Polycarboxylate Superplasticizer 50%

Enhancing Mechanical Properties
Improves the mechanical properties of concrete by increasing its density as a result of effective water reduction, thereby improving its compressive, flexural, and tensile strength.

Achieving Excellent Plasticizing Performance
Excellent plasticizing performance by effectively blocking the secondary aggregation between cement particles due to steric hindrance of the extended polymer side chains. This gives the polycarboxylate superplasticizer high dispersing ability, which can be maintained for a long time, achieving excellent plasticizing performance of concrete mixtures.

Effectively Improves The Durability Of Concrete
It reduces the alkali-aggregate reaction of concrete and improves its freeze-thaw resistance.

Good Water-Reducing Performance
With low dosage (generally 0.2%-0.3%, equivalent to the mass ratio of dry base to cement), polycarboxylate superplasticizer exhibits excellent water-reducing performance, especially in high-grade concrete (above C50), and the maximum water reduction rate can reach 40%.

Dimensional Stability
The addition of polycarboxylate superplasticizer can effectively improve the shrinkage and creep properties of concrete, resulting in good dimensional stability and reduced the risk of cracking.

Good Early Strength And Enhancement Effect
Under the same conditions, the early strength and enhancement effect of concrete admixtured with polycarboxylate superplasticizer are higher than other types of superplasticizers.

Excellent Water Retention Performance
The bleeding of concrete admixtured with polycarboxylate superplasticizer is significantly lower than that of ordinary concrete, with no segregation, making construction work easier to carry out.

The Influence Of Cement Characteristics
Different types of cement will have an impact on the effect of the water-reducing agent. The mineral composition and chemical composition of the cement clinker and the form of gypsum (as a setting regulator) will all affect the effect of the water-reducing agent. In addition, the fineness of the cement, the type and amount of admixtures in the cement, the freshness of the cement, the moisture content and temperature of the cement, etc. will also affect the effect of the water-reducing agent.

The Influence Of The Characteristics Of The Water-Reducing Agent
Different water-reducing agents have different characteristics and are suitable for concrete of different strengths. When using them, you should choose the appropriate water-reducing agent according to your needs, otherwise, the effect of the water-reducing agent will be affected.

Main Reasons To Make The Polycarboxylate Superplasticizer Less Effective Or Even Invalid
Rainwater Enters The Water-Reducing Agent Tank, Causing The Concentration To Decrease
Cause analysis: The feed port above the water-reducing agent tank was opened and the lid was not closed. Heavy rain and water that may wash the top of the tank flowed into the tank, causing the concentration of the water-reducing agent to drop. Rainwater or flushing water enters the water-reducing agent tank, causing the concentration to decrease, resulting in a low water-reducing rate and a small slump of concrete.

The Water-Reducing Agent Has Poor Homogeneity And The Concrete Partially Retards The Setting.
Cause analysis: The agitator of the water-reducing agent tank is faulty, resulting in uneven density of the water-reducing agent. The density of the water-reducing agent in the lower part of the tank is too high and the condensation time is too long. The concentration in the upper part is too small and the condensation time is short.

Mixing Different Types Of Water Reducing Agents
Cause analysis: Polycarboxylate water-reducing agent and naphthalene-based water-reducing agent are incompatible when mixed, resulting in poor workability of concrete.

Mixing Different Brands Of Water Reducing Agents
Reason analysis: Two waterproofing agents purchased during the same period were used in two projects. One had a significant water-reducing effect, and the other had a smaller water-reducing rate. Workers used the bagged waterproofing agents mixedly when transporting them.

Reasonable Control Of Water Consumption
Polycarboxylate superplasticizers are very sensitive to water consumption, especially when using a higher solids water reducing agent. During the trial and production process, it was found that sometimes the water consumption increased slightly by 1kg to 3kg, and the concrete mixture showed serious bleeding, dew piles, and segregation. Therefore, on the one hand, the water consumption of the single side is strictly controlled on the one hand, and the water content of the sand and gravel is accurately measured. The newly washed sand should be put on hold for a period of time, and then used when the water content is relatively stable. On the other hand, a low-solids polycarboxylate superplasticizer is used to reduce sensitivity.

Use a Reasonable Amount Of Polycarboxylic Acid
During the use process, the appropriate dosage is determined through experiments. When the dosage is low, the concrete has poor sealing ability, the slump loss is fast, the fluidity has deteriorated, and when the dosage is too large, the concrete mixture is likely to cause serious bleeding and segregation. Grab the bottom. Before production, the best combination of concrete water consumption and polycarboxylate water reducer dosage should be tested, that is, the optimal water consumption and admixture dosage, while paying attention to the fluctuation of raw material to polycarboxylate superplasticizer. The impact of quantity. The raw materials used in the project should be used during the test to facilitate production control. If necessary, the on-site construction conditions should be simulated according to the construction requirements.

Dare To Break The Traditional Thinking Mode
In the preparation of high-strength grades, efforts to overcome the use of cement-less mineral admixtures, think that this is safe, the strength will be higher, in fact, the cement is often used to thicken the concrete, the early strength of the concrete develops fast, the growth is slow or not growing in the later period. . Sometimes adding 30kg of cement and concrete without adding cement is about the same, sometimes it is better not to add. Appropriate increase in the amount of mineral admixture will increase the strength of concrete by 5% to 10%, and the strength growth in the later stage is also satisfactory, and it is helpful to reduce hydration heat, prevent cracks, and improve durability.

It Is Strictly Forbidden To Mix Naphthalene Admixtures
Companies that use both naphthalene-based water reducers and polycarboxylate water reducers should, if possible, use sub-station. If the same unit has both polycarboxylic acid and naphthalene, it must be used interchangeably. The admixture weighing container, pipe and mixer are thoroughly cleaned, and the concrete tank car is also cleaned and refilled. It is strictly forbidden to mix naphthalene water reducer and polycarboxylate water reducer. Especially at the construction site, when the method of “second addition of admixture” is needed to adjust the workability of concrete mix, it is necessary to clarify the concrete inside the car. The type of admixture used avoids the “quick setting” of the concrete caused by the mixing, which causes the concrete of the vehicle to be scrapped.

Strengthen Inspection
When the polycarboxylate water reducing agent is purchased, first check various technical indicators of the water reducing agent to ensure the stability of the quality. Secondly, the raw materials used should be selected, and the mixing ratio of the production should be used for testing. If problems are found, the technicians of the admixture production enterprises should be adjusted in time.

Communicate With The Construction Unit In Time
Before the concrete production, the technical requirements of the concrete and the transportation distance, construction technology, temperature of the day, etc. should be known to the construction party. If necessary, go to the working surface for on-site inspection to understand whether the concrete pumping method, the pipeline layout path are reasonable, and the distribution of the steel bars. , the staffing of the construction unit, the quality of the team, etc., according to the actual situation, rational allocation and reasonable dispatch of transport vehicles.

Familiar With The Characteristics Of The Polycarboxylate Superplasticizer Used
Through experiments, the variation rules of polycarboxylate superplasticizer in the trial-construction-production-construction of concrete are summarized, which is convenient for dealing with emergencies. Exploring these laws in the test and production practice, accumulating experience, and when a sudden change in the concrete state occurs, timely propose a reasonable solution to avoid causing greater losses and achieve “timely, scientific and reasonable”.