Features of Naphthalene Sulfonate Superplasticizer

Naphthalene sulfonate formaldehyde condensate, referred to as naphthalene sulfonate superplasticizer, can be divided into high-concentration products (Na2S04 content <3%) and medium-concentration products (Na2S04 content 3% 10%) according to the content of Na2S04 in its products, Low-concentration products (Na2S04 content> 10%). At present, most naphthalene-based superplasticizer synthesis plants have the ability to control the content of Na2S04 below 3%, and some advanced enterprises can even control it below 0.4%. This type of superplasticizer has a high water reduction rate (15%-25%), basically does not affect the setting time of concrete, and has low air entrainment (<2%), and the effect of improving concrete strength is obvious.

Critical dosage of naphthalene series superplasticizer

One of the advantages of naphthalene-based water-reducing agents is that the cement paste mixed with superplasticizers has a critical permeability. When the content is exceeded, the fluidity of the cement paste and the initial slump of the concrete will no longer increase. This point is called the saturation point. At this time, the amount of admixture is called the saturated amount. In the case of good adaptability of the admixture and cement, increasing the amount of water reducing admixture in concrete at the saturation point can maintain a large slump for a long time.

Disadvantages of naphthalene superplasticizer

One of the disadvantages of naphthalene-based water-reducing agents is the compatibility with cement admixtures, which is related to the degree of sulfonation, degree of polymerization, types of neutralizing ions, Na2SO4 content of the water-reducing agent itself, and the amount, Adding method, as well as the chemical composition of cement/admixture, mineral composition, alkali content, stone tone form, and aluminate ratio, fineness, and other factors. The second disadvantage is that the slump loss of the concrete is faster after mixing. Therefore, the composite retarder, air-entraining, and other components used in commercial concrete are generally modified at the same time to obtain the so-called pumping agent product.

Conclusion

• First, select the appropriate water-reducing agent according to the requirements of concrete and construction conditions;

• For non-pumped concrete with the small slump, or concrete with low construction technology requirements, naphthalene-based superplasticizers should be preferred during construction.

• When preparing high-strength and high-grade concrete, if a tea-based water-reducing agent is used, it is necessary to compound other components of admixtures, otherwise, it will be difficult to meet the requirements of construction and durability.

• For the preparation of self-compacting, high-fluidity concrete, or other concrete with high alkali content control index, polycarboxylic acid high-performance water-reducing agent should be preferred.

• In concrete projects with high strength, high frost resistance, high impermeability, and high durability, polycarboxylic acid high-performance water-reducing agents should be used first. 

The above are the main features of naphthalene sulfonate superplasticizer.  So if you want to learn more about the specifications or prices of this product, welcome to visit this link https://kingsunconcreteadmixtures.com/poly-naphthalene-sulfonate/.