Properties of foamed concrete

Lightweight

Foamed concrete has a low density. In practical applications, the density grade of common foamed concrete is 180~500kg/m3. In recent years, ultra-light foamed concrete with lower density has Concrete has also begun to appear, but it has not yet been widely used in construction projects. In actual engineering, the density of foamed concrete can be reduced to 150~350kg/m3. Compared with clay bricks, the density is only 1/3~1/10 of clay bricks, and its density is only equivalent to 1/5~ of ordinary cement concrete. 1/10.

Due to the low density of foamed concrete, applying it to the internal and external walls, floors, floors, columns and other parts of the building can reduce the weight of the building by about 25%, and some can even be used The weight is reduced by up to 30% to 40%. Therefore, the rational use of foamed concrete in construction projects can greatly reduce project costs while ensuring the durability of the building, and has significant economic benefits and broad market prospects.

Good thermal insulation performance

The reason why foamed concrete has good thermal insulation performance is determined by its internal structure. Observing the internal structure of foamed concrete, we can find that the interior of foamed concrete is filled with a large number of closed, uniform, and small circular pores. These pores can fix air to the greatest extent, so the thermal conductivity of the product is low and it has good thermal insulation properties. This excellent thermal performance of foamed concrete is not available in ordinary concrete. Foamed concrete with a density range of 150 to 350kg/m3 has a thermal conductivity range of 0.045 to 0.06w/(m·k). If this kind of foamed concrete is widely used in roofing materials and wall materials of buildings, it will produce good energy-saving effects.

Good sound insulation and fire resistance

As a porous material, foamed concrete contains a large number of closed pores inside, so it has good sound insulation performance. Therefore, foamed concrete can be widely used in building floors, sound insulation panels on highways, and top floors of underground buildings as sound insulation layers. At the same time, foamed concrete also has the properties of general inorganic materials, that is, it is non-combustible and has good fire resistance. A large amount of research data at home and abroad shows that when the compressive strength of foamed concrete with a dry density in the range of 150 to 350kg/m3 is in the range of 2.5 to 7.5MPa, the fire resistance limit of the foamed concrete can reach 2.7 hours, and the sound insulation performance It can reach 20db and its impact resistance can reach 100 times. It is a high-quality sound insulation and refractory material that can be vigorously promoted.

Good seismic performance

Due to its special porous structure, foamed concrete has a smaller density, lighter mass, and lower elastic modulus. These characteristics make the foam concrete structure bear less seismic force when it is subjected to seismic load, and the transmission speed of shock waves is much slower than that of ordinary concrete structures. According to the principle of vibration theory, the longer the self-seismic period of a building structure, the faster it will absorb impact energy. Therefore, foamed concrete has excellent shock absorption effect. Appropriate application of foam concrete in specific parts of construction projects can effectively increase the seismic performance of buildings and enhance the safety and solidity of buildings in earthquakes.

In addition to the above excellent properties [5-6], foamed concrete also has good pumpability during cast-in-place construction, strong waterproofing ability, and good impact energy absorption performance. During the production process A large amount of industrial waste can be added into the concrete, which not only effectively utilizes resources, turns waste into treasure, and is beneficial to environmental protection, but also greatly reduces the cost of foamed concrete.

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