Deicing salt-resisting cement-based channel repairing agent

Abstract

The invention relates to the field of a repairing agents, and discloses a deicing salt-resisting cement-based channel repairing agent. The repairing agent is prepared fromconsists of the following components: potassium dihydrogen phosphate, magnesium oxide, borax, calcium carbonate, coal ash, silica fume, polyacrylamide, air entraining agent, awater reducing agent, fine aggregates, coarse aggregates and water. The invention also discloses a preparation method of the deicing salt-resisting cement-based channel repairing agent. The deicing salt-resisting cement-based channel repairing agent is short in time of coagulation, high in adhesive strength, excellent in anti-permeability and deicing salt corrosion resistance, and suitable for repairing road side channels, drainage channels and the like damaged by the stripping erosion of the deicing salt.

Description

technical field [0001] The invention relates to a cement-based repairing agent, in particular to a cement-based repairing agent for road side ditches and drainage ditches resistant to deicing salt corrosion. Background technique [0002] In winter in northern my country, the amount of snowfall is large and lasts for a long time. Under the action of vehicle load, the snow layer becomes compact and forms an ice layer, which affects the normal operation of traffic and leads to serious congestion of urban roads and expressways. In order to ensure smooth traffic and prevent accidents caused by road ice and snow, in addition to manual or mechanical deicing, sprinkling a large amount of deicing salt on the road is one of the most commonly used means of deicing. However, deicing salt also brings great damage to the road during the process of snow melting and deicing, causing serious erosion of concrete and corrosion of steel bars. The repair of this kind of corrosion damage has bec...

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Problems solved by technology

[0003] CN108069692 A provides a magnesium phosphate grouting material for rapid repair, the grouting material has adjustable setting time, high early strength and stable later strength without shrinkage, but does not have impermeability and deicing salt corrosion resistance; CN101386518A provides A fast-hardening and early-strength magnesium phosphate concrete is developed, which can be used for rapid repair of highways, airports, bridges, docks and other projects, as well as rapid curing and sealing of toxic and harmful substances, and can also be used for civil engineering projects under sulfate and seawater erosion, but It does not have impermeability and good bonding ability with damaged concrete interface; CN102863174A provides a cement concrete anticorrosion and rust inhibitor, which can improve the strength of concrete at various ages and chloride ion penetration resistance when mixed into concrete, and also It can give cement concrete a certain self-healing ability. It is easy to apply and convenient for mass concrete construction, but it does not have good bonding performance, and it emphasizes a cement concrete additive rather than a repair material. The component is silica fume , fly ash, slag powder, hydrotalcite, latex powder are main, and there is big difference with the component of the present invention; CN103570265A provides a kind of potassium magnesium phosphate cement-based concrete adhesive and preparation method thereof, and the concrete adhesive setting time of preparation can Controlled, high bond strength with ordinary Portland concrete components, high early strength and stable growth in later strength, and the process is simple and convenient to use, but it does not have salt corrosion resistance and impermeability, and it emphasizes a kind of Concrete adhesive instead of concrete repair material; patent CN105272138 A provides a magnesium phosphate cement-based rapid repair mortar and its preparation method, which has high early strength, bond strength and high water resistance, but does not have deicing resistance Salt corrosion performance; patent CN107555920A provides a salt corrosion-resistant concrete repair agent, which repairs the damaged surface of the concrete engineering damaged by deicing salt and seawater erosion, and improves the adhesion between the repaired body and the damaged surface of the concrete structure through various auxiliary materials. It has the ability of continuous defense and microstructure repair, and improves the bonding performance between the repair body and the damaged surface of the concrete structure, but its setting time is slow, which prolongs the repair time of the concrete structure, and it is mainly used, using sulfoaluminic acid The composite cementation system of salt cement and magnesium oxychloride cement is different from the phosphate cement base in the present invention

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