What are the differences between superplasticizers and ordinary water reducers

Water reducer is a common type of concrete admixture. It has the function of reducing water and strengthening concrete without affecting the construction and workability of concrete. Both superplasticizers and ordinary water reducers are concrete admixtures that can effectively improve the rheological properties of concrete mixtures. They are indispensable additives in construction projects. However, with the development of technology, the effect of water-reducing agents has become more and more obvious, among which superplasticizers are more obvious in water-reducing and other effects. So in what aspects are superplasticizers more advanced?

Common water reducing agents are mainly lignosulfonates. The superplasticizers are mainly naphthalene based superplasticizer (naphthalene series), melamine series, and their compound water reducers, of which naphthalene series are the main ones, accounting for 67%. Most of the superplasticizers are naphthalene series superplasticizers with naphthalene as the main raw material. Naphthalene-based superplasticizers can be divided into high-concentration products (Na2SO4 content <3%), medium-concentration products (Na2SO4 content 3%-10%), and low-concentration products (Na2SO4) according to the level of Na2SO4 content in their products. Content>10%). Most naphthalene-based superplasticizer synthesis plants have the ability to control the content of Na2SO4 below 3%, and some advanced companies can even control it below 0.4%. Such as Kingsun concrete admixtures manufacturer in China.

1. The water reduction rate of ordinary water-reducing agents is usually 5%~10%, and the water reduction rate of first-class products is ≥8%; while the water reduction rate of superplasticizers can reach 12%~25%, or even higher. The water reduction rate of first-class products is ≥12%.

2. The superplasticizer can greatly improve the workability of concrete under the condition that the water-cement ratio is unchanged. It will not cause excessive retardation of the concrete; and under the condition of the same amount of cement, the slump of concrete mixed with ordinary water reducing agent is usually about 10cm.

3. Under the condition that the slump is basically the same, the concrete superplasticizer can greatly reduce the mixing water consumption of concrete, significantly reduce the water-cement ratio, and thus greatly increase the strength of concrete. Therefore, the superplasticizer is mainly used to configure high-strength and reduce flowable concrete with high water requirements; while the water reduction rate of ordinary water-reducing agents is relatively low, which is mainly used to formulate concrete with low strength grades and low water reduction requirements.

4. In terms of preparation cost, specific types of superplasticizers are usually synthetic compounds with a single component, and the price is relatively high; while most common superplasticizers use industrial by-products as their main raw materials and are inexpensive.

Although the superplasticizer has better water-reducing, dispersing, and enhancing effects than ordinary water-reducing agents, it is a composite multifunctional superplasticizer with water-reducing and other functions, such as early-strength superplasticizers, slow Condensing superplasticizers, and air-entraining superplasticizers have more advantages than single-component synthetic superplasticizers, and can better meet the various requirements of fresh concrete and hardened concrete performance. With the development of technology, it is more efficient Water-reducing agents will gradually replace the development of ordinary water-reducing agents, but the current ordinary water-reducing agents have some of their characteristics.

This aphthalene based superplasticizer has less influence on the setting time of concrete and has better adaptability to cement. It can also be used in combination with other concrete admixtures, and its price is relatively cheap. Please visit this page link https://kingsunconcreteadmixtures.com/poly-naphthalene-sulfonate/ to get more information about this product.