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

Concrete blocks are made in required shape and sizes that may be solid or hollow blocks.

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

Cement, aggregate, water is utilized to get ready 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 around 3N/mm2. ASTM C-90-91 specifies the compressive strength requirements of concrete masonry units.

Kinds of Concrete Blocks or Concrete Masonry Units

Depending upon the dwelling, shape, size and manufacturing processes concrete blocks are mainly classified into 2 types and they are generally:

Solid concrete blocks

Hollow concrete Blocks

Solid Concrete Blocks

Solid concrete blocks are commonly used, which can be heavy in weight and produced from dense aggregate. These are very strong and provides good stability for the structures. So for large work of masonry like for load bearing walls these solid blocks are preferable. They are available in large sizes when compared with bricks. So, it will take less time to develop concrete masonry than brick masonry.

Hollow Concrete Blocks

Hollow concrete blocks contains void area greater than 25% of gross area. Solid area of hollow bricks must be a lot more than 50%. The hollow part may be split up into several components according to our requirement. They may be produced from lightweight aggregates. They’re transportable blocks and easy to put in.

Kinds 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 employed on the ends or corners of masonry. The ends may be window or door openings etc. they’re arranged in a fashion that their plane end visible external along with other end is locked together with the stretcher block.

Concrete Corner Blocks

Corner blocks are widely-used with the ends or corners of masonry. The ends could be window or door openings etc. they’re arranged in a way that their plane end visible out along with other end is locked using the stretcher block.

Concrete Pillar Blocks

Pillar block can also be called as double corner block. Generally they’re used when two ends of the corner are visible. In case there is piers or pillars these blocks are trusted.

Jamb Concrete Blocks

Jamb blocks are widely-used when there is an elaborated window opening from the wall. They may be linked to stretcher and corner blocks. To the provision of double hung windows, jamb blocks are extremely useful to provide space to the casing folks window.

Partition Concrete Block

Partition concrete blocks are likely to be employed to build partition walls. Partition blocks have larger height than its breadth. Hollow part is split into two or three components in case of partition blocks.

Lintel Blocks

Lintel block or beam block is employed when it comes to provision of beam or lintel beam. Lintel beam is generally provided on top part of doors and windows, which bears the strain originating from top. Concrete lintel blocks have deep groove along the period of block as shown in figure. After placing the blocks, this groove is filled with concrete in addition to reinforcement.

Frogged Brick Blocks

Frogged brick block includes a frog on its top in addition to header and stretcher like frogged brick. This frog will helps the block to support mortar also to develop the strong bond with top laying block.

Bullnose Concrete Block

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

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