A method for strengthening concrete structures

A technology of concrete structure and carbon fiber cloth, which is applied in the field of concrete, can solve the problems of high price, poor wettability, and poor fire resistance, and achieve the effects of enhanced shear resistance and stress cycle resistance, increased mechanical bonding, and improved reinforcement effect

Inactive Publication Date: 2016-06-22
CHONGQING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, among the structural adhesives for bonding carbon fiber cloth, epoxy organic adhesives are widely used, but epoxy organic adhesives have two disadvantages: (1) Poor fire resistance, and the softening point of epoxy organic adhesives is very low. (2) Toxic, solvents or other volatile toxic substances added in the production process of epoxy organic adhesives will have adverse effects on the human body and the environment
However, the setting time of magnesium phosphate cement is short, and the slurry has condensed before completely infiltrating the fiber monofilament, so pestle and pressure treatment are not suitable for use in magnesium phosphate cement bonded carbon fiber cloth.
[0014] In addition, nano-sized magnesium dioxide particles are finer, can enter between carbon fiber monofilaments, and can also be used to improve the problem of poor wettability of magnesium phosphate cement to carbon fiber cloth, but nano-sized magnesium dioxide is expensive, which will greatly increase construction costs, so The use of nano-sized magnesium oxide to improve the wettability of magnesium phosphate cement to carbon fiber cloth is only in the laboratory research stage

Method used

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  • A method for strengthening concrete structures

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Effect test

Embodiment （ 1

[0035] A carbon fiber cloth pretreatment method for concrete reinforcement, comprising the following steps:

[0036] (1) For treatment with anhydrous ethanol solution, soak the carbon fiber cloth with an anhydrous ethanol solution with a concentration of more than 99% for more than 24 hours; when soaking, the entire container should be sealed to prevent moisture in the air from entering the anhydrous ethanol and reduce the concentration of anhydrous ethanol , to ensure the soaking treatment effect;

[0037] (2) Alkaline solution treatment, prepare 40g / L sodium hydroxide solution, soak the carbon fiber cloth treated with absolute ethanol in the sodium hydroxide solution for more than 4 hours; this can effectively remove the organic matter and impurities on the surface of the carbon fiber cloth, and avoid It affects the follow-up reaction without damaging the carbon fiber cloth itself;

[0038] (3) Phosphate solution treatment, prepare a saturated ammonium dihydrogen phosphate ...

Embodiment （ 2

[0041] Embodiment (2) This specific embodiment is different from the specific embodiment (1) only in the soaked phosphate solution, and the rest are the same. The saturated phosphate solution in this specific embodiment is a saturated potassium dihydrogen phosphate solution with a concentration of 22.6 g / L.

Embodiment （ 3

[0042] Embodiment (3) This specific embodiment is different from the specific embodiment (1) only in the soaked phosphate solution, and the rest are the same. The saturated phosphate solution in this specific embodiment is a saturated sodium dihydrogen phosphate solution with a concentration of 86.9 g / L.

[0043] In order to further prove that the carbon fiber cloth obtained by the above pretreatment method can well generate magnesium ammonium phosphate hexahydrate between the fiber filaments inside the carbon fiber cloth, and improve the bonding strength between the carbon fiber cloth and the magnesium phosphate cement. The applicant used the distribution of carbon fiber cloth pretreated by the above three phosphate solutions and compounded it with magnesium phosphate cement made in the laboratory, and formed a 40mm×40mm×160mm test piece for testing. The size of the carbon fiber cloth was 40mm×160mm, and the carbon fiber cloth was arranged in The distance between the test pie...

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Abstract

The invention discloses a method for reinforcing concrete structures, which is implemented by taking magnesium phosphate cement as a structure adhesive through bonding a layer of carbon fibers on the surface of a concrete structure, so that an effect of reinforcing is achieved. The method is characterized in that the carbon fibers before being bonded on the concrete structure are pretreated, so that a hydration product-ammonium magnesium phosphate hexahydrate with a cementation effect is generated among cellosilks in the carbon fibers. The method disclosed by the invention has the advantages of simplicity in operation, good pretreatment effect, and capability of improving the wettability of the magnesium phosphate cement to fiber cloth, increasing the bonding strength between the magnesium phosphate cement and the carbon fiber cloth, and enhancing the effect of concrete structure reinforcement, and the like.

Description

technical field [0001] The invention relates to the technical field of concrete; in particular, it relates to a concrete structure reinforcement method. Background technique [0002] Concrete structure refers to the building structure obtained by using concrete as raw material. In order to improve the strength of concrete structure, carbon fiber cloth is often used in concrete structure for reinforcement to improve the tensile, shear and seismic reinforcement of concrete structural members. The principle of carbon fiber cloth reinforcement is: use high-performance structural adhesives to bond to the surface of concrete components, and coordinate with the structural adhesives to form a complete carbon fiber cloth sheet reinforcement system with excellent performance. Using the good tensile properties of carbon fiber materials to achieve The purpose of enhancing the load-carrying capacity of structural members. [0003] At present, among the structural adhesives for bonding c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B41/00
Inventor 贾兴文杨再富冉少念吴洲樊先平尤超石从黎孙莉辛转红
Owner CHONGQING UNIV
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