Every panel has to be reinforced with a steel cage. This gives the panel its strength.  While a lot of the steps are repetitive, each cage is unique, and must be put together according to exact measurements. Although concrete is very strong in compression, it is not very strong in tension.  The steel bars take the tension loads while the concrete takes most of the compressive loads that the panel will experience during its lifetime.  This cage will be placed in a form similar to the ones below.

After the steel cage has been installed into the form, the embeds and cable loops are installed.

These forms are ready for concrete.  Note the bulkheads on the near end of the photograph. These can be adjusted to vary the length of the panel without having to build a new bed.

The concrete is batched and loaded into a 1.25 cubic yard bucket.  The bucket is then carried by the overhead crane to the form.  After the concrete is placed, it is vibrated to remove air bubbles.  

The next step is to finish the backside of the panel. Typically, a float is used. However, if the back of the panel is going to be exposed, a steel trowel finish can be used.  

Once the panel has cleared the form it will be moved to a trailer at the other end of the plant. It is then taken outside and allowed to cure before being finished.

These panels have cured overnight and are ready to be finished.

Sandblasting is the most common finishing process.  Others include an acid wash, an exposed aggregate or retarded finish, or simply leaving a form finish.  Each finish gives the panel a different appearance.

After the finishing process is completed, the panels are stored in a rack until it is time to ship them to the jobsite.

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