Sodium lignosulfonate used as water reducing agent

Ligosulfonate is a water-soluble multifunctional polymer electrolyte, is a lignosulfonate, with dispersing biological slime, dirt iron oxide, calcium phosphate ability, but also zinc ions, calcium ions to form a stable network compound.
Lignosulfonate and calcium lignosulfonate commonly used in the multi-purpose concrete waterproofing agent superplasticizer, concrete after adding water reducer, superplasticizer hydrophobic groups directed adsorbed on the surface of cement particles, hydrophilic groups pointing aqueous composition or adsorbed monomolecular film of molecules, the charge for the same cement particles are dispersed seemingly mutually exclusive, to release excess water from between the particles, in order to achieve the purpose of water reduction. At the same time, due to the reduced interfacial tension and surface tension of water between the cement particles, while maintaining the same degree of fluidity, a corresponding reduction in water consumption, and thus also play a role in reducing water. It can greatly reduce the hydration of concrete to reduce the porosity and increase the compactness of concrete, thereby greatly improving the strength and impermeability of concrete.
Lignosulfonate is a natural polymer having a molecular weight of 1,000 to 30,000. It was later extracted from the pulp of waste produced by the fermentation of alcohol, soda and then made mainly of calcium lignosulfonate, lignosulfonate, lignosulfonate and magnesium, among the most widely lignosulfonate calcium sulfite pulp waste is made. This rich source of raw water reducing agent, manufacturing process is simple, inexpensive, more common in domestic applications, accounting for 80% of total water reducer. But its effect is not very good, there are air-entraining, retarding effect, belonging to the ordinary water reducer, early strength agent and the effect will be better.

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