What is the primary function of the hollow cores in many types of CMUs?

The primary function of the hollow cores in many types of Concrete Masonry Units (CMUs) is to provide weight reduction and reinforcement. The design of CMUs with hollow cores allows them to be significantly lighter than solid masonry units, making them easier to handle and install on construction sites. This reduction in weight does not compromise structural integrity, as the holes can be filled with reinforcing materials like concrete or steel bars, thereby enhancing the strength and load-bearing capacity of the units.

Additionally, the hollow cores can aid in various construction practices, such as accommodating plumbing and electrical conduits, as well as reducing the amount of raw materials needed, which is beneficial for both economic and environmental considerations. While insulation and sound absorption are important for building performance, the primary role of the hollow cores is fundamentally tied to structural advantages through weight management and the capacity for reinforcement.