Sodium lignosulfonate is an organic substance with the chemical formula C20H24Na2O10S2. It is a polydisperse and inhomogeneous anionic polyelectrolyte with different molecular weights and structures. Its appearance is light brown, free-flowing powder with no special odor. It is hygroscopic, easily soluble in water and alkali, precipitates when exposed to acid, and has strong dispersing ability. Its aqueous solution is brown to black and has colloidal properties. Of course, sodium lignosulphonate has a wide range of applications, such as feed processing, mining, oil drilling, pesticides, rubber, printing and dyeing, leather, and cement and concrete production.
The Role of Sodium Lignosulfonate in Concrete
Due to sodium lignosulfonate in concrete has good working performance, so it mainly plays the role of water reduction, retardation and air entrainment in concrete. It can significantly improve the plasticity and fluidity of concrete, making concrete easier to construct and pour. During the concrete construction process, more fluid concrete can better fill the voids in the formwork, thereby reducing the shortening and deformation of the concrete. In addition, sodium lignosulfonate can also improve the compressive strength and durability of concrete, reduce the heat of hydration, and reduce shrinkage and cracking.
Moreover, sodium lignosulfonate for concrete also has many advantages such as environmental protection, low price, and good economic benefits. Therefore, sodium lignosulfonate always plays an increasingly important role in the field of concrete admixtures.
| Items | Sodium Lignosulfonate |
|---|---|
| Appearance | Yellow Brown Powder |
| Dry Matter % | 92 min |
| Lignosulphonate % | 60 min |
| Moisture % | 7 max |
| Water-insoluble matter % | 0.5 max |
| Sulfate (as Na2SO4) % | 4 max |
| PH Value | 7.5-10.5 |
| Content of Ca and Mg % | 0.4 max |
| Total reducing matter % | 4 max |
| Content of Fe % | 0.1 max |
| Packing | Net 25kg PP bags; 550kg jumbo bags |