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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.


  • 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.

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    The main reasons for joint cracking of foamed lightweight partition boards

    1. Deformation of the main structure

    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.

    2. Unstable material properties

    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.

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    3. The installation quality is too poor

    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.

    4. Improper handling of board seams

    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.

    Preventive measures for joint cracking of foamed lightweight partition boards

    1. Ensure the stability of the main body of the building

    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.

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    2. Ensure stable material performance

    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.

    3. Strictly control construction quality

    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.

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    Supplier

    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).


    Nov 01
    2023
  • 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.

    Types of lightweight concrete partition wall

    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.

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    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.

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    (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).

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    Supplier

    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).


    Oct 31
    2023
  • 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

    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.

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    Types of lightweight aggregate concrete

    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.

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    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.

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    The differences between Lightweight aggregate concrete and foam concrete

    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.

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    Supplier

    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).

    Oct 27
    2023
  • Polycarboxylic superplasticizer is a chemical substance with important application value, widely used in fields such as concrete additives, detergents, cosmetics, and personal health care. This article will give a detailed introduction to the preparation methods, performance characteristics, and applications of polycarboxylate superplasticizers in different fields while analyzing their future development trends and challenges.

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    1Preparation Method of Polycarboxylic Superplasticizer

    The preparation methods of polycarboxylate superplasticizers mainly include free radical polymerization and ion polymerization. Free radical polymerization is the most commonly used preparation method, which generates free radicals through initiators and polymerizes with unsaturated monomers to generate polymer. Ionic polymerization is a polymerization reaction initiated by cationic or anionic initiators to obtain the corresponding polymer.

    In the actual preparation process, it is necessary to strictly control factors such as raw materials, reaction conditions, initiator type, and concentration to ensure that the molecular weight, functional group type and content of polycarboxylate superplasticizer meet the requirements. At the same time, for the requirements of different application fields, specific functional groups can also be introduced in the preparation process to further expand the application range of polycarboxylate superplasticizer.

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    2Performance Characteristics of Polycarboxylic Superplasticizer

    Polycarboxylic superplasticizer has the following important performance characteristics:

    Efficient water-reducing performance: Polycarboxylic superplasticizer can significantly reduce the cement content of concrete, improve its fluidity, and improve the hardening process of concrete, giving it higher strength and durability.

    Molecular design flexibility: By changing the molecular structure and functional group type of polycarboxylate superplasticizer, targeted improvements can be achieved for different performance requirements of concrete. For example, water retaining groups can be introduced to improve the water retention of concrete and avoid problems such as cracking caused by water evaporation.

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    Environmental friendliness: The raw materials of polycarboxylate superplasticizer mainly come from biomass resources, and compared to traditional products containing toxic substances such as melamine water reducing agents, they have better environmental performance. At the same time, polycarboxylic superplasticizer produces fewer harmful substances during production and use and has less impact on the environment and human health.

    Adaptability: Polycarboxylic superplasticizer has strong adaptability to different raw materials such as cement, admixtures, and aggregates and can maintain good usage effects in different seasons and environments. In addition, polycarboxylate superplasticizers can also meet different construction conditions and process requirements.

    3Application of Polycarboxylic Superplasticizer

    Concrete additive: Polycarboxylic superplasticizer is widely used as a concrete additive. In the process of concrete preparation, adding an appropriate amount of polycarboxylate superplasticizer can significantly reduce the cement content of concrete and improve its fluidity, strength, and durability. At the same time, polycarboxylate superplasticizers can also improve the water retention and compactness of concrete during the hardening process, avoiding problems such as cracking caused by water evaporation.

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    Detergent: Polycarboxylic superplasticizer has good surface activity and hard water resistance and can be used to produce low-foam or nonfoam detergents. This detergent can effectively remove various oil and stains while causing less damage to the fabric. After rinsing, the fabric becomes softer and more vibrant.

    Cosmetics and personal health: Polycarboxylic superplasticizers can be used as moisturizers, softeners, and other additives in cosmetics and personal health products. Its excellent moisturizing and moisturizing properties can improve the product's user experience and effectiveness while also having good stability and not having a negative impact on human health.

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    4、 Future Development Trends and Challenges of Polycarboxylic Superplasticzer

    With the sustainable progress of science and technology and the expansion of application fields, polycarboxylate superplasticzers will continue to play an important role in the future. The development trends and challenges are mainly manifested in the following aspects:

    • Research and development of new functional polycarboxylate superplasticizers

    Targeting the needs of different application fields, research and development of new functional polycarboxylate superplasticizers is an important direction for future development. For example, functional groups such as anti shrinkage, anti cracking, and self-healing can be introduced to improve the application performance and effectiveness of polycarboxylate superplasticizers.

    • Production process optimization and cost control

    Although the production process of polycarboxylate superplasticizers is relatively mature, there are still some problems such as high production costs and high energy consumption. Therefore, optimizing production processes, reducing production costs, and improving production efficiency are important directions for future development. Cost control and production efficiency can be improved by introducing new initiators, optimizing reaction conditions, and selecting raw materials.

    • Improving the level of automation and intelligence in the production process

    Adopting automated and intelligent production equipment can improve product quality stability and production efficiency, while reducing manual operation costs and error rates. In the future, advanced technological means such as robot production lines, automated batching systems, and online monitoring systems can be gradually introduced to improve the automation and intelligence level of production process of polycarboxylate superplasticizers.

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    Supplier

    TRUNNANO is a supplier of superplasticizers 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).                                                                                                                                                  

    Oct 16
    2023

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  • Luoyang Tongrun Info Technology Co., Ltd. (cabr-concrete.com) is the world's leading nanomaterial technology developer and application manufacturer, the company has more than 20 years of industry experience, after years of scientific research and production, has been professionals in lightweight concrete and foam concrete solutions. We can supply concrete foaming agents, superplasticizers, aerogels and foam concrete strength enhancers for lightweight concrete mix, CLC blocks all over the world, suitable for ordinary cement foamed concrete cast-in-place, block, plate, insulation wall, etc.
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