Naphthalene superplasticizer is a chemical industry synthesized admixture used to increase the strength of concrete. It is non-corrosive and non-chlorine compound. In addition, it also has the advantage of not delaying the early strength growth of hardened concrete.
Naphthalene superplasticizer is used in the construction of pre-cast and cast-in-situ concrete. It can improve the slump retention and fluidity of the cement mixture. It can also reduce water consumption and minimize the damage caused by freezing. Moreover, it is applied on steam-cured precast members.
Naphthalene based superplasticizer is widely used in various industries. This admixture is compatible with different types of Portland Cement. Sodium Naphthalene Sulfonate is a form of naphthalene superplasticizer.
Sodium naphthalene sulfonate is a high range water reducing agent. Unlike other naphthalene based superplasticizer, it has the ability to bind with calcium ions. The calcium ions adsorb to the cement particles. They preferentially bind to the STPP. This results in a reduction in the adsorption of FDN. When a proper dosage is applied, optimum results are achieved.
Sodium Naphthalene Sulfonate has been found to be a useful admixture for concrete with high fluidity. Using sodium naphthalene sulfonate in high fluidity concrete results in a strong, dense, and durable structure. Because of its properties, it is commonly referred to as a superplasticizer.
Several studies have been conducted on naphthalene based superplasticizers. These studies have provided estimates of the optimal dosage, depending on the compressive strength of the concrete. Generally, the optimal dosage is estimated using a 0.3 to 0.5 w/c ratio of naphthalene based superplasticizers in the cement paste.