HOLLOW BLOCKS
Hollow and dense cement
concrete blocks are known as hollow blocks. These have been developed as an
alternative to bricks. The products are widely used in construction activity.
The hollow blocks are made of cement, stone chips, stone dust and sand are not
only cheaper than bricks but have other specialties as well. These blocks have
more tensile strength, the walls constructed from these blocks act as thermal
insulators because of their hollowness.
Firstly cement, stone chips, sand, etc are mixed in the ratio of 1:6 or 1:12. This mixture is put in vibrator machine. A ratio of 1:3:6 (cement : sand : stone chips) confers higher strength, while a ratio of 1:5:6 can be employed for normal load bearing construction. The water to cement ratio is usually 0:4:1.
This is then poured into the
desired size mould. After 24 hours of drying, the blocks are put in water tank
for curing. The process of curing continues for two to three weeks to give the
blocks compression strength. The blocks are used in construction process after
drying.
Cement concrete blocks can be
solid (dense) or hollow. Besides different sizes and designs can be given to
the blocks. The blocks are made in the sizes of 12x8x4"; 12x8x3";
12x8x6", etc.
Advantages of
Hollow Blocks
Hollow blocks are more durable
It has high fire resistance
It has insulation and sound absorption property
Economical in construction
Rapid construction more wall is laid per man hour than in
other types
Hollow units are relatively large in size. Hence minimum joints
results in savings in mortar
It can be used for both load bearing and non load bearing
walls.
It has an attractive appearance, and adaptable to any
style of architecture.
E-mail: seagraz@gmail.com
