The main features and application range of lightweight foam concrete

First, the main features of lightweight foam concrete:

1, good insulation performance, save energy

Compared to aerated concrete, lightweight foam concrete has a 40 to 60% lower thermal conductivity, 70% lower thermal conductivity than ceramsite concrete, and 40 to 60% lower thermal conductivity than expanded perlite.

2, light weight, high strength, reduce the building load

The dry bulk density of lightweight foam concrete is generally 180-300kg/m3 (up to 1200 kg/m3 with load-bearing requirements), which is equivalent to about 1/10 to 1/3 of that of clay bricks, and lower than that of ordinary lightweight aggregates. Concrete. The strength of foamed concrete is comparable to that of aerated concrete and ceramsite concrete, and its strength is 2 to 3 times higher than that of expanded perlite.

3, Simplify the construction process, shorten the construction period, use a long service life

In the application of roofing system, light-weight foam concrete is constructed in the form of cast-in-situ. The slope layer, leveling layer, insulation layer, waterproof layer (optional, made of waterproof foam), protective layer, etc. will be found once (integrated). Simplified the roof construction process, compared with the construction period required for general roof construction, it can save more than 50% of the construction period. The raw materials are mainly the same physical properties as the building structure layer such as cement, gravel, etc., and they form a whole with the concrete roof, so the service life is long and the service life of cement concrete is the same.

4, good water resistance

Cast-in-place lightweight foam concrete has less water absorption, relatively independent closed bubbles and good integrity, making it have a certain waterproof performance. Water repellent can also be added to make it waterproof concrete. TH lightweight foam concrete has 50% lower water absorption compared to aerated concrete and 60% lower water absorption compared to ceramsite concrete

5, low elastic shock absorption, good shock resistance

The porosity of lightweight foam concrete gives it a low modulus of elasticity so that it has a good absorption and dispersion effect on the impact load; in addition, the smaller the load of the foundation, the stronger the shock resistance, therefore, the use of TH foam The anti-seismic performance of concrete will increase.

6, sound insulation, excellent fire resistance

Lightweight foam concrete contains a large number of independent air bubbles and is evenly distributed. The sound absorption capacity is 0.09 to 0.19%, which is 5 times that of ordinary concrete and has the function of effective sound insulation. Does not burn, fire resistance is greater than three hours, the fire resistance of other insulation materials can not be achieved.

7, integrity

Lightweight foam concrete can be cast on site, tightly integrated with the main structural layer and can be used without roofing seams and vent pipes.

8, environmental protection

The main raw materials required for lightweight foam concrete are cement and foaming agent. The foaming agent is neutral and does not contain harmful substances such as benzene and formaldehyde, thus avoiding environmental pollution and hidden fire hazards.

Second, the scope of application of lightweight foam concrete

Lightweight foam concrete in lightweight lightweight concrete is also called foamed lightweight soil, or foam concrete, also known as foamed concrete. Because it is a new material, there are no industry and national regulations for the time being, so the name is not yet uniform. This material is suitable for building roofs looking for slopes, thermal insulation; floor heating and insulation; wall insulation, foam concrete blocks; in the framework of the structure used as heat-insulated wall or made of sheet steel composite wallboard; compensation for foundations, Filling layers for roads, bridges, tunnels, and large-scale structures; retaining walls for highway slopes, roadbeds, riverbanks, and harbors; garden products made of lightweight rockery, bonsai, and imitation wood materials; cast-in-place insulating layers for kiln and spray insulation layer Refractory insulation bricks and other refractory applications; lightweight foam ceramic products and so on. Filling of buildings (including the filling between the roof beams of the basement, the adjustment and filling of the basement when the structure of the basement is not uniform, the filling of equipment pits), the floor insulation layer (floor heating) cushion and other aspects.