What is Naphthalene Superplasticizer?
Naphthalene Superplasticizer is mainly composed of β-naphthalene sulfonic acid formaldehyde high condensate, which has the functions of non-air entraining, superplasticization, efficient water reduction and enhancement.
Naphthalene Superplasticizer has strong adaptability to cement low content. It is easy to use, so it is especially suitable for regular and steam-cured concrete with high efficiency water-reducing and strengthening requirements. It can also be used as the parent material of composite concrete admixture.
Naphthalene Superplasticizers can be widely used in pumping concrete, high-strength precast and prestressed concrete, mass concrete, centrifugal concrete, etc.
Naphthalene Superplasticizer SNF for Concrete Admixture
Technical principle of Naphthalene Superplasticizer
| Solid content, % | 91.87 |
| Sodium sulfate content, % | 18.69 |
| pH | 7.51 |
| Chloride ion content, % | 0.42 |
| surface tension, mN/m | 72 |
| Fluidity of cement paste,mm | 201 |
| Water reduction rate,% | 17.5 |
| Corrosion of steel bar | No |
Features of Superplasticizer Admixtures
1)Naphthalene Superplasticizer has obvious water-reducing and dispersion effects, with a water-reducing rate of 15% and 25%, which can improve the fluidity of cement paste under the condition of low water-cement ratio.
2) Superplasticization can effectively increase the fluidity of concrete and reduce bleeding and segregation, thus improving the workability of concrete, easy construction and easy compaction.
3) The enhancement effect is good
Under the condition of the same amount of cementitious material per unit, the 1D, 3D, 7d, 28d and 90d compressive strength of concrete mixed with superplasticizer can generally increase by 60%, 50%, 40% and 41% compared with the standard concrete in the same period.
4) The product has strong adaptability
The product is suitable for various specifications and types of cement and is compatible with admixtures such as expansive agents, air entraining agents and active admixtures such as fly ash. It has good adaptability, functions complement and excite each other, and can improve concrete's main physical and mechanical properties in an all-around way. The compactness, water resistance and wear resistance of concrete are greatly improved.
Non-toxic, non-irritating and radioactive, does not contain substances dangerous to rust steel bars; non-flammable, explosive, non-dangerous goods.
Usage and points for attention:
1) Dosage: the range of content of this product is powder 0.3% mi 1.5%, commonly used content is 0.5-1.0%.
The amount of liquid added is converted according to the actual concentration of the liquid, which can provide a liquid concentration range of 30% to 40%.
Under normal conditions, the shelf life of powder is three years, and that of aqueous agent is one year. Physical tests should be carried out again beyond the shelf life.
FAQs of Superplasticizer Admixtures
Q: What should I pay attention to when using SNF to ensure optimal performance?
A: In order to ensure the best performance of SNF, the following points should be noted during use: Correct dosage: Add SNF in strict accordance with the manufacturer's recommended proportions, as too much may lead to over-plasticization or delayed solidification, while not enough will not achieve the desired results. Homogeneous mixing: Ensure that SNF is fully dissolved in water and thoroughly mixed with all dry ingredients to avoid localized over-concentration or inefficient distribution. Suitability testing: Different brands and batches of cement may respond differently to SNF, so laboratory tests are recommended to determine the optimum ratio. Control of environmental conditions: Pay attention to the effect of construction ambient temperature, extreme high or low temperatures may change the behavior of SNF; adjust the proportion or other additives if necessary. Compatibility with other admixtures: When used in combination with other types of admixtures such as expanders, air-entraining agents, etc., the compatibility between them needs to be verified to prevent adverse reactions from affecting the overall performance.
Q: How does SNF affect the long-term performance and durability of concrete?
A: SNFs have a positive effect on the long-term performance and durability of concrete by improving its internal structure: Increased densification: As a result of the reduction of excess water, the concrete forms fewer pores after hardening and has a denser structure, which reduces the possibility of intrusion of harmful substances from outside. Increased impermeability: A good pore structure reduces the opportunity for water and other liquids to penetrate, which is particularly important for structures and marine works. Resistance to freeze-thaw cycles: Lower porosity means that there is limited space for ice crystals to form, thus mitigating damage caused by repeated freezing and thawing. Resistance to chemical corrosion: The closed pore network effectively blocks the intrusion of corrosive media such as sulfates and chloride ions, protecting the reinforcement from the threat of corrosion. Abrasion resistance and compressive strength: The optimized microstructure improves the hardness and overall mechanical properties of the concrete surface, making it more suitable to withstand heavy traffic and industrial applications.
Q: What are the potential environmental impacts of SNF? What measures should be taken to mitigate these impacts?
A: Although SNF itself is a relatively environmentally friendly material, its environmental impacts during production and use need to be looked at and measures taken: Emission management during production: Ensure that producers follow strict standards for waste gas and water treatment to minimize the release of hazardous substances into the atmosphere and water bodies. Safety protection during construction: Properly store SNF and its solution at the construction site to prevent leakage and contamination of soil and water; workers should wear appropriate personal protective equipment to avoid direct contact with skin or inhalation of dust. Waste disposal: Unused SNF or waste concrete containing SNF should be recycled or disposed of safely in accordance with local regulations and should not be discarded. Ecotoxicity assessment: Although current studies show that SNF is less harmful to the ecosystem, there is still a need for continuous monitoring of its long-term effects, especially in aquatic environments. Research on alternatives: Encourage the development of new green and efficient water reducing agents to further minimize any possible negative impacts of traditional SNF.
Q: How to select the right type of SNF and supplier for a particular project?
A: Selecting the SNF type and reliable supplier that best suits the needs of the project is a critical step in ensuring the quality and cost-effectiveness of the concrete: Understand the project requirements: Start by identifying the specific needs of the project, such as the required slump, strength class, method of construction, and any special environmental or regulatory constraints. Compare technical specifications: Compare the technical specifications of different SNF models, such as water reduction, plasticizing time, pH range, etc., and select the product that best meets the requirements. Sample testing: Request samples from potential suppliers and conduct laboratory tests and small-scale trials to assess whether their actual performance meets expectations. Supplier reputation: Examine suppliers' historical performance, customer evaluations and service levels, and prioritize those with good reputation and support capabilities. Price and supply stability: Consider the market price of the product, volume discount policy and the reliability of long-term supply to find the most cost-effective partner. Technical support: choose suppliers that can provide detailed technical support and solutions, so that when encountering technical problems can be timely and effective help.
