Foam concrete is a kind of concrete with lightweight and has ideal strength. Because of the hollow structure in foam concrete, it has the function of absorbing heat and isolating sound.
The density of foamed concrete is 300-1200 kg/m3, and the thermal conductivity is between 0.08-0.3W/ (m ·K).
Foam concrete is widely used in CLC blocks, lightweight partition panels, roof insulation, floor cushion construction, floor heating backfilling, and other occasions.
At the same time, foam concrete is also a good sound absorption material, which can be used in highway sound insulation boards, sound absorption boards, and other fields.
Generally speaking, foam concrete is a kind of building material with multi-function, environmental protection, and economy, which has a wide application prospect.
To study the problem of collapse mode cracking in the cast-in-place foam concrete wall, using ordinary Portland cement, fly ash, and self-made composite foaming agent as the primary raw materials, the admixtures (there are two kinds of admixtures) were studied through single-factor experiments. One is a foaming agent, and the other is concrete curing agent.
According to the characteristics of the foaming agent that the foam pore size can be adjusted freely, and the preparation is atomized and diluted during use. The pore size is more acceptable and uniform (the pore size is less than 1mm). The light foam and slurry are mixed to make a lightweight concrete microporous slurry. The porosity in the slurry accounts for 70% of the total volume of the foamed concrete. The foams in the slurry are closed by a water film. They are not connected, which improves the problem of high water absorption in traditional concrete and improves the frost resistance and impermeability of foam concrete. It has a specific activation effect on fly ash.
The slurry in the pouring and forming stage has self-leveling characteristics, good pore structure, smooth entry into the mold, and rapid thickening and forming. Ensure the stability of expansion and improve the strength of foam concrete blocks. Foamed concrete has excellent properties such as lightweight, heat preservation, heat insulation, sound insulation, etc., and it has low production investment. It can use a large amount of industrial waste residue. Its application is of great significance to building energy conservation and environmental protection, so it will gradually replace concrete construction.
According to previous studies, with the increase of fly ash content, the amount of cement decreases, and the early compressive strength of concrete drops significantly. However, fly ash has pozzolanic activity, and in an alkaline environment, with the increase of concrete age, the compressive strength of high-volume fly ash foam concrete will increase significantly. In addition, the large amount of fly ash dramatically reduces the number of harmful pores, improves the compactness of the slurry structure, and is beneficial to the later strength increase.
In recent years, the application of foamed concrete has developed rapidly, but there are still a series of problems in the cast-in-place foamed concrete insulation wall:
(1) Foam concrete has low strength and is not suitable as a load-bearing wall material;
(2) Prefabricated blocks increase the process and engineering costs;
(3) Dry shrinkage of foam concrete and cracking caused by dry-wet cycle and loose structure, due to the problems of collapsed form and easy carbonization due to the influence of pouring height, seriously restrict the broad application of foam concrete.
TRUNNANO is a concrete additives supplier with over 12 years experience in nano-building energy conservation and nanotechnology development. We accept payment via Credit Card, T/T, West Union and Paypal. Trunnano will ship the goods to customers overseas through FedEx, DHL, by air, or by sea.
If you are looking for high quality foaming agent, please feel free to contact us and send an inquiry.
sales@cabr-concrete.com
What is Foam Cement?
Foam cement is a new type of lightweight thermal insulation material containing a large number of closed pores. It is to use mechanical method first concrete foaming agent full foaming, then foam and cement mud even mixing, cast-in-situ construction, or through the pumping system of foaming machine molding and become. Finally, after natural conservation, formed.
It belongs to a bubble insulation material. Its outstanding feature is the closed foam hole inside the concrete can make the concrete lightweight, heat preservation, and heat insulation.
19. Sound insulation sandwich composite plate (partition plate)
The existing indoor partition is installed on both sides of the wooden keel 5~10 mm of paper plasterboard, the wall is empty, no sound insulation, also not strong, cannot nail. Foam concrete composite sound insulation board 5 CMS thick, small space, two surfaces for the color decorative surface layer, the middle is 4 CMS thick foam concrete, partition effect, and sound insulation effect, installation twice as fast, popular with consumers.
20. Application of energy absorption function
21. Application of energy absorption in airport protection
Foam concrete has strong impact resistance. Ordinary concrete can be broken with a sledgehammer, but it is difficult to break foamed concrete. Using its energy absorption, a number of high value-added products have been developed and applied abroad, such as airport safety foam block, racing safety foam block, road accident prone area safety foam block. When the aircraft, automobile due to out of control out of the runway or road, into the foam block protection belt, because of the foam block impact absorption performance, so that it stops and protect the aircraft or vehicle nondestructive.
22. Military applications of fire and explosion energy absorption protection
Foamed concrete has a good absorption effect on bullet impact and explosion shock wave, which can greatly reduce the destructive power of shooting and explosion. In terms of explosion resistance, there are two kinds of products with development significance: military and civil:
Military: foamed concrete can be used for all kinds of underground or aboveground military engineering, ammunition depot, etc. Adding tens of centimeters of foamed concrete (cast-in-place or masonry) to its engineered walls and top can reduce explosive damage. In addition, the assembled foamed concrete seismic command post and the buildings for battlefield hospitals have great development value.
Civil use: anti-explosion foam concrete is mainly used in explosive storehouse, explosive chemical raw material storehouse, explosive equipment workshop, when it happens to accident, can reduce the explosive destructive power, reduce the loss.
23. Application of anti-electromagnetic radiation
Foamed concrete is an excellent electromagnetic shielding material, which can absorb and eliminate electromagnetic waves.
24. Water permeable and breathable application
Permeable floor tile;
Breathable planting grassland surface;
Permeable bricks are also permeable bricks. Water permeable and breathable can make plants grow under the foamed concrete ground, and grow to the ground through the pores, forming green vegetation. Taking advantage of this, the United States has developed the cast-in-place cover of foamed concrete dump, the cast-in-place cover of slope protection of highway, railway and dam and bank, and the sand control cover of sandy land. After casting with foamed concrete, the grass can still grow, which solves the contradiction between covering concrete and green grass.
25. Filter app market
River sand water filtration: such as water quenching slag, industrial residue, etc., can use this filter plate.
Industrial machinery filter layer: foam concrete filter into the filter element, low cost, good water filtration effect, desirable high cost and difficult to make foam ceramic filter element.
26. Application of fire prevention function
Fire doors;
Fire prevention board: foamed fire prevention board, fire prevention is stronger, foamed density reduced to 800㎏/m3, lightweight outstanding, has a great market advantage.
27. Application of anti-seepage and waterproof function
Closed cell foamed concrete has hydrophobicity, drop water is lotus leaf dew effect, so its impermeable waterproof excellent. This foam concrete has two main application markets:
Building waterproof and engineering waterproof: in all parts of the building need waterproof such as roofing, basement, toilet pouring or masonry foam concrete, can leave out waterproof agent, and achieve permanent waterproof, to overcome the shortcomings of waterproof coating easy to fall off failure. Use it instead of waterproof material, low cost, long life, more competitive. In water conservancy projects such as canals, pools, water towers, swimming pools, underground military projects, tunnels, embankments, fish ponds, artificial lakes and other waterproof and impermeable aspects, can use foam concrete masonry or pouring, eliminating all waterproof materials, it is both structural materials, but also waterproof materials have great advantages.
Application of chloride ion erosion resistance in underground and underwater engineering: in soil or water with large chloride ion content, the base, foundation pile and bridge pier of concrete engineering may suffer from chloride ion erosion. If a protective layer of foamed concrete is laid or poured on the outside of these engineered structures, the chloride ions will not be carried by water into the concrete because the foamed concrete is impervious to water.
Suppliers of Concrete Additives
TRUNNANO is a reliable foaming agents supplier with over 12-year experience in nano-building energy conservation and nanotechnology development.
If you are looking for high-quality CLC foaming agents, please feel free to contact us and send an inquiry. (sales@cabr-concrete.com)
We accept payment via Credit Card, T/T, West Union, and Paypal. TRUNNANO will ship the goods to customers overseas through FedEx, DHL, by air, or by sea.
Foam concrete is prone to cracking during maintenance, mainly caused by unscientific construction and maintenance of the proportioning. Luchuang has a series of solutions. In the years of construction, Luchuang has accurate material proportions for different climatic conditions and different terrains. The construction quality is industry-leading.
Aggregates rarely change during concrete hardening and use unless there is a significant volume change due to heat and cold. Chemical shrinkage, carbonization shrinkage, drying shrinkage, etc., all come from cement slurry. Foam concrete is mainly composed of cement and does not contain aggregates, determining its considerable shrinkage.
The strength development of foamed concrete is relatively slow in the initial curing stage, and its low thermal conductivity makes it difficult for the heat generated by hydration to be discharged to the outside in time, which often leads to a sharp increase in the initial temperature of foamed concrete, resulting in volume expansion. Internal thermal stress and cracks are generated.
The strength of foamed concrete is at a low level (generally not higher than 10MPa) even after it is completely hardened, so any abnormal external mechanical force will also cause its deformation or even cracking and failure. Possible technical approaches to reduce shrinkage and control cracking of foamed concrete.
Based on the above-mentioned analysis of the volume deformation phenomenon and internal causes of concrete in the process of hydration and hardening and use, and the study of the similarities and differences between foam concrete and ordinary structural concrete in terms of composition, structure, and performance, combined with foam concrete preparation and application may appear In this paper, the following possible technical approaches are proposed on how to reduce the shrinkage and control cracking of foamed concrete.
1) Use fast-hardening and low-heating cement as the cementitious material for foam concrete;
2) Add an appropriate amount of fine aggregate, and choose a reasonable mix of cement and sand;
3) Strengthen early maintenance and timely heat dissipation to reduce artificial abnormal external mechanical impact;
4) Introduce appropriate and appropriate expansion components to make up for volume shrinkage; reduce space constraints and increase free deformation components.
TRUNNANO is a concrete additives supplier with over 12 years experience in nano-building energy conservation and nanotechnology development. We accept payment via Credit Card, T/T, West Union and Paypal. Trunnano will ship the goods to customers overseas through FedEx, DHL, by air, or by sea.
If you are looking for high quality foaming agent, please feel free to contact us and send an inquiry.
sales@cabr-concrete.com
What is Foam Cement?
Foam cement is a new type of lightweight thermal insulation material containing a large number of closed pores. It is to use mechanical method first concrete foaming agent full foaming, then foam and cement mud even mixing, cast-in-situ construction, or through the pumping system of foaming machine molding and become. Finally, after natural conservation, formed.
It belongs to a bubble insulation material. Its outstanding feature is the closed foam hole inside the concrete can make the concrete lightweight, heat preservation, and heat insulation.
9. For wall pouring on site.
Foam concrete is used as a non-load bearing wall of buildings by foaming and pouring on-site, which changes the common method of the precast block building wall. The wall integrity is good, the construction is simple, the labor intensity is small, and the cost is low. At the same time, it has the advantages of being lightweight, heat insulation, waterproof and seepage prevention, etc. It is an alternative product to the traditional wall.
10. Foam concrete can also be used for firewall insulation filling, sound insulation floor-filling, tunnel lining backfilling; As well as the isolation of power supply and water pipelines.
11. Thermal insulation application
Foam concrete contains a large number of closed air holes, the air inside the pores is a good insulation medium and can cut off the heat exchange. The lower its density, the more pores, and the better insulation. In particular, the density of foam concrete is lower than 500㎏/m, and its thermal conductivity is less than 0.09W/M.K. Usually, the thermal conductivity of the material is less than 0.23 called thermal insulation material, the thermal insulation material is less than 0.14 called thermal insulation material. The thermal conductivity of foam concrete is mostly lower than 0.09, so it is a good thermal insulation material.
12. Thermal insulation application
Building thermal insulation is the main application field of foam concrete, accounting for 80% of the total output of foamed concrete for building thermal insulation. Its good thermal insulation performance and building energy-saving policy pull, promote it in the field of building thermal insulation began to large-scale application. The focus of development and application has begun to shift to the wall, the next round of application upsurge will be mainly self-insulation wall. All kinds of foam blocks, foam wallboard, foam cast-in-place wall, and various composite structure exterior wall insulation board have been launched in various places, and their large-scale production and application have begun.
If all building insulation use foam concrete, including roofing insulation thermal insulation layer, wall insulation, thermal insulation layer of floor heating (or bed), equal with foam concrete to wrap the whole room, and a square meters building area is about 0.2 m to 0.5 m foam concrete (roof, floor, the walls are calculated by 5 cm thermal insulation layer). A building with a building area of 10000 square meters needs foam concrete of 2000m-5000 m.
13. Insulation of piping and thermal equipment
The main products of thermal pipe insulation are prefabricated pipe insulation shells and special-shaped materials, as well as thermal insulation panels.
14. Cold storage insulation
Cold storage insulation is now using foam plastic. Because foam plastics are easy to age and flammable, developed countries are changed to foam concrete pouring or masonry insulation layers. Its main use of overall cast-in-place, roof, wall, ground all-foam concrete cast-in-place, no cold bridge, no gap.
15. Industrial furnace insulation
Its main product is refractory heat preservation brick. In order to reduce energy consumption, large industrial furnaces such as iron and steel factories, glass factories, ceramic factories, non-ferrous metal smelters, and cement calcining kilns need to build a layer of thermal insulation refractory bricks on the outside of refractory bricks. Use bleach bead brick, and alumina foam brick more originally, the price is extremely high. Some countries are starting to replace expensive traditional products with foam concrete firebricks, which cost less than half as much and are very competitive.
16. Sound absorption and sound insulation applications
Open-cell foam concrete is an excellent sound-absorbing material, while closed-cell foamed concrete is an excellent sound insulation material. Both of them have a great market, especially sound-absorbing material, with a better prospect.
Usually, the material with an average sound absorption coefficient greater than 0.2 is called sound absorption material. Its traditional products have two categories: fiber (rock mineral wool board, etc.) and porous (foam plastic and foam glass, etc.). Foam concrete is a new type of porous sound-absorbing material, its average sound absorption coefficient is 0.8~1.4, is a strong sound-absorbing material, and can reach the first or second level standard. Its application in the following aspects has great market and competitive advantages.
17. Outdoor sound absorption materials (road and railway sound absorption barriers)
Foam concrete outdoor sound-absorbing material market is mainly highway and railway on both sides of the sound-absorbing barrier. Nowadays, the main sound absorption barriers used in road are wood scraps cement boards, and foam glass boards. The former absorption coefficient is very low, cannot meet the needs of high-speed railway, and is not beautiful, the latter price is too high. And foamed concrete sound absorption performance is good, can meet any road sound absorption requirements, and the price is very low.
18. Indoor wall sound absorption
Indoor sound absorption ceiling and sound absorption wall. Foam concrete has a great market advantage in-wall sound absorption. Compared with rock mineral wool and other fiber sound absorption board, it does not have the disadvantage of making the whole body itch when cutting and installing, and the strength is good, and the price is low. In the subway wall, it will have a great market, in large shopping malls, station waiting rooms, cinema, conference halls, and other building wall has a great market.
Suppliers of Concrete Additives
TRUNNANO is a reliable foaming agents supplier with over 12-year experience in nano-building energy conservation and nanotechnology development.
If you are looking for high-quality CLC foaming agents, please feel free to contact us and send an inquiry. (sales@cabr-concrete.com)
We accept payment via Credit Card, T/T, West Union, and Paypal. TRUNNANO will ship the goods to customers overseas through FedEx, DHL, by air, or by sea.
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