Water Reducing Polycarboxylate Superplasticizer 50%

Zibo Zhuoxing Enterprises Co., Ltd was founded in 2008. Zibo Zhuoxing Enterprises Co., Ltd is the international trade company of Shandong Zhuoxing Chemical, has begun to export TPEG, HPEG, EPEG,Polycarboxylate superplasticizer liquid with 50% content and Polycarboxylate superplasticizer powder to many countries since 2015.

Water Reducing Polycarboxylate Superplasticizer 50% has the characteristics of high water reducing rate, small slump loss, and environmental protection. It is a high-performance water reducing agent. and other fields are widely used.
Water Reducing Polycarboxylate Superplasticizer 50% has excellent performance and has been widely recognized by the market. However, as the third generation of water reducer, the molecular structure and principle of action of Water Reducing Polycarboxylate Superplasticizer 50% are quite different from those of the previous two generations.

Polycarboxylate superplasticizer, also known as PCE, are a class of chemical admixtures commonly used in the construction industry. They are designed to improve the ease and flow of concrete while reducing the water content. This will improve the strength and durability of the concrete structure.

There are different types of polycarboxylate superplasticizer available in the market today. One common type is the traditional polycarboxylate high efficiency (PCE) water reducer. This type has excellent water reducing capacity and is suitable for a variety of applications such as high strength concrete or self-compacting concrete.

Another type is the modified polycarboxylate high efficiency water reducer, which contains additional modifiers to enhance specific properties such as early strength development or extended make-up time. This makes them ideal for applications that require fast set-up or extended working times.

The third type is a retarded coalescing carboxylic acid water reducer, which delays the setting time of concrete. It allows for a better surface finish and reduces cracking by extending the time before initial setting.

There are also special types of polycarboxylate superplasticizer with unique properties such as air entrapment or corrosion inhibition properties. These variants are available to meet specific construction needs and requirements.

Water Reducing Polycarboxylate Superplasticizer 50% (PCEs) find widespread applications in the construction industry due to their ability to enhance the performance and workability of concrete and other cement-based materials.

Precast Concrete: PCEs enhance the workability of concrete used in precast applications, allowing for easy molding of intricate shapes and detailed surface finishes. Precast elements like panels, beams, and columns benefit from the improved flow and reduced water content provided by PCEs.

Ready-Mix Concrete: PCEs are widely used in ready-mix concrete plants to produce concrete mixes that can be transported to construction sites and poured directly. The improved workability and slump retention properties of PCEs are crucial for maintaining concrete quality during transit and placement.

Shotcrete: PCEs are employed in shotcrete applications (sprayed concrete) where high fluidity and good cohesion are required. Shotcrete is commonly used for repairing and retures, particularly in tunneling and slope stabilization projects.

Mass Concrete: PCEs help reduce the heat of hydration in large concrete pours, making them suitable for mass concrete applications like dams, foundations, and retaining walls. Controlling the heat of hydration is essential to prevent thermal cracking in massive concrete structures.

High-Performance Concrete: PCEs are a key ingredient in high-performance concrete formulations, which exhibit exceptional strength, durability, and resistance to environmental factors. These concrete mixes are often used in demanding applications like industrial floors, parking structures, and high-traffic pavements.

Water Reducing Polycarboxylate Superplasticizer 50% are a new type of water reducer with many outstanding advantages, but their mechanism of action is not fully understood yet.

● Retardation effect, mainly because the carboxyl groups act as retardation components. R-COO～ interacts with Ca2+ ions to form complexes, reducing the concentration of Ca2+ ions in the solution, delaying the formation of Ca(OH)2 crystals, reducing the formation of C-H-S gel, and delaying cement hydration.

● The polar groups with strong affinity to water, such as carboxyl (-COOH), hydroxyl (-OH), amino (-NH2), and polyalkylene (-O-R)n, mainly provide dispersion and fluidity to cement particles through adsorption, dispersion, wetting, and lubrication actions. They reduce the frictional resistance between cement particles, lower the free energy of the cement-water interface, and increase the workability of fresh concrete. Polycarboxylate substances adsorbed on the surface of cement particles impart negative charges to cement particles, causing electrostatic repulsion between cement particles and dispersing them, leading to inhibited aggregation of cement paste (DLVO theory), increasing the contact area between cement particles and water, and ensuring full hydration of cement. During the dispersion of cement particles, free water locked by aggregates is released, improving workability and reducing the amount of mixing water.

● Steric hindrance effect. Polycarboxylate molecules adsorbed on the surface of cement particles form a "comb-like" structure, creating an adsorption layer on the surface of gel materials. When polymer molecular adsorption layers approach and intersect, physical steric hindrance occurs between polymer chains, preventing cement particle aggregation. This is an important reason why carboxylic acid superplasticizers have stronger dispersing capabilities compared to other systems.

● The mechanism of maintaining dispersion of Water Reducing Polycarboxylate Superplasticizer 50% can be understood from the relationship between time after mixing cement paste and Zeta potential. Generally, concrete using naphthalene and melamine-based superplasticizers experiences significant slump loss after 60min compared to concrete containing Water Reducing Polycarboxylate Superplasticizer 50%. This is mainly due to different adsorption models between the latter and cement particles, where the force between polymer adsorption layers is steric electrostatic repulsion, resulting in minor changes in Zeta potential.

In recent years, the synthesis technology of polycarboxylic acid mother liquor has become more and more mature through several update iterations, from the high-temperature esterification process that must use pure water to the tap water normal temperature method. Greatly lowered the synthesis threshold of Water Reducing Polycarboxylate Superplasticizer 50%. Most of the mother liquors on the market have similar properties, providing a relatively common communication basis for the compounding technology.

Mother Liquor
The most commonly used mother liquors are water-reducing mother liquor and slump-preserving mother liquor. Some people in the market are used to calling the slump-preserving mother liquor as the slump-preserving agent. There is a big difference between the slump-preserving mother liquor and the water-reducing mother liquor, but the synthesis method is the same only the synthetic raw materials are different. The slump-preserving mother liquor is more standardized in the division of compound raw materials.
The polycarboxylic acid mother liquor can increase the water reducing rate by adjusting the ratio of acrylic acid to macromonomer, but the slump retention performance of the mother liquor will be sacrificed. Between improving the water reducing rate to highlight the cost performance and improving the slump performance to ensure the use effect, the performance of the water reducing mother liquor on the market is basically the same.

Defoamer air-entraining agent
A certain amount of air-entraining agent in concrete is very beneficial to improve the fluidity, workability and pumpability of concrete, reduce segregation and bleeding of the mixture, and improve the uniformity and durability of concrete. However, the amount of air-entraining agent should not be too high. Excessive air content will increase the compressibility of the air and produce an unsaturated state, which will increase the pump pressure loss during pumping. In the process of updating and iterating the Water Reducing Polycarboxylate Superplasticizer 50%, the types of air-entraining agent and defoamer are even more complicated than the mother liquor. The defoamer is used to reduce the air content of concrete and eliminate large air bubbles that are not conducive to concrete. The dosage is generally about three ten thousandths.

Water retaining agent
When the workability of concrete cannot be completely improved by the above materials, water retaining agents such as cellulose ether, polyacrylamide, and Wenlun glue can be considered to improve the workability of concrete. In commercial concrete, the application of water retaining agent is seldom. Too much water retaining agent will affect the slump retention effect of concrete. Affecting the slump retention effect is a disguised increase in the compounding cost of the water reducer. The dosage of cellulose ether is less than 3/10,000.

Antifreeze early strength agent
Various inorganic salts have antifreeze effect, commonly used antifreeze agents are sodium nitrite, sodium nitrate, calcium nitrate and so on. Sodium chloride has the lowest price, and chloride ions have the side effect of corroding steel bars. In order to reduce the compounding cost of Water Reducing Polycarboxylate Superplasticizer 50%, some admixture manufacturers combine sodium nitrite and sodium chloride, which have antirust effects. Antifreeze also has early strength effect. In addition, triethanolamine can be used to improve the early strength of concrete.