Hollow Block

This large rectangular-shaped block is made by casting concrete out of cement (usually Portland cement) mixed with an aggregate made of different materials, depending on what density a particular block is intended to be. High-density hollow blocks, for instance use an aggregate made from fine gravel and sand. The hollow block is referred to as such because of its appearance, as it is manufactured with hollow centers designed to improve insulation and reduce its weight. The function of the holes in the block is to enable reinforced concrete (concrete and rebar or reinforced steel) to vertically run through it, thus making up for what it lacks in tensile strength. Insulated thermo blocks/fire resistant blocks have more than six times better insulation coefficient