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.
The purpose of sodium gluconate in concrete is described in detail below.
Sodium gluconate as water reducer
The following effects can be obtained after adding sodium gluconate to reduce the water cement ratio：
- 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 the initial setting time is in positive proportion to the dosage, that is, when the dosage is doubled, the initial setting time is delayed to ten times, which prolongs the working time from a few hours to a few days without damage to the strength. This is an important advantage especially in hot days and when it needs to be placed for a long time.
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 a public hazard (unable to meet the standards set by the state). If sodium gluconate is used as the main body in the pharmaceutical formula of its glass bottle cleaning agent, the above problems can be solved（ In the 1980s, large-scale tests have been carried out in Shanghai soda factory and Shanghai brewery, and there are identification certificates). This application has not 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: