Recommendations for the use of sodium formate as antifreeze additive in concrete and mortar
Sodium formate — antifreeze agent, antifreezing liquid phase concrete (mortar).
FN supplement recommended for the construction of monolithic concrete and reinforced concrete structures, embedment of joints of prefabricated structures, as well as added to the solution in the winter with temperatures below zero.
The amount of additive is assigned depending on the design temperature hardening.
Dosage and method of administration
Sodium formate (dry) is introduced into the concrete (mortar) mixture in the amount of:
- 2% by weight of cement at the design temperature hardening to -5 °C;
- 4% by weight of cement at the design temperature hardening -10 °C.
One of the advantages of BM is a lower percentage of entering into the concrete (solution) compared with other conventional additives.
FN is introduced into the concrete mixture in the form of an aqueous solution of working concentration of 30–45%. To increase the rate of dissolution is recommended to heat the water up to 40-700 °C and the solution.
Concrete with the addition of sodium formate is prohibited to use:
- in the pre-stressed structures, steel-reinforced grades Am-IV, Al-V, Al-VI, A-IV, A-V;
- in concrete and reinforced concrete structures and articles intended for use in aqueous and gaseous environments with a relative humidity of over 60% in the presence of inclusions in the core of reactive silica;
- in reinforced concrete constructions and products for electric transport and industries that consume a constant electric current.
