In construction, what is a cement mixer?

Dry cement powder.

In construction, a cement mixer is a device used to mix and pour cement. The first thing that usually comes to mind at the mention of a cement mixer is a cement truck, which is a vehicle large enough to carry a heavy concrete mixer on its back. However, cement mixers can come in all sizes, and a typical lightweight portable cement mixer is about the size of a wheelbarrow.

A lightweight, portable concrete mixer is about the size of a wheelbarrow.

Cement mixing is a process that can require a certain degree of precision, and the cement mixer is a crucial component of the process. The main thing needed is the cement itself, which is a mixture of sand, water and aggregate (gravel) and a place to mix it all up. Precision comes into the process when mixing the exact amounts of these items. The most common cement mix used in a concrete mixer is known as Portland cement, a mix that has specific, easy-to-control properties such as drying time.

A cement mixer is a device used to mix and pour cement.

The most visible part of a concrete mixer is a rotating drum, which allows all parts of the cement to be mixed simultaneously and keeps the mix uniform. Inside this drum there are blades, which rotate and mix all the parts of the cement, and these are normally driven by a motor that is coupled to the drum. Once the concrete is ready to pour, there is a hole in the drum where the wet concrete easily comes out.

The most common cement mix used in a concrete mixer is known as Portland cement, a mix that has specific properties that are easy to control, such as drying time.

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The direction in which the blades rotate can be reversed when pouring wet cement and they act to pull it out rather than mixing it. Cement trucks can of course be a little more complex and most of the time the cement is mixed while the truck is on its way to a job. In the event of a delay, concrete mixer trucks are designed to add an agent to the cement mix to prevent it from drying out too quickly.

The size of the concrete mixer needed to complete a job mainly depends on the size of the job itself. Work that requires seven or eight cubic feet of cement or less can usually be completed with a portable cement mixer. Anything larger than that, however, will typically require the use of a concrete mixer truck, with some large jobs requiring much more.

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