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Cinder blocks can be glued together.
Cinder blocks are the foundation of many homes and buildings. They are typically installed with mortar between them. This mix holds them in place and once the mortar dries, they do not move at all. Cinder blocks can also be glued together with a strong construction adhesive. While this is not ideal for building houses, it can be done for smaller crafts and projects you are doing with the cinder blocks.
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Set the cinder blocks you will be gluing to one another down on a flat surface and wipe them off with a concrete broom. Dust them off completely to ensure they are clean and there is no dirt and debris in the way when you apply the construction adhesive.
Slide a tube of construction adhesive into a caulk gun. Press it down by hand and lock it into place. Cut off the tip of the nozzle at a 45 degree angle with a utility knife. The angle will allow for more adhesive to squirt out when you are spreading it over the cinder blocks.
Set the first block down on a flat surface and begin squirting construction adhesive over the top. Press down on the trigger and release the adhesive. Run a 1/4-inch bead around the entire perimeter of the cinder block. Set the second cinder block directly on top of the first and press down firmly so it can adhere in place.
Run your hands over the entire cinder block and add construction adhesive to the top of it just like it was applied in the previous step. Press the third block down into place and install it in the same manner. Follow the identical pattern until you glue the desired amount of blocks.