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

Concrete blocks are made in required shape and sizes and the might be solid or hollow blocks.

The normal 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 ” 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 about 3N/mm2. ASTM C-90-91 specifies the compressive strength requirements of concrete masonry units.

Forms of Concrete Blocks or Concrete Masonry Units

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

Solid concrete blocks

Hollow concrete Blocks

Solid Concrete Blocks

Solid concrete blocks can be used, which can be heavy in weight and made of dense aggregate. They’re strong and supplies good stability on the structures. So for large work of masonry like for load bearing walls these solid blocks are preferable. These come in large sizes compared to bricks. So, it will take much less time to develop concrete masonry than brick masonry.

Hollow Concrete Blocks

Hollow concrete blocks contains void area in excess of 25% of gross area. Solid area of hollow bricks should be a lot more than 50%. The hollow part could be split into several components determined by our requirement. They may be produced from lightweight aggregates. They are lightweight blocks and easy to setup.

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 used with the ends or corners of masonry. The ends might be door or window openings etc. these are arranged in a manner that their plane end visible external and other end is locked using the stretcher block.

Concrete Corner Blocks

Corner blocks are used on the ends or corners of masonry. The ends could possibly be window or door openings etc. they may be arranged in ways that their plane end visible out and other end is locked with all the stretcher block.

Concrete Pillar Blocks

Pillar block is additionally referred to 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 widely used.

Jamb Concrete Blocks

Jamb blocks are utilized if you find an elaborated window opening inside the wall. They are attached to stretcher and corner blocks. For that provision of double hung windows, jamb blocks are extremely necessary to provide space to the casing members of 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 split into 2 to 3 components in the case of partition blocks.

Lintel Blocks

Lintel block or beam block is utilized when considering provision of beam or lintel beam. Lintel beam is mostly provided on the top portion 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 stuffed with concrete as well as reinforcement.

Frogged Brick Blocks

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

Bullnose Concrete Block

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

More details about con ke thep san browse this web portal