Building formwork release agent

Concrete Release Agent

Concrete release agents are substances used in construction to prevent concrete from adhering to formwork. Their primary function is to be applied to construction formwork before concrete pouring, ensuring that the formwork does not stick to the concrete surface after pouring, thereby maintaining the smoothness of the concrete surface.

Types of Concrete Release Agents

Concrete release agents are mainly divided into the following categories:

Oil-based release agents: These include engine oil, diesel oil, emulsified engine oil, tall oil, etc. For example, engine oil and diesel oil can be mixed in a 3:7 volume ratio, or tall oil, kerosene, and spindle oil can be mixed in a 1:7.5:1.5 volume ratio.

Water-based release agents: The main component is sodium alginate. The preparation method involves mixing sodium alginate, talcum powder, laundry detergent, and water in a weight ratio of 1:13.3:1:53.3.

Resin-based release agents: Such as methyl silicone resin, which uses ethanol as a curing agent, with a mixing ratio of 1000:3~5.

Usage of Concrete Release Agents

Before use, whether it is new formwork or formwork that has been used and cleaned of dirt and rust, a release agent must be applied. The specific steps are as follows:

Preparation stage: Select the appropriate type of release agent, such as oil-based, water-based, or resin-based.

Preparation: Mix according to the selected type. For example, oil-based release agents require mixing engine oil, diesel oil, etc., in specific proportions; water-based release agents require mixing sodium alginate, talcum powder, etc., in specific proportions; resin-based release agents require mixing methyl silicone resin and ethanol in specific proportions.

Application: Before concrete pouring, evenly apply the prepared release agent to the construction formwork. Ensure even application to avoid missed spots.

Market Applications of Concrete Release Agents

In the market, concrete release agents mainly include the following types:

Pure oil-based release agents: Main components include mineral oil, animal oil, vegetable oil, etc. These release agents offer good isolation and lubrication properties but may contaminate the concrete surface, affecting its decorative appearance.

Emulsified oil-based release agents: These are divided into water-in-oil emulsions and oil-in-water emulsions. These release agents cause almost no contamination to concrete, are suitable for various types of formwork, and are widely promoted and used.

Saponified oil-based release agents: The main components are oils that undergo saponification with alkali to form emulsions. They are suitable for wooden formwork, cost-effective, and easy to use.

Paraffin-based release agents: The main component is paraffin, which offers good air release effects on the surface of concrete products. However, an overly thick coating may affect aesthetics.

Future Development Trends of Concrete Release Agents

With the continuous advancement of construction technology, concrete release agents are also evolving. Future development trends may include:

Eco-friendly release agents: Developing non-toxic, pollution-free eco-friendly release agents to reduce harm to the environment and human health.

High-performance release agents: Improving the chemical resistance, heat resistance, and stress performance of release agents to adapt to more complex construction environments.

Smart applications: Integrating IoT technology to enable intelligent monitoring and management of release agents, improving construction efficiency and quality.

In summary, concrete release agents play a crucial role in construction. They come in various types, are easy to use, and have wide market applications. Future trends will focus more on environmental sustainability and smart applications.