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The principal work of cement masons, also known as concrete masons, is to put into place and then smooth and finish concrete surfaces in a variety of different construction projects. Sometimes they add colors to the concrete to change its appearance or chemicals to speed up or slow down the amount of time that the concrete takes to harden. They use various tools to create specified surface textures on fresh concrete before it sets. They may also fabricate beams, columns, or panels of concrete.