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Naphthalene concrete superplasticizer; an efficient and cost-effective solution to increase concrete performance
If you are looking for an admixture that can significantly increase the fluidity and workability of concrete at a reasonable cost, naphthalene superplasticizer is the ideal choice. This product, which is considered a second generation of concrete superplasticizers, is based on polynaphthalene sulfonate (PNS) and is known as a strong water reducer with a wide performance range.
What is naphthalene superplasticizer and how does it work?
Naphthalene superplasticizers are anionic synthetic polymers with a linear structure obtained from the condensation of naphthalene sulfonic acid and formaldehyde. The presence of sulfonate groups in this structure gives the molecules a negative charge that, in the alkaline environment of cement, is adsorbed on the positively charged particles of cement. This adsorption creates an electrostatic repulsive force between the particles and prevents their aggregation and agglomeration. As a result, the cement particles are effectively dispersed and the water trapped between them is released, which leads to a significant increase in the flowability (slump) of concrete without the need to add additional water.
Key Benefits:
Significantly increasing the fluidity and efficiency of concrete allows for concreting in sections with dense reinforcement and difficult-to-access spaces. Effectively reducing the water-cement ratio by up to 25% leads to a significant increase in compressive strength, durability, and reduced permeability of concrete. Also, the use of this additive improves the modulus of elasticity, adhesion of concrete to steel, and reduces shrinkage and creep in hardened concrete. Naphthalene superplasticizers have less effect on the setting time of concrete and create less air entrainment, which is one of its important advantages.
Main applications:
Production of high-performance concrete (HPC) for important structures such as bridges and tunnels. Construction of prefabricated concrete parts that require high early strength and rapid formwork. Industrial flooring, parking lots and surfaces with special textures. Hot weather concreting where we face the challenge of rapid slump reduction. Production of self-compacting concrete (SCC) and waterproof concrete. This product is also known as a more economical option compared to new generation superplasticizers (carboxylates) and is a cost-effective option for many construction projects.
Suggested dosage:
The amount of naphthalene superplasticizer used usually varies between 0.5 and 1.5 percent by weight of cement used, and its effect is highly dependent on the type of cement, mixing design, ambient temperature, and other ingredients. It is important to note that using more than the recommended amount can increase setting time and even cause segregation and water loss in concrete. Therefore, it is absolutely necessary to conduct field tests to determine the optimal dosage according to the specific conditions of each project.
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