Concrete block masonry which is also known as concrete masonry unit (CMU) have advantages over brick and stone masonry.

Concrete blocks are produced in required shape and sizes and these could be solid or hollow blocks.

The regular size of concrete blocks is 39cm x 19cm x (30cm or 20 cm or 10cm) or 2 inch, 4 inch, 6 inch, 8 inch, 10 inch and 12-inch unit configurations.

Cement, aggregate, water is employed to prepare concrete blocks.

The cement-aggregate ratio in concrete blocks is 1:6. Aggregate used is of 60% fine aggregate and 40% coarse aggregate.

Their Minimum strength is approximately 3N/mm2. ASTM C-90-91 specifies the compressive strength requirements of concrete masonry units.

Types of Concrete Blocks or Concrete Masonry Units

Based on the structure, shape, size and manufacturing processes concrete blocks mostly are classified into 2 types and they are generally:

Solid concrete blocks

Hollow concrete Blocks

Solid Concrete Blocks

Solid concrete blocks are normally used, that happen to be heavy in weight and constructed from dense aggregate. They may be very strong and provides good stability towards the structures. So for giant work of masonry like for load bearing walls these solid blocks are preferable. These come in large sizes in comparison with bricks. So, it will require a shorter time to make concrete masonry than brick masonry.

Hollow Concrete Blocks

Hollow concrete blocks contains void area more than 25% of gross area. Solid section of hollow bricks ought to be over 50%. The hollow part could possibly be split up into several components determined by our requirement. They are constructed from lightweight aggregates. They are transportable blocks and easy to setup.

Types of Hollow Concrete Blocks:

Stretcher block

Corner block

Pillar block

Jamb block

Partition block

Lintel block

Frogged brick block

Bullnose block

Concrete Stretcher Blocks

Corner blocks are utilized with the ends or corners of masonry. The ends may be door or window openings etc. these are arranged in a fashion that their plane end visible external and other end is locked using the stretcher block.

Concrete Corner Blocks

Corner blocks are utilized at the ends or corners of masonry. The ends could be window or door openings etc. they may be arranged in a manner that their plane end visible facing outward and also other end is locked together with the stretcher block.

Concrete Pillar Blocks

Pillar block can also be recognized as double corner block. Generally these are generally used when two ends with the corner are visible. In case of piers or pillars these blocks are traditionally used.

Jamb Concrete Blocks

Jamb blocks are widely-used if you have an elaborated window opening inside the wall. They are attached to stretcher and corner blocks. To the provision of double hung windows, jamb blocks are extremely necessary to provide space to the casing members of window.

Partition Concrete Block

Partition concrete blocks are usually utilized to build partition walls. Partition blocks have larger height than its breadth. Hollow part is divided into 2 to 3 components in the case of partition blocks.

Lintel Blocks

Lintel block or beam block can be used for the purpose of provision of beam or lintel beam. Lintel beam is normally provided at the top part of doors and windows, which bears the stress received from top. Concrete lintel blocks have deep groove down the period of block as shown in figure. After placing the blocks, this groove is stuffed with concrete in addition to reinforcement.

Frogged Brick Blocks

Frogged brick block contains a frog on its top as well as header and stretcher like frogged brick. This frog will helps the block to carry mortar also to develop the strong bond with top laying block.

Bullnose Concrete Block

Bullnose blocks are like corner blocks. Their duties also same however when we would like rounded edges at corner bullnose bricks are preferred.

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