Dam concrete surface abrasion-resistant coating and coating method thereof

Abstract

The invention provides dam concrete surface abrasion-resistant coating and a coating method of the dam concrete surface abrasion-resistant coating. The coating is composed of three layers of coating namely a bottom layer, a middle layer and a surface layer from the surface of concrete outwards, wherein the coating at the bottom layer is epoxy cement gum with the thickness of 1-3 mm, the coating at the middle layer is low-viscosity epoxy resin adhesive with the thickness of 0.1-0.5 mm, the coating at the surface layer is polyaspartic acid ester polyurea which is 0.3-0.5 mm thick and is modified from nanometer materials, and the viscosity of the low-viscosity epoxy resin adhesive is 50-200 mPa.s. The dam concrete surface abrasion-resistant coating is resistant against the abrasion and damage of high-speed silt carrying water flow and bed load, effectively protects a dam to run normally, prolongs the safe service life of the dam, and protects the surface of dam concrete from fading or being pulverized and falling off. Meanwhile, the dam concrete surface abrasion-resistant coating is economical and practical, has good abrasion-resistant performance, adaptability and weather resistance, thereby meeting the requirements for abrasion-resistance of the surface of the dam concrete.

Description

technical field [0001] The invention belongs to the field of concrete surface coatings, in particular to a scour-resistant coating on the surface of dam concrete and a brushing method thereof. Background technique [0002] With the development of water conservancy and hydropower projects, there are more and more high-head and large-flow discharge structures. Hydraulic discharge structures such as dam spillways, stilling basins, flood discharge tunnels, lock chamber floors and water delivery structures of navigable structures Concrete surfaces such as corridors and sand discharge bottom holes are often subjected to high-speed sandy water flow and moving mass erosion and abrasion (referred to as abrasion), which not only directly or indirectly affects the safety of the project, but also causes huge dam maintenance costs. According to statistics, nearly 70% of the large and medium-sized hydropower projects that have been built have erosion and abrasion damage. [0003] In orde...

AI Technical Summary

Problems solved by technology

High-strength grade anti-abrasion concrete has a large amount of cement and high calorific value, which is prone to dry shrinkage cracks and temperature cracks, and the amount of repair work is large, and there are many unstable factors after repair.

In terms of application technology research on organic composite materials as concrete surface coatings, in the past, most of them focused on organic material mortars, such as epoxy mortars, but their weather resistance is poor, and they are prone to aging or even pulverization damage when exposed to the natural environment for a long time.

In the case of large environmental and climate changes, the organic mortar is prone to cracking, warping and delamination when the hydraulic structure is discharged with high-frequency vibration, and the construction is inconvenient and the adaptability is poor

Polyurea is one of a new type of environmentally friendly and abrasion-resistant organic coatings developed in recent years. It has excellent weather resistance and can resist sunlight without aging, but its price is relatively high, and one of its main components The isocyanate group is easy to react with the moisture in the wet base surface to cause foaming, and the performance is significantly reduced, resulting in poor adaptability

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