How to solve the problem of polycarboxylate superplasticizer and cement incompatibility

Generally, the adaptability of polycarboxylic acid and cement is still good, but the mud content of coarse aggregate has a great impact on polycarboxylic acid, if the sand and gravel you use have not changed, it may also be that there is a problem with the polycarboxylic acid stock solution. I have seen a lot of polycarboxylic acid stock solution produced with very bad slump preservation, so wouldn't it be difficult for you to use it to compound! The slump retention of good polycarboxylic acid is much better than that of naphthalene!

You have 220 initially, but 1 hour is gone, and the loss is too great. Add some plasticizer to try, polycarboxylic acid manufacturers will provide! If you still can't solve it, you can only change cement, or admixtures!

You go from 220 to no slump, this situation cannot be solved by compounding!

There are many factors that lead to the loss of concrete slump, such as cement adaptability problems, sand and gravel mud problems, temperature, admixture, etc.

If it is confirmed that the slump is lost too quickly due to cement adaptability, the polycarboxylic acid can be compounded accordingly according to the cement characteristics.

Compound retarding excipients is one of the solutions, and you can try to start with the masterbatch itself, such as the mother liquor with partial sustained release function.

Otherwise, it may be that other materials and admixtures are not adaptable, such as the mud content of the sand is too large, or some light substances in the sand, chemical substances, etc. have an impact on the admixtures, and we have encountered this kind of situation on the construction site.

Polycarboxypure permeable acid superplasticizer is a commonly used additive in concrete, which can reduce the amount of cement and improve the fluidity of concrete. However, if the polycarboxylate superplasticizer is used too much or is not compatible with other additives, it may become viscous in concrete.

The main reason is that the polycarboxylate superplasticizer molecule contains a large number of carboxynavol groups, which can adsorb the surface of cement particles to form a negatively charged surfactant layer, so that the electrostatic repulsion between cement particles is reduced, thereby increasing the fluidity of concrete. However, if too much polycarboxylate superplasticizer is used, these carboxyl groups will attract each other to form a tighter adsorption layer, resulting in an increased viscosity of the concrete.

In addition, if the polycarboxylate superplasticizer is not compatible with other additives, viscosity may also occur. For example, if both a retarder and a polycarboxylate superplasticizer are added to the concrete, viscosity may occur because the retarder inhibits the hardening reaction of the cement, making the polycarboxylate superplasticizer unable to exert its normal water-reducing effect.

Therefore, when using polycarboxylate superplasticizer, the appropriate dosage should be selected and mixed with other additives should be avoided to avoid the problem of concrete viscosity.

The main functions are as follows:

The function of the superplasticizer is to improve the working degree of the fresh concrete, improve the fluidity of the concrete without reducing the cement and water consumption, reduce the cement and water consumption to improve the strength of the concrete under the condition of maintaining the workability, and reduce the cement consumption per unit volume of concrete and save cement under the condition of ensuring a certain strength; Improve the pumpability of concrete mixtures and other physical and mechanical properties of concrete. The superplasticizer has adsorption and dispersion effect, as well as lubrication effect, and the polycarboxylic acid high-performance superplasticizer has the following advantages compared with other types of admixtures:

1.The ground parameters are abundant and the dispersion is good.

2.The loss of slump is small, and there is basically no loss of slump within 90min3At the same fluidity, the setting of cement can be delayed.

4.The molecular structure is large, the manufacturing technology can control many parameters, and the high performance potential is great;

5.Formaldehyde is not used in synthesis, so it does not cause pollution to the environment6Good compatibility with cement and other kinds of admixtures.

Polycarboxylic acid high-performance superplasticizer has a high water reduction rate, which can reduce the water consumption of concrete and save cement. In addition, the application of this superplasticizer can reduce the collapse loss of concrete, keep the concrete with a good fluidity, and be suitable for the configuration of high-strength concrete.

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Summary. First of all, avoid long-term contact with iron materials in the process of use, because polycarboxylate superplasticizer is acidic, if it is in long-term contact with iron materials, it may react slowly, and sometimes it will cause changes in the performance of polycarboxylate superplasticizer, if you store polycarboxylate superplasticizer in metal containers, it is best not to exceed half a year. Secondly, when using, it is necessary to strictly calculate the water reducer and mixing water, and the water consumption should be strictly determined by the laboratory, and the water consumption should not be increased and decreased at will, so as not to appear undesirable phenomena and affect the normal construction and pouring quality of concrete.

Thirdly, in the process of using polycarboxylate superplasticizer, the effect on the drying and shrinkage performance of concrete is relatively small, but this does not mean that the concrete mixed with polycarboxylate superplasticizer can not be cured, and the maintenance in the early stage should be strengthened to prevent cracking. Polycarboxylate superplasticizer is a high-efficiency superplasticizer, which can be used in ready-mixed and precast concrete in the process of use, which can effectively reduce the shrinkage of concrete and improve the durability of concrete in the process of use. The above points are the precautions for polycarboxylate superplasticizer, I hope it can help you!

First of all, avoid long-term contact with iron materials in the process of use, because polycarboxylate superplasticizer is acidic, if it is in long-term contact with iron materials, it may react slowly, and sometimes it will cause changes in the performance of polycarboxylate superplasticizer, if you store polycarboxylate superplasticizer in metal containers, it is best not to exceed half a year. Secondly, when using, it is necessary to strictly calculate the water reducer and mixing water, and the water consumption should be strictly determined by the laboratory, and the water consumption should not be increased and decreased at will, so as not to appear undesirable phenomena and affect the normal construction and pouring quality of concrete. Thirdly, in the process of using polycarboxylate superplasticizer, the effect on the drying and shrinkage performance of concrete is relatively small, but this does not mean that the concrete mixed with polycarboxylate superplasticizer can not be cured, and the maintenance in the early stage should be strengthened to prevent cracking.

Polycarboxylate superplasticizer is a high-efficiency superplasticizer, which can be used in ready-mixed and precast concrete in the process of use, which can effectively reduce the shrinkage of concrete and improve the durability of concrete in the process of use. The above points are the precautions for polycarboxylate superplasticizer, I hope it can help you!

First of all, the function of the superplasticizer is to ensure that the amount of cement remains unchanged, and the amount of cement is reduced by reducing the amount of water or water-cement ratio. Polycarboxylic acid high-performance superplasticizer is a kind of superplasticizer, and the water reduction rate is usually required to reach more than 25%.

What is added to the polycarboxylate superplasticizer to make it ineffective, but the color will not change?

Hello, in order to make the polycarboxylate superplasticizer ineffective, you can add substances containing cations, such as ammonium sulfate, ferrous sulfate, etc. These cations will interact with the negative ions in the polycarboxylic acid molecule, resulting in a reduced or even ineffective water reduction effect, but the color will not change significantly. It should be noted that the polycarboxylate superplasticizer should be stored in a cool, dry, ventilated and good place to avoid moisture and deterioration.

When using, it should be used in accordance with the instructions and avoid excessive use or mixing with other incompatible chemicals. The above comments are for your reference.

Summary. Hello, polycarboxylate superplasticizer is a concrete admixture, which can reduce its cement dosage, increase strength, improve engineering performance, etc. by changing the physical and chemical properties of concrete. Whereas, defoamer is a chemical that prevents bubbles and foam from appearing on the surface of concrete, and its main role is to reduce the air content in concrete and improve the compactness of concrete.

When using polycarboxylate superplasticizers, a small amount of defoamer is sometimes added to prevent bubbles and foam on the surface of the concrete and to improve the appearance quality of the concrete. However, defoamers can only act on the air bubbles generated on the surface and cannot affect the air content in the concrete body. Therefore, when using polycarboxylate superplasticizers, the air content of concrete can still be high, even if a defoamer is added.

The high air content of concrete may be related to a variety of factors, such as material selection, construction operations, environmental conditions, etc., which need to be analyzed and controlled according to the specific situation. In order to reduce the air content of concrete, some measures can be taken, such as controlling the water-cement ratio, concrete mixing time, vibration compaction, etc., to ensure the quality and performance of concrete. The above is for your reference I wish you a happy life!

All the best! Why is a defoamer added to the polycarboxylate superplasticizer, the air content of concrete is still very high.

Hello, polycarboxylate superplasticizer is a concrete admixture, which can reduce its cement dosage, increase strength, and improve engineering performance by changing the physical and chemical properties of concrete. Whereas, defoamer is a chemical that prevents bubbles and foam from appearing on the surface of concrete, and its main role is to reduce the air content in concrete and improve the compactness of concrete. When using polycarboxylate superplasticizers, a small amount of defoamer is sometimes added to prevent bubbles and foam on the surface of the concrete and to improve the appearance quality of the concrete.

However, defoamers can only act on the air bubbles generated on the surface, but cannot affect the amount of gas in the concrete. Therefore, when using polycarboxylate superplasticizers, the air content of concrete can still be high, even if a defoamer is added. The high air content of concrete may be related to a variety of factors, such as material selection, construction operations, environmental conditions, etc., which need to be analyzed and controlled according to the specific situation.

In order to reduce the air content of concrete socks, some measures can be taken, such as controlling the water-cement ratio, concrete mixing time, vibration compaction, etc., to ensure the quality and performance of concrete. The above is for your reference I wish you a happy life! All the best!

How to eliminate the air content inside concrete?

The following measures can be taken: control the water-cement ratio: by reasonably controlling the amount of water and cement in the coagulated old soil, the air content of the concrete can be reduced.

Air bubbles and voids on the concrete surface can be eliminated by strengthening vibratory compaction. Reduce the conveying distance: shorten the distance of concrete conveying as much as possible to avoid vibration and vibration of concrete during the conveying process.

Use admixtures: Admixtures such as polycarboxylate superplasticizers and defoamers can help improve the performance and quality of concrete, reducing the air content inside the concrete.