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A kind of flexible fiber composite sheet for anti-seepage and reinforcement of concrete dam and preparation method thereof

A technology for concrete dams and composite sheets, applied in chemical instruments and methods, synthetic resin layered products, coatings, etc., can solve problems such as engineering danger, cost waste, reinforcement failure, etc.

Inactive Publication Date: 2020-07-07
CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When strengthening the dam under high water head, due to the high impact strength of the water head at the reinforcement position and the long-term humid or underwater environment, the simple carbon fiber reinforcement is very easy to cause reinforcement failure due to the failure of the adhesive layer, which brings potential Therefore, the present invention designs a flexible composite sheet with carbon fiber cloth as the main body, which has additional anti-seepage, wear-resistant and impact-resistant properties, and is specially used for the dam environment under high water head. concrete reinforcement

Method used

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  • A kind of flexible fiber composite sheet for anti-seepage and reinforcement of concrete dam and preparation method thereof
  • A kind of flexible fiber composite sheet for anti-seepage and reinforcement of concrete dam and preparation method thereof
  • A kind of flexible fiber composite sheet for anti-seepage and reinforcement of concrete dam and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] See Figure 1-2 , a flexible carbon fiber composite sheet for anti-seepage and reinforcement of concrete dams, its composition system is: flexible impregnated resin layers 1 and 3 for impregnation bonding, water resistance and anti-seepage, and carbon fiber cloth layers for load sharing 2 and the plastic plate layer 4, the specific structure is the first flexible impregnated resin layer 1, the carbon fiber cloth layer 2, the second flexible impregnated resin layer 3, and the plastic plate leveling layer 4 connected in sequence;

[0022] In order to achieve the reinforcement effect of general engineering, the first and second flexible impregnated resin layers 1 and 3 are made of SK series single-component polyurea resin produced by Beijing Zhongshui Kehaili Engineering Technology Co., Ltd. The specific properties are: Bond strength is 3.0MPa (test standard is CECS146-2003), tensile strength is 16MPa (test standard is GB / T 2568-1995), elongation is 350% (test standard is ...

Embodiment 2

[0053] The polyurea resin used in Example 2 and Example 1 is the same brand; the carbon fiber cloth layer 2 adopts the unidirectional carbon fiber cloth produced by Hummer Company, the model is HM-30, and the specific specification is: 300g / cm 2 , the tensile strength is 3700MPa, and the elongation is 2.0%. (Test standard: the test standard is CECS146-2003). The plastic plate leveling layer 4 adopts another model of Hengchuang brand GB plastic plate with a thickness of 0.60mm;

[0054] The specifications of the finally prepared composite sheet are: the sum of the thicknesses of the first flexible impregnated resin layer 1, the carbon fiber cloth layer 2 and the second flexible impregnated resin layer 3 is 5.00mm, and the plastic plate leveling layer 4 has a thickness of 0.60mm and an overall thickness of 5.60mm.

[0055] Effect test

[0056] Five groups of 300mm×300mm flexible carbon fiber composite panels for concrete reinforcement were prepared by the above preparation me...

Embodiment 3

[0065] The difference between Example 3 and Example 1 is that a self-healing material 5 is added to the impregnated resin layer, specifically, polyurethane / silica-coated hexamethylene diisocyanate [HDI@(PU / SiO 2 )] hybrid microcapsules, the microcapsules are added into the polyurea resin by stirring, and the addition amount is 10wt%.

[0066] Such as image 3 , the principle of self-healing is that the isocyanate repairing agent is coated in microcapsules and then embedded in the matrix. When the matrix resin cracks due to excessive stress, the microcapsules rupture and the isocyanate repairing agent flows out and penetrates into the cracks. Moisture in the air undergoes a moisture curing reaction to achieve self-repair. Since this repair mechanism does not require additional curing agents, it is easy to use and is especially suitable for dam or underwater repair.

[0067] The HDI@(PU / SiO 2 ) The concrete preparation method of microcapsule is:

[0068] (1) Weigh 1.5 parts...

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Abstract

The invention discloses a flexible carbon fiber composite sheet material for concrete dam seepage proofing and reinforcement, and a preparation method of the flexible carbon fiber composite sheet material. The flexible carbon fiber composite sheet material comprises a first flexible impregnating resin layer, a carbon fiber cloth layer, a second flexible impregnating resin layer and a plastic plateleveling layer which are sequentially distributed, the overall composite sheet material is small in thickness and high in flexibility, and belongs to a flexible plate material, and the flexible carbon fiber composite sheet material can be fully attached to a curved surface structure during seepage proofing and reinforcement. Arrangement of the plastic plate leveling layer is designed for the demands of dam seepage proofing and reinforcement under the effect of a high water head, and the plastic plate leveling layer is mainly used for leveling and seepage proofing, and is better closely combined with the concrete dam surface; and a flexible carbon fiber layer can adsorb impact energy under the high water head, cracking or damage of the impregnating resin layers is avoided, and meanwhile, flexible seepage proofing layers can be protected against being damaged by gravel and sharp impurities. The overall reinforcement sheet material is easy to prepare, low in cost and convenient to transport, and can meet the using needs of dam seepage proofing and reinforcement under the high water head.

Description

technical field [0001] The invention relates to the technical field of building reinforcement, in particular to a flexible carbon fiber composite sheet for anti-seepage and reinforcement of concrete dams. Background technique [0002] Concrete dam is a common dam type in hydraulic concrete buildings. After a certain service life or accidental impact, concrete dams may have cracks or other damages, resulting in performance degradation, and cannot meet the original design standards. Construction, demolition or reconstruction costs are too high, so repairing and strengthening them again is a common method in the construction field. [0003] The carbon fiber reinforcement method is a new method developed in recent years. The specific implementation process is to directly paste the carbon fiber board / carbon fiber two-dimensional woven fabric on the position to be reinforced through an efficient resin adhesive. After in-situ curing, the concrete stress can be shared to achieve rei...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02B3/16E02B7/00B32B9/00B32B27/32B32B33/00
CPCB32B5/02B32B27/32B32B33/00B32B2255/02B32B2255/10B32B2255/26B32B2262/106B32B2307/558B32B2307/7265B32B2307/762E02B3/16E02B7/00
Inventor 孙志恒徐耀李萌李蓉马宇董晓农韦昊南
Owner CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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