Kinds Of Concrete Blocks Or Concrete Masonry Pieces Present In Construction
Concrete block masonry and this is known as concrete masonry unit (CMU) have advantages over brick and stone masonry.
Concrete blocks are made in required shape and sizes which could be solid or hollow blocks.
The regular 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 can be used to arrange 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.
Varieties of Concrete Blocks or Concrete Masonry Units
Based on the structure, shape, size and manufacturing processes concrete blocks are mainly classified into 2 types and they are:
Solid concrete blocks
Hollow concrete Blocks
Solid Concrete Blocks
Solid concrete blocks are commonly used, which are heavy in weight and produced from dense aggregate. They may be very strong and offers good stability for the structures. So for giant work of masonry like for load bearing walls these solid blocks are preferable. They are available in large sizes compared to bricks. So, it will require much 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 section of hollow bricks needs to be a lot more than 50%. The hollow part might be split up into several components based on our requirement. They may be produced from lightweight aggregates. These are lightweight 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 employed in the ends or corners of masonry. The ends might be window or door openings etc. these are arranged in a way that their plane end visible facing outward along with other end is locked with the stretcher block.
Concrete Corner Blocks
Corner blocks are widely-used in the ends or corners of masonry. The ends could be window or door openings etc. they are arranged in a way that their plane end visible facing outward and also other end is locked with the stretcher block.
Concrete Pillar Blocks
Pillar block is additionally referred to as double corner block. Generally they are used when two ends in the corner are visible. In the case of piers or pillars these blocks are widely used.
Jamb Concrete Blocks
Jamb blocks are utilized if you find an elaborated window opening from the wall. They are attached to stretcher and corner blocks. For that provision of double hung windows, jamb blocks are extremely beneficial to provide space for that 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 two or three components in the event of partition blocks.
Lintel Blocks
Lintel block or beam block is utilized when considering provision of beam or lintel beam. Lintel beam is normally provided at the top area of doors and windows, which bears the burden via top. Concrete lintel blocks have deep groove across the length of block as shown in figure. After placing the blocks, this groove is full of concrete together with reinforcement.
Frogged Brick Blocks
Frogged brick block posesses a frog on its top together with header and stretcher like frogged brick. This frog will helps the block to hold mortar also to provide 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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