Precautions when using concrete antifreeze

(1) Chloride salt antifreeze:

Use chlorine salt (calcium chloride, sodium chloride ) is used as an antifreeze component and can be used in unreinforced concrete projects.

(2) Chlorine salt rust-inhibiting antifreeze:

Use chlorine salt and anti-rust agent Antifreeze containing rust agent (sodium nitrite, etc.) as antifreeze component can be used in reinforced concrete projects, but it cannot be used in reinforced concrete of the following structures.

1) Structures used in environments with relative humidity greater than 80%, structures in areas where the water level rises and falls, open-air structures or structures that are often exposed to water.

2) Structures in contact with galvanized steel or aluminum iron, as well as structures with exposed embedded iron parts without protective measures.

3) Structures in contact with corrosive media containing acid, alkali or sulfuric acid.

4) Structures that are often exposed to ambient temperatures above 60°C.

5) Structures using cold-drawn steel bars or cold-drawn low-carbon steel wire reinforcements.

6) Thin-walled structures of water supply and drainage structures, crane beams, roof trusses, drop hammer or forging hammer foundations of intermediate and heavy-duty working cranes and other structures.

7) Electrolytic workshops and structures within 100m of high-voltage DC power supply.

8) Structures close to high-voltage power sources, such as power stations and substations.

9) Prestressed concrete structure.

10) Concrete structure containing active aggregates.

(3) Chlorine-free salt antifreeze is an antifreeze that uses non-chlorine salt materials as antifreeze components. It can be used in reinforced concrete projects and prestressed concrete. project. However, antifreeze containing the following antifreeze component materials shall not be used in the following structures.

1) Nitrate, nitrite and carbonate admixtures shall not be used in prestressed concrete projects, galvanized steel or parts in contact with aluminum and iron reinforced concrete structure.

2) Contains toxic antifreezes such as hexavalent chromium salts and nitrites. It is strictly prohibited to be used in drinking water projects and food contact parts.