Concrete Mixer Guide
A concrete mixer is a machine that automatically mixes mortar and concrete. It saves time and labor. Large concrete mixers allow you to mix larger batches than would be possible by hand. When you are planning a project involving concrete, then you should learn how to operate a concrete mixer, and how to choose the right one for your project. Does this Spark an idea?
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Sizes
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Concrete mixers come in a wide variety of sizes. Small portable mixers have a rated capacity of about 3 cubic feet. They are most suited for jobs like pouring fence post footings, making small slabs and patching broken concrete. Large portable mixers have a rated capacity of about 14 cubic feet. They can handle jobs such as making patios, sidewalks and driveways. The larger mixers are either tow-able or transported aboard trailers. The largest concrete mixers are cement trucks, and are used for the large jobs such as pouring large building foundations.
Power
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Some concrete mixers are powered by gas. Because they are independent of electrical outlets, they can be used at remote job sites where electrical hookups are unavailable. However, the gasoline makes them inappropriate for indoor use, as the fumes would build up to dangerous levels. Electric mixers are usable only indoors or at outdoor locations with electric outlets.
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Safety Considerations
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When using concrete mixers, it is important to observe certain safety precautions. Dry cement dust can irritate the eyes, nose, throat and lungs. It can cause chemical burns and even lung cancer. Even wet concrete can cause burns. It is important to wear alkali-resistant gloves, goggles, full-length pants, long sleeves and a face mask when loading the ingredients into the mixer, and to use it only in a well-ventilated area. Tie back long hair and do not wear jewelry, as both can become entangled in the mixer's moving parts.
Use
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Put about half the sand and gravel into the mixer with about three-quarters of the water. Add all the cement and start the mixer. Let it run until the ingredients are thoroughly blended. The add the rest of the sand and gravel, and mix that in. Add the remaining water as needed to achieve the desired consistency. Keep the opening of the mixer covered with a damp towel when it is not in use. This helps keep the concrete from drying out too quickly.
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