Effect of cellulose ether with different viscosity on concrete properties

Cellulose ethers are commonly used as admixtures in concrete to improve its workability and performance. The viscosity of cellulose ether is an important factor that influences its effectiveness as an admixture. Here are some effects of cellulose ether with different viscosity on concrete properties:

1. Workability: Cellulose ethers increase the workability of concrete by reducing its viscosity and improving its flowability. As the viscosity of cellulose ether increases, the workability of the concrete improves. However, excessive viscosity can lead to segregation and bleeding in the concrete.
2. Setting Time: Cellulose ethers can also affect the setting time of concrete. As the viscosity of cellulose ether increases, the setting time of concrete also increases. This can be problematic in applications where fast setting time is required.
3. Compressive Strength: The addition of cellulose ethers to concrete can improve its compressive strength. Higher viscosity cellulose ethers are more effective at improving compressive strength than lower viscosity cellulose ethers. However, excessive use of cellulose ethers can reduce the compressive strength of concrete due to the reduction of cement content.
4. Durability: Cellulose ethers can also improve the durability of concrete by reducing its permeability to water and other harmful substances. Higher viscosity cellulose ethers are more effective at reducing permeability and improving durability.
5. Air Content: Cellulose ethers can increase the air content of concrete, which can be beneficial in some applications. However, excessive air content can reduce the strength and durability of concrete.

In conclusion, cellulose ethers are effective admixtures for improving the performance of concrete. The viscosity of cellulose ether is an important factor that influences its effectiveness. Higher viscosity cellulose ethers are more effective at improving workability, compressive strength, and durability, but can also increase setting time and air content. It is important to carefully select the appropriate viscosity of cellulose ether based on the specific requirements of the application to ensure optimal performance of the concrete.