Notes

Types Of Concrete Blocks Or Concrete Masonry Items Utilized In Construction Engineering





Concrete block masonry which called concrete masonry unit (CMU) have advantages over brick and stone masonry.





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

The most popular height and width of 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 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.

Kinds of Concrete Blocks or Concrete Masonry Units

Dependant on the dwelling, shape, size and manufacturing processes concrete blocks are mainly classified into 2 types plus they are:

Solid concrete blocks
Hollow concrete Blocks


Solid Concrete Blocks

Solid concrete blocks can be used, that happen to be heavy in weight and made of dense aggregate. These are very strong and offers good stability to the structures. So for giant work of masonry like for load bearing walls these solid blocks are preferable. They come in large sizes in comparison to bricks. So, it will require a shorter 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 part of hollow bricks should be a lot more than 50%. The hollow part might be divided into several components based on our requirement. They may be made of lightweight aggregates. They may be light-weight blocks and easy to set up.

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 used in the ends or corners of masonry. The ends might be window or door openings etc. these are arranged in a fashion that their plane end visible to the outside as well as other end is locked with the stretcher block.

Concrete Corner Blocks
Corner blocks are employed on the ends or corners of masonry. The ends could possibly be window or door openings etc. they're arranged in a way that their plane end visible out along with other end is locked with all the stretcher block.

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

Jamb Concrete Blocks
Jamb blocks are used if you have an elaborated window opening from the wall. These are linked to stretcher and corner blocks. For your provision of double hung windows, jamb blocks are extremely beneficial to provide space for that casing folks window.

Partition Concrete Block
Partition concrete blocks are generally used to build partition walls. Partition blocks have larger height than its breadth. Hollow part is divided into 2 to 3 components in the event of partition blocks.

Lintel Blocks
Lintel block or beam block is used when it comes to provision of beam or lintel beam. Lintel beam is normally provided in the top percentage of doors and windows, which bears the load received from top. Concrete lintel blocks have deep groove over the amount 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 has a frog on its top along with header and stretcher like frogged brick. This frog will helps the block to hold mortar and also to develop the strong bond with top laying block.

Bullnose Concrete Block
Bullnose blocks are similar to corner blocks. Their duties also same however, if we want rounded edges at corner bullnose bricks are preferred.


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