Concrete Block is primarily used as a building material in the construction of walls. It is sometimes called a Concrete Masonry Unit (CMU). A Concrete Block is one of several precast concrete products used in construction. The term precast refers to the fact that the blocks are formed and hardened before they are brought to the job site. Advantages: Highly Durable; the good concrete compacted by high pressure and vibration gives substantial strength to the block. Proper curing increase compressive strength of the blocks. Low Maintenance; color and brilliance of masonry outdoor elements. Load Bearing; strength can be specified as per the requirement. Fire Resistant. Provide thermal and sound insulation; the air in hollow of the block does not allow outside heat or cold in the house, so it keeps house cool in summer and warm in winter. Economical; no additional formwork or any special construction machinery is required for reinforcing the hollow block masonry. Environment Friendly.