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.
The pouring method of foam concrete wall can be divided into three types: detachable mold pouring, non-detaching mold pouring, and sandwich wall pouring. Among the three types of pouring methods, the non-detaching mold pouring method is widely used.
The cast-in-place wall without dismantling form is born for the construction of foam concrete wall in recent years. As foam concrete is especially suitable for cast-in-place construction (such as roof insulation, ground heating insulation, floor cushion, filling engineering, etc.), people have been studying how to apply it to wall pouring in order to give full play to its good physical properties. however, due to the high fluidity of foam concrete, it is easy to cause accidents such as mold expansion and slurry leakage for the high pouring height of the wall. At the same time, it is difficult to grasp the uniformity and stability in the pouring process of closed construction.
Therefore, the foam concrete non-dismantling mold wall pouring, to solve the expansion mold, slurry leakage technology is the key factor. According to the use, the foam concrete pouring of non-dismantled formwork wall can be divided into the preparation technology of pure ordinary Portland cement foam concrete and the preparation technology of foam concrete with lightweight aggregate.
Preparation technology of ordinary Portland cement foam concrete. Ordinary Portland cement wall pouring foam concrete is the most common wall pouring foam concrete, the wall core generally has low eyeball strength, but good sound insulation, thermal insulation and fireproof performance. No matter what kind of hollow wall this product is poured, it has few requirements for the settlement and bleeding of foam concrete. One of these two indexes is to select a good foaming agent, which should have good foam stabilization and pressure resistance. At the same time, it should have affinity with a variety of cement, allow to add some admixtures, and recommend animal protein foaming agent and compound foaming agent, which are the first choice for wall pouring.
Preparation technology of foam concrete with lightweight aggregate. For the medium-height wall casting materials with higher requirements, it is necessary to add low-density lightweight aggregates to foam concrete, especially some lightweight aggregates, such as fly ash, ceramsite, polyphenylene particles, perlite, vitrified beads and so on.
The technology of foam concrete transportation is the key to the success of wall pouring. As an ordinary pumping foaming equipment, its unreasonable transportation mode will cause the instability of foam concrete and the difficulty of operation and control. in a large number of wall pouring failure cases of foam concrete pouring failure, most of the failures are caused by poor transportation technology.
Foam concrete contains a large number of air bubbles and has a certain degree of compressibility, which will cause separation and fragmentation in different flow velocity and pressure environment. Unreasonable transportation will cause changes in the quality of foamed concrete, and these changes will lead to pouring failure to a certain extent. Through a large number of experiments, it is found that the transportation of foam concrete should be unidirectional, low pulse and uniform flow. Among several kinds of pumps such as hydraulic plunger pump, diaphragm pump, screw pump and hose pump, only the latter two are close to the requirements of foam concrete transportation.
The biggest advantage of these two kinds of pumps is that there is no inlet and outlet valve, one-way pulse output, no negative pulse caused by round-trip movement, to maximize the protection of the original state of the product. Therefore, the best choice for the transportation of foam concrete is the hose pump, because the pressure of the pump can reach 2.5MPa, which is twice as high as the screw pump, and is the preferred equipment within the range of the maximum effective height specified in the current foam concrete industry standard.
Concrete Additives Supplier
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.
Lightweight foamed concrete, also known as foamed cement, is a lightweight porous concrete product made from foaming agent aqueous solution into foam, and then adding foam to the slurry made of cement-based cementitious materials, aggregates, admixtures, admixtures and water, etc., through mixing, pouring and natural curing.
1. With compressive strength and aging resistance: although the traditional chemical thermal insulation materials can achieve the effect of thermal insulation, their compressive strength and anti-aging properties have been unable to meet the requirements. Lightweight foamed cement can completely solve this problem. It is a substitute for traditional thermal insulation materials.
2. It has a good light weight: effectively reducing the load of the building.
3. Good sound insulation: the sound insulation of lightweight foamed cement is 5-8 times that of ordinary cement, which fully solves the problem of sound insulation in living space.
4. Good high temperature resistance: the suitable temperature of foamed cement can reach more than 250 ℃ and 300 ℃, while the benzene board will soften and chemical reaction will occur when the temperature is above 75 ℃.
5. Improve the stability and life of the insulation layer: the foamed cement insulation layer has a high stability and anti-aging performance, which effectively ensures that the indoor floor is flat and uncracked, and its service life is 5-10 times that of benzene board and 5 times that of perlite particles.
6. Good environmental performance: all additives of foamed cement are plant protein fiber and animal protein, which are non-toxic and harmless, while chemical thermal insulation materials such as benzene board and perlite particles can produce harmful and toxic gases at high temperature.
7. Good thermal insulation: the thermal conductivity is 0.08w/m.k, which is 20-30 times that of ordinary cement.
8. It has a good compressive strength: when the density is 350kg/m3, the 7-day compressive strength is 6 kg, and the 28-day compressive strength is 9kg/cm2.
9. The construction is simple: foamed cement is a mobile liquid transported by mechanical high pressure, the construction saves manpower and material resources, and the surface is smooth and smooth after solidification.
10. Good moistureproof: when heating, there will be no condensation around the warm water pipe, and there will be no split between the layers.
11. Good combination: the material of foamed cement is cement, and the combination of the upper and lower layers is very good, so that the ground will not form hollow and collapse.
12. The construction speed is fast.
13. Good integrity: a cast-in-place seamless and intermittent, and cast-in-place board and mortar layer can be completely combined to form a whole.
14. It has the function of impermeability: due to the porosity and integrity of foamed cement, the impermeability of foamed cement is more than 6 times higher than that of ordinary floor.
15. Fireproof: foamed cement is an inorganic material (cement), which will not burn, so it has good fire resistance. When used in buildings, it can improve the fire resistance of buildings.
Concrete Additives Supplier
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.
Cement is the main raw material of foam concrete. Because foamed concrete is mostly cured at room temperature and mixed with a large amount of foam, these two points determine its high cement proportion.
This is the fundamental difference between it and aerated concrete. Due to the use of autoclave, aerated concrete mainly depends on the hydration reaction of fly ash and lime under high heat and high pressure to produce gelling, and cement is auxiliary.
When foam concrete is produced at room temperature, active micro-aggregate will not produce hydration reaction quickly, and its foam still depends on the cementation of cement. Therefore, the mix proportion of foam concrete should be cement as the main body and high cement proportion should be adopted.
In general, the amount of cement should account for 50% of the total dry material. 50% should be the minimum limit for curing at room temperature. When pouring on site, the proportion of cement should account for more than 80% of the total dry material. The density of foamed concrete at room temperature is less than 600kg/m3, and the proportion of cement can not be less than 70% of the total material. When the density is less than 400kg/m3, the proportion at room temperature should account for more than 90% of the total dry material.
In the design of cement proportion, the following factors should be considered:
1. The variety of cement. The cement varieties with high early and late strength (such as double fast Portland cement) can appropriately reduce the proportion, while the cement varieties with low late strength or low early strength should increase the cement proportion.
2. The strength grade of cement. The proportion of high strength grade cement can be reduced, while that of low strength grade cement should be increased.
3. The quality of cement. The proportion of the cement of the new dry rotary kiln in the large factory can be reduced appropriately, while the cement in the shaft kiln of the small factory or the cement with a large amount of admixture should be properly increased.
4. The density and strength requirements of foam concrete. The proportion of cement with low density or high strength requirement should be increased, while that with high density or low strength requirement can be reduced.
Concrete Additives Supplier
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 also known as clc foam concrete. It is a lightweight thermal insulation material made of cement, lime and fly ash as main materials and mixed ingredients such as foaming agent. It has the characteristics of small bulk density and good thermal insulation performance, and can be widely used in roof insulation, underground engineering backfilling, indoor cushion and so on.
Foam concrete is a new type of environment-friendly building material, which is a porous lightweight plate composed of a variety of inorganic cementitious materials and organic fibers, and a cast-in-place wall material and decorative products formed by on-site pouring or mold molding. it can also be used as an inner partition wall in the renovation of non-load-bearing filling walls and building inner and outer walls or new projects.
Why is foam concrete a green product?
1. The source of raw materials is mainly industrial waste (such as fly ash, slag, etc.).
2. There is no harmful gas emission in the production process.
3. The production process is reasonable.
Why can foam concrete floor play the role of sound insulation and noise reduction?
1. The energy loss of sound wave in the process of propagation is weakened due to the porous characteristics of bubble structure.
2. The closed bubble makes it have a good effect on sound absorption.
3. Reduce the ways of noise transmission.
4. Improve the reflection effect of sound.
Concrete Additives Supplier
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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