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02/09/2024 8:15 pm
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Causes of Yellow Discoloration in Fresh Concrete
Yellow discoloration in fresh concrete can be caused by several factors.
Here are some common reasons:
1. Chemical Reactions:
- Alkaline Reaction: When certain types of cement, such as high-alkali cement, are used in combination with reactive aggregates (like silica-rich materials), a chemical reaction can occur, leading to yellow discoloration.
- Sulfate Attack: If sulfate-rich materials come into contact with the concrete, they can react with the cement, causing yellow staining.
2. Contamination:
- Foreign Substances: Introduction of foreign substances, such as organic materials or certain chemicals, can discolor the concrete.
- Water Quality: Impurities in the water used to mix the concrete can also contribute to discoloration.
3. Environmental Factors:
- Sunlight Exposure: Prolonged exposure to sunlight can cause the concrete to darken or discolor, including yellowing.
- Temperature: Extreme temperatures, both hot and cold, can affect the curing process and lead to discoloration.
4. Incorrect Mixing:
- Inadequate Mixing: If the concrete is not mixed thoroughly, it can result in uneven distribution of pigments and aggregates, causing discoloration.
To prevent yellow discoloration in fresh concrete, it's essential to:
- Use low-alkali cement or reactive aggregate-resistant cement.
- Ensure the water used for mixing is clean and free of contaminants.
- Protect the concrete from prolonged exposure to sunlight and extreme temperatures during the curing process.
- Mix the concrete thoroughly to ensure even distribution of ingredients.
If you encounter yellow discoloration in fresh concrete, it's recommended to consult with a concrete professional to determine the specific cause and appropriate corrective measures.
