Water Reducing Type Polycarboxylate Superplasticizer Liquid

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.

Polycarboxylate superplasticizer is a high-performance water reducing agent. It is a cement dispersant used in cement concrete applications. Polycarboxylate concrete superplasticizer is widely used in roads, bridges, dams, tunnels, high-rise buildings and other projects.
According to the structure of the polycarboxylic acid main chain, the polycarboxylic acid series superplasticizer products can be divided into two types. A type of polyether having acrylic acid or methacrylic acid as the main chain and grafting different side chain lengths.
The other type is a polyether having a length of different side chains of maleic anhydride. Based on these two types, a series of high-performance superplasticizer products with different characteristics have been derived.

Because of its relatively low slump loss during use, it is unable to meet the relevant technical requirements, and because of the instability of the composite product, it has an effect on the hardening and durability of the concrete. This weakness is a key factor in inhibiting its development. The sulfamic acid system has a monocyclic aromatic hydrocarbon type structural characteristic. Due to its high water reduction rate, good slump and convenient construction, it is the focus of discussion with the polycarboxylic acid system.

At present, most of the concrete mixing stations are located in the edge areas of the city, so that there is a long distance between concrete production and pouring, which will lead to concrete loss and reduce its pumping function. Causes the same slump loss, including entry materials and weather. Among them, the functions of raw materials are mostly derived from cement, pellet grading, and water reducing agents. Adding a water reducing agent can make the concrete have the advantages of small water-to-gel ratio, less water consumption per unilateral, and less cement.

When the general water reducing agent is adsorbed by the cement particles, it becomes a rigid chain form, and the steric effect cannot be exhibited, and the damage phenomenon cannot be solved. The polycarboxylic acid-based hydroxyl group and the sulfonic acid group anion have an electric repulsion. It has been found that the polypotassium potential of the polycarboxylic acid is not more than that of the naphthalene, and the dispersion effect is better than that of the naphthalene. Further, the ether bond in the polycarboxylic acid and the water molecule are combined to form a hydrogen bond to form a protective film which has a dispersing effect and at the same time stabilizes the cement particles. According to the effect theory, the length of the side chain is proportional to the dispersion effect.

For ordinary concrete mix ratios, the long side chain bond polymer does not exhibit a large water reduction effect. The polycarboxylic acid polymer relies on the electric repulsion between the negative ions and the three-dimensional effect of the side chain. From this point of view, changing the weight between each functional group of the polymer backbone, the length of the main side chain, and the number of connections, after the balance of the structure, can improve the efficiency of water reduction and slump. Polycarboxylate superplasticizer, which adsorbs cement particles, because it has ether bonds, constitutes a relatively thick protective film, making the cement stable. Different types of water reducing agents work differently.

The naphthalene is adsorbed onto the surface of the cement particles, causing electrostatic force between the cement particles. Then the product covers the surface, which weakens the electrostatic force, and the polycarboxylate superplasticizer adheres to On cement, it leads to stronger space resistance between cement particles, so it has higher water reduction performance. In addition, the polycarboxylic acid molecule is a chain structure, and a long side chain is connected to the main chain. When the hydration product covers the surface of the cement particle, the cement particles remain dispersed, so that the naphthalene type water reducing agent is Polycarboxylates can cause less slump loss in concrete. However, polycarboxylates are more sensitive, subtle changes in raw material components, and deterioration in raw material quality have a significant impact on their use.

Using polycarboxylate superplasticizer in concrete is a straightforward process that requires careful attention to detail.

Determine the dosage of polycarboxylate superplasticizer needed for your specific concrete mix. This will depend on factors such as desired workability, slump retention requirements, and ambient conditions. Consult the manufacturer's guidelines or seek advice from experts if necessary.

Next, add the required amount of water to the mixing container before introducing the dry ingredients. It is important to note that polycarboxylate superplasticizers are highly efficient and require less water compared to other plasticizers.

Once the water is added, slowly incorporate the cement and aggregates while continuously mixing. Make sure all materials are well-blended before adding the polycarboxylate superplasticizer.

When it comes time to add the superplasticizer, pour it slowly into the mixture while maintaining constant agitation. This ensures proper dispersion and avoids clumping or uneven distribution within the concrete matrix.

Proceed with placing and finishing your freshly mixed concrete as usual. Pay close attention to its workability during placement and adjust accordingly if necessary by adding more water or adjusting mix proportions within acceptable limits.

In the production process of polycarboxylate superplasticizer, it is necessary to fully understand the various influencing factors of the product performance of polycarboxylate superplasticizer, adjust the synthesis process parameters in time to stabilize the product quality, and strengthen the technical reserve through joint or independent research and development to meet the market demand, which is very important to ensure the stability of the product performance of polycarboxylate superplasticizer.

When the concrete mixed with admixture is tested, the raw materials used in the project shall be used. The testing items shall be determined according to the design and construction requirements. The testing conditions shall be the same as the construction conditions. When the raw materials or concrete performance requirements of the project change, the trial mixing test shall be carried out again.

Avoid contact between polycarboxylate superplasticizer and iron materials: the transportation and storage of polycarboxylate superplasticizer shall not use iron materials (except stainless steel), but should use plastic, glass and other materials. Contact with iron sometimes causes a change in the performance of the polycarboxylate-based water reducer.

First, the compounding of polycarboxylic acid water reducing agent (such as lignosulfonate, air entraining, defoaming, retarding and other components) can only be carried out by admixture manufacturers or suppliers. The users of water reducing agent, that is, concrete preparers, only need to check, accept and put into storage its relevant performance, and shall not compound any other components in it, nor shall other components be mixed into it due to negligence.

Another meaning is that concrete mixing equipment, transport vehicles, pumping equipment is best fixed for concrete mixed with polycarboxylic acid series water reducing agent, when the common mixing equipment, transport vehicles and pumping equipment, these equipment must be thoroughly cleaned before it can be used as concrete mixed with other types of admixture, and vice versa.

Strict metering of water reducing agent and mixing water: when preparing concrete mixture mixed with polycarboxylate water reducing agent, the water reducing agent dosage and water consumption shall be measured strictly according to the optimal water reducing agent dosage and water consumption determined by the laboratory, and the water reducing agent dosage or water consumption shall not be increased at will, so as to avoid adverse phenomena such as segregation, bleeding, hardening, increase of air content of the mixed concrete, which will affect the normal pumping construction and pouring quality of concrete.