Dam concrete anti-ageing method

Abstract

Disclosed is a dam concrete anti-ageing method. A polyurethane foam layer is coated on the surface of a concrete dam, after a dam heat-insulation and moisturizing layer is obtained, a polymer mortar layer is further covered on the concrete dam, and a dam heat-insulation moisturizing layer protecting layer is obtained; a layer of alkali-resistant fiberglass gridding cloth or an iron wire screen which is fixed by heat-insulation anchor bolts is laid outside the dam heat-insulation moisturizing layer protecting layer, another polymer mortar layer is covered on the alkali-resistant fiberglass gridding cloth or the iron wire screen, so that a protecting surface layer is obtained, and anti-ageing construction of a dam body is completed. In the technical scheme, the dam body is constructed, abilities including freezing and thawing resistance, leakage resistance, carbonized flow scouring resistance, abrasion resistance, cavitation resistance, durability, pressure resistance, crack resistance and impermeability of the dam body can be strengthened by the obtained protecting layer, and the protecting layer has the advantages that the protecting layer is attractive in appearance and fine in heat insulation and moisturizing performances, and does not pollute environments. The heat insulation and moisturizing performances are stable, and cannot be changed greatly along with weather change, and concrete cracks and concrete ageing due to change of weather conditions can be effectively controlled.

Description

Technical field [0001] The invention belongs to the technical field of water conservancy and hydropower dam concrete protection, and in particular relates to an anti-aging method for dam concrete. Background technique [0002] Concrete dams are huge in size, and surface cracking and aging of the dam body are a common phenomenon in actual engineering. In addition to temperature and humidity changes, the autogenous volume shrinkage of concrete and other related shrinkage and deformation will cause cracking and aging of dam concrete, such as freezing and thawing, leakage, carbonized flow erosion, wear, and gas. Corrosion, alkali-aggregate reaction and other factors work together. [0003] In terms of preventing dam aging and cracking, there is also a technical solution that sprays a polyurethane layer on the dam body to keep it warm and moisturizing. Practice has proved that this solution ignores a problem, that is, polyurethane polymer materials are very easy to age under light. Di...

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Problems solved by technology

[0003] In terms of preventing aging and cracking of the dam, there is also a technical scheme of spraying a polyurethane layer on the dam body to keep warm and keep moisture. It has been proved by practice that this scheme ignores a problem, that is, polyurethane polymer materials are very easy to age under light. Discoloration, even cracking, curling, and partial shedding are more serious

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