Precast concrete is installed in existing structures. It is moved by factory staff or those on-site and can cast stone, gravel, and sand. When you pre-cast, there are many advantages and minor disadvantages. The secondary disadvantage is that the process can take quite a long time. The positives outweigh this particular drawback and make pre-casting an excellent option to consider.https://www.evernote.com/shard/s546/sh/8024e7aa-3b67-6734-58d7-f9a1a5a44268/a9b9f2e7c91a6740fe3593c9c60142ff