Poly Naphthalene Sulfonate (PNS)

Polynaphthalene sulfonate is the most widely used and high range water reducing agent in China. It has many characteristics, such as a high water-reducing rate, no bleed air, little influence on setting time, relatively good adaptability to cement. Besides, it can be used in combination with other various admixtures, and the price is relatively cheap. The naphthalene based superplasticizer is commonly used to formulate high fluidity concrete, high strength concrete, high-performance concrete.

Kingsun poly naphthalene sulfonate superplasticizer has a strong dispersion on cement. Therefore, it can greatly improve the fluidity of the cement mixture and the slump of the concrete. At the same time, naphthalene superplasticizer can also greatly reduce water consumption and improve the workability of the concrete. In general, naphthalene based superplasticizer does not significantly alter the setting time of concrete. However, when used in excess, it has a slight retardation effect on concrete, but it does not delay the early strength growth of hardened concrete.

The PNS superplasticizer can significantly reduce the amount of water used and increase the strength of the concrete at each stage. When the concrete strength keeps constant, the cement can save 10% or more. Besides, it does not make the steel get rust because it has a small chloride ion content.

• Efficient water reduction. The water reduction rate of polynaphthalene sulfonate is as high as 25% or more. Therefore, it not only effectively increases the fluidity of concrete, reduce bleeding and segregation, but also improves the workability of concrete, facilitating construction, and being easy to compact.
• The enhancement effect is good. Under the same conditions of the number of cementitious materials, the compressive strength of concrete with naphthalene superplasticizer has improved compared with the reference concrete.
• Good adaptability. Kingsun poly naphthalene sulfonate is suitable for various specifications and models of cement. Therefore, it is easily compatible with other concrete admixtures. For example, the naphthalene based superplasticizer can be used in combination with admixtures such as expansion agents, air-entraining agents, and active agents. And their functions complement and stimulate each other.
• Safety. This concrete chemical is non-toxic, non-irritating, and radioactive, free of substances that are rusting to steel. Non-flammable and explosive, non-dangerous.
• Good durability. Sodium polynaphthalene sulfonate can effectively improve the pore structure of the concrete, thereby greatly improving the durability indexes of concrete such as impermeability, carbonation resistance, and freeze-thaw resistance.

• Raw material control. The performance of naphthalene sulfonate SS is affected by the quality of its raw materials and production process. Therefore, when choosing a water reducer, priority should be given to products produced by regular manufacturers, and their factory inspection reports and certificates of conformity should be checked. During use, the raw materials should also be regularly sampled and quality controlled to ensure that the quality of the raw materials is stable and reliable.
• Stir evenly. To ensure that the PNS superplasticizer is evenly distributed in the concrete, the mixing process must be sufficient and uniform. During the mixing process, the water reducer should first be dissolved in water (such as by solution method), and then added to the mixer along with the mixing water. The mixing time should be appropriately extended to ensure that the water reducer is fully mixed with cement, aggregate and other materials. For dry mixing, the water reducer powder should also be evenly sprinkled into the mixer at the beginning of mixing to avoid local excess or deficiency.
• Dosage control. The dosage of polynaphthalene sulfonate directly affects the performance of concrete. Therefore, the dosage must be strictly controlled according to the engineering requirements and the concrete design mix ratio. Generally speaking, the dosage is calculated based on the mass of cement. The recommended dosage range should be determined through experiments, taking into account factors such as cement type, concrete strength grade, and construction conditions. Excessive or insufficient dosage may lead to a decrease in concrete performance, so the recommended dosage must be strictly followed.
• Avoid mixing. When using poly naphthalene sulfonate superplasticizer, avoid mixing with other types of concrete admixtures (such as retarders, early strength agents, etc.) unless their compatibility is verified by special tests. Chemical reactions or physical effects may occur between different admixtures, resulting in abnormal concrete performance. Therefore, the product instructions and test reports should be carefully read before use to ensure that the selected admixtures do not interfere with each other.
• Dosage adjustment. With the change of construction conditions and the adjustment of concrete performance requirements, the dosage of naphthalene superplasticizer may need to be adjusted accordingly. For example, when constructing in high or low temperature environments, the dosage of water reducer may need to be adjusted to adapt to the impact of temperature changes on concrete performance. Therefore, during use, close attention should be paid to the performance changes of concrete, and the dosage of water reducer should be adjusted in time according to actual conditions.
• Compound use. In some cases, in order to obtain better concrete performance or meet specific engineering requirements, it may be necessary to mix PNS superplasticizer with other types of concrete admixtures. When mixing, the compatibility and synergy between the admixtures should be fully considered, and the optimal mixing ratio and usage method should be determined through experiments. At the same time, attention should be paid to controlling the stability and uniformity of the compounded mixture to ensure that the concrete performance meets the design requirements.
• Storage conditions. The storage conditions of this chemical are crucial to its performance stability. It should be stored in a dry, cool, ventilated dedicated warehouse away from fire and heat sources. Avoid direct sunlight and rain to prevent the water reducer from caking or deterioration due to moisture.