Application of Surface Restoration Technology to Improve the Impact Strength of Concrete

Abstract

The invention belongs to the technical field of concrete structure reinforcement, and relates to a method for improving impact strength of concrete by a surface repairing technique. The method is characterized in that polyacrylonitrile short fibers and a modified epoxy resin adhesive are utilized, and the surface of a concrete structure is repaired by coating of the adhesive for multiple layers, laying of the short fibers, and other processes, so as to achieve the effect of improving the impact strength of the concrete structure. The technique has the advantages that processes are simple and convenient, the operation is easy, impact resistance of the concrete structure is improved obviously, and excellent reinforcement effect and good stability are achieved, thereby achieving better application prospects.

Description

technical field [0001] The invention belongs to the technical field of concrete structure reinforcement. In particular, it relates to a concrete structure reinforcement technical method with high strength, high stability, simple and fast process, and mechanized operation. Compared with the conventional concrete structure strengthening technology, this method has the advantages of high efficiency, high strength and high stability, which meets the requirements of the marketization of concrete structure strengthening, and has broad application prospects. Background technique [0002] At present, there are many technologies and related specifications on the reinforcement of concrete structures, and the reinforcement projects are also relatively extensive. The reinforcement methods generally include: 1) Enlarging section reinforcement method; 2) Replacement concrete method; 3) External prestress reinforcement method; 4) Paste fiber composite reinforcement method; 5) Paste steel ...

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Problems solved by technology

[0004] 1) Easy to peel off and damage: the end of the sticker is easy to warp or the performance of the adhesive is unstable, and the overall performance becomes poor in a harsh environment, which is easy to cause peeling and damage of the sticker;

[0005] 2) The cost of reinforcement materials is high: the cost of fiber cloth, fiberboard and steel plate is higher than the price of short fiber;

[0006] 3) The construction process is complex: in the reinforcement method of pasting fiber composite materials and the method of pasting steel plates, the cutting and production of fiber composite materials and steel plates are relatively complicated, and the dead corners of the structure are difficult to deal with; the cross-section reinforcement method, the external prestress reinforcement method and the addition of fulcrums The construction steps of the reinforcement method are cumbersome, the construction operation level is relatively high, and the reinforcement quality is difficult to guarantee;

[0007] 4) The applicability of the concrete structure is reduced: the appearance of the structure is changed to varying degrees due to the pasting of fiber cloth or steel plates on the surface, as well as the increase of the cross-section and the addition of fulcrums, and the apparent effect of reinforcement is poor, which reduces the applicability of the structure

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