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.
1. Excellent plastic retention performance
Because the steric hindrance of the extended polymer side chain effectively hinders the secondary agglomeration between cement particles, so the product has high dispersion performance and can maintain this performance for a long time to realize the excellent plastic retention ability of concrete mixture.
2. Good water reducing rate
The product has good water reducing performance at low content (generally 0.2%-0.3%, equivalent to the mass ratio of dry foundation to cement), especially in high grade concrete (above C50). The maximum water reduction rate can reach 40%.
3. Good early strength and strengthening effect
Under the same conditions, the early strength and strengthening effect of concrete mixed with this product is higher than that of other types of superplasticizer.
4. Can improve the mechanical properties of concrete
Due to its good water-reducing effect and increase the structural compactness of concrete, it can improve the compressive, bending and tensile strength.
5. Can greatly improve the durability of concrete, reduce the alkali-aggregate reaction of concrete, and improve the freeze-thaw resistance of concrete.
6.Dimensional stability
The concrete mixed with this product can effectively improve its shrinkage and creep properties, have good dimensional stability and reduce the risk of cracks.
7. With excellent water retention performance, the concrete mixed with this product has less water secretion and no segregation than the basic product concrete, and it is easier to realize the construction operation.
Concrete Additives Supplier
TRUNNANO is a reliable concrete additives manufacturer with over 12-year experience in nano-building energy conservation and nanotechnology development.
If you are looking for high-quality concrete additives, 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.
Common superplasticizers include lignosulfonates and their derivatives, advanced polyols and polyol complexes, hydroxy carboxylic acids and their salts, polyvinyl ethers and their derivatives, etc. Superplasticizer includes naphthalene sulfonate formaldehyde condensate, polycyclic aromatic hydrocarbon sulfonate formaldehyde condensation polymer, amine sulfonate, melamine sulfonate formaldehyde condensation polymer, etc.
Lignin superplasticizer
Lignin superplasticizer includes calcium lignosulfonate (calcium lignosulfonate), sodium lignosulfonate (sodium lignosulfonate), magnesium lignosulfonate (magnesium lignosulfonate), etc. Among them, wood calcium superplasticizer is widely used.
Wood calcium superplasticizer is based on the waste liquid of sulfite pulp from the production of paper pulp or fiber pulp as raw material and neutralized by lime milk. A brown powder prepared by removing sugar by biological fermentation, evaporating and concentrating, and spray drying. Belongs to the anionic polymer surfactant, the suitable amount of wood calcium superplasticizer is generally 0.2%-0.3% of the cement quality. The water reduction rate is 10%-15%, and the 28-day compressive strength of concrete is increased by 10%-20%. If there is no water reduction, the slump of concrete can be increased by 80% 100mm; if the compressive strength and slump of concrete remain unchanged, the amount of cement can be saved by about 10%. Wood calcium superplasticizer has retarding effect on concrete, and its retarding effect is more significant when it is added too much or at low temperature, and it may also reduce the strength of concrete.
Wood calcium superplasticizer can be used in general concrete projects, especially in large area pouring, slip form construction, pumping concrete and summer construction. Wood calcium superplasticizer should not be used alone in winter construction. When the daily minimum temperature is below 5 ℃, it should be combined with early strength agent or antifreeze. Wood calcium superplasticizer should not be used alone in steam-cured concrete and prestressed concrete to avoid looseness on the surface of steam-cured concrete.
Naphthalene sulfonate superplasticizer
Naphthalene superplasticizer is made from naphthalene or naphthalene homologue by sulfonation and formaldehyde. At present, China mainly produces NNO, NF, FDN, UNF, MF, Jian I and other superplasticizers, most of which are non-air-entraining superplasticizers. It is a water reducer with anthracene superplasticizer, methyl naphthalene superplasticizer, gumarone superplasticizer and coal tar mixture. because its raw materials come from different components of coal tar, it is collectively called coal tar superplasticizer.
The suitable amount of naphthalene superplasticizer is 0.5%-1.0% of the cement quality, the water-reducing rate is 10%-25%, and the 28d strength of concrete is increased by more than 20%. The naphthalene superplasticizer has good water-reducing and strengthening effect and strong adaptability to different kinds of cement. It is suitable for preparing early strength, high strength, flow state and steam curing concrete, but the slump loss is large.
Water soluble resin superplasticizer
This kind of superplasticizer is made from some water-soluble resins, such as melamine resin (melamine superplasticizer) and so on. The strengthening effect of this kind of superplasticizer is remarkable, and it is a superplasticizer. Domestic products include SM resin superplasticizer and so on. The content of SM superplasticizer is 0.5%-2.0% of the cement quality, the water-reducing rate is 15%-27%, and the 3D strength of concrete can be increased by 30%-100%-28d strength by 20%-30%. SM superplasticizer is suitable for preparing high strength concrete, early strength concrete, fluid concrete and steam curing concrete.
Polycarboxylate superplasticizer
Polycarboxylate superplasticizer was produced in the 1980s. Generally speaking, polycarboxylate superplasticizer can be divided into two categories: one is grafting different polyoxyethylene (EO) or polyoxypropylene (PO) branched chains with maleic anhydride as the main chain, and the other is methacrylic acid (EO) or (PO) branched chains.
Concrete Additives Supplier
TRUNNANO is a reliable concrete additives manufacturer with over 12-year experience in nano-building energy conservation and nanotechnology development.
If you are looking for high-quality concrete additives, 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.
Polycarboxylate superplasticizer is often used in concrete, which can reduce the water consumption of concrete while maintaining the same fluidity, thus improving the strength and durability of concrete. It has the function of lubrication, wetting, water reduction and plasticization. it is widely used in roads, bridges, tunnels, dams and other construction projects.
A large number of foams will be found in the process of using polycarboxylic acid superplasticizer, and water-based defoamer can be used to solve the problem.
When selecting polycarboxylate superplasticizer, it is necessary to choose products with good compatibility with all kinds of cement, so that the slump of concrete can be maintained well, the construction time of concrete can be prolonged, and the chloride ion content and alkali content in superplasticizer should be low. this is conducive to the durability of concrete. Polycarboxylic acid superplasticizer has the advantages of low content, high water reduction rate and shrinkage, which can greatly improve the early and later strength of concrete.
In the process of using polycarboxylate superplasticizer, because the stirring operation of the equipment will bring a large amount of air into it, foam will be formed, and these bubbles are mainly large bubbles; polycarboxylate superplasticizer will retain some surface active components that reduce the surface tension in the production process, which has a certain air entraining and foaming characteristics, which will lead to foam production.
These foams need to be eliminated in time. When the foam content in superplasticizer is too high, it will have a certain impact on the structure of concrete, and the existence of air bubbles will reduce the compactness of concrete and affect the strength of concrete structure. Too much foam will also affect the performance and quality of polycarboxylate superplasticizer, resulting in excessive bacteria, mildew, deterioration and odor in superplasticizer. The production of foam will affect the production progress and efficiency of polycarboxylic acid superplasticizer and lead to the increase of production cost.
The water-based defoamer has the ability of rapid defoaming and long-term foam suppression, and can quickly penetrate into the interior of the foam to realize foam breaking and defoaming; and has good chemical stability, and will not affect the performance and quality of polycarboxylic acid superplasticizer after use; it will not change its basic system; it has good water solubility and fast dispersion, can dissolve and uniformly disperse with the superplasticizer, and does not bleach oil or precipitate.
Concrete Additives Supplier
TRUNNANO is a reliable concrete additives manufacturer with over 12-year experience in nano-building energy conservation and nanotechnology development.
If you are looking for high-quality concrete additives, 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.
In the summer when the temperature is high and the air humidity is low, due to the accelerated hydration reaction at high temperature, the moisture is easy to evaporate, the mortar fluidity loss is fast and the setting time is shortened, the construction is difficult, and the mortar is prone to blistering, cracks, uneven and other defects. When the temperature gradually increases, the corresponding water consumption of mortar will increase, which will lead to the decrease of mortar strength. Therefore, in view of the characteristics of summer construction, the following measures should be taken to prevent the occurrence of quality accidents.
First of all, in terms of raw materials, early strength cement will prematurely carry out hydration reaction and consume water, resulting in excessive water consumption in the early stage, which will affect the construction performance of mortar, so we can choose cement that is not early strength for production.
The common admixtures of mortar are stone powder and fly ash, and the microscopic shape of fly ash is honeycomb, which will absorb part of the water and increase the water demand of mortar, and the secondary hydration will also consume part of the water, which will accelerate the water loss of mortar. it is not conducive to the protection of water at high temperature. Stone powder mainly plays a filling role in mortar. Adding appropriate amount of stone powder into mortar can fill the capillary pipe in mortar, protect the moisture in mortar, and reduce water consumption at the same time. An appropriate amount of stone powder admixture will better retain the moisture in the mortar, and the selection of stone powder admixture can better cope with the high temperature in summer.
The gradation of sand has an important influence on the water retention of mortar, which is more important when the temperature is high and moisture is fast. The water retention of natural sand is higher than that of machine-made sand. For the gradation of sand, the sand with fineness modulus of 2.3-2.7 meets the requirements of wet-mixed mortar, especially in summer when the water retention of mortar is high, it is particularly important to select suitable sand.
The proper addition of mortar additives can thicken the water retention of mortar and obviously reduce the shrinkage and deformation of mortar, which can effectively avoid high temperature weather, rapid evaporation of water, uneven defects such as mortar blistering and cracks, and greatly improve the construction efficiency of workers. in order to solve the adverse effects of high temperature in summer.
In addition to adjusting the material of the mortar, it can also be solved by properly improving the consistency of the mortar. If the consistency of the mortar sent the first day is controlled at 90 ±5, it can meet the site requirements well, at the same time, it can improve the water retention performance of the mortar and slow down the moisture emission of the mortar, but this method needs to be verified in the laboratory before it can be put into production.
Concrete Additives Supplier
TRUNNANO is a reliable concrete additives manufacturer with over 12-year experience in nano-building energy conservation and nanotechnology development.
If you are looking for high-quality concrete additives, 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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