Description
Buy Sodium Formate (25 kg) from ChemLV at a bargain price in Latvia and the European Union
Intended use Sodium formate (25 kg) – Antifreeze additive in concrete | Antifreeze additive for building mixtures | De-icing additive | Leather pretanner |
Applied – Production of anti-icing mixtures | Concrete production | Leather work | Formic acid production | housing and communal services | Construction |
Description Sodium formate (25 kg)
Sodium formate (sodium formate) is a chemical compound with the formula HCOONa (HCO2Na). Sodium formate is a by-product obtained during the production of pentaerythritol. Technical sodium formate is sodium formate with a slight admixture of pentaerythritol and its derivatives. Sodium formate is most commonly used as a reducing agent in organic synthesis reactions. Technical sodium formate is used as an antifreeze additive in the production of concrete building structures, in the leather industry as an agent in pre-tanning technological operations, and also as a raw material in the production of formic acid and other chemical products. Sodium formate is highly soluble in water, poorly soluble in alcohols and insoluble in ethers.
At present, there is no independent technology for the production of sodium formate in industrial chemistry. The production of sodium formate is provided by an additional cycle of technological processing, as for a by-product in the production of pentaerythritol. Attempts to synthesize sodium formate have been carried out many times, but, despite this, so far they have not brought fruitful results. In addition, all the attempts made to synthesize sodium formate turned out to be very expensive, which ultimately affected the failure of the introduction of these methods into industrial production. Difficulties in the industrial production of sodium formate are associated with certain problems in the purification of the chemical compound. A slight admixture of pentaerythritol (C5H12O4) and its derivatives is always contained in the final composition of sodium formate.
Due to its properties, sodium formate is widely used in industry. Technical sodium formate is used as an antifreeze additive in the production of various concrete building structures. The normal temperature for hardening (setting) of concrete mortar is from +15 to +20 °C. When the temperature drops, the hardening of concrete and mortar slows down, and stops at 0 ° C and below, therefore, during winter concreting, special anti-frost additives are used, which allow concreting at temperatures down to minus 15 ° C.
Characteristics
Anti-frost additives (additives) are special chemical compounds that contribute to the hardening of concrete and mortar at negative temperatures down to minus 15 ° C by accelerating the hydration process of cement stone with the maximum involvement of available water. The main purpose of antifreeze additives:
- preserving the necessary mobility of the concrete mix;
- acceleration of the concrete hardening process;
- acceleration of the cement hydration process, since at sub-zero temperatures the hardening reaction is greatly slowed down.
As an antifreeze additive, sodium formate is used in the construction of monolithic concrete and reinforced concrete structures, monolithic parts of prefabricated monolithic structures and when monolithic joints of prefabricated structures, as well as in the construction of prefabricated concrete and reinforced concrete structures at landfills, at a steady average daily ambient temperature below +5 °С. One of the main advantages of sodium formate over traditional additives is its lower percentage of inclusion in the concrete solution. Sodium formate is introduced into the concrete mixture in the form of an aqueous solution with a concentration of 30-45%. In order to increase the dissolution rate of sodium formate, it is recommended to mix the solution with heated water up to a temperature of 40-70 °C.
The properties of sodium formate as an antifreeze additive in concrete ensure that work is carried out at negative temperatures, in frost, so that the concrete solution does not freeze during curing. Sodium formate ensures the preservation of the liquid phase of concrete at a negative temperature, which is necessary for effective hardening without freezing. This property of sodium formate helps to avoid additional heating of building materials, as well as subsequent heating of laid concrete at temperatures down to minus 15 °C. For more efficient mixing of the concrete solution, it is recommended to introduce sodium formate together with mixing water into the concrete mixer through a special chemical additive dispenser, while reducing the consumption of mixing water by 7-13%.
Features
Sodium formate accelerates the hardening of concrete, because it changes the solubility of the silicate components of cement and forms basic or double bonds with its hydration products salt. Since the crystallization of salts occurs with an increase in volume, their accumulation in separate zones of structures can lead to defects and destruction of these zones. Therefore, to reduce internal stresses in concrete and, since sodium formate does not have plasticizing and water-reducing properties, to increase the mobility of concrete mixtures and reduce the water/cement ratio, it is traditionally used in conjunction with superplasticizer C-3 powder or liquid. The consumption of superplasticizer C-3 in this case, regardless of temperature conditions, is 0.8-1.0% by dry matter of the mass of cement. Superplasticizer C-3 must also be diluted in water beforehand, it can be combined with sodium formate.
Concrete with sodium formate is allowed to be used if, during curing to acquire critical strength, the temperature of concrete with the maximum allowable dosage of the additive does not drop below minus 15 °C. The consumption of sodium formate in terms of dry matter is as follows:
- 2-3% by weight of cement, at an estimated curing temperature of up to minus 5 °C;
- 3-4% by weight of cement, at an estimated curing temperature of up to minus 10 °C;
- 4-6% by weight of cement at a design curing temperature down to minus 15 °C.
It is forbidden to use concrete with the addition of sodium formate in several cases:
- Structures, prestressed, reinforced with steel of classes At-IV, At-V, and A-V.
- In reinforced concrete and concrete structures and products. Which are intended for operation in gas and water environments with a relative humidity of more than 60%. If there are inclusions of reactive silica in the aggregate.
- In reinforced concrete products and structures of industrial enterprises, as well as for electrified vehicles consuming direct electric current.
