Admixtures that are not allowed to be added in the concrete mix proportion design are: admixtures that are not allowed to be added according to relevant national regulations. Basis: Technical specification for application of concrete admixtures GB 50119-2013;
3.1.3 Contains hexavalent chromium salts, nitrites and thiocyanates Concrete admixtures are strictly prohibited from being used in concrete that is in direct contact with drinking water after completion in drinking water projects.
3.1.4 Early-strength ordinary water-reducing agents, early-strength agents, antifreezes and waterproofing agents containing strong electrolyte inorganic salts are strictly prohibited from being used in the following applications: Concrete structure:
1 Concrete structure in contact with galvanized steel or aluminum iron;
2 Concrete structures with exposed steel bars and embedded iron parts without protective measures;
3 Concrete structures using DC power supply;
4 Concrete structures within 100m of high-voltage DC power supply.
3.1.5 Early-strength ordinary water-reducing agents, early-strength agents, waterproofing agents and chloride salt antifreeze containing chlorine salts are strictly prohibited. Prestressed concrete, reinforced concrete and steel fiber concrete structures.
3.1.6 Early-strength ordinary water-reducing admixtures and early-strength agents containing ammonium nitrate and ammonium carbonate, and early-strength admixtures containing ammonium nitrate, ammonium carbonate, and urea Antifreeze is strictly prohibited to be used in office, residential and other construction projects with human activities.
3.1.7 Early-strength ordinary water-reducing agents, early-strength agents, antifreezes and nitrite-containing nitrites Rust inhibitors are strictly prohibited to be used in prestressed concrete structures.
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