A kind of anti-salt freeze self-repairing cement concrete and preparation method thereof

Abstract

The invention belongs to the field of building materials, and particularly relates to anti-salt-freezing self-repairing cement concrete and a preparation method thereof. The anti-salt-freezing self-repairing cement concrete is prepared from cement, coal ash, coarse aggregate, fine aggregate, water, temperature-sensitive hydrogel, disodium maleate, calcium bicarbonate, metakaolin and water reducer.According to the anti-salt-freezing self-repairing cement concrete and the preparation method thereof, the temperature-sensitive hydrogel is used for absorbing salty water permeating into the concrete at a low temperature, and thus salt-freezing damage to the concrete can be effectively prevented; disodium maleate and calcium bicarbonate are used for repairing microcracks in the concrete after freezing-thawing damage, and metakaolin is adopted for increasing the internal compactness of the concrete and improving the freezing resistance of the concrete. The anti-salt-freezing self-repairing cement concrete has excellent salt-freezing resistance, and the service life of the concrete in cold regions can be significantly prolonged.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a salt-freeze-resistant self-repairing cement concrete and a preparation method thereof. Background technique [0002] Cement concrete has been widely used as an important building material. However, cement concrete is a porous and brittle material, and its structure is easily damaged under the action of freeze-thaw cycles, resulting in internal damage and microcracks, which not only reduce the strength, but also accelerate erosion and damage. About 60% of the roads and municipal roads in my country have snow and ice in winter. In order to prevent the impact of ice and snow on traffic, chlorine salt deicing agents are often used to eliminate road ice and snow, which also leads to salt damage to concrete. Because the salt water melted by the deicing agent penetrates into the cement concrete, it will aggravate the internal damage and microcracks of the concrete under ...

AI Technical Summary

Problems solved by technology

Since the concrete itself has a porous structure, although these methods can alleviate the damage to concrete caused by salt freezing to a certain extent, they cannot really solve the problem of concrete salt freezing damage.