1. What is the difference between naphthalene-based water-reducing agents and polycarboxylic acid water-reducing agents?
There are many types of water-reducing agents. The most commonly used ones now are naphthalene-based water reducing agents. There are two types of water-reducing agents and polycarboxylate water-reducing agents. So what is the difference between these two types of water-reducing agents?
1. Difference in water-reducing rate
The water-reducing rate of polycarboxylic acid-based water-reducing agent is significantly higher than that of naphthalene-based water-reducing agent. In the case of water reducing rate, the dosage of polycarboxylate water reducing agent may be less than that of naphthalene series water reducing agent; at the same time, as the dosage increases, the ultimate water reducing rate of polycarboxylate water reducing agent far exceeds that of naphthalene series, and The dosage of naphthalene-based water-reducing agent has exceeded the limit when it is around 2.0%, which shows that polycarboxylate water-reducing agent is more suitable for high-strength concrete with low water-cement ratio.
2. Difference in action mechanism
The action mechanism of polycarboxylate superplasticizer is mainly steric repulsion. In addition to steric repulsion, There are also strong air-entraining isolation “ball” effects and solid-liquid interface energy reduction effects; the mechanism of action of naphthalene series water-reducing agents is mainly electrostatic repulsion, and there are almost no other beneficial effects on water reduction.
2. Which one is better, polycarboxylate water-reducing agent or naphthalene-based water-reducing agent?
Comparing polycarboxylate water-reducing agent and naphthalene-based water-reducing agent, which one is better? Better, this is a question that many friends are concerned about. In fact, this question depends on the actual situation.
1. From the perspective of usability, polycarboxylate superplasticizer has strong plasticity retention and can effectively control the loss of slump over time without having much impact on the hardening time of concrete. It has a large reinforcing effect and has shrinkage resistance, which can more effectively improve the impermeability and frost resistance of concrete, and can improve the durability of concrete to a greater extent than naphthalene-based water reducing agents.
2. From a price point of view, the price of naphthalene-based water-reducing agent is generally cheaper than that of polycarboxylate water-reducing agent. However, taking into account the dosage and use effect, polycarboxylate water-reducing agent The cost of use may be lower.
3. From the perspective of environmental protection performance, the production process of naphthalene-based water-reducing agents has certain pollution to the environment, while polycarboxylate water-reducing agents adopt an environmentally friendly and green synthesis production process, which can save cement and improve Concrete performance and promote the sustainable development of green concrete and low-carbon concrete technology.
In summary, polycarboxylate water-reducing agents are better than naphthalene-based water-reducing agents. Polycarboxylate water-reducing agents are also a major trend in the development of water-reducing agents in the future.
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