What is Water Reducing Admixture
Water reducing admixture is also called water reducing agent or water reducer. It is a concrete admixture that can reduce water consumption while the concrete slump is basically unchanged. Most of the water reducers belong to the anionic surfactant. Adding the water reducer admixture into concrete, then it can reduce the unit water consumption, improve concrete’s workability and the fluidity of the concrete mixture.
The Role of Water Reducer for Concrete
As a concrete additive, water reducer for concrete plays a very important role in concrete applications. For example, the use of water-reducing admixtures can reduce the amount of water and increase the strength of concrete. It can also improve the pore structure of concrete and increase its compactness. The use of water reducer in concrete can reduce the bleeding and segregation of concrete mixture and delay the setting time of the mixture. Adding concrete water reducer can save cement consumption and reduce engineering costs. It can also improve the quality of concrete in construction projects. According to water reduction and enhancement capacity, it is divided into the ordinary water-reducing agent and high range water reducer.
Types of Water Reducing Admixtures in KINGSUN
KINGSUN is one of the leading construction chemical manufacturers and suppliers in China. We also have focused on researching and producing concrete admixtures with high quality for many years. There are three types of water-reducing admixtures for sale in KINGSUN, they are sodium lignosulfonate, sodium naphthalene sulfonate, and polycarboxylate superplasticizer. If you would like to know their price or some other information, please feel free to contact us. Here are some introduction to the three types.
1. Sodium lignosulphonate
Sodium lignosulphonate is a common water reducer in concrete and its raw material is lignin. It can be used in a mortar to improve the workability, fluidity, and strength of concrete. The water reduction rate of sodium lignosulphonate is between 5% and 10%. Sodium lignosulphonate has three functions. They are namely dispersion, venting, and initial hydration inhibition. There are three uses of sodium lignosulphonate. Firstly, it can reduce water consumption and increase the strength of cement. Second, it can improve the workability and fluidity of the concrete while maintaining the same amount of water and strength. Thirdly, it can reduce the amount of cement used and the amount of water used to maintain the same strength.
2. Sodium Naphthalene Sulfonate Formaldehyde（SNF/PNS/FND/NSF）
Sodium naphthalene sulfonate is the earliest high range water reducing admixture used in China. It is a product of naphthalene sulfonation by sulfuric acid and condensation with formaldehyde and is an anionic surfactant. The appearance of naphthalene type concrete water reducers could be light yellow to dark brown powder depending on the product. It is easily soluble in water and has good dispersion effect on many powder materials such as cement. The water reduction rate of SNF can reach 25 percent. Different water-reducing agents have different characteristics.
The main characteristics of sodium naphthalene sulfonate are as follows:
- When the strength and slump are basically the same, the amount of cement can reduce by 10% to 25%.
- When the water-cement ratio is constant, the initial slump of concrete can increase by more than ten centimeters, and the water reduction rate can reach 15% to 25 percent.
- It has a significant early strength and enhancement effect, and its strength can increase by 20-60%.
- It can improve the workability of concrete, adapt to various types of cement. Moreover, it is compatible with other types of concrete admixtures.
- Particularly suitable for use in the following concrete works: fluid concrete, plasticized concrete, steamed concrete, impervious concrete, waterproof concrete, natural curing precast concrete, steel and prestressed reinforced concrete, high strength ultra high strength concrete.
3. Polycarboxylate based superplasticizer（PCE）
Polycarboxylate based superplasticizer is the most advanced high range water reducing admixture in the world because it has the highest technological content, the best application prospect, and the best comprehensive performance. Compared with the performance of similar products at home and abroad, the polycarboxylate high range water reducer admixture has reached the international advanced level in terms of technical performance index and cost performance. Polycarboxylate superplasticizer is a new type of superplasticizer with unique performance and no pollution. In general, it is an ideal admixture for high-performance concrete.
Compared with other water-reducing admixtures in concrete, polycarboxylate superplasticizer has many advantages in performance and production, such as high water reduction rate with a low dosage, the loss is small when the slump is light, less impact on cement setting time, good adaptability to cement.
How to Use Water Reducer Admixture
There are two common ways to use water reducer concrete admixture. The first one is to dissolve the water reducing agents in water to form a solution, then add it to the mixture and stir together. This method is accurate and easy to use. It is often used in construction. The second method is to add the water-reducing admixture and stir it evenly after the concrete mixture has transported to the pouring place. This method can avoid the stratification, segregation and slump loss of concrete during transportation, improve the use effect of water-reducing admixture, and the adaptability of water reducer to cement. This method is suitable for commercial concrete with concrete transport mixers.
Buy Concrete Admixtures from KINGSUN
The choice and use of additives have a great influence on the quality of concrete. For that reason, KINGSUN Chemical Co., Ltd. is definitely worthy of your trust. As a leading construction chemical company in China, KINGSUN Chemical Co., Ltd. has been committed to providing customers with the highest quality products according to customer’s needs for many years. In addition, our products export to many countries and regions and we have reached a long-term friendly cooperation agreement with many foreign companies. If you would like to buy concrete water-reducing admixtures or some other concrete admixtures, please leave us a message or send an e-mail, we look forward to hearing from you.