Introduction to cellular concrete
Porous concrete (cellular concrete) generally refers to sand-free macrocellular concrete. No sand macrocellular concrete is concrete that does not contain fine aggregate (sand). It is made of cement, coarse aggregate and water mixed proportionately. Since fine aggregate (sand) is not used, there are a large number of larger holes in it. The size of the holes is generally roughly the same as the particle size of the coarse aggregate. Due to the existence of these holes, numbers of physical and mechanical properties of the material are different from ordinary ones. Concrete varies greatly. The raw materials of sand-free macrocellular concrete include cement, coarse aggregate and mixing water. Early strength agents and water reducing agents can also be used according to the project’s needs.
The coarse aggregate used in sand-free macrocellular concrete can be gravel, pebbles, or artificial light aggregate. Old sand-free macrocellular concrete can also be used as coarse aggregate after crushing. Using different coarse aggregates, the physical and mechanical properties of the materials are also different.
Sand-free macrocellular concrete is a porous accumulation structure cemented by coarse aggregate and cement stone. Since the strength of coarse aggregate is much higher than that of concrete, the bonding strength between coarse aggregate and cement stone is the weakest link of the material. The damage mainly occurs in the cement stone layer between the aggregate interface, so the cementitious material’s type, strength and quantity of cement play a key role in the strength of sand-free macrocellular concrete. Generally speaking, ordinary Portland cement should be used for sand-free macrocellular concrete, or slag Portland cement can also be used. Other types of cement should be determined through experiments. To ensure that sand-free macrocellular concrete has satisfactory strength, cement grades of 42.5MPa and 52.5MPa are mostly used.
The coarse aggregates used in sand-free macrocellular concrete can be divided into two categories: ordinary coarse aggregates and lightweight aggregates (including artificial and natural aggregates). Tests have shown that the smaller the particle size of sand-free macrocellular concrete aggregates, the greater the porosity between Jike particles and the strength of the prepared concrete is higher. Therefore, sand-free macrocellular concrete aggregates usually use a single particle size with a small size. , such as 10~20mm or 10~30mm. This can make the void ratio larger and have sufficient contact area between aggregate particles to ensure that the concrete has sufficient strength. The content of coarse aggregate needles and flake particles in sand-free macrocellular concrete should not be greater than 15% by mass, and the mud content (including powder content) in the gravel should not be greater than 1%.
Raw materials for cellular concrete
- Cement
Cement should use higher strength ordinary Portland cement and slag Portland cement.
- Coarse aggregate
The aggregate can be gravel, pebbles, or light aggregates such as pumice and ceramsite. The particle size is generally between 5 and 40mm, and a single particle size is usually used. In addition to meeting the strength and crushing index requirements, crushed stone aggregate should not have a total content of needle-like flake particles greater than 15%.
3． Mix water
The mixing water requirements are the same as those for ordinary concrete.
cellular concrete foaming agent
The cellular concrete foaming agent is an additive that can produce foam. Adding foam to cellular concrete can increase the porosity of the concrete and improve its air permeability, water permeability, heat dissipation and other properties.
The main components of cellular concrete foaming agents include surfactants, foaming agents, reinforcing agents, etc., which can produce stable and uniform foam and be compatible with raw materials such as cement and coarse aggregate in concrete to form an integrated body.
When using a cellular concrete foaming agent, it needs to be prepared according to the project needs and used according to the operating steps in the instruction manual. It should be noted that before using a foaming agent, the concrete surface needs to be cleaned to ensure it is dry and smooth. During the use of foaming agents, it is necessary to maintain good ventilation and avoid direct sunlight to prevent adverse effects on the environment and human body.
Advantages of cellular concrete foaming agent
Form a porous structure: cellular concrete foaming agents can produce a large number of independent, uniform foams, which form a stable porous structure in the concrete and increase the air permeability, water permeability and heat dissipation of the concrete.
Improve concrete strength: The reinforcing agents in cellular concrete foaming agents can improve the strength and durability of concrete, giving it better load-bearing capacity and erosion resistance.
Reduce Concrete Weight: Because cellular concrete foaming agents produce lightweight, cellular concrete, use of this additive can reduce the weight of concrete, making it easier to transport and install.
Energy saving and environmental-protection: The raw materials for the production of cellular concrete foaming agents are composed of cement foaming agents, high-efficiency water reducing agents and other admixtures and mineral admixtures. It is non-toxic, pollution-free and does not contain harmful substances such as formaldehyde. It is an environmentally friendly concrete additive.
Improve thermal insulation performance: cellular concrete foaming agents can enhance the thermal insulation performance of concrete, reduce the house’s energy consumption, and improve living comfort.
Reduce noise: cellular concrete foaming agents can reduce noise interference from concrete and improve living quality.
Easy construction: cellular concrete foaming agent is easy to construct and can be constructed by on-site pouring or prefabricated components to improve work efficiency.
Supplier
TRUNNANO is a supplier of cellular concrete foaming agents 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 cellular concrete foaming agents, please feel free to contact us and send an inquiry.