Water reducing agents are widely used in the construction industry and bridge industry. Many newcomers always want to know: What is the difference between concrete water reducing agents and naphthalene series water reducing agents? However, because the contact time is relatively short, it is still relatively short. However, everyone’s understanding of water-reducing admixture is not very comprehensive. Water-reducing admixture is an important concrete admixture that can minimize the water-cement ratio of concrete and improve the strength and durability of concrete. Next, let’s take a look.
1. Concrete water-reducing agent
1. The role of concrete water-reducing agent is that surfactants play an important role in the cement hydration process. Water reducing agent can reduce the unit water consumption without affecting the workability of concrete; or it can improve the workability of concrete without changing the unit water consumption.
2. After cement and water are mixed, a hydration reaction occurs, and some flocculation-like structures appear, which wrap a lot of mixing water, thereby reducing the workability of fresh concrete
3. After water-reducing agent is added to concrete, the hydrophobic groups of the water-reducing agent are directionally adsorbed on the surface of the cement particles, while the hydrophilic groups are directed toward the aqueous solution, forming a single-molecule or multi-layer adsorption film.
4. After the water-reducing agent is added, not only can the workability of fresh concrete be improved, but also because the water-cement ratio in the concrete has dropped significantly, the internal pore volume of the cement stone has been significantly reduced. The cement stone is denser and the compressive strength of the concrete is significantly increased.
2. Naphthalene-based water-reducing agent
1. Naphthalene-based water-reducing agent is a non-air-entraining high-efficiency water-reducing agent synthesized through chemical industry. The chemical name is naphthalene sulfonate formaldehyde condensation. things. It has the functions of non-air entrainment, super plasticization, efficient water reduction and reinforcement.
2. Strong adaptability, suitable for various specifications and models of cement. The product has good compatibility with other admixtures, and can be matched with admixtures such as expansion agents, air-entraining agents, and active admixtures such as fly ash. Their functions complement and stimulate each other.
3. Efficient water reduction. Its water reduction rate reaches more than 25%. Superplasticization can effectively increase the fluidity of concrete, reduce bleeding and segregation, thereby improving the workability of concrete, making it easier to construct and compact.
4. The sodium sulfate content of the product is low, and the prepared liquid has no crystallization in winter, which solves the problem of pipeline blockage caused by sodium sulfate crystallization in winter concrete manufacturing, and provides convenience for winter concrete construction; and After the retarding component is compounded, the concrete slump loss is small over time.
5. The setting time is appropriate. The product has little effect on the initial and final setting time of cement, and the difference in setting time is generally within 1 hour. Product safety performance is good. It is non-toxic, non-irritating and non-radioactive, and does not contain substances that are harmful to steel bars. It is not flammable or explosive and is a non-dangerous product.
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