Underwater repairing coating material for concrete structure

Abstract

The invention discloses an underwater repair coating material for a concrete structure, and belongs-the technical field of coatings. The coating material comprises 25-45 wt% of tetrafunctional epoxy resin, 3-8 wt% of auxiliary agents, 0.3-2 wt% of short fibers, 40-65 wt% of a powder filler, 4-15 wt% of a curing agent and 0-12 wt% of a reactive diluent; the sum of the percentages of the above raw materials is 100 wt%; the auxiliary agents comprise a leveling agent, a water reducer and a plasticizer; the short fibers are basalt fibers; the powder filler is a combination of river sands, cement and silicon powder; the curing agent is modified epoxy resin containing an imidazoline structure; and the reactive diluent is trimethylolpropane triglycidyl ether. The underwater repairing coating material can meet underwater wet construction, can be rapidly cured underwater, and has the main advantages of excellent dispersion resistance, excellent fluidity, excellent compressive strength, good bonding strength with old concrete, and good mechanical strength. No organic solvents or heavy metals are added, so that the coating material is safe, environment-friendly and sanitary.

Description

technical field [0001] The invention relates to the technical field of coatings, in particular to an underwater repair coating material for concrete structures and a preparation method thereof. Background technique [0002] In recent decades, there have been more and more accidents at home and abroad where underwater concrete structures have been damaged due to erosion due to their poor durability, which in turn affects their life. Most of the aging hydropower stations are facing problems such as cracking, erosion, spalling and seepage of underwater structures such as bottom plates, stilling basins, aprons, and dam surfaces, which seriously threaten the safe operation of the dam and urgently need to be repaired. Abroad, many countries are facing structural deterioration and destruction of a large number of reinforced concrete structures, resulting in various engineering problems, and this situation is still intensifying and far exceeding expectations. In China, the National...

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Problems solved by technology

For example, the Chinese patent application with the application number 201510549685X and the invention name "An Epoxy Resin Emulsion Modified Cement-Based Repair Material and Its Preparation Method" discloses an epoxy resin emulsion repair material. The Chinese patent application titled "A High-Density Underwater Epoxy Repair Adhesive and Its Preparation Method and Application" discloses a repair material containing bisphenol A epoxy resin and low-viscosity aminophenol-based trifunctional epoxy resin , the current repair coating materials, in the underwater construction environment, the dispersion resistance and fluidity of the repair materials are difficult to balance, and there are generally poor underwater construction performance, low bond strength, poor mechanical properties, and poor durability. Ideal and other problems, the current underwater repair materials on the market often cannot achieve long-term repair of underwater damaged parts of concrete structures

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