Shotcrete Additives

Shotcrete is a type of concrete that is pneumatically applied at high velocity onto a surface, and it typically sets quickly due to the use of accelerators. However, if the set time is too fast, correctly placing and finishing the shotcrete can be difficult, leading to poor performance and durability. Shotcrete additives are added to the mixture to modify its properties and enhance performance.

Using Aluminum Hydroxide with Aluminum Sulfate in alkali-free shotcrete accelerator systems can help increase the saturation point and improve the performance of the shotcrete. The saturation point of a shotcrete system refers to the point at which the mixture of accelerators, cement, and other additives is optimized for the desired performance characteristics. If too much accelerator is added, the set time may be too fast, and the shotcrete may be challenging to work with. On the other hand, if too little accelerator is added, the shotcrete may not set quickly enough, leading to poor bonding and reduced strength.

Adding Aluminum Hydroxide to Aluminum Sulfate can improve the set time of the shotcrete, leading to faster curing times and improved strength and durability. This is because Aluminum Hydroxide reacts with Aluminum Sulfate to form Aluminum Trihydroxide, which has a high surface area and can help to accelerate the cement hydration process.