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A TRC-reinforced square column method for improving the bonding of fiber woven mesh and fine concrete

A technology of fine concrete and fiber woven mesh, which is used in building maintenance, solid waste management, sustainable waste treatment, etc., can solve the problems of reduced mesh performance, hard and brittle fiber mesh, and easily broken corners, and achieves simple construction. , the effect of improving adhesion and co-stressing ability

Active Publication Date: 2017-03-01
CHINA UNIV OF MINING & TECH
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0007] The above-mentioned prior art also has some deficiencies: it is very effective to use epoxy resin impregnation to improve the bonding strength between the fiber braided mesh and the fine concrete, but it should be noted that the fiber braided mesh will become hard and brittle after the epoxy resin is cured. It is easy to break; when using TRC to strengthen and repair concrete members, the use of fiber woven mesh impregnated with epoxy resin is generally more suitable for beams, slabs and other plane or curved surface reinforcement, and in four-sided reinforcement such as columns that need to improve the circumferential constraint After impregnated with epoxy resin, the fiber braided mesh becomes hard and brittle, especially at the corners, which leads to the use of fiber braided mesh for reinforcement and reduces the performance of the mesh, and the corners are the weak parts of reinforcement

Method used

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  • A TRC-reinforced square column method for improving the bonding of fiber woven mesh and fine concrete

Examples

Experimental program
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Effect test

Embodiment 1

[0039] as attached figure 1As shown, a reinforcement column 2 is reinforced by the method of the present invention, the cross-sectional size of the reinforcement column 2 is 200mm×200mm, and the height of the reinforcement column 2 is 800mm; c =19.1N / mm 2 , the reinforcement column 2 is equipped with 4 HRB400 longitudinal bars 1 with a diameter of 14mm, and the compressive design strength f y =360N / mm 2 , the thickness of the protective layer is 25mm, and the design value of the axial center of the reinforced column 2 is 900kN. Since the column needs to temporarily withstand the force exceeding the design load, under the action of the new load, the axial center pressure of the reinforced column 2 reaches 1600kN. 2 The structure is reinforced.

[0040] The reinforcement of this structure adopts the method of TRC reinforcement, and the fiber woven mesh adopts the weft carbon fiber (f f = 4900Mpa), woven by warp glass fibers, the mesh size of the fiber woven mesh is 10mm × 10...

Embodiment 2

[0049] A method of improving TRC reinforced columns of fiber woven mesh and fine concrete bonding, comprising the steps of:

[0050] 1) The surface of the member 2 to be reinforced is processed into uneven shapes, and chamfering is performed, and the chamfer is 30mm; the bonding ability between the surface of the member 2 to be reinforced and the TRC reinforcement layer is increased without edges and corners, and then the grease is removed. , dust and particles;

[0051] 2) Wet the member 2 to be reinforced with water, and spray the mixed fine concrete onto the surface of the member to be reinforced to form a surface layer of fine concrete with a thickness of 2-3 mm;

[0052] 3) After the fiber woven mesh is impregnated with polymer cement mortar, before the polymer cement mortar is solidified, it is laid on the surface of the surface fine concrete to form the first layer of fiber woven mesh 3; the weft and warp directions of the fiber woven mesh 3 are respectively It is carb...

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Abstract

The invention discloses a TRC square column reinforcing method for improving the fiber woven grid and fine concrete adhesive property, and relates to a reinforcing and repairing method for a concrete structure. The method specially comprises the steps that the surface of a column to be reinforced is machined to be uneven, and chamfering is carried out on the surface of the column to be reinforced; the surface of the column to be reinforced is wet by water, and the well-stirred fine concrete is ejected to the surface of the column; a fiber woven grid is immersed in polymer cement mortar, the fiber woven grid is laid on the surface of the fine concrete before the polymer cement mortar is solidified, and the radial fiber bundles are kept horizontal; fine concrete is ejected to the surface of the fiber woven grid, and the fine concrete is maintained by being wet by water to the age. During TRC column reinforcing, the polymer cement mortar is adopted to immerse the fiber woven grid, and therefore the fiber woven grid and fine concrete adhesive property can be effectively improved.

Description

technical field [0001] The invention belongs to the reinforcement and repair technology of concrete, and specifically refers to a method for strengthening the TRC square column by improving the bonding between fiber woven mesh and fine concrete. Background technique [0002] Fiber woven mesh reinforced concrete (Textile Reinforced Concrete, TRC for short) is a new type of fiber reinforced cement-based composite material, which can be used to reinforce and repair concrete components. It has the following advantages: ① TRC has good compatibility with the components to be reinforced, Because the matrix in TRC is also a cement-based material, the two materials are similar, and the cracks on the surface of the component can be filled when the component is repaired to reduce surface defects and cracks; ② The TRC reinforcement layer can be made very thin, which has a greater impact on the cross-sectional size of the original reinforced component. Small, because the diameter of the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E04G23/02C04B28/00C04B18/08C04B14/06
CPCY02W30/91
Inventor 尹世平杨扬李耀艾珊霞殷梦缇李鹏昊叶桃
Owner CHINA UNIV OF MINING & TECH
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