Are you sure you really know the effect of sodium gluconate? Its role in concrete is: water reducer and retarder. What will be the effect?
Sodium gluconate is generally used alone, but it can also be used in combination with other retarders such as carbohydrates and phosphates. Sodium gluconate produced under specific conditions is a crystalline powder. The compound is chemically pure and non corrosive. The mass is constant. These characteristics can ensure that it has reliable and repeatable results in application.
Detailed below effect does sodium gluconate have .
Sodium gluconate as water reducer
Adding sodium gluconate to reduce the water-cement ratio can achieve the following effects:
- Improve workability. Under the condition of constant water cement ratio (w / C), the addition of sodium gluconate can improve the workability. At this time, sodium gluconate acts as a plasticizer. When the dosage of sodium gluconate is less than 0.1%, the degree of improving workability is directly proportional to the dosage.
- Increase strength. Keeping the cement content unchanged can reduce the water content in concrete. Using 0.1% sodium gluconate can reduce the amount of water added by 10%.
- Reduce cement content. The content of water and cement decreased in the same proportion, and the w / C ratio remained unchanged.
Sodium gluconate as retarder
Sodium gluconate can significantly delay the setting time of concrete.When the dosage is less than 0.15%, the logarithm of initial setting time is in positive proportion to the dosage;If the dosage is doubled, the initial setting time will be delayed to ten times.Working hours can be extended from a few hours to a few days without affecting the intensity. This is an important advantage, especially in hot weather and long-term storage.
Used as a special cleaning agent for glass bottles
The cleaning of hundreds of millions of glass bottles in the beverage industry, food industry and brewing industry, such as soda bottles, beer bottles, milk bottles, cans, soy sauce bottles and wine bottles, is a very important thing, and the pharmaceutical formula of cleaning agent is a difficult technical work. There is no ideal drug in China. The main problems are: the descaling force is not strong, and it is easy to block the nozzle and pipeline of the bottle washing machine; The ability to remove rust from bottle stickers and bottlenecks is not ideal; The trace residue after washing is not ideal for food safety (such as phosphate residue); The washing water is discharged into public hazards (cannot reach the national standard). If sodium gluconate is the main part of the drug formulation of its glass bottle cleaning agent, the above problems can be solved (the Shanghai Soda Factory and the Shanghai Brewery conducted large-scale trials in the 1980s, with identification certificates). This application has not yet been developed in China. If it forms a market, it has great potential.
Used as water quality stabilizer
Sodium gluconate has excellent corrosion and scale inhibition, so it is widely used as water quality stabilizer, such as circulating cooling water system of petrochemical enterprises, low-pressure boiler, internal combustion engine cooling water system and other treatment agents. Because it has the following specific advantages.