Magnesium oxide, also known as magnesia, is a white solid mineral naturally occurring as periclase, comprising magnesium (Mg) and oxygen (O). Industrially, magnesium oxide is utilized across various sectors. The cement produced from magnesium oxide and phosphate, termed magnesium phosphate cement, results from blending magnesium oxide (MgO) with a soluble phosphate like ammonium hydrogen phosphate. This mixture yields a robust cement that sets rapidly and displays exceptional fire resistance and adhesion characteristics.
Magnesium Oxide (MgO): The base material providing the primary cementitious property. It reacts with water to form magnesium hydroxide.
Monoammonium Phosphate (MAP): Acts as a setting and hardening accelerator. When added to MgO cement, it can react with magnesium hydroxide to form magnesium ammonium phosphate, which can contribute to the early strength of the cement.
Borax (Sodium Borate): Often used as a retarder to control the setting time of cement, making it workable for a longer period.
Methylcellulose(MC): Methyl cellulose is utilized as a thickener, stabilizer, and emulsifier to improve workability and adhesion
Haneen Othman
1.5 hours
3/10
1. Combine magnesium oxide (MgO) and borax.
2. Add methylcellulose (MC) and blend thoroughly.
3. Introduce a small amount of water to bring the materials together.
4. Incorporate phosphate and mix well.
5. Gradually add water until the mixture reaches a slightly looser, stickier consistency than clay.
6. Utilize the mixture within 40 minutes before it begins to harden.
