Sodium gluconate is the white crystalline powder, easily soluble in water, slightly soluble in alcohol, insoluble in ether, non-toxic, good thermal stability, and non-deliquescent. Its chemical formula is C6H11NaO7, and the melting point is 206~209℃.
As an extremely versatile polyhydroxy organic acid salt, sodium gluconate can be widely used in construction, textile dyeing, pharmaceutical, food and other industries. Specifically used as cement admixture, acid-base balance agent, water quality stabilizer, surface cleaning agent, food additive, etc.
| Item | Sodium Gluconate |
|---|---|
| Appearance | White crystalline powder |
| Purity % | 98 Min |
| Loss on drying % | 0.50 Max |
| Sulfate (SO42-) % | 0.05 Max |
| Chloride (Cl) % | 0.07 Max |
| Heavy metals (Pb) ppm | 10 Max |
| Reduzate (D-glucose) % | 0.7 Max |
| PH (10% water solution) | 6.2~7.5 |
| Arsenic salt(As) ppm | 0.2 Max |
| Packing & Loading | 25 kg/PP bag, 26tons in 20’FCL without pallets; 1000kg/Jumbo bag on a pallet, 20MT in 20’FCL; 1150kg/Jumbo bag on a pallet, 23MT in 20’FCL; |
Sodium Gluconate Retarder for Construciton Industry
As a concrete retarder, sodium gluconate not only greatly improves the workability of concrete, reduces slump loss, and improves the later strength of concrete, but also significantly delays the initial and final setting times of concrete. (Generally, when the dosage of sodium gluconate is below 0.15%, the logarithm of the initial coagulation time is proportional to the dosage. That is, when the dosage is doubled, the initial coagulation time will be delayed to ten times the original, making the working time Extend from hours to days without compromising the strength of the concrete.)
This property makes sodium gluconate an important advantage in hot weather and long storage times, preventing concrete from setting during transportation. Generally applicable to pumped concrete, large fluidity concrete, large volume concrete, high strength performance concrete, etc. Here’s why we use sodium gluconate in the construction industry
(1) The use of sodium gluconate can reduce the water-cement ratio, thereby increasing the strength of concrete.
(2) It is important to keep the water-cement ratio unchanged and improve the processability in high-temperature areas (for example, a large amount of sodium gluconate is used in bridge construction in the Middle East).
(3) Adding sodium gluconate into the concrete mix can delay the setting time, which is important for long and difficult pouring.
(4) In the modern concrete industry, ready-mixed concrete is generally prepared at a central location and then transported by mixer trucks. In this case, it is important to increase workability and initial setting time.
(5) Sodium gluconate can reduce the W/C ratio to produce concrete with higher strength and durability, which is especially important for high-strength reinforced concrete.
(6) Adding the sodium gluconate powder can extend the working time of prepared mortar for masonry.
(7) Due to the high temperature of the oil well irrigation mud, the operation is difficult. When adding sodium gluconate, the concrete can work at 170℃ for several hours.