Foamed cement insulation material foaming cement, the material that was first introduced in Germany was introduced in China around 1980. The foaming agent is fully foamed by the foaming system of the foaming machine, and the foam and the cement slurry are uniformly mixed, and then the pumping system of the foaming machine is used for the cast-in-place construction or the mold forming, and the natural curing station is adopted. A new type of lightweight thermal insulation material containing a large number of closed pores. It is a bubble-like insulation material, which is characterized by the formation of closed foam holes in the concrete to make the concrete lighter and insulated.
Characteristics
1) Insulation: The thermal conductivity is 0.06-0.28W/(MK), and the thermal resistance is about 10-20 times that of ordinary concrete.
2) Light weight: The dry bulk density is 300-1600KG/M3, which is equivalent to about 1/5~1/8 of ordinary cement concrete, which can reduce the overall load of the building.
3) Integrity: It can be cast on site, and it is closely integrated with the main project, and no need to leave the gap and vent pipe.
4) Low-elastic shock absorption: The porosity of the foamed cement gives it a low modulus of elasticity, so that it has a good absorption and dispersion effect on the impact load.
5) Sound insulation: Foamed cement contains a large number of independent bubbles, and the distribution is even, the sound absorption capacity is 0.09-0.19%, which is 5 times that of ordinary concrete, and has the function of effective sound insulation.
6) Compressiveness: The compressive strength is 0.6-25.0 MPA.
7) Water resistance: The cast-in-place foaming cement has less water absorption, relatively independent closed air bubbles and good integrity, so that it has certain waterproof performance.
8) Durability: same as the main engineering life.
9) Simple construction: only the cement foaming machine can be used for automatic operation, and the long-distance transportation with a vertical height of 200 meters can be realized, and the workload is 150-300M3/working day.
10) Production processability: Foamed cement can not only be produced into various products in the factory, but also can be constructed on site, directly cast into roof, floor and wall, and can be sawed, planed, nailed and drilled. Hole and other processing.
11) Environmental protection: The raw materials required for foaming cement are cement and foaming agent. The foaming agent is neutral and contains no harmful substances such as benzene and formaldehyde, which avoids environmental pollution and fire hazards.
13) Fire resistance: Because the main raw material of foamed cement is cement, cement is completely resistant to inorganic materials.
12) Economic: The overall cost is low.
Application range
Foamed concrete is widely used in energy-saving wall materials because of its good characteristics, and has also been applied in other aspects. At present, the application of foam concrete in China is mainly the roofing foam concrete insulation layer cast-in-place, foam concrete surface block, foam concrete lightweight wall board, foam concrete compensation foundation. However, by making full use of the good characteristics of foam concrete, it can be expanded in the application field of construction engineering, speed up the progress of the project and improve the quality of the project, as follows:
(1) Used as a retaining wall. Mainly used as a rock wall for the port. The use of foam concrete as a lightweight backfill material behind the shore wall reduces vertical load and reduces lateral loads on the shore wall. This is because foam concrete is a rigid body with good bonding properties. It does not apply lateral pressure along the peripheral wall, the settlement is reduced, and the maintenance cost is reduced, thereby saving a lot of expenses. Foamed concrete can also be used to improve the stability of the embankment slope. It is used to replace part of the slope soil, which reduces the force that affects the stability of the slope due to the reduced mass.
(2) Construction of sports grounds and athletic track. The permeable malleable foam concrete with high drainage capacity is used as a lightweight foundation covered with gravel or artificial turf for use as a sports field. The density of foam concrete is 800-900kg/m3. Such sports fields can be used for hockey, football and tennis. Or a foamed concrete layer with a 0.05m thick porous asphalt layer and plastic layer can be used for track and field runways.
(3) As a sandwich member. Foamed concrete can be used as the inner core in the prefabricated reinforced concrete members, which makes it have good performance of light and high heat insulation. Foamed concrete with a density of 400 - 600 kg/m3 is usually used.
(4) Pipeline backfilling. Underground oil tanks, pipelines (with crude oil, chemicals), sewage pipes and other holes can easily lead to fires or landslides. Backfilling with foam concrete can solve these problems and cost less. The density of foam concrete depends on the diameter of the pipe and the water table, which is generally 600-1100kg/m3. (5) Lean concrete filling. Due to the use of flexible hoses, foam concrete has great workability and adaptability, so it is often used in lean concrete filling. If the insulation requirements are not very high, a lean concrete filling with a density of about 1200kg/m3 is used, and the average thickness is 0.05m. If the insulation is very high, a low-cost concrete filling with a density of 500kg/m3 is used. The average thickness is 0.1-0.2m.
(6) Roof slope. Foam concrete is used for roof slopes and has the advantages of light weight, fast construction speed and low price. The slope is generally 10 mm/m. The thickness is 0.03-0.2 m, and foam concrete having a density of 800 - 1200 kg/m3 is used.
(7) Support for the bottom of the tank. The foam concrete is cast on the bottom of the foot of the steel storage tank (with crude oil, chemicals), and if necessary, a convex foundation can be formed, which ensures that the support of the entire bottom of the tank is in an optimal stress state during welding. A continuous support allows the tank to be used as a thin bottom. At the same time, the convex foundation is also easy to clean. Foamed concrete is used at a density of 800-1000 kg/m3.
(8) Landscaping applications. The foamed cement is made into a bulk density of 600-1000kg/m3 and can be used as a handrail, rockery, stool, table, etc. in the garden.
(9) Others. Foamed concrete can also be used for insulation filling of firewalls, sound insulation floor filling, tunnel liner backfilling, and isolation of power supply and water pipelines.
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