What is the best type of mixer for my application? Regardless of what people have told you, or what you have read, there is a best mixer for each application. Each excels in a different type of concrete:
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Twin Shaft – It can be applied to many kinds of concrete at high speed, low wear, and low maintenance. It is designed for rough and tough jobs, such as dam building and ready-mix. Handles aggregate sizes to several inches. With incomplete discharge, it is not suitable for mixes of different type or color. End of shift cleanout is slow and difficult (unless high pressure washout system is used). Performance on dry cast mixes is not as good as the planetary mixers. It can produce the highest throughput of concrete in a given floor space batching plant, and give double plant output without modification to hoppers, scales, belts etc. “Compulsory mixing” action gives high quality concrete with maximum strength. Most of the models have single discharge door.
Planetary – It is generally applied to highest quality precast, especially dry cast, block, pavers, architectural. It is characterized by medium to high speed, medium wear-resistance, and medium maintenance. It is designed for precast, block, and pavers. With Good cleanout, it is good for colored mixes. Although it is more complex mechanically, it’s the best and very reliable models. The moisture sensors are easy to install in floor that up to 4 discharge doors. “Compulsory mixing” action gives high quality concrete with maximum strength.
Rotating pan – Most of these type mixers, which are good for precasting both wet and dry cast, are obsolete. Its mixing action is similar to planetary but with more complexity mechanically, and higher maintenance. It is difficult to install moisture sensors. With single discharge door, most models not fast enough to create “Compulsory mixing”, so concrete produced dose not as high in quality or strength as other mixers.
Drum / tilt up and transit mixing trucks – Its slow, poor mixing action takes many revolutions to attain good homogeneity. It is critical on charging sequence, initial addition of water to wet blades, and removing deposit from previous batch. With incomplete discharge, it is difficult to clean out and maintain.
Ribbon/Spiral blade – The ‘old standard’ for precast and block plants. Its slow, poor mixing action takes many minutes for good mix. It is characterized by reliable performance, low maintenance cost, and non-compulsory action. For little end to end action, charging method and water entry is critical to avoid variation within discharged batch.