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.
A lightweight partition board is a new type of partition material. Its material mainly contains polystyrene particles, cement foam as the sandwich layer, and fiber-reinforced calcium silicate boards as the panels on both sides. These three raw materials themselves are Made of lightweight materials. The lightweight partition panels are also lightweight and easy to carry. There are concave and convex grooves on both sides of the lightweight partition board. When installing, you only need to align the two sides and then apply caulking mortar. The installation is simple and can reduce labor intensity and time costs.
Lightweight partition boards have many advantages. They have high strength and strong impact resistance, can withstand a certain amount of pressure and external impact, and are not easily damaged or deformed. This makes the lightweight partition board walls have good integrity and long service life. Secondly, the lightweight partition board has good fire protection effect. At a high temperature of 1000°C, the fire resistance limit can reach about 3 hours. It is not easy to burn. The non-flammability is A1 level standard and the flame retardant effect is good. At the same time, the lightweight partition board also has a very good thermal insulation effect. Its thermal conductivity is 0.12W/(m·k), which can keep warmth in winter and block heat from entering the room in summer, providing a comfortable indoor environment. In addition, lightweight partition boards are waterproof and moisture-proof and have good impermeability. Even in humid environments, they are not prone to salt brine, mold, etc.
Lightweight partition boards can be used as internal partition materials, such as office partitions, home partitions, warehouse internal partitions, building internal partitions, etc. They can also be used as external partition walls, such as insulated houses, cold storage, steel structure houses, etc. Factory firewalls, laboratory exterior walls and other places.
The commonly used size of lightweight partition boards is 2440*610 mm, with various thicknesses, 75, 90, 100, 120, 150, 200 mm. You can choose according to the architectural design or consult the manufacturer. In addition, lightweight partition boards. It has good plasticity and can be arbitrarily punched, slotted, routed, and wired on the wall. Ceramic tiles, curtains, wallpapers, etc., can also be pasted on the surface.
With the improvement of people's consumption concept, the requirements for living environment are also getting higher and higher. Indoor partition wall demolition and new construction are relatively common types in the field of decoration in recent years. The emergence of modern decoration materials has provided more choices for the installation of indoor partition walls. Lightweight partition boards are one of the common and popular materials.
Lightweight partition board is a new type of building material commonly used in modern partition walls. Its main structure is that the two-sided panels are A1 grade fireproof boards, and the sandwich layer is made of polystyrene particle cement foam mixture. Its installation is simple; it can divide a large space into multiple small spaces to improve space utilization, and it is available in a variety of thicknesses, 75-200 mm.
The installation method of indoor partition panels is divided into several steps:
First of all, we must make preparations before construction, such as ensuring that the wall surface is flat, has no obvious concave and convex, and has a good pasting foundation; calculate materials according to the actual wall and wall panel area to ensure that the purchased lightweight partition panels can cover the entire wall; clean the site and take dust-proof measures to avoid affecting the quality of the project.
(1) Determine the location: Before installation, you need to determine the location and size first and then select the appropriate size and quantity according to actual needs.
(2) Prepare construction tools and materials: Before installing lightweight partition boards, you need to prepare the required construction tools and materials.
(3) Install the keel: At the partition position, install the keel according to the design drawings, mark the position of the keel on the wall, and then fix the keel to the wall with screws.
(4) Install the lightweight partition board: After the keel is installed, place the lightweight partition board on the keel, and then use screws to fix the partition board to the keel, paying attention to the flatness and verticality.
(5) Caulking: Caulking the joints between lightweight partition boards to avoid obvious gaps at the joints after decoration
(6) Painting and decoration: After the installation of the lightweight partition boards is completed, painting and decoration can be carried out according to actual needs to make the partitions more beautiful.
1. The quality of the lightweight partition board itself. The quality of lightweight partition boards is controlled by the manufacturer's raw materials (such as cementitious materials, reinforced materials, and filling materials). Imperfect quality control of any raw materials or lax production process that does not meet national standards will result in It is also expected that the lightweight partition boards will crack, which directly affects the use effect and service life of the lightweight partition boards.
2. Reasons for the construction of lightweight partition boards. If it is not the fault of the lightweight partition board itself, but there are errors or lack of steps during the construction of the lightweight partition board, or the construction workers are not skilled, etc., these construction factors will also indirectly lead to the failure of the lightweight partition board when used. Cracks will occur, which will affect the use effect and service life of the lightweight partition board.
3. External climate factors. Just like us, the dryness and lack of water in summer and autumn will cause dry lips. The same goes for lightweight partition boards. They will also become particularly brittle, which will cause shrinkage and cracking when the lightweight partition boards are used. The situation, which in turn affects the use effect and service life of lightweight partition boards.
1. Cracks in the lightweight partition board itself
(1) If it is a small crack, use a danglin cloth or kraft paper, or bean bag cloth to stick it on the partition.
(2) If the interface between the broken part of the board and the two adjacent boards exceeds 30 cm, you can use a gray knife (or cross) to scratch the crack into a V shape (the upper opening is about 5mm wide and the depth is about 5mm -10 mm) before applying sand dust.
(3) If the interface between two adjacent panels is less than 30 cm, try to replace it with a new lightweight partition board.
2. Cracks caused by lightweight partition board construction
If it is a load-bearing wall or a solid wall, the cause of cracking may be that the putty is too thick during the construction process, or the putty is pasted before it is dry, or the old house becomes a flat wall. For example, if the old wall is cracked when repairing the cracks, it is required to remove all the original base putty and impurities and then re-treat the base layer before construction.
TRUNNANO is a supplier of raw material of lightweight partition board, which is concrete and relative products with over 12 years experience in nano-building energy conservation and nanotechnology development. It accepts 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 concrete additives, please feel free to contact us and send an inquiry. (sales@cabr-concrete.com).
Abstract: Foamed lightweight partition board is a partition board material made from industrial and agricultural solid waste (such as fly ash, coal gangue, rice bran, wheat straw, sawdust, etc.). It has good thermal conductivity and thermal insulation effect. It is outstanding and has a long service life. If installed and maintained properly, it can reach more than 100 years; it can be recycled. When the product life ends, almost all core materials can be pulverized and recycled, so it is very popular in the building materials industry and is widely used. However, during the construction process, joints may crack when assembling lightweight foam partition panels, which affects the construction quality.
During the construction of foam lightweight partition boards, it is inevitable to interface with the main structure. If the main structure has uneven foundation settlement, it will cause problems such as distortion and cracking of the main beams, boards, and walls. At the same time, high-rise residential buildings are affected by wind force. The impact will cause lateral swings and twisting of the walls in the building, which can induce later cracking of the foamed lightweight partition boards.
Foam lightweight partition board
As a cement-based material, boards inevitably have the characteristics of water absorption, thermal expansion, and shrinkage. Before entering the site for installation, the water has basically evaporated during the processing, and the water absorption and swelling rates have just stabilized. The later construction of wall grouting and wall gypsum putty painting construction is affected by moisture again; shrinkage will inevitably occur during the air-drying process. Its innate characteristics also determine that it is easily affected by changes in external humidity and temperature.
Because the foamed lightweight partition panels are directly fixed on the wall keel, the material quality and construction quality of the keel will also have a direct impact on the panel; this also requires on-site construction management personnel to do an excellent job of the incoming materials and construction process. Reasonable quality control to reduce subsequent quality problems caused by differences in construction levels. Since the fiber cement board of the foamed lightweight partition board is fixed on the keel with high-strength self-tapping screws, the number of set self-tapping screws is relatively large. Inevitably, there will be inconsistent fixing strengths, leading to inconsistent tightness at the joints of the boards fixed on the same vertical keel, resulting in cracks in the wall.
The material quality and construction level used to deal with the board joints will also have a direct impact on the board joints. High-strength gypsum or high-strength putty must be used for caulking to offset the tie coefficient between boards to ensure the tightness of the gaps. Properties: paste anti-crack bandages outside the gaps, and do not use plaster. The quality of the anti-crack bandages outside the board joints is one of the influencing factors.
Before preparing for the construction of the secondary structure, the foundation settlement of the main structure should be observed from time to time. Only organize the installation of the foamed concrete wall once the main structure is completed or the settlement of the main structure is stable to avoid uneven settlement of the main structure. At the same time as the cracks in the wall are removed, the lightweight foam partition panels should be synchronized with the construction of the doors, windows and walls of the building to form the integrity of the building and reduce the impact of external forces such as wind.
Fiber cement boards have material characteristics that expand when wet and shrink when dry. The boards used in the installation of foamed lightweight partition boards must use high-quality materials. The material must have a test report from the relevant local quality inspection department and a material entry retest report to reduce the impact of wall joint shrinkage changes caused by the board itself. At the same time, during the transportation and storage of the panels, attention should be paid to the impact of the storage environment, and they should not be exposed to the open air to avoid factors such as wind, sun, rain, etc. that may affect the swelling changes of the panels in the future. Conditional construction sites can allow the panels to be processed. A constant-temperature storage room is provided behind the site specifically for storing fiber cement boards; remember not to expose the boards in an open area.
During the installation process, construction quality must be strictly controlled. A comprehensive, reasonable, and operable construction plan and technical explanation must be developed before construction to provide sufficient technical support for on-site construction. A particular plan must be developed in advance for common quality problems that are prone to occur. Conduct in-depth technical briefings with the management personnel and construction personnel involved in the construction at the site to ensure the construction level of each participant and avoid blind construction.
TRUNNANO is a supplier of CLC concrete with over 12 years experience in nano-building energy conservation and nanotechnology development. It accepts 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 concrete additives, please feel free to contact us and send an inquiry. (sales@cabr-concrete.com).
Lightweight concrete partition board is a new type of building energy-saving product, which is made of lightweight concrete and steel bars as the main materials, processed and cured. This type of partition board usually has a thickness of less than or equal to 200mm and a weight of less than or equal to 30kg/㎡. It has advantages such as lightweight, high-strength, good insulation and sound insulation, long-lasting fire resistance, and low cost. Lightweight concrete partition panels are mainly used for the internal and external walls of high-rise frame buildings and industrial factories, which can effectively improve the insulation and sound insulation performance of buildings, while also reducing the self weight of buildings and saving energy. During the construction process of lightweight concrete partition panels, attention should be paid to their installation accuracy and fixation to ensure that their quality and safety performance achieve the best results.
The types of partition walls can be roughly divided into three categories: lightweight aggregate concrete, lightweight porous (closed cell) concrete, and lightweight aggregate porous concrete. Among them, the commonly used partition wall material for lightweight aggregate concrete is ceramsite concrete, but when preparing ceramsite concrete with lower density, it is easy to cause the phenomenon of ceramsite floating due to the large density difference between the slurry and the ceramsite. For this reason, when using ceramsite concrete to prepare partition boards, it is generally adopted to use pre-wet ceramsite and introduce an appropriate amount of gas into the slurry to reduce the density difference between the slurry and the ceramsite to form lightweight aggregate porous concrete. - Ceramsite foam concrete to improve the phenomenon of ceramsite floating.
Quality requirements for lightweight concrete partition panels
The main function of the partition wall panel is to separate the space. From the aesthetics perspective, the partition wall panel should have no cracking and good surface smoothness. From the perspective of use requirements, it needs to meet certain strength, sound insulation and heat insulation requirements.
The quality of building partition wall panels can be controlled from four aspects: appearance quality, dimensional deviation, drying shrinkage and strength:
(1) Appearance quality. Refers to whether there are exposed ribs, honeycombs or through cracks on the board surface. The phenomenon of exposed ribs in partition wall panels is generally caused by improper placement of reinforcement mesh or irregular concrete vibration. The appearance of honeycombs in partition wall panels is closely related to the quality (working performance) of concrete. The poor fluidity of concrete can easily lead to the phenomenon of honeycomb pitting. In each panel, the existence of honeycombs cannot be greater than 3 places. The penetration cracks of partition wall panels are mainly caused by the drying shrinkage of the concrete itself or the demoulding of the partition wall panels after forming and human factors during the transportation process. For the through cracks in the partition wall caused by human factors, it is necessary to ensure the maintenance time or improve the maintenance method to ensure the strength of the concrete before demoulding and standardize the transportation operation process to avoid the occurrence of cracks.
(2) Dimensional deviation. The dimensional deviation mainly includes the length, width, thickness, diagonal difference, lateral bending and flatness of the partition board. The deviation is mainly caused by the forming mold. Generally, the size of the partition board can be improved by ensuring the dimensional accuracy of the mold used. Deviations are guaranteed. The excellent flatness of the board surface is the premise of realizing the thin plastering or plastering-free process of the wall. According to JG/T169-2016, the flatness deviation of the partition board should be ≤2mm. For the walls built with aerated concrete blocks, such as large real estate development companies such as Vanke, the flatness deviation of the masonry walls is controlled within 4mm. It can be seen that the partition board has a great advantage in the flatness of the wall.
(3) Drying shrinkage. The drying shrinkage of concrete is an important cause of wall cracks. For concrete partition panels, the drying shrinkage should be less than or equal to 0.50mm/m.
(4) Strength. It mainly includes the compressive strength, impact resistance, flexural failure load and suspension force of panel partition walls. Although the partition wall is a non-load-bearing component, in order to ensure the daily use of hanging items on the wall, the compressive strength of the panel partition walls is ≥5 MPa, and the hanging force is ≥1000N. The impact resistance and bending resistance of the partition wall are the prerequisites to ensure that the panel partition walls will not have quality problems, such as through cracks during transportation and installation. When the thickness is less than or equal to 150mm).
TRUNNANO is a supplier of CLC concrete with over 12 years experience in nano-building energy conservation and nanotechnology development. It accepts 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 concrete additives, please feel free to contact us and send an inquiry. (sales@cabr-concrete.com).
Although both foam concrete and lightweight aggregate concrete are lightweight, they are very different in manufacturing technology, material composition and performance. This article will briefly introduce the two kinds of concrete.
Lightweight aggregate concrete refers to concrete that uses lightweight aggregates with an apparent density not exceeding 1950kg/m3. The so-called lightweight aggregate is an aggregate used to reduce the quality of concrete and improve thermal performance, with a lower apparent density than ordinary aggregate. Artificial lightweight aggregate is also known as ceramsite.
Characteristic:Lightweight aggregate concrete has the characteristics of lightweight, high-strength, thermal insulation, fire resistance, and seismic resistance, and has good deformation performance, low elastic modulus, and generally has significant shrinkage and creep.
Applying: Lightweight aggregate concrete is applied in industrial and civil buildings and other engineering projects, which can reduce structural self-weight, save material consumption, improve component transportation and lifting efficiency, reduce foundation load, and improve building functions. It is suitable for high-rise and large-span buildings.
1. According to usage
Lightweight aggregate concrete can be divided into thermal insulation lightweight aggregate concrete, structural thermal insulation lightweight aggregate concrete, and structural lightweight aggregate concrete according to their different uses in construction engineering. In addition, lightweight aggregate concrete can also be used as heat-resistant concrete to replace kiln lining. A block of concrete with a dry apparent density not exceeding 1950kg/m3 is prepared by using natural porous lightweight aggregate or artificial ceramic particles as coarse aggregate, natural sand or lightweight sand as fine aggregate, and Portland cement, water, and admixtures (or without admixtures) according to the mix requirements.
2. According to aggregate
Lightweight aggregate concrete is divided into entirely lightweight concrete and sand lightweight concrete according to the different types of fine aggregates. The use of light sand as fine aggregate is called fully lightweight concrete; Sand lightweight concrete is made of ordinary sand or some light sand as fine aggregate.
Foam concrete, also known as lightweight porous concrete (LCC), low-density porous concrete (LDCC), and other terms, is defined as cement-based grout, and the foam entrained in plastic mortar is at least 20% (per volume). Since coarse aggregate is not used to produce foam concrete in most cases, the correct term should be called mortar rather than concrete; It can also be called foam cement. The density of foam concrete usually varies from 400 kg/m3 to 1600 kg/m3. Density is usually controlled by replacing all or part of the fine aggregate with foam.
Foam concrete is usually composed of cement slurry or fly ash, sand and water. However, some suppliers recommend mixing water and pure cement with foaming agent to obtain a very light mixture. Furthermore, the slurry is mixed with synthetic aerated foam in the concrete mixing plant. Foam is made by mixing foaming agent with water and air from the generator. The foaming agent must be able to generate highly stable bubbles and resist the physical and chemical processes of mixing, placement, and hardening.
The foam concrete mixture can be poured or pumped into the mold or directly injected into the structural elements. Due to the thixotropic behavior of foam bubbles, foam enables the slurry to flow freely, thus making it easy to pour into the selected form or mold. Adhesive materials can take up to 24 hours to cure (if the steam curing temperature reaches 70 ° C to accelerate the process, it only takes two hours), depending on variables such as ambient temperature and humidity. Once solidified, the formed product can be demolded from the mold. A new application in the manufacture of foam concrete is to use special steel wires to cut large concrete blocks into blocks of different sizes through a cutting machine. The cutting action occurs before the concrete has fully solidified.
From the above description, it can be seen that there are obvious differences between foam concrete and lightweight aggregate concrete in manufacturing process, composition and characteristics.
Manufacturing process: Foam concrete is made by adding foaming agent in water to form a large number of bubbles in water and then loading the foamed cement slurry into the mold for static curing. Lightweight aggregate concrete is formed by mixing cement, sand, and water evenly, adding lightweight aggregate and Foamcrete accelerators to form bubbles, and then solidifying in a mold.
Main ingredients: The main ingredients of foam concrete are cement, sand, water and foaming agents. The main components of lightweight aggregate concrete are cement, sand, lightweight aggregate, and Foamcrete accelerators.
Characteristics: Foam concrete has certain advantages, such as good thermal insulation performance, convenient construction, etc., but also has disadvantages, such as low strength, stability problems, etc. Lightweight aggregate concrete has the characteristics of lightweight, high-strength, thermal insulation, and fire resistance and has good deformation performance and low elastic modulus.
TRUNNANO is a supplier of CLC concrete with over 12 years experience in nano-building energy conservation and nanotechnology development. It accepts 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 concrete additives, please feel free to contact us and send an inquiry. (sales@cabr-concrete.com).
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