The Characteristics of Naphthalene based Superplasticizer
Naphthalene based superplasticizer (sodium naphthalene sulfonate formaldehyde condensate) and some other chemical admixtures play an important role in modern concrete materials and technologies. It can improve the various properties of concrete and promote the development of new concrete technologies. It 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.
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. It 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.
The product can be directly used in concrete, and the performance of the water-reducing agent concrete has been mastered by the majority of engineers. The effect of excessive or insufficient mixing on the performance of concrete can also be predicted; The naphthalene-based high range water reducing agent has good adaptability with other admixtures and can be widely used as the composition of composite admixtures, such as pumping agents, waterproofing agents, air-entraining water-reducing agents, antifreeze, etc. Its cost-effectiveness is relatively high and it can be accepted by the engineering community.
