The difference between calcium formate and sodium sulphate
Recently, due to the decrease of temperature, the use of cement mortar early strength agent has increased. Chongqing Chuandong Chemical has also received many inquiries about how to identify the true and false calcium formate and its purity, which is a simple and quick method. Calcium formate is very likely to be adulterated with sodium formate powder. Both calcium formate and sodium formate powder can play an important role in anti freezing and early strengthening in construction. However, the amount of calcium formate added in mortar is far less than that of sodium formate powder, but the effect is stronger than that of sodium formate powder, and the price of sodium formate powder is far lower than that of calcium formate. In order to avoid the loss of use caused by the user buying adulterated calcium formate, we share it with you today. The difference and distinguishing method of powder.
Calcium formate is a kind of white to light yellow crystal powder which can flow freely and has slight smell. It is a kind of cement early strength agent with low cost. It plays the role of fast coagulant, lubricant and early strength agent in the field of cement. In construction mortar and various cement concrete, calcium formate can greatly accelerate the hardening speed of cement and shorten the setting time, especially in winter construction. It can avoid setting too slowly and demoulding quickly at low temperature, so as to improve the strength of cement as early as possible; according to the data provided by users, the amount of calcium formate added is about 0.5-1.0% per ton of dry mortar and concrete, and the maximum amount is 2.5%. In summer, the amount of calcium formate is usually 0.3% - 0.7% of cement, and the amount of calcium formate added increases with the decrease of temperature.
Sodium sulphate is also colorless, transparent and crystal like. It can also play a role of early strength and antifreeze in construction. However, the content of sodium sulphate is generally 0.5% - 2% of the quality of cement, which can improve the early strength of concrete by 50% - 100%. In 28 days, the strength sometimes increases, sometimes decreases, and the increase range is about 10%. Sodium sulphate has water absorption, which can quickly absorb the water in cement. The moisture can accelerate the drying of mortar and play the role of antifreeze, but the bleeding is relatively serious (the formic acid in calcium formate belongs to weak acid, and there is hydrolysis process in the aqueous solution, so the aqueous solution of calcium formate should be weak alkaline, which plays an early and strong role in the reinforced concrete, the effect of initial setting, and there is no bleeding phenomenon), so it must be used appropriately.
Calcium formate is a kind of white to light yellow crystal powder which can flow freely and has slight smell. It is a kind of cement early strength agent with low cost. It plays the role of fast coagulant, lubricant and early strength agent in the field of cement. In construction mortar and various cement concrete, calcium formate can greatly accelerate the hardening speed of cement and shorten the setting time, especially in winter construction. It can avoid setting too slowly and demoulding quickly at low temperature, so as to improve the strength of cement as early as possible; according to the data provided by users, the amount of calcium formate added is about 0.5-1.0% per ton of dry mortar and concrete, and the maximum amount is 2.5%. In summer, the amount of calcium formate is usually 0.3% - 0.7% of cement, and the amount of calcium formate added increases with the decrease of temperature.
Sodium sulphate is also colorless, transparent and crystal like. It can also play a role of early strength and antifreeze in construction. However, the content of sodium sulphate is generally 0.5% - 2% of the quality of cement, which can improve the early strength of concrete by 50% - 100%. In 28 days, the strength sometimes increases, sometimes decreases, and the increase range is about 10%. Sodium sulphate has water absorption, which can quickly absorb the water in cement. The moisture can accelerate the drying of mortar and play the role of antifreeze, but the bleeding is relatively serious (the formic acid in calcium formate belongs to weak acid, and there is hydrolysis process in the aqueous solution, so the aqueous solution of calcium formate should be weak alkaline, which plays an early and strong role in the reinforced concrete, the effect of initial setting, and there is no bleeding phenomenon), so it must be used appropriately.
The specific and detailed identification method can be dissolved by experimental heating, and about 15g of water can be melted into 100ml of water and heated. The solution is not colorless and transparent, it should not be pure.
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