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

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

The most popular 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 can be used 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 about 3N/mm2. ASTM C-90-91 specifies the compressive strength requirements of concrete masonry units.

Kinds of Concrete Blocks or Concrete Masonry Units

Dependant on the dwelling, shape, size and manufacturing processes concrete blocks are generally 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 made of dense aggregate. They’re very strong and supplies good stability for the structures. So for large work of masonry like for load bearing walls these solid blocks are preferable. One can choose from large sizes compared to bricks. So, it will require a shorter period to create concrete masonry than brick masonry.

Hollow Concrete Blocks

Hollow concrete blocks contains void area more than 25% of gross area. Solid area of hollow bricks should be greater than 50%. The hollow part might be split up into several components determined by our requirement. These are produced from lightweight aggregates. These are transportable blocks and straightforward to put in.

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 widely-used at the ends or corners of masonry. The ends could possibly be door or window openings etc. they may be arranged in a fashion that their plane end visible to the outside as well as other end is locked with all the stretcher block.

Concrete Corner Blocks

Corner blocks are employed in the ends or corners of masonry. The ends could be door or window openings etc. these are arranged in a way that their plane end visible facing outward and also other end is locked using the stretcher block.

Concrete Pillar Blocks

Pillar block is also known as double corner block. Generally they are used when two ends in the corner are visible. In case of piers or pillars these blocks are widely used.

Jamb Concrete Blocks

Jamb blocks are utilized if you find an elaborated window opening in the wall. They are connected to stretcher and corner blocks. For your provision of double hung windows, jamb blocks are extremely necessary to provide space for that casing individuals 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 split into two to three components in case of partition blocks.

Lintel Blocks

Lintel block or beam block is employed when considering provision of beam or lintel beam. Lintel beam is generally provided in the top percentage of doors and windows, which bears the strain received from top. Concrete lintel blocks have deep groove across the amount of block as shown in figure. After placing the blocks, this groove is full of concrete as well as 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 and enjoy the strong bond with top laying block.

Bullnose Concrete Block

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

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