Slurry mixers are used in ready-mix operations to shorten mixing and loading times and to provide a higher-quality, more consistent concrete mix. A slurry mixer is a mechanical device that premixes cement, water and admixtures in an enclosed vessel.
Advantages include increased strength, improved air entrainment, improved slump control, reduced mixing times, dust containment, minimizing or eliminating cement balls, ease of installation, less transit-mixer drum wear, potential material savings and eliminating the need to wash transit mixers.
There are two types of slurry mixers: vortex and paddle. Vortex mixers use a 50hp motor and an impeller to create a vortex that blends cement and admixtures, and then transfer the wet slurry for loading. Paddle mixers use blades mounted in a horizontal cylindrical tank to blend cement, admixtures and water.