Concrete Admixtures

Concrete admixtures refer to some materials added before or during the mixing process of concrete to improve the performance of new mixed concrete or hardened concrete. These admixtures are added to concrete in small amounts, usually no more than 5% of the mass of cement, to significantly improve the workability, strength, durability or adjust the setting time of concrete. At the same time, the use of concrete admixtures also helps save cement, improve construction efficiency, and meet different engineering needs.

In concrete engineering, the rational use of admixtures can significantly improve engineering quality, reduce costs and meet different engineering needs. Therefore, when selecting and applying concrete admixtures, the appropriate type of concrete admixture should be selected according to the characteristics and requirements of the project to ensure the best engineering effect.

Buy Various Types of Concrete Admixtures From Kingsun

As a leading concrete admixtures manufacturer and supplier in China, Kingsun concrete admixtures for sale mainly include Sodium Gluconate 98% min, Sodium Naphthalene Sulfonate(SNF/PNS/FND), Polycarboxylate Superplasticizer(PCE), Sodium Lignosulfonate, Calcium Lignosulfonate. Although they all belong to the popular construction chemicals, they have different functions and uses in construction industry. Please view the detailed introduction of these products.

As a concrete retarder, Kingsun sodium gluconate 98% min can delay the Initial and final setting time of concrete. In general, it can extend the concrete setting time by a few days without effect the strength of the concrete. Of course, it can also act as a water reducing admixture to improve the workability and the strength of concrete.

ItemSodium Gluconate (CAS 527-07-1)
AppearanceWhite crystalline powder
Purity %98 Min
Loss on drying %0.50 Max
Sulphate (SO42-) %0.05 Max
Chloride (Cl) %0.07 Max
Heavy metals (Pb) ppm10 Max
Reduzate (D-glucose) %0.7 Max
PH (10% water solution)6.2~7.5
Arsenic salt(As) ppm2max
Packing & Loading25 kg/PP bag, 26tons in 20’FCL without pallets;
1000kg/Jumbo bag on pallet, 20MT in 20’FCL;
1150kg/Jumbo bag on pallet, 23MT in 20’FCL;

Sodium lignosulfonate has adsorption and dispersion effects on cement and can improve various physical properties of concrete. Adding sodium lignosulphonate to concrete can reduce water consumption by more than 13%, improve the workability of concrete, and can greatly reduce the heat of hydration in the early stage of cement hydration. In addition, it can also be compounded with other admixtures into early strength agents, retarders, antifreeze, pumping agent, etc.

ItemsSodium Lignosulfonate
AppearanceYellow Brown Powder
Dry Matter %92 min
Lignosulphonate %60 min
Moisture %7 max
Water insoluble matter %0.5 max
Sulphate (as Na2SO4) %4 max
PH Value7.5-10.5
Content of Ca and Mg %0.4 max
Total reducing matter %4 max
Content of Fe %0.1 max
PackingNet 25kg PP bags; 550kg jumbo bags;

As a kind of ordinary water reducing agent for concrete, calcium lignosulfonate can improve the workability of concrete and improve the quality of the project. It can be used in summer to suppress slump loss, and it is generally used in combination with superplasticizers.

Index itemsStandard valueTest Results
AppearanceBrown powderMeets the requirement
PH value8–108.2
Dry matter≥92%95
Inorganic salts(Na2SO4≤5.0%2.3
Total reducing matter≤6.0%4.7
Water insoluble matter≤4.0%3.67
Calcium magnesium general quantity≤1.0%0.78

Sodium naphthalene sulfonate (SNF) has characteristics like a high water-reducing rate and little effect on the concrete setting time. The water-reducing rate of naphthalene superplasticizer can reach 15%-25%. Besides, SNF superplasticizer can also improve the early strength and workability of concrete.

Solid Content (%) ≥929292
PH Value7-97-97-9
Na2SO4 Content (%)≤51018
Chlorine Content (%)≤
Net Starch Fluidity(mm)≥250240230
Max Water Reducing Rate(%)262523
Packing of SNF Superplasticizer25kg pp bag; 650kg Jumbo bag. Customized package available.

As a new generation of high-efficiency concrete water reducer, Kingsun polycarboxylate superplasticizer (PCE) has a high water reduction rate with a low dosage. Its water reduction rate can be as high as 45%. It is often used to prepare high-strength and high-performance concrete. The concrete prepared with polycarboxylate ether has good performance. Even under the condition of a high slump, there will be no obvious segregation and bleeding phenomenon in concrete.

ItemsPolycarboxylate Superplasticizer
PCE (High Water Reduction)PCE (High Slump Retention)PCE Powder
AppearanceLight Yellow LiquidClear Transparent LiquidWhite Powder
Solid Content, %50±1.050±1.098±1.0
Density (23℃) (kg/m3)1.13±0.021.05-1.10600±50
Chloride Content,% ≤
Na2SO4 (by solid content), % ≤
SolubilityCompletely Soluble
Water reducing ratio, % ≥25
Packing of PCE Based SuperplasticizerFor PCE liquid, the packing is 230kg PE drum, 1100kg IBC tank or flexitank. For PCE Powder, the packing is 25 kg PP woven bags.

Main functions of concrete additives

The functions of concrete admixtures are mainly reflected in improving the performance, workability, strength, durability and working performance of concrete to meet the requirements of different projects for concrete performance. However, when using admixtures, it is also necessary to select and proportion them according to the specific situation and project requirements to ensure their effectiveness and safety.

  • Improve the construction performance of concrete. By reducing the amount of water used in concrete, or increasing the fluidity of concrete without increasing the amount of water used, concrete is made easier to construct and pump.
  • Adjust the setting time. According to the needs of the project, admixtures can adjust the setting time of concrete, so as to better control the construction progress and the performance of concrete.
  • Enhance the strength and durability of concrete. By improving the early and late strength of concrete, increasing its frost resistance, impermeability, abrasion resistance and corrosion resistance, the durability and safety of concrete structures can be improved.
  • Control the deformation and cracking of concrete. By reducing the shrinkage and water segregation of concrete, delaying the initial hydration heat, and reducing the temperature rise rate of large-volume concrete, the occurrence of cracks can be reduced and the volume stability of concrete can be improved.
  • Improve the working performance of concrete. Some special admixtures, such as fly ash admixtures, can also improve the working performance of concrete and reduce the thermal and dry shrinkage deformation of concrete.

In general, concrete admixtures are an indispensable part of concrete engineering. Through the rational use of additives, the quality of the project can be significantly improved, the cost can be reduced, and different engineering requirements can be met. At the same time, with the continuous development of construction technology, the types and performance of concrete admixtures are also constantly updated and improved, providing more choices and possibilities for concrete engineering.

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