construction material | building material
[ chapter 2]
- Bricks
- Timber and other materials
- modern material
construction material and building material
Bricks:
bricks are artificially made rectangular blocks, made from clay. clay is moulded to form rectangular blocks of standard size,which are dried and late burnt to a higher temperature to make them dense and compact.
standard size of brick 19 cm 9cm 9 cm. when place with mortar becomes 20cm 10cm 10cm. weight of such a brick is 3 kg.
Few properties of bricks:
- colour
- shape
- texture
- strength, soundness, hardness.
composition :
- silica 50- 60%
- alumina 20-30%
- lime 10%
- magnesia <1%
- ferric oxide<7%
- carbon dioxide<1%
Various Method of Moulding Bricks:
HAND MOULDING:
- ground moulding
- table moulding
- plastic method
- dry process method
Timber and other material:
Timber denotes wood, which is suitable for building or carpentry or various other other engineering purposes like construction of doors, windows, roofs, partitions, beams, posts, cupboard, shelves.
Timber are classified:
- mode of growth
- modulus of elasticity
- durability
- grading
- availability
Few properties of timber:
colour, odour, soundness, texture, grains, density, hardness, workability, durability, defects
Seasoning of timber:
this is process by which moisture content in a freshly cut tree is reduced to a suitable level.
by doing so the durability of timer is increased.
other materials:
- plywood
- steel
- veneers
- bitumen
- aluminium
- thermocole
Modern materials:
ceramics to polycrystalline materials and products formed by baking natural clays and mineral admixtures at a high temperature and also by sintering oxides of various metals and inorganic substances having high melting point.
classification of ceramic materials:
- clay products.
- refractories.
- glasses.
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