阅读说明：本技术 一种内贴cfrp的铝合金复合海水混凝土柱 (Aluminum alloy composite seawater concrete column internally pasted with CFRP ) 是由 陈宗平 徐炜圣 庞云升 覃伟恒 周济 于 2021-08-10 设计创作，主要内容包括：本发明公开了一种内贴CFRP的铝合金复合海水混凝土柱,属于海洋建筑工程结构技术领域。本发明的内贴CFRP的铝合金复合海水混凝土柱由海水混凝土、铝合金管以及CFRP布组成；所述CFRP布粘贴于铝合金管内壁形成CFRP-铝合金复合管,所述海水混凝土填充于CFRP-铝合金复合管内。本发明的复合柱利用铝合金管和CFRP作为外部结构,通过对内部混凝土的约束作用,可显著提高复合柱结构的耐腐蚀性能、承载力、抗震能力等使用性能。(The invention discloses an aluminum alloy composite seawater concrete column internally adhered with CFRP, belonging to the technical field of ocean building engineering structures. The aluminum alloy composite seawater concrete column internally adhered with the CFRP is composed of seawater concrete, an aluminum alloy pipe and CFRP cloth; the CFRP cloth is adhered to the inner wall of the aluminum alloy pipe to form a CFRP-aluminum alloy composite pipe, and the seawater concrete is filled in the CFRP-aluminum alloy composite pipe. The composite column provided by the invention uses the aluminum alloy pipe and the CFRP as external structures, and can remarkably improve the service performances of the composite column structure, such as corrosion resistance, bearing capacity, shock resistance and the like, through the constraint effect on internal concrete.)

1. The utility model provides an interior aluminium alloy composite seawater concrete post who pastes CFRP which characterized in that: the marine concrete pipe consists of marine concrete, an aluminum alloy pipe and CFRP cloth; the CFRP cloth is adhered to the inner wall of the aluminum alloy pipe to form a CFRP-aluminum alloy composite pipe, and the seawater concrete is filled in the CFRP-aluminum alloy composite pipe.

2. The aluminum alloy composite seawater concrete column internally pasted with CFRP as claimed in claim 1, which is characterized in that: the components of the seawater concrete are as follows: 480-type cement 490kg/m³Sand 530-540kg/m³1200 grade 1400kg/m stone³190 + 210kg/m seawater³(ii) a The seawater concrete is prepared by uniformly stirring and mixing the components.

3. The aluminum alloy composite seawater concrete column internally pasted with CFRP as claimed in claim 2, wherein: the sand is sea sand, in particular medium sand with fineness modulus of 2.71; the stone is crushed stone with the particle size of 5-31 mm.

4. The aluminum alloy composite seawater concrete column internally pasted with CFRP as claimed in claim 1, which is characterized in that: the CFRP cloth is formed by weaving unidirectional continuous carbon fibers.

5. The method for manufacturing the aluminum alloy composite seawater concrete column internally pasted with the CFRP as claimed in any one of claims 1 to 4, which is characterized by comprising the following steps:

(1) calculating the area of the inner wall according to the inner diameter of the aluminum alloy pipe, designing the transverse and longitudinal lap joint lengths, cutting the CFRP cloth into the size capable of winding the inner wall of the aluminum alloy pipe for one circle, or splicing a plurality of sections of the cut CFRP cloth into the CFRP cloth which is complete and capable of winding the inner wall of the aluminum alloy pipe for one circle;

(2) wiping and cleaning the inner wall of the aluminum alloy pipe by using alcohol, removing dust and attached impurities, and keeping the inner wall of the aluminum alloy pipe clean;

(3) uniformly coating structural adhesive on the inner wall of the aluminum alloy pipe and two surfaces of the CFRP cloth, and winding the CFRP cloth on a steel pipe with the diameter smaller than that of the aluminum alloy pipe;

(4) placing the steel pipe wound with the CFRP cloth into the aluminum alloy pipe, aligning and fixing the CFRP cloth and two ends of the aluminum alloy pipe, placing a reinforcing steel bar behind the steel pipe, slowly rotating the reinforcing steel bar to drive the steel pipe to roll forwards and separate the CFRP cloth from the steel pipe to be adhered to the inner wall of the aluminum alloy pipe, after the CFRP cloth is adhered, rolling the reinforcing steel bar for one circle around the inner wall of the aluminum alloy pipe again to discharge air bubbles, and ensuring that the CFRP cloth is tightly adhered to the inner wall to obtain the CFRP-aluminum alloy composite pipe;

(5) and after the structural adhesive is solidified, injecting seawater concrete into the CFRP-aluminum alloy composite pipe, and curing to obtain the aluminum alloy composite seawater concrete column internally attached with the CFRP.

6. The manufacturing method of the aluminum alloy composite seawater concrete column internally pasted with the CFRP as claimed in claim 5, characterized in that: the structural adhesive is carbon fiber impregnated adhesive.

Technical Field

The invention relates to the technical field of marine construction engineering structures, in particular to an aluminum alloy composite seawater concrete column internally attached with CFRP.

Background

At present, the combined structure of the concrete-filled steel tube is widely applied to civil engineering due to good mechanical and seismic properties, but the cost of later maintenance is higher due to the fact that the steel tube is easy to corrode, and therefore the concrete-filled steel tube has limitation in using under the environment of seawater and the like. In recent years, the use of carbon fiber Composites (CFRP) to improve the reliability of steel structures has received increasing attention from researchers. In the existing research, the high modulus and excellent tensile strength of CFRP materials are mainly utilized to improve the buckling and post-buckling performance of steel members. However, most of the researches are researches on reinforcing a common steel structure by using the CFRP, and researchers also use the corrosion resistance and high strength of the CFRP material to reinforce the steel pipe, and expect to play roles in preventing corrosion and improving bearing capacity. At present, the CFRP is adopted to enhance the structural mechanical property, and the CFRP is externally pasted. However, the CFRP externally attached is only subjected to force transmitted from the surface of the structure, and is also susceptible to process errors to cause early fracture and failure, and thus cannot fully exert its advantages.

China with application number CN202020702475.6 specially adapted for 2021, 1 month and 1 day discloses a reinforced composite aluminum alloy pipe structure, which comprises an aluminum pipe layer and a PE plastic inner layer, wherein the PE plastic inner layer is formed by compounding and sleeving a plurality of layers of materials, and the working procedure is relatively complex; china special for 2021, 1 and 22 with application number CN202020295440.5 discloses a corrosion-resistant composite structure for aluminum alloy, which is characterized in that the outer end of an inner ring steel pipe is connected with an aluminum alloy pipe, and two layers of isolating layers need to be grooved and embedded. The prior art disclosed above all have the problems of complex process and high manufacturing cost.

With the rapid development of coastal cities in China and the start of numerous large-scale construction projects, placer is used as an important building raw material, the demand rises linearly, more than 2.6 hundred million tons (about 1.3 billion cubic meters) of building sand are consumed every year, and the inland river sand resources are exhausted and limited, so that the sand supply can not meet the demand of the building sand in the market, and the contradiction between supply and demand is more and more severe. However, China has a long coastline and a wide shallow sea, and reserves abundant sea sand resources. If the sea sand can be used as fine aggregate for building to replace river sand, the problem of shortage of river sand and land resources can be effectively relieved, and meanwhile, a large amount of engineering construction cost is saved. Although sea sand is abundant in reserves and similar to river sand in physical characteristics, the content of chloride and sulfate in the untreated sea sand is higher than that of other sand and stones due to soaking in seawater for a long time, so that one of the difficulties in applying seawater and sea sand concrete to a steel pipe concrete structure is the corrosion problem of a steel pipe.

Disclosure of Invention

The invention aims to solve the problems in the prior art and provides the aluminum alloy composite seawater concrete column internally adhered with the CFRP.

In order to achieve the purpose, the technical scheme of the invention is as follows:

an aluminum alloy composite seawater concrete column internally pasted with CFRP is composed of seawater concrete, an aluminum alloy pipe and CFRP cloth; the CFRP cloth is adhered to the inner wall of the aluminum alloy pipe to form a CFRP-aluminum alloy composite pipe, and the seawater concrete is filled in the CFRP-aluminum alloy composite pipe.

Further, the seawater concrete comprises the following components: 480-type cement 490kg/m³Sand 530-540kg/m³1200 grade 1400kg/m stone³190 + 210kg/m seawater³(ii) a The seawater concrete is prepared by uniformly stirring and mixing the components.

Further, the sand is sea sand, in particular to medium sand with fineness modulus of 2.71; the stone is crushed stone with the particle size of 5-31 mm.

Furthermore, the CFRP cloth is formed by weaving unidirectional continuous carbon fibers, has the characteristics of high strength, small density, thin thickness and the like, and does not basically increase the self weight and the section size of a member.

The invention also provides a manufacturing method of the aluminum alloy composite seawater concrete column internally pasted with the CFRP, which comprises the following steps:

(1) calculating the area of the inner wall according to the inner diameter of the aluminum alloy pipe, designing the transverse and longitudinal lap joint lengths, cutting the CFRP cloth into the size capable of winding the inner wall of the aluminum alloy pipe for one circle, or splicing a plurality of sections of the cut CFRP cloth into the CFRP cloth which is complete and capable of winding the inner wall of the aluminum alloy pipe for one circle;

(2) the inner wall of the aluminum alloy pipe is wiped and cleaned by alcohol, dust and attached impurities are removed, the inner wall of the aluminum alloy pipe is kept clean, the bonding performance of structural adhesive in the subsequent process is not influenced, and the CFRP is ensured to be more firmly adhered;

(3) uniformly coating structural adhesive on the inner wall of the aluminum alloy pipe and two surfaces of the CFRP cloth, and winding the CFRP cloth on a steel pipe with the diameter smaller than that of the aluminum alloy pipe;

(4) placing the steel pipe wound with the CFRP cloth into the aluminum alloy pipe, aligning and fixing the CFRP cloth and two ends of the aluminum alloy pipe, placing a reinforcing steel bar behind the steel pipe, slowly rotating the reinforcing steel bar to drive the steel pipe to roll forwards and separate the CFRP cloth from the steel pipe to be adhered to the inner wall of the aluminum alloy pipe, after the CFRP cloth is adhered, rolling the reinforcing steel bar for one circle around the inner wall of the aluminum alloy pipe again to discharge air bubbles, and ensuring that the CFRP cloth is tightly adhered to the inner wall to obtain the CFRP-aluminum alloy composite pipe;

(5) and after the structural adhesive is solidified, injecting seawater concrete into the CFRP-aluminum alloy composite pipe, and curing to obtain the aluminum alloy composite seawater concrete column internally attached with the CFRP.

Further, the structural adhesive is carbon fiber impregnated adhesive.

The research of the invention finds that compared with carbon steel, the aluminum alloy has the following advantages: (1) the appearance is beautiful, the surface of the carbon steel has brownish red obvious rusts after being corroded, the aluminum alloy has grey white appearance, and the aluminum alloy can generate Al in the air₂O₃·3H₂The O oxidation film is used for blocking atmospheric corrosion, and the appearance color is not influenced; (2) the weight is light, the weight of the aluminum alloy is far lighter than that of carbon steel under the same volume, and the self weight of the structure can be obviously reduced in the actual engineering; (3) high material recovery rate and the like. However, in the actual engineering at present, the use of the aluminum alloy pipe concrete is less, mainly because the elastic modulus of the aluminum alloy is about one third of that of common carbon steel, the strength and ductility of the aluminum alloy pipe are slightly lower than those of a steel pipe.

According to the invention, the CFRP cloth is adopted to reinforce the inner wall of the aluminum alloy circular tube concrete column, so that on one hand, the problem of low elastic modulus of aluminum alloy can be solved, the constraint on core concrete is enhanced, and because the CFRP is extruded by the concrete and the tube wall, the residual part after tearing does not completely lose efficacy, the CFRP reinforcing effect can be better played, and the synergistic effect with the aluminum alloy tube is also improved; on the other hand, the high strength of the CFRP cloth is utilized to improve the bearing capacity of the CFRP cloth, the appearance of the aluminum alloy pipe is not influenced, the durability of the aluminum alloy structure in a seawater environment can be improved, and the CFRP cloth has excellent application prospects in the fields of ocean engineering, large-span structures, bridges and the like.

The invention at least comprises the following beneficial effects:

1. the CFRP cloth adopted by the invention is woven and formed by carbon fiber yarns, and has the advantages of light weight, high tensile strength, strong corrosion resistance and good durability; compared with the prior reinforcing method, the invention adopts the aluminum alloy pipe internally pasted with the CFRP, combines the advantages of the CFRP, has simpler structure and simpler working procedure, and does not change the integral appearance of the aluminum alloy pipe.

2. The inner-pasted CFRP aluminum alloy composite seawater concrete column structure provided by the invention utilizes the aluminum alloy pipe and the CFRP as external structures, and obviously improves the following service performances of the composite column structure through the constraint effect on the internal concrete: the corrosion resistance of the structure is improved; the bearing capacity of the structure is improved; the ductility and other shock resistance of the structure are enhanced; the constraint of the structure to the core concrete is improved. The inner-pasted CFRP aluminum alloy composite seawater concrete column structure integrates the advantages of two materials, effectively enhances the mechanical property of the structure, prevents the problems of aging and the like.

3. The internally-adhered CFRP aluminum alloy composite seawater concrete column can reduce the use of fresh water and inland river sand in the pouring process, isolate the corrosion of partial chemical substances to an aluminum alloy pipe by CFRP, simultaneously improve the bearing capacity of the aluminum alloy under the condition of ensuring the appearance of the aluminum alloy, better apply the aluminum alloy to ocean engineering by utilizing the corrosion resistance of the aluminum alloy, obviously reduce the self weight of the structure compared with the steel pipe concrete with the same size, and has positive significance for the practical engineering application.

4. The seawater concrete adopted by the invention takes the broken stones and the sea sand as concrete coarse aggregates and concrete fine aggregates respectively, takes the seawater as the water for mixing and maintaining, can be obtained from local resources, and reduces the production and transportation time and the economic cost; meanwhile, the CFRP-aluminum alloy composite pipe can well solve the corrosion problem of seawater, sea sand and the like.

Drawings

FIG. 1 is a schematic structural diagram of an aluminum alloy composite seawater concrete column internally attached with CFRP according to the invention;

FIG. 2 is a construction process diagram of adhering CFRP cloth to the inner wall of an aluminum alloy pipe in the invention;

FIG. 3 is a cut-away view of a CFRP internally attached aluminum alloy composite seawater concrete column specimen of the present invention.

Detailed Description

The invention is further described with reference to the following figures and specific examples.

Example 1

An aluminum alloy composite seawater concrete column with CFRP attached inside is composed of seawater concrete, aluminum alloy pipes and CFRP cloth as shown in figure 1; the CFRP cloth is adhered to the inner wall of the aluminum alloy pipe to form a CFRP-aluminum alloy composite pipe, and the seawater concrete is filled in the CFRP-aluminum alloy composite pipe.

The components of the seawater concrete of the present embodiment are as follows: 487kg/m ordinary portland cement with 42.5 cement strength grade³533kg/m of sand³Stone 1245kg/m³Sea water 201kg/m³(ii) a The sand is sea sand, in particular medium sand with fineness modulus of 2.71; the stone is crushed stone with the particle size of 5-31 mm; the components are stirred and mixed uniformly to prepare the seawater concrete, and the strength grade of the seawater concrete is C40.

The aluminum alloy circular tube of the embodiment has the height of 600mm, the diameter of 150mm and the wall thickness of 3 mm.

The CFRP cloth of the embodiment is a carbon fiber cloth woven by unidirectional continuous carbon fibers, the tensile strength of the carbon fiber cloth is 3667.5MPa, and the elastic modulus of the carbon fiber cloth is 240 GPa; the CFRP cloth is 300mm in width, and is cut and spliced into a specification of 520mm multiplied by 600 mm.

The manufacturing method of the aluminum alloy composite seawater concrete column internally adhered with the CFRP comprises the following steps:

(1) calculating the area of the inner wall according to the inner diameter of the aluminum alloy pipe, designing the transverse and longitudinal lap joint lengths according to GB50608-2020 fiber reinforced composite engineering application technical standard, and splicing the cut sections of CFRP cloth into complete CFRP cloth which can be wound on the inner wall of the aluminum alloy pipe for one circle;

(2) cleaning the inner wall of the aluminum alloy pipe by using alcohol, removing dust and attached impurities, keeping the inner wall of the aluminum alloy pipe clean, and ensuring that the CFRP is more firmly adhered;

(3) uniformly coating structural adhesive on the inner wall of the aluminum alloy pipe and two surfaces of the CFRP cloth, and winding the CFRP cloth on a steel pipe with the diameter smaller than the inner diameter of the aluminum alloy pipe, wherein the diameter of the steel pipe is about 1/5 of the inner diameter of the aluminum alloy pipe; the structural adhesive is carbon fiber impregnated adhesive HM-180C3P, and specifically comprises an adhesive A and an adhesive B of the carbon fiber impregnated adhesive HM-180C3P in a mass ratio of 2: 1 are mixed.

(4) As shown in fig. 2, placing the steel pipe wrapped with the CFRP cloth into the aluminum alloy pipe, aligning and fixing the CFRP cloth with two ends of the aluminum alloy pipe, placing a steel bar behind the steel pipe, slowly rotating the steel bar to drive the steel pipe to roll forward while separating the CFRP cloth from the steel pipe and adhering the CFRP cloth to the inner wall of the aluminum alloy pipe, after the CFRP cloth is adhered, rolling the steel bar for one circle around the inner wall of the aluminum alloy pipe again to discharge bubbles, ensuring that the CFRP cloth is tightly adhered to the inner wall, and obtaining the CFRP-aluminum alloy composite pipe;

(5) and after the structural adhesive is solidified, injecting seawater concrete into the CFRP-aluminum alloy composite pipe, and curing for 28 days to obtain the aluminum alloy composite seawater concrete column internally attached with the CFRP.

Example 2

The manufacturing method of the aluminum alloy composite seawater concrete column internally attached with the CFRP in the embodiment is the same as that in the embodiment 1, wherein the components of the seawater concrete are as follows: ordinary Portland cement with 42.5 cement strength grade of 480kg/m³530kg/m of sand³1200kg/m stone³190kg/m seawater³. The sand is sea sand, in particular medium sand with fineness modulus of 2.71; the stone is crushed stone with the particle size of 5-31 mm; the seawater concrete is prepared by uniformly stirring and mixing the components.

Example 3

The manufacturing method of the aluminum alloy composite seawater concrete column internally attached with the CFRP in the embodiment is the same as that in the embodiment 1, wherein the components of the seawater concrete are as follows: ordinary Portland cement with cement strength grade of 42.5 490kg/m³540kg/m of sand³1400kg/m stone³Sea water 210kg/m³. The sand is sea sand, in particular medium sand with fineness modulus of 2.71; the stone is crushed stone with the particle size of 5-31 mm; the seawater concrete is prepared by uniformly stirring and mixing the components.

Effect verification

In order to further illustrate that the aluminum alloy composite seawater concrete column internally attached with the CFRP has the characteristics of high bearing capacity and other mechanical properties, the aluminum alloy composite seawater concrete column internally attached with the CFRP prepared in the embodiment 1 is subjected to an axial compression test, and the axial compression test is carried out according to GB50936-2014 technical Specification for concrete filled Steel tube structures; meanwhile, other test groups are set (the number of layers to which the CFRP cloth is attached is changed on the basis of example 1), three batches of test pieces are made for each test group, an average value is obtained, and the recorded data are shown in table 1:

TABLE 1

Note: the concrete strength of the test pieces in table 1 is C40, the height H is 600mm, the outer diameter D is 150mm, and the wall thickness t is 3 mm; the test piece number in table 1 indicates: the CFAT is aluminum alloy pipe concrete, and then two serial numbers are connected, wherein the first serial number is the number of CFRP (carbon fiber reinforced plastics) cloth layers pasted on the inner wall of the aluminum alloy pipe, and the second serial number is the number of CFRP cloth layers pasted on the outer wall of the aluminum alloy pipe; for example, CFAT10 (example 1), in which-1-0 is a layer of CFRP cloth with 1 layer adhered to the inner wall and 0 layer adhered to the outer wall.

As can be seen from table 1, when the number of CFAT layers is increased as compared with CFAT00, the lifting of CFAT01 and CFAT10 to the load-carrying capacity is 18% and 23.4%, respectively, and the lifting of CFAT02 and CFAT11 is 28.7% and 35.7%, respectively; meanwhile, the axial pressure bearing capacity of CFAT10 is 4.5% higher than that of CFAT01, and the axial pressure bearing capacity of CFAT11 is 5.5% higher than that of CFAT 02. It can be seen that the bearing capacity of the aluminum alloy pipe with the CFRP cloth pasted on the inner wall is improved more obviously than that of the aluminum alloy pipe with the CFRP cloth pasted on the outer wall.

Because the elastic modulus of the aluminum alloy is only 1/3 of common carbon steel, the bearing capacity of the aluminum alloy with the same specification is only 67 percent of that of the carbon steel theoretically. Tests show that the axle load bearing capacity of the CFRP cloth-free concrete filled round steel tube with the specification of 400 multiplied by 131 multiplied by 3.5mm (height multiplied by diameter multiplied by wall thickness) is 1293kN, the axle load bearing capacity of the concrete filled round steel tube with 1 layer of CFRP cloth attached outside is 1348kN, and the axle load bearing capacity is converted into the ultimate stress of 95.9MPa and 100.1MPa for uniform dimensional variables; the limit stress of CFAT00 in the invention is 68.2MPa, which is only 70% of that of CFRP cloth-free concrete filled steel tube, while the limit stress of CFAT10 reaches 89.0MPa, under the condition that the weight of the aluminum alloy tube is obviously less than that of the steel tube, the limit stress of the member can reach 92.8% of that of the concrete filled steel tube only by adding a layer of CFRP cloth on the inner wall of the aluminum alloy tube, and the improvement effect is very obvious.

The invention also performs a seawater corrosion resistance test on the test piece, and the specific operation is as follows: a plastic water storage basin with the length, width and height of 143cm multiplied by 91cm multiplied by 37cm is filled with seawater with the height of 20cm, 5 test pieces are completely soaked in the seawater, the seawater is taken out after 180 days, and an axial pressure test is carried out, wherein the obtained data are shown in the following table 2, and the axial pressure bearing capacity is reduced by 3% to 7%.

TABLE 2

As can be seen from the comparison of the data in table 2, the test piece without CFRP cloth is most affected by corrosion, and in the CFRP test pieces with the same number of layers, no CFRP cloth is arranged outside the CFAT10 to block the external seawater, so that the area of contact with the seawater is larger than that of CFAT01, and the electrochemical corrosion by ions in the seawater is slightly more obvious than that of CFAT 01. But the aluminum alloy has good atmospheric corrosion resistance, and the surface corrosion degree is slightly more than that of the steel pipe. And because the internal CFRP enhances the axial pressure bearing capacity, the reduction range of the bearing capacity after the corrosion is still slightly lower than that of CFAT 01. The CFAT11 is internally and externally provided with CFRP cloth, the reduction range of the bearing capacity and the corrosion prevention effect are the best of those of the test pieces, but the CFRP cloth has higher cost, so that the consumption of the CFRP cloth is reduced under the condition that the structural mechanical property meets the general design requirement.

The invention also provides a control group during seawater corrosion resistance test, wherein the control group is a concrete column processed by replacing an aluminum alloy pipe with a steel pipe on the basis of the embodiment 1, and the strength of the steel pipe is Q345; the reduction rate of the axial pressure bearing capacity of the final control group was 8.8%.

Compared with high-strength steel pipes, the high-strength steel pipe has the advantages that the aluminum alloy pipe is selected, the weight is light, the transportation and the processing are convenient, the cost can be obviously reduced, the corrosion resistance is better, and the service life of the concrete column can be effectively prolonged.

As shown in fig. 3, the test piece of the aluminum alloy composite seawater concrete column with CFRP attached inside prepared in example 1 was subjected to fracture section splitting immediately after the axial compression test was completed. The result shows that although the CFRP cloth is attached to the inner wall of the aluminum alloy pipe before pouring, the CFRP cloth is basically debonded from the inner wall of the aluminum alloy pipe after the test is damaged; at the moment, the CFRP cloth is better adhered to the seawater concrete, the damaged and torn part is removed, and the rest part is still adhered to the seawater concrete; the CFRP cloth is finally debonded from the aluminum alloy pipe and still bonded with the concrete because the bonding force of the structural adhesive to the CFRP cloth is smaller than that of the concrete to the CFRP cloth; when the aluminum alloy pipe concrete is subjected to an axial compression test, the aluminum alloy pipe firstly bulges, so that gaps are formed between the internal concrete and the pipe wall to lose the outside pressure, then the concrete is crushed and damaged, and the CFRP cloth attached to the inside can delay the occurrence of concrete crushing and improve the structural ductility; the inner pasting CFRP cloth is more innovative and practical than the common outer pasting CFRP cloth.

In conclusion, the structure of the inner-pasted CFRP aluminum alloy composite seawater concrete column has the advantages of both aluminum alloy and CFRP, effectively improves the bearing capacity index and durability of the aluminum alloy pipe seawater concrete column, and prolongs the service life of the aluminum alloy circular pipe seawater concrete column.

Although the present invention has been described with respect to the preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.