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Airset mortar, also known as air-setting mortar or air-drying mortar, is a type of refractory mortar used for joining and bonding refractory bricks and other refractory materials in high-temperature applications. Unlike traditional refractory mortars that require firing or heating to cure, airset mortars can set and harden at room temperature when exposed to air. Here are some key points about airset mortar:
Composition: Airset mortars are typically composed of refractory aggregates (such as alumina, silica, magnesia, or zirconia), bonding agents (such as calcium aluminate cement or colloidal silica), and additives (such as plasticizers, dispersants, and setting agents). The exact composition may vary depending on the specific application and temperature requirements.
Setting Mechanism: Airset mortars rely on a chemical reaction between the bonding agents and water to initiate the setting and hardening process. When the mortar is mixed with water, the bonding agents react to form a strong bond, and the mortar gradually sets and hardens over time when exposed to air. This allows for easy application and curing at room temperature without the need for firing or heating.
Properties:
High-temperature resistance: Airset mortars are designed to withstand high temperatures encountered in industrial furnaces, kilns, boilers, incinerators, and other high-temperature equipment.
Thermal shock resistance: They exhibit good thermal shock resistance, allowing them to withstand rapid temperature changes without cracking or spalling, which is crucial for refractory linings.
Chemical stability: Airset mortars are chemically stable and resistant to attack from molten metals, slags, acids, alkalis, and other corrosive substances encountered in industrial processes.
Adhesion: They provide excellent adhesion and bonding strength between refractory bricks and other refractory materials, ensuring a durable and reliable refractory lining.
Easy application: Airset mortars can be easily applied using trowels, brushes, or pumping equipment, allowing for precise installation and repair of refractory linings.
Applications: Airset mortars are used in various high-temperature applications, including:
Joining refractory bricks: They are used to bond and join refractory bricks in furnaces, kilns, ladles, tundishes, crucibles, and other refractory-lined equipment.
Repairs and maintenance: Airset mortars are used for repairing and patching damaged refractory linings, cracks, joints, and gaps in industrial equipment.
Sealing and insulation: They are used for sealing expansion joints, gaps, and openings in refractory linings, as well as providing thermal insulation in high-temperature environments.
In summary, airset mortar is a versatile and convenient refractory material that offers excellent high-temperature resistance, thermal shock resistance, chemical stability, and adhesion properties. Its ability to set and harden at room temperature makes it suitable for a wide range of industrial applications requiring durable and reliable refractory linings.