CAA (Calcium Aluminate Aggregate)
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CAA is a hydraulic binder that fuses limestone and bauxite in a rotary kiln. CAA cement sets quickly, and its high early strength is beneficial in precast concrete production, where rapid demolding and handling are required. CAA cement is also used in refractory castable, which is used to line high-temperature furnaces, kilns, and boilers.
CAA systems are proven to work and are impervious to biogenic attacks:
- CAA systems are formulated with a high calcium aluminate concentration, giving them exceptional strength and rapid-setting properties. This allows the system to set quickly, which minimizes downtime and allows the sewer to be put back into service quickly.
- CAA systems have excellent adhesion properties, which enable them to bond tightly to the substrate. This creates a strong, durable lining that can withstand high water pressure, chemical attacks, and abrasion.
- Biogenic attacks are caused by bacteria that thrive in sewage environments. These bacteria produce sulfuric acid, which can erode and corrode sewer structures over time. CAA systems are highly resistant to biogenic attacks because they are not susceptible to the acid these bacteria produce. In addition, the dense, impervious surface of the CAA lining prevents the bacteria from penetrating the surface and causing further damage.
- CAA systems create a seamless, smooth surface that is easy to clean and maintain. The smooth surface prevents the accumulation of debris, which can cause blockages and backups in the sewer system.