High-performance structural adhesive as well as preparation method and construction method thereof

Abstract

The invention discloses a high-performance structural adhesive as well as a preparation method and a construction method thereof. The preparation method comprises the following steps of: mixing and stirring 100 parts of E-44 epoxy resin, 5-30 parts of a mixed solution of potassium silicate and sodium silicate, 20-180 parts of silica powder, 5-30 parts of nano calcium carbonate and 1-4 parts of micron carbon fibers to prepare a mixture A; mixing and stirring 20 parts of polyamide, 30 parts of aromatic amine, 20-60 parts of silica powder, and 1-2 parts of micron carbon fibers to obtain a mixtureB; selecting the mixture A and the mixture B according to the mass ratio of 2: 1, mixing and stirring the selected mixture A and mixture B, and putting an obtained mixture into a closed container soas to subject the mixture to vacuum-pumping and bubble-removing treatment to obtain the high-performance structural adhesive. The high-performance structural adhesive has the advantages of high bonding strength, good weather resistance and durability, few bubbles, excellent waterproof and anti-corrosion effects, high liquidity, environmental friendliness, convenience in construction and the like,has good market prospects and is suitable for popularization.

Description

Technical field [0001] The invention relates to the technical field of bridge structural adhesives, in particular to a high-performance structural adhesive and a preparation method and construction method thereof. Background technique [0002] Bridges are the key nodes of the transportation network and play a vital role in ensuring the efficient operation of transportation. Concrete bridges occupy an important position and a considerable proportion of bridges in our country. During the operation period of the concrete bridge, under the action of load and external environment and other factors, the bridge will appear diseases. The typical and common one is cracks, which will not only change the stress distribution of the structure, but also cause external corrosion factors to enter the bridge structure. Internal, aggravate the deterioration of materials, threatening the safety and durability of the bridge. According to the causes and development of cracks, treatment methods main...

AI Technical Summary

Problems solved by technology

[0003] For structural adhesives used as a connecting agent between the reinforcement material and the reinforced structure, there are mainly the following problems: (1) The mechanical properties of structural adhesives are not high, especially the bonding performance

According to the actual engineering research, in the current strengthening methods such as pasting carbon fiber cloth, pasting carbon fiber plate, pasting prestressed carbon fiber plate and pasting steel plate, before the mechanical properties of the reinforced material are fully exerted, the reinforcement system is due to the failure of the structural adhesive. damage, resulting in a great waste of reinforcement material strength

(2) The weather resistance and durability of structural adhesives are not high

According to the actual engineering research, in the pasting method of structural adhesive reinforcement projects, due to static and dynamic loads and external environmental factors, the service life and performance of structural adhesives are far from the designed service life, resulting in early maintenance of the reinforcement system and replacement, the construction is troublesome, the cost is high, and the impact on the structure is relatively large

(3) There are many air bubbles in the structural adhesive, and it is not easy to discharge

Bubbles in the structural adhesive will reduce the mechanical properties and durability of the structural adhesive, weaken the reinforcement effect, provide a channel for external corrosive environmental factors to enter the structure, and threaten the safety and durability of the structure

(4) The waterproof and anti-corrosion performance of the structural adhesive is weak, and it cannot provide effective protection for the steel bars inside the structure

Since the working environment of the structural adhesive is usually in the wild, it is greatly affected by external factors such as ultraviolet rays, rain and snow. The weak waterproof and anti-corrosion performance of the structural adhesive will cause the performance of the structural adhesive to degrade or even fail, and at least affect the durability of the reinforced structure and the reinforced system. security, and seriously threaten the security of the structure

(5) The fluidity of the structural adhesive is poor, and the on-site configuration and construction of the structural adhesive are troublesome

At present, the production of structural adhesives commonly used in the market needs to go through multiple technological processes, which consumes high time, material, labor and material costs.

The poor fluidity of structural adhesives also increases the difficulty of making and constructing structural adhesives

[0004] For structural adhesives used as sealing materials, there are mainly the following problems: (1) The mechanical properties of structural adhesives are not high, especially the bonding properties

(2) The weather resistance and durability of structural adhesives are not high

According to the actual engineering research, in the reinforcement project using structural adhesive as the sealing material, due to the effect of static and dynamic loads and the influence of external environmental factors, the service life and performance of the structural adhesive are far from the designed service life, resulting in the advance of the reinforcement system. Maintenance and replacement, troublesome construction, high cost, and relatively large impact on the structure

In structures where structural adhesives are often used as sealing materials, the closed parts often crack again shortly after reinforcement, causing external corrosion factors to enter the structure, threatening the safety and durability of the structure

(3) There are many air bubbles in the structural adhesive, and it is not easy to discharge

Bubbles in the structural adhesive will reduce the mechanical properties and durability of the structural adhesive, weaken the reinforcement effect, provide a channel for external corrosive environmental factors to enter the structure, and threaten the safety and durability of the structure

(4) The waterproof and anti-corrosion performance of the structural adhesive is weak, and it cannot provide effective protection for the steel bars inside the structure

Since the working environment of the structural adhesive is usually in the wild, it is greatly affected by external factors such as ultraviolet rays, rain and snow. The weak waterproof and anti-corrosion performance of the structural adhesive will cause the performance of the structural adhesive to degrade or even fail, and at least affect the durability of the reinforced structure and the reinforced system. security, and seriously threaten the security of the structure

(5) The fluidity of the structural adhesive is poor, and the on-site configuration and construction of the structural adhesive are troublesome

At present, the production of structural adhesives commonly used in the market needs to go through multiple technological processes, which consumes high time, material, labor and material costs.

The poor fluidity of the structural adhesive will lead to incomplete sealing of micro cracks, which will affect the reinforcement effect and increase the difficulty of the production and construction of the structural adhesive