What Are Building Materials Used For
Building materials are all kinds of materials used in building engineering.There are a wide variety of building materials, which can be roughly divided into:
(1) inorganic materials, including metallic materials (including ferrous metal materials and non-ferrous metal materials) and non-metallic materials (such as natural stone materials, burnt earth products, cement, concrete and silicate products, etc.).
(2) organic materials, including plant materials, synthetic polymer materials (including plastics, coatings, viscose) and asphalt materials.
(3) composite materials, including asphalt concrete, polymer concrete, etc., generally composed of inorganic non-metallic materials and organic materials.
1, coarse aggregate coarse aggregate should choose reasonable gradation, good grain shape, uniform and solid texture, line swelling coefficient small clean gravel, can also be used broken pebble or pebble, should not be used sandstone gravel.
2, fine aggregate fine aggregate should choose reasonable gradation, uniform texture solid, low water absorption, small void rate of clean natural coarse river sand, but also can choose the artificial sand produced by the special unit, should not use mountain sand, shall not use sea sand.
3, cement cement is a powder hydraulic inorganic cementing material.Add water after mixing in the air or in water hardening, and sand, stone and other materials firmly cemented together.The concrete made by cementing crushed stone with it not only has higher strength after hardening, but also can resist the erosion of fresh water or brine.
4. Fly ash is the fine ash collected from the flue gas after coal combustion. Fly ash is the main solid waste discharged from coal-fired power plants.It can reduce environmental pollution and waste utilization to use fly ash's cementitious part instead of cement in construction engineering.
5, the admixture is mainly high - efficiency alkali water agent, used to improve the performance of concrete.
6, ore powder will be crushed ore processing products, used to improve the performance of concrete.