CMUs are manufactured from a mixture of Portland cement, aggregates (including sand or crushed stone), and water. The ingredients are mixed together to form a slurry which is poured into molds. The molds can be either pre-formed block shapes or have form liners that give the CMU a finished look on one or both sides. Once the molds are filled, they are vibrated to remove air pockets and settle the concrete. After a short curing period, the blocks are removed from the molds and allowed to cure further before being packaged for shipping. CMUs can also be installed “dry,” but this method is often not recommended because it can lead to improper installation or cracking of the block.
CMUs are extremely versatile and can be used in many different applications, from residential construction to large commercial projects. They can be colored, stained, molded into custom shapes, scored with decorative patterns, and even fireproofed if necessary. The blocks can also be designed to provide superior thermal performance and sound insulation. With their cost-effectiveness, durability, and wide range of applications, CMUs are an excellent choice for many projects.