the water reducing rate of the water reducing agent is preferably 20-30%, more preferably 25-30%, and most preferably 30%; the mixing amount of the water reducing agent is preferably 0.7-1.8% of the mass of the cement, more preferably 1.5-1.8%, and most preferably 1.5%. According to the invention, by selecting the type, the water reducing rate and the mixing amount of the water reducing agent, cement particles can be better dispersed, the unit water consumption is reduced, and the fluidity of the concrete slurry is improved, so that the concrete slurry has better fluidity under the condition of less water consumption, the problem of cracking of the concrete caused by evaporation of a large amount of water during drying is avoided, and the hardening strength of the concrete is effectively improved.
In the invention, the concrete water preferably comprises 116.95-145.38 parts by weight, more preferably 118-142 parts by weight of 294.88-370.14 parts by weight of cement. In the present invention, the water is preferably water that meets the concrete mixing water standard JGJ 63-2006. The invention can lead the gelling system to have better gelling effect by selecting the water which meets the concrete standard, and avoid the coagulation and sedimentation of the gelling system caused by more impurities in the water, thereby leading the concrete to have higher hardening strength.
The high-explosion-resistance high-strength foamed aluminum-steel tube concrete composite column comprises a steel tube arranged outside concrete.
In the present invention, the sectional shape of the steel pipe preferably includes a circle or a polygon; when the steel pipe is round, the inner diameter of the steel pipe is preferably more than or equal to 100mm, more preferably more than or equal to 120mm, and most preferably more than or equal to 150 mm; the steel pipe is preferably a regular equilateral polygon when the steel pipe is a polygon; the length of the inner side of the equilateral polygon is preferably equal to or more than 100mm, more preferably equal to or more than 120mm, and most preferably equal to or more than 150 mm. According to the invention, the cross-sectional area of the concrete poured in the steel pipe can be determined by selecting the cross-sectional area of the inner diameter of the steel pipe, and the steel pipe concrete column can be ensured to have enough capacity of resisting the deformation of external explosion shock waves, so that large displacement or collapse is not easy to occur during explosion.
In the invention, when the steel pipe is round, a welded circular steel pipe or a hot-rolled seamless steel pipe is preferably adopted; when the steel pipe is a polygonal steel pipe, a welded steel pipe or a cold-formed steel pipe is preferably adopted. According to the invention, the forming mode of the steel tube is selected according to the shape of the steel tube, so that the steel tube concrete column has higher bearing capacity on concrete under various shape selections, and has higher strength and anti-explosion capacity.
In the present invention, the material of the steel pipe preferably includes Q235, Q345 or Q390. The invention can keep higher strength, corrosion resistance and impact resistance when the nodular cast iron steel pipe is in long-term contact with concrete.
In the present invention, the thickness of the steel pipe is preferably not less than 3mm, more preferably not less than 5 mm. The steel pipe has more excellent deformation resistance in explosion through selecting the thickness of the steel pipe, and concrete in the steel pipe is better protected from cracking caused by impact.
In the invention, the outer wall of the steel pipe is provided with a plurality of supporting nails; the steel pipe and the foamed aluminum are fixedly connected through a supporting nail. According to the invention, the supporting nails are arranged on the outer wall of the steel pipe, so that the steel pipe and the foamed aluminum can be tightly connected, and the steel pipe is difficult to displace or deform even if being subjected to shock waves during explosion, so that the composite column has more excellent anti-explosion capability; meanwhile, the inner steel pipe concrete column is connected with the outer foamed aluminum and stainless steel protective layers through the supporting nails, so that the outer foamed aluminum and stainless steel protective layers can be replaced in time when damaged, and the steel pipe concrete column is convenient and quick to use, and time and labor are saved.
In the present invention, the support pins are preferably welded to the outer wall of the steel pipe.
The length of the supporting nail is not particularly limited, and the length can be determined according to the distance between the steel pipe and the foamed aluminum in field operation. In the invention, the longitudinal distance of the supporting nails along the length direction of the steel pipe is preferably 300-500 mm, more preferably 320-450 mm, and most preferably 350-400 mm; the ratio of the number of rows of the supporting nails to the circumference of the outer wall of the steel pipe is preferably 1: 78-160, more preferably 1: 80-130, and most preferably 1: 100-120. According to the invention, the total number of the support nails arranged on the outer wall of the steel pipe can be determined by selecting the longitudinal distance and the number of the rows of the support nails, so that the firmness of the fixed connection between the steel pipe and the foamed aluminum can be controlled, and the foamed aluminum-steel pipe concrete composite column has more excellent deformation and displacement resistance during explosion.
The high-explosion-resistance high-strength foamed aluminum-steel tube concrete composite column comprises foamed aluminum arranged outside a steel tube. In the invention, the foamed aluminum is preferably aramid fiber reinforced foamed aluminum; the preparation method of the aramid fiber reinforced foamed aluminum preferably comprises the following steps:
i, carrying out surface treatment on aramid fibers to obtain pretreated aramid fibers;
II, mixing the pretreated aramid fiber obtained in the step I with an aluminum-based material melt to obtain a composite melt;
and III, sequentially stirring, foaming and cooling the composite melt obtained in the step II to obtain aramid fiber reinforced foamed aluminum.
The invention preferably carries out surface treatment on the aramid fiber to obtain the pretreated aramid fiber.
In the present invention, the surface treatment of the aramid fiber in step i preferably includes the steps of:
placing aramid fiber in an acetone solution for ultrasonic treatment to obtain ultrasonic-treated aramid fiber;
placing the ultrasonic-treated aramid fiber obtained in the step one in a KOH solution, oscillating and stirring the ultrasonic-treated aramid fiber by using ultrasonic waves, and then cleaning the ultrasonic-treated aramid fiber by using distilled water to obtain coarsened aramid fiber;
thirdly, soaking the coarsened aramid fiber obtained in the second step in dilute nitric acid, and then washing the aramid fiber with distilled water to be neutral to obtain neutralized aramid fiber;
soaking and stirring the neutralized aramid fiber obtained in the step III in a sensitizing solution, taking out and washing the aramid fiber with distilled water to obtain sensitized aramid fiber;
fifthly, placing the sensitized aramid fiber obtained in the step IV into an activation solution to be quickly stirred to obtain activated aramid fiber;
sixthly, carrying out reduction treatment on the activated aramid fiber obtained in the fifth step to obtain reduced aramid fiber;
seventhly, placing the reduction-treated aramid fiber obtained in the step sixthly into a chemical nickel plating solution for chemical deposition to obtain the pretreated aramid fiber.
According to the invention, the aramid fiber is preferably placed in an acetone solution for ultrasonic treatment to obtain the ultrasonic-treated aramid fiber.
In the invention, the time of ultrasonic treatment is preferably 80-100 min, and more preferably 85-95 min.
After the ultrasonic treatment aramid fiber is obtained, the ultrasonic treatment aramid fiber is preferably placed in a KOH solution and is stirred by ultrasonic oscillation, and then is washed by distilled water to obtain the coarsened aramid fiber.
In the invention, the concentration of the KOH solution is preferably 30-35 g/L, and more preferably 35 g/L.
In the invention, the time for ultrasonic oscillation stirring is preferably 100-120 min, and more preferably 120 min.
After the coarsened aramid fiber is obtained, the coarsened aramid fiber is preferably soaked in dilute nitric acid, and then washed to be neutral by distilled water to obtain the neutralized aramid fiber.
In the invention, the mass concentration of the dilute nitric acid is preferably 20-30%, and more preferably 30%.
In the invention, the soaking time is preferably 6-10 min, and more preferably 7-9 min.
After the neutralization treatment aramid fiber is obtained, the neutralization treatment aramid fiber is preferably placed in a sensitizing solution to be soaked and stirred, and is taken out to be washed by distilled water, so that the sensitization treatment aramid fiber is obtained.
In the invention, the sensitizing solution preferably comprises 10-15 g/L SnCl2With 40-45 ml/L HCl, more preferably 15g/L SnCl2And 45ml/L HCl.
In the invention, the stirring time is preferably 4-7 min, and more preferably 5-6 min.
After the sensitization aramid fiber is obtained, the sensitization aramid fiber is preferably placed in an activation solution to be rapidly stirred to obtain the activation aramid fiber.
In the invention, the activating solution preferably comprises 0.3-0.5 g/L of PdCl2With 8-10 ml/L HCl, more preferably 0.5g/L PdCl2And 10ml/L HCl.
In the invention, the time for rapid stirring is preferably 3-5 min, and more preferably 5 min.
After the activated aramid fiber is obtained, the activated aramid fiber is preferably subjected to reduction treatment to obtain the reduced aramid fiber.
In the invention, the reducing liquid of the reduction treatment is preferably NaH with the concentration of 20-30 g/L2PO2More preferably 30g/L of NaH2PO2。
In the present invention, the time for the reduction treatment is preferably 3 to 5min, and more preferably 5 min.
After the reduction treatment aramid fiber is obtained, the reduction treatment aramid fiber is preferably placed in a chemical nickel plating solution for chemical deposition to obtain the pretreated aramid fiber.
In the present invention, the components of the electroless nickel plating solution preferably include: nickel sulfate hexahydrate (NiSO)4·6H2O) 30-45 g/L, sodium hypophosphite (NaH)2PO2·H2O) 30-45 g/L, anhydrous sodium acetate (CH)3COONa 15-25 g/L, sodium citrate (C)6H5Na3O7·2H2O) 10-20 g/L, 1-2 mg/L of potassium sodium tartrate; more preferablyIncluding nickel sulfate hexahydrate (NiSO)4·6H2O) 35-40 g/L, sodium hypophosphite (NaH)2PO2·H2O) 35-40 g/L, anhydrous sodium acetate (CH)3COONa 18-20 g/L, sodium citrate (C)6H5Na3O7·2H2O) 12-18 g/L, and sodium potassium tartrate 1.5-1.8 mg/L.
In the present invention, the pH of the electroless plating solution is preferably 4.5 to 6.0, and more preferably 4.8 to 5.8.
In the invention, the temperature of the chemical nickel plating solution is preferably 58-62 ℃, and more preferably 60-61 ℃.
In the invention, the chemical deposition time is preferably 50-60 min, and more preferably 52-58 min.
In the invention, the length of the pretreated aramid fiber is preferably 3-7 mm, and more preferably 4-6 mm.
After the pretreated aramid fiber is obtained, the obtained pretreated aramid fiber is preferably mixed with the aluminum-based material melt subjected to smelting treatment to obtain the composite melt.
The kind of the aluminum-based material is not particularly limited in the present invention, and commercially pure aluminum or aluminum alloy known in the art may be used.
In the invention, the addition amount of the pretreated aramid fiber is preferably 4-10% of the mass of the aluminum-based material, and more preferably 5-8%.
In the present invention, the smelting process preferably comprises: keeping the temperature of 700-800 ℃ for 80-90 min, and then cooling to 660-720 ℃; more preferably, the method comprises the steps of preserving heat at 700-800 ℃ for 80-90 min, and then cooling to 660-720 ℃.
In the present invention, the melt is preferably mixed by a stirrer driven by a speed-regulating motor.
After the aramid fiber aluminum-based composite material is obtained, the composite melt is preferably stirred, foamed and cooled in sequence to obtain aramid fiber reinforced foamed aluminum.
In the present invention, the operation of the stirring is preferably stirring by a stirrer driven by a speed-adjustable motor.
In the present invention, the foaming agent to be foamed is preferably TiH2(ii) a The TiH2The amount of addition of (B) is preferably 0.5 to 1.5% by mass, more preferably 0.6 to 1.2% by mass, based on the aluminum-based material.
In the invention, the foaming time is preferably 5-8 min, and more preferably 6-7 min.
In the present invention, the cooling is preferably performed by air cooling or water cooling.
In the invention, the thickness of the foamed aluminum is preferably 2 to 5 times, more preferably 2.5 to 4.5 times, and most preferably 3 to 4 times of the thickness of the steel pipe. According to the invention, the thickness of the foamed aluminum is selected, and the porous structure of the foamed aluminum can ensure that the foamed aluminum has higher capacity of absorbing explosion shock waves, so that the concrete-filled steel tubular column inside is protected, and the deformation and displacement are reduced.
The high-explosion-resistance high-strength foamed aluminum-steel tube concrete composite column comprises an epoxy resin adhesive arranged outside foamed aluminum. In the invention, the foamed aluminum and the stainless steel outer protective layer are bonded by epoxy resin adhesive. The invention leads the foamed aluminum and the stainless steel outer protective layer to be tightly bonded through the adhesive to form a fixed composite outer protective layer, leads the porous structure of the foamed aluminum to be combined with the high strength of the stainless steel, and greatly reduces the damage of the foamed aluminum-steel pipe concrete composite column in explosion.
The stainless steel source of the stainless steel outer protective layer is not particularly limited in the present invention, and commercially available stainless steel known to those skilled in the art may be used.
In the present invention, the epoxy resin adhesive is preferably a fiber-reinforced adhesive for building structures, and the source of the fiber-reinforced adhesive for building structures is not particularly limited, and commercially available fiber-reinforced adhesives for building structures well known to those skilled in the art may be used.
The high-explosion-resistance high-strength foamed aluminum-steel tube concrete composite column comprises a stainless steel outer protective layer arranged outside the epoxy resin adhesive. In the invention, the thickness of the stainless steel outer protection layer is preferably 10-50% of the thickness of the steel pipe, more preferably 15-45%, and most preferably 20-40%. The invention can further improve the strength of the composite outer protective layer formed by the foamed aluminum by selecting the thickness of the steel outer protective layer, thereby having higher anti-explosion capability.
In the present invention, the stainless steel outer protective layer preferably includes two stainless steel sheets butt-welded.
The invention also provides a preparation method of the high antiknock high-strength foamed aluminum-steel tube concrete composite column, which comprises the following steps:
(1) welding a support nail on the outer wall of the steel pipe to obtain the steel pipe welded with the support nail;
(2) pouring concrete into the steel tube welded with the support nail obtained in the step (1) to obtain a steel tube concrete column;
(3) adhering foamed aluminum to the inner surface of the stainless steel outer protective layer by using an epoxy resin adhesive to obtain a composite outer protective layer;
(4) welding the supporting nails on the outer wall of the steel pipe concrete column obtained in the step (2) with the foamed aluminum of the composite outer protective layer obtained in the step (3), and then butt-welding the stainless steel outer protective layers to obtain the high-antiknock high-strength foamed aluminum-steel pipe concrete composite column;
the steps (1) and (3) are not in sequence.
The invention welds the supporting nail on the outer wall of the steel pipe to obtain the steel pipe welded with the supporting nail.
In the invention, the steel pipe is preferably pretreated before the support nail is welded on the outer wall of the steel pipe; the pretreatment preferably comprises: and cleaning oil stains, oxide scales or other pollutants on the inner surface and the outer surface of the steel pipe, and then deeply polishing the outer surface of the steel pipe to keep the steel pipe clean and flat.
After the steel pipe welded with the support nail is obtained, the concrete is poured into the obtained steel pipe welded with the support nail to obtain the steel pipe concrete column.
The casting rate of the concrete is not particularly limited in the present invention.
In the invention, after the concrete is poured into the obtained steel pipe welded with the support nail, the concrete is preferably cured; the maintenance environment is preferably a temporary closure of the steel pipe. The time for the temporary sealing is not particularly limited in the present invention. According to the invention, the steel pipe is temporarily sealed, so that the poured concrete achieves the effect of retarding, the water evaporation rate is reduced, and the concrete is prevented from drying and cracking.
The invention uses epoxy resin adhesive to bond the foamed aluminum on the inner surface of the stainless steel outer protective layer to obtain the composite outer protective layer.
After the steel pipe concrete column and the composite outer protective layer are obtained, the support nails on the outer wall of the obtained steel pipe concrete column are welded with the foamed aluminum of the obtained composite outer protective layer, and then the stainless steel outer protective layer is welded in a butt joint mode to obtain the high-antiknock high-strength foamed aluminum-steel pipe concrete composite column. The steps of obtaining the concrete filled steel tubular column and the composite outer protective layer are not in sequence. The welding operation of the support pin and the foamed aluminum is not particularly limited in the present invention, and a welding method known to those skilled in the art may be adopted.
The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
As shown in fig. 1 and fig. 2, the aluminum foam-steel tube concrete composite column with high explosion resistance and high strength provided in this embodiment sequentially comprises, from inside to outside, concrete 1, a steel tube 2, aluminum foam 3, an epoxy resin adhesive 4, and a stainless steel outer protective layer 5.
The concrete 1 comprises the following components in parts by weight: cement (Portland cement of strength grade 52.5, Fe2O3295.00 parts of 2.6-2.8 percent of component content, 68.08 parts of fly ash (I grade, the mixing amount of the fly ash is 23.08 percent of the mass of the cement), and 90.7 parts of granulated blast furnace slag powder (S95 grade, the mixing amount of the fly ash is 30.77 percent of the mass of the cement)7 parts of crushed stone (dolomite crushed stone with the grain diameter of 5-20 mm and continuous gradation, containing 40-55 mass percent of CaCO30.05 to 0.15 mass percent of Fe2O3)944.30 parts, 740.97 parts of sand (machine-made dolomite medium sand with the grading grade of II zone), 45.39 parts of expanding agent (AEA expanding agent, the mixing amount of which is 15.39 percent of the mass of the cement), 6.81 parts of water reducing agent (polycarboxylic acid high-efficiency water reducing agent, the mixing amount of which is 2.31 percent of the mass of the cement) and 138.77 parts of water (water of the concrete mixing water standard JGJ 63-2006).
The steel pipe 2 of the embodiment adopts a round Q345 hot-rolled seamless steel pipe, the inner diameter is 200mm, the thickness is 3mm, the outer diameter is 206mm, the length is 2500mm, the support nails are welded along the length direction of the steel pipe 2 at intervals of 500mm, the number of longitudinal rows is 6, namely the ratio of the number of the longitudinal rows to the perimeter of the outer wall of the steel pipe is 1:105, and the length of the support nails is 8 mm;
the foamed aluminum 3 of this embodiment adopts aramid fiber reinforced foamed aluminum, and thickness is 3 times of the steel pipe thickness, aramid fiber reinforced foamed aluminum preparation process is as follows:
i, carrying out surface treatment on aramid fibers to obtain pretreated aramid fibers, wherein the specific process is as follows:
firstly, placing aramid fiber in an acetone solution for ultrasonic treatment for 90min to remove surface oil stains; then placing the deoiled aramid fiber in 35g/L KOH solution at 45 ℃, stirring for 100min by ultrasonic oscillation, roughening the aramid fiber, and then cleaning the aramid fiber by using distilled water; then, placing the deoiled and coarsened aramid fiber in dilute nitric acid with the mass concentration of 30% for soaking for 8min, and then washing the alkali on the surface with distilled water to be neutral; then placing the neutralized aramid fiber in SnCl with the concentration of 15g/L2Soaking in sensitizing solution prepared from 45ml/L HCl, stirring for 5min, taking out, and washing with distilled water; then the sensitized sample is placed in 0.5g/L PdCl2Rapidly stirring with 10ml/L HCl activating solution for 5min to activate the sample; then placing the activated aramid fiber in NaH of 30g/L2PO2Reducing for 5min to remove the surface activating solution; finally, the aramid fiber subjected to surface pretreatment is put into a chemical nickel plating solutionStarting chemical deposition, wherein the chemical nickel plating solution comprises the following components in percentage by weight: nickel sulfate (NiSO)4·6H2O)40g/L, sodium hypophosphite (NaH)2PO2·H2O)35g/L, anhydrous sodium acetate (CH)3COONa)20g/L, sodium citrate (C)6H5Na3O7·2H2O)15g/L, 1.5mg/L of potassium sodium tartrate, controlling the pH value of the chemical nickel plating solution to be 4.7, controlling the temperature of the chemical nickel plating solution to be 60 ℃, and controlling the chemical nickel plating time to be 60min to obtain the pretreated aramid fiber with the thickness of 3-7 mm.
II, mixing the pretreated aramid fiber obtained in the step I with a melt of an aluminum-based material subjected to smelting treatment to obtain a composite melt, wherein the specific process is as follows:
putting a small industrial pure aluminum ingot into a cast iron crucible furnace coated with protective coating, heating to 850 ℃, and preserving heat for 90min to obtain an aluminum melt; and (3) reducing the temperature of the obtained aluminum melt to 700 ℃, adding pretreated aramid fibers accounting for 8% of the mass of the aluminum melt into the aluminum melt, and uniformly stirring by using a stirrer driven by a speed regulating motor to obtain the composite melt.
III, sequentially stirring, foaming and cooling the composite melt obtained in the step II to obtain aramid fiber reinforced foamed aluminum, wherein the specific process is as follows:
TiH with the mass of 1.0 percent of the mass of the aluminum melt is added into the aramid fiber aluminum-based composite material2And uniformly stirring by a stirrer driven by a speed regulating motor, foaming for 6min, taking out from the crucible after foaming is finished, and air-cooling to solidify to obtain the aramid fiber reinforced foamed aluminum.
The foamed aluminum 3 and the stainless steel outer protective layer 5 are bonded by an epoxy resin adhesive 4, and the epoxy resin adhesive 4 of the embodiment is a fiber reinforced adhesive for a commercial building structure.
The stainless steel of the stainless steel outer protective layer 5 of the present embodiment is 304 stainless steel, and has a thickness of 20% of the thickness of the steel pipe 2.
The preparation method of the high-explosion-resistance high-strength foamed aluminum-steel tube concrete composite column comprises the following specific steps:
(1) cleaning oil stains, oxide scales or other pollutants on the inner surface and the outer surface of the steel pipe 2, and then deeply polishing the outer surface of the steel pipe 2 to keep the steel pipe clean and flat; then welding a support nail on the outer wall of the steel pipe 2 to obtain the steel pipe 2 welded with the support nail;
(2) pouring concrete into the steel pipe 2 welded with the support nail obtained in the step (1), then temporarily sealing the steel pipe 2 for maintenance, and obtaining a steel pipe concrete column after the concrete strength meets the requirement;
(3) adhering foamed aluminum 3 to the inner surface of the stainless steel outer protective layer 4 by using an epoxy resin adhesive 4 to obtain a composite outer protective layer;
(4) and (3) welding the supporting nails on the outer wall of the steel pipe concrete column obtained in the step (2) with the foamed aluminum 3 of the composite outer protective layer obtained in the step (3), and then butt-welding the stainless steel outer protective layer 4 to obtain the high-antiknock high-strength foamed aluminum-steel pipe concrete composite column.
Example 2
In the embodiment, the components of the concrete 1 in the embodiment 1 are replaced by the following components in parts by mass: cement (Portland cement of strength grade 52.5, Fe2O3315.00 parts of 2.6-2.8 percent of component content, 72.69 parts of fly ash (grade I, the mixing amount of the fly ash is 23.08 percent of the mass of the cement), 96.92 parts of granulated blast furnace slag powder (grade S95, the mixing amount of the fly ash is 30.77 percent of the mass of the cement), crushed stone (continuous graded dolomite crushed stone with the grain diameter of 5-20 mm and the mass fraction of CaCO of 40-55 percent30.05 to 0.15 mass percent of Fe2O3)921.47 parts, 750.60 parts of sand (machine-made dolomite medium sand with the grading grade of II region), 48.46 parts of an expanding agent (AEA expanding agent, the mixing amount of the AEA expanding agent is 15.39% of the mass of the cement), 7.27 parts of a water reducing agent (a polycarboxylic acid high-efficiency water reducing agent, the mixing amount of the polycarboxylic acid high-efficiency water reducing agent is 2.31% of the mass of the cement) and 134.67 parts of water (water of the concrete mixing water standard JGJ 63-2006);
in the embodiment, the material of the steel pipe 2 in the embodiment 1 is replaced by Q345, the thickness of the foamed aluminum 3 is replaced by 4 times of the thickness of the steel pipe 2, and the thickness of the stainless steel outer protection layer 4 is still 20% of the thickness of the steel pipe 2; the remaining technical features are the same as those of example 1.
Example 3
In the embodiment, the components of the concrete 1 in the embodiment 1 are replaced by the following components in parts by mass: cement (Portland cement of strength grade 52.5, Fe2O3335.00 parts of 2.6-2.8 percent of component content, 77.31 parts of fly ash (grade I, the mixing amount of the fly ash is 23.08 percent of the mass of the cement), 103.08 parts of granulated blast furnace slag powder (grade S95, the mixing amount of the granulated blast furnace slag powder is 30.77 percent of the mass of the cement), crushed stone (continuous graded dolomite crushed stone with the particle size of 5-20 mm and CaCO with the mass fraction of 40-55 percent30.05 to 0.15 mass percent of Fe2O3)919.26 parts, 751.54 parts of sand (machine-made dolomite medium sand with the grading grade of II zone), 51.54 parts of expanding agent (AEA expanding agent, the mixing amount of which is 15.39 percent of the mass of the cement), 7.73 parts of water reducing agent (polycarboxylic acid high-efficiency water reducing agent, the mixing amount of which is 2.31 percent of the mass of the cement) and 127.53 parts of water (water of the concrete mixing water standard JGJ 63-2006).
In the embodiment, the material of the steel pipe 2 in the embodiment 1 is replaced by Q345, the thickness of the steel pipe 2 is replaced by 4mm, the outer diameter is 208mm, the thickness of the foamed aluminum 3 is replaced by 3 times of the thickness of the steel pipe 2, and the thickness of the stainless steel outer protection layer 4 is still 20% of the thickness of the steel pipe 2; the remaining technical features are the same as those of example 1.
Example 4
In the embodiment, the components of the concrete 1 in the embodiment 1 are replaced by the following components in parts by mass: cement (Portland cement of strength grade 52.5, Fe2O3350.00 parts of 2.6-2.8 percent of component content, 80.77 parts of fly ash (grade I, the mixing amount of the fly ash is 23.08 percent of the mass of the cement), 107.69 parts of granulated blast furnace slag powder (grade S95, the mixing amount of the fly ash is 30.77 percent of the mass of the cement), 911.06 parts of crushed stone, sand (continuous graded dolomite crushed stone with the grain diameter of 5-20 mm and containing 40-55 percent of CaCO by mass fraction30.05 to 0.15 mass percent of Fe2O3)755.00 parts, 53.85 parts of an expanding agent (AEA expanding agent, the mixing amount of which is 15.39 percent of the mass of the cement), 8.10 parts of a water reducing agent (polycarboxylic acid high-efficiency water reducing agent, the mixing amount of which is 2.31 percent of the mass of the cement) and 123.14 parts of water (water of the concrete mixing water standard JGJ 63-2006).
In the embodiment, the material of the steel pipe 2 in the embodiment 1 is replaced by Q345, and the thickness of the stainless steel outer protection layer 4 is replaced by 35 percent of the thickness of the steel pipe 2; the remaining technical features are the same as those of example 1.
Example 5
In the embodiment, the components of the concrete 1 in the embodiment 1 are replaced by the following components in parts by mass: cement (Portland cement of strength grade 52.5, Fe2O3360.00 parts of 2.6-2.8 percent of component content, 83.08 parts of fly ash (grade I, the mixing amount of the fly ash is 23.08 percent of the mass of the cement), 110.77 parts of granulated blast furnace slag powder (grade S95, the mixing amount of the fly ash is 30.77 percent of the mass of the cement), crushed stone (continuous graded dolomite crushed stone with the grain diameter of 5-20 mm and the mass fraction of CaCO of 40-55 percent30.05 to 0.15 mass percent of Fe2O3)912.35 parts, 754.45 parts of sand (machine-made dolomite medium sand with the grading grade of II zone), 55.38 parts of expanding agent (AEA expanding agent, the mixing amount of which is 15.38 percent of the mass of the cement), 8.31 parts of water reducing agent (polycarboxylic acid high-efficiency water reducing agent, the mixing amount of which is 2.31 percent of the mass of the cement) and 119.22 parts of water (water of the concrete mixing water standard JGJ 63-2006).
In the embodiment, the material of the steel pipe 2 in the embodiment 1 is replaced by Q345, the inner diameter of the steel pipe 2 is replaced by 220mm, the thickness of the foamed aluminum 3 is 3 times of that of the steel pipe 2, and the thickness of the stainless steel outer protection layer 4 is 20% of that of the steel pipe 2; the remaining technical features are the same as those of example 1.
Comparative example 1
The technical characteristics of the comparative example are the same as those of example 1, and only the steel tube concrete column in step (2) of the preparation method of the high-explosion-resistance high-strength foamed aluminum-steel tube concrete composite column described in example 1 is obtained.
The compressive strength and the flexural strength of the concrete in the above examples 1-5 were tested according to GB/50081-2019 test method Standard for physical and mechanical Properties of concrete. The test data are shown in table 1.
TABLE 1 compressive and flexural Strength values for the concretes in examples 1-5
As can be seen from Table 1, the concrete of the embodiments 1 to 5 of the invention has a compressive strength of 25.13 to 35.53MPa in 7d, a compressive strength of 38.58 to 56.64MPa in 14d and a compressive strength of 48.23 to 69.12MPa in 28 d; the 28d rupture strength can reach 4.38-6.28 MPa, and the concrete disclosed by the invention is suitable for a pouring environment in a steel pipe, and has high strength after being hardened, so that the high-explosion-resistant high-strength foamed aluminum-steel pipe concrete composite column has high strength as a whole, can effectively resist explosion impact, cannot be easily cracked or even collapsed, and further has excellent explosion-resistant capability.
Table 2 shows the mid-span displacement of the foamed aluminum-steel tube concrete composite column with high explosion resistance and high strength obtained in the embodiments 1 to 5 of the invention and the steel tube concrete column obtained in the preparation process under the same explosive impact load (25kgTNT explosive equivalent).
TABLE 2 comparison of mid-span displacements of different components under the effect of explosive loads
| Name (R) | Mid-span displacement/mm |
| Comparative example 1 | 62.50 |
| Example 1 | 38.75 |
| Example 2 | 34.10 |
| Example 3 | 29.67 |
| Example 4 | 25.22 |
| Example 5 | 22.70 |
As can be seen from Table 2, when the steel pipe concrete columns obtained in comparative example 1 and examples 1 to 5 of the invention and the high-explosion-resistance high-strength foamed aluminum-steel pipe concrete composite column are tested under the same explosion impact load (25kgTNT explosive equivalent), the midspan displacement of the steel pipe concrete column in comparative example 1 reaches 62.5mm, and the midspan displacement of the high-explosion-resistance high-strength foamed aluminum-steel pipe concrete composite column is only 22.7-38.75 mm, which is far lower than that of the steel pipe concrete column in comparative example 1 without foamed aluminum and a stainless steel outer protective layer, and the internal concrete cracks are less. Therefore, the high-explosion-resistance high-strength foamed aluminum-steel tube concrete composite column has high strength and excellent explosion-resistance capability.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A high-explosion-resistance high-strength foamed aluminum-steel tube concrete composite column comprises concrete, a steel tube, foamed aluminum, an epoxy resin adhesive and a stainless steel outer protective layer which are sequentially arranged from inside to outside;
the outer wall of the steel pipe is provided with a plurality of supporting nails; the steel pipe and the foamed aluminum are fixedly connected through a supporting nail;
and the foamed aluminum and the stainless steel outer protective layer are bonded through an epoxy resin adhesive.
2. The high-explosion-resistance high-strength foamed aluminum-steel tube concrete composite column as claimed in claim 1, wherein the concrete comprises the following components in parts by mass: 294.88-370.14 parts of cement, 68.05-85.42 parts of fly ash, 90.73-113.89 parts of granulated blast furnace slag powder, 864-945 parts of crushed stone, 740.68-774.86 parts of sand, 45.37-56.95 parts of an expanding agent, 6.80-8.54 parts of a water reducing agent and 116.95-145.38 parts of water.
3. A high-explosion-resistance high-strength foamed aluminum-steel tube concrete composite column according to claim 1, wherein the cross-sectional shape of the steel tube comprises a circle or a polygon.
4. The high antiknock high-strength foamed aluminum-steel tube concrete composite column according to claim 1 or 3, wherein the material of the steel tube comprises Q235, Q345 or Q390.
5. The high-explosion-resistance high-strength foamed aluminum-steel tube concrete composite column as claimed in claim 4, wherein the thickness of the steel tube is more than or equal to 3 mm.
6. The high-explosion-resistance high-strength foamed aluminum-steel tube concrete composite column as claimed in claim 1, wherein the longitudinal distance of the supporting nails along the length direction of the steel tube is 300-500 mm; the ratio of the number of rows of the supporting nails to the circumference of the outer wall of the steel pipe is 1:78 to 160.
7. The high-explosion-resistance high-strength foamed aluminum-steel tube concrete composite column as claimed in claim 1, wherein the foamed aluminum is aramid fiber reinforced foamed aluminum.
8. The high-antiknock high-strength foamed aluminum-steel tube concrete composite column as claimed in claim 1 or 7, wherein the thickness of the foamed aluminum is 2-5 times that of the steel tube.
9. The high-explosion-resistance high-strength foamed aluminum-steel tube concrete composite column as claimed in claim 1, wherein the thickness of the stainless steel outer protective layer is 10-50% of the thickness of the steel tube.
10. The preparation method of the high-explosion-resistance high-strength foamed aluminum-steel tube concrete composite column as claimed in any one of claims 1 to 9, characterized by comprising the following steps:
(1) welding a support nail on the outer wall of the steel pipe to obtain the steel pipe welded with the support nail;
(2) pouring concrete into the steel tube welded with the support nail obtained in the step (1) to obtain a steel tube concrete column;
(3) adhering foamed aluminum to the inner surface of the stainless steel outer protective layer by using an epoxy resin adhesive to obtain a composite outer protective layer;
(4) welding the supporting nails on the outer wall of the steel pipe concrete column obtained in the step (2) with the foamed aluminum of the composite outer protective layer obtained in the step (3), and then butt-welding the stainless steel outer protective layers to obtain the high-antiknock high-strength foamed aluminum-steel pipe concrete composite column;
the steps (1) and (3) are not in sequence.
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