Foam concrete is to fully foam the foaming agent mechanically through the foaming system of the foaming machine, and evenly mix the foam and cement slurry. Then it is cast-in-place or molded through the pumping system of the foaming machine. After natural curing, it is formed into a new lightweight insulation material containing a large number of closed pores.
Foam concrete is a porous material with a large number of small, closed, evenly distributed pores inside. It has the characteristics of light weight, high strength, heat insulation, fire and sound insulation, water resistance and shock absorption, and is widely used in high-rise buildings. Building wall fabrication, insulation and lining projects.
With its good characteristics, foam concrete is widely used in energy-saving wall materials and has also been used in other aspects. Today, the main applications of foam concrete in our country are cast-in-place foam concrete insulation layers for roofs, foam concrete face blocks, foam concrete lightweight wall panels, and foam concrete compensation foundations.
The main function of foam concrete?
(1) Used as a retaining wall. Mainly used as a rock wall for the harbor. Foam concrete is used as a lightweight backfill material behind the quay wall to reduce the vertical intercept load and also reduce the lateral load on the quay wall.
(2) Build sports fields and track and field tracks. Use permeable foam concrete with strong drainage capabilities as a lightweight foundation, covered with gravel or artificial turf for a sports field.
(3) As a sandwich component. Foam concrete can be used as the inner core in prefabricated reinforced concrete components, which has good properties of light weight and high strength thermal insulation.
(4) Pipeline backfill. Abandoned underground oil tanks, pipelines (containing crude oil and chemicals), sewage pipes and other cavities can easily lead to fires or landslides. Using foam concrete backfill can solve these problems at a low cost.
2. Application of Foam Concrete
In recent years, our country has paid more and more attention to building energy conservation, and has also made remarkable achievements in the reform of wall materials. Foam concrete is now widely used Used in energy-saving wall materials.
1. Foam concrete blocks
Foam concrete blocks are the most widely used material in wall materials. In southern my country, in order to adapt to hot weather, foam concrete blocks with a density level of 900-1200kg/m3 are usually used as infill walls of frame structures by taking advantage of the block’s good thermal insulation performance, light weight and high strength. Harbin Jianzhu University developed polystyrene foam concrete blocks and used them in urban building construction. This kind of block is made of polystyrene foam as aggregate, cement and fly ash as cementing material, adding a small amount of admixtures, mixing, shaping and natural curing. Its specification is 200×200×200mm. It can be used It can be used as interior and exterior non-load-bearing wall materials, and can also be used as roof insulation materials.
2. Foam concrete lightweight wall panels
Currently, the main material used for building household and room partitions is grc lightweight wall panels, but due to the high price of its raw materials , affecting its widespread use in architecture. The China Academy of Building Materials Science used the GRC partition board production process combined with the research results of solid foam agents and foam cement to develop the production technology of fly ash foam cement lightweight wall panels and has been applied.
3. Foam concrete compensation foundation
Due to the difference in self-weight of each part of the building group, free settlement differences will occur during the construction process. During the building design process, it is required to The foundation of the lower self-weight part must be filled with soft materials. Foam concrete meets these requirements and is often used as a compensation foundation.
4. New progress in application abroad
In developed countries, the good characteristics of foam concrete have been fully utilized. Because foam concrete is a rigid body with good bonding properties, it has been used as the rock wall of the port. At the same time, permeable foam concrete with strong drainage capacity is used to build sports fields and track and field tracks. There are also a series of applications where foam concrete is used as sandwich components, composite wall panels, lean concrete filling, pipeline backfilling, storage tank foot support, etc. I believe that with the development of globalization, in the near future, foam concrete will The application in our country will become more and more extensive, driving the energy conservation and environmental protection of our country’s buildings.
How to use foam concrete admixtures correctly?
1. To improve the workability of foam concrete mortar, admixtures such as: high-efficiency water reducing agent, foam agent, foam stabilizer and foam enhancer are used. Thickener, etc.
2. Admixtures that can be used to adjust the setting time of foam concrete slurry include: retarder, accelerator, early strength agent, etc.
3. Admixtures required to prevent foam concrete from settling and cracking after hardening include: water retaining agent, special glue, etc.
4. Other modified admixtures include: water repellent, water reducing agent, shrinkage reducing agent, etc.
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