How to Make Cement Blocks

Put your cement block mold together. Using the plywood planks, nails, and hammer or gun, create a standard block-sized mold 300mm long, 200mm wide, and 150mm thick. Do your work in a large space so you have mobility and open air if possible. Put your mask on to prevent inhalation of sand and gravel particles once you begin the cement mixture.

Mix the cement in a large bucket, using a metal or thick wooden dowel. The mixture ratio should be one part cement, two parts sand, and three parts gravel. Use your hands to help mix as well, but wear rubber gloves.

Pour very small amounts of water into the mixture as you stir. Do not add all the water at once because it will water down the mixture and you'll have to start over again or keep adding more of the sand or gravel. Keep stirring as you pour the water. Once it is well-blended, it should be the consistency of a very thick, lumpy paste.

Pour the mixture into the cement block mold. It will be easier to scoop the cement out of the large bucket with a smaller bucket or cup.

Level off the top of the cement, using the trowel. This is a flat metal tool used to evenly and smoothly lay paste and any other thick element. Allow the cement block to harden for 24 hours, and then remove the wooden molding around it.

Set the block in an extra-large bucket of water to cure for about two weeks. The curing process gives the cement compressive abilities necessary for supporting other bricks and building materials.