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

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

The most popular sized concrete blocks is 39cm x 19cm x (30cm or 20 cm or 10cm) or 2 inch, 4 inch, 6 inch, 8 inch, Ten inch 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 about 3N/mm2. ASTM C-90-91 specifies the compressive strength requirements of concrete masonry units.

Forms of Concrete Blocks or Concrete Masonry Units

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

Solid concrete blocks

Hollow concrete Blocks

Solid Concrete Blocks

Solid concrete blocks are generally used, that are heavy in weight and manufactured from dense aggregate. They may be quite strong and gives good stability towards the structures. So for large work of masonry like for load bearing walls these solid blocks are preferable. They come in large sizes in comparison to bricks. So, it requires less time to make concrete masonry than brick masonry.

Hollow Concrete Blocks

Hollow concrete blocks contains void area in excess of 25% of gross area. Solid division of hollow bricks ought to be a lot more than 50%. The hollow part could possibly be split up into several components depending on our requirement. They are manufactured from lightweight aggregates. They are transportable blocks and straightforward to install.

Varieties 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 on the ends or corners of masonry. The ends might be door or window openings etc. they are arranged in ways that their plane end visible to the outside and other end is locked with all the stretcher block.

Concrete Corner Blocks

Corner blocks are employed with the ends or corners of masonry. The ends might be window or door openings etc. they’re arranged in a fashion that their plane end visible out and also other end is locked with all the stretcher block.

Concrete Pillar Blocks

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

Jamb Concrete Blocks

Jamb blocks are utilized should there be an elaborated window opening in the wall. These are attached to stretcher and corner blocks. For your provision of double hung windows, jamb blocks are incredibly necessary to provide space to the casing people in window.

Partition Concrete Block

Partition concrete blocks are generally employed to build partition walls. Partition blocks have larger height than its breadth. Hollow part is split into 2 to 3 components in case there is partition blocks.

Lintel Blocks

Lintel block or beam block can be used with regards to provision of beam or lintel beam. Lintel beam is mostly provided in the top area of doors and windows, which bears the burden coming from top. Concrete lintel blocks have deep groove over the period of block as shown in figure. After placing the blocks, this groove is stuffed with concrete together with reinforcement.

Frogged Brick Blocks

Frogged brick block contains a frog on its top together with header and stretcher like frogged brick. This frog will helps the block to support mortar and also to get the strong bond with top laying block.

Bullnose Concrete Block

Bullnose blocks are similar to corner blocks. Their duties also same however when we’d like rounded edges at corner bullnose bricks are preferred.

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